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@@ -1,2411 +0,0 @@
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-/* POSIX.2 wordexp implementation.
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- Copyright (C) 1997, 1998, 1999 Free Software Foundation, Inc.
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- This file is part of the GNU C Library.
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- Contributed by Tim Waugh <tim@cyberelk.demon.co.uk>.
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-
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- The GNU C Library is free software; you can redistribute it and/or
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- modify it under the terms of the GNU Library General Public License as
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- published by the Free Software Foundation; either version 2 of the
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- License, or (at your option) any later version.
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-
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- The GNU C Library is distributed in the hope that it will be useful,
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- but WITHOUT ANY WARRANTY; without even the implied warranty of
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- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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- Library General Public License for more details.
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-
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- You should have received a copy of the GNU Library General Public
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- License along with the GNU C Library; see the file COPYING.LIB. If not,
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- write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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- Boston, MA 02111-1307, USA. */
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-
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-#include <wordexp.h>
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-#include <signal.h>
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-#include <stdlib.h>
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-#include <pwd.h>
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-#include <sys/types.h>
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-#include <string.h>
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-#include <glob.h>
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-#include <ctype.h>
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-#include <sys/time.h>
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-#include <sys/types.h>
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-#include <sys/wait.h>
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-#include <unistd.h>
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-#include <fcntl.h>
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-#include <sys/stat.h>
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-#include <paths.h>
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-#include <errno.h>
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-#include <sys/param.h>
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-#include <stdio.h>
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-#include <fnmatch.h>
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-
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-/* Undefine the following line for the production version. */
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-/* #define NDEBUG 1 */
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-#include <assert.h>
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-
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-/*
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- * This is a recursive-descent-style word expansion routine.
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- */
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-
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-/* These variables are defined and initialized in the startup code. */
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-extern int __libc_argc;
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-extern char **__libc_argv;
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-
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-/* Some forward declarations */
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-static int parse_dollars (char **word, size_t *word_length, size_t *max_length,
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- const char *words, size_t *offset, int flags,
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- wordexp_t *pwordexp, const char *ifs,
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- const char *ifs_white, int quoted);
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-static int parse_backtick (char **word, size_t *word_length,
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- size_t *max_length, const char *words,
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- size_t *offset, int flags, wordexp_t *pwordexp,
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- const char *ifs, const char *ifs_white);
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-static int parse_dquote (char **word, size_t *word_length, size_t *max_length,
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- const char *words, size_t *offset, int flags,
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- wordexp_t *pwordexp, const char *ifs,
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- const char *ifs_white);
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-static int eval_expr (char *expr, long int *result);
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-
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-/* The w_*() functions manipulate word lists. */
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-
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-#define W_CHUNK (100)
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-
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-/* Result of w_newword will be ignored if it's the last word. */
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-static inline char *
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-w_newword (size_t *actlen, size_t *maxlen)
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-{
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- *actlen = *maxlen = 0;
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- return NULL;
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-}
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-
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-static inline char *
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-w_addchar (char *buffer, size_t *actlen, size_t *maxlen, char ch)
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- /* (lengths exclude trailing zero) */
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-{
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- /* Add a character to the buffer, allocating room for it if needed.
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- */
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-
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- if (*actlen == *maxlen)
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- {
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- char *old_buffer = buffer;
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- assert (buffer == NULL || *maxlen != 0);
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- *maxlen += W_CHUNK;
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- buffer = realloc (buffer, 1 + *maxlen);
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-
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- if (buffer == NULL)
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- free (old_buffer);
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- }
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-
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- if (buffer != NULL)
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- {
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- buffer[*actlen] = ch;
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- buffer[++(*actlen)] = '\0';
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- }
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-
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- return buffer;
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-}
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-
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-static char *
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-w_addmem (char *buffer, size_t *actlen, size_t *maxlen, const char *str,
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- size_t len)
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-{
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- /* Add a string to the buffer, allocating room for it if needed.
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- */
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- if (*actlen + len > *maxlen)
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- {
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- char *old_buffer = buffer;
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- assert (buffer == NULL || *maxlen != 0);
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- *maxlen += MAX (2 * len, W_CHUNK);
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- buffer = realloc (old_buffer, 1 + *maxlen);
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-
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- if (buffer == NULL)
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- free (old_buffer);
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- }
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-
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- if (buffer != NULL)
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- {
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- *((char *) mempcpy (&buffer[*actlen], str, len)) = '\0';
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- *actlen += len;
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- }
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-
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- return buffer;
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-}
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-
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-static char *
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-w_addstr (char *buffer, size_t *actlen, size_t *maxlen, const char *str)
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- /* (lengths exclude trailing zero) */
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-{
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- /* Add a string to the buffer, allocating room for it if needed.
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- */
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- size_t len;
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-
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- assert (str != NULL); /* w_addstr only called from this file */
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- len = strlen (str);
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-
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- return w_addmem (buffer, actlen, maxlen, str, len);
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-}
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-
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-static int
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-w_addword (wordexp_t *pwordexp, char *word)
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-{
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- /* Add a word to the wordlist */
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- size_t num_p;
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- char **new_wordv;
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-
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- /* Internally, NULL acts like "". Convert NULLs to "" before
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- * the caller sees them.
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- */
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- if (word == NULL)
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- {
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- word = strdup ("");
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- if (word == NULL)
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- goto no_space;
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- }
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-
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- num_p = 2 + pwordexp->we_wordc + pwordexp->we_offs;
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- new_wordv = realloc (pwordexp->we_wordv, sizeof (char *) * num_p);
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- if (new_wordv != NULL)
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- {
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- pwordexp->we_wordv = new_wordv;
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- pwordexp->we_wordv[pwordexp->we_offs + pwordexp->we_wordc++] = word;
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- pwordexp->we_wordv[pwordexp->we_offs + pwordexp->we_wordc] = NULL;
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- return 0;
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- }
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-
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-no_space:
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- return WRDE_NOSPACE;
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-}
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-
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-/* The parse_*() functions should leave *offset being the offset in 'words'
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- * to the last character processed.
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- */
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-
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-static int
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-parse_backslash (char **word, size_t *word_length, size_t *max_length,
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- const char *words, size_t *offset)
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-{
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- /* We are poised _at_ a backslash, not in quotes */
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-
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- switch (words[1 + *offset])
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- {
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- case 0:
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- /* Backslash is last character of input words */
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- return WRDE_SYNTAX;
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-
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- case '\n':
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- ++(*offset);
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- break;
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-
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- default:
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- *word = w_addchar (*word, word_length, max_length, words[1 + *offset]);
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- if (*word == NULL)
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- return WRDE_NOSPACE;
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-
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- ++(*offset);
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- break;
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- }
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-
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- return 0;
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-}
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-
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-static int
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-parse_qtd_backslash (char **word, size_t *word_length, size_t *max_length,
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- const char *words, size_t *offset)
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-{
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- /* We are poised _at_ a backslash, inside quotes */
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-
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- switch (words[1 + *offset])
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- {
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- case 0:
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- /* Backslash is last character of input words */
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- return WRDE_SYNTAX;
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-
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- case '\n':
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- ++(*offset);
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- break;
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-
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- case '$':
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- case '`':
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- case '"':
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- case '\\':
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- *word = w_addchar (*word, word_length, max_length, words[1 + *offset]);
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- if (*word == NULL)
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- return WRDE_NOSPACE;
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-
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- ++(*offset);
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- break;
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-
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- default:
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- *word = w_addchar (*word, word_length, max_length, words[*offset]);
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- if (*word != NULL)
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- *word = w_addchar (*word, word_length, max_length, words[1 + *offset]);
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-
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- if (*word == NULL)
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- return WRDE_NOSPACE;
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-
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- ++(*offset);
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- break;
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- }
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-
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- return 0;
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-}
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-
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-static int
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-parse_tilde (char **word, size_t *word_length, size_t *max_length,
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- const char *words, size_t *offset, size_t wordc)
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-{
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- /* We are poised _at_ a tilde */
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- size_t i;
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-
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- if (*word_length != 0)
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- {
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- if (!((*word)[*word_length - 1] == '=' && wordc == 0))
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- {
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- if (!((*word)[*word_length - 1] == ':'
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- && strchr (*word, '=') && wordc == 0))
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- {
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- *word = w_addchar (*word, word_length, max_length, '~');
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- return *word ? 0 : WRDE_NOSPACE;
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- }
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- }
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- }
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-
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- for (i = 1 + *offset; words[i]; i++)
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- {
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- if (words[i] == ':' || words[i] == '/' || words[i] == ' ' ||
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- words[i] == '\t' || words[i] == 0 )
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- break;
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-
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- if (words[i] == '\\')
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- {
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- *word = w_addchar (*word, word_length, max_length, '~');
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- return *word ? 0 : WRDE_NOSPACE;
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- }
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- }
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-
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- if (i == 1 + *offset)
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- {
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- /* Tilde appears on its own */
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- uid_t uid;
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- struct passwd pwd, *tpwd;
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- int buflen = 1000;
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- char* home;
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- char* buffer;
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- int result;
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-
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- /* POSIX.2 says ~ expands to $HOME and if HOME is unset the
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- results are unspecified. We do a lookup on the uid if
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- HOME is unset. */
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-
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- home = getenv ("HOME");
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- if (home != NULL)
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- {
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- *word = w_addstr (*word, word_length, max_length, home);
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- if (*word == NULL)
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- return WRDE_NOSPACE;
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- }
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- else
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- {
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- uid = getuid ();
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- buffer = alloca (buflen);
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-
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- while ((result = getpwuid_r (uid, &pwd, buffer, buflen, &tpwd)) != 0
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- && errno == ERANGE)
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- {
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- buflen += 1000;
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- buffer = alloca (buflen);
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- }
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-
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- if (result == 0 && tpwd != NULL && pwd.pw_dir != NULL)
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- {
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- *word = w_addstr (*word, word_length, max_length, pwd.pw_dir);
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- if (*word == NULL)
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- return WRDE_NOSPACE;
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- }
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- else
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- {
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- *word = w_addchar (*word, word_length, max_length, '~');
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- if (*word == NULL)
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- return WRDE_NOSPACE;
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- }
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- }
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- }
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- else
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- {
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- /* Look up user name in database to get home directory */
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- char *user = strndup (&words[1 + *offset], i - (1 + *offset));
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- struct passwd pwd, *tpwd;
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- int buflen = 1000;
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- char* buffer = alloca (buflen);
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- int result;
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-
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- while ((result = getpwnam_r (user, &pwd, buffer, buflen, &tpwd)) != 0
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- && errno == ERANGE)
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- {
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- buflen += 1000;
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- buffer = alloca (buflen);
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- }
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-
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- if (result == 0 && tpwd != NULL && pwd.pw_dir)
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- *word = w_addstr (*word, word_length, max_length, pwd.pw_dir);
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- else
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- {
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- /* (invalid login name) */
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- *word = w_addchar (*word, word_length, max_length, '~');
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- if (*word != NULL)
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- *word = w_addstr (*word, word_length, max_length, user);
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- }
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-
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- *offset = i - 1;
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- }
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- return *word ? 0 : WRDE_NOSPACE;
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-}
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-
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-
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-static int
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-do_parse_glob (const char *glob_word, char **word, size_t *word_length,
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- size_t *max_length, wordexp_t *pwordexp, const char *ifs,
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- const char *ifs_white)
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-{
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- int error;
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- int match;
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- glob_t globbuf;
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-
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- error = glob (glob_word, GLOB_NOCHECK, NULL, &globbuf);
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-
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- if (error != 0)
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- {
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- /* We can only run into memory problems. */
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- assert (error == GLOB_NOSPACE);
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- return WRDE_NOSPACE;
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- }
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-
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- if (ifs && !*ifs)
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- {
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- /* No field splitting allowed. */
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- assert (globbuf.gl_pathv[0] != NULL);
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- *word = w_addstr (*word, word_length, max_length, globbuf.gl_pathv[0]);
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- for (match = 1; match < globbuf.gl_pathc && *word != NULL; ++match)
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- {
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- *word = w_addchar (*word, word_length, max_length, ' ');
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- if (*word != NULL)
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- *word = w_addstr (*word, word_length, max_length,
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- globbuf.gl_pathv[match]);
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- }
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-
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- globfree (&globbuf);
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- return *word ? 0 : WRDE_NOSPACE;
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- }
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-
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- assert (ifs == NULL || *ifs != '\0');
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- if (*word != NULL)
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- {
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- free (*word);
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- *word = w_newword (word_length, max_length);
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- }
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-
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- for (match = 0; match < globbuf.gl_pathc; ++match)
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- {
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- char *matching_word = strdup (globbuf.gl_pathv[match]);
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- if (matching_word == NULL || w_addword (pwordexp, matching_word))
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- {
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- globfree (&globbuf);
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- return WRDE_NOSPACE;
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- }
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- }
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-
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- globfree (&globbuf);
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- return 0;
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-}
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-
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-static int
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-parse_glob (char **word, size_t *word_length, size_t *max_length,
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- const char *words, size_t *offset, int flags,
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|
|
- wordexp_t *pwordexp, const char *ifs, const char *ifs_white)
|
|
|
-{
|
|
|
- /* We are poised just after a '*', a '[' or a '?'. */
|
|
|
- int error = WRDE_NOSPACE;
|
|
|
- int quoted = 0; /* 1 if singly-quoted, 2 if doubly */
|
|
|
- int i;
|
|
|
- wordexp_t glob_list; /* List of words to glob */
|
|
|
-
|
|
|
- glob_list.we_wordc = 0;
|
|
|
- glob_list.we_wordv = NULL;
|
|
|
- glob_list.we_offs = 0;
|
|
|
- for (; words[*offset] != '\0'; ++*offset)
|
|
|
- {
|
|
|
- if ((ifs && strchr (ifs, words[*offset])) ||
|
|
|
- (!ifs && strchr (" \t\n", words[*offset])))
|
|
|
- /* Reached IFS */
|
|
|
- break;
|
|
|
-
|
|
|
- /* Sort out quoting */
|
|
|
- if (words[*offset] == '\'')
|
|
|
- {
|
|
|
- if (quoted == 0)
|
|
|
- {
|
|
|
- quoted = 1;
|
|
|
- continue;
|
|
|
- }
|
|
|
- else if (quoted == 1)
|
|
|
- {
|
|
|
- quoted = 0;
|
|
|
- continue;
|
|
|
- }
|
|
|
- }
|
|
|
- else if (words[*offset] == '"')
|
|
|
- {
|
|
|
- if (quoted == 0)
|
|
|
- {
|
|
|
- quoted = 2;
|
|
|
- continue;
|
|
|
- }
|
|
|
- else if (quoted == 2)
|
|
|
- {
|
|
|
- quoted = 0;
|
|
|
- continue;
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- /* Sort out other special characters */
|
|
|
- if (quoted != 1 && words[*offset] == '$')
|
|
|
- {
|
|
|
- error = parse_dollars (word, word_length, max_length, words,
|
|
|
- offset, flags, &glob_list, ifs, ifs_white,
|
|
|
- quoted == 2);
|
|
|
- if (error)
|
|
|
- goto tidy_up;
|
|
|
-
|
|
|
- continue;
|
|
|
- }
|
|
|
- else if (words[*offset] == '\\')
|
|
|
- {
|
|
|
- if (quoted)
|
|
|
- error = parse_qtd_backslash (word, word_length, max_length,
|
|
|
- words, offset);
|
|
|
- else
|
|
|
- error = parse_backslash (word, word_length, max_length,
|
|
|
- words, offset);
|
|
|
-
|
|
|
- if (error)
|
|
|
- goto tidy_up;
|
|
|
-
|
|
|
- continue;
|
|
|
- }
|
|
|
-
|
|
|
- *word = w_addchar (*word, word_length, max_length, words[*offset]);
|
|
|
- if (*word == NULL)
|
|
|
- goto tidy_up;
|
|
|
- }
|
|
|
-
|
|
|
- /* Don't forget to re-parse the character we stopped at. */
|
|
|
- --*offset;
|
|
|
-
|
|
|
- /* Glob the words */
|
|
|
- error = w_addword (&glob_list, *word);
|
|
|
- *word = w_newword (word_length, max_length);
|
|
|
- for (i = 0; error == 0 && i < glob_list.we_wordc; i++)
|
|
|
- error = do_parse_glob (glob_list.we_wordv[i], word, word_length,
|
|
|
- max_length, pwordexp, ifs, ifs_white);
|
|
|
-
|
|
|
- /* Now tidy up */
|
|
|
-tidy_up:
|
|
|
- wordfree (&glob_list);
|
|
|
- return error;
|
|
|
-}
|
|
|
-
|
|
|
-static int
|
|
|
-parse_squote (char **word, size_t *word_length, size_t *max_length,
|
|
|
- const char *words, size_t *offset)
|
|
|
-{
|
|
|
- /* We are poised just after a single quote */
|
|
|
- for (; words[*offset]; ++(*offset))
|
|
|
- {
|
|
|
- if (words[*offset] != '\'')
|
|
|
- {
|
|
|
- *word = w_addchar (*word, word_length, max_length, words[*offset]);
|
|
|
- if (*word == NULL)
|
|
|
- return WRDE_NOSPACE;
|
|
|
- }
|
|
|
- else return 0;
|
|
|
- }
|
|
|
-
|
|
|
- /* Unterminated string */
|
|
|
- return WRDE_SYNTAX;
|
|
|
-}
|
|
|
-
|
|
|
-/* Functions to evaluate an arithmetic expression */
|
|
|
-static int
|
|
|
-eval_expr_val (char **expr, long int *result)
|
|
|
-{
|
|
|
- int sgn = +1;
|
|
|
- char *digit;
|
|
|
-
|
|
|
- /* Skip white space */
|
|
|
- for (digit = *expr; digit && *digit && isspace (*digit); ++digit);
|
|
|
-
|
|
|
- switch (*digit)
|
|
|
- {
|
|
|
- case '(':
|
|
|
-
|
|
|
- /* Scan for closing paren */
|
|
|
- for (++digit; **expr && **expr != ')'; ++(*expr));
|
|
|
-
|
|
|
- /* Is there one? */
|
|
|
- if (!**expr)
|
|
|
- return WRDE_SYNTAX;
|
|
|
-
|
|
|
- *(*expr)++ = 0;
|
|
|
-
|
|
|
- if (eval_expr (digit, result))
|
|
|
- return WRDE_SYNTAX;
|
|
|
-
|
|
|
- return 0;
|
|
|
-
|
|
|
- case '+': /* Positive value */
|
|
|
- ++digit;
|
|
|
- break;
|
|
|
-
|
|
|
- case '-': /* Negative value */
|
|
|
- ++digit;
|
|
|
- sgn = -1;
|
|
|
- break;
|
|
|
-
|
|
|
- default:
|
|
|
- if (!isdigit (*digit))
|
|
|
- return WRDE_SYNTAX;
|
|
|
- }
|
|
|
-
|
|
|
- *result = 0;
|
|
|
- for (; *digit && isdigit (*digit); ++digit)
|
|
|
- *result = (*result * 10) + (*digit - '0');
|
|
|
-
|
|
|
- *expr = digit;
|
|
|
- *result *= sgn;
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-static int
|
|
|
-eval_expr_multdiv (char **expr, long int *result)
|
|
|
-{
|
|
|
- long int arg;
|
|
|
-
|
|
|
- /* Read a Value */
|
|
|
- if (eval_expr_val (expr, result) != 0)
|
|
|
- return WRDE_SYNTAX;
|
|
|
-
|
|
|
- while (**expr)
|
|
|
- {
|
|
|
- /* Skip white space */
|
|
|
- for (; *expr && **expr && isspace (**expr); ++(*expr));
|
|
|
-
|
|
|
- if (**expr == '*')
|
|
|
- {
|
|
|
- ++(*expr);
|
|
|
- if (eval_expr_val (expr, &arg) != 0)
|
|
|
- return WRDE_SYNTAX;
|
|
|
-
|
|
|
- *result *= arg;
|
|
|
- }
|
|
|
- else if (**expr == '/')
|
|
|
- {
|
|
|
- ++(*expr);
|
|
|
- if (eval_expr_val (expr, &arg) != 0)
|
|
|
- return WRDE_SYNTAX;
|
|
|
-
|
|
|
- *result /= arg;
|
|
|
- }
|
|
|
- else break;
|
|
|
- }
|
|
|
-
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-static int
|
|
|
-eval_expr (char *expr, long int *result)
|
|
|
-{
|
|
|
- long int arg;
|
|
|
-
|
|
|
- /* Read a Multdiv */
|
|
|
- if (eval_expr_multdiv (&expr, result) != 0)
|
|
|
- return WRDE_SYNTAX;
|
|
|
-
|
|
|
- while (*expr)
|
|
|
- {
|
|
|
- /* Skip white space */
|
|
|
- for (; expr && *expr && isspace (*expr); ++expr);
|
|
|
-
|
|
|
- if (*expr == '+')
|
|
|
- {
|
|
|
- ++expr;
|
|
|
- if (eval_expr_multdiv (&expr, &arg) != 0)
|
|
|
- return WRDE_SYNTAX;
|
|
|
-
|
|
|
- *result += arg;
|
|
|
- }
|
|
|
- else if (*expr == '-')
|
|
|
- {
|
|
|
- ++expr;
|
|
|
- if (eval_expr_multdiv (&expr, &arg) != 0)
|
|
|
- return WRDE_SYNTAX;
|
|
|
-
|
|
|
- *result -= arg;
|
|
|
- }
|
|
|
- else break;
|
|
|
- }
|
|
|
-
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-static int
|
|
|
-parse_arith (char **word, size_t *word_length, size_t *max_length,
|
|
|
- const char *words, size_t *offset, int flags, int bracket)
|
|
|
-{
|
|
|
- /* We are poised just after "$((" or "$[" */
|
|
|
- int error;
|
|
|
- int paren_depth = 1;
|
|
|
- size_t expr_length;
|
|
|
- size_t expr_maxlen;
|
|
|
- char *expr;
|
|
|
-
|
|
|
- expr = w_newword (&expr_length, &expr_maxlen);
|
|
|
- for (; words[*offset]; ++(*offset))
|
|
|
- {
|
|
|
- switch (words[*offset])
|
|
|
- {
|
|
|
- case '$':
|
|
|
- error = parse_dollars (&expr, &expr_length, &expr_maxlen,
|
|
|
- words, offset, flags, NULL, NULL, NULL, 1);
|
|
|
- /* The ``1'' here is to tell parse_dollars not to
|
|
|
- * split the fields.
|
|
|
- */
|
|
|
- if (error)
|
|
|
- {
|
|
|
- free (expr);
|
|
|
- return error;
|
|
|
- }
|
|
|
- break;
|
|
|
-
|
|
|
- case '`':
|
|
|
- (*offset)++;
|
|
|
- error = parse_backtick (&expr, &expr_length, &expr_maxlen,
|
|
|
- words, offset, flags, NULL, NULL, NULL);
|
|
|
- /* The first NULL here is to tell parse_backtick not to
|
|
|
- * split the fields.
|
|
|
- */
|
|
|
- if (error)
|
|
|
- {
|
|
|
- free (expr);
|
|
|
- return error;
|
|
|
- }
|
|
|
- break;
|
|
|
-
|
|
|
- case '\\':
|
|
|
- error = parse_qtd_backslash (&expr, &expr_length, &expr_maxlen,
|
|
|
- words, offset);
|
|
|
- if (error)
|
|
|
- {
|
|
|
- free (expr);
|
|
|
- return error;
|
|
|
- }
|
|
|
- /* I think that a backslash within an
|
|
|
- * arithmetic expansion is bound to
|
|
|
- * cause an error sooner or later anyway though.
|
|
|
- */
|
|
|
- break;
|
|
|
-
|
|
|
- case ')':
|
|
|
- if (--paren_depth == 0)
|
|
|
- {
|
|
|
- char result[21]; /* 21 = ceil(log10(2^64)) + 1 */
|
|
|
- long int numresult = 0;
|
|
|
- long long int convertme;
|
|
|
-
|
|
|
- if (bracket || words[1 + *offset] != ')')
|
|
|
- {
|
|
|
- free (expr);
|
|
|
- return WRDE_SYNTAX;
|
|
|
- }
|
|
|
-
|
|
|
- ++(*offset);
|
|
|
-
|
|
|
- /* Go - evaluate. */
|
|
|
- if (*expr && eval_expr (expr, &numresult) != 0)
|
|
|
- {
|
|
|
- free (expr);
|
|
|
- return WRDE_SYNTAX;
|
|
|
- }
|
|
|
-
|
|
|
- if (numresult < 0)
|
|
|
- {
|
|
|
- convertme = -numresult;
|
|
|
- *word = w_addchar (*word, word_length, max_length, '-');
|
|
|
- if (!*word)
|
|
|
- {
|
|
|
- free (expr);
|
|
|
- return WRDE_NOSPACE;
|
|
|
- }
|
|
|
- }
|
|
|
- else
|
|
|
- convertme = numresult;
|
|
|
-
|
|
|
- result[20] = '\0';
|
|
|
- *word = w_addstr (*word, word_length, max_length,
|
|
|
- itoa (convertme, &result[20], 10, 0));
|
|
|
- free (expr);
|
|
|
- return *word ? 0 : WRDE_NOSPACE;
|
|
|
- }
|
|
|
- expr = w_addchar (expr, &expr_length, &expr_maxlen, words[*offset]);
|
|
|
- if (expr == NULL)
|
|
|
- return WRDE_NOSPACE;
|
|
|
-
|
|
|
- break;
|
|
|
-
|
|
|
- case ']':
|
|
|
- if (bracket && paren_depth == 1)
|
|
|
- {
|
|
|
- char result[21]; /* 21 = ceil(log10(2^64)) + 1 */
|
|
|
- long int numresult = 0;
|
|
|
-
|
|
|
- /* Go - evaluate. */
|
|
|
- if (*expr && eval_expr (expr, &numresult) != 0)
|
|
|
- {
|
|
|
- free (expr);
|
|
|
- return WRDE_SYNTAX;
|
|
|
- }
|
|
|
-
|
|
|
- result[20] = '\0';
|
|
|
- *word = w_addstr (*word, word_length, max_length,
|
|
|
- itoa_word (numresult, &result[20], 10, 0));
|
|
|
- free (expr);
|
|
|
- return *word ? 0 : WRDE_NOSPACE;
|
|
|
- }
|
|
|
-
|
|
|
- free (expr);
|
|
|
- return WRDE_SYNTAX;
|
|
|
-
|
|
|
- case '\n':
|
|
|
- case ';':
|
|
|
- case '{':
|
|
|
- case '}':
|
|
|
- free (expr);
|
|
|
- return WRDE_BADCHAR;
|
|
|
-
|
|
|
- case '(':
|
|
|
- ++paren_depth;
|
|
|
- default:
|
|
|
- expr = w_addchar (expr, &expr_length, &expr_maxlen, words[*offset]);
|
|
|
- if (expr == NULL)
|
|
|
- return WRDE_NOSPACE;
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- /* Premature end */
|
|
|
- free (expr);
|
|
|
- return WRDE_SYNTAX;
|
|
|
-}
|
|
|
-
|
|
|
-/* Function called by child process in exec_comm() */
|
|
|
-static void
|
|
|
-exec_comm_child (char *comm, int *fildes, int showerr, int noexec)
|
|
|
-{
|
|
|
- const char *args[4] = { _PATH_BSHELL, "-c", comm, NULL };
|
|
|
-
|
|
|
- /* Execute the command, or just check syntax? */
|
|
|
- if (noexec)
|
|
|
- args[1] = "-nc";
|
|
|
-
|
|
|
- /* Redirect output. */
|
|
|
- dup2 (fildes[1], 1);
|
|
|
- close (fildes[1]);
|
|
|
-
|
|
|
- /* Redirect stderr to /dev/null if we have to. */
|
|
|
- if (showerr == 0)
|
|
|
- {
|
|
|
- int fd;
|
|
|
- close (2);
|
|
|
- fd = open (_PATH_DEVNULL, O_WRONLY);
|
|
|
- if (fd >= 0 && fd != 2)
|
|
|
- {
|
|
|
- dup2 (fd, 2);
|
|
|
- close (fd);
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- /* Make sure the subshell doesn't field-split on our behalf. */
|
|
|
- unsetenv ("IFS");
|
|
|
-
|
|
|
- close (fildes[0]);
|
|
|
- execve (_PATH_BSHELL, (char *const *) args, __environ);
|
|
|
-
|
|
|
- /* Bad. What now? */
|
|
|
- abort ();
|
|
|
-}
|
|
|
-
|
|
|
-/* Function to execute a command and retrieve the results */
|
|
|
-/* pwordexp contains NULL if field-splitting is forbidden */
|
|
|
-static int
|
|
|
-exec_comm (char *comm, char **word, size_t *word_length, size_t *max_length,
|
|
|
- int flags, wordexp_t *pwordexp, const char *ifs,
|
|
|
- const char *ifs_white)
|
|
|
-{
|
|
|
- int fildes[2];
|
|
|
- int bufsize = 128;
|
|
|
- int buflen;
|
|
|
- int i;
|
|
|
- int status = 0;
|
|
|
- size_t maxnewlines = 0;
|
|
|
- char *buffer;
|
|
|
- pid_t pid;
|
|
|
-
|
|
|
- /* Don't fork() unless necessary */
|
|
|
- if (!comm || !*comm)
|
|
|
- return 0;
|
|
|
-
|
|
|
- if (pipe (fildes))
|
|
|
- /* Bad */
|
|
|
- return WRDE_NOSPACE;
|
|
|
-
|
|
|
- if ((pid = fork ()) < 0)
|
|
|
- {
|
|
|
- /* Bad */
|
|
|
- close (fildes[0]);
|
|
|
- close (fildes[1]);
|
|
|
- return WRDE_NOSPACE;
|
|
|
- }
|
|
|
-
|
|
|
- if (pid == 0)
|
|
|
- exec_comm_child(comm, fildes, (flags & WRDE_SHOWERR), 0);
|
|
|
-
|
|
|
- /* Parent */
|
|
|
-
|
|
|
- close (fildes[1]);
|
|
|
- buffer = alloca (bufsize);
|
|
|
-
|
|
|
- if (!pwordexp)
|
|
|
- /* Quoted - no field splitting */
|
|
|
- {
|
|
|
- while (1)
|
|
|
- {
|
|
|
- if ((buflen = __read (fildes[0], buffer, bufsize)) < 1)
|
|
|
- {
|
|
|
- if (waitpid (pid, &status, WNOHANG) == 0)
|
|
|
- continue;
|
|
|
- if ((buflen = __read (fildes[0], buffer, bufsize)) < 1)
|
|
|
- break;
|
|
|
- }
|
|
|
-
|
|
|
- maxnewlines += buflen;
|
|
|
-
|
|
|
- *word = w_addmem (*word, word_length, max_length, buffer, buflen);
|
|
|
- if (*word == NULL)
|
|
|
- goto no_space;
|
|
|
- }
|
|
|
- }
|
|
|
- else
|
|
|
- /* Not quoted - split fields */
|
|
|
- {
|
|
|
- int copying = 0;
|
|
|
- /* 'copying' is:
|
|
|
- * 0 when searching for first character in a field not IFS white space
|
|
|
- * 1 when copying the text of a field
|
|
|
- * 2 when searching for possible non-whitespace IFS
|
|
|
- * 3 when searching for non-newline after copying field
|
|
|
- */
|
|
|
-
|
|
|
- while (1)
|
|
|
- {
|
|
|
- if ((buflen = __read (fildes[0], buffer, bufsize)) < 1)
|
|
|
- {
|
|
|
- if (waitpid (pid, &status, WNOHANG) == 0)
|
|
|
- continue;
|
|
|
- if ((buflen = __read (fildes[0], buffer, bufsize)) < 1)
|
|
|
- break;
|
|
|
- }
|
|
|
-
|
|
|
- for (i = 0; i < buflen; ++i)
|
|
|
- {
|
|
|
- if (strchr (ifs, buffer[i]) != NULL)
|
|
|
- {
|
|
|
- /* Current character is IFS */
|
|
|
- if (strchr (ifs_white, buffer[i]) == NULL)
|
|
|
- {
|
|
|
- /* Current character is IFS but not whitespace */
|
|
|
- if (copying == 2)
|
|
|
- {
|
|
|
- /* current character
|
|
|
- * |
|
|
|
- * V
|
|
|
- * eg: text<space><comma><space>moretext
|
|
|
- *
|
|
|
- * So, strip whitespace IFS (like at the start)
|
|
|
- */
|
|
|
- copying = 0;
|
|
|
- continue;
|
|
|
- }
|
|
|
-
|
|
|
- copying = 0;
|
|
|
- /* fall through and delimit field.. */
|
|
|
- }
|
|
|
- else
|
|
|
- {
|
|
|
- if (buffer[i] == '\n')
|
|
|
- {
|
|
|
- /* Current character is (IFS) newline */
|
|
|
-
|
|
|
- /* If copying a field, this is the end of it,
|
|
|
- but maybe all that's left is trailing newlines.
|
|
|
- So start searching for a non-newline. */
|
|
|
- if (copying == 1)
|
|
|
- copying = 3;
|
|
|
-
|
|
|
- continue;
|
|
|
- }
|
|
|
- else
|
|
|
- {
|
|
|
- /* Current character is IFS white space, but
|
|
|
- not a newline */
|
|
|
-
|
|
|
- /* If not either copying a field or searching
|
|
|
- for non-newline after a field, ignore it */
|
|
|
- if (copying != 1 && copying != 3)
|
|
|
- continue;
|
|
|
-
|
|
|
- /* End of field (search for non-ws IFS afterwards) */
|
|
|
- copying = 2;
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- /* First IFS white space (non-newline), or IFS non-whitespace.
|
|
|
- * Delimit the field. Nulls are converted by w_addword. */
|
|
|
- if (w_addword (pwordexp, *word) == WRDE_NOSPACE)
|
|
|
- goto no_space;
|
|
|
-
|
|
|
- *word = w_newword (word_length, max_length);
|
|
|
-
|
|
|
- maxnewlines = 0;
|
|
|
- /* fall back round the loop.. */
|
|
|
- }
|
|
|
- else
|
|
|
- {
|
|
|
- /* Not IFS character */
|
|
|
-
|
|
|
- if (copying == 3)
|
|
|
- {
|
|
|
- /* Nothing but (IFS) newlines since the last field,
|
|
|
- so delimit it here before starting new word */
|
|
|
- if (w_addword (pwordexp, *word) == WRDE_NOSPACE)
|
|
|
- goto no_space;
|
|
|
-
|
|
|
- *word = w_newword (word_length, max_length);
|
|
|
- }
|
|
|
-
|
|
|
- copying = 1;
|
|
|
-
|
|
|
- if (buffer[i] == '\n') /* happens if newline not in IFS */
|
|
|
- maxnewlines++;
|
|
|
- else
|
|
|
- maxnewlines = 0;
|
|
|
-
|
|
|
- *word = w_addchar (*word, word_length, max_length,
|
|
|
- buffer[i]);
|
|
|
- if (*word == NULL)
|
|
|
- goto no_space;
|
|
|
- }
|
|
|
- }
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- /* Chop off trailing newlines (required by POSIX.2) */
|
|
|
- /* Ensure we don't go back further than the beginning of the
|
|
|
- substitution (i.e. remove maxnewlines bytes at most) */
|
|
|
- while (maxnewlines-- != 0 &&
|
|
|
- *word_length > 0 && (*word)[*word_length - 1] == '\n')
|
|
|
- {
|
|
|
- (*word)[--*word_length] = '\0';
|
|
|
-
|
|
|
- /* If the last word was entirely newlines, turn it into a new word
|
|
|
- * which can be ignored if there's nothing following it. */
|
|
|
- if (*word_length == 0)
|
|
|
- {
|
|
|
- free (*word);
|
|
|
- *word = w_newword (word_length, max_length);
|
|
|
- break;
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- close (fildes[0]);
|
|
|
-
|
|
|
- /* Check for syntax error (re-execute but with "-n" flag) */
|
|
|
- if (buflen < 1 && status != 0)
|
|
|
- {
|
|
|
- if ((pid = fork ()) < 0)
|
|
|
- {
|
|
|
- /* Bad */
|
|
|
- return WRDE_NOSPACE;
|
|
|
- }
|
|
|
-
|
|
|
- if (pid == 0)
|
|
|
- {
|
|
|
- fildes[0] = fildes[1] = -1;
|
|
|
- exec_comm_child(comm, fildes, 0, 1);
|
|
|
- }
|
|
|
-
|
|
|
- if (waitpid (pid, &status, 0) == pid && status != 0)
|
|
|
- return WRDE_SYNTAX;
|
|
|
- }
|
|
|
-
|
|
|
- return 0;
|
|
|
-
|
|
|
-no_space:
|
|
|
- kill (pid, SIGKILL);
|
|
|
- waitpid (pid, NULL, 0);
|
|
|
- close (fildes[0]);
|
|
|
- return WRDE_NOSPACE;
|
|
|
-}
|
|
|
-
|
|
|
-static int
|
|
|
-parse_comm (char **word, size_t *word_length, size_t *max_length,
|
|
|
- const char *words, size_t *offset, int flags, wordexp_t *pwordexp,
|
|
|
- const char *ifs, const char *ifs_white)
|
|
|
-{
|
|
|
- /* We are poised just after "$(" */
|
|
|
- int paren_depth = 1;
|
|
|
- int error = 0;
|
|
|
- int quoted = 0; /* 1 for singly-quoted, 2 for doubly-quoted */
|
|
|
- size_t comm_length;
|
|
|
- size_t comm_maxlen;
|
|
|
- char *comm = w_newword (&comm_length, &comm_maxlen);
|
|
|
-
|
|
|
- for (; words[*offset]; ++(*offset))
|
|
|
- {
|
|
|
- switch (words[*offset])
|
|
|
- {
|
|
|
- case '\'':
|
|
|
- if (quoted == 0)
|
|
|
- quoted = 1;
|
|
|
- else if (quoted == 1)
|
|
|
- quoted = 0;
|
|
|
-
|
|
|
- break;
|
|
|
-
|
|
|
- case '"':
|
|
|
- if (quoted == 0)
|
|
|
- quoted = 2;
|
|
|
- else if (quoted == 2)
|
|
|
- quoted = 0;
|
|
|
-
|
|
|
- break;
|
|
|
-
|
|
|
- case ')':
|
|
|
- if (!quoted && --paren_depth == 0)
|
|
|
- {
|
|
|
- /* Go -- give script to the shell */
|
|
|
- if (comm)
|
|
|
- {
|
|
|
- error = exec_comm (comm, word, word_length, max_length,
|
|
|
- flags, pwordexp, ifs, ifs_white);
|
|
|
- free (comm);
|
|
|
- }
|
|
|
-
|
|
|
- return error;
|
|
|
- }
|
|
|
-
|
|
|
- /* This is just part of the script */
|
|
|
- break;
|
|
|
-
|
|
|
- case '(':
|
|
|
- if (!quoted)
|
|
|
- ++paren_depth;
|
|
|
- }
|
|
|
-
|
|
|
- comm = w_addchar (comm, &comm_length, &comm_maxlen, words[*offset]);
|
|
|
- if (comm == NULL)
|
|
|
- return WRDE_NOSPACE;
|
|
|
- }
|
|
|
-
|
|
|
- /* Premature end */
|
|
|
- if (comm)
|
|
|
- free (comm);
|
|
|
-
|
|
|
- return WRDE_SYNTAX;
|
|
|
-}
|
|
|
-
|
|
|
-static int
|
|
|
-parse_param (char **word, size_t *word_length, size_t *max_length,
|
|
|
- const char *words, size_t *offset, int flags, wordexp_t *pwordexp,
|
|
|
- const char *ifs, const char *ifs_white, int quoted)
|
|
|
-{
|
|
|
- /* We are poised just after "$" */
|
|
|
- enum action
|
|
|
- {
|
|
|
- ACT_NONE,
|
|
|
- ACT_RP_SHORT_LEFT = '#',
|
|
|
- ACT_RP_LONG_LEFT = 'L',
|
|
|
- ACT_RP_SHORT_RIGHT = '%',
|
|
|
- ACT_RP_LONG_RIGHT = 'R',
|
|
|
- ACT_NULL_ERROR = '?',
|
|
|
- ACT_NULL_SUBST = '-',
|
|
|
- ACT_NONNULL_SUBST = '+',
|
|
|
- ACT_NULL_ASSIGN = '='
|
|
|
- };
|
|
|
- size_t env_length;
|
|
|
- size_t env_maxlen;
|
|
|
- size_t pat_length;
|
|
|
- size_t pat_maxlen;
|
|
|
- size_t start = *offset;
|
|
|
- char *env;
|
|
|
- char *pattern;
|
|
|
- char *value = NULL;
|
|
|
- enum action action = ACT_NONE;
|
|
|
- int depth = 0;
|
|
|
- int colon_seen = 0;
|
|
|
- int seen_hash = 0;
|
|
|
- int free_value = 0;
|
|
|
- int pattern_is_quoted = 0; /* 1 for singly-quoted, 2 for doubly-quoted */
|
|
|
- int error;
|
|
|
- int special = 0;
|
|
|
- char buffer[21];
|
|
|
- int brace = words[*offset] == '{';
|
|
|
-
|
|
|
- env = w_newword (&env_length, &env_maxlen);
|
|
|
- pattern = w_newword (&pat_length, &pat_maxlen);
|
|
|
-
|
|
|
- if (brace)
|
|
|
- ++*offset;
|
|
|
-
|
|
|
- /* First collect the parameter name. */
|
|
|
-
|
|
|
- if (words[*offset] == '#')
|
|
|
- {
|
|
|
- seen_hash = 1;
|
|
|
- if (!brace)
|
|
|
- goto envsubst;
|
|
|
- ++*offset;
|
|
|
- }
|
|
|
-
|
|
|
- if (isalpha (words[*offset]) || words[*offset] == '_')
|
|
|
- {
|
|
|
- /* Normal parameter name. */
|
|
|
- do
|
|
|
- {
|
|
|
- env = w_addchar (env, &env_length, &env_maxlen,
|
|
|
- words[*offset]);
|
|
|
- if (env == NULL)
|
|
|
- goto no_space;
|
|
|
- }
|
|
|
- while (isalnum (words[++*offset]) || words[*offset] == '_');
|
|
|
- }
|
|
|
- else if (isdigit (words[*offset]))
|
|
|
- {
|
|
|
- /* Numeric parameter name. */
|
|
|
- special = 1;
|
|
|
- do
|
|
|
- {
|
|
|
- env = w_addchar (env, &env_length, &env_maxlen,
|
|
|
- words[*offset]);
|
|
|
- if (env == NULL)
|
|
|
- goto no_space;
|
|
|
- if (!brace)
|
|
|
- goto envsubst;
|
|
|
- }
|
|
|
- while (isdigit(words[++*offset]));
|
|
|
- }
|
|
|
- else if (strchr ("*@$", words[*offset]) != NULL)
|
|
|
- {
|
|
|
- /* Special parameter. */
|
|
|
- special = 1;
|
|
|
- env = w_addchar (env, &env_length, &env_maxlen,
|
|
|
- words[*offset]);
|
|
|
- if (env == NULL)
|
|
|
- goto no_space;
|
|
|
- ++*offset;
|
|
|
- }
|
|
|
- else
|
|
|
- {
|
|
|
- if (brace)
|
|
|
- goto syntax;
|
|
|
- }
|
|
|
-
|
|
|
- if (brace)
|
|
|
- {
|
|
|
- /* Check for special action to be applied to the value. */
|
|
|
- switch (words[*offset])
|
|
|
- {
|
|
|
- case '}':
|
|
|
- /* Evaluate. */
|
|
|
- goto envsubst;
|
|
|
-
|
|
|
- case '#':
|
|
|
- action = ACT_RP_SHORT_LEFT;
|
|
|
- if (words[1 + *offset] == '#')
|
|
|
- {
|
|
|
- ++*offset;
|
|
|
- action = ACT_RP_LONG_LEFT;
|
|
|
- }
|
|
|
- break;
|
|
|
-
|
|
|
- case '%':
|
|
|
- action = ACT_RP_SHORT_RIGHT;
|
|
|
- if (words[1 + *offset] == '%')
|
|
|
- {
|
|
|
- ++*offset;
|
|
|
- action = ACT_RP_LONG_RIGHT;
|
|
|
- }
|
|
|
- break;
|
|
|
-
|
|
|
- case ':':
|
|
|
- if (strchr ("-=?+", words[1 + *offset]) == NULL)
|
|
|
- goto syntax;
|
|
|
-
|
|
|
- colon_seen = 1;
|
|
|
- action = words[++*offset];
|
|
|
- break;
|
|
|
-
|
|
|
- case '-':
|
|
|
- case '=':
|
|
|
- case '?':
|
|
|
- case '+':
|
|
|
- action = words[*offset];
|
|
|
- break;
|
|
|
-
|
|
|
- default:
|
|
|
- goto syntax;
|
|
|
- }
|
|
|
-
|
|
|
- /* Now collect the pattern, but don't expand it yet. */
|
|
|
- ++*offset;
|
|
|
- for (; words[*offset]; ++(*offset))
|
|
|
- {
|
|
|
- switch (words[*offset])
|
|
|
- {
|
|
|
- case '{':
|
|
|
- if (!pattern_is_quoted)
|
|
|
- ++depth;
|
|
|
- break;
|
|
|
-
|
|
|
- case '}':
|
|
|
- if (!pattern_is_quoted)
|
|
|
- {
|
|
|
- if (depth == 0)
|
|
|
- goto envsubst;
|
|
|
- --depth;
|
|
|
- }
|
|
|
- break;
|
|
|
-
|
|
|
- case '\\':
|
|
|
- if (pattern_is_quoted)
|
|
|
- /* Quoted; treat as normal character. */
|
|
|
- break;
|
|
|
-
|
|
|
- /* Otherwise, it's an escape: next character is literal. */
|
|
|
- if (words[++*offset] == '\0')
|
|
|
- goto syntax;
|
|
|
-
|
|
|
- pattern = w_addchar (pattern, &pat_length, &pat_maxlen, '\\');
|
|
|
- if (pattern == NULL)
|
|
|
- goto no_space;
|
|
|
-
|
|
|
- break;
|
|
|
-
|
|
|
- case '\'':
|
|
|
- if (pattern_is_quoted == 0)
|
|
|
- pattern_is_quoted = 1;
|
|
|
- else if (pattern_is_quoted == 1)
|
|
|
- pattern_is_quoted = 0;
|
|
|
-
|
|
|
- break;
|
|
|
-
|
|
|
- case '"':
|
|
|
- if (pattern_is_quoted == 0)
|
|
|
- pattern_is_quoted = 2;
|
|
|
- else if (pattern_is_quoted == 2)
|
|
|
- pattern_is_quoted = 0;
|
|
|
-
|
|
|
- break;
|
|
|
- }
|
|
|
-
|
|
|
- pattern = w_addchar (pattern, &pat_length, &pat_maxlen,
|
|
|
- words[*offset]);
|
|
|
- if (pattern == NULL)
|
|
|
- goto no_space;
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- /* End of input string -- remember to reparse the character that we
|
|
|
- * stopped at. */
|
|
|
- --(*offset);
|
|
|
-
|
|
|
-envsubst:
|
|
|
- if (words[start] == '{' && words[*offset] != '}')
|
|
|
- goto syntax;
|
|
|
-
|
|
|
- if (env == NULL)
|
|
|
- {
|
|
|
- if (seen_hash)
|
|
|
- {
|
|
|
- /* $# expands to the number of positional parameters */
|
|
|
- buffer[20] = '\0';
|
|
|
- value = itoa_word (__libc_argc - 1, &buffer[20], 10, 0);
|
|
|
- seen_hash = 0;
|
|
|
- }
|
|
|
- else
|
|
|
- {
|
|
|
- /* Just $ on its own */
|
|
|
- *offset = start - 1;
|
|
|
- *word = w_addchar (*word, word_length, max_length, '$');
|
|
|
- return *word ? 0 : WRDE_NOSPACE;
|
|
|
- }
|
|
|
- }
|
|
|
- /* Is it a numeric parameter? */
|
|
|
- else if (isdigit (env[0]))
|
|
|
- {
|
|
|
- int n = atoi (env);
|
|
|
-
|
|
|
- if (n >= __libc_argc)
|
|
|
- /* Substitute NULL. */
|
|
|
- value = NULL;
|
|
|
- else
|
|
|
- /* Replace with appropriate positional parameter. */
|
|
|
- value = __libc_argv[n];
|
|
|
- }
|
|
|
- /* Is it a special parameter? */
|
|
|
- else if (special)
|
|
|
- {
|
|
|
- /* Is it `$$'? */
|
|
|
- if (*env == '$')
|
|
|
- {
|
|
|
- buffer[20] = '\0';
|
|
|
- value = itoa_word (__getpid (), &buffer[20], 10, 0);
|
|
|
- }
|
|
|
- /* Is it `${#*}' or `${#@}'? */
|
|
|
- else if ((*env == '*' || *env == '@') && seen_hash)
|
|
|
- {
|
|
|
- buffer[20] = '\0';
|
|
|
- value = itoa_word (__libc_argc > 0 ? __libc_argc - 1 : 0,
|
|
|
- &buffer[20], 10, 0);
|
|
|
- *word = w_addstr (*word, word_length, max_length, value);
|
|
|
- free (env);
|
|
|
- if (pattern)
|
|
|
- free (pattern);
|
|
|
- return *word ? 0 : WRDE_NOSPACE;
|
|
|
- }
|
|
|
- /* Is it `$*' or `$@' (unquoted) ? */
|
|
|
- else if (*env == '*' || (*env == '@' && !quoted))
|
|
|
- {
|
|
|
- size_t plist_len = 0;
|
|
|
- int p;
|
|
|
- char *end;
|
|
|
-
|
|
|
- /* Build up value parameter by parameter (copy them) */
|
|
|
- for (p = 1; __libc_argv[p]; ++p)
|
|
|
- plist_len += strlen (__libc_argv[p]) + 1; /* for space */
|
|
|
- value = malloc (plist_len);
|
|
|
- if (value == NULL)
|
|
|
- goto no_space;
|
|
|
- end = value;
|
|
|
- *end = 0;
|
|
|
- for (p = 1; __libc_argv[p]; ++p)
|
|
|
- {
|
|
|
- if (p > 1)
|
|
|
- *end++ = ' ';
|
|
|
- end = __stpcpy (end, __libc_argv[p]);
|
|
|
- }
|
|
|
-
|
|
|
- free_value = 1;
|
|
|
- }
|
|
|
- else
|
|
|
- {
|
|
|
- /* Must be a quoted `$@' */
|
|
|
- assert (*env == '@' && quoted);
|
|
|
-
|
|
|
- /* Each parameter is a separate word ("$@") */
|
|
|
- if (__libc_argc == 2)
|
|
|
- value = __libc_argv[1];
|
|
|
- else if (__libc_argc > 2)
|
|
|
- {
|
|
|
- int p;
|
|
|
-
|
|
|
- /* Append first parameter to current word. */
|
|
|
- value = w_addstr (*word, word_length, max_length,
|
|
|
- __libc_argv[1]);
|
|
|
- if (value == NULL || w_addword (pwordexp, value))
|
|
|
- goto no_space;
|
|
|
-
|
|
|
- for (p = 2; __libc_argv[p + 1]; p++)
|
|
|
- {
|
|
|
- char *newword = strdup (__libc_argv[p]);
|
|
|
- if (newword == NULL || w_addword (pwordexp, newword))
|
|
|
- goto no_space;
|
|
|
- }
|
|
|
-
|
|
|
- /* Start a new word with the last parameter. */
|
|
|
- *word = w_newword (word_length, max_length);
|
|
|
- value = __libc_argv[p];
|
|
|
- }
|
|
|
- else
|
|
|
- {
|
|
|
- free (env);
|
|
|
- free (pattern);
|
|
|
- return 0;
|
|
|
- }
|
|
|
- }
|
|
|
- }
|
|
|
- else
|
|
|
- value = getenv (env);
|
|
|
-
|
|
|
- if (value == NULL && (flags & WRDE_UNDEF))
|
|
|
- {
|
|
|
- /* Variable not defined. */
|
|
|
- error = WRDE_BADVAL;
|
|
|
- goto do_error;
|
|
|
- }
|
|
|
-
|
|
|
- if (action != ACT_NONE)
|
|
|
- {
|
|
|
- int expand_pattern = 0;
|
|
|
-
|
|
|
- /* First, find out if we need to expand pattern (i.e. if we will
|
|
|
- * use it). */
|
|
|
- switch (action)
|
|
|
- {
|
|
|
- case ACT_RP_SHORT_LEFT:
|
|
|
- case ACT_RP_LONG_LEFT:
|
|
|
- case ACT_RP_SHORT_RIGHT:
|
|
|
- case ACT_RP_LONG_RIGHT:
|
|
|
- /* Always expand for these. */
|
|
|
- expand_pattern = 1;
|
|
|
- break;
|
|
|
-
|
|
|
- case ACT_NULL_ERROR:
|
|
|
- case ACT_NULL_SUBST:
|
|
|
- case ACT_NULL_ASSIGN:
|
|
|
- if (!value || (!*value && colon_seen))
|
|
|
- /* If param is unset, or set but null and a colon has been seen,
|
|
|
- the expansion of the pattern will be needed. */
|
|
|
- expand_pattern = 1;
|
|
|
-
|
|
|
- break;
|
|
|
-
|
|
|
- case ACT_NONNULL_SUBST:
|
|
|
- /* Expansion of word will be needed if parameter is set and not null,
|
|
|
- or set null but no colon has been seen. */
|
|
|
- if (value && (*value || !colon_seen))
|
|
|
- expand_pattern = 1;
|
|
|
-
|
|
|
- break;
|
|
|
-
|
|
|
- default:
|
|
|
- assert (! "Unrecognised action!");
|
|
|
- }
|
|
|
-
|
|
|
- if (expand_pattern)
|
|
|
- {
|
|
|
- /* We need to perform tilde expansion, parameter expansion,
|
|
|
- command substitution, and arithmetic expansion. We also
|
|
|
- have to be a bit careful with wildcard characters, as
|
|
|
- pattern might be given to fnmatch soon. To do this, we
|
|
|
- convert quotes to escapes. */
|
|
|
-
|
|
|
- char *expanded;
|
|
|
- size_t exp_len;
|
|
|
- size_t exp_maxl;
|
|
|
- char *p;
|
|
|
- int quoted = 0; /* 1: single quotes; 2: double */
|
|
|
-
|
|
|
- expanded = w_newword (&exp_len, &exp_maxl);
|
|
|
- for (p = pattern; p && *p; p++)
|
|
|
- {
|
|
|
- size_t offset;
|
|
|
-
|
|
|
- switch (*p)
|
|
|
- {
|
|
|
- case '"':
|
|
|
- if (quoted == 2)
|
|
|
- quoted = 0;
|
|
|
- else if (quoted == 0)
|
|
|
- quoted = 2;
|
|
|
- else break;
|
|
|
-
|
|
|
- continue;
|
|
|
-
|
|
|
- case '\'':
|
|
|
- if (quoted == 1)
|
|
|
- quoted = 0;
|
|
|
- else if (quoted == 0)
|
|
|
- quoted = 1;
|
|
|
- else break;
|
|
|
-
|
|
|
- continue;
|
|
|
-
|
|
|
- case '*':
|
|
|
- case '?':
|
|
|
- if (quoted)
|
|
|
- {
|
|
|
- /* Convert quoted wildchar to escaped wildchar. */
|
|
|
- expanded = w_addchar (expanded, &exp_len,
|
|
|
- &exp_maxl, '\\');
|
|
|
-
|
|
|
- if (expanded == NULL)
|
|
|
- goto no_space;
|
|
|
- }
|
|
|
- break;
|
|
|
-
|
|
|
- case '$':
|
|
|
- offset = 0;
|
|
|
- error = parse_dollars (&expanded, &exp_len, &exp_maxl, p,
|
|
|
- &offset, flags, NULL, NULL, NULL, 1);
|
|
|
- if (error)
|
|
|
- {
|
|
|
- if (free_value)
|
|
|
- free (value);
|
|
|
-
|
|
|
- if (expanded)
|
|
|
- free (expanded);
|
|
|
-
|
|
|
- goto do_error;
|
|
|
- }
|
|
|
-
|
|
|
- p += offset;
|
|
|
- continue;
|
|
|
-
|
|
|
- case '~':
|
|
|
- if (quoted || exp_len)
|
|
|
- break;
|
|
|
-
|
|
|
- offset = 0;
|
|
|
- error = parse_tilde (&expanded, &exp_len, &exp_maxl, p,
|
|
|
- &offset, 0);
|
|
|
- if (error)
|
|
|
- {
|
|
|
- if (free_value)
|
|
|
- free (value);
|
|
|
-
|
|
|
- if (expanded)
|
|
|
- free (expanded);
|
|
|
-
|
|
|
- goto do_error;
|
|
|
- }
|
|
|
-
|
|
|
- p += offset;
|
|
|
- continue;
|
|
|
-
|
|
|
- case '\\':
|
|
|
- expanded = w_addchar (expanded, &exp_len, &exp_maxl, '\\');
|
|
|
- ++p;
|
|
|
- assert (*p); /* checked when extracted initially */
|
|
|
- if (expanded == NULL)
|
|
|
- goto no_space;
|
|
|
- }
|
|
|
-
|
|
|
- expanded = w_addchar (expanded, &exp_len, &exp_maxl, *p);
|
|
|
-
|
|
|
- if (expanded == NULL)
|
|
|
- goto no_space;
|
|
|
- }
|
|
|
-
|
|
|
- if (pattern)
|
|
|
- free (pattern);
|
|
|
-
|
|
|
- pattern = expanded;
|
|
|
- }
|
|
|
-
|
|
|
- switch (action)
|
|
|
- {
|
|
|
- case ACT_RP_SHORT_LEFT:
|
|
|
- case ACT_RP_LONG_LEFT:
|
|
|
- case ACT_RP_SHORT_RIGHT:
|
|
|
- case ACT_RP_LONG_RIGHT:
|
|
|
- {
|
|
|
- char *p;
|
|
|
- char c;
|
|
|
- char *end;
|
|
|
-
|
|
|
- if (value == NULL || pattern == NULL || *pattern == '\0')
|
|
|
- break;
|
|
|
-
|
|
|
- end = value + strlen (value);
|
|
|
-
|
|
|
- switch (action)
|
|
|
- {
|
|
|
- case ACT_RP_SHORT_LEFT:
|
|
|
- for (p = value; p <= end; ++p)
|
|
|
- {
|
|
|
- c = *p;
|
|
|
- *p = '\0';
|
|
|
- if (fnmatch (pattern, value, 0) != FNM_NOMATCH)
|
|
|
- {
|
|
|
- *p = c;
|
|
|
- if (free_value)
|
|
|
- {
|
|
|
- char *newval = strdup (p);
|
|
|
- if (newval == NULL)
|
|
|
- {
|
|
|
- free (value);
|
|
|
- goto no_space;
|
|
|
- }
|
|
|
- free (value);
|
|
|
- value = newval;
|
|
|
- }
|
|
|
- else
|
|
|
- value = p;
|
|
|
- break;
|
|
|
- }
|
|
|
- *p = c;
|
|
|
- }
|
|
|
-
|
|
|
- break;
|
|
|
-
|
|
|
- case ACT_RP_LONG_LEFT:
|
|
|
- for (p = end; p >= value; --p)
|
|
|
- {
|
|
|
- c = *p;
|
|
|
- *p = '\0';
|
|
|
- if (fnmatch (pattern, value, 0) != FNM_NOMATCH)
|
|
|
- {
|
|
|
- *p = c;
|
|
|
- if (free_value)
|
|
|
- {
|
|
|
- char *newval = strdup (p);
|
|
|
- if (newval == NULL)
|
|
|
- {
|
|
|
- free (value);
|
|
|
- goto no_space;
|
|
|
- }
|
|
|
- free (value);
|
|
|
- value = newval;
|
|
|
- }
|
|
|
- else
|
|
|
- value = p;
|
|
|
- break;
|
|
|
- }
|
|
|
- *p = c;
|
|
|
- }
|
|
|
-
|
|
|
- break;
|
|
|
-
|
|
|
- case ACT_RP_SHORT_RIGHT:
|
|
|
- for (p = end; p >= value; --p)
|
|
|
- {
|
|
|
- if (fnmatch (pattern, p, 0) != FNM_NOMATCH)
|
|
|
- {
|
|
|
- char *newval;
|
|
|
- newval = malloc (p - value + 1);
|
|
|
-
|
|
|
- if (newval == NULL)
|
|
|
- {
|
|
|
- if (free_value)
|
|
|
- free (value);
|
|
|
- goto no_space;
|
|
|
- }
|
|
|
-
|
|
|
- *(char *) mempcpy (newval, value, p - value) = '\0';
|
|
|
- if (free_value)
|
|
|
- free (value);
|
|
|
- value = newval;
|
|
|
- free_value = 1;
|
|
|
- break;
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- break;
|
|
|
-
|
|
|
- case ACT_RP_LONG_RIGHT:
|
|
|
- for (p = value; p <= end; ++p)
|
|
|
- {
|
|
|
- if (fnmatch (pattern, p, 0) != FNM_NOMATCH)
|
|
|
- {
|
|
|
- char *newval;
|
|
|
- newval = malloc (p - value + 1);
|
|
|
-
|
|
|
- if (newval == NULL)
|
|
|
- {
|
|
|
- if (free_value)
|
|
|
- free (value);
|
|
|
- goto no_space;
|
|
|
- }
|
|
|
-
|
|
|
- *(char *) mempcpy (newval, value, p - value) = '\0';
|
|
|
- if (free_value)
|
|
|
- free (value);
|
|
|
- value = newval;
|
|
|
- free_value = 1;
|
|
|
- break;
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- break;
|
|
|
-
|
|
|
- default:
|
|
|
- break;
|
|
|
- }
|
|
|
-
|
|
|
- break;
|
|
|
- }
|
|
|
-
|
|
|
- case ACT_NULL_ERROR:
|
|
|
- if (value && *value)
|
|
|
- /* Substitute parameter */
|
|
|
- break;
|
|
|
-
|
|
|
- error = 0;
|
|
|
- if (!colon_seen && value)
|
|
|
- /* Substitute NULL */
|
|
|
- ;
|
|
|
- else if (*pattern)
|
|
|
- fprintf (stderr, "%s: %s\n", env, pattern);
|
|
|
- else
|
|
|
- {
|
|
|
- fprintf (stderr, "%s: parameter null or not set\n", env);
|
|
|
- error = WRDE_BADVAL;
|
|
|
- }
|
|
|
-
|
|
|
- if (free_value)
|
|
|
- free (value);
|
|
|
- goto do_error;
|
|
|
-
|
|
|
- case ACT_NULL_SUBST:
|
|
|
- if (value && *value)
|
|
|
- /* Substitute parameter */
|
|
|
- break;
|
|
|
-
|
|
|
- if (free_value && value)
|
|
|
- free (value);
|
|
|
-
|
|
|
- if (!colon_seen && value)
|
|
|
- /* Substitute NULL */
|
|
|
- goto success;
|
|
|
-
|
|
|
- value = pattern ? strdup (pattern) : pattern;
|
|
|
- free_value = 1;
|
|
|
-
|
|
|
- if (pattern && !value)
|
|
|
- goto no_space;
|
|
|
-
|
|
|
- break;
|
|
|
-
|
|
|
- case ACT_NONNULL_SUBST:
|
|
|
- if (value && (*value || !colon_seen))
|
|
|
- {
|
|
|
- if (free_value && value)
|
|
|
- free (value);
|
|
|
-
|
|
|
- value = pattern ? strdup (pattern) : pattern;
|
|
|
- free_value = 1;
|
|
|
-
|
|
|
- if (pattern && !value)
|
|
|
- goto no_space;
|
|
|
-
|
|
|
- break;
|
|
|
- }
|
|
|
-
|
|
|
- /* Substitute NULL */
|
|
|
- if (free_value)
|
|
|
- free (value);
|
|
|
- goto success;
|
|
|
-
|
|
|
- case ACT_NULL_ASSIGN:
|
|
|
- if (value && *value)
|
|
|
- /* Substitute parameter */
|
|
|
- break;
|
|
|
-
|
|
|
- if (!colon_seen && value)
|
|
|
- {
|
|
|
- /* Substitute NULL */
|
|
|
- if (free_value)
|
|
|
- free (value);
|
|
|
- goto success;
|
|
|
- }
|
|
|
-
|
|
|
- if (free_value && value)
|
|
|
- free (value);
|
|
|
-
|
|
|
- value = pattern ? strdup (pattern) : pattern;
|
|
|
- free_value = 1;
|
|
|
-
|
|
|
- if (pattern && !value)
|
|
|
- goto no_space;
|
|
|
-
|
|
|
- setenv (env, value, 1);
|
|
|
- break;
|
|
|
-
|
|
|
- default:
|
|
|
- assert (! "Unrecognised action!");
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- free (env); env = NULL;
|
|
|
- free (pattern); pattern = NULL;
|
|
|
-
|
|
|
- if (seen_hash)
|
|
|
- {
|
|
|
- char param_length[21];
|
|
|
- param_length[20] = '\0';
|
|
|
- *word = w_addstr (*word, word_length, max_length,
|
|
|
- itoa_word (value ? strlen (value) : 0,
|
|
|
- ¶m_length[20], 10, 0));
|
|
|
- if (free_value)
|
|
|
- {
|
|
|
- assert (value != NULL);
|
|
|
- free (value);
|
|
|
- }
|
|
|
-
|
|
|
- return *word ? 0 : WRDE_NOSPACE;
|
|
|
- }
|
|
|
-
|
|
|
- if (value == NULL)
|
|
|
- return 0;
|
|
|
-
|
|
|
- if (quoted || !pwordexp)
|
|
|
- {
|
|
|
- /* Quoted - no field split */
|
|
|
- *word = w_addstr (*word, word_length, max_length, value);
|
|
|
- if (free_value)
|
|
|
- free (value);
|
|
|
-
|
|
|
- return *word ? 0 : WRDE_NOSPACE;
|
|
|
- }
|
|
|
- else
|
|
|
- {
|
|
|
- /* Need to field-split */
|
|
|
- char *value_copy = strdup (value); /* Don't modify value */
|
|
|
- char *field_begin = value_copy;
|
|
|
- int seen_nonws_ifs = 0;
|
|
|
-
|
|
|
- if (free_value)
|
|
|
- free (value);
|
|
|
-
|
|
|
- if (value_copy == NULL)
|
|
|
- goto no_space;
|
|
|
-
|
|
|
- do
|
|
|
- {
|
|
|
- char *field_end = field_begin;
|
|
|
- char *next_field;
|
|
|
-
|
|
|
- /* If this isn't the first field, start a new word */
|
|
|
- if (field_begin != value_copy)
|
|
|
- {
|
|
|
- if (w_addword (pwordexp, *word) == WRDE_NOSPACE)
|
|
|
- {
|
|
|
- free (value_copy);
|
|
|
- goto no_space;
|
|
|
- }
|
|
|
-
|
|
|
- *word = w_newword (word_length, max_length);
|
|
|
- }
|
|
|
-
|
|
|
- /* Skip IFS whitespace before the field */
|
|
|
- field_begin += strspn (field_begin, ifs_white);
|
|
|
-
|
|
|
- if (!seen_nonws_ifs && *field_begin == 0)
|
|
|
- /* Nothing but whitespace */
|
|
|
- break;
|
|
|
-
|
|
|
- /* Search for the end of the field */
|
|
|
- field_end = field_begin + strcspn (field_begin, ifs);
|
|
|
-
|
|
|
- /* Set up pointer to the character after end of field and
|
|
|
- skip whitespace IFS after it. */
|
|
|
- next_field = field_end + strspn (field_end, ifs_white);
|
|
|
-
|
|
|
- /* Skip at most one non-whitespace IFS character after the field */
|
|
|
- seen_nonws_ifs = 0;
|
|
|
- if (*next_field && strchr (ifs, *next_field))
|
|
|
- {
|
|
|
- seen_nonws_ifs = 1;
|
|
|
- next_field++;
|
|
|
- }
|
|
|
-
|
|
|
- /* Null-terminate it */
|
|
|
- *field_end = 0;
|
|
|
-
|
|
|
- /* Tag a copy onto the current word */
|
|
|
- *word = w_addstr (*word, word_length, max_length, field_begin);
|
|
|
-
|
|
|
- if (*word == NULL && *field_begin != '\0')
|
|
|
- {
|
|
|
- free (value_copy);
|
|
|
- goto no_space;
|
|
|
- }
|
|
|
-
|
|
|
- field_begin = next_field;
|
|
|
- }
|
|
|
- while (seen_nonws_ifs || *field_begin);
|
|
|
-
|
|
|
- free (value_copy);
|
|
|
- }
|
|
|
-
|
|
|
- return 0;
|
|
|
-
|
|
|
-success:
|
|
|
- error = 0;
|
|
|
- goto do_error;
|
|
|
-
|
|
|
-no_space:
|
|
|
- error = WRDE_NOSPACE;
|
|
|
- goto do_error;
|
|
|
-
|
|
|
-syntax:
|
|
|
- error = WRDE_SYNTAX;
|
|
|
-
|
|
|
-do_error:
|
|
|
- if (env)
|
|
|
- free (env);
|
|
|
-
|
|
|
- if (pattern)
|
|
|
- free (pattern);
|
|
|
-
|
|
|
- return error;
|
|
|
-}
|
|
|
-
|
|
|
-static int
|
|
|
-parse_dollars (char **word, size_t *word_length, size_t *max_length,
|
|
|
- const char *words, size_t *offset, int flags,
|
|
|
- wordexp_t *pwordexp, const char *ifs, const char *ifs_white,
|
|
|
- int quoted)
|
|
|
-{
|
|
|
- /* We are poised _at_ "$" */
|
|
|
- switch (words[1 + *offset])
|
|
|
- {
|
|
|
- case '"':
|
|
|
- case '\'':
|
|
|
- case 0:
|
|
|
- *word = w_addchar (*word, word_length, max_length, '$');
|
|
|
- return *word ? 0 : WRDE_NOSPACE;
|
|
|
-
|
|
|
- case '(':
|
|
|
- if (words[2 + *offset] == '(')
|
|
|
- {
|
|
|
- /* Differentiate between $((1+3)) and $((echo);(ls)) */
|
|
|
- int i = 3 + *offset;
|
|
|
- int depth = 0;
|
|
|
- while (words[i] && !(depth == 0 && words[i] == ')'))
|
|
|
- {
|
|
|
- if (words[i] == '(')
|
|
|
- ++depth;
|
|
|
- else if (words[i] == ')')
|
|
|
- --depth;
|
|
|
-
|
|
|
- ++i;
|
|
|
- }
|
|
|
-
|
|
|
- if (words[i] == ')' && words[i + 1] == ')')
|
|
|
- {
|
|
|
- (*offset) += 3;
|
|
|
- /* Call parse_arith -- 0 is for "no brackets" */
|
|
|
- return parse_arith (word, word_length, max_length, words, offset,
|
|
|
- flags, 0);
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- if (flags & WRDE_NOCMD)
|
|
|
- return WRDE_CMDSUB;
|
|
|
-
|
|
|
- (*offset) += 2;
|
|
|
- return parse_comm (word, word_length, max_length, words, offset, flags,
|
|
|
- quoted? NULL : pwordexp, ifs, ifs_white);
|
|
|
-
|
|
|
- case '[':
|
|
|
- (*offset) += 2;
|
|
|
- /* Call parse_arith -- 1 is for "brackets" */
|
|
|
- return parse_arith (word, word_length, max_length, words, offset, flags,
|
|
|
- 1);
|
|
|
-
|
|
|
- case '{':
|
|
|
- default:
|
|
|
- ++(*offset); /* parse_param needs to know if "{" is there */
|
|
|
- return parse_param (word, word_length, max_length, words, offset, flags,
|
|
|
- pwordexp, ifs, ifs_white, quoted);
|
|
|
- }
|
|
|
-}
|
|
|
-
|
|
|
-static int
|
|
|
-parse_backtick (char **word, size_t *word_length, size_t *max_length,
|
|
|
- const char *words, size_t *offset, int flags,
|
|
|
- wordexp_t *pwordexp, const char *ifs, const char *ifs_white)
|
|
|
-{
|
|
|
- /* We are poised just after "`" */
|
|
|
- int error;
|
|
|
- int squoting = 0;
|
|
|
- size_t comm_length;
|
|
|
- size_t comm_maxlen;
|
|
|
- char *comm = w_newword (&comm_length, &comm_maxlen);
|
|
|
-
|
|
|
- for (; words[*offset]; ++(*offset))
|
|
|
- {
|
|
|
- switch (words[*offset])
|
|
|
- {
|
|
|
- case '`':
|
|
|
- /* Go -- give the script to the shell */
|
|
|
- error = exec_comm (comm, word, word_length, max_length, flags,
|
|
|
- pwordexp, ifs, ifs_white);
|
|
|
- free (comm);
|
|
|
- return error;
|
|
|
-
|
|
|
- case '\\':
|
|
|
- if (squoting)
|
|
|
- {
|
|
|
- error = parse_qtd_backslash (&comm, &comm_length, &comm_maxlen,
|
|
|
- words, offset);
|
|
|
-
|
|
|
- if (error)
|
|
|
- {
|
|
|
- free (comm);
|
|
|
- return error;
|
|
|
- }
|
|
|
-
|
|
|
- break;
|
|
|
- }
|
|
|
-
|
|
|
- ++(*offset);
|
|
|
- error = parse_backslash (&comm, &comm_length, &comm_maxlen, words,
|
|
|
- offset);
|
|
|
-
|
|
|
- if (error)
|
|
|
- {
|
|
|
- free (comm);
|
|
|
- return error;
|
|
|
- }
|
|
|
-
|
|
|
- break;
|
|
|
-
|
|
|
- case '\'':
|
|
|
- squoting = 1 - squoting;
|
|
|
- default:
|
|
|
- comm = w_addchar (comm, &comm_length, &comm_maxlen, words[*offset]);
|
|
|
- if (comm == NULL)
|
|
|
- return WRDE_NOSPACE;
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- /* Premature end */
|
|
|
- free (comm);
|
|
|
- return WRDE_SYNTAX;
|
|
|
-}
|
|
|
-
|
|
|
-static int
|
|
|
-parse_dquote (char **word, size_t *word_length, size_t *max_length,
|
|
|
- const char *words, size_t *offset, int flags,
|
|
|
- wordexp_t *pwordexp, const char * ifs, const char * ifs_white)
|
|
|
-{
|
|
|
- /* We are poised just after a double-quote */
|
|
|
- int error;
|
|
|
-
|
|
|
- for (; words[*offset]; ++(*offset))
|
|
|
- {
|
|
|
- switch (words[*offset])
|
|
|
- {
|
|
|
- case '"':
|
|
|
- return 0;
|
|
|
-
|
|
|
- case '$':
|
|
|
- error = parse_dollars (word, word_length, max_length, words, offset,
|
|
|
- flags, pwordexp, ifs, ifs_white, 1);
|
|
|
- /* The ``1'' here is to tell parse_dollars not to
|
|
|
- * split the fields. It may need to, however ("$@").
|
|
|
- */
|
|
|
- if (error)
|
|
|
- return error;
|
|
|
-
|
|
|
- break;
|
|
|
-
|
|
|
- case '`':
|
|
|
- if (flags & WRDE_NOCMD)
|
|
|
- return WRDE_CMDSUB;
|
|
|
-
|
|
|
- ++(*offset);
|
|
|
- error = parse_backtick (word, word_length, max_length, words,
|
|
|
- offset, flags, NULL, NULL, NULL);
|
|
|
- /* The first NULL here is to tell parse_backtick not to
|
|
|
- * split the fields.
|
|
|
- */
|
|
|
- if (error)
|
|
|
- return error;
|
|
|
-
|
|
|
- break;
|
|
|
-
|
|
|
- case '\\':
|
|
|
- error = parse_qtd_backslash (word, word_length, max_length, words,
|
|
|
- offset);
|
|
|
-
|
|
|
- if (error)
|
|
|
- return error;
|
|
|
-
|
|
|
- break;
|
|
|
-
|
|
|
- default:
|
|
|
- *word = w_addchar (*word, word_length, max_length, words[*offset]);
|
|
|
- if (*word == NULL)
|
|
|
- return WRDE_NOSPACE;
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- /* Unterminated string */
|
|
|
- return WRDE_SYNTAX;
|
|
|
-}
|
|
|
-
|
|
|
-/*
|
|
|
- * wordfree() is to be called after pwordexp is finished with.
|
|
|
- */
|
|
|
-
|
|
|
-void
|
|
|
-wordfree (wordexp_t *pwordexp)
|
|
|
-{
|
|
|
-
|
|
|
- /* wordexp can set pwordexp to NULL */
|
|
|
- if (pwordexp && pwordexp->we_wordv)
|
|
|
- {
|
|
|
- char **wordv = pwordexp->we_wordv;
|
|
|
-
|
|
|
- for (wordv += pwordexp->we_offs; *wordv; ++wordv)
|
|
|
- free (*wordv);
|
|
|
-
|
|
|
- free (pwordexp->we_wordv);
|
|
|
- pwordexp->we_wordv = NULL;
|
|
|
- }
|
|
|
-}
|
|
|
-
|
|
|
-/*
|
|
|
- * wordexp()
|
|
|
- */
|
|
|
-
|
|
|
-int
|
|
|
-wordexp (const char *words, wordexp_t *pwordexp, int flags)
|
|
|
-{
|
|
|
- size_t words_offset;
|
|
|
- size_t word_length;
|
|
|
- size_t max_length;
|
|
|
- char *word = w_newword (&word_length, &max_length);
|
|
|
- int error;
|
|
|
- char *ifs;
|
|
|
- char ifs_white[4];
|
|
|
- wordexp_t old_word = *pwordexp;
|
|
|
-
|
|
|
- if (flags & WRDE_REUSE)
|
|
|
- {
|
|
|
- /* Minimal implementation of WRDE_REUSE for now */
|
|
|
- wordfree (pwordexp);
|
|
|
- old_word.we_wordv = NULL;
|
|
|
- }
|
|
|
-
|
|
|
- if ((flags & WRDE_APPEND) == 0)
|
|
|
- {
|
|
|
- pwordexp->we_wordc = 0;
|
|
|
-
|
|
|
- if (flags & WRDE_DOOFFS)
|
|
|
- {
|
|
|
- pwordexp->we_wordv = calloc (1 + pwordexp->we_offs, sizeof (char *));
|
|
|
- if (pwordexp->we_wordv == NULL)
|
|
|
- {
|
|
|
- error = WRDE_NOSPACE;
|
|
|
- goto do_error;
|
|
|
- }
|
|
|
- }
|
|
|
- else
|
|
|
- {
|
|
|
- pwordexp->we_wordv = calloc (1, sizeof (char *));
|
|
|
- if (pwordexp->we_wordv == NULL)
|
|
|
- {
|
|
|
- error = WRDE_NOSPACE;
|
|
|
- goto do_error;
|
|
|
- }
|
|
|
-
|
|
|
- pwordexp->we_offs = 0;
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- /* Find out what the field separators are.
|
|
|
- * There are two types: whitespace and non-whitespace.
|
|
|
- */
|
|
|
- ifs = getenv ("IFS");
|
|
|
-
|
|
|
- if (!ifs)
|
|
|
- /* IFS unset - use <space><tab><newline>. */
|
|
|
- ifs = strcpy (ifs_white, " \t\n");
|
|
|
- else
|
|
|
- {
|
|
|
- char *ifsch = ifs;
|
|
|
- char *whch = ifs_white;
|
|
|
-
|
|
|
- /* Start off with no whitespace IFS characters */
|
|
|
- ifs_white[0] = '\0';
|
|
|
-
|
|
|
- while (*ifsch != '\0')
|
|
|
- {
|
|
|
- if ((*ifsch == ' ') || (*ifsch == '\t') || (*ifsch == '\n'))
|
|
|
- {
|
|
|
- /* Whitespace IFS. See first whether it is already in our
|
|
|
- collection. */
|
|
|
- char *runp = ifs_white;
|
|
|
-
|
|
|
- while (runp < whch && *runp != '\0' && *runp != *ifsch)
|
|
|
- ++runp;
|
|
|
-
|
|
|
- if (runp == whch)
|
|
|
- *whch++ = *ifsch;
|
|
|
- }
|
|
|
-
|
|
|
- ++ifsch;
|
|
|
- }
|
|
|
- *whch = '\0';
|
|
|
- }
|
|
|
-
|
|
|
- for (words_offset = 0 ; words[words_offset] ; ++words_offset)
|
|
|
- switch (words[words_offset])
|
|
|
- {
|
|
|
- case '\\':
|
|
|
- error = parse_backslash (&word, &word_length, &max_length, words,
|
|
|
- &words_offset);
|
|
|
-
|
|
|
- if (error)
|
|
|
- goto do_error;
|
|
|
-
|
|
|
- break;
|
|
|
-
|
|
|
- case '$':
|
|
|
- error = parse_dollars (&word, &word_length, &max_length, words,
|
|
|
- &words_offset, flags, pwordexp, ifs, ifs_white,
|
|
|
- 0);
|
|
|
-
|
|
|
- if (error)
|
|
|
- goto do_error;
|
|
|
-
|
|
|
- break;
|
|
|
-
|
|
|
- case '`':
|
|
|
- if (flags & WRDE_NOCMD)
|
|
|
- {
|
|
|
- error = WRDE_CMDSUB;
|
|
|
- goto do_error;
|
|
|
- }
|
|
|
-
|
|
|
- ++words_offset;
|
|
|
- error = parse_backtick (&word, &word_length, &max_length, words,
|
|
|
- &words_offset, flags, pwordexp, ifs,
|
|
|
- ifs_white);
|
|
|
-
|
|
|
- if (error)
|
|
|
- goto do_error;
|
|
|
-
|
|
|
- break;
|
|
|
-
|
|
|
- case '"':
|
|
|
- ++words_offset;
|
|
|
- error = parse_dquote (&word, &word_length, &max_length, words,
|
|
|
- &words_offset, flags, pwordexp, ifs, ifs_white);
|
|
|
-
|
|
|
- if (error)
|
|
|
- goto do_error;
|
|
|
-
|
|
|
- if (!word_length)
|
|
|
- {
|
|
|
- error = w_addword (pwordexp, NULL);
|
|
|
-
|
|
|
- if (error)
|
|
|
- return error;
|
|
|
- }
|
|
|
-
|
|
|
- break;
|
|
|
-
|
|
|
- case '\'':
|
|
|
- ++words_offset;
|
|
|
- error = parse_squote (&word, &word_length, &max_length, words,
|
|
|
- &words_offset);
|
|
|
-
|
|
|
- if (error)
|
|
|
- goto do_error;
|
|
|
-
|
|
|
- if (!word_length)
|
|
|
- {
|
|
|
- error = w_addword (pwordexp, NULL);
|
|
|
-
|
|
|
- if (error)
|
|
|
- return error;
|
|
|
- }
|
|
|
-
|
|
|
- break;
|
|
|
-
|
|
|
- case '~':
|
|
|
- error = parse_tilde (&word, &word_length, &max_length, words,
|
|
|
- &words_offset, pwordexp->we_wordc);
|
|
|
-
|
|
|
- if (error)
|
|
|
- goto do_error;
|
|
|
-
|
|
|
- break;
|
|
|
-
|
|
|
- case '*':
|
|
|
- case '[':
|
|
|
- case '?':
|
|
|
- error = parse_glob (&word, &word_length, &max_length, words,
|
|
|
- &words_offset, flags, pwordexp, ifs, ifs_white);
|
|
|
-
|
|
|
- if (error)
|
|
|
- goto do_error;
|
|
|
-
|
|
|
- break;
|
|
|
-
|
|
|
- default:
|
|
|
- /* Is it a word separator? */
|
|
|
- if (strchr (" \t", words[words_offset]) == NULL)
|
|
|
- {
|
|
|
- char ch = words[words_offset];
|
|
|
-
|
|
|
- /* Not a word separator -- but is it a valid word char? */
|
|
|
- if (strchr ("\n|&;<>(){}", ch))
|
|
|
- {
|
|
|
- /* Fail */
|
|
|
- error = WRDE_BADCHAR;
|
|
|
- goto do_error;
|
|
|
- }
|
|
|
-
|
|
|
- /* "Ordinary" character -- add it to word */
|
|
|
- word = w_addchar (word, &word_length, &max_length,
|
|
|
- ch);
|
|
|
- if (word == NULL)
|
|
|
- {
|
|
|
- error = WRDE_NOSPACE;
|
|
|
- goto do_error;
|
|
|
- }
|
|
|
-
|
|
|
- break;
|
|
|
- }
|
|
|
-
|
|
|
- /* If a word has been delimited, add it to the list. */
|
|
|
- if (word != NULL)
|
|
|
- {
|
|
|
- error = w_addword (pwordexp, word);
|
|
|
- if (error)
|
|
|
- goto do_error;
|
|
|
- }
|
|
|
-
|
|
|
- word = w_newword (&word_length, &max_length);
|
|
|
- }
|
|
|
-
|
|
|
- /* End of string */
|
|
|
-
|
|
|
- /* There was a word separator at the end */
|
|
|
- if (word == NULL) /* i.e. w_newword */
|
|
|
- return 0;
|
|
|
-
|
|
|
- /* There was no field separator at the end */
|
|
|
- return w_addword (pwordexp, word);
|
|
|
-
|
|
|
-do_error:
|
|
|
- /* Error:
|
|
|
- * free memory used (unless error is WRDE_NOSPACE), and
|
|
|
- * set pwordexp members back to what they were.
|
|
|
- */
|
|
|
-
|
|
|
- if (word != NULL)
|
|
|
- free (word);
|
|
|
-
|
|
|
- if (error == WRDE_NOSPACE)
|
|
|
- return WRDE_NOSPACE;
|
|
|
-
|
|
|
- if ((flags & WRDE_APPEND) == 0)
|
|
|
- wordfree (pwordexp);
|
|
|
-
|
|
|
- *pwordexp = old_word;
|
|
|
- return error;
|
|
|
-}
|