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- /* Copyright (C) 1991, 1993, 1994 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Library General Public License as
- published by the Free Software Foundation; either version 2 of the
- License, or (at your option) any later version.
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Library General Public License for more details.
- You should have received a copy of the GNU Library General Public
- License along with the GNU C Library; see the file COPYING.LIB. If
- not, write to the Free Software Foundation, Inc., 675 Mass Ave,
- Cambridge, MA 02139, USA. */
- /*
- * Manuel Novoa III Dec 2000
- *
- * Converted to use my new (un)signed long (long) to string routines, which
- * are smaller than the previous functions and don't require static buffers.
- * Removed dependence on strcat in the process.
- *
- * Also appended a test routine ( -DCHECK_BUF ) to allow a quick check
- * on the buffer length when the sys_errorlist is modified.
- *
- * Added the option WANT_ERRORLIST for low-memory applications to omit the
- * error message strings and only output the error number.
- *
- * Manuel Novoa III Feb 2002
- *
- * Change to _int10tostr and fix a bug in end-of-buf arg.
- *
- * Erik Andersen June 2002
- *
- * Added strerror_r (per SuSv3 which differs from glibc) and adapted
- * strerror to match.
- */
- #define WANT_ERRORLIST 1
- #define _STDIO_UTILITY /* For _int10tostr. */
- #include <stdio.h>
- #include <string.h>
- #include <errno.h>
- int strerror_r(int err, char *retbuf, size_t buflen)
- {
- #if WANT_ERRORLIST
- if (err < 0 || err >= sys_nerr || sys_errlist[err] == NULL) {
- return -EINVAL;
- }
- if (retbuf==NULL || buflen < 1) {
- return -ERANGE;
- }
- strncpy(retbuf, sys_errlist[err], buflen);
- retbuf[buflen-1] = '\0';
- return 0;
- #else
- char *pos;
- static const char unknown_error[] = "Unknown Error: errno"; /* = */
- if (err < 0 || err >= sys_nerr || sys_errlist[err] == NULL) {
- return -EINVAL;
- }
- /* unknown error -- leave space for the '=' */
- pos = _int10tostr(retbuf+sizeof(retbuf)-1, err) - sizeof(unknown_error);
- strcpy(pos, unknown_error);
- *(pos + sizeof(unknown_error) - 1) = '=';
- return 0;
- #endif
- }
- /* Return a string descibing the errno code in ERRNUM.
- The storage is good only until the next call to strerror.
- Writing to the storage causes undefined behavior. */
- char *strerror(int err)
- {
- #if WANT_ERRORLIST
- static char retbuf[48];
- #else
- #if __BUFLEN_INT10TOSTR > 12
- #error currently set up for 32 bit ints max!
- #endif
- static char retbuf[33]; /* 33 is sufficient for 32 bit ints */
- #endif
-
- if (strerror_r(err, retbuf, sizeof(retbuf)) != 0) {
- return NULL;
- }
- return(retbuf);
- }
- #ifdef CHECK_BUF
- /* quick way to check buffer length */
- #include <stdio.h>
- #include <stdlib.h>
- int main(void)
- {
- int max = 0;
- int j, retcode;
- char *p;
- #if WANT_ERRORLIST
- int i;
- #endif
- retcode = EXIT_SUCCESS;
- #if WANT_ERRORLIST
- for ( i=0 ; i < sys_nerr ; i++ ) {
- j = strlen(sys_errlist[i])+1;
- if (j > max) max = j;
- }
- #endif
- p = strerror(INT_MIN);
- j = retbuf+sizeof(retbuf) - p;
- if ( > max) {
- max = j;
- printf("strerror.c - Test of INT_MIN: <%s> %d\n", p, j);
- }
- if (sizeof(retbuf) != max) {
- printf("Error: strerror.c - dimension of retbuf should be = %d\n", max);
- retcode = EXIT_FAILURE;
- }
- printf("Passed.\n");
- return retcode;
- }
- #endif
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