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- /*
- * Copyright (c) 2002 - 2014 Tony Finch <dot@dotat.at>
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
- /*
- * unifdef - remove ifdef'ed lines
- *
- * This code was derived from software contributed to Berkeley by Dave Yost.
- * It was rewritten to support ANSI C by Tony Finch. The original version
- * of unifdef carried the 4-clause BSD copyright licence. None of its code
- * remains in this version (though some of the names remain) so it now
- * carries a more liberal licence.
- *
- * Wishlist:
- * provide an option which will append the name of the
- * appropriate symbol after #else's and #endif's
- * provide an option which will check symbols after
- * #else's and #endif's to see that they match their
- * corresponding #ifdef or #ifndef
- *
- * These require better buffer handling, which would also make
- * it possible to handle all "dodgy" directives correctly.
- */
- #include "unifdef.h"
- static const char copyright[] =
- #include "version.h"
- "@(#) $Author: Tony Finch (dot@dotat.at) $\n"
- "@(#) $URL: http://dotat.at/prog/unifdef $\n"
- ;
- /* types of input lines: */
- typedef enum {
- LT_TRUEI, /* a true #if with ignore flag */
- LT_FALSEI, /* a false #if with ignore flag */
- LT_IF, /* an unknown #if */
- LT_TRUE, /* a true #if */
- LT_FALSE, /* a false #if */
- LT_ELIF, /* an unknown #elif */
- LT_ELTRUE, /* a true #elif */
- LT_ELFALSE, /* a false #elif */
- LT_ELSE, /* #else */
- LT_ENDIF, /* #endif */
- LT_DODGY, /* flag: directive is not on one line */
- LT_DODGY_LAST = LT_DODGY + LT_ENDIF,
- LT_PLAIN, /* ordinary line */
- LT_EOF, /* end of file */
- LT_ERROR, /* unevaluable #if */
- LT_COUNT
- } Linetype;
- static char const * const linetype_name[] = {
- "TRUEI", "FALSEI", "IF", "TRUE", "FALSE",
- "ELIF", "ELTRUE", "ELFALSE", "ELSE", "ENDIF",
- "DODGY TRUEI", "DODGY FALSEI",
- "DODGY IF", "DODGY TRUE", "DODGY FALSE",
- "DODGY ELIF", "DODGY ELTRUE", "DODGY ELFALSE",
- "DODGY ELSE", "DODGY ENDIF",
- "PLAIN", "EOF", "ERROR"
- };
- #define linetype_if2elif(lt) ((Linetype)(lt - LT_IF + LT_ELIF))
- #define linetype_2dodgy(lt) ((Linetype)(lt + LT_DODGY))
- /* state of #if processing */
- typedef enum {
- IS_OUTSIDE,
- IS_FALSE_PREFIX, /* false #if followed by false #elifs */
- IS_TRUE_PREFIX, /* first non-false #(el)if is true */
- IS_PASS_MIDDLE, /* first non-false #(el)if is unknown */
- IS_FALSE_MIDDLE, /* a false #elif after a pass state */
- IS_TRUE_MIDDLE, /* a true #elif after a pass state */
- IS_PASS_ELSE, /* an else after a pass state */
- IS_FALSE_ELSE, /* an else after a true state */
- IS_TRUE_ELSE, /* an else after only false states */
- IS_FALSE_TRAILER, /* #elifs after a true are false */
- IS_COUNT
- } Ifstate;
- static char const * const ifstate_name[] = {
- "OUTSIDE", "FALSE_PREFIX", "TRUE_PREFIX",
- "PASS_MIDDLE", "FALSE_MIDDLE", "TRUE_MIDDLE",
- "PASS_ELSE", "FALSE_ELSE", "TRUE_ELSE",
- "FALSE_TRAILER"
- };
- /* state of comment parser */
- typedef enum {
- NO_COMMENT = false, /* outside a comment */
- C_COMMENT, /* in a comment like this one */
- CXX_COMMENT, /* between // and end of line */
- STARTING_COMMENT, /* just after slash-backslash-newline */
- FINISHING_COMMENT, /* star-backslash-newline in a C comment */
- CHAR_LITERAL, /* inside '' */
- STRING_LITERAL /* inside "" */
- } Comment_state;
- static char const * const comment_name[] = {
- "NO", "C", "CXX", "STARTING", "FINISHING", "CHAR", "STRING"
- };
- /* state of preprocessor line parser */
- typedef enum {
- LS_START, /* only space and comments on this line */
- LS_HASH, /* only space, comments, and a hash */
- LS_DIRTY /* this line can't be a preprocessor line */
- } Line_state;
- static char const * const linestate_name[] = {
- "START", "HASH", "DIRTY"
- };
- /*
- * Minimum translation limits from ISO/IEC 9899:1999 5.2.4.1
- */
- #define MAXDEPTH 64 /* maximum #if nesting */
- #define MAXLINE 4096 /* maximum length of line */
- #define MAXSYMS 16384 /* maximum number of symbols */
- /*
- * Sometimes when editing a keyword the replacement text is longer, so
- * we leave some space at the end of the tline buffer to accommodate this.
- */
- #define EDITSLOP 10
- /*
- * Globals.
- */
- static bool compblank; /* -B: compress blank lines */
- static bool lnblank; /* -b: blank deleted lines */
- static bool complement; /* -c: do the complement */
- static bool debugging; /* -d: debugging reports */
- static bool inplace; /* -m: modify in place */
- static bool iocccok; /* -e: fewer IOCCC errors */
- static bool strictlogic; /* -K: keep ambiguous #ifs */
- static bool killconsts; /* -k: eval constant #ifs */
- static bool lnnum; /* -n: add #line directives */
- static bool symlist; /* -s: output symbol list */
- static bool symdepth; /* -S: output symbol depth */
- static bool text; /* -t: this is a text file */
- static const char *symname[MAXSYMS]; /* symbol name */
- static const char *value[MAXSYMS]; /* -Dsym=value */
- static bool ignore[MAXSYMS]; /* -iDsym or -iUsym */
- static int nsyms; /* number of symbols */
- static FILE *input; /* input file pointer */
- static const char *filename; /* input file name */
- static int linenum; /* current line number */
- static const char *linefile; /* file name for #line */
- static FILE *output; /* output file pointer */
- static const char *ofilename; /* output file name */
- static const char *backext; /* backup extension */
- static char *tempname; /* avoid splatting input */
- static char tline[MAXLINE+EDITSLOP];/* input buffer plus space */
- static char *keyword; /* used for editing #elif's */
- /*
- * When processing a file, the output's newline style will match the
- * input's, and unifdef correctly handles CRLF or LF endings whatever
- * the platform's native style. The stdio streams are opened in binary
- * mode to accommodate platforms whose native newline style is CRLF.
- * When the output isn't a processed input file (when it is error /
- * debug / diagnostic messages) then unifdef uses native line endings.
- */
- static const char *newline; /* input file format */
- static const char newline_unix[] = "\n";
- static const char newline_crlf[] = "\r\n";
- static Comment_state incomment; /* comment parser state */
- static Line_state linestate; /* #if line parser state */
- static Ifstate ifstate[MAXDEPTH]; /* #if processor state */
- static bool ignoring[MAXDEPTH]; /* ignore comments state */
- static int stifline[MAXDEPTH]; /* start of current #if */
- static int depth; /* current #if nesting */
- static int delcount; /* count of deleted lines */
- static unsigned blankcount; /* count of blank lines */
- static unsigned blankmax; /* maximum recent blankcount */
- static bool constexpr; /* constant #if expression */
- static bool zerosyms; /* to format symdepth output */
- static bool firstsym; /* ditto */
- static int exitmode; /* exit status mode */
- static int exitstat; /* program exit status */
- static bool altered; /* was this file modified? */
- static void addsym1(bool, bool, char *);
- static void addsym2(bool, const char *, const char *);
- static char *astrcat(const char *, const char *);
- static void cleantemp(void);
- static void closeio(void);
- static void debug(const char *, ...);
- static void debugsym(const char *, int);
- static bool defundef(void);
- static void defundefile(const char *);
- static void done(void);
- static void error(const char *);
- static int findsym(const char **);
- static void flushline(bool);
- static void hashline(void);
- static void help(void);
- static Linetype ifeval(const char **);
- static void ignoreoff(void);
- static void ignoreon(void);
- static void indirectsym(void);
- static void keywordedit(const char *);
- static const char *matchsym(const char *, const char *);
- static void nest(void);
- static Linetype parseline(void);
- static void process(void);
- static void processinout(const char *, const char *);
- static const char *skipargs(const char *);
- static const char *skipcomment(const char *);
- static const char *skiphash(void);
- static const char *skipline(const char *);
- static const char *skipsym(const char *);
- static void state(Ifstate);
- static void unnest(void);
- static void usage(void);
- static void version(void);
- static const char *xstrdup(const char *, const char *);
- #define endsym(c) (!isalnum((unsigned char)c) && c != '_')
- /*
- * The main program.
- */
- int
- main(int argc, char *argv[])
- {
- int opt;
- while ((opt = getopt(argc, argv, "i:D:U:f:I:M:o:x:bBcdehKklmnsStV")) != -1)
- switch (opt) {
- case 'i': /* treat stuff controlled by these symbols as text */
- /*
- * For strict backwards-compatibility the U or D
- * should be immediately after the -i but it doesn't
- * matter much if we relax that requirement.
- */
- opt = *optarg++;
- if (opt == 'D')
- addsym1(true, true, optarg);
- else if (opt == 'U')
- addsym1(true, false, optarg);
- else
- usage();
- break;
- case 'D': /* define a symbol */
- addsym1(false, true, optarg);
- break;
- case 'U': /* undef a symbol */
- addsym1(false, false, optarg);
- break;
- case 'I': /* no-op for compatibility with cpp */
- break;
- case 'b': /* blank deleted lines instead of omitting them */
- case 'l': /* backwards compatibility */
- lnblank = true;
- break;
- case 'B': /* compress blank lines around removed section */
- compblank = true;
- break;
- case 'c': /* treat -D as -U and vice versa */
- complement = true;
- break;
- case 'd':
- debugging = true;
- break;
- case 'e': /* fewer errors from dodgy lines */
- iocccok = true;
- break;
- case 'f': /* definitions file */
- defundefile(optarg);
- break;
- case 'h':
- help();
- break;
- case 'K': /* keep ambiguous #ifs */
- strictlogic = true;
- break;
- case 'k': /* process constant #ifs */
- killconsts = true;
- break;
- case 'm': /* modify in place */
- inplace = true;
- break;
- case 'M': /* modify in place and keep backup */
- inplace = true;
- backext = optarg;
- break;
- case 'n': /* add #line directive after deleted lines */
- lnnum = true;
- break;
- case 'o': /* output to a file */
- ofilename = optarg;
- break;
- case 's': /* only output list of symbols that control #ifs */
- symlist = true;
- break;
- case 'S': /* list symbols with their nesting depth */
- symlist = symdepth = true;
- break;
- case 't': /* don't parse C comments */
- text = true;
- break;
- case 'V':
- version();
- break;
- case 'x':
- exitmode = atoi(optarg);
- if(exitmode < 0 || exitmode > 2)
- usage();
- break;
- default:
- usage();
- }
- argc -= optind;
- argv += optind;
- if (compblank && lnblank)
- errx(2, "-B and -b are mutually exclusive");
- if (symlist && (ofilename != NULL || inplace || argc > 1))
- errx(2, "-s only works with one input file");
- if (argc > 1 && ofilename != NULL)
- errx(2, "-o cannot be used with multiple input files");
- if (argc > 1 && !inplace)
- errx(2, "multiple input files require -m or -M");
- if (argc == 0)
- argc = 1;
- if (argc == 1 && !inplace && ofilename == NULL)
- ofilename = "-";
- indirectsym();
- atexit(cleantemp);
- if (ofilename != NULL)
- processinout(*argv, ofilename);
- else while (argc-- > 0) {
- processinout(*argv, *argv);
- argv++;
- }
- switch(exitmode) {
- case(0): exit(exitstat);
- case(1): exit(!exitstat);
- case(2): exit(0);
- default: abort(); /* bug */
- }
- }
- /*
- * File logistics.
- */
- static void
- processinout(const char *ifn, const char *ofn)
- {
- struct stat st;
- if (ifn == NULL || strcmp(ifn, "-") == 0) {
- filename = "[stdin]";
- linefile = NULL;
- input = fbinmode(stdin);
- } else {
- filename = ifn;
- linefile = ifn;
- input = fopen(ifn, "rb");
- if (input == NULL)
- err(2, "can't open %s", ifn);
- }
- if (strcmp(ofn, "-") == 0) {
- output = fbinmode(stdout);
- process();
- return;
- }
- if (stat(ofn, &st) < 0) {
- output = fopen(ofn, "wb");
- if (output == NULL)
- err(2, "can't create %s", ofn);
- process();
- return;
- }
- tempname = astrcat(ofn, ".XXXXXX");
- output = mktempmode(tempname, st.st_mode);
- if (output == NULL)
- err(2, "can't create %s", tempname);
- process();
- if (backext != NULL) {
- char *backname = astrcat(ofn, backext);
- if (rename(ofn, backname) < 0)
- err(2, "can't rename \"%s\" to \"%s\"", ofn, backname);
- free(backname);
- }
- /* leave file unmodified if unifdef made no changes */
- if (!altered && backext == NULL) {
- if (remove(tempname) < 0)
- warn("can't remove \"%s\"", tempname);
- } else if (replace(tempname, ofn) < 0)
- err(2, "can't rename \"%s\" to \"%s\"", tempname, ofn);
- free(tempname);
- tempname = NULL;
- }
- /*
- * For cleaning up if there is an error.
- */
- static void
- cleantemp(void)
- {
- if (tempname != NULL)
- remove(tempname);
- }
- /*
- * Self-identification functions.
- */
- static void
- version(void)
- {
- const char *c = copyright;
- for (;;) {
- while (*++c != '$')
- if (*c == '\0')
- exit(0);
- while (*++c != '$')
- putc(*c, stderr);
- putc('\n', stderr);
- }
- }
- static void
- synopsis(FILE *fp)
- {
- fprintf(fp,
- "usage: unifdef [-bBcdehKkmnsStV] [-x{012}] [-Mext] [-opath] \\\n"
- " [-[i]Dsym[=val]] [-[i]Usym] [-fpath] ... [file] ...\n");
- }
- static void
- usage(void)
- {
- synopsis(stderr);
- exit(2);
- }
- static void
- help(void)
- {
- synopsis(stdout);
- printf(
- " -Dsym=val define preprocessor symbol with given value\n"
- " -Dsym define preprocessor symbol with value 1\n"
- " -Usym preprocessor symbol is undefined\n"
- " -iDsym=val \\ ignore C strings and comments\n"
- " -iDsym ) in sections controlled by these\n"
- " -iUsym / preprocessor symbols\n"
- " -fpath file containing #define and #undef directives\n"
- " -b blank lines instead of deleting them\n"
- " -B compress blank lines around deleted section\n"
- " -c complement (invert) keep vs. delete\n"
- " -d debugging mode\n"
- " -e ignore multiline preprocessor directives\n"
- " -h print help\n"
- " -Ipath extra include file path (ignored)\n"
- " -K disable && and || short-circuiting\n"
- " -k process constant #if expressions\n"
- " -Mext modify in place and keep backups\n"
- " -m modify input files in place\n"
- " -n add #line directives to output\n"
- " -opath output file name\n"
- " -S list #if control symbols with nesting\n"
- " -s list #if control symbols\n"
- " -t ignore C strings and comments\n"
- " -V print version\n"
- " -x{012} exit status mode\n"
- );
- exit(0);
- }
- /*
- * A state transition function alters the global #if processing state
- * in a particular way. The table below is indexed by the current
- * processing state and the type of the current line.
- *
- * Nesting is handled by keeping a stack of states; some transition
- * functions increase or decrease the depth. They also maintain the
- * ignore state on a stack. In some complicated cases they have to
- * alter the preprocessor directive, as follows.
- *
- * When we have processed a group that starts off with a known-false
- * #if/#elif sequence (which has therefore been deleted) followed by a
- * #elif that we don't understand and therefore must keep, we edit the
- * latter into a #if to keep the nesting correct. We use memcpy() to
- * overwrite the 4 byte token "elif" with "if " without a '\0' byte.
- *
- * When we find a true #elif in a group, the following block will
- * always be kept and the rest of the sequence after the next #elif or
- * #else will be discarded. We edit the #elif into a #else and the
- * following directive to #endif since this has the desired behaviour.
- *
- * "Dodgy" directives are split across multiple lines, the most common
- * example being a multi-line comment hanging off the right of the
- * directive. We can handle them correctly only if there is no change
- * from printing to dropping (or vice versa) caused by that directive.
- * If the directive is the first of a group we have a choice between
- * failing with an error, or passing it through unchanged instead of
- * evaluating it. The latter is not the default to avoid questions from
- * users about unifdef unexpectedly leaving behind preprocessor directives.
- */
- typedef void state_fn(void);
- /* report an error */
- static void Eelif (void) { error("Inappropriate #elif"); }
- static void Eelse (void) { error("Inappropriate #else"); }
- static void Eendif(void) { error("Inappropriate #endif"); }
- static void Eeof (void) { error("Premature EOF"); }
- static void Eioccc(void) { error("Obfuscated preprocessor control line"); }
- /* plain line handling */
- static void print (void) { flushline(true); }
- static void drop (void) { flushline(false); }
- /* output lacks group's start line */
- static void Strue (void) { drop(); ignoreoff(); state(IS_TRUE_PREFIX); }
- static void Sfalse(void) { drop(); ignoreoff(); state(IS_FALSE_PREFIX); }
- static void Selse (void) { drop(); state(IS_TRUE_ELSE); }
- /* print/pass this block */
- static void Pelif (void) { print(); ignoreoff(); state(IS_PASS_MIDDLE); }
- static void Pelse (void) { print(); state(IS_PASS_ELSE); }
- static void Pendif(void) { print(); unnest(); }
- /* discard this block */
- static void Dfalse(void) { drop(); ignoreoff(); state(IS_FALSE_TRAILER); }
- static void Delif (void) { drop(); ignoreoff(); state(IS_FALSE_MIDDLE); }
- static void Delse (void) { drop(); state(IS_FALSE_ELSE); }
- static void Dendif(void) { drop(); unnest(); }
- /* first line of group */
- static void Fdrop (void) { nest(); Dfalse(); }
- static void Fpass (void) { nest(); Pelif(); }
- static void Ftrue (void) { nest(); Strue(); }
- static void Ffalse(void) { nest(); Sfalse(); }
- /* variable pedantry for obfuscated lines */
- static void Oiffy (void) { if (!iocccok) Eioccc(); Fpass(); ignoreon(); }
- static void Oif (void) { if (!iocccok) Eioccc(); Fpass(); }
- static void Oelif (void) { if (!iocccok) Eioccc(); Pelif(); }
- /* ignore comments in this block */
- static void Idrop (void) { Fdrop(); ignoreon(); }
- static void Itrue (void) { Ftrue(); ignoreon(); }
- static void Ifalse(void) { Ffalse(); ignoreon(); }
- /* modify this line */
- static void Mpass (void) { memcpy(keyword, "if ", 4); Pelif(); }
- static void Mtrue (void) { keywordedit("else"); state(IS_TRUE_MIDDLE); }
- static void Melif (void) { keywordedit("endif"); state(IS_FALSE_TRAILER); }
- static void Melse (void) { keywordedit("endif"); state(IS_FALSE_ELSE); }
- static state_fn * const trans_table[IS_COUNT][LT_COUNT] = {
- /* IS_OUTSIDE */
- { Itrue, Ifalse,Fpass, Ftrue, Ffalse,Eelif, Eelif, Eelif, Eelse, Eendif,
- Oiffy, Oiffy, Fpass, Oif, Oif, Eelif, Eelif, Eelif, Eelse, Eendif,
- print, done, abort },
- /* IS_FALSE_PREFIX */
- { Idrop, Idrop, Fdrop, Fdrop, Fdrop, Mpass, Strue, Sfalse,Selse, Dendif,
- Idrop, Idrop, Fdrop, Fdrop, Fdrop, Mpass, Eioccc,Eioccc,Eioccc,Eioccc,
- drop, Eeof, abort },
- /* IS_TRUE_PREFIX */
- { Itrue, Ifalse,Fpass, Ftrue, Ffalse,Dfalse,Dfalse,Dfalse,Delse, Dendif,
- Oiffy, Oiffy, Fpass, Oif, Oif, Eioccc,Eioccc,Eioccc,Eioccc,Eioccc,
- print, Eeof, abort },
- /* IS_PASS_MIDDLE */
- { Itrue, Ifalse,Fpass, Ftrue, Ffalse,Pelif, Mtrue, Delif, Pelse, Pendif,
- Oiffy, Oiffy, Fpass, Oif, Oif, Pelif, Oelif, Oelif, Pelse, Pendif,
- print, Eeof, abort },
- /* IS_FALSE_MIDDLE */
- { Idrop, Idrop, Fdrop, Fdrop, Fdrop, Pelif, Mtrue, Delif, Pelse, Pendif,
- Idrop, Idrop, Fdrop, Fdrop, Fdrop, Eioccc,Eioccc,Eioccc,Eioccc,Eioccc,
- drop, Eeof, abort },
- /* IS_TRUE_MIDDLE */
- { Itrue, Ifalse,Fpass, Ftrue, Ffalse,Melif, Melif, Melif, Melse, Pendif,
- Oiffy, Oiffy, Fpass, Oif, Oif, Eioccc,Eioccc,Eioccc,Eioccc,Pendif,
- print, Eeof, abort },
- /* IS_PASS_ELSE */
- { Itrue, Ifalse,Fpass, Ftrue, Ffalse,Eelif, Eelif, Eelif, Eelse, Pendif,
- Oiffy, Oiffy, Fpass, Oif, Oif, Eelif, Eelif, Eelif, Eelse, Pendif,
- print, Eeof, abort },
- /* IS_FALSE_ELSE */
- { Idrop, Idrop, Fdrop, Fdrop, Fdrop, Eelif, Eelif, Eelif, Eelse, Dendif,
- Idrop, Idrop, Fdrop, Fdrop, Fdrop, Eelif, Eelif, Eelif, Eelse, Eioccc,
- drop, Eeof, abort },
- /* IS_TRUE_ELSE */
- { Itrue, Ifalse,Fpass, Ftrue, Ffalse,Eelif, Eelif, Eelif, Eelse, Dendif,
- Oiffy, Oiffy, Fpass, Oif, Oif, Eelif, Eelif, Eelif, Eelse, Eioccc,
- print, Eeof, abort },
- /* IS_FALSE_TRAILER */
- { Idrop, Idrop, Fdrop, Fdrop, Fdrop, Dfalse,Dfalse,Dfalse,Delse, Dendif,
- Idrop, Idrop, Fdrop, Fdrop, Fdrop, Dfalse,Dfalse,Dfalse,Delse, Eioccc,
- drop, Eeof, abort }
- /*TRUEI FALSEI IF TRUE FALSE ELIF ELTRUE ELFALSE ELSE ENDIF
- TRUEI FALSEI IF TRUE FALSE ELIF ELTRUE ELFALSE ELSE ENDIF (DODGY)
- PLAIN EOF ERROR */
- };
- /*
- * State machine utility functions
- */
- static void
- ignoreoff(void)
- {
- if (depth == 0)
- abort(); /* bug */
- ignoring[depth] = ignoring[depth-1];
- }
- static void
- ignoreon(void)
- {
- ignoring[depth] = true;
- }
- static void
- keywordedit(const char *replacement)
- {
- snprintf(keyword, tline + sizeof(tline) - keyword,
- "%s%s", replacement, newline);
- altered = true;
- print();
- }
- static void
- nest(void)
- {
- if (depth > MAXDEPTH-1)
- abort(); /* bug */
- if (depth == MAXDEPTH-1)
- error("Too many levels of nesting");
- depth += 1;
- stifline[depth] = linenum;
- }
- static void
- unnest(void)
- {
- if (depth == 0)
- abort(); /* bug */
- depth -= 1;
- }
- static void
- state(Ifstate is)
- {
- ifstate[depth] = is;
- }
- /*
- * The last state transition function. When this is called,
- * lineval == LT_EOF, so the process() loop will terminate.
- */
- static void
- done(void)
- {
- if (incomment)
- error("EOF in comment");
- closeio();
- }
- /*
- * Write a line to the output or not, according to command line options.
- * If writing fails, closeio() will print the error and exit.
- */
- static void
- flushline(bool keep)
- {
- if (symlist)
- return;
- if (keep ^ complement) {
- bool blankline = tline[strspn(tline, " \t\r\n")] == '\0';
- if (blankline && compblank && blankcount != blankmax) {
- delcount += 1;
- blankcount += 1;
- } else {
- if (lnnum && delcount > 0)
- hashline();
- if (fputs(tline, output) == EOF)
- closeio();
- delcount = 0;
- blankmax = blankcount = blankline ? blankcount + 1 : 0;
- }
- } else {
- if (lnblank && fputs(newline, output) == EOF)
- closeio();
- altered = true;
- delcount += 1;
- blankcount = 0;
- }
- if (debugging && fflush(output) == EOF)
- closeio();
- }
- /*
- * Format of #line directives depends on whether we know the input filename.
- */
- static void
- hashline(void)
- {
- int e;
- if (linefile == NULL)
- e = fprintf(output, "#line %d%s", linenum, newline);
- else
- e = fprintf(output, "#line %d \"%s\"%s",
- linenum, linefile, newline);
- if (e < 0)
- closeio();
- }
- /*
- * Flush the output and handle errors.
- */
- static void
- closeio(void)
- {
- /* Tidy up after findsym(). */
- if (symdepth && !zerosyms)
- printf("\n");
- if (output != NULL && (ferror(output) || fclose(output) == EOF))
- err(2, "%s: can't write to output", filename);
- fclose(input);
- }
- /*
- * The driver for the state machine.
- */
- static void
- process(void)
- {
- Linetype lineval = LT_PLAIN;
- /* When compressing blank lines, act as if the file
- is preceded by a large number of blank lines. */
- blankmax = blankcount = 1000;
- zerosyms = true;
- newline = NULL;
- linenum = 0;
- altered = false;
- while (lineval != LT_EOF) {
- lineval = parseline();
- trans_table[ifstate[depth]][lineval]();
- debug("process line %d %s -> %s depth %d",
- linenum, linetype_name[lineval],
- ifstate_name[ifstate[depth]], depth);
- }
- exitstat |= altered;
- }
- /*
- * Parse a line and determine its type. We keep the preprocessor line
- * parser state between calls in the global variable linestate, with
- * help from skipcomment().
- */
- static Linetype
- parseline(void)
- {
- const char *cp;
- int cursym;
- Linetype retval;
- Comment_state wascomment;
- wascomment = incomment;
- cp = skiphash();
- if (cp == NULL)
- return (LT_EOF);
- if (newline == NULL) {
- if (strrchr(tline, '\n') == strrchr(tline, '\r') + 1)
- newline = newline_crlf;
- else
- newline = newline_unix;
- }
- if (*cp == '\0') {
- retval = LT_PLAIN;
- goto done;
- }
- keyword = tline + (cp - tline);
- if ((cp = matchsym("ifdef", keyword)) != NULL ||
- (cp = matchsym("ifndef", keyword)) != NULL) {
- cp = skipcomment(cp);
- if ((cursym = findsym(&cp)) < 0)
- retval = LT_IF;
- else {
- retval = (keyword[2] == 'n')
- ? LT_FALSE : LT_TRUE;
- if (value[cursym] == NULL)
- retval = (retval == LT_TRUE)
- ? LT_FALSE : LT_TRUE;
- if (ignore[cursym])
- retval = (retval == LT_TRUE)
- ? LT_TRUEI : LT_FALSEI;
- }
- } else if ((cp = matchsym("if", keyword)) != NULL)
- retval = ifeval(&cp);
- else if ((cp = matchsym("elif", keyword)) != NULL)
- retval = linetype_if2elif(ifeval(&cp));
- else if ((cp = matchsym("else", keyword)) != NULL)
- retval = LT_ELSE;
- else if ((cp = matchsym("endif", keyword)) != NULL)
- retval = LT_ENDIF;
- else {
- cp = skipsym(keyword);
- /* no way can we deal with a continuation inside a keyword */
- if (strncmp(cp, "\\\r\n", 3) == 0 ||
- strncmp(cp, "\\\n", 2) == 0)
- Eioccc();
- cp = skipline(cp);
- retval = LT_PLAIN;
- goto done;
- }
- cp = skipcomment(cp);
- if (*cp != '\0') {
- cp = skipline(cp);
- if (retval == LT_TRUE || retval == LT_FALSE ||
- retval == LT_TRUEI || retval == LT_FALSEI)
- retval = LT_IF;
- if (retval == LT_ELTRUE || retval == LT_ELFALSE)
- retval = LT_ELIF;
- }
- /* the following can happen if the last line of the file lacks a
- newline or if there is too much whitespace in a directive */
- if (linestate == LS_HASH) {
- long len = cp - tline;
- if (fgets(tline + len, MAXLINE - len, input) == NULL) {
- if (ferror(input))
- err(2, "can't read %s", filename);
- /* append the missing newline at eof */
- strcpy(tline + len, newline);
- cp += strlen(newline);
- linestate = LS_START;
- } else {
- linestate = LS_DIRTY;
- }
- }
- if (retval != LT_PLAIN && (wascomment || linestate != LS_START)) {
- retval = linetype_2dodgy(retval);
- linestate = LS_DIRTY;
- }
- done:
- debug("parser line %d state %s comment %s line", linenum,
- comment_name[incomment], linestate_name[linestate]);
- return (retval);
- }
- /*
- * These are the binary operators that are supported by the expression
- * evaluator.
- */
- static Linetype op_strict(long *p, long v, Linetype at, Linetype bt) {
- if(at == LT_IF || bt == LT_IF) return (LT_IF);
- return (*p = v, v ? LT_TRUE : LT_FALSE);
- }
- static Linetype op_lt(long *p, Linetype at, long a, Linetype bt, long b) {
- return op_strict(p, a < b, at, bt);
- }
- static Linetype op_gt(long *p, Linetype at, long a, Linetype bt, long b) {
- return op_strict(p, a > b, at, bt);
- }
- static Linetype op_le(long *p, Linetype at, long a, Linetype bt, long b) {
- return op_strict(p, a <= b, at, bt);
- }
- static Linetype op_ge(long *p, Linetype at, long a, Linetype bt, long b) {
- return op_strict(p, a >= b, at, bt);
- }
- static Linetype op_eq(long *p, Linetype at, long a, Linetype bt, long b) {
- return op_strict(p, a == b, at, bt);
- }
- static Linetype op_ne(long *p, Linetype at, long a, Linetype bt, long b) {
- return op_strict(p, a != b, at, bt);
- }
- static Linetype op_or(long *p, Linetype at, long a, Linetype bt, long b) {
- if (!strictlogic && (at == LT_TRUE || bt == LT_TRUE))
- return (*p = 1, LT_TRUE);
- return op_strict(p, a || b, at, bt);
- }
- static Linetype op_and(long *p, Linetype at, long a, Linetype bt, long b) {
- if (!strictlogic && (at == LT_FALSE || bt == LT_FALSE))
- return (*p = 0, LT_FALSE);
- return op_strict(p, a && b, at, bt);
- }
- /*
- * An evaluation function takes three arguments, as follows: (1) a pointer to
- * an element of the precedence table which lists the operators at the current
- * level of precedence; (2) a pointer to an integer which will receive the
- * value of the expression; and (3) a pointer to a char* that points to the
- * expression to be evaluated and that is updated to the end of the expression
- * when evaluation is complete. The function returns LT_FALSE if the value of
- * the expression is zero, LT_TRUE if it is non-zero, LT_IF if the expression
- * depends on an unknown symbol, or LT_ERROR if there is a parse failure.
- */
- struct ops;
- typedef Linetype eval_fn(const struct ops *, long *, const char **);
- static eval_fn eval_table, eval_unary;
- /*
- * The precedence table. Expressions involving binary operators are evaluated
- * in a table-driven way by eval_table. When it evaluates a subexpression it
- * calls the inner function with its first argument pointing to the next
- * element of the table. Innermost expressions have special non-table-driven
- * handling.
- */
- struct op {
- const char *str;
- Linetype (*fn)(long *, Linetype, long, Linetype, long);
- };
- struct ops {
- eval_fn *inner;
- struct op op[5];
- };
- static const struct ops eval_ops[] = {
- { eval_table, { { "||", op_or } } },
- { eval_table, { { "&&", op_and } } },
- { eval_table, { { "==", op_eq },
- { "!=", op_ne } } },
- { eval_unary, { { "<=", op_le },
- { ">=", op_ge },
- { "<", op_lt },
- { ">", op_gt } } }
- };
- /* Current operator precedence level */
- static long prec(const struct ops *ops)
- {
- return (ops - eval_ops);
- }
- /*
- * Function for evaluating the innermost parts of expressions,
- * viz. !expr (expr) number defined(symbol) symbol
- * We reset the constexpr flag in the last two cases.
- */
- static Linetype
- eval_unary(const struct ops *ops, long *valp, const char **cpp)
- {
- const char *cp;
- char *ep;
- int sym;
- bool defparen;
- Linetype lt;
- cp = skipcomment(*cpp);
- if (*cp == '!') {
- debug("eval%d !", prec(ops));
- cp++;
- lt = eval_unary(ops, valp, &cp);
- if (lt == LT_ERROR)
- return (LT_ERROR);
- if (lt != LT_IF) {
- *valp = !*valp;
- lt = *valp ? LT_TRUE : LT_FALSE;
- }
- } else if (*cp == '(') {
- cp++;
- debug("eval%d (", prec(ops));
- lt = eval_table(eval_ops, valp, &cp);
- if (lt == LT_ERROR)
- return (LT_ERROR);
- cp = skipcomment(cp);
- if (*cp++ != ')')
- return (LT_ERROR);
- } else if (isdigit((unsigned char)*cp)) {
- debug("eval%d number", prec(ops));
- *valp = strtol(cp, &ep, 0);
- if (ep == cp)
- return (LT_ERROR);
- lt = *valp ? LT_TRUE : LT_FALSE;
- cp = ep;
- } else if (matchsym("defined", cp) != NULL) {
- cp = skipcomment(cp+7);
- if (*cp == '(') {
- cp = skipcomment(cp+1);
- defparen = true;
- } else {
- defparen = false;
- }
- sym = findsym(&cp);
- cp = skipcomment(cp);
- if (defparen && *cp++ != ')') {
- debug("eval%d defined missing ')'", prec(ops));
- return (LT_ERROR);
- }
- if (sym < 0) {
- debug("eval%d defined unknown", prec(ops));
- lt = LT_IF;
- } else {
- debug("eval%d defined %s", prec(ops), symname[sym]);
- *valp = (value[sym] != NULL);
- lt = *valp ? LT_TRUE : LT_FALSE;
- }
- constexpr = false;
- } else if (!endsym(*cp)) {
- debug("eval%d symbol", prec(ops));
- sym = findsym(&cp);
- if (sym < 0) {
- lt = LT_IF;
- cp = skipargs(cp);
- } else if (value[sym] == NULL) {
- *valp = 0;
- lt = LT_FALSE;
- } else {
- *valp = strtol(value[sym], &ep, 0);
- if (*ep != '\0' || ep == value[sym])
- return (LT_ERROR);
- lt = *valp ? LT_TRUE : LT_FALSE;
- cp = skipargs(cp);
- }
- constexpr = false;
- } else {
- debug("eval%d bad expr", prec(ops));
- return (LT_ERROR);
- }
- *cpp = cp;
- debug("eval%d = %d", prec(ops), *valp);
- return (lt);
- }
- /*
- * Table-driven evaluation of binary operators.
- */
- static Linetype
- eval_table(const struct ops *ops, long *valp, const char **cpp)
- {
- const struct op *op;
- const char *cp;
- long val;
- Linetype lt, rt;
- debug("eval%d", prec(ops));
- cp = *cpp;
- lt = ops->inner(ops+1, valp, &cp);
- if (lt == LT_ERROR)
- return (LT_ERROR);
- for (;;) {
- cp = skipcomment(cp);
- for (op = ops->op; op->str != NULL; op++)
- if (strncmp(cp, op->str, strlen(op->str)) == 0)
- break;
- if (op->str == NULL)
- break;
- cp += strlen(op->str);
- debug("eval%d %s", prec(ops), op->str);
- rt = ops->inner(ops+1, &val, &cp);
- if (rt == LT_ERROR)
- return (LT_ERROR);
- lt = op->fn(valp, lt, *valp, rt, val);
- }
- *cpp = cp;
- debug("eval%d = %d", prec(ops), *valp);
- debug("eval%d lt = %s", prec(ops), linetype_name[lt]);
- return (lt);
- }
- /*
- * Evaluate the expression on a #if or #elif line. If we can work out
- * the result we return LT_TRUE or LT_FALSE accordingly, otherwise we
- * return just a generic LT_IF.
- */
- static Linetype
- ifeval(const char **cpp)
- {
- Linetype ret;
- long val = 0;
- debug("eval %s", *cpp);
- constexpr = killconsts ? false : true;
- ret = eval_table(eval_ops, &val, cpp);
- debug("eval = %d", val);
- return (constexpr ? LT_IF : ret == LT_ERROR ? LT_IF : ret);
- }
- /*
- * Read a line and examine its initial part to determine if it is a
- * preprocessor directive. Returns NULL on EOF, or a pointer to a
- * preprocessor directive name, or a pointer to the zero byte at the
- * end of the line.
- */
- static const char *
- skiphash(void)
- {
- const char *cp;
- linenum++;
- if (fgets(tline, MAXLINE, input) == NULL) {
- if (ferror(input))
- err(2, "can't read %s", filename);
- else
- return (NULL);
- }
- cp = skipcomment(tline);
- if (linestate == LS_START && *cp == '#') {
- linestate = LS_HASH;
- return (skipcomment(cp + 1));
- } else if (*cp == '\0') {
- return (cp);
- } else {
- return (skipline(cp));
- }
- }
- /*
- * Mark a line dirty and consume the rest of it, keeping track of the
- * lexical state.
- */
- static const char *
- skipline(const char *cp)
- {
- if (*cp != '\0')
- linestate = LS_DIRTY;
- while (*cp != '\0')
- cp = skipcomment(cp + 1);
- return (cp);
- }
- /*
- * Skip over comments, strings, and character literals and stop at the
- * next character position that is not whitespace. Between calls we keep
- * the comment state in the global variable incomment, and we also adjust
- * the global variable linestate when we see a newline.
- * XXX: doesn't cope with the buffer splitting inside a state transition.
- */
- static const char *
- skipcomment(const char *cp)
- {
- if (text || ignoring[depth]) {
- for (; isspace((unsigned char)*cp); cp++)
- if (*cp == '\n')
- linestate = LS_START;
- return (cp);
- }
- while (*cp != '\0')
- /* don't reset to LS_START after a line continuation */
- if (strncmp(cp, "\\\r\n", 3) == 0)
- cp += 3;
- else if (strncmp(cp, "\\\n", 2) == 0)
- cp += 2;
- else switch (incomment) {
- case NO_COMMENT:
- if (strncmp(cp, "/\\\r\n", 4) == 0) {
- incomment = STARTING_COMMENT;
- cp += 4;
- } else if (strncmp(cp, "/\\\n", 3) == 0) {
- incomment = STARTING_COMMENT;
- cp += 3;
- } else if (strncmp(cp, "/*", 2) == 0) {
- incomment = C_COMMENT;
- cp += 2;
- } else if (strncmp(cp, "//", 2) == 0) {
- incomment = CXX_COMMENT;
- cp += 2;
- } else if (strncmp(cp, "\'", 1) == 0) {
- incomment = CHAR_LITERAL;
- linestate = LS_DIRTY;
- cp += 1;
- } else if (strncmp(cp, "\"", 1) == 0) {
- incomment = STRING_LITERAL;
- linestate = LS_DIRTY;
- cp += 1;
- } else if (strncmp(cp, "\n", 1) == 0) {
- linestate = LS_START;
- cp += 1;
- } else if (strchr(" \r\t", *cp) != NULL) {
- cp += 1;
- } else
- return (cp);
- continue;
- case CXX_COMMENT:
- if (strncmp(cp, "\n", 1) == 0) {
- incomment = NO_COMMENT;
- linestate = LS_START;
- }
- cp += 1;
- continue;
- case CHAR_LITERAL:
- case STRING_LITERAL:
- if ((incomment == CHAR_LITERAL && cp[0] == '\'') ||
- (incomment == STRING_LITERAL && cp[0] == '\"')) {
- incomment = NO_COMMENT;
- cp += 1;
- } else if (cp[0] == '\\') {
- if (cp[1] == '\0')
- cp += 1;
- else
- cp += 2;
- } else if (strncmp(cp, "\n", 1) == 0) {
- if (incomment == CHAR_LITERAL)
- error("unterminated char literal");
- else
- error("unterminated string literal");
- } else
- cp += 1;
- continue;
- case C_COMMENT:
- if (strncmp(cp, "*\\\r\n", 4) == 0) {
- incomment = FINISHING_COMMENT;
- cp += 4;
- } else if (strncmp(cp, "*\\\n", 3) == 0) {
- incomment = FINISHING_COMMENT;
- cp += 3;
- } else if (strncmp(cp, "*/", 2) == 0) {
- incomment = NO_COMMENT;
- cp += 2;
- } else
- cp += 1;
- continue;
- case STARTING_COMMENT:
- if (*cp == '*') {
- incomment = C_COMMENT;
- cp += 1;
- } else if (*cp == '/') {
- incomment = CXX_COMMENT;
- cp += 1;
- } else {
- incomment = NO_COMMENT;
- linestate = LS_DIRTY;
- }
- continue;
- case FINISHING_COMMENT:
- if (*cp == '/') {
- incomment = NO_COMMENT;
- cp += 1;
- } else
- incomment = C_COMMENT;
- continue;
- default:
- abort(); /* bug */
- }
- return (cp);
- }
- /*
- * Skip macro arguments.
- */
- static const char *
- skipargs(const char *cp)
- {
- const char *ocp = cp;
- int level = 0;
- cp = skipcomment(cp);
- if (*cp != '(')
- return (cp);
- do {
- if (*cp == '(')
- level++;
- if (*cp == ')')
- level--;
- cp = skipcomment(cp+1);
- } while (level != 0 && *cp != '\0');
- if (level == 0)
- return (cp);
- else
- /* Rewind and re-detect the syntax error later. */
- return (ocp);
- }
- /*
- * Skip over an identifier.
- */
- static const char *
- skipsym(const char *cp)
- {
- while (!endsym(*cp))
- ++cp;
- return (cp);
- }
- /*
- * Skip whitespace and take a copy of any following identifier.
- */
- static const char *
- getsym(const char **cpp)
- {
- const char *cp = *cpp, *sym;
- cp = skipcomment(cp);
- cp = skipsym(sym = cp);
- if (cp == sym)
- return NULL;
- *cpp = cp;
- return (xstrdup(sym, cp));
- }
- /*
- * Check that s (a symbol) matches the start of t, and that the
- * following character in t is not a symbol character. Returns a
- * pointer to the following character in t if there is a match,
- * otherwise NULL.
- */
- static const char *
- matchsym(const char *s, const char *t)
- {
- while (*s != '\0' && *t != '\0')
- if (*s != *t)
- return (NULL);
- else
- ++s, ++t;
- if (*s == '\0' && endsym(*t))
- return(t);
- else
- return(NULL);
- }
- /*
- * Look for the symbol in the symbol table. If it is found, we return
- * the symbol table index, else we return -1.
- */
- static int
- findsym(const char **strp)
- {
- const char *str;
- int symind;
- str = *strp;
- *strp = skipsym(str);
- if (symlist) {
- if (*strp == str)
- return (-1);
- if (symdepth && firstsym)
- printf("%s%3d", zerosyms ? "" : "\n", depth);
- firstsym = zerosyms = false;
- printf("%s%.*s%s",
- symdepth ? " " : "",
- (int)(*strp-str), str,
- symdepth ? "" : "\n");
- /* we don't care about the value of the symbol */
- return (0);
- }
- for (symind = 0; symind < nsyms; ++symind) {
- if (matchsym(symname[symind], str) != NULL) {
- debugsym("findsym", symind);
- return (symind);
- }
- }
- return (-1);
- }
- /*
- * Resolve indirect symbol values to their final definitions.
- */
- static void
- indirectsym(void)
- {
- const char *cp;
- int changed, sym, ind;
- do {
- changed = 0;
- for (sym = 0; sym < nsyms; ++sym) {
- if (value[sym] == NULL)
- continue;
- cp = value[sym];
- ind = findsym(&cp);
- if (ind == -1 || ind == sym ||
- *cp != '\0' ||
- value[ind] == NULL ||
- value[ind] == value[sym])
- continue;
- debugsym("indir...", sym);
- value[sym] = value[ind];
- debugsym("...ectsym", sym);
- changed++;
- }
- } while (changed);
- }
- /*
- * Add a symbol to the symbol table, specified with the format sym=val
- */
- static void
- addsym1(bool ignorethis, bool definethis, char *symval)
- {
- const char *sym, *val;
- sym = symval;
- val = skipsym(sym);
- if (definethis && *val == '=') {
- symval[val - sym] = '\0';
- val = val + 1;
- } else if (*val == '\0') {
- val = definethis ? "1" : NULL;
- } else {
- usage();
- }
- addsym2(ignorethis, sym, val);
- }
- /*
- * Add a symbol to the symbol table.
- */
- static void
- addsym2(bool ignorethis, const char *sym, const char *val)
- {
- const char *cp = sym;
- int symind;
- symind = findsym(&cp);
- if (symind < 0) {
- if (nsyms >= MAXSYMS)
- errx(2, "too many symbols");
- symind = nsyms++;
- }
- ignore[symind] = ignorethis;
- symname[symind] = sym;
- value[symind] = val;
- debugsym("addsym", symind);
- }
- static void
- debugsym(const char *why, int symind)
- {
- debug("%s %s%c%s", why, symname[symind],
- value[symind] ? '=' : ' ',
- value[symind] ? value[symind] : "undef");
- }
- /*
- * Add symbols to the symbol table from a file containing
- * #define and #undef preprocessor directives.
- */
- static void
- defundefile(const char *fn)
- {
- filename = fn;
- input = fopen(fn, "rb");
- if (input == NULL)
- err(2, "can't open %s", fn);
- linenum = 0;
- while (defundef())
- ;
- if (ferror(input))
- err(2, "can't read %s", filename);
- else
- fclose(input);
- if (incomment)
- error("EOF in comment");
- }
- /*
- * Read and process one #define or #undef directive
- */
- static bool
- defundef(void)
- {
- const char *cp, *kw, *sym, *val, *end;
- cp = skiphash();
- if (cp == NULL)
- return (false);
- if (*cp == '\0')
- goto done;
- /* strip trailing whitespace, and do a fairly rough check to
- avoid unsupported multi-line preprocessor directives */
- end = cp + strlen(cp);
- while (end > tline && strchr(" \t\n\r", end[-1]) != NULL)
- --end;
- if (end > tline && end[-1] == '\\')
- Eioccc();
- kw = cp;
- if ((cp = matchsym("define", kw)) != NULL) {
- sym = getsym(&cp);
- if (sym == NULL)
- error("missing macro name in #define");
- if (*cp == '(') {
- val = "1";
- } else {
- cp = skipcomment(cp);
- val = (cp < end) ? xstrdup(cp, end) : "";
- }
- debug("#define");
- addsym2(false, sym, val);
- } else if ((cp = matchsym("undef", kw)) != NULL) {
- sym = getsym(&cp);
- if (sym == NULL)
- error("missing macro name in #undef");
- cp = skipcomment(cp);
- debug("#undef");
- addsym2(false, sym, NULL);
- } else {
- error("unrecognized preprocessor directive");
- }
- skipline(cp);
- done:
- debug("parser line %d state %s comment %s line", linenum,
- comment_name[incomment], linestate_name[linestate]);
- return (true);
- }
- /*
- * Concatenate two strings into new memory, checking for failure.
- */
- static char *
- astrcat(const char *s1, const char *s2)
- {
- char *s;
- int len;
- size_t size;
- len = snprintf(NULL, 0, "%s%s", s1, s2);
- if (len < 0)
- err(2, "snprintf");
- size = (size_t)len + 1;
- s = (char *)malloc(size);
- if (s == NULL)
- err(2, "malloc");
- snprintf(s, size, "%s%s", s1, s2);
- return (s);
- }
- /*
- * Duplicate a segment of a string, checking for failure.
- */
- static const char *
- xstrdup(const char *start, const char *end)
- {
- size_t n;
- char *s;
- if (end < start) abort(); /* bug */
- n = (size_t)(end - start) + 1;
- s = malloc(n);
- if (s == NULL)
- err(2, "malloc");
- snprintf(s, n, "%s", start);
- return (s);
- }
- /*
- * Diagnostics.
- */
- static void
- debug(const char *msg, ...)
- {
- va_list ap;
- if (debugging) {
- va_start(ap, msg);
- vwarnx(msg, ap);
- va_end(ap);
- }
- }
- static void
- error(const char *msg)
- {
- if (depth == 0)
- warnx("%s: %d: %s", filename, linenum, msg);
- else
- warnx("%s: %d: %s (#if line %d depth %d)",
- filename, linenum, msg, stifline[depth], depth);
- closeio();
- errx(2, "output may be truncated");
- }
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