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scripts/unifdef.c
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/* |
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* Copyright (c) 2002 - 2011 Tony Finch <dot@dotat.at> |
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* * 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. */ |
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/* |
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* unifdef - remove ifdef'ed lines * |
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* 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. * |
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* 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 * |
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* These require better buffer handling, which would also make * it possible to handle all "dodgy" directives correctly. |
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*/ |
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#include <sys/types.h> #include <sys/stat.h> |
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#include <ctype.h> #include <err.h> |
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#include <errno.h> |
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#include <stdarg.h> #include <stdbool.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> |
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const char copyright[] = "@(#) $Version: unifdef-2.5 $ " "@(#) $Author: Tony Finch (dot@dotat.at) $ " "@(#) $URL: http://dotat.at/prog/unifdef $ " ; |
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/* 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 */ |
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LT_ERROR, /* unevaluable #if */ |
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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", |
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"PLAIN", "EOF", "ERROR" |
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}; /* 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 4096 /* 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 /* |
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* For temporary filenames */ #define TEMPLATE "unifdef.XXXXXX" /* |
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* Globals. */ |
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static bool compblank; /* -B: compress blank lines */ static bool lnblank; /* -b: blank deleted lines */ |
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static bool complement; /* -c: do the complement */ static bool debugging; /* -d: debugging reports */ static bool iocccok; /* -e: fewer IOCCC errors */ |
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static bool strictlogic; /* -K: keep ambiguous #ifs */ |
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static bool killconsts; /* -k: eval constant #ifs */ |
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static bool lnnum; /* -n: add #line directives */ static bool symlist; /* -s: output symbol list */ |
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static bool symdepth; /* -S: output symbol depth */ |
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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 */ |
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static FILE *output; /* output file pointer */ static const char *ofilename; /* output file name */ static bool overwriting; /* output overwrites input */ static char tempname[FILENAME_MAX]; /* used when overwriting */ |
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static char tline[MAXLINE+EDITSLOP];/* input buffer plus space */ static char *keyword; /* used for editing #elif's */ |
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static const char *newline; /* input file format */ static const char newline_unix[] = " "; static const char newline_crlf[] = "\r "; |
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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 */ |
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static unsigned blankcount; /* count of blank lines */ static unsigned blankmax; /* maximum recent blankcount */ static bool constexpr; /* constant #if expression */ |
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static bool zerosyms = true; /* to format symdepth output */ static bool firstsym; /* ditto */ |
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static int exitstat; /* program exit status */ static void addsym(bool, bool, char *); |
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static void closeout(void); |
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static void debug(const char *, ...); static void done(void); static void error(const char *); static int findsym(const char *); static void flushline(bool); |
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static Linetype parseline(void); |
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static Linetype ifeval(const char **); static void ignoreoff(void); static void ignoreon(void); static void keywordedit(const char *); static void nest(void); static void process(void); |
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static const char *skipargs(const char *); |
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static const char *skipcomment(const char *); static const char *skipsym(const char *); static void state(Ifstate); static int strlcmp(const char *, const char *, size_t); static void unnest(void); static void usage(void); |
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static void version(void); |
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#define endsym(c) (!isalnum((unsigned char)c) && c != '_') |
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/* * The main program. */ int main(int argc, char *argv[]) { int opt; |
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while ((opt = getopt(argc, argv, "i:D:U:I:o:bBcdeKklnsStV")) != -1) |
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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') addsym(true, true, optarg); else if (opt == 'U') addsym(true, false, optarg); else usage(); break; case 'D': /* define a symbol */ addsym(false, true, optarg); break; case 'U': /* undef a symbol */ addsym(false, false, optarg); break; |
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case 'I': /* no-op for compatibility with cpp */ |
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break; case 'b': /* blank deleted lines instead of omitting them */ case 'l': /* backwards compatibility */ lnblank = true; break; |
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case 'B': /* compress blank lines around removed section */ compblank = true; break; |
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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; |
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case 'K': /* keep ambiguous #ifs */ strictlogic = true; break; |
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case 'k': /* process constant #ifs */ killconsts = true; break; |
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case 'n': /* add #line directive after deleted lines */ lnnum = true; break; |
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case 'o': /* output to a file */ ofilename = optarg; break; |
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case 's': /* only output list of symbols that control #ifs */ symlist = true; break; |
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case 'S': /* list symbols with their nesting depth */ symlist = symdepth = true; break; |
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case 't': /* don't parse C comments */ text = true; break; |
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case 'V': /* print version */ version(); |
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default: usage(); } argc -= optind; argv += optind; |
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if (compblank && lnblank) errx(2, "-B and -b are mutually exclusive"); |
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if (argc > 1) { errx(2, "can only do one file"); } else if (argc == 1 && strcmp(*argv, "-") != 0) { filename = *argv; |
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input = fopen(filename, "rb"); |
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if (input == NULL) err(2, "can't open %s", filename); } else { filename = "[stdin]"; input = stdin; } |
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if (ofilename == NULL) { ofilename = "[stdout]"; output = stdout; } else { struct stat ist, ost; if (stat(ofilename, &ost) == 0 && fstat(fileno(input), &ist) == 0) overwriting = (ist.st_dev == ost.st_dev && ist.st_ino == ost.st_ino); if (overwriting) { const char *dirsep; int ofd; dirsep = strrchr(ofilename, '/'); if (dirsep != NULL) snprintf(tempname, sizeof(tempname), "%.*s/" TEMPLATE, (int)(dirsep - ofilename), ofilename); else snprintf(tempname, sizeof(tempname), TEMPLATE); ofd = mkstemp(tempname); if (ofd != -1) output = fdopen(ofd, "wb+"); if (output == NULL) err(2, "can't create temporary file"); fchmod(ofd, ist.st_mode & (S_IRWXU|S_IRWXG|S_IRWXO)); } else { output = fopen(ofilename, "wb"); if (output == NULL) err(2, "can't open %s", ofilename); } } |
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process(); abort(); /* bug */ } static void |
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version(void) { const char *c = copyright; for (;;) { while (*++c != '$') if (*c == '\0') exit(0); while (*++c != '$') putc(*c, stderr); putc(' ', stderr); } } static void |
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usage(void) { |
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fprintf(stderr, "usage: unifdef [-bBcdeKknsStV] [-Ipath]" |
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" [-Dsym[=val]] [-Usym] [-iDsym[=val]] [-iUsym] ... [file] "); exit(2); } /* * 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 |
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* latter into a #if to keep the nesting correct. We use strncpy() to * overwrite the 4 byte token "elif" with "if " without a '\0' byte. |
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* * 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(); } |
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/* modify this line */ |
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static void Mpass (void) { strncpy(keyword, "if ", 4); Pelif(); } |
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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); } |
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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, |
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print, done, abort }, |
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/* IS_FALSE_PREFIX */ { Idrop, Idrop, Fdrop, Fdrop, Fdrop, Mpass, Strue, Sfalse,Selse, Dendif, Idrop, Idrop, Fdrop, Fdrop, Fdrop, Mpass, Eioccc,Eioccc,Eioccc,Eioccc, |
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drop, Eeof, abort }, |
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/* IS_TRUE_PREFIX */ { Itrue, Ifalse,Fpass, Ftrue, Ffalse,Dfalse,Dfalse,Dfalse,Delse, Dendif, Oiffy, Oiffy, Fpass, Oif, Oif, Eioccc,Eioccc,Eioccc,Eioccc,Eioccc, |
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print, Eeof, abort }, |
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/* IS_PASS_MIDDLE */ { Itrue, Ifalse,Fpass, Ftrue, Ffalse,Pelif, Mtrue, Delif, Pelse, Pendif, Oiffy, Oiffy, Fpass, Oif, Oif, Pelif, Oelif, Oelif, Pelse, Pendif, |
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print, Eeof, abort }, |
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/* IS_FALSE_MIDDLE */ { Idrop, Idrop, Fdrop, Fdrop, Fdrop, Pelif, Mtrue, Delif, Pelse, Pendif, Idrop, Idrop, Fdrop, Fdrop, Fdrop, Eioccc,Eioccc,Eioccc,Eioccc,Eioccc, |
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drop, Eeof, abort }, |
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/* IS_TRUE_MIDDLE */ { Itrue, Ifalse,Fpass, Ftrue, Ffalse,Melif, Melif, Melif, Melse, Pendif, Oiffy, Oiffy, Fpass, Oif, Oif, Eioccc,Eioccc,Eioccc,Eioccc,Pendif, |
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print, Eeof, abort }, |
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/* IS_PASS_ELSE */ { Itrue, Ifalse,Fpass, Ftrue, Ffalse,Eelif, Eelif, Eelif, Eelse, Pendif, Oiffy, Oiffy, Fpass, Oif, Oif, Eelif, Eelif, Eelif, Eelse, Pendif, |
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print, Eeof, abort }, |
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/* IS_FALSE_ELSE */ { Idrop, Idrop, Fdrop, Fdrop, Fdrop, Eelif, Eelif, Eelif, Eelse, Dendif, Idrop, Idrop, Fdrop, Fdrop, Fdrop, Eelif, Eelif, Eelif, Eelse, Eioccc, |
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drop, Eeof, abort }, |
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/* IS_TRUE_ELSE */ { Itrue, Ifalse,Fpass, Ftrue, Ffalse,Eelif, Eelif, Eelif, Eelse, Dendif, Oiffy, Oiffy, Fpass, Oif, Oif, Eelif, Eelif, Eelif, Eelse, Eioccc, |
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print, Eeof, abort }, |
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/* IS_FALSE_TRAILER */ { Idrop, Idrop, Fdrop, Fdrop, Fdrop, Dfalse,Dfalse,Dfalse,Delse, Dendif, Idrop, Idrop, Fdrop, Fdrop, Fdrop, Dfalse,Dfalse,Dfalse,Delse, Eioccc, |
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drop, Eeof, abort } |
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/*TRUEI FALSEI IF TRUE FALSE ELIF ELTRUE ELFALSE ELSE ENDIF TRUEI FALSEI IF TRUE FALSE ELIF ELTRUE ELFALSE ELSE ENDIF (DODGY) |
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PLAIN EOF ERROR */ |
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}; /* * State machine utility functions */ static void |
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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) { |
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snprintf(keyword, tline + sizeof(tline) - keyword, "%s%s", replacement, newline); |
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print(); } static void nest(void) { |
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if (depth > MAXDEPTH-1) abort(); /* bug */ if (depth == MAXDEPTH-1) |
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error("Too many levels of nesting"); |
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depth += 1; |
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stifline[depth] = linenum; } static void unnest(void) { if (depth == 0) abort(); /* bug */ depth -= 1; } static void state(Ifstate is) { ifstate[depth] = is; } /* * Write a line to the output or not, according to command line options. */ static void flushline(bool keep) { if (symlist) return; if (keep ^ complement) { |
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bool blankline = tline[strspn(tline, " \t\r ")] == '\0'; |
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if (blankline && compblank && blankcount != blankmax) { delcount += 1; blankcount += 1; } else { if (lnnum && delcount > 0) |
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printf("#line %d%s", linenum, newline); fputs(tline, output); |
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delcount = 0; blankmax = blankcount = blankline ? blankcount + 1 : 0; } |
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} else { if (lnblank) |
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fputs(newline, output); |
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exitstat = 1; delcount += 1; |
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blankcount = 0; |
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} |
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if (debugging) fflush(output); |
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} /* * The driver for the state machine. */ static void process(void) { |
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/* When compressing blank lines, act as if the file is preceded by a large number of blank lines. */ blankmax = blankcount = 1000; |
01f1c8799
|
588 |
for (;;) { |
3cbea4366
|
589 |
Linetype lineval = parseline(); |
01f1c8799
|
590 |
trans_table[ifstate[depth]][lineval](); |
3cbea4366
|
591 592 |
debug("process line %d %s -> %s depth %d", linenum, linetype_name[lineval], |
01f1c8799
|
593 594 595 596 597 |
ifstate_name[ifstate[depth]], depth); } } /* |
3cbea4366
|
598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 |
* Flush the output and handle errors. */ static void closeout(void) { if (symdepth && !zerosyms) printf(" "); if (fclose(output) == EOF) { warn("couldn't write to %s", ofilename); if (overwriting) { unlink(tempname); errx(2, "%s unchanged", filename); } else { exit(2); } } } /* * Clean up and exit. */ static void done(void) { if (incomment) error("EOF in comment"); closeout(); if (overwriting && rename(tempname, ofilename) == -1) { warn("couldn't rename temporary file"); unlink(tempname); errx(2, "%s unchanged", ofilename); } exit(exitstat); } /* |
01f1c8799
|
635 636 637 638 639 |
* 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 |
d8379ab1d
|
640 |
parseline(void) |
01f1c8799
|
641 642 643 644 645 646 |
{ const char *cp; int cursym; int kwlen; Linetype retval; Comment_state wascomment; |
3cbea4366
|
647 |
linenum++; |
01f1c8799
|
648 649 |
if (fgets(tline, MAXLINE, input) == NULL) return (LT_EOF); |
3cbea4366
|
650 651 652 653 654 655 656 |
if (newline == NULL) { if (strrchr(tline, ' ') == strrchr(tline, '\r') + 1) newline = newline_crlf; else newline = newline_unix; } |
01f1c8799
|
657 658 659 660 661 662 |
retval = LT_PLAIN; wascomment = incomment; cp = skipcomment(tline); if (linestate == LS_START) { if (*cp == '#') { linestate = LS_HASH; |
3cbea4366
|
663 |
firstsym = true; |
01f1c8799
|
664 665 666 667 668 669 670 671 672 |
cp = skipcomment(cp + 1); } else if (*cp != '\0') linestate = LS_DIRTY; } if (!incomment && linestate == LS_HASH) { keyword = tline + (cp - tline); cp = skipsym(cp); kwlen = cp - keyword; /* no way can we deal with a continuation inside a keyword */ |
3cbea4366
|
673 674 675 676 |
if (strncmp(cp, "\\\r ", 3) == 0 || strncmp(cp, "\\ ", 2) == 0) |
01f1c8799
|
677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 |
Eioccc(); if (strlcmp("ifdef", keyword, kwlen) == 0 || strlcmp("ifndef", keyword, kwlen) == 0) { 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; } cp = skipsym(cp); } else if (strlcmp("if", keyword, kwlen) == 0) retval = ifeval(&cp); else if (strlcmp("elif", keyword, kwlen) == 0) retval = ifeval(&cp) - LT_IF + LT_ELIF; else if (strlcmp("else", keyword, kwlen) == 0) retval = LT_ELSE; else if (strlcmp("endif", keyword, kwlen) == 0) retval = LT_ENDIF; else { linestate = LS_DIRTY; retval = LT_PLAIN; } cp = skipcomment(cp); if (*cp != '\0') { linestate = LS_DIRTY; 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; } if (retval != LT_PLAIN && (wascomment || incomment)) { retval += LT_DODGY; if (incomment) linestate = LS_DIRTY; } |
d8379ab1d
|
720 721 722 723 724 725 726 |
/* skipcomment normally changes the state, except if the last line of the file lacks a newline, or if there is too much whitespace in a directive */ if (linestate == LS_HASH) { size_t len = cp - tline; if (fgets(tline + len, MAXLINE - len, input) == NULL) { /* append the missing newline */ |
3cbea4366
|
727 728 |
strcpy(tline + len, newline); cp += strlen(newline); |
d8379ab1d
|
729 730 731 732 733 |
linestate = LS_START; } else { linestate = LS_DIRTY; } } |
01f1c8799
|
734 735 736 737 738 |
} if (linestate == LS_DIRTY) { while (*cp != '\0') cp = skipcomment(cp + 1); } |
3cbea4366
|
739 |
debug("parser line %d state %s comment %s line", linenum, |
01f1c8799
|
740 741 742 743 744 745 |
comment_name[incomment], linestate_name[linestate]); return (retval); } /* * These are the binary operators that are supported by the expression |
d8379ab1d
|
746 |
* evaluator. |
01f1c8799
|
747 |
*/ |
d8379ab1d
|
748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 |
static Linetype op_strict(int *p, int 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(int *p, Linetype at, int a, Linetype bt, int b) { return op_strict(p, a < b, at, bt); } static Linetype op_gt(int *p, Linetype at, int a, Linetype bt, int b) { return op_strict(p, a > b, at, bt); } static Linetype op_le(int *p, Linetype at, int a, Linetype bt, int b) { return op_strict(p, a <= b, at, bt); } static Linetype op_ge(int *p, Linetype at, int a, Linetype bt, int b) { return op_strict(p, a >= b, at, bt); } static Linetype op_eq(int *p, Linetype at, int a, Linetype bt, int b) { return op_strict(p, a == b, at, bt); } static Linetype op_ne(int *p, Linetype at, int a, Linetype bt, int b) { return op_strict(p, a != b, at, bt); } static Linetype op_or(int *p, Linetype at, int a, Linetype bt, int 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(int *p, Linetype at, int a, Linetype bt, int b) { if (!strictlogic && (at == LT_FALSE || bt == LT_FALSE)) return (*p = 0, LT_FALSE); return op_strict(p, a && b, at, bt); } |
01f1c8799
|
780 781 782 783 784 785 786 787 |
/* * 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 |
d8379ab1d
|
788 789 |
* 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. |
01f1c8799
|
790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 |
*/ struct ops; typedef Linetype eval_fn(const struct ops *, int *, 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. */ static const struct ops { eval_fn *inner; struct op { const char *str; |
d8379ab1d
|
808 |
Linetype (*fn)(int *, Linetype, int, Linetype, int); |
01f1c8799
|
809 810 811 812 813 814 815 816 817 818 819 820 821 822 |
} op[5]; } 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 } } } }; /* * Function for evaluating the innermost parts of expressions, |
d8379ab1d
|
823 824 |
* viz. !expr (expr) number defined(symbol) symbol * We reset the constexpr flag in the last two cases. |
01f1c8799
|
825 826 827 828 829 830 831 |
*/ static Linetype eval_unary(const struct ops *ops, int *valp, const char **cpp) { const char *cp; char *ep; int sym; |
d8379ab1d
|
832 833 |
bool defparen; Linetype lt; |
01f1c8799
|
834 835 836 837 838 |
cp = skipcomment(*cpp); if (*cp == '!') { debug("eval%d !", ops - eval_ops); cp++; |
d8379ab1d
|
839 840 841 842 843 844 |
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; |
eedc9d83e
|
845 |
} |
01f1c8799
|
846 847 848 |
} else if (*cp == '(') { cp++; debug("eval%d (", ops - eval_ops); |
d8379ab1d
|
849 850 851 |
lt = eval_table(eval_ops, valp, &cp); if (lt == LT_ERROR) return (LT_ERROR); |
01f1c8799
|
852 853 |
cp = skipcomment(cp); if (*cp++ != ')') |
d8379ab1d
|
854 |
return (LT_ERROR); |
01f1c8799
|
855 856 857 |
} else if (isdigit((unsigned char)*cp)) { debug("eval%d number", ops - eval_ops); *valp = strtol(cp, &ep, 0); |
d8379ab1d
|
858 859 860 |
if (ep == cp) return (LT_ERROR); lt = *valp ? LT_TRUE : LT_FALSE; |
01f1c8799
|
861 862 863 864 |
cp = skipsym(cp); } else if (strncmp(cp, "defined", 7) == 0 && endsym(cp[7])) { cp = skipcomment(cp+7); debug("eval%d defined", ops - eval_ops); |
d8379ab1d
|
865 866 867 868 869 870 |
if (*cp == '(') { cp = skipcomment(cp+1); defparen = true; } else { defparen = false; } |
01f1c8799
|
871 |
sym = findsym(cp); |
d8379ab1d
|
872 873 874 |
if (sym < 0) { lt = LT_IF; } else { |
eedc9d83e
|
875 |
*valp = (value[sym] != NULL); |
d8379ab1d
|
876 |
lt = *valp ? LT_TRUE : LT_FALSE; |
eedc9d83e
|
877 |
} |
d8379ab1d
|
878 879 880 881 882 |
cp = skipsym(cp); cp = skipcomment(cp); if (defparen && *cp++ != ')') return (LT_ERROR); constexpr = false; |
01f1c8799
|
883 884 885 |
} else if (!endsym(*cp)) { debug("eval%d symbol", ops - eval_ops); sym = findsym(cp); |
d8379ab1d
|
886 887 888 889 890 |
cp = skipsym(cp); if (sym < 0) { lt = LT_IF; cp = skipargs(cp); } else if (value[sym] == NULL) { |
01f1c8799
|
891 |
*valp = 0; |
d8379ab1d
|
892 893 |
lt = LT_FALSE; } else { |
01f1c8799
|
894 895 |
*valp = strtol(value[sym], &ep, 0); if (*ep != '\0' || ep == value[sym]) |
d8379ab1d
|
896 897 898 |
return (LT_ERROR); lt = *valp ? LT_TRUE : LT_FALSE; cp = skipargs(cp); |
01f1c8799
|
899 |
} |
d8379ab1d
|
900 |
constexpr = false; |
01f1c8799
|
901 902 |
} else { debug("eval%d bad expr", ops - eval_ops); |
d8379ab1d
|
903 |
return (LT_ERROR); |
01f1c8799
|
904 905 906 907 |
} *cpp = cp; debug("eval%d = %d", ops - eval_ops, *valp); |
d8379ab1d
|
908 |
return (lt); |
01f1c8799
|
909 910 911 912 913 914 915 916 917 918 919 |
} /* * Table-driven evaluation of binary operators. */ static Linetype eval_table(const struct ops *ops, int *valp, const char **cpp) { const struct op *op; const char *cp; int val; |
d8379ab1d
|
920 |
Linetype lt, rt; |
01f1c8799
|
921 922 923 |
debug("eval%d", ops - eval_ops); cp = *cpp; |
d8379ab1d
|
924 925 926 |
lt = ops->inner(ops+1, valp, &cp); if (lt == LT_ERROR) return (LT_ERROR); |
01f1c8799
|
927 928 929 930 931 932 933 934 935 |
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", ops - eval_ops, op->str); |
d8379ab1d
|
936 937 938 939 |
rt = ops->inner(ops+1, &val, &cp); if (rt == LT_ERROR) return (LT_ERROR); lt = op->fn(valp, lt, *valp, rt, val); |
01f1c8799
|
940 941 942 943 |
} *cpp = cp; debug("eval%d = %d", ops - eval_ops, *valp); |
d8379ab1d
|
944 945 |
debug("eval%d lt = %s", ops - eval_ops, linetype_name[lt]); return (lt); |
01f1c8799
|
946 947 948 949 950 951 952 953 954 955 956 |
} /* * 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) { int ret; |
d8379ab1d
|
957 |
int val = 0; |
01f1c8799
|
958 959 |
debug("eval %s", *cpp); |
d8379ab1d
|
960 961 |
constexpr = killconsts ? false : true; ret = eval_table(eval_ops, &val, cpp); |
01f1c8799
|
962 |
debug("eval = %d", val); |
d8379ab1d
|
963 |
return (constexpr ? LT_IF : ret == LT_ERROR ? LT_IF : ret); |
01f1c8799
|
964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 |
} /* * 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 == ' ') linestate = LS_START; return (cp); } while (*cp != '\0') /* don't reset to LS_START after a line continuation */ |
3cbea4366
|
985 986 987 988 989 |
if (strncmp(cp, "\\\r ", 3) == 0) cp += 3; else if (strncmp(cp, "\\ ", 2) == 0) |
01f1c8799
|
990 991 992 |
cp += 2; else switch (incomment) { case NO_COMMENT: |
3cbea4366
|
993 994 995 996 997 998 |
if (strncmp(cp, "/\\\r ", 4) == 0) { incomment = STARTING_COMMENT; cp += 4; } else if (strncmp(cp, "/\\ ", 3) == 0) { |
01f1c8799
|
999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 |
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, " ", 1) == 0) { linestate = LS_START; cp += 1; |
3cbea4366
|
1019 |
} else if (strchr(" \r\t", *cp) != NULL) { |
01f1c8799
|
1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 |
cp += 1; } else return (cp); continue; case CXX_COMMENT: if (strncmp(cp, " ", 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, " ", 1) == 0) { if (incomment == CHAR_LITERAL) error("unterminated char literal"); else error("unterminated string literal"); } else cp += 1; continue; case C_COMMENT: |
3cbea4366
|
1053 1054 1055 1056 1057 1058 |
if (strncmp(cp, "*\\\r ", 4) == 0) { incomment = FINISHING_COMMENT; cp += 4; } else if (strncmp(cp, "*\\ ", 3) == 0) { |
01f1c8799
|
1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 |
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); } /* |
d8379ab1d
|
1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 |
* 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); } /* |
01f1c8799
|
1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 |
* Skip over an identifier. */ static const char * skipsym(const char *cp) { while (!endsym(*cp)) ++cp; return (cp); } /* |
d8379ab1d
|
1129 |
* Look for the symbol in the symbol table. If it is found, we return |
01f1c8799
|
1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 |
* the symbol table index, else we return -1. */ static int findsym(const char *str) { const char *cp; int symind; cp = skipsym(str); if (cp == str) return (-1); if (symlist) { |
3cbea4366
|
1142 1143 1144 1145 1146 1147 1148 1149 1150 |
if (symdepth && firstsym) printf("%s%3d", zerosyms ? "" : " ", depth); firstsym = zerosyms = false; printf("%s%.*s%s", symdepth ? " " : "", (int)(cp-str), str, symdepth ? "" : " "); |
01f1c8799
|
1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 |
/* we don't care about the value of the symbol */ return (0); } for (symind = 0; symind < nsyms; ++symind) { if (strlcmp(symname[symind], str, cp-str) == 0) { debug("findsym %s %s", symname[symind], value[symind] ? value[symind] : ""); return (symind); } } return (-1); } /* * Add a symbol to the symbol table. */ static void addsym(bool ignorethis, bool definethis, char *sym) { int symind; char *val; symind = findsym(sym); if (symind < 0) { if (nsyms >= MAXSYMS) errx(2, "too many symbols"); symind = nsyms++; } symname[symind] = sym; ignore[symind] = ignorethis; val = sym + (skipsym(sym) - sym); if (definethis) { if (*val == '=') { value[symind] = val+1; *val = '\0'; } else if (*val == '\0') |
3cbea4366
|
1187 |
value[symind] = "1"; |
01f1c8799
|
1188 1189 1190 1191 1192 1193 1194 |
else usage(); } else { if (*val != '\0') usage(); value[symind] = NULL; } |
3cbea4366
|
1195 1196 |
debug("addsym %s=%s", symname[symind], value[symind] ? value[symind] : "undef"); |
01f1c8799
|
1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 |
} /* * Compare s with n characters of t. * The same as strncmp() except that it checks that s[n] == '\0'. */ static int strlcmp(const char *s, const char *t, size_t n) { while (n-- && *t != '\0') if (*s != *t) return ((unsigned char)*s - (unsigned char)*t); else ++s, ++t; return ((unsigned char)*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); |
3cbea4366
|
1237 |
closeout(); |
01f1c8799
|
1238 1239 |
errx(2, "output may be truncated"); } |