diff options
Diffstat (limited to 'packages/unifdef/files/unifdef.c')
| -rw-r--r-- | packages/unifdef/files/unifdef.c | 1005 |
1 files changed, 0 insertions, 1005 deletions
diff --git a/packages/unifdef/files/unifdef.c b/packages/unifdef/files/unifdef.c deleted file mode 100644 index 552025e72a..0000000000 --- a/packages/unifdef/files/unifdef.c +++ /dev/null @@ -1,1005 +0,0 @@ -/* - * Copyright (c) 2002 - 2005 Tony Finch <dot@dotat.at>. All rights reserved. - * - * This code is 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 following copyright notice. None of its code remains - * in this version (though some of the names remain). - * - * Copyright (c) 1985, 1993 - * The Regents of the University of California. All rights reserved. - * - * 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. - */ - -#include <sys/cdefs.h> - -#ifndef lint -#if 0 -static const char copyright[] = -"@(#) Copyright (c) 1985, 1993\n\ - The Regents of the University of California. All rights reserved.\n"; -#endif -#ifdef __IDSTRING -__IDSTRING(Berkeley, "@(#)unifdef.c 8.1 (Berkeley) 6/6/93"); -__IDSTRING(NetBSD, "$NetBSD: unifdef.c,v 1.8 2000/07/03 02:51:36 matt Exp $"); -__IDSTRING(dotat, "$dotat: things/unifdef.c,v 1.171 2005/03/08 12:38:48 fanf2 Exp $"); -#endif -#endif /* not lint */ -#ifdef __FBSDID -__FBSDID("$FreeBSD: /repoman/r/ncvs/src/usr.bin/unifdef/unifdef.c,v 1.20 2005/05/21 09:55:09 ru Exp $"); -#endif - -/* - * unifdef - remove ifdef'ed lines - * - * 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 - * - * The first two items above require better buffer handling, which would - * also make it possible to handle all "dodgy" directives correctly. - */ - -#include <ctype.h> -#include <err.h> -#include <stdarg.h> -#include <stdbool.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <unistd.h> - -size_t strlcpy(char *dst, const char *src, size_t siz); - -/* 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_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" -}; - -/* 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 - -/* - * Globals. - */ - -static bool complement; /* -c: do the complement */ -static bool debugging; /* -d: debugging reports */ -static bool iocccok; /* -e: fewer IOCCC errors */ -static bool killconsts; /* -k: eval constant #ifs */ -static bool lnblank; /* -l: blank deleted lines */ -static bool lnnum; /* -n: add #line directives */ -static bool symlist; /* -s: output symbol list */ -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 char tline[MAXLINE+EDITSLOP];/* input buffer plus space */ -static char *keyword; /* used for editing #elif's */ - -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 bool keepthis; /* don't delete constant #if */ - -static int exitstat; /* program exit status */ - -static void addsym(bool, bool, char *); -static void debug(const char *, ...); -static void done(void); -static void error(const char *); -static int findsym(const char *); -static void flushline(bool); -static Linetype getline(void); -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); -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); - -#define endsym(c) (!isalpha((unsigned char)c) && !isdigit((unsigned char)c) && c != '_') - -/* - * The main program. - */ -int -main(int argc, char *argv[]) -{ - int opt; - - while ((opt = getopt(argc, argv, "i:D:U:I:cdeklnst")) != -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') - 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; - case 'I': - /* no-op for compatibility with cpp */ - 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 'k': /* process constant #ifs */ - killconsts = true; - break; - case 'l': /* blank deleted lines instead of omitting them */ - lnblank = true; - break; - case 'n': /* add #line directive after deleted lines */ - lnnum = true; - break; - case 's': /* only output list of symbols that control #ifs */ - symlist = true; - break; - case 't': /* don't parse C comments */ - text = true; - break; - default: - usage(); - } - argc -= optind; - argv += optind; - if (argc > 1) { - errx(2, "can only do one file"); - } else if (argc == 1 && strcmp(*argv, "-") != 0) { - filename = *argv; - input = fopen(filename, "r"); - if (input == NULL) - err(2, "can't open %s", filename); - } else { - filename = "[stdin]"; - input = stdin; - } - process(); - abort(); /* bug */ -} - -static void -usage(void) -{ - fprintf(stderr, "usage: unifdef [-cdeklnst] [-Ipath]" - " [-Dsym[=val]] [-Usym] [-iDsym[=val]] [-iUsym] ... [file]\n"); - 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 - * latter into a #if to keep the nesting correct. - * - * 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(); } -/* edit this line */ -static void Mpass (void) { strncpy(keyword, "if ", 4); Pelif(); } -static void Mtrue (void) { keywordedit("else\n"); state(IS_TRUE_MIDDLE); } -static void Melif (void) { keywordedit("endif\n"); state(IS_FALSE_TRAILER); } -static void Melse (void) { keywordedit("endif\n"); 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 }, -/* 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 }, -/* 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 }, -/* 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 }, -/* 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 }, -/* 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 }, -/* 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 }, -/* 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 }, -/* 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 }, -/* 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 } -/*TRUEI FALSEI IF TRUE FALSE ELIF ELTRUE ELFALSE ELSE ENDIF - TRUEI FALSEI IF TRUE FALSE ELIF ELTRUE ELFALSE ELSE ENDIF (DODGY) - PLAIN EOF */ -}; - -/* - * State machine utility functions - */ -static void -done(void) -{ - if (incomment) - error("EOF in comment"); - exit(exitstat); -} -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) -{ - size_t size = tline + sizeof(tline) - keyword; - char *dst = keyword; - const char *src = replacement; - if (size != 0) { - while ((--size != 0) && (*src != '\0')) - *dst++ = *src++; - *dst = '\0'; - } - print(); -} -static void -nest(void) -{ - depth += 1; - if (depth >= MAXDEPTH) - error("Too many levels of nesting"); - 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) { - if (lnnum && delcount > 0) - printf("#line %d\n", linenum); - fputs(tline, stdout); - delcount = 0; - } else { - if (lnblank) - putc('\n', stdout); - exitstat = 1; - delcount += 1; - } -} - -/* - * The driver for the state machine. - */ -static void -process(void) -{ - Linetype lineval; - - for (;;) { - linenum++; - lineval = getline(); - trans_table[ifstate[depth]][lineval](); - debug("process %s -> %s depth %d", - linetype_name[lineval], - ifstate_name[ifstate[depth]], depth); - } -} - -/* - * 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 -getline(void) -{ - const char *cp; - int cursym; - int kwlen; - Linetype retval; - Comment_state wascomment; - - if (fgets(tline, MAXLINE, input) == NULL) - return (LT_EOF); - retval = LT_PLAIN; - wascomment = incomment; - cp = skipcomment(tline); - if (linestate == LS_START) { - if (*cp == '#') { - linestate = LS_HASH; - 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 */ - if (strncmp(cp, "\\\n", 2) == 0) - 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; - } - /* skipcomment should have changed the state */ - if (linestate == LS_HASH) - abort(); /* bug */ - } - if (linestate == LS_DIRTY) { - while (*cp != '\0') - cp = skipcomment(cp + 1); - } - debug("parser %s comment %s line", - comment_name[incomment], linestate_name[linestate]); - return (retval); -} - -/* - * These are the binary operators that are supported by the expression - * evaluator. Note that if support for division is added then we also - * need short-circuiting booleans because of divide-by-zero. - */ -static int op_lt(int a, int b) { return (a < b); } -static int op_gt(int a, int b) { return (a > b); } -static int op_le(int a, int b) { return (a <= b); } -static int op_ge(int a, int b) { return (a >= b); } -static int op_eq(int a, int b) { return (a == b); } -static int op_ne(int a, int b) { return (a != b); } -static int op_or(int a, int b) { return (a || b); } -static int op_and(int a, int b) { return (a && b); } - -/* - * 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, or LT_IF if the - * expression could not be evaluated. - */ -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; - int (*fn)(int, int); - } 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, - * viz. !expr (expr) defined(symbol) symbol number - * We reset the keepthis flag when we find a non-constant subexpression. - */ -static Linetype -eval_unary(const struct ops *ops, int *valp, const char **cpp) -{ - const char *cp; - char *ep; - int sym; - - cp = skipcomment(*cpp); - if (*cp == '!') { - debug("eval%d !", ops - eval_ops); - cp++; - if (eval_unary(ops, valp, &cp) == LT_IF) - return (LT_IF); - *valp = !*valp; - } else if (*cp == '(') { - cp++; - debug("eval%d (", ops - eval_ops); - if (eval_table(eval_ops, valp, &cp) == LT_IF) - return (LT_IF); - cp = skipcomment(cp); - if (*cp++ != ')') - return (LT_IF); - } else if (isdigit((unsigned char)*cp)) { - debug("eval%d number", ops - eval_ops); - *valp = strtol(cp, &ep, 0); - cp = skipsym(cp); - } else if (strncmp(cp, "defined", 7) == 0 && endsym(cp[7])) { - cp = skipcomment(cp+7); - debug("eval%d defined", ops - eval_ops); - if (*cp++ != '(') - return (LT_IF); - cp = skipcomment(cp); - sym = findsym(cp); - if (sym < 0) - return (LT_IF); - *valp = (value[sym] != NULL); - cp = skipsym(cp); - cp = skipcomment(cp); - if (*cp++ != ')') - return (LT_IF); - keepthis = false; - } else if (!endsym(*cp)) { - debug("eval%d symbol", ops - eval_ops); - sym = findsym(cp); - if (sym < 0) - return (LT_IF); - if (value[sym] == NULL) - *valp = 0; - else { - *valp = strtol(value[sym], &ep, 0); - if (*ep != '\0' || ep == value[sym]) - return (LT_IF); - } - cp = skipsym(cp); - keepthis = false; - } else { - debug("eval%d bad expr", ops - eval_ops); - return (LT_IF); - } - - *cpp = cp; - debug("eval%d = %d", ops - eval_ops, *valp); - return (*valp ? LT_TRUE : LT_FALSE); -} - -/* - * 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; - - debug("eval%d", ops - eval_ops); - cp = *cpp; - if (ops->inner(ops+1, valp, &cp) == LT_IF) - return (LT_IF); - 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); - if (ops->inner(ops+1, &val, &cp) == LT_IF) - return (LT_IF); - *valp = op->fn(*valp, val); - } - - *cpp = cp; - debug("eval%d = %d", ops - eval_ops, *valp); - return (*valp ? LT_TRUE : LT_FALSE); -} - -/* - * 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; - int val; - - debug("eval %s", *cpp); - keepthis = killconsts ? false : true; - ret = eval_table(eval_ops, &val, cpp); - debug("eval = %d", val); - return (keepthis ? LT_IF : ret); -} - -/* - * 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, "\\\n", 2) == 0) - cp += 2; - else switch (incomment) { - case NO_COMMENT: - 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(" \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, "*\\\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 over an identifier. - */ -static const char * -skipsym(const char *cp) -{ - while (!endsym(*cp)) - ++cp; - return (cp); -} - -/* - * Look for the symbol in the symbol table. If is is found, we return - * 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) { - printf("%.*s\n", (int)(cp-str), str); - /* 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') - value[symind] = ""; - else - usage(); - } else { - if (*val != '\0') - usage(); - value[symind] = NULL; - } -} - -/* - * 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); - errx(2, "output may be truncated"); -} |