Release 4.10 scripts/unifdef.c

/*
 * Copyright (c) 2002 - 2011 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 <sys/types.h>
#include <sys/stat.h>

#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>


const char copyright[] =
    "@(#) $Version: unifdef-2.5 $\n"
    "@(#) $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"
};

/* 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

/*
 * For temporary filenames
 */

#define TEMPLATE        "unifdef.XXXXXX"

/*
 * 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             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 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 */


static char             tline[MAXLINE+EDITSLOP];
/* input buffer plus space */

static char            *keyword;		
/* used for editing #elif's */


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 = true;	
/* to format symdepth output */

static bool             firstsym;		
/* ditto */


static int              exitstat;		
/* program exit status */

static void             addsym(bool, bool, char *);
static void             closeout(void);
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         parseline(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      *skipargs(const char *);
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);
static void             version(void);


#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:I:o:bBcdeKklnsStV")) != -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 '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 'K': /* keep ambiguous #ifs */
			strictlogic = true;
			break;
		case 'k': /* process constant #ifs */
			killconsts = true;
			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': /* print version */
			version();
		default:
			usage();
		}
	argc -= optind;
	argv += optind;
	if (compblank && lnblank)
		errx(2, "-B and -b are mutually exclusive");
	if (argc > 1) {
		errx(2, "can only do one file");
	} else if (argc == 1 && strcmp(*argv, "-") != 0) {
		filename = *argv;
		input = fopen(filename, "rb");
		if (input == NULL)
			err(2, "can't open %s", filename);
	} else {
		filename = "[stdin]";
		input = stdin;
	}
	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);
		}
	}
	process();
	abort(); /* bug */
}

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static void

version(void)
{
	const char *c = copyright;
	for (;;) {
		while (*++c != '$')
			if (*c == '\0')
				exit(0);
		while (*++c != '$')
			putc(*c, stderr);
		putc('\n', stderr);
	}
}

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static void

usage(void)
{
	fprintf(stderr, "usage: unifdef [-bBcdeKknsStV] [-Ipath]"
	    " [-Dsym[=val]] [-Usym] [-iDsym[=val]] [-iUsym] ... [file]\n");
	exit(2);
}

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/*
 * 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 strncpy() 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"); }
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static void Eelse (void) { error("Inappropriate #else"); }
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static void Eendif(void) { error("Inappropriate #endif"); }
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static void Eeof  (void) { error("Premature EOF"); }
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static void Eioccc(void) { error("Obfuscated preprocessor control line"); }
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/* plain line handling */


static void print (void) { flushline(true); }
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static void drop  (void) { flushline(false); }
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/* output lacks group's start line */


static void Strue (void) { drop();  ignoreoff(); state(IS_TRUE_PREFIX); }
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static void Sfalse(void) { drop();  ignoreoff(); state(IS_FALSE_PREFIX); }
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static void Selse (void) { drop();               state(IS_TRUE_ELSE); }
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/* print/pass this block */


static void Pelif (void) { print(); ignoreoff(); state(IS_PASS_MIDDLE); }
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static void Pelse (void) { print();              state(IS_PASS_ELSE); }
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static void Pendif(void) { print(); unnest(); }
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/* discard this block */


static void Dfalse(void) { drop();  ignoreoff(); state(IS_FALSE_TRAILER); }
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static void Delif (void) { drop();  ignoreoff(); state(IS_FALSE_MIDDLE); }
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static void Delse (void) { drop();               state(IS_FALSE_ELSE); }
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static void Dendif(void) { drop();  unnest(); }
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/* first line of group */


static void Fdrop (void) { nest();  Dfalse(); }
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static void Fpass (void) { nest();  Pelif(); }
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static void Ftrue (void) { nest();  Strue(); }
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static void Ffalse(void) { nest();  Sfalse(); }
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/* variable pedantry for obfuscated lines */


static void Oiffy (void) { if (!iocccok) Eioccc(); Fpass(); ignoreon(); }
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static void Oif   (void) { if (!iocccok) Eioccc(); Fpass(); }
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static void Oelif (void) { if (!iocccok) Eioccc(); Pelif(); }
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/* ignore comments in this block */


static void Idrop (void) { Fdrop();  ignoreon(); }
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static void Itrue (void) { Ftrue();  ignoreon(); }
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static void Ifalse(void) { Ffalse(); ignoreon(); }
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/* modify this line */


static void Mpass (void) { strncpy(keyword, "if  ", 4); Pelif(); }
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static void Mtrue (void) { keywordedit("else");  state(IS_TRUE_MIDDLE); }
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static void Melif (void) { keywordedit("endif"); state(IS_FALSE_TRAILER); }
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sam ravnborg
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tony finch
tony finch
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static void Melse (void) { keywordedit("endif"); state(IS_FALSE_ELSE); }

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sam ravnborg
sam ravnborg
17
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tony finch
tony finch
1
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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,
  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];
}
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sam ravnborg
sam ravnborg
30
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static void

ignoreon(void)
{
	ignoring[depth] = true;
}
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sam ravnborg
sam ravnborg
15
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static void

keywordedit(const char *replacement)
{
	snprintf(keyword, tline + sizeof(tline) - keyword,
	    "%s%s", replacement, newline);
	print();
}
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sam ravnborg
sam ravnborg
24
70.59%
2
66.67%
tony finch
tony finch
10
29.41%
1
33.33%
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34
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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;
}
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sam ravnborg
sam ravnborg
28
63.64%
1
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tony finch
tony finch
16
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1
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static void

unnest(void)
{
	if (depth == 0)
		abort(); /* bug */
	depth -= 1;
}
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sam ravnborg
sam ravnborg
22
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22
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static void

state(Ifstate is)
{
	ifstate[depth] = is;
}

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sam ravnborg
sam ravnborg
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/*
 * Write a line to the output or not, according to command line options.
 */

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)
				printf("#line %d%s", linenum, newline);
			fputs(tline, output);
			delcount = 0;
			blankmax = blankcount = blankline ? blankcount + 1 : 0;
		}
	} else {
		if (lnblank)
			fputs(newline, output);
		exitstat = 1;
		delcount += 1;
		blankcount = 0;
	}
	if (debugging)
		fflush(output);
}

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tony finch
tony finch
70
51.85%
2
66.67%
sam ravnborg
sam ravnborg
65
48.15%
1
33.33%
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135
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3
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/*
 * The driver for the state machine.
 */

static void

process(void)
{
	/* When compressing blank lines, act as if the file
           is preceded by a large number of blank lines. */
	blankmax = blankcount = 1000;
	for (;;) {
		Linetype lineval = parseline();
		trans_table[ifstate[depth]][lineval]();
		debug("process line %d %s -> %s depth %d",
		    linenum, linetype_name[lineval],
		    ifstate_name[ifstate[depth]], depth);
	}
}

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tony finch
tony finch
50
79.37%
2
66.67%
sam ravnborg
sam ravnborg
13
20.63%
1
33.33%
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100.00%

/*
 * Flush the output and handle errors.
 */

static void

closeout(void)
{
	if (symdepth && !zerosyms)
		printf("\n");
	if (fclose(output) == EOF) {
		warn("couldn't write to %s", ofilename);
		if (overwriting) {
			unlink(tempname);
			errx(2, "%s unchanged", filename);
		} else {
			exit(2);
		}
	}
}

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tony finch
tony finch
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/*
 * 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);
}

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CommitProp
tony finch
tony finch
49
81.67%
1
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sam ravnborg
sam ravnborg
11
18.33%
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/*
 * 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;
	int kwlen;
	Linetype retval;
	Comment_state wascomment;

	linenum++;
	if (fgets(tline, MAXLINE, input) == NULL)