[PATCH] unifdef: update to upstream version 2.5

Fix a long-standing cpp compatibility bug. The -DFOO argument
(without an explicit value) should define FOO to 1 not to the empty
string.

Add a -o option to support overwriting a file in place, and a -S
option to list the nesting depth of symbols. Include line numbers
in debugging output. Support CRLF newlines.

Signed-off-by: Tony Finch <dot@dotat.at>

scripts/unifdef.c | 247 +++++++++++++++++++++++++++++++++++++++--
1 files changed, 184 insertions(+), 63 deletions(-)

diff --git a/scripts/unifdef.c b/scripts/unifdef.c
index 44d3978..7493c0e 100644
a/scripts/unifdef.c
+++ b/scripts/unifdef.c
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2002 - 2009 Tony Finch <dot@dotat.at>
+ * 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
@@ -24,23 +24,14 @@
*/

/*
+ * 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.
*
- * The latest version is available from http://dotat.at/prog/unifdef
- */
-
-static const char * const copyright[] = {
- "@(#) Copyright (c) 2002 - 2009 Tony Finch <dot@dotat.at>",
- "$dotat: unifdef/unifdef.c,v 1.190 2009/11/27 17:21:26 fanf2 Exp $",
-};
-
-/*
- * unifdef - remove ifdef'ed lines
- *
* Wishlist:
* provide an option which will append the name of the
* appropriate symbol after #else's and #endif's
@@ -48,12 +39,16 @@ static const char * const copyright[] = {
* #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.
+ * 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>
@@ -61,6 +56,12 @@ static const char * const copyright[] = {
#include <string.h>
#include <unistd.h>

+const char copyright[] + "@(#) $Version: unifdef-2.5 $"
+ "@(#) $Author: Tony Finch (dot@dotat.at) $"
+ "@(#) $URL: http://dotat.at/prog/unifdef $"
+;
+
/* types of input lines: */
typedef enum {
LT_TRUEI, /* a true #if with ignore flag */
@@ -153,6 +154,11 @@ static char const * const linestate_name[] = {
#define EDITSLOP 10

/*
+ * For temporary filenames
+ */
+#define TEMPLATE "unifdef.XXXXXX"
+
+/*
* Globals.
*/

@@ -165,6 +171,7 @@ 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 */
@@ -175,10 +182,18 @@ 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[] = "";
+static const char newline_crlf[] = "";
+
static Comment_state incomment; /* comment parser state */
static Line_state linestate; /* #if line parser state */
static Ifstate ifstate[MAXDEPTH]; /* #if processor state */
@@ -189,10 +204,13 @@ 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 *);
@@ -212,6 +230,7 @@ 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 != '_')

@@ -223,7 +242,7 @@ main(int argc, char *argv[])
{
int opt;

- while ((opt = getopt(argc, argv, "i:D:U:I:BbcdeKklnst")) != -1)
+ while ((opt = getopt(argc, argv, "i:D:U:I:o:bBcdeKklnsStV")) != -1)
switch (opt) {
case 'i': /* treat stuff controlled by these symbols as text */
/*
@@ -245,16 +264,15 @@ main(int argc, char *argv[])
case 'U': /* undef a symbol */
addsym(false, false, optarg);
break;
- case 'I':
- /* no-op for compatibility with cpp */
- break;
- case 'B': /* compress blank lines around removed section */
- compblank = true;
+ 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;
@@ -273,12 +291,20 @@ main(int argc, char *argv[])
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();
}
@@ -290,21 +316,68 @@ main(int argc, char *argv[])
errx(2, "can only do one file");
} else if (argc == 1 && strcmp(*argv, "-") != 0) {
filename = *argv;
- input = fopen(filename, "r");
+ 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 */
}

static void
+version(void)
+{
+ const char *c = copyright;
+ for (;;) {
+ while (*++c != '$')
+ if (*c == '\0')
+ exit(0);
+ while (*++c != '$')
+ putc(*c, stderr);
+ putc('', stderr);
+ }
+}
+
+static void
usage(void)
{
- fprintf(stderr, "usage: unifdef [-BbcdeKknst] [-Ipath]"
+ fprintf(stderr, "usage: unifdef [-bBcdeKknsStV] [-Ipath]"
" [-Dsym[=val]] [-Usym] [-iDsym[=val]] [-iUsym] ... [file]");
exit(2);
}
@@ -322,7 +395,8 @@ usage(void)
* 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.
+ * 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
@@ -375,11 +449,11 @@ static void Oelif (void) { if (!iocccok) Eioccc(); Pelif(); }
static void Idrop (void) { Fdrop(); ignoreon(); }
static void Itrue (void) { Ftrue(); ignoreon(); }
static void Ifalse(void) { Ffalse(); ignoreon(); }
-/* edit this line */
+/* modify this line */
static void Mpass (void) { strncpy(keyword, "if ", 4); Pelif(); }
-static void Mtrue (void) { keywordedit("else"); state(IS_TRUE_MIDDLE); }
-static void Melif (void) { keywordedit("endif"); state(IS_FALSE_TRAILER); }
-static void Melse (void) { keywordedit("endif"); state(IS_FALSE_ELSE); }
+static void Mtrue (void) { keywordedit("else"); state(IS_TRUE_MIDDLE); }
+static void Melif (void) { keywordedit("endif"); state(IS_FALSE_TRAILER); }
+static void Melse (void) { keywordedit("endif"); state(IS_FALSE_ELSE); }

static state_fn * const trans_table[IS_COUNT][LT_COUNT] = {
/* IS_OUTSIDE */
@@ -431,13 +505,6 @@ static state_fn * const trans_table[IS_COUNT][LT_COUNT] = {
* State machine utility functions
*/
static void
-done(void)
-{
- if (incomment)
- error("EOF in comment");
- exit(exitstat);
-}
-static void
ignoreoff(void)
{
if (depth == 0)
@@ -452,14 +519,8 @@ ignoreon(void)
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';
- }
+ snprintf(keyword, tline + sizeof(tline) - keyword,
+ "%s%s", replacement, newline);
print();
}
static void
@@ -494,24 +555,26 @@ flushline(bool keep)
if (symlist)
return;
if (keep ^ complement) {
- bool blankline = tline[strspn(tline, " \t")] == '\0';
+ bool blankline = tline[strspn(tline, " \t")] == '\0';
if (blankline && compblank && blankcount != blankmax) {
delcount += 1;
blankcount += 1;
} else {
if (lnnum && delcount > 0)
- printf("#line %d", linenum);
- fputs(tline, stdout);
+ printf("#line %d%s", linenum, newline);
+ fputs(tline, output);
delcount = 0;
blankmax = blankcount = blankline ? blankcount + 1 : 0;
}
} else {
if (lnblank)
- putc('', stdout);
+ fputs(newline, output);
exitstat = 1;
delcount += 1;
blankcount = 0;
}
+ if (debugging)
+ fflush(output);
}

/*
@@ -520,22 +583,55 @@ flushline(bool keep)
static void
process(void)
{
- Linetype lineval;
-
/* When compressing blank lines, act as if the file
is preceded by a large number of blank lines. */
blankmax = blankcount = 1000;
for (;;) {
- linenum++;
- lineval = parseline();
+ Linetype lineval = parseline();
trans_table[ifstate[depth]][lineval]();
- debug("process %s -> %s depth %d",
- linetype_name[lineval],
+ debug("process line %d %s -> %s depth %d",
+ linenum, linetype_name[lineval],
ifstate_name[ifstate[depth]], depth);
}
}

/*
+ * 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);
+}
+
+/*
* 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().
@@ -549,14 +645,22 @@ parseline(void)
Linetype retval;
Comment_state wascomment;

+ linenum++;
if (fgets(tline, MAXLINE, input) == NULL)
return (LT_EOF);
+ if (newline == NULL) {
+ if (strrchr(tline, '') == strrchr(tline, '') + 1)
+ newline = newline_crlf;
+ else
+ newline = newline_unix;
+ }
retval = LT_PLAIN;
wascomment = incomment;
cp = skipcomment(tline);
if (linestate == LS_START) {
if (*cp == '#') {
linestate = LS_HASH;
+ firstsym = true;
cp = skipcomment(cp + 1);
} else if (*cp != '\0')
linestate = LS_DIRTY;
@@ -566,7 +670,8 @@ parseline(void)
cp = skipsym(cp);
kwlen = cp - keyword;
/* no way can we deal with a continuation inside a keyword */
- if (strncmp(cp, "\\", 2) == 0)
+ if (strncmp(cp, "\\", 3) == 0 ||
+ strncmp(cp, "\\", 2) == 0)
Eioccc();
if (strlcmp("ifdef", keyword, kwlen) == 0 ||
strlcmp("ifndef", keyword, kwlen) == 0) {
@@ -617,9 +722,8 @@ parseline(void)
size_t len = cp - tline;
if (fgets(tline + len, MAXLINE - len, input) == NULL) {
/* append the missing newline */
- tline[len+0] = '';
- tline[len+1] = '\0';
- cp++;
+ strcpy(tline + len, newline);
+ cp += strlen(newline);
linestate = LS_START;
} else {
linestate = LS_DIRTY;
@@ -630,7 +734,7 @@ parseline(void)
while (*cp != '\0')
cp = skipcomment(cp + 1);
}
- debug("parser %s comment %s line",
+ debug("parser line %d state %s comment %s line", linenum,
comment_name[incomment], linestate_name[linestate]);
return (retval);
}
@@ -875,11 +979,16 @@ skipcomment(const char *cp)
}
while (*cp != '\0')
/* don't reset to LS_START after a line continuation */
- if (strncmp(cp, "\\", 2) == 0)
+ if (strncmp(cp, "\\", 3) == 0)
+ cp += 3;
+ else if (strncmp(cp, "\\", 2) == 0)
cp += 2;
else switch (incomment) {
case NO_COMMENT:
- if (strncmp(cp, "/\\", 3) == 0) {
+ if (strncmp(cp, "/\\", 4) == 0) {
+ incomment = STARTING_COMMENT;
+ cp += 4;
+ } else if (strncmp(cp, "/\\", 3) == 0) {
incomment = STARTING_COMMENT;
cp += 3;
} else if (strncmp(cp, "/*", 2) == 0) {
@@ -899,7 +1008,7 @@ skipcomment(const char *cp)
} else if (strncmp(cp, "", 1) == 0) {
linestate = LS_START;
cp += 1;
- } else if (strchr(" \t", *cp) != NULL) {
+ } else if (strchr(" \t", *cp) != NULL) {
cp += 1;
} else
return (cp);
@@ -931,7 +1040,10 @@ skipcomment(const char *cp)
cp += 1;
continue;
case C_COMMENT:
- if (strncmp(cp, "*\\", 3) == 0) {
+ if (strncmp(cp, "*\\", 4) == 0) {
+ incomment = FINISHING_COMMENT;
+ cp += 4;
+ } else if (strncmp(cp, "*\\", 3) == 0) {
incomment = FINISHING_COMMENT;
cp += 3;
} else if (strncmp(cp, "*/", 2) == 0) {
@@ -1015,7 +1127,13 @@ findsym(const char *str)
if (cp == str)
return (-1);
if (symlist) {
- printf("%.*s", (int)(cp-str), str);
+ if (symdepth && firstsym)
+ printf("%s%3d", zerosyms ? "" : "", depth);
+ firstsym = zerosyms = false;
+ printf("%s%.*s%s",
+ symdepth ? " " : "",
+ (int)(cp-str), str,
+ symdepth ? "" : "");
/* we don't care about the value of the symbol */
return (0);
}
@@ -1052,7 +1170,7 @@ addsym(bool ignorethis, bool definethis, char *sym)
value[symind] = val+1;
*val = '\0';
} else if (*val == '\0')
- value[symind] = "";
+ value[symind] = "1";
else
usage();
} else {
@@ -1060,6 +1178,8 @@ addsym(bool ignorethis, bool definethis, char *sym)
usage();
value[symind] = NULL;
}
+ debug("addsym %s=%s", symname[symind],
+ value[symind] ? value[symind] : "undef");
}

/*
@@ -1100,5 +1220,6 @@ error(const char *msg)
else
warnx("%s: %d: %s (#if line %d depth %d)",
filename, linenum, msg, stifline[depth], depth);
+ closeout();
errx(2, "output may be truncated");
}
1.7.3.GIT

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