OpenBSD-4.6/usr.bin/rcs/rcsdiff.c
/* $OpenBSD: rcsdiff.c,v 1.75 2007/07/03 00:56:23 ray Exp $ */
/*
* Copyright (c) 2005 Joris Vink <joris@openbsd.org>
* 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. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED ``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 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/stat.h>
#include <err.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "rcsprog.h"
#include "diff.h"
static int rcsdiff_file(RCSFILE *, RCSNUM *, const char *, int);
static int rcsdiff_rev(RCSFILE *, RCSNUM *, RCSNUM *, int);
static void push_ignore_pats(char *);
static int quiet;
static int kflag = RCS_KWEXP_ERR;
static char *diff_ignore_pats;
int
rcsdiff_main(int argc, char **argv)
{
int fd, i, ch, dflags, status;
RCSNUM *rev1, *rev2;
RCSFILE *file;
char fpath[MAXPATHLEN], *rev_str1, *rev_str2;
const char *errstr;
rev1 = rev2 = NULL;
rev_str1 = rev_str2 = NULL;
status = D_SAME;
dflags = 0;
if (strlcpy(diffargs, "diff", sizeof(diffargs)) >= sizeof(diffargs))
errx(D_ERROR, "diffargs too long");
while ((ch = rcs_getopt(argc, argv, "abC:cdI:ik:npqr:TtU:uVwx::z::")) != -1) {
switch (ch) {
case 'a':
if (strlcat(diffargs, " -a", sizeof(diffargs)) >=
sizeof(diffargs))
errx(D_ERROR, "diffargs too long");
dflags |= D_FORCEASCII;
break;
case 'b':
if (strlcat(diffargs, " -b", sizeof(diffargs)) >=
sizeof(diffargs))
errx(D_ERROR, "diffargs too long");
dflags |= D_FOLDBLANKS;
break;
case 'C':
(void)strlcat(diffargs, " -C", sizeof(diffargs));
if (strlcat(diffargs, rcs_optarg, sizeof(diffargs)) >=
sizeof(diffargs))
errx(D_ERROR, "diffargs too long");
diff_context = strtonum(rcs_optarg, 0, INT_MAX, &errstr);
if (errstr)
errx(D_ERROR, "context is %s: %s",
errstr, rcs_optarg);
diff_format = D_CONTEXT;
break;
case 'c':
if (strlcat(diffargs, " -c", sizeof(diffargs)) >=
sizeof(diffargs))
errx(D_ERROR, "diffargs too long");
diff_format = D_CONTEXT;
break;
case 'd':
if (strlcat(diffargs, " -d", sizeof(diffargs)) >=
sizeof(diffargs))
errx(D_ERROR, "diffargs too long");
dflags |= D_MINIMAL;
break;
case 'i':
if (strlcat(diffargs, " -i", sizeof(diffargs)) >=
sizeof(diffargs))
errx(D_ERROR, "diffargs too long");
dflags |= D_IGNORECASE;
break;
case 'I':
(void)strlcat(diffargs, " -I", sizeof(diffargs));
if (strlcat(diffargs, rcs_optarg, sizeof(diffargs)) >=
sizeof(diffargs))
errx(D_ERROR, "diffargs too long");
push_ignore_pats(rcs_optarg);
break;
case 'k':
kflag = rcs_kflag_get(rcs_optarg);
if (RCS_KWEXP_INVAL(kflag)) {
warnx("invalid RCS keyword substitution mode");
(usage)();
exit(D_ERROR);
}
break;
case 'n':
if (strlcat(diffargs, " -n", sizeof(diffargs)) >=
sizeof(diffargs))
errx(D_ERROR, "diffargs too long");
diff_format = D_RCSDIFF;
break;
case 'p':
if (strlcat(diffargs, " -p", sizeof(diffargs)) >=
sizeof(diffargs))
errx(D_ERROR, "diffargs too long");
dflags |= D_PROTOTYPE;
break;
case 'q':
quiet = 1;
break;
case 'r':
rcs_setrevstr2(&rev_str1, &rev_str2, rcs_optarg);
break;
case 'T':
/*
* kept for compatibility
*/
break;
case 't':
if (strlcat(diffargs, " -t", sizeof(diffargs)) >=
sizeof(diffargs))
errx(D_ERROR, "diffargs too long");
dflags |= D_EXPANDTABS;
break;
case 'U':
(void)strlcat(diffargs, " -U", sizeof(diffargs));
if (strlcat(diffargs, rcs_optarg, sizeof(diffargs)) >=
sizeof(diffargs))
errx(D_ERROR, "diffargs too long");
diff_context = strtonum(rcs_optarg, 0, INT_MAX, &errstr);
if (errstr)
errx(D_ERROR, "context is %s: %s",
errstr, rcs_optarg);
diff_format = D_UNIFIED;
break;
case 'u':
if (strlcat(diffargs, " -u", sizeof(diffargs)) >=
sizeof(diffargs))
errx(D_ERROR, "diffargs too long");
diff_format = D_UNIFIED;
break;
case 'V':
printf("%s\n", rcs_version);
exit(0);
case 'w':
if (strlcat(diffargs, " -w", sizeof(diffargs)) >=
sizeof(diffargs))
errx(D_ERROR, "diffargs too long");
dflags |= D_IGNOREBLANKS;
break;
case 'x':
/* Use blank extension if none given. */
rcs_suffixes = rcs_optarg ? rcs_optarg : "";
break;
case 'z':
timezone_flag = rcs_optarg;
break;
default:
(usage)();
exit(D_ERROR);
}
}
argc -= rcs_optind;
argv += rcs_optind;
if (argc == 0) {
warnx("no input file");
(usage)();
exit(D_ERROR);
}
if (diff_ignore_pats != NULL) {
char buf[BUFSIZ];
int error;
diff_ignore_re = xmalloc(sizeof(*diff_ignore_re));
if ((error = regcomp(diff_ignore_re, diff_ignore_pats,
REG_NEWLINE | REG_EXTENDED)) != 0) {
regerror(error, diff_ignore_re, buf, sizeof(buf));
if (*diff_ignore_pats != '\0')
errx(D_ERROR, "%s: %s", diff_ignore_pats, buf);
else
errx(D_ERROR, "%s", buf);
}
}
for (i = 0; i < argc; i++) {
fd = rcs_choosefile(argv[i], fpath, sizeof(fpath));
if (fd < 0) {
warn("%s", fpath);
continue;
}
if ((file = rcs_open(fpath, fd,
RCS_READ|RCS_PARSE_FULLY)) == NULL)
continue;
rcs_kwexp_set(file, kflag);
if (rev_str1 != NULL) {
if ((rev1 = rcs_getrevnum(rev_str1, file)) == NULL)
errx(D_ERROR, "bad revision number");
}
if (rev_str2 != NULL) {
if ((rev2 = rcs_getrevnum(rev_str2, file)) == NULL)
errx(D_ERROR, "bad revision number");
}
if (!quiet) {
fprintf(stderr, "%s\n", RCS_DIFF_DIV);
fprintf(stderr, "RCS file: %s\n", fpath);
}
diff_file = argv[i];
/* No revisions given. */
if (rev_str1 == NULL)
status = rcsdiff_file(file, file->rf_head, argv[i],
dflags);
/* One revision given. */
else if (rev_str2 == NULL)
status = rcsdiff_file(file, rev1, argv[i], dflags);
/* Two revisions given. */
else
status = rcsdiff_rev(file, rev1, rev2, dflags);
rcs_close(file);
if (rev1 != NULL) {
rcsnum_free(rev1);
rev1 = NULL;
}
if (rev2 != NULL) {
rcsnum_free(rev2);
rev2 = NULL;
}
}
return (status);
}
void
rcsdiff_usage(void)
{
fprintf(stderr,
"usage: rcsdiff [-cnquV] [-kmode] [-rrev] [-xsuffixes] [-ztz]\n"
" [diff_options] file ...\n");
}
static int
rcsdiff_file(RCSFILE *file, RCSNUM *rev, const char *filename, int dflags)
{
int ret, fd;
time_t t;
struct stat st;
char *path1, *path2;
BUF *b1, *b2;
char rbuf[RCS_REV_BUFSZ];
struct tm *tb;
struct timeval tv[2], tv2[2];
memset(&tv, 0, sizeof(tv));
memset(&tv2, 0, sizeof(tv2));
ret = D_ERROR;
b1 = b2 = NULL;
diff_rev1 = rev;
diff_rev2 = NULL;
path1 = path2 = NULL;
if ((fd = open(filename, O_RDONLY)) == -1) {
warn("%s", filename);
goto out;
}
rcsnum_tostr(rev, rbuf, sizeof(rbuf));
if (!quiet) {
fprintf(stderr, "retrieving revision %s\n", rbuf);
fprintf(stderr, "%s -r%s %s\n", diffargs, rbuf, filename);
}
if ((b1 = rcs_getrev(file, rev)) == NULL) {
warnx("failed to retrieve revision %s", rbuf);
goto out;
}
b1 = rcs_kwexp_buf(b1, file, rev);
tv[0].tv_sec = (long)rcs_rev_getdate(file, rev);
tv[1].tv_sec = tv[0].tv_sec;
if ((b2 = rcs_buf_load(filename, BUF_AUTOEXT)) == NULL) {
warnx("failed to load file: `%s'", filename);
goto out;
}
/* XXX - GNU uses GMT */
if (fstat(fd, &st) == -1)
err(D_ERROR, "%s", filename);
tb = gmtime(&st.st_mtime);
t = mktime(tb);
tv2[0].tv_sec = t;
tv2[1].tv_sec = t;
(void)xasprintf(&path1, "%s/diff1.XXXXXXXXXX", rcs_tmpdir);
rcs_buf_write_stmp(b1, path1);
rcs_buf_free(b1);
b1 = NULL;
if (utimes(path1, (const struct timeval *)&tv) < 0)
warn("utimes");
(void)xasprintf(&path2, "%s/diff2.XXXXXXXXXX", rcs_tmpdir);
rcs_buf_write_stmp(b2, path2);
rcs_buf_free(b2);
b2 = NULL;
if (utimes(path2, (const struct timeval *)&tv2) < 0)
warn("utimes");
ret = diffreg(path1, path2, NULL, dflags);
out:
if (fd != -1)
(void)close(fd);
if (b1 != NULL)
rcs_buf_free(b1);
if (b2 != NULL)
rcs_buf_free(b2);
if (path1 != NULL)
xfree(path1);
if (path2 != NULL)
xfree(path2);
return (ret);
}
static int
rcsdiff_rev(RCSFILE *file, RCSNUM *rev1, RCSNUM *rev2, int dflags)
{
struct timeval tv[2], tv2[2];
BUF *b1, *b2;
int ret;
char *path1, *path2, rbuf1[RCS_REV_BUFSZ], rbuf2[RCS_REV_BUFSZ];
ret = D_ERROR;
b1 = b2 = NULL;
memset(&tv, 0, sizeof(tv));
memset(&tv2, 0, sizeof(tv2));
diff_rev1 = rev1;
diff_rev2 = rev2;
path1 = path2 = NULL;
rcsnum_tostr(rev1, rbuf1, sizeof(rbuf1));
if (!quiet)
fprintf(stderr, "retrieving revision %s\n", rbuf1);
if ((b1 = rcs_getrev(file, rev1)) == NULL) {
warnx("failed to retrieve revision %s", rbuf1);
goto out;
}
b1 = rcs_kwexp_buf(b1, file, rev1);
tv[0].tv_sec = (long)rcs_rev_getdate(file, rev1);
tv[1].tv_sec = tv[0].tv_sec;
rcsnum_tostr(rev2, rbuf2, sizeof(rbuf2));
if (!quiet)
fprintf(stderr, "retrieving revision %s\n", rbuf2);
if ((b2 = rcs_getrev(file, rev2)) == NULL) {
warnx("failed to retrieve revision %s", rbuf2);
goto out;
}
b2 = rcs_kwexp_buf(b2, file, rev2);
tv2[0].tv_sec = (long)rcs_rev_getdate(file, rev2);
tv2[1].tv_sec = tv2[0].tv_sec;
if (!quiet)
fprintf(stderr, "%s -r%s -r%s\n", diffargs, rbuf1, rbuf2);
(void)xasprintf(&path1, "%s/diff1.XXXXXXXXXX", rcs_tmpdir);
rcs_buf_write_stmp(b1, path1);
rcs_buf_free(b1);
b1 = NULL;
if (utimes(path1, (const struct timeval *)&tv) < 0)
warn("utimes");
(void)xasprintf(&path2, "%s/diff2.XXXXXXXXXX", rcs_tmpdir);
rcs_buf_write_stmp(b2, path2);
rcs_buf_free(b2);
b2 = NULL;
if (utimes(path2, (const struct timeval *)&tv2) < 0)
warn("utimes");
ret = diffreg(path1, path2, NULL, dflags);
out:
if (b1 != NULL)
rcs_buf_free(b1);
if (b2 != NULL)
rcs_buf_free(b2);
if (path1 != NULL)
xfree(path1);
if (path2 != NULL)
xfree(path2);
return (ret);
}
static void
push_ignore_pats(char *pattern)
{
size_t len;
if (diff_ignore_pats == NULL) {
len = strlen(pattern) + 1;
diff_ignore_pats = xmalloc(len);
strlcpy(diff_ignore_pats, pattern, len);
} else {
/* old + "|" + new + NUL */
len = strlen(diff_ignore_pats) + strlen(pattern) + 2;
diff_ignore_pats = xrealloc(diff_ignore_pats, len, 1);
strlcat(diff_ignore_pats, "|", len);
strlcat(diff_ignore_pats, pattern, len);
}
}