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freebsd-dev/usr.bin/diff/diff.c
Jamie Landeg-Jones fefb3c46a8 diff: fix incorrectly displaying files as duplicates 
When diff hits certain access errors, function diffreg() shows the error
message, and then returns to the calling function, which calls
print_status() with the return value.

However, in these cases, the return value isn't changed from the initial
default value of D_SAME.

Normally, print_status() with a value of D_SAME does nothing, so this
works out ok, however, if the "-s" flag is set, a message is displayed
showing identicality:

case D_SAME:
                if (sflag)
                        printf("Files %s%s and %s%s are identical\n",                                                                                                       path1, entry, path2, entry);
                break;

This then produces such results as:

% diff  -s /COPYRIGHT /var/run/rpcbind.sock
diff: /var/run/rpcbind.sock: Operation not supported
Files /COPYRIGHT and /var/run/rpcbind.sock are identical

% diff  -s /COPYRIGHT /etc/master.passwd
diff: /etc/master.passwd: Permission denied
Files /COPYRIGHT and /etc/master.passwd are identical

Create a D_ERROR status which is returned in such cases, and
print_status() then deals with that status seperately from D_SAME

PR:		252614
MFC after:	1 week
2021-01-25 20:38:18 +01:00

553 lines
14 KiB
C
Raw Blame History

/* $OpenBSD: diff.c,v 1.67 2019/06/28 13:35:00 deraadt Exp $ */
/*
* Copyright (c) 2003 Todd C. Miller <Todd.Miller@courtesan.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Sponsored in part by the Defense Advanced Research Projects
* Agency (DARPA) and Air Force Research Laboratory, Air Force
* Materiel Command, USAF, under agreement number F39502-99-1-0512.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/stat.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <getopt.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <limits.h>
#include "diff.h"
#include "xmalloc.h"
int lflag, Nflag, Pflag, rflag, sflag, Tflag, cflag, Wflag;
int diff_format, diff_context, status, ignore_file_case, suppress_common;
int tabsize = 8, width = 130;
char *start, *ifdefname, *diffargs, *label[2], *ignore_pats;
char *group_format = NULL;
struct stat stb1, stb2;
struct excludes *excludes_list;
regex_t ignore_re;
#define OPTIONS "0123456789aBbC:cdD:efHhI:iL:lnNPpqrS:sTtU:uwW:X:x:y"
enum {
OPT_TSIZE = CHAR_MAX + 1,
OPT_STRIPCR,
OPT_IGN_FN_CASE,
OPT_NO_IGN_FN_CASE,
OPT_NORMAL,
OPT_HORIZON_LINES,
OPT_CHANGED_GROUP_FORMAT,
OPT_SUPPRESS_COMMON,
};
static struct option longopts[] = {
{ "text", no_argument, 0, 'a' },
{ "ignore-space-change", no_argument, 0, 'b' },
{ "context", optional_argument, 0, 'C' },
{ "ifdef", required_argument, 0, 'D' },
{ "minimal", no_argument, 0, 'd' },
{ "ed", no_argument, 0, 'e' },
{ "forward-ed", no_argument, 0, 'f' },
{ "speed-large-files", no_argument, NULL, 'H' },
{ "ignore-blank-lines", no_argument, 0, 'B' },
{ "ignore-matching-lines", required_argument, 0, 'I' },
{ "ignore-case", no_argument, 0, 'i' },
{ "paginate", no_argument, NULL, 'l' },
{ "label", required_argument, 0, 'L' },
{ "new-file", no_argument, 0, 'N' },
{ "rcs", no_argument, 0, 'n' },
{ "unidirectional-new-file", no_argument, 0, 'P' },
{ "show-c-function", no_argument, 0, 'p' },
{ "brief", no_argument, 0, 'q' },
{ "recursive", no_argument, 0, 'r' },
{ "report-identical-files", no_argument, 0, 's' },
{ "starting-file", required_argument, 0, 'S' },
{ "expand-tabs", no_argument, 0, 't' },
{ "initial-tab", no_argument, 0, 'T' },
{ "unified", optional_argument, 0, 'U' },
{ "ignore-all-space", no_argument, 0, 'w' },
{ "width", required_argument, 0, 'W' },
{ "exclude", required_argument, 0, 'x' },
{ "exclude-from", required_argument, 0, 'X' },
{ "side-by-side", no_argument, NULL, 'y' },
{ "ignore-file-name-case", no_argument, NULL, OPT_IGN_FN_CASE },
{ "horizon-lines", required_argument, NULL, OPT_HORIZON_LINES },
{ "no-ignore-file-name-case", no_argument, NULL, OPT_NO_IGN_FN_CASE },
{ "normal", no_argument, NULL, OPT_NORMAL },
{ "strip-trailing-cr", no_argument, NULL, OPT_STRIPCR },
{ "tabsize", required_argument, NULL, OPT_TSIZE },
{ "changed-group-format", required_argument, NULL, OPT_CHANGED_GROUP_FORMAT},
{ "suppress-common-lines", no_argument, NULL, OPT_SUPPRESS_COMMON },
{ NULL, 0, 0, '\0'}
};
void usage(void) __dead2;
void conflicting_format(void) __dead2;
void push_excludes(char *);
void push_ignore_pats(char *);
void read_excludes_file(char *file);
void set_argstr(char **, char **);
int
main(int argc, char **argv)
{
const char *errstr = NULL;
char *ep, **oargv;
long l;
int ch, dflags, lastch, gotstdin, prevoptind, newarg;
oargv = argv;
gotstdin = 0;
dflags = 0;
lastch = '\0';
prevoptind = 1;
newarg = 1;
diff_context = 3;
diff_format = D_UNSET;
#define FORMAT_MISMATCHED(type) \
(diff_format != D_UNSET && diff_format != (type))
while ((ch = getopt_long(argc, argv, OPTIONS, longopts, NULL)) != -1) {
switch (ch) {
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
if (newarg)
usage(); /* disallow -[0-9]+ */
else if (lastch == 'c' || lastch == 'u')
diff_context = 0;
else if (!isdigit(lastch) || diff_context > INT_MAX / 10)
usage();
diff_context = (diff_context * 10) + (ch - '0');
break;
case 'a':
dflags |= D_FORCEASCII;
break;
case 'b':
dflags |= D_FOLDBLANKS;
break;
case 'C':
case 'c':
if (FORMAT_MISMATCHED(D_CONTEXT))
conflicting_format();
cflag = 1;
diff_format = D_CONTEXT;
if (optarg != NULL) {
l = strtol(optarg, &ep, 10);
if (*ep != '\0' || l < 0 || l >= INT_MAX)
usage();
diff_context = (int)l;
}
break;
case 'd':
dflags |= D_MINIMAL;
break;
case 'D':
if (FORMAT_MISMATCHED(D_IFDEF))
conflicting_format();
diff_format = D_IFDEF;
ifdefname = optarg;
break;
case 'e':
if (FORMAT_MISMATCHED(D_EDIT))
conflicting_format();
diff_format = D_EDIT;
break;
case 'f':
if (FORMAT_MISMATCHED(D_REVERSE))
conflicting_format();
diff_format = D_REVERSE;
break;
case 'H':
/* ignore but needed for compatibility with GNU diff */
break;
case 'h':
/* silently ignore for backwards compatibility */
break;
case 'B':
dflags |= D_SKIPBLANKLINES;
break;
case 'I':
push_ignore_pats(optarg);
break;
case 'i':
dflags |= D_IGNORECASE;
break;
case 'L':
if (label[0] == NULL)
label[0] = optarg;
else if (label[1] == NULL)
label[1] = optarg;
else
usage();
break;
case 'l':
lflag = 1;
break;
case 'N':
Nflag = 1;
break;
case 'n':
if (FORMAT_MISMATCHED(D_NREVERSE))
conflicting_format();
diff_format = D_NREVERSE;
break;
case 'p':
dflags |= D_PROTOTYPE;
break;
case 'P':
Pflag = 1;
break;
case 'r':
rflag = 1;
break;
case 'q':
if (FORMAT_MISMATCHED(D_BRIEF))
conflicting_format();
diff_format = D_BRIEF;
break;
case 'S':
start = optarg;
break;
case 's':
sflag = 1;
break;
case 'T':
Tflag = 1;
break;
case 't':
dflags |= D_EXPANDTABS;
break;
case 'U':
case 'u':
if (FORMAT_MISMATCHED(D_UNIFIED))
conflicting_format();
diff_format = D_UNIFIED;
if (optarg != NULL) {
l = strtol(optarg, &ep, 10);
if (*ep != '\0' || l < 0 || l >= INT_MAX)
usage();
diff_context = (int)l;
}
break;
case 'w':
dflags |= D_IGNOREBLANKS;
break;
case 'W':
Wflag = 1;
width = (int) strtonum(optarg, 1, INT_MAX, &errstr);
if (errstr) {
warnx("Invalid argument for width");
usage();
}
break;
case 'X':
read_excludes_file(optarg);
break;
case 'x':
push_excludes(optarg);
break;
case 'y':
if (FORMAT_MISMATCHED(D_SIDEBYSIDE))
conflicting_format();
diff_format = D_SIDEBYSIDE;
break;
case OPT_CHANGED_GROUP_FORMAT:
if (FORMAT_MISMATCHED(D_GFORMAT))
conflicting_format();
diff_format = D_GFORMAT;
group_format = optarg;
break;
case OPT_HORIZON_LINES:
break; /* XXX TODO for compatibility with GNU diff3 */
case OPT_IGN_FN_CASE:
ignore_file_case = 1;
break;
case OPT_NO_IGN_FN_CASE:
ignore_file_case = 0;
break;
case OPT_NORMAL:
if (FORMAT_MISMATCHED(D_NORMAL))
conflicting_format();
diff_format = D_NORMAL;
break;
case OPT_TSIZE:
tabsize = (int) strtonum(optarg, 1, INT_MAX, &errstr);
if (errstr) {
warnx("Invalid argument for tabsize");
usage();
}
break;
case OPT_STRIPCR:
dflags |= D_STRIPCR;
break;
case OPT_SUPPRESS_COMMON:
suppress_common = 1;
break;
default:
usage();
break;
}
lastch = ch;
newarg = optind != prevoptind;
prevoptind = optind;
}
if (diff_format == D_UNSET && (dflags & D_PROTOTYPE) != 0)
diff_format = D_CONTEXT;
if (diff_format == D_UNSET)
diff_format = D_NORMAL;
argc -= optind;
argv += optind;
#ifdef __OpenBSD__
if (pledge("stdio rpath tmppath", NULL) == -1)
err(2, "pledge");
#endif
/*
* Do sanity checks, fill in stb1 and stb2 and call the appropriate
* driver routine. Both drivers use the contents of stb1 and stb2.
*/
if (argc != 2)
usage();
if (ignore_pats != NULL) {
char buf[BUFSIZ];
int error;
if ((error = regcomp(&ignore_re, ignore_pats,
REG_NEWLINE | REG_EXTENDED)) != 0) {
regerror(error, &ignore_re, buf, sizeof(buf));
if (*ignore_pats != '\0')
errx(2, "%s: %s", ignore_pats, buf);
else
errx(2, "%s", buf);
}
}
if (strcmp(argv[0], "-") == 0) {
fstat(STDIN_FILENO, &stb1);
gotstdin = 1;
} else if (stat(argv[0], &stb1) != 0) {
if (!Nflag || errno != ENOENT)
err(2, "%s", argv[0]);
dflags |= D_EMPTY1;
memset(&stb1, 0, sizeof(struct stat));
}
if (strcmp(argv[1], "-") == 0) {
fstat(STDIN_FILENO, &stb2);
gotstdin = 1;
} else if (stat(argv[1], &stb2) != 0) {
if (!Nflag || errno != ENOENT)
err(2, "%s", argv[1]);
dflags |= D_EMPTY2;
memset(&stb2, 0, sizeof(stb2));
stb2.st_mode = stb1.st_mode;
}
if (dflags & D_EMPTY1 && dflags & D_EMPTY2){
warn("%s", argv[0]);
warn("%s", argv[1]);
exit(2);
}
if (stb1.st_mode == 0)
stb1.st_mode = stb2.st_mode;
if (gotstdin && (S_ISDIR(stb1.st_mode) || S_ISDIR(stb2.st_mode)))
errx(2, "can't compare - to a directory");
set_argstr(oargv, argv);
if (S_ISDIR(stb1.st_mode) && S_ISDIR(stb2.st_mode)) {
if (diff_format == D_IFDEF)
errx(2, "-D option not supported with directories");
diffdir(argv[0], argv[1], dflags);
} else {
if (S_ISDIR(stb1.st_mode)) {
argv[0] = splice(argv[0], argv[1]);
if (stat(argv[0], &stb1) == -1)
err(2, "%s", argv[0]);
}
if (S_ISDIR(stb2.st_mode)) {
argv[1] = splice(argv[1], argv[0]);
if (stat(argv[1], &stb2) == -1)
err(2, "%s", argv[1]);
}
print_status(diffreg(argv[0], argv[1], dflags, 1), argv[0],
argv[1], "");
}
exit(status);
}
void
set_argstr(char **av, char **ave)
{
size_t argsize;
char **ap;
argsize = 4 + *ave - *av + 1;
diffargs = xmalloc(argsize);
strlcpy(diffargs, "diff", argsize);
for (ap = av + 1; ap < ave; ap++) {
if (strcmp(*ap, "--") != 0) {
strlcat(diffargs, " ", argsize);
strlcat(diffargs, *ap, argsize);
}
}
}
/*
* Read in an excludes file and push each line.
*/
void
read_excludes_file(char *file)
{
FILE *fp;
char *buf, *pattern;
size_t len;
if (strcmp(file, "-") == 0)
fp = stdin;
else if ((fp = fopen(file, "r")) == NULL)
err(2, "%s", file);
while ((buf = fgetln(fp, &len)) != NULL) {
if (buf[len - 1] == '\n')
len--;
if ((pattern = strndup(buf, len)) == NULL)
err(2, "xstrndup");
push_excludes(pattern);
}
if (strcmp(file, "-") != 0)
fclose(fp);
}
/*
* Push a pattern onto the excludes list.
*/
void
push_excludes(char *pattern)
{
struct excludes *entry;
entry = xmalloc(sizeof(*entry));
entry->pattern = pattern;
entry->next = excludes_list;
excludes_list = entry;
}
void
push_ignore_pats(char *pattern)
{
size_t len;
if (ignore_pats == NULL)
ignore_pats = xstrdup(pattern);
else {
/* old + "|" + new + NUL */
len = strlen(ignore_pats) + strlen(pattern) + 2;
ignore_pats = xreallocarray(ignore_pats, 1, len);
strlcat(ignore_pats, "|", len);
strlcat(ignore_pats, pattern, len);
}
}
void
print_only(const char *path, size_t dirlen, const char *entry)
{
if (dirlen > 1)
dirlen--;
printf("Only in %.*s: %s\n", (int)dirlen, path, entry);
}
void
print_status(int val, char *path1, char *path2, const char *entry)
{
if (label[0] != NULL) path1 = label[0];
if (label[1] != NULL) path2 = label[1];
switch (val) {
case D_BINARY:
printf("Binary files %s%s and %s%s differ\n",
path1, entry, path2, entry);
break;
case D_DIFFER:
if (diff_format == D_BRIEF)
printf("Files %s%s and %s%s differ\n",
path1, entry, path2, entry);
break;
case D_SAME:
if (sflag)
printf("Files %s%s and %s%s are identical\n",
path1, entry, path2, entry);
break;
case D_MISMATCH1:
printf("File %s%s is a directory while file %s%s is a regular file\n",
path1, entry, path2, entry);
break;
case D_MISMATCH2:
printf("File %s%s is a regular file while file %s%s is a directory\n",
path1, entry, path2, entry);
break;
case D_SKIPPED1:
printf("File %s%s is not a regular file or directory and was skipped\n",
path1, entry);
break;
case D_SKIPPED2:
printf("File %s%s is not a regular file or directory and was skipped\n",
path2, entry);
break;
case D_ERROR:
break;
}
}
void
usage(void)
{
(void)fprintf(stderr,
"usage: diff [-aBbdilpTtw] [-c | -e | -f | -n | -q | -u] [--ignore-case]\n"
" [--no-ignore-case] [--normal] [--strip-trailing-cr] [--tabsize]\n"
" [-I pattern] [-L label] file1 file2\n"
" diff [-aBbdilpTtw] [-I pattern] [-L label] [--ignore-case]\n"
" [--no-ignore-case] [--normal] [--strip-trailing-cr] [--tabsize]\n"
" -C number file1 file2\n"
" diff [-aBbdiltw] [-I pattern] [--ignore-case] [--no-ignore-case]\n"
" [--normal] [--strip-trailing-cr] [--tabsize] -D string file1 file2\n"
" diff [-aBbdilpTtw] [-I pattern] [-L label] [--ignore-case]\n"
" [--no-ignore-case] [--normal] [--tabsize] [--strip-trailing-cr]\n"
" -U number file1 file2\n"
" diff [-aBbdilNPprsTtw] [-c | -e | -f | -n | -q | -u] [--ignore-case]\n"
" [--no-ignore-case] [--normal] [--tabsize] [-I pattern] [-L label]\n"
" [-S name] [-X file] [-x pattern] dir1 dir2\n"
" diff [-aBbditwW] [--expand-tabs] [--ignore-all-blanks]\n"
" [--ignore-blank-lines] [--ignore-case] [--minimal]\n"
" [--no-ignore-file-name-case] [--strip-trailing-cr]\n"
" [--suppress-common-lines] [--tabsize] [--text] [--width]\n"
" -y | --side-by-side file1 file2\n");
exit(2);
}
void
conflicting_format(void)
{
fprintf(stderr, "error: conflicting output format options.\n");
usage();
}
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