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-rw-r--r--usr.bin/diff/diff.c402
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diff --git a/usr.bin/diff/diff.c b/usr.bin/diff/diff.c
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+/* $OpenBSD: diff.c,v 1.67 2019/06/28 13:35:00 deraadt Exp $ */
+
+/*
+ * Copyright (c) 2003 Todd C. Miller <millert@openbsd.org>
+ *
+ * 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>
+#include <sys/stat.h>
+
+#include <ctype.h>
+#include <err.h>
+#include <errno.h>
+#include <getopt.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdarg.h>
+#include <string.h>
+#include <unistd.h>
+#include <limits.h>
+
+#include "diff.h"
+#include "xmalloc.h"
+
+int Nflag, Pflag, rflag, sflag, Tflag;
+int diff_format, diff_context, status;
+char *start, *ifdefname, *diffargs, *label[2], *ignore_pats;
+struct stat stb1, stb2;
+struct excludes *excludes_list;
+regex_t ignore_re;
+
+#define OPTIONS "0123456789abC:cdD:efhI:iL:lnNPpqrS:sTtU:uwX:x:"
+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' },
+ { "ignore-matching-lines", required_argument, 0, 'I' },
+ { "ignore-case", no_argument, 0, 'i' },
+ { "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' },
+ { "exclude", required_argument, 0, 'x' },
+ { "exclude-from", required_argument, 0, 'X' },
+ { NULL, 0, 0, '\0'}
+};
+
+__dead void usage(void);
+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)
+{
+ char *ep, **oargv;
+ long l;
+ int ch, dflags, lastch, gotstdin, prevoptind, newarg;
+
+ oargv = argv;
+ gotstdin = 0;
+ dflags = 0;
+ lastch = '\0';
+ prevoptind = 1;
+ newarg = 1;
+ 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':
+ 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;
+ } else
+ diff_context = 3;
+ break;
+ case 'd':
+ dflags |= D_MINIMAL;
+ break;
+ case 'D':
+ diff_format = D_IFDEF;
+ ifdefname = optarg;
+ break;
+ case 'e':
+ diff_format = D_EDIT;
+ break;
+ case 'f':
+ diff_format = D_REVERSE;
+ break;
+ case 'h':
+ /* silently ignore for backwards compatibility */
+ 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 'N':
+ Nflag = 1;
+ break;
+ case 'n':
+ diff_format = D_NREVERSE;
+ break;
+ case 'p':
+ dflags |= D_PROTOTYPE;
+ break;
+ case 'P':
+ Pflag = 1;
+ break;
+ case 'r':
+ rflag = 1;
+ break;
+ case 'q':
+ 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':
+ 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;
+ } else
+ diff_context = 3;
+ break;
+ case 'w':
+ dflags |= D_IGNOREBLANKS;
+ break;
+ case 'X':
+ read_excludes_file(optarg);
+ break;
+ case 'x':
+ push_excludes(optarg);
+ break;
+ default:
+ usage();
+ break;
+ }
+ lastch = ch;
+ newarg = optind != prevoptind;
+ prevoptind = optind;
+ }
+ argc -= optind;
+ argv += optind;
+
+ if (pledge("stdio rpath tmppath", NULL) == -1)
+ err(2, "pledge");
+
+ /*
+ * 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)
+ err(2, "%s", argv[0]);
+ if (strcmp(argv[1], "-") == 0) {
+ fstat(STDIN_FILENO, &stb2);
+ gotstdin = 1;
+ } else if (stat(argv[1], &stb2) != 0)
+ err(2, "%s", argv[1]);
+ 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), 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--;
+ pattern = xmalloc(len + 1);
+ memcpy(pattern, buf, len);
+ pattern[len] = '\0';
+ 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, char *entry)
+{
+ 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;
+ }
+}
+
+__dead void
+usage(void)
+{
+ (void)fprintf(stderr,
+ "usage: diff [-abdipTtw] [-c | -e | -f | -n | -q | -u] [-I pattern] [-L label]\n"
+ " file1 file2\n"
+ " diff [-abdipTtw] [-I pattern] [-L label] -C number file1 file2\n"
+ " diff [-abditw] [-I pattern] -D string file1 file2\n"
+ " diff [-abdipTtw] [-I pattern] [-L label] -U number file1 file2\n"
+ " diff [-abdiNPprsTtw] [-c | -e | -f | -n | -q | -u] [-I pattern]\n"
+ " [-L label] [-S name] [-X file] [-x pattern] dir1 dir2\n");
+
+ exit(2);
+}
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