414 lines
10 KiB
C
414 lines
10 KiB
C
/* $OpenBSD: diff.c,v 1.56 2010/02/21 15:24:01 sobrado Exp $ */
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/*
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* Copyright (c) 2003 Todd C. Miller <Todd.Miller@courtesan.com>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* Sponsored in part by the Defense Advanced Research Projects
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* Agency (DARPA) and Air Force Research Laboratory, Air Force
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* Materiel Command, USAF, under agreement number F39502-99-1-0512.
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*/
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <getopt.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <stdarg.h>
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#include <string.h>
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#include <unistd.h>
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#include "diff.h"
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#include "xmalloc.h"
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int lflag, Nflag, Pflag, rflag, sflag, Tflag;
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int diff_format, diff_context, status;
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char *start, *ifdefname, *diffargs, *label[2], *ignore_pats;
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struct stat stb1, stb2;
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struct excludes *excludes_list;
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regex_t ignore_re;
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#define OPTIONS "0123456789abC:cdD:efhI:iL:lnNPpqrS:sTtU:uwX:x:"
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static struct option longopts[] = {
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{ "text", no_argument, 0, 'a' },
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{ "ignore-space-change", no_argument, 0, 'b' },
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{ "context", optional_argument, 0, 'C' },
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{ "ifdef", required_argument, 0, 'D' },
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{ "minimal", no_argument, 0, 'd' },
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{ "ed", no_argument, 0, 'e' },
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{ "forward-ed", no_argument, 0, 'f' },
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{ "ignore-matching-lines", required_argument, 0, 'I' },
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{ "ignore-case", no_argument, 0, 'i' },
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{ "paginate", no_argument, 0, 'l' },
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{ "label", required_argument, 0, 'L' },
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{ "new-file", no_argument, 0, 'N' },
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{ "rcs", no_argument, 0, 'n' },
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{ "unidirectional-new-file", no_argument, 0, 'P' },
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{ "show-c-function", no_argument, 0, 'p' },
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{ "brief", no_argument, 0, 'q' },
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{ "recursive", no_argument, 0, 'r' },
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{ "report-identical-files", no_argument, 0, 's' },
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{ "starting-file", required_argument, 0, 'S' },
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{ "expand-tabs", no_argument, 0, 't' },
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{ "initial-tab", no_argument, 0, 'T' },
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{ "unified", optional_argument, 0, 'U' },
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{ "ignore-all-space", no_argument, 0, 'w' },
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{ "exclude", required_argument, 0, 'x' },
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{ "exclude-from", required_argument, 0, 'X' },
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{ NULL, 0, 0, '\0'}
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};
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__dead void usage(void);
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void push_excludes(char *);
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void push_ignore_pats(char *);
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void read_excludes_file(char *file);
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void set_argstr(char **, char **);
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int
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main(int argc, char **argv)
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{
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char *ep, **oargv;
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long l;
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int ch, dflags, lastch, gotstdin, prevoptind, newarg;
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oargv = argv;
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gotstdin = 0;
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dflags = 0;
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lastch = '\0';
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prevoptind = 1;
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newarg = 1;
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while ((ch = getopt_long(argc, argv, OPTIONS, longopts, NULL)) != -1) {
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switch (ch) {
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case '0': case '1': case '2': case '3': case '4':
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case '5': case '6': case '7': case '8': case '9':
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if (newarg)
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usage(); /* disallow -[0-9]+ */
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else if (lastch == 'c' || lastch == 'u')
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diff_context = 0;
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else if (!isdigit(lastch) || diff_context > INT_MAX / 10)
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usage();
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diff_context = (diff_context * 10) + (ch - '0');
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break;
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case 'a':
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dflags |= D_FORCEASCII;
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break;
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case 'b':
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dflags |= D_FOLDBLANKS;
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break;
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case 'C':
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case 'c':
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diff_format = D_CONTEXT;
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if (optarg != NULL) {
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l = strtol(optarg, &ep, 10);
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if (*ep != '\0' || l < 0 || l >= INT_MAX)
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usage();
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diff_context = (int)l;
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} else
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diff_context = 3;
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break;
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case 'd':
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dflags |= D_MINIMAL;
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break;
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case 'D':
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diff_format = D_IFDEF;
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ifdefname = optarg;
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break;
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case 'e':
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diff_format = D_EDIT;
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break;
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case 'f':
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diff_format = D_REVERSE;
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break;
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case 'h':
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/* silently ignore for backwards compatibility */
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break;
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case 'I':
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push_ignore_pats(optarg);
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break;
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case 'i':
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dflags |= D_IGNORECASE;
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break;
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case 'L':
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if (label[0] == NULL)
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label[0] = optarg;
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else if (label[1] == NULL)
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label[1] = optarg;
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else
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usage();
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break;
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case 'l':
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lflag = 1;
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signal(SIGPIPE, SIG_IGN);
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break;
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case 'N':
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Nflag = 1;
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break;
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case 'n':
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diff_format = D_NREVERSE;
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break;
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case 'p':
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dflags |= D_PROTOTYPE;
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break;
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case 'P':
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Pflag = 1;
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break;
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case 'r':
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rflag = 1;
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break;
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case 'q':
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diff_format = D_BRIEF;
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break;
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case 'S':
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start = optarg;
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break;
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case 's':
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sflag = 1;
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break;
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case 'T':
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Tflag = 1;
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break;
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case 't':
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dflags |= D_EXPANDTABS;
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break;
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case 'U':
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case 'u':
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diff_format = D_UNIFIED;
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if (optarg != NULL) {
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l = strtol(optarg, &ep, 10);
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if (*ep != '\0' || l < 0 || l >= INT_MAX)
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usage();
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diff_context = (int)l;
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} else
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diff_context = 3;
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break;
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case 'w':
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dflags |= D_IGNOREBLANKS;
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break;
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case 'X':
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read_excludes_file(optarg);
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break;
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case 'x':
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push_excludes(optarg);
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break;
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default:
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usage();
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break;
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}
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lastch = ch;
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newarg = optind != prevoptind;
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prevoptind = optind;
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}
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argc -= optind;
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argv += optind;
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/*
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* Do sanity checks, fill in stb1 and stb2 and call the appropriate
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* driver routine. Both drivers use the contents of stb1 and stb2.
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*/
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if (argc != 2)
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usage();
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if (ignore_pats != NULL) {
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char buf[BUFSIZ];
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int error;
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if ((error = regcomp(&ignore_re, ignore_pats,
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REG_NEWLINE | REG_EXTENDED)) != 0) {
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regerror(error, &ignore_re, buf, sizeof(buf));
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if (*ignore_pats != '\0')
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errx(2, "%s: %s", ignore_pats, buf);
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else
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errx(2, "%s", buf);
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}
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}
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if (strcmp(argv[0], "-") == 0) {
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fstat(STDIN_FILENO, &stb1);
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gotstdin = 1;
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} else if (stat(argv[0], &stb1) != 0)
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err(2, "%s", argv[0]);
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if (strcmp(argv[1], "-") == 0) {
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fstat(STDIN_FILENO, &stb2);
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gotstdin = 1;
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} else if (stat(argv[1], &stb2) != 0)
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err(2, "%s", argv[1]);
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if (gotstdin && (S_ISDIR(stb1.st_mode) || S_ISDIR(stb2.st_mode)))
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errx(2, "can't compare - to a directory");
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set_argstr(oargv, argv);
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if (S_ISDIR(stb1.st_mode) && S_ISDIR(stb2.st_mode)) {
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if (diff_format == D_IFDEF)
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errx(2, "-D option not supported with directories");
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diffdir(argv[0], argv[1], dflags);
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} else {
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if (S_ISDIR(stb1.st_mode)) {
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argv[0] = splice(argv[0], argv[1]);
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if (stat(argv[0], &stb1) < 0)
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err(2, "%s", argv[0]);
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}
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if (S_ISDIR(stb2.st_mode)) {
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argv[1] = splice(argv[1], argv[0]);
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if (stat(argv[1], &stb2) < 0)
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err(2, "%s", argv[1]);
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}
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print_status(diffreg(argv[0], argv[1], dflags), argv[0], argv[1],
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NULL);
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}
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exit(status);
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}
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void
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set_argstr(char **av, char **ave)
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{
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size_t argsize;
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char **ap;
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argsize = 4 + *ave - *av + 1;
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diffargs = xmalloc(argsize);
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strlcpy(diffargs, "diff", argsize);
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for (ap = av + 1; ap < ave; ap++) {
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if (strcmp(*ap, "--") != 0) {
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strlcat(diffargs, " ", argsize);
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strlcat(diffargs, *ap, argsize);
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}
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}
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}
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/*
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* Read in an excludes file and push each line.
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*/
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void
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read_excludes_file(char *file)
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{
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FILE *fp;
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char *buf, *pattern;
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size_t len;
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if (strcmp(file, "-") == 0)
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fp = stdin;
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else if ((fp = fopen(file, "r")) == NULL)
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err(2, "%s", file);
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while ((buf = fgetln(fp, &len)) != NULL) {
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if (buf[len - 1] == '\n')
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len--;
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pattern = xmalloc(len + 1);
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memcpy(pattern, buf, len);
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pattern[len] = '\0';
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push_excludes(pattern);
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}
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if (strcmp(file, "-") != 0)
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fclose(fp);
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}
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/*
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* Push a pattern onto the excludes list.
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*/
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void
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push_excludes(char *pattern)
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{
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struct excludes *entry;
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entry = xmalloc(sizeof(*entry));
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entry->pattern = pattern;
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entry->next = excludes_list;
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excludes_list = entry;
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}
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void
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push_ignore_pats(char *pattern)
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{
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size_t len;
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if (ignore_pats == NULL)
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ignore_pats = xstrdup(pattern);
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else {
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/* old + "|" + new + NUL */
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len = strlen(ignore_pats) + strlen(pattern) + 2;
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ignore_pats = xrealloc(ignore_pats, 1, len);
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strlcat(ignore_pats, "|", len);
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strlcat(ignore_pats, pattern, len);
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}
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}
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void
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print_only(const char *path, size_t dirlen, const char *entry)
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{
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if (dirlen > 1)
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dirlen--;
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printf("Only in %.*s: %s\n", (int)dirlen, path, entry);
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}
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void
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print_status(int val, char *path1, char *path2, char *entry)
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{
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switch (val) {
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case D_ONLY:
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print_only(path1, strlen(path1), entry);
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break;
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case D_COMMON:
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printf("Common subdirectories: %s%s and %s%s\n",
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path1, entry ? entry : "", path2, entry ? entry : "");
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break;
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case D_BINARY:
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printf("Binary files %s%s and %s%s differ\n",
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path1, entry ? entry : "", path2, entry ? entry : "");
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break;
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case D_DIFFER:
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if (diff_format == D_BRIEF)
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printf("Files %s%s and %s%s differ\n",
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path1, entry ? entry : "",
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path2, entry ? entry : "");
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break;
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case D_SAME:
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if (sflag)
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printf("Files %s%s and %s%s are identical\n",
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path1, entry ? entry : "",
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path2, entry ? entry : "");
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break;
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case D_MISMATCH1:
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printf("File %s%s is a directory while file %s%s is a regular file\n",
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path1, entry ? entry : "", path2, entry ? entry : "");
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break;
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case D_MISMATCH2:
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printf("File %s%s is a regular file while file %s%s is a directory\n",
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path1, entry ? entry : "", path2, entry ? entry : "");
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break;
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case D_SKIPPED1:
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printf("File %s%s is not a regular file or directory and was skipped\n",
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path1, entry ? entry : "");
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break;
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case D_SKIPPED2:
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printf("File %s%s is not a regular file or directory and was skipped\n",
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path2, entry ? entry : "");
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break;
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}
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}
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__dead void
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usage(void)
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{
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(void)fprintf(stderr,
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"usage: diff [-abdilpTtw] [-c | -e | -f | -n | -q | -u] [-I pattern] [-L label]\n"
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" file1 file2\n"
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" diff [-abdilpTtw] [-I pattern] [-L label] -C number file1 file2\n"
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" diff [-abdiltw] [-I pattern] -D string file1 file2\n"
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" diff [-abdilpTtw] [-I pattern] [-L label] -U number file1 file2\n"
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" diff [-abdilNPprsTtw] [-c | -e | -f | -n | -q | -u] [-I pattern]\n"
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" [-L label] [-S name] [-X file] [-x pattern] dir1 dir2\n");
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exit(2);
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}
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