mirror of
https://github.com/sheumann/hush.git
synced 2024-08-20 04:28:57 +00:00
153 lines
4.2 KiB
C
153 lines
4.2 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* Mini cmp implementation for busybox
|
|
*
|
|
* Copyright (C) 2000,2001 by Matt Kraai <kraai@alumni.carnegiemellon.edu>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*
|
|
*/
|
|
|
|
/* BB_AUDIT SUSv3 (virtually) compliant -- uses nicer GNU format for -l. */
|
|
/* http://www.opengroup.org/onlinepubs/007904975/utilities/cmp.html */
|
|
|
|
/* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
|
|
*
|
|
* Original version majorly reworked for SUSv3 compliance, bug fixes, and
|
|
* size optimizations. Changes include:
|
|
* 1) Now correctly distingusishes between errors and actual file differences.
|
|
* 2) Proper handling of '-' args.
|
|
* 3) Actual error checking of i/o.
|
|
* 4) Accept SUSv3 -l option. Note that we use the slightly nicer gnu format
|
|
* in the '-l' case.
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include "busybox.h"
|
|
|
|
static FILE *cmp_xfopen_input(const char *filename)
|
|
{
|
|
FILE *fp;
|
|
|
|
if ((fp = bb_wfopen_input(filename)) != NULL) {
|
|
return fp;
|
|
}
|
|
|
|
exit(bb_default_error_retval); /* We already output an error message. */
|
|
}
|
|
|
|
static const char fmt_eof[] = "cmp: EOF on %s\n";
|
|
static const char fmt_differ[] = "%s %s differ: char %d, line %d\n";
|
|
#if 0
|
|
static const char fmt_l_opt[] = "%.0s%.0s%d %o %o\n"; /* SUSv3 format */
|
|
#else
|
|
static const char fmt_l_opt[] = "%.0s%.0s%d %3o %3o\n"; /* nicer gnu format */
|
|
#endif
|
|
|
|
static const char opt_chars[] = "sl";
|
|
|
|
enum {
|
|
OPT_s = 1,
|
|
OPT_l = 2
|
|
};
|
|
|
|
int cmp_main(int argc, char **argv)
|
|
{
|
|
FILE *fp1, *fp2, *outfile = stdout;
|
|
const char *filename1, *filename2;
|
|
const char *fmt;
|
|
int c1, c2, char_pos, line_pos;
|
|
int opt_flags;
|
|
int exit_val = 0;
|
|
|
|
bb_default_error_retval = 2; /* 1 is returned if files are different. */
|
|
|
|
opt_flags = bb_getopt_ulflags(argc, argv, opt_chars);
|
|
|
|
if ((opt_flags == 3) || (((unsigned int)(--argc - optind)) > 1)) {
|
|
bb_show_usage();
|
|
}
|
|
|
|
fp1 = cmp_xfopen_input(filename1 = *(argv += optind));
|
|
|
|
filename2 = "-";
|
|
if (*++argv) {
|
|
filename2 = *argv;
|
|
}
|
|
fp2 = cmp_xfopen_input(filename2);
|
|
|
|
if (fp1 == fp2) { /* Paranioa check... stdin == stdin? */
|
|
/* Note that we don't bother reading stdin. Neither does gnu wc.
|
|
* But perhaps we should, so that other apps down the chain don't
|
|
* get the input. Consider 'echo hello | (cmp - - && cat -)'.
|
|
*/
|
|
return 0;
|
|
}
|
|
|
|
fmt = fmt_differ;
|
|
if (opt_flags == OPT_l) {
|
|
fmt = fmt_l_opt;
|
|
}
|
|
|
|
char_pos = 0;
|
|
line_pos = 1;
|
|
do {
|
|
c1 = getc(fp1);
|
|
c2 = getc(fp2);
|
|
++char_pos;
|
|
if (c1 != c2) { /* Remember -- a read error may have occurred. */
|
|
exit_val = 1; /* But assume the files are different for now. */
|
|
if (c2 == EOF) {
|
|
/* We know that fp1 isn't at EOF or in an error state. But to
|
|
* save space below, things are setup to expect an EOF in fp1
|
|
* if an EOF occurred. So, swap things around.
|
|
*/
|
|
fp1 = fp2;
|
|
filename1 = filename2;
|
|
c1 = c2;
|
|
}
|
|
if (c1 == EOF) {
|
|
bb_xferror(fp1, filename1);
|
|
fmt = fmt_eof; /* Well, no error, so it must really be EOF. */
|
|
outfile = stderr;
|
|
/* There may have been output to stdout (option -l), so
|
|
* make sure we fflush before writing to stderr. */
|
|
bb_xfflush_stdout();
|
|
}
|
|
if (opt_flags != OPT_s) {
|
|
if (opt_flags == OPT_l) {
|
|
line_pos = c1; /* line_pos is unused in the -l case. */
|
|
}
|
|
bb_fprintf(outfile, fmt, filename1, filename2, char_pos, line_pos, c2);
|
|
if (opt_flags) { /* This must be -l since not -s. */
|
|
/* If we encountered and EOF, the while check will catch it. */
|
|
continue;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
if (c1 == '\n') {
|
|
++line_pos;
|
|
}
|
|
} while (c1 != EOF);
|
|
|
|
bb_xferror(fp1, filename1);
|
|
bb_xferror(fp2, filename2);
|
|
|
|
bb_fflush_stdout_and_exit(exit_val);
|
|
}
|