8131eea3dc
function old new delta buffer_fill_and_print 179 196 +17 fflush_all - 9 +9 spawn 87 92 +5 rtcwake_main 455 453 -2 ... alarm_intr 93 84 -9 readcmd 1072 1062 -10 bb_ask 345 333 -12 more_main 845 832 -13 flush_stdout_stderr 42 23 -19 xfflush_stdout 27 - -27 flush_stderr 30 - -30 ------------------------------------------------------------------------------ (add/remove: 1/2 grow/shrink: 2/50 up/down: 31/-397) Total: -366 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
136 lines
3.7 KiB
C
136 lines
3.7 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* Mini cmp implementation for busybox
|
|
*
|
|
* Copyright (C) 2000,2001 by Matt Kraai <kraai@alumni.carnegiemellon.edu>
|
|
*
|
|
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
|
|
*/
|
|
|
|
/* 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 distinguishes 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 "libbb.h"
|
|
|
|
static const char fmt_eof[] ALIGN1 = "cmp: EOF on %s\n";
|
|
static const char fmt_differ[] ALIGN1 = "%s %s differ: char %"OFF_FMT"d, line %d\n";
|
|
// This fmt_l_opt uses gnu-isms. SUSv3 would be "%.0s%.0s%"OFF_FMT"d %o %o\n"
|
|
static const char fmt_l_opt[] ALIGN1 = "%.0s%.0s%"OFF_FMT"d %3o %3o\n";
|
|
|
|
static const char opt_chars[] ALIGN1 = "sl";
|
|
#define CMP_OPT_s (1<<0)
|
|
#define CMP_OPT_l (1<<1)
|
|
|
|
int cmp_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
|
int cmp_main(int argc UNUSED_PARAM, char **argv)
|
|
{
|
|
FILE *fp1, *fp2, *outfile = stdout;
|
|
const char *filename1, *filename2 = "-";
|
|
IF_DESKTOP(off_t skip1 = 0, skip2 = 0;)
|
|
off_t char_pos = 0;
|
|
int line_pos = 1; /* Hopefully won't overflow... */
|
|
const char *fmt;
|
|
int c1, c2;
|
|
unsigned opt;
|
|
int retval = 0;
|
|
|
|
xfunc_error_retval = 2; /* 1 is returned if files are different. */
|
|
|
|
opt_complementary = "-1"
|
|
IF_DESKTOP(":?4")
|
|
IF_NOT_DESKTOP(":?2")
|
|
":l--s:s--l";
|
|
opt = getopt32(argv, opt_chars);
|
|
argv += optind;
|
|
|
|
filename1 = *argv;
|
|
fp1 = xfopen_stdin(filename1);
|
|
|
|
if (*++argv) {
|
|
filename2 = *argv;
|
|
#if ENABLE_DESKTOP
|
|
if (*++argv) {
|
|
skip1 = XATOOFF(*argv);
|
|
if (*++argv) {
|
|
skip2 = XATOOFF(*argv);
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
|
|
fp2 = xfopen_stdin(filename2);
|
|
if (fp1 == fp2) { /* Paranoia 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;
|
|
}
|
|
|
|
if (opt & CMP_OPT_l)
|
|
fmt = fmt_l_opt;
|
|
else
|
|
fmt = fmt_differ;
|
|
|
|
#if ENABLE_DESKTOP
|
|
while (skip1) { getc(fp1); skip1--; }
|
|
while (skip2) { getc(fp2); skip2--; }
|
|
#endif
|
|
do {
|
|
c1 = getc(fp1);
|
|
c2 = getc(fp2);
|
|
++char_pos;
|
|
if (c1 != c2) { /* Remember: a read error may have occurred. */
|
|
retval = 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) {
|
|
die_if_ferror(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. */
|
|
fflush_all();
|
|
}
|
|
if (!(opt & CMP_OPT_s)) {
|
|
if (opt & CMP_OPT_l) {
|
|
line_pos = c1; /* line_pos is unused in the -l case. */
|
|
}
|
|
fprintf(outfile, fmt, filename1, filename2, char_pos, line_pos, c2);
|
|
if (opt) { /* This must be -l since not -s. */
|
|
/* If we encountered an EOF,
|
|
* the while check will catch it. */
|
|
continue;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
if (c1 == '\n') {
|
|
++line_pos;
|
|
}
|
|
} while (c1 != EOF);
|
|
|
|
die_if_ferror(fp1, filename1);
|
|
die_if_ferror(fp2, filename2);
|
|
|
|
fflush_stdout_and_exit(retval);
|
|
}
|