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/* $Id: newer.c,v 1.10 2005/11/30 08:49:55 taco Exp $
* newer - true if any source file is newer than the target file.
*
* Public domain.
*
* This program used to be Copyright 1990 - 1995 by AT&T Bell Laboratories,
* and the original version was written by John Hobby. It has since been
* placed in the public domain.
*/
#ifdef HAVE_CONFIG_H
#include "c-auto.h" /* In case we need, e.g., _POSIX_SOURCE */
#include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#if !defined(WIN32) || defined(__MINGW32__)
#include <sys/types.h>
#include <sys/stat.h>
#endif
/* Exit codes are 0 for success ("true") and 1 for failure ("false"). */
#define exit_false 1
#define exit_true 0
/* We may have high-res timers in struct stat. If we do, use them. */
#if HAVE_ST_MTIM
#define NEWER(S,T) (S.st_mtim.tv_sec > T.st_mtim.tv_sec || \
(S.st_mtim.tv_sec == T.st_mtim.tv_sec && \
S.st_mtim.tv_nsec >= T.st_mtim.tv_nsec))
#else
#define NEWER(S,T) (S.st_mtime >= T.st_mtime)
#endif
int i;
int verbose = 0;
int quiet = 0;
int missing_source = 0;
int missing_target = 0;
int result = exit_false;
/*
* newer src1 [ src2 ... srcN ] target
*
* returns 0 if files `src1' ... `srcN' exist and
* at least one of them is not older than `target'
* or if `target' doesn't exist.
*/
int
main(int argc, char **argv)
{
struct stat source_stat, target_stat;
while ((argc > 1) && (argv[1][0] == '-')) {
if (strcmp(argv[1], "-v") == 0 ||
strcmp(argv[1], "-verbose") == 0 ||
strcmp(argv[1], "--verbose") == 0) {
verbose = 1;
argv++;
argc--;
} else if (strcmp(argv[1], "-q") == 0 ||
strcmp(argv[1], "-quiet") == 0 ||
strcmp(argv[1], "--quiet") == 0) {
quiet = 1;
argv++;
argc--;
} else if (strcmp(argv[1], "-help") == 0 ||
strcmp(argv[1], "--help") == 0) {
fputs("Usage: newer [OPTION] src1 [ src2 ... srcN ] target\n\
Exit successfully if `src1' ... `srcN' exist and at least\n\
one of them is not older than `target'.\n\
Also exit successfully if `target' doesn't exist.\n\
\n\
--help Display this help and exit\n\
--quiet Do not print anything\n\
--verbose List missing files, including missing target files\n\
--version Output version information and exit\n\n", stdout);
fputs("Email bug reports to metapost@tug.org.\n", stdout);
exit(0);
} else if (strcmp(argv[1], "-version") == 0 ||
strcmp(argv[1], "--version") == 0) {
fputs("newer 0.992\n\
This program is in the public domain.\n\
Primary author of newer: John Hobby.\n\
Current maintainer: Taco Hoekwater.\n", stdout);
exit(0);
} else {
fprintf(stderr, "newer: Unknown option \"%s\"\n", argv[1]);
fputs("Try `newer --help' for more information.\n", stderr);
exit(1);
}
}
/* do we have at least two arguments? */
if (argc < 3) {
fputs("newer: Too few arguments.\n\
Try `newer --help' for more information.\n", stderr);
exit(1);
}
/* check the target file */
if (stat(argv[argc - 1], &target_stat) < 0) {
if (verbose && !quiet) {
fprintf(stderr, "newer: target file `%s' doesn't exist.\n",
argv[argc - 1]);
}
missing_target = 1;
}
/* check the source files */
for (i = 1; i < (argc - 1); i++) {
if (stat(argv[i], &source_stat) < 0) {
if (!quiet) {
fprintf(stderr, "newer: source file `%s' doesn't exist.\n",
argv[i]);
}
missing_source = 1;
} else if (!missing_target) {
if (NEWER(source_stat, target_stat)) {
result = exit_true;
}
}
}
/* Adjust result for cases when source or target is missing:
* missing source => exit_false
* missing target => exit_true
*/
if (missing_source) {
result = exit_false;
} else if (missing_target) {
result = exit_true;
}
return result;
}
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