88 lines
2.6 KiB
C
88 lines
2.6 KiB
C
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#include <stdio.h>
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#include <string.h>
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#include <sys/types.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <stdlib.h>
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#include <fcntl.h>
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static void usage(void)
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{
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fprintf(stderr, "touch: usage: touch [-alm] [-t time_t] <file>\n");
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exit(1);
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}
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int touch_main(int argc, char *argv[])
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{
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int i, fd, aflag = 0, mflag = 0, debug = 0, flags = 0;
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struct timespec specified_time, times[2];
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char *file = 0;
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specified_time.tv_nsec = UTIME_NOW;
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for (i = 1; i < argc; i++) {
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if (argv[i][0] == '-') {
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/* an option */
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const char *arg = argv[i]+1;
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while (arg[0]) {
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switch (arg[0]) {
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case 'a': aflag = 1; break;
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case 'm': mflag = 1; break;
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case 't':
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if ((i+1) >= argc)
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usage();
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specified_time.tv_sec = atol(argv[++i]);
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if (specified_time.tv_sec == 0) {
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fprintf(stderr, "touch: invalid time_t\n");
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exit(1);
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}
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specified_time.tv_nsec = 0;
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break;
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case 'l': flags |= AT_SYMLINK_NOFOLLOW; break;
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case 'd': debug = 1; break;
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default:
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usage();
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}
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arg++;
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}
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} else {
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/* not an option, and only accept one filename */
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if (i+1 != argc)
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usage();
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file = argv[i];
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}
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}
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if (! file) {
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fprintf(stderr, "touch: no file specified\n");
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exit(1);
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}
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if (access(file, F_OK))
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if ((fd=creat(file, 0666)) != -1)
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close(fd);
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if ((mflag == 0) && (aflag == 0))
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aflag = mflag = 1;
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if (aflag)
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times[0] = specified_time;
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else
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times[0].tv_nsec = UTIME_OMIT;
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if (mflag)
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times[1] = specified_time;
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else
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times[1].tv_nsec = UTIME_OMIT;
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if (debug) {
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fprintf(stderr, "file = %s\n", file);
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fprintf(stderr, "times[0].tv_sec = %ld, times[0].tv_nsec = %ld\n", times[0].tv_sec, times[0].tv_nsec);
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fprintf(stderr, "times[1].tv_sec = %ld, times[1].tv_nsec = %ld\n", times[1].tv_sec, times[1].tv_nsec);
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fprintf(stderr, "flags = 0x%8.8x\n", flags);
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}
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return utimensat(AT_FDCWD, file, times, flags);
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}
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