/* * Copyright (c) 1993 * The Regents of the University of California. All rights reserved. * * %sccs.include.redist.c% */ #ifndef lint static char copyright[] = "@(#) Copyright (c) 1993\n\ The Regents of the University of California. All rights reserved.\n"; #endif /* not lint */ #ifndef lint static char sccsid[] = "@(#)touch.c 8.1 (Berkeley) 06/06/93"; #endif /* not lint */ #include #include #include #include #include #include #include #include #include #include #include int rw __P((char *, struct stat *, int)); void stime_arg1 __P((char *, struct timeval *)); void stime_arg2 __P((char *, int, struct timeval *)); void stime_file __P((char *, struct timeval *)); void usage __P((void)); int main(argc, argv) int argc; char *argv[]; { struct stat sb; struct timeval tv[2]; int aflag, cflag, fflag, mflag, ch, fd, len, rval, timeset; char *p; aflag = cflag = fflag = mflag = timeset = 0; if (gettimeofday(&tv[0], NULL)) err(1, "gettimeofday"); while ((ch = getopt(argc, argv, "acfmr:t:")) != EOF) switch(ch) { case 'a': aflag = 1; break; case 'c': cflag = 1; break; case 'f': fflag = 1; break; case 'm': mflag = 1; break; case 'r': timeset = 1; stime_file(optarg, tv); break; case 't': timeset = 1; stime_arg1(optarg, tv); break; case '?': default: usage(); } argc -= optind; argv += optind; /* Default is both -a and -m. */ if (aflag == 0 && mflag == 0) aflag = mflag = 1; /* * If no -r or -t flag, at least two operands, the first of which * is an 8 or 10 digit number, use the obsolete time specification. */ if (!timeset && argc > 1) { (void)strtol(argv[0], &p, 10); len = p - argv[0]; if (*p == '\0' && (len == 8 || len == 10)) { timeset = 1; stime_arg2(*argv++, len == 10, tv); } } /* Otherwise use the current time of day. */ if (!timeset) tv[1] = tv[0]; if (*argv == NULL) usage(); for (rval = 0; *argv; ++argv) { /* See if the file exists. */ if (stat(*argv, &sb)) if (!cflag) { /* Create the file. */ fd = open(*argv, O_WRONLY | O_CREAT, DEFFILEMODE); if (fd == -1 || fstat(fd, &sb) || close(fd)) { rval = 1; warn("%s", *argv); continue; } /* If using the current time, we're done. */ if (!timeset) continue; } else continue; if (!aflag) TIMESPEC_TO_TIMEVAL(&tv[0], &sb.st_atimespec); if (!mflag) TIMESPEC_TO_TIMEVAL(&tv[1], &sb.st_mtimespec); /* Try utimes(2). */ if (!utimes(*argv, tv)) continue; /* If the user specified a time, nothing else we can do. */ if (timeset) { rval = 1; warn("%s", *argv); } /* * System V and POSIX 1003.1 require that a NULL argument * set the access/modification times to the current time. * The permission checks are different, too, in that the * ability to write the file is sufficient. Take a shot. */ if (!utimes(*argv, NULL)) continue; /* Try reading/writing. */ if (rw(*argv, &sb, fflag)) rval = 1; } exit(rval); } #define ATOI2(ar) ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2; void stime_arg1(arg, tvp) char *arg; struct timeval *tvp; { struct tm *t; int yearset; char *p; /* Start with the current time. */ if ((t = localtime(&tvp[0].tv_sec)) == NULL) err(1, "localtime"); /* [[CC]YY]MMDDhhmm[.SS] */ if ((p = strchr(arg, '.')) == NULL) t->tm_sec = 0; /* Seconds defaults to 0. */ else { if (strlen(p + 1) != 2) goto terr; *p++ = '\0'; t->tm_sec = ATOI2(p); } yearset = 0; switch(strlen(arg)) { case 12: /* CCYYMMDDhhmm */ t->tm_year = ATOI2(arg); t->tm_year *= 1000; yearset = 1; /* FALLTHOUGH */ case 10: /* YYMMDDhhmm */ if (yearset) { yearset = ATOI2(arg); t->tm_year += yearset; } else { yearset = ATOI2(arg); if (yearset < 69) t->tm_year = yearset + 2000; else t->tm_year = yearset + 1900; } t->tm_year -= 1900; /* Convert to UNIX time. */ /* FALLTHROUGH */ case 8: /* MMDDhhmm */ t->tm_mon = ATOI2(arg); --t->tm_mon; /* Convert from 01-12 to 00-11 */ t->tm_mday = ATOI2(arg); t->tm_hour = ATOI2(arg); t->tm_min = ATOI2(arg); break; default: goto terr; } t->tm_isdst = -1; /* Figure out DST. */ tvp[0].tv_sec = tvp[1].tv_sec = mktime(t); if (tvp[0].tv_sec == -1) terr: errx(1, "out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]"); tvp[0].tv_usec = tvp[1].tv_usec = 0; } void stime_arg2(arg, year, tvp) char *arg; int year; struct timeval *tvp; { struct tm *t; /* Start with the current time. */ if ((t = localtime(&tvp[0].tv_sec)) == NULL) err(1, "localtime"); t->tm_mon = ATOI2(arg); /* MMDDhhmm[yy] */ --t->tm_mon; /* Convert from 01-12 to 00-11 */ t->tm_mday = ATOI2(arg); t->tm_hour = ATOI2(arg); t->tm_min = ATOI2(arg); if (year) t->tm_year = ATOI2(arg); t->tm_isdst = -1; /* Figure out DST. */ tvp[0].tv_sec = tvp[1].tv_sec = mktime(t); if (tvp[0].tv_sec == -1) errx(1, "out of range or illegal time specification: MMDDhhmm[yy]"); tvp[0].tv_usec = tvp[1].tv_usec = 0; } void stime_file(fname, tvp) char *fname; struct timeval *tvp; { struct stat sb; if (stat(fname, &sb)) err(1, "%s", fname); TIMESPEC_TO_TIMEVAL(tvp, &sb.st_atimespec); TIMESPEC_TO_TIMEVAL(tvp + 1, &sb.st_mtimespec); } int rw(fname, sbp, force) char *fname; struct stat *sbp; int force; { int fd, needed_chmod, rval; u_char byte; /* Try regular files and directories. */ if (!S_ISREG(sbp->st_mode) && !S_ISDIR(sbp->st_mode)) { warnx("%s: %s", fname, strerror(EFTYPE)); return (1); } needed_chmod = rval = 0; if ((fd = open(fname, O_RDWR, 0)) == -1) { if (!force || chmod(fname, DEFFILEMODE)) goto err; if ((fd = open(fname, O_RDWR, 0)) == -1) goto err; needed_chmod = 1; } if (sbp->st_size != 0) { if (read(fd, &byte, sizeof(byte)) != sizeof(byte)) goto err; if (lseek(fd, (off_t)0, SEEK_SET) == -1) goto err; if (write(fd, &byte, sizeof(byte)) != sizeof(byte)) goto err; } else { if (write(fd, &byte, sizeof(byte)) != sizeof(byte)) { err: rval = 1; warn("%s", fname); } else if (ftruncate(fd, (off_t)0)) { rval = 1; warn("%s: file modified", fname); } } if (close(fd) && rval != 1) { rval = 1; warn("%s", fname); } if (needed_chmod && chmod(fname, sbp->st_mode) && rval != 1) { rval = 1; warn("%s: permissions modified", fname); } return (rval); } __dead void usage() { (void)fprintf(stderr, "usage: touch [-acfm] [-r file] [-t time] file ...\n"); exit(1); }