/* vi: set sw=4 ts=4: * * touch.c - Modify a file's timestamps. * * Copyright (C) 2007 Charlie Shepherd <masterdriverz@gentoo.org> * * See http://www.opengroup.org/onlinepubs/009695399/utilities/touch.html USE_TOUCH(NEWTOY(touch, "l#t:r:mca", TOYFLAG_BIN|TOYFLAG_UMASK)) config TOUCH bool "touch" default y help usage: touch [-acm] [-r FILE] [-t MMDDhhmm] [-l bytes] FILE... Change file timestamps, ensure file existance and change file length. -a Only change the access time. -c Do not create the file if it doesn't exist. -l Length to truncate (or sparsely extend) file to. -m Only change the modification time. -r Reference file to take timestamps from. -t Time to change {a,m}time to. */ #include "toys.h" DEFINE_GLOBALS( char *ref_file; char *time; long length; ) #define TT this.touch #define OPT_MTIME 0x01 #define OPT_NOCREATE 0x02 #define OPT_ATIME 0x04 #define OPT_REFERENCE 0x08 #define OPT_TIME 0x10 #define OPT_LENGTH 0x20 void touch_main(void) { char *arg; int i, set_a, set_m; time_t curr_a, curr_m; set_a = !!(toys.optflags & OPT_ATIME); set_m = !!(toys.optflags & OPT_MTIME); // Use timestamp on a file if (toys.optflags & OPT_REFERENCE) { struct stat sb; if (toys.optflags & OPT_TIME) error_exit("Redundant time source"); xstat(TT.ref_file, &sb); curr_m = sb.st_mtime; curr_a = sb.st_atime; // Use time specified on command line. } else if (toys.optflags & OPT_TIME) { struct tm t; time_t curr; char *c; curr = time(NULL); if (localtime_r(&curr, &t) || !(c = strptime(TT.time, "%m%d%H%M", &t)) || *c || -1==(curr_a = curr_m = mktime(&t))) { error_exit("Unknown time %s", TT.time); } // use current time } else curr_m = curr_a = time(NULL); for (i = 0; (arg = toys.optargs[i]); i++) { struct utimbuf buf; struct stat sb; buf.modtime = curr_m; buf.actime = curr_a; if (stat(arg, &sb)) { if (!(toys.optflags & OPT_NOCREATE)) { xcreate(arg, O_CREAT, 0644); if (stat(arg, &sb)) goto error; } } if ((set_a+set_m) == 1) { /* We've been asked to only change one */ if (set_a) buf.modtime = sb.st_mtime; else if (set_m) buf.actime = sb.st_atime; } if (toys.optflags & OPT_LENGTH) if (truncate(arg, TT.length)) goto error; if (utime(arg, &buf)) error: perror_exit(arg); } }