/* vi: set sw=4 ts=4: */ /* * Mini touch implementation for busybox * * Copyright (C) 1999-2004 by Erik Andersen * * Licensed under GPLv2 or later, see file LICENSE in this source tree. */ /* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org) * * Previous version called open() and then utime(). While this will be * be necessary to implement -r and -t, it currently only makes things bigger. * Also, exiting on a failure was a bug. All args should be processed. */ //config:config TOUCH //config: bool "touch (5.9 kb)" //config: default y //config: help //config: touch is used to create or change the access and/or //config: modification timestamp of specified files. //config: //config:config FEATURE_TOUCH_NODEREF //config: bool "Add support for -h" //config: default y //config: depends on TOUCH //config: help //config: Enable touch to have the -h option. //config: //config:config FEATURE_TOUCH_SUSV3 //config: bool "Add support for SUSV3 features (-a -d -m -t -r)" //config: default y //config: depends on TOUCH //config: help //config: Enable touch to use a reference file or a given date/time argument. //applet:IF_TOUCH(APPLET_NOFORK(touch, touch, BB_DIR_BIN, BB_SUID_DROP, touch)) //kbuild:lib-$(CONFIG_TOUCH) += touch.o //usage:#define touch_trivial_usage //usage: "[-c" IF_FEATURE_TOUCH_SUSV3("am") "]" //usage: IF_FEATURE_TOUCH_SUSV3(" [-d DATE] [-t DATE] [-r FILE]") //usage: " FILE..." //usage:#define touch_full_usage "\n\n" //usage: "Update the last-modified date on the given FILE[s]\n" //usage: "\n -c Don't create files" //usage: IF_FEATURE_TOUCH_NODEREF( //usage: "\n -h Don't follow links" //usage: ) //usage: IF_FEATURE_TOUCH_SUSV3( //usage: "\n -a Change only atime" //usage: "\n -m Change only mtime" //usage: "\n -d DT Date/time to use" //usage: "\n -t DT Date/time to use" //usage: "\n -r FILE Use FILE's date/time" //usage: ) //usage: //usage:#define touch_example_usage //usage: "$ ls -l /tmp/foo\n" //usage: "/bin/ls: /tmp/foo: No such file or directory\n" //usage: "$ touch /tmp/foo\n" //usage: "$ ls -l /tmp/foo\n" //usage: "-rw-rw-r-- 1 andersen andersen 0 Apr 15 01:11 /tmp/foo\n" /* coreutils implements: * -a change only the access time * -c, --no-create * do not create any files * -d, --date=STRING * parse STRING and use it instead of current time * -f (ignored, BSD compat) * -m change only the modification time * -h, --no-dereference * -r, --reference=FILE * use this file's times instead of current time * -t STAMP * use [[CC]YY]MMDDhhmm[.ss] instead of current time * --time=WORD * change the specified time: WORD is access, atime, or use */ #include "libbb.h" int touch_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; int touch_main(int argc UNUSED_PARAM, char **argv) { int fd; int opts; smalluint status = EXIT_SUCCESS; #if ENABLE_FEATURE_TOUCH_SUSV3 char *reference_file; char *date_str; /* timebuf[0] is atime, timebuf[1] is mtime */ struct timespec timebuf[2]; #else # define reference_file NULL # define date_str NULL # define timebuf ((struct timespec*)NULL) #endif enum { OPT_c = (1 << 0), OPT_h = (1 << 1) * ENABLE_FEATURE_TOUCH_NODEREF, OPT_r = (1 << (1+ENABLE_FEATURE_TOUCH_NODEREF)) * ENABLE_FEATURE_TOUCH_SUSV3, OPT_d = (1 << (2+ENABLE_FEATURE_TOUCH_NODEREF)) * ENABLE_FEATURE_TOUCH_SUSV3, OPT_t = (1 << (3+ENABLE_FEATURE_TOUCH_NODEREF)) * ENABLE_FEATURE_TOUCH_SUSV3, OPT_a = (1 << (4+ENABLE_FEATURE_TOUCH_NODEREF)) * ENABLE_FEATURE_TOUCH_SUSV3, OPT_m = (1 << (5+ENABLE_FEATURE_TOUCH_NODEREF)) * ENABLE_FEATURE_TOUCH_SUSV3, }; #if ENABLE_LONG_OPTS static const char touch_longopts[] ALIGN1 = /* name, has_arg, val */ "no-create\0" No_argument "c" IF_FEATURE_TOUCH_SUSV3("reference\0" Required_argument "r") IF_FEATURE_TOUCH_SUSV3("date\0" Required_argument "d") IF_FEATURE_TOUCH_NODEREF("no-dereference\0" No_argument "h") ; #endif /* -d and -t both set time. In coreutils, * accepted data format differs a bit between -d and -t. * We accept the same formats for both */ opts = getopt32long(argv, "^" "c" IF_FEATURE_TOUCH_NODEREF("h") IF_FEATURE_TOUCH_SUSV3("r:d:t:am") /*ignored:*/ "f" IF_NOT_FEATURE_TOUCH_SUSV3("am") "\0" /* opt_complementary: */ /* at least one arg: */ "-1" /* coreutils forbids -r and -t at once: */ IF_FEATURE_TOUCH_SUSV3(":r--t:t--r") /* but allows these combinations: "r--d:d--r:t--d:d--t" */ , touch_longopts #if ENABLE_FEATURE_TOUCH_SUSV3 , &reference_file , &date_str , &date_str #endif ); timebuf[0].tv_nsec = timebuf[1].tv_nsec = UTIME_NOW; if (opts & OPT_r) { struct stat stbuf; xstat(reference_file, &stbuf); timebuf[0].tv_sec = stbuf.st_atime; timebuf[1].tv_sec = stbuf.st_mtime; timebuf[0].tv_nsec = stbuf.st_atim.tv_nsec; timebuf[1].tv_nsec = stbuf.st_mtim.tv_nsec; } if (opts & (OPT_d|OPT_t)) { struct tm tm_time; time_t t; //memset(&tm_time, 0, sizeof(tm_time)); /* Better than memset: makes "HH:MM" dates meaningful */ time(&t); localtime_r(&t, &tm_time); parse_datestr(date_str, &tm_time); /* Correct any day of week and day of year etc. fields */ tm_time.tm_isdst = -1; /* Be sure to recheck dst */ t = validate_tm_time(date_str, &tm_time); timebuf[1].tv_sec = timebuf[0].tv_sec = t; timebuf[1].tv_nsec = timebuf[0].tv_nsec = 0; } if (opts & OPT_a) { timebuf[1].tv_nsec = UTIME_OMIT; } if (opts & OPT_m) { timebuf[0].tv_nsec = UTIME_OMIT; } argv += optind; do { int result = utimensat(AT_FDCWD, *argv, timebuf, (opts & OPT_h) ? AT_SYMLINK_NOFOLLOW : 0); if (result != 0) { if (errno == ENOENT) { /* no such file? */ if (opts & OPT_c) { /* Creation is disabled, so ignore */ continue; } /* Try to create the file */ fd = open(*argv, O_RDWR | O_CREAT, 0666); if (fd >= 0) { if (reference_file || date_str) futimens(fd, timebuf); xclose(fd); continue; } } status = EXIT_FAILURE; bb_simple_perror_msg(*argv); } } while (*++argv); return status; }