| /* vi: set sw=4 ts=4: */ |
| /* |
| * Mini touch implementation for busybox |
| * |
| * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org> |
| * |
| * 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" |
| //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: This requires libc support for lutimes() function. |
| //config: |
| //config:config FEATURE_TOUCH_SUSV3 |
| //config: bool "Add support for SUSV3 features (-d -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-$(CONFIG_TOUCH) += touch.o |
| |
| /* BB_AUDIT SUSv3 _NOT_ compliant -- options -a, -m not supported. */ |
| /* http://www.opengroup.org/onlinepubs/007904975/utilities/touch.html */ |
| |
| //usage:#define touch_trivial_usage |
| //usage: "[-c]" IF_FEATURE_TOUCH_SUSV3(" [-d DATE] [-t DATE] [-r FILE]") " FILE..." |
| //usage:#define touch_full_usage "\n\n" |
| //usage: "Update the last-modified date on the given FILE[s]\n" |
| //usage: "\n -c Don't create files" |
| //usage: IF_FEATURE_TOUCH_NODEREF( |
| //usage: "\n -h Don't follow links" |
| //usage: ) |
| //usage: IF_FEATURE_TOUCH_SUSV3( |
| //usage: "\n -d DT Date/time to use" |
| //usage: "\n -t DT Date/time to use" |
| //usage: "\n -r FILE Use FILE's date/time" |
| //usage: ) |
| //usage: |
| //usage:#define touch_example_usage |
| //usage: "$ 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 status = EXIT_SUCCESS; |
| int opts; |
| enum { |
| OPT_c = (1 << 0), |
| OPT_r = (1 << 1) * ENABLE_FEATURE_TOUCH_SUSV3, |
| OPT_d = (1 << 2) * ENABLE_FEATURE_TOUCH_SUSV3, |
| OPT_t = (1 << 3) * ENABLE_FEATURE_TOUCH_SUSV3, |
| OPT_h = (1 << 4) * ENABLE_FEATURE_TOUCH_NODEREF, |
| }; |
| #if ENABLE_FEATURE_TOUCH_SUSV3 |
| # if ENABLE_LONG_OPTS |
| static const char touch_longopts[] ALIGN1 = |
| /* name, has_arg, val */ |
| "no-create\0" No_argument "c" |
| "reference\0" Required_argument "r" |
| "date\0" Required_argument "d" |
| IF_FEATURE_TOUCH_NODEREF("no-dereference\0" No_argument "h") |
| ; |
| # endif |
| char *reference_file = NULL; |
| char *date_str = NULL; |
| struct timeval timebuf[2]; |
| timebuf[1].tv_usec = timebuf[0].tv_usec = 0; |
| #else |
| # define reference_file NULL |
| # define date_str NULL |
| # define timebuf ((struct timeval*)NULL) |
| #endif |
| |
| #if ENABLE_FEATURE_TOUCH_SUSV3 && ENABLE_LONG_OPTS |
| applet_long_options = touch_longopts; |
| #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 = getopt32(argv, "c" IF_FEATURE_TOUCH_SUSV3("r:d:t:") |
| IF_FEATURE_TOUCH_NODEREF("h") |
| /*ignored:*/ "fma" |
| IF_FEATURE_TOUCH_SUSV3(, &reference_file) |
| IF_FEATURE_TOUCH_SUSV3(, &date_str) |
| IF_FEATURE_TOUCH_SUSV3(, &date_str) |
| ); |
| |
| argv += optind; |
| if (!*argv) { |
| bb_show_usage(); |
| } |
| |
| if (reference_file) { |
| struct stat stbuf; |
| xstat(reference_file, &stbuf); |
| timebuf[1].tv_sec = timebuf[0].tv_sec = stbuf.st_mtime; |
| /* Can use .st_mtim.tv_nsec |
| * (or is it .st_mtimensec?? see date.c) |
| * to set microseconds too. |
| */ |
| } |
| |
| if (date_str) { |
| 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; |
| } |
| |
| do { |
| int result; |
| result = ( |
| #if ENABLE_FEATURE_TOUCH_NODEREF |
| (opts & OPT_h) ? lutimes : |
| #endif |
| utimes)(*argv, (reference_file || date_str) ? timebuf : NULL); |
| 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) { |
| xclose(fd); |
| if (reference_file || date_str) |
| utimes(*argv, timebuf); |
| continue; |
| } |
| } |
| status = EXIT_FAILURE; |
| bb_simple_perror_msg(*argv); |
| } |
| } while (*++argv); |
| |
| return status; |
| } |