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touch: add SUSv3 options -a and -m

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Add missing -a and -m options to be fully SUSv3 compliant.

function                                             old     new   delta
touch_main                                           415     510     +95
packed_usage                                       33824   33865     +41
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/0 up/down: 136/0)             Total: 136 bytes

v2: Ignore -a/-m if not ENABLE_FEATURE_TOUCH_SUSV3.

Signed-off-by: Xabier Oneca <xoneca@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Xabier Oneca 2021-04-09 23:15:29 +02:00 committed by Denys Vlasenko
parent 7323bca1b0
commit 520bb3eac2
1 changed files with 45 additions and 14 deletions
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59
coreutils/touch.c
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@ -28,7 +28,7 @@
//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: bool "Add support for SUSV3 features (-a -d -m -t -r)"
//config: default y
//config: depends on TOUCH
//config: help
@ -38,11 +38,10 @@
//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: "[-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"
@ -50,6 +49,8 @@
//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"
@ -92,9 +93,13 @@ int touch_main(int argc UNUSED_PARAM, char **argv)
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,
OPT_a = (1 << 4) * ENABLE_FEATURE_TOUCH_SUSV3,
OPT_m = (1 << 5) * ENABLE_FEATURE_TOUCH_SUSV3,
OPT_h = (1 << 6) * ENABLE_FEATURE_TOUCH_NODEREF,
};
#if ENABLE_FEATURE_TOUCH_SUSV3
/* NULL = use current time */
const struct timeval *newtime = NULL;
# if ENABLE_LONG_OPTS
static const char touch_longopts[] ALIGN1 =
/* name, has_arg, val */
@ -111,6 +116,7 @@ int touch_main(int argc UNUSED_PARAM, char **argv)
# endif
char *reference_file = NULL;
char *date_str = NULL;
/* timebuf[0] is atime, timebuf[1] is mtime */
struct timeval timebuf[2];
timebuf[1].tv_usec = timebuf[0].tv_usec = 0;
#else
@ -124,9 +130,9 @@ int touch_main(int argc UNUSED_PARAM, char **argv)
/* -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:")
opts = GETOPT32(argv, "c" IF_FEATURE_TOUCH_SUSV3("r:d:t:am")
IF_FEATURE_TOUCH_NODEREF("h")
/*ignored:*/ "fma"
/*ignored:*/ "f" IF_NOT_FEATURE_TOUCH_SUSV3("am")
LONGOPTS
IF_FEATURE_TOUCH_SUSV3(, &reference_file)
IF_FEATURE_TOUCH_SUSV3(, &date_str)
@ -146,6 +152,7 @@ int touch_main(int argc UNUSED_PARAM, char **argv)
* (or is it .st_mtimensec?? see date.c)
* to set microseconds too.
*/
newtime = timebuf;
}
if (date_str) {
@ -163,15 +170,39 @@ int touch_main(int argc UNUSED_PARAM, char **argv)
t = validate_tm_time(date_str, &tm_time);
timebuf[1].tv_sec = timebuf[0].tv_sec = t;
newtime = timebuf;
}
if ((opts & (OPT_a | OPT_m)) && !newtime) {
time(&timebuf[0].tv_sec);
timebuf[1].tv_sec = timebuf[0].tv_sec;
newtime = timebuf;
}
do {
int result;
result = (
#if ENABLE_FEATURE_TOUCH_NODEREF
(opts & OPT_h) ? lutimes :
#endif
utimes)(*argv, (reference_file || date_str) ? timebuf : NULL);
if (opts & (OPT_a | OPT_m)) {
/* Save original times */
struct stat stbuf;
if (stat(*argv, &stbuf) == 0) {
/* As we must set both times, we lose original
* file time microseconds.
* Can use .st_mtim.tv_nsec
* (or is it .st_mtimensec?? see date.c)
* to set microseconds too.
* Also, utimensat(2) allows to omit one of the
* times to be set. But it is SUSv4.
*/
if (!(opts & OPT_a))
timebuf[0].tv_sec = stbuf.st_atime;
if (!(opts & OPT_m))
timebuf[1].tv_sec = stbuf.st_mtime;
}
}
result = (ENABLE_FEATURE_TOUCH_NODEREF && (opts & OPT_h) ? lutimes : utimes)(*argv, newtime);
if (result != 0) {
if (errno == ENOENT) { /* no such file? */
if (opts & OPT_c) {
@ -183,7 +214,7 @@ int touch_main(int argc UNUSED_PARAM, char **argv)
if (fd >= 0) {
xclose(fd);
if (reference_file || date_str)
utimes(*argv, timebuf);
utimes(*argv, newtime);
continue;
}
}