emo/busybox
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

touch: add conditional support for -h

Browse Source 
Based on a patch by Andy <andy.padavan@gmail.com>

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2013-09-11 11:58:33 +02:00
parent a613aa1b4c
commit b5352078a7
1 changed files with 35 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

39
coreutils/touch.c
View File

@ -26,6 +26,14 @@
//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
@ -42,6 +50,9 @@
//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"
@ -65,6 +76,7 @@
* 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
@ -79,6 +91,13 @@ 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 =
@ -86,6 +105,7 @@ int touch_main(int argc UNUSED_PARAM, char **argv)
"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;
@ -105,13 +125,13 @@ int touch_main(int argc UNUSED_PARAM, char **argv)
* 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)
);
opts &= 1; /* only -c bit is left */
argv += optind;
if (!*argv) {
bb_show_usage();
@ -121,6 +141,10 @@ int touch_main(int argc UNUSED_PARAM, char **argv)
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) {
@ -141,9 +165,16 @@ int touch_main(int argc UNUSED_PARAM, char **argv)
}
do {
if (utimes(*argv, (reference_file || date_str) ? timebuf : NULL) != 0) {
if (errno == ENOENT) { /* no such file */
if (opts) { /* creation is disabled, so ignore */
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 */