Add the touch command to toolbox.
I wrote this to test my fix to support utime(2) system calls in the
sdcard fuse filesystem for stingray, and decided to finish sprucing
it up and make it part of toolbox. In an effort to keep it small,
it doesn't accept dates a la touch, but just a time_t value.
Change-Id: I5dd011cd2e34d0cc605d6f40e46b96a8c949f194
diff --git a/toolbox/touch.c b/toolbox/touch.c
new file mode 100644
index 0000000..b8ab310
--- /dev/null
+++ b/toolbox/touch.c
@@ -0,0 +1,87 @@
+#include <stdio.h>
+#include <string.h>
+#include <sys/types.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <stdlib.h>
+#include <fcntl.h>
+
+static void usage(void)
+{
+ fprintf(stderr, "touch: usage: touch [-alm] [-t time_t] <file>\n");
+ exit(1);
+}
+
+int touch_main(int argc, char *argv[])
+{
+ int i, fd, aflag = 0, mflag = 0, debug = 0, flags = 0;
+ struct timespec specified_time, times[2];
+ char *file = 0;
+
+ specified_time.tv_nsec = UTIME_NOW;
+
+ for (i = 1; i < argc; i++) {
+ if (argv[i][0] == '-') {
+ /* an option */
+ const char *arg = argv[i]+1;
+ while (arg[0]) {
+ switch (arg[0]) {
+ case 'a': aflag = 1; break;
+ case 'm': mflag = 1; break;
+ case 't':
+ if ((i+1) >= argc)
+ usage();
+ specified_time.tv_sec = atol(argv[++i]);
+ if (specified_time.tv_sec == 0) {
+ fprintf(stderr, "touch: invalid time_t\n");
+ exit(1);
+ }
+ specified_time.tv_nsec = 0;
+ break;
+ case 'l': flags |= AT_SYMLINK_NOFOLLOW; break;
+ case 'd': debug = 1; break;
+ default:
+ usage();
+ }
+ arg++;
+ }
+ } else {
+ /* not an option, and only accept one filename */
+ if (i+1 != argc)
+ usage();
+ file = argv[i];
+ }
+ }
+
+ if (! file) {
+ fprintf(stderr, "touch: no file specified\n");
+ exit(1);
+ }
+
+ if (access(file, F_OK))
+ if ((fd=creat(file, 0666)) != -1)
+ close(fd);
+
+ if ((mflag == 0) && (aflag == 0))
+ aflag = mflag = 1;
+
+ if (aflag)
+ times[0] = specified_time;
+ else
+ times[0].tv_nsec = UTIME_OMIT;
+
+ if (mflag)
+ times[1] = specified_time;
+ else
+ times[1].tv_nsec = UTIME_OMIT;
+
+ if (debug) {
+ fprintf(stderr, "file = %s\n", file);
+ fprintf(stderr, "times[0].tv_sec = %ld, times[0].tv_nsec = %ld\n", times[0].tv_sec, times[0].tv_nsec);
+ fprintf(stderr, "times[1].tv_sec = %ld, times[1].tv_nsec = %ld\n", times[1].tv_sec, times[1].tv_nsec);
+ fprintf(stderr, "flags = 0x%8.8x\n", flags);
+ }
+
+ return utimensat(AT_FDCWD, file, times, flags);
+}
+