Merge "Add the touch command to toolbox."

2 files changed, 88 insertions, 0 deletions

diff --git a/toolbox/Android.mk b/toolbox/Android.mk
index ff01172e..76542a63 100644
--- a/toolbox/Android.mk
+++ b/toolbox/Android.mk
@@ -54,6 +54,7 @@ TOOLS := \
 	vmstat \
 	nandread \
 	ionice \
+	touch \
 	lsof
 
 LOCAL_SRC_FILES:= \
diff --git a/toolbox/touch.c b/toolbox/touch.c
new file mode 100644
index 00000000..b8ab310d
--- /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);
+}
+