[Toybox] [PATCH 2/2] Add a "touch" command.

[Avery Pennarun]

Doesn't implement optional manual setting of timestamp; just uses the
current time, which is the most common use case.
---
 toys.h       |    1 +
 toys/touch.c |   57 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 58 insertions(+), 0 deletions(-)
 create mode 100644 toys/touch.c

diff --git a/toys.h b/toys.h
index 4a84bf4..2cc58af 100644
--- a/toys.h
+++ b/toys.h
@@ -37,6 +37,7 @@
 #include <sys/statvfs.h>
 #include <sys/sysinfo.h>
 #include <sys/swap.h>
+#include <sys/time.h>
 #include <sys/times.h>
 #include <sys/types.h>
 #include <sys/utsname.h>
diff --git a/toys/touch.c b/toys/touch.c
new file mode 100644
index 0000000..4bbfacd
--- /dev/null
+++ b/toys/touch.c
@@ -0,0 +1,57 @@
+/* vi: set sw=4 ts=4:
+ *
+ * touch.c - Create files and update their atime/mtime.
+ *
+ * Copyright 2012 Avery Pennarun <apenwarr at gmail.com>
+ *
+ * See http://www.opengroup.org/onlinepubs/009695399/utilities/touch.html
+ *
+USE_CP(NEWTOY(touch, "<1", TOYFLAG_BIN))
+
+config TOUCH
+	bool "touch"
+	default n
+	help
+	  usage: touch <filenames...>
+
+	  Updates the timestamps on the given files, and creates them if
+	  they do not exist.
+*/
+
+#include "toys.h"
+
+#define TT this.touch
+
+
+void touch_file(char *filename, struct timeval *times)
+{
+	int fd = -1;
+
+	if (utimes(filename, times) < 0) {
+		if (errno != ENOENT) {
+			perror_exit("utimes(%s)", filename);
+		} else {
+			fd = open(filename, O_WRONLY|O_CREAT, 0666);
+			if (fd < 0) {
+				perror_exit("open '%s'", filename);
+			}
+			xclose(fd);
+		}
+	}
+}
+
+
+void touch_main(void)
+{
+	struct timeval times[2];
+	struct timezone tz;
+	int i;
+
+	gettimeofday(&times[0], &tz);
+	times[1] = times[0];
+
+	for (i=0; i<toys.optc; i++) {
+		char *filename = toys.optargs[i];
+		touch_file(filename, times);
+	}
+}
-- 
1.7.9.dirty