Added touch (without timestamp and date option)

1 files changed, 109 insertions, 0 deletions

diff --git a/src/touch.c b/src/touch.c
new file mode 100644
index 0000000..dc048c0
--- /dev/null
+++ b/src/touch.c
@@ -0,0 +1,109 @@
+#define _POSIX_C_SOURCE 200809L
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <sys/time.h>
+#include <sys/stat.h>
+#include <string.h>
+#include <errno.h>
+#include <fcntl.h>
+
+static char *g_name = "touch";
+
+void fatal(const char *format, ...)
+{
+	va_list	ap;
+
+	va_start(ap, format);
+	fprintf(stderr, "%s: ", g_name);
+	vfprintf(stderr, format, ap);
+	fputc('\n', stderr);
+	va_end(ap);
+	exit(EXIT_FAILURE);
+}
+
+enum flags
+{
+	FLAG_ACCESS_ONLY       = 1 << 0,
+	FLAG_MODIFICATION_ONLY = 1 << 1,
+	FLAG_NO_CREATE         = 1 << 2,
+	FLAG_NO_DEREFERENCE    = 1 << 3,
+};
+
+int main(int argc, char **argv)
+{
+	int        option;
+	enum flags flags = 0;
+	char       *reference_filepath = NULL;
+
+	g_name = argv[0];
+	while ((option = getopt(argc, argv, "acd:fhr:t")) != -1)
+	{
+		switch (option)
+		{
+			case 'a': flags |= FLAG_ACCESS_ONLY;       break;
+			case 'm': flags |= FLAG_MODIFICATION_ONLY; break;
+			case 'c': flags |= FLAG_NO_CREATE;         break;
+			case 'h': flags |= FLAG_NO_DEREFERENCE;    break;
+
+			case 'd': exit(1); break;
+			case 't': exit(1); break;
+
+			case 'r': reference_filepath = optarg; break;
+
+			case 'f': break;
+		}
+	}
+	if (optind == argc)
+		fatal("missing file operand");
+
+	struct timeval times[2];
+	if (reference_filepath != NULL)
+	{
+		struct stat statbuf;
+		if (stat(reference_filepath, &statbuf) == -1)
+			fatal("%s", strerror(errno));
+		times[0].tv_sec  = statbuf.st_atim.tv_sec;
+		times[0].tv_usec = statbuf.st_atim.tv_nsec / 1000;
+		times[1].tv_sec  = statbuf.st_mtim.tv_sec;
+		times[1].tv_usec = statbuf.st_mtim.tv_nsec / 1000;
+	}
+	else
+	{
+		struct timeval now;
+		gettimeofday(&now, NULL);
+		memcpy(&times[0], &now, sizeof(struct timeval));
+		memcpy(&times[1], &now, sizeof(struct timeval));
+	}
+
+	for (; optind < argc; optind++)
+	{
+		struct stat statbuf;
+		if (stat(argv[optind], &statbuf) == -1)
+		{
+			if (!(flags & FLAG_NO_CREATE))
+				if (close(creat(argv[optind], 0644)) == -1)
+				{
+					fprintf(stderr, "%s: cannot create '%s': %s", g_name, argv[optind], strerror(errno));
+					continue;
+				}
+			fprintf(stderr, "%s: cannot atouch '%s': %s", g_name, argv[optind], strerror(errno));
+			continue;
+		}
+		if (flags & FLAG_ACCESS_ONLY)
+		{
+			times[1].tv_sec  = statbuf.st_mtim.tv_sec;
+			times[1].tv_usec = statbuf.st_mtim.tv_nsec / 1000;
+		}
+		else if (flags & FLAG_MODIFICATION_ONLY)
+		{
+			times[0].tv_sec  = statbuf.st_atim.tv_sec;
+			times[0].tv_usec = statbuf.st_atim.tv_nsec / 1000;
+		}
+		if (utimes(argv[optind], times) == -1)
+			fprintf(stderr, "%s: cannot touch '%s': %s", g_name, argv[optind], strerror(errno));
+	}
+
+	return EXIT_SUCCESS;
+}