parse arguments

Signed-off-by: Mattias Andrée <maandree@member.fsf.org>

1 files changed, 103 insertions, 0 deletions

diff --git a/src/sat.c b/src/sat.c
new file mode 100644
index 0000000..4860a4d
--- /dev/null
+++ b/src/sat.c
@@ -0,0 +1,103 @@
+/**
+ * Copyright © 2015  Mattias Andrée <maandree@member.fsf.org>
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+#include "parse_time.h"
+
+
+
+/**
+ * The name of the process.
+ */
+char *argv0 = "sat";
+
+
+
+/**
+ * Print usage information.
+ */
+static void
+usage(void)
+{
+	fprintf(stderr, "usage: %s TIME COMMAND...\n",
+	        strrchr(argv0) ? (strrchr(argv0) + 1) : argv0);
+	exit(2);
+}
+
+
+/**
+ * Queue a job for later execution.
+ * 
+ * @param  argc  You guess!
+ * @param  argv  The first element should be the name of the process,
+ *               the second argument should be the POSIX time (seconds
+ *               since Epoch (1970-01-01 00:00:00 UTC), disregarding
+ *               leap seconds) the job shall be executed. The rest of
+ *               the arguments (being at least one) shoul be the
+ *               command line arguments for the job the run.
+ * @return  0    The process was successful.
+ * @return  1    The process failed queuing the job.
+ * @return  2    User error, you do not know what you are doing.
+ * @return  3    satd(1) failed to queue the job.
+ */
+int
+main(int argc, char *argv[])
+{
+	struct timespec ts;
+	clockid_t clk;
+
+	if ((argc < 3) || (argv[1][0] == '-')) {
+		usage();
+	}
+
+	argv0 = argv[0];
+
+	if (parse_time(str, &ts, &clk)) {
+		switch (errno) {
+		case EINVAL:
+			fprintf(stderr,
+			        "%s: time parameter cound not be parsed, perhaps you "
+			        "you need an external parser: %s\n", argv0, str);
+			return 2;
+		case ERANGE:
+			fprintf(stderr,
+			        "%s: the specified time is beyond the limit of what "
+				"can be represented by `struct timespec`: %s\n", argv0, str);
+			return 2;
+		case EDOM:
+			fprintf(stderr,
+			        "%s: the specified time is in past, and more than "
+				"a day ago: %s\n", argv0, str);
+			return 2;
+		default:
+			goto fail;
+		}
+	}
+
+fail:
+	perror(argv0);
+	return 1;
+}
+