parse arguments

Signed-off-by: Mattias Andrée <maandree@operamail.com>

1 files changed, 68 insertions, 0 deletions

diff --git a/src/sleep-until.c b/src/sleep-until.c
new file mode 100644
index 0000000..1dcb3bb
--- /dev/null
+++ b/src/sleep-until.c
@@ -0,0 +1,68 @@
+/**
+ * sleep-until – Sleeps until a specified time
+ * 
+ * Copyright © 2015  Mattias Andrée (maandree@member.fsf.org)
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <sys/timerfd.h>
+#include <alloca.h>
+#include <string.h>
+#include <stdlib.h>
+
+
+
+int main(int argc, char* argv[])
+{
+  char* argv0;
+  char float_part[10];
+  struct itimerspec* values;
+  int i;
+  
+  if (argc < 2)
+    return 0;
+  
+  argv0 = argv[0];
+  argc--, argv--;
+  
+  values = alloca(argc * sizeof(*values));
+  memset(values, 0, argc * sizeof(*values));
+  float_part[9] = '\0';
+  for (i = 0; i < argc; i++)
+    {
+      char* p1 = argv[i];
+      char* p2 = strchr(p1, '.');
+      char excess;
+      size_t len;
+      if (p2)
+	*p2++ = '\0';
+      
+      values[i].it_value.tv_sec = (time_t)atoll(p1);
+      
+      if (p2)
+	{
+	  len = strlen(p2);
+	  memset(float_part, '0', 9 * sizeof(char));
+	  excess = len > 9 ? p2[9] : '0';
+	  len = len > 9 ? 9 : len;
+	  memcpy(float_part + 9 - len, p2, len * sizeof(char));
+	  values[i].it_value.tv_nsec = atol(float_part);
+	  if ((excess >= '5') && (values[i].it_value.tv_nsec++ == 999999999L))
+	    values[i].it_value.tv_nsec = 0, values[i].it_value.tv_sec++;
+	}
+    }
+  
+  return 0;
+}
+