added multi-call support (improved err messaging)

1 files changed, 16 insertions, 6 deletions

diff --git a/timer.c b/timer.c
index 0e4ce7c..ad479e7 100644
--- a/timer.c
+++ b/timer.c
@@ -1,16 +1,26 @@
 #include <stdio.h>
+#include <stdlib.h>
 #include <unistd.h>
 
 int main(int argc, char** argv){
   int min; int sec;
-  if (argc != 2) return 1;
+  if (argc < 2){
+    perror("format: `timer mins:secs [# of timers to run]`");
+    return 1;
+  }
+  int times = 1;
+  if (argc >= 3){
+    sscanf(argv[2], "%d", &times);
+  }
   sscanf(argv[1], "%d:%d", &min, &sec);
   int time = min*60 + sec;
-  for (int i = 1; i<=time; i++){
-    printf("%d:%02d/%d:%02d\r", (i-i%60)/60, i%60, min, sec);
-    fflush(stdout);
-    sleep(1);
+  for (int j = 0; j<times; j++){
+    for (int i = 1; i<=time; i++){
+      printf("%d:%02d/%d:%02d\r", (i-i%60)/60, i%60, min, sec);
+      fflush(stdout);
+      sleep(1);
+    }
+    printf("\n");
   }
-  printf("\n");
   return 0;
 }