1 files changed, 58 insertions, 0 deletions
diff --git a/timer.c b/timer.c
new file mode 100644
index 0000000..5ab51c6
--- /dev/null
+++ b/timer.c
@@ -0,0 +1,58 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+
+unsigned long long int get_seconds(char *);
+
+void usage(char *cmd)
+{
+    printf("Usage:\n"
+           "    %s <n>{s,m,h,D,M,Y} ...\n", cmd);
+}
+
+int main(int argc, char **argv)
+{
+    if (argc < 2) {
+        printf("Not enough arguments.\n");
+        usage(argv[0]);
+        exit(1);
+    }
+
+    unsigned long long int total_seconds = 0;
+
+    int i;
+    for (i = 1; i < argc; i++)
+        total_seconds += get_seconds(argv[i]);
+
+    printf("Total time: %llu second(s).\n", total_seconds);
+
+    return 0;
+}
+
+unsigned long long int get_seconds(char *code)
+{
+    int length = strlen(code);
+    if (length < 2) {
+        return 0;
+    }
+
+    int multiplier = 0;
+    char suffix = code[length - 1];
+    switch (suffix) {
+        case 's': multiplier = 1; break; // 1 second
+        case 'm': multiplier = 60; break; // 1 minute
+        case 'h': multiplier = 3600; break; // 1 hour
+        case 'D': multiplier = 86400; break; // 1 day
+        case 'M': multiplier = 2419200; break; // 28 days
+        case 'Y': multiplier = 31536000; break; // 365 days
+        default : return 0;
+    }
+
+    char value[length + 1];
+    strcpy(value, code);
+
+    value[length - 1] = '\0';
+
+    return strtoull(value, NULL, 10) * multiplier;
+}