Added day predictor

haiku.c

@@ -2,6 +2,7 @@
 #include <stdlib.h>
 #include <time.h>
 #include <sys/random.h>
+#include <errno.h>
 
 // Function to pick a random word/phrase from an array
 const char *randomWord(const char *words[], int size)
@@ -204,12 +205,35 @@ const char *randomLocation()
     return randomWord(locations, sizeof(locations) / sizeof(locations[0]));
 }
 
-int main()
+int main(int argc, char *argv[])
 {
+    int days = 1;
 
-    srand(time(NULL) / 86400); // today's haiku
-    // Construct a poem with 6 lines
-    // printf("An Hermetic Poem:\n\n");
+    if (argc > 1)
+    {
+        // error check strtol
+        char *endptr;
+        errno = 0;
+        days = strtol(argv[1], &endptr, 10);
+        if (errno != 0 || endptr == argv[1] || *endptr != '\0' || days <= 0)
+        {
+            fprintf(stderr, "Could not convert argument to integer\n");
+            printf("Usage: %s [days]\n", argv[0]);
+            return 1;
+        }
+    }
+
+    for (int day = 0; day < days; day++)
+    {
+
+        if (days != 1)
+        {
+            time_t t = time(NULL);
+            t += day * 86400;
+            struct tm tm = *localtime(&t);
+            printf("%d-%02d-%02d ", tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday);
+        }
+        srand(time(NULL) / 86400 + day); 
 
         int verseCount = 1; // haiku
         for (int i = 0; i < verseCount; i++)
@@ -519,6 +543,6 @@ int main()
                 break;
             }
         }
-    
+    }
     return 0;
 }