2021 templates

2021/templates/ex1-c.c

@@ -0,0 +1,58 @@
+/* ex1-c: Advent2021 game, day 1/game 1
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include "debug.h"
+
+#define	XMOVE 3
+
+int my_strlen(str)
+    char *str;
+{
+    int i;
+    for (i=0; *str; ++i, ++str)
+        ;
+    return i;
+}
+
+static int usage(char *prg)
+{
+    fprintf(stderr, "Usage: %s [-ilw] [file...]\n", prg);
+    return 1;
+}
+
+int main(int ac, char **av)
+{
+    int opt;
+    char str[80];
+
+    while ((opt = getopt(ac, av, "d:f:")) != -1) {
+        switch (opt) {
+            case 'd':
+                debug_level_set(atoi(optarg));
+                break;
+            default:
+                return usage(*av);
+        }
+    }
+    printf("optind = %d ac = %d\n", optind, ac);
+
+    if (optind < ac)
+        return usage(*av);
+
+    scanf("%s", str);          /* ignore 1st line */
+
+    while (scanf("%s", str) != EOF) {
+        line++;
+        col+=XMOVE;
+        linelen=my_strlen(str);
+        mod=col%linelen;
+        if (*(str+mod) == '#')
+            count++;
+    }
+    printf ("%s : lines:%d pos:%d found:%d\n", *av, line, col, count);
+    exit (0);
+}