rename repo, subdir for yearly challenges

2020/day04/ex1-c.c

@@ -0,0 +1,132 @@
+/* ex1-c: Advent2020 game, day 4/game 1
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+struct key {
+     int mandatory;
+     char *key;
+     char val[80];
+} keys[] = {
+     { 1, "byr", "" },
+     { 1, "iyr", "" },
+     { 1, "eyr", "" },
+     { 1, "hgt", "" },
+     { 1, "hcl", "" },
+     { 1, "ecl", "" },
+     { 1, "pid", "" },
+     { 0, "cid", "" },
+     { -1, NULL,  "" }
+};
+
+int my_strlen(str)
+     char *str;
+{
+     int i;
+     for (i=0; *str; ++i, ++str)
+          ;
+     return i;
+}
+
+int my_strcmp(str1, str2)
+     char *str1, *str2;
+{
+     for(; *str1 && (*str1==*str2); str1++, str2++)
+          ;
+     return *str1 - *str2;
+}
+
+char *my_strcpy(dst, src)
+     char *dst, *src;
+{
+     char *p=dst;
+     while (*dst++ = *src++)
+          ;
+     return p;
+}
+
+struct key *get_key(key)
+     char *key;
+{
+     int i=0, found=0;
+
+     for (i=0; keys[i].mandatory != -1; ++i) {
+          if (!my_strcmp(keys[i].key, key)) {
+               found=1;
+               break;
+          }
+     }
+     return found? &keys[i]: NULL;
+}
+
+struct key *set_key(key, val)
+     char *key, *val;
+{
+     struct key *thekey;
+
+     if (thekey=get_key(key))
+         my_strcpy(thekey->val, val);
+     return thekey;
+}
+
+void print_keys()
+{
+     int i=0;
+
+     printf("keys: \n");
+     for (i=0; keys[i].mandatory != -1; ++i)
+          printf("\t[%s]=[%s]\n", keys[i].key, keys[i].val);
+     return;
+}
+
+void reset_keys()
+{
+     int i=0;
+     for (i=0; keys[i].mandatory != -1; ++i)
+          *keys[i].val='\0';
+     return;
+}
+
+int valid_passport()
+{
+     int valid=1;
+     struct key *key=&keys[0];
+
+     while (key->mandatory != -1) {
+          if (key->mandatory && !*key->val) {
+               valid=0;
+               break;
+          }
+          key++;
+     }
+     return valid;
+}
+
+int main(ac, av)
+     char **av;
+{
+    int consumed, nkeys, nvalid=0, count=0;
+     char line[160], key[80], val[80];
+     char *p;
+
+     while (fgets(line, sizeof line, stdin)) {
+          nkeys=0;
+          p=line;
+          consumed=1;
+          while (sscanf(p, "%[^:]: %s %n", key, val, &consumed)==2) {
+               set_key(key, val);
+               p+=consumed;
+               nkeys++;
+          }
+          if (!nkeys) {         /* empty line: reset */
+               nvalid += valid_passport();
+               count++;
+               reset_keys();
+          }
+     }
+     nvalid += valid_passport();
+     count++;
+     printf("%s : valid=%d/%d\n", *av, nvalid, count);
+     exit (0);
+}