learning-cc4e

Solution to https://cc4e.com/. If you copy these you're not right in the head.
git clone https://kaka.farm/~git/learning-cc4e
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solution.c (563B)

      1 int atoi(s) /* convert s to integer */
      2 char s[];
      3 {
      4     int i, n;
      5 
      6     n = 0;
      7     for (i = 0; s[i] >= '0' && s[i] <= '9'; ++i)
      8         n = 10 * n + s[i] - '0';
      9     return(n);
     10 }
     11 
     12 int htoi(s)
     13   char s[];
     14 {
     15   int n;
     16   char *p;
     17 
     18   n = 0;
     19   for (p = s;
     20        (*p >= '0' && *p <= '9')
     21        || (*p >= 'a' && *p <= 'f')
     22        || (*p >= 'A' && *p <= 'F');
     23        ++p) {
     24     n *= 16;
     25     if (*p >= '0' && *p <= '9') {
     26       n += *p - '0';
     27     } else if (*p >= 'a' && *p <= 'f') {
     28       n += *p - 'a' + 10;
     29     } else {
     30       n += *p - 'A' + 10;
     31     }
     32   }
     33   return(n);
     34 }