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scan_ulong.c (361B)

      1 /* Public domain. */
      2 
      3 #include "scan.h"
      4 
      5 unsigned int scan_ulong(register const char *s,register unsigned long *u)
      6 {
      7   register unsigned int pos = 0;
      8   register unsigned long result = 0;
      9   register unsigned long c;
     10   while ((c = (unsigned long) (unsigned char) (s[pos] - '0')) < 10) {
     11     result = result * 10 + c;
     12     ++pos;
     13   }
     14   *u = result;
     15   return pos;
     16 }