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case_lowerb.c (193B)

      1 #include "case.h"
      2 
      3 void case_lowerb(s,len)
      4 char *s;
      5 unsigned int len;
      6 {
      7   unsigned char x;
      8   while (len > 0) {
      9     --len;
     10     x = *s - 'A';
     11     if (x <= 'Z' - 'A') *s = x + 'a';
     12     ++s;
     13   }
     14 }