1 #include "case.h" 2 case_lowerb(s,len)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 } 15