newlib/libc/string/strlwr.c

   1 /*
   2 FUNCTION
   3         <<strlwr>>---force string to lowercase
   4
   5 INDEX
   6         strlwr
   7
   8 SYNOPSIS
   9         #include <string.h>
  10         char *strlwr(char *<[a]>);
  11
  12 DESCRIPTION
  13         <<strlwr>> converts each character in the string at <[a]> to
  14         lowercase.
  15
  16 RETURNS
  17         <<strlwr>> returns its argument, <[a]>.
  18
  19 PORTABILITY
  20 <<strlwr>> is not widely portable.
  21
  22 <<strlwr>> requires no supporting OS subroutines.
  23
  24 QUICKREF
  25         strlwr
  26 */
  27
  28 #include <string.h>
  29 #include <ctype.h>
  30
  31 char *
  32 strlwr (char *s)
  33 {
  34   unsigned char *ucs = (unsigned char *) s;
  35   for ( ; *ucs != '\0'; ucs++)
  36     {
  37       *ucs = tolower(*ucs);
  38     }
  39   return s;
  40 }