toolchain/gcc/newlib/libc/string/strlwr.c

   1 /*
   2 FUNCTION
   3         <<strlwr>>---force string to lower case
   4
   5 INDEX
   6         strlwr
   7
   8 ANSI_SYNOPSIS
   9         #include <string.h>
  10         char *strlwr(char *<[a]>);
  11
  12 TRAD_SYNOPSIS
  13         #include <string.h>
  14         char *strlwr(<[a]>)
  15         char *<[a]>;
  16
  17 DESCRIPTION
  18         <<strlwr>> converts each characters in the string at <[a]> to
  19         lower case.
  20
  21 RETURNS
  22         <<strlwr>> returns its argument, <[a]>.
  23
  24 PORTABILITY
  25 <<strlwr>> is not widely portable.
  26
  27 <<strlwr>> requires no supporting OS subroutines.
  28
  29 QUICKREF
  30         strlwr
  31 */
  32
  33 #include <string.h>
  34 #include <ctype.h>
  35
  36 char *
  37 strlwr (a)
  38      char *a;
  39 {
  40   char *ret = a;
  41
  42   while (*a != '\0')
  43     {
  44       if (isupper (*a))
  45         *a = tolower (*a);
  46       ++a;
  47     }
  48
  49   return ret;
  50 }