newlib-cygwin/newlib/libc/string/strlwr.c

51 lines
661 B
C
Raw Normal View History

2000-02-18 03:39:52 +08:00
/*
FUNCTION
<<strlwr>>---force string to lower case
INDEX
strlwr
ANSI_SYNOPSIS
#include <string.h>
char *strlwr(char *<[a]>);
TRAD_SYNOPSIS
#include <string.h>
char *strlwr(<[a]>)
char *<[a]>;
DESCRIPTION
<<strlwr>> converts each characters in the string at <[a]> to
lower case.
RETURNS
<<strlwr>> returns its argument, <[a]>.
PORTABILITY
<<strlwr>> is not widely portable.
<<strlwr>> requires no supporting OS subroutines.
QUICKREF
strlwr
*/
#include <string.h>
#include <ctype.h>
char *
strlwr (a)
char *a;
{
char *ret = a;
while (*a != '\0')
{
if (isupper (*a))
*a = tolower (*a);
++a;
}
return ret;
}