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

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2000-02-18 03:39:52 +08:00
/*
FUNCTION
<<strlwr>>---force string to lowercase
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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 character in the string at <[a]> to
lowercase.
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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;
}