Re: [Libclc-developers] new function: clc_strrev

[Hallvard B F. <h.b...@us...>]

Bj=F8rn Augestad writes:
> Some sales pitches for clc_strrev. :-)

OK.

In that case, here is a smaller version.  I added clc_strnrev() too
since I imagine that can be useful sometimes, or at least faster when
we already know strlen.

BTW, I did as you said and replaced #include "clc_*" with <clc_*>:-)

Note: The 'if(len)' is a very slight optimization, it can be omitted
(and the end-- moved) at the price of an extra loop for uneven-length
strings.

/* $Id$ */
/*
 * Copyright(c) 2003, Hallvard B Furuseth <h.b...@us...>
 */
#include <string.h>
#include <clc_assert.h>
#include <clc_string.h>

char *
clc_strrev(char *s)
{
    clc_assert_not_null(clc_strrev, s);
    return clc_strnrev(s, strlen(s));
}

char *
clc_strnrev(char *s, size_t len)
{
     clc_assert_not_null(clc_strnrev, s);

     if(len) {
	 char *beg =3D s;
	 char *end =3D s + len - 1;
	 while (beg < end) {
	     char tmp =3D *end;
	     *end-- =3D *beg;
	     *beg++ =3D tmp;
	 }
     }

     return s;
}

--=20
Hallvard