[Libclc-developers] new function: clc_strrev

[<bo...@me...>]

We can't have a string module without a strrev function, can we?
I could not find a proposal for one on google, so here is my version.
q1: Do we need it?
q2: any bugs?
q3: other comments?

Enjoy.
Bjørn


/* $id$
  * Copyright(c) 2003, B. Augestad (bo...@me...)
  */

/* documentation start:
SYNOPSIS
     #include <clc_string.h>
     char* clc_strrev(char* s);

DESCRIPTION
     clc_strrev() - reverses the contents of a string.

PARAMETERS
     s - The string to reverse

RETURN VALUE
     Returns the parameter s

ERROR HANDLING
     The release version of libclc performs no error checking. The debug
     version asserts that s isn't a NULL pointer.

EXAMPLE
     char buf[100];
     strcpy(buf, "Hello, World");
     clc_strrev(buf);
     printf("%s\n", buf);

AUTHOR
     B. Augestad, bo...@me...

BUGS
     None known

  * documentation end:
  */

#include <string.h>

#include "clc_assert.h"
#include "clc_string.h"

char* clc_strrev(char* s)
{
     size_t left, right, middle, cb;

     clc_assert_not_null(clc_strrev, s);

     cb = strlen(s);
     middle = cb / 2;
     for(left = 0; left < middle; left++) {
         char tmp;

         right = cb - left - 1;
         tmp = s[left];
         s[left] = s[right];
         s[right] = tmp;
     }

     return s;
}

#ifdef CLC_TEST
int main(void)
{
     char odd[100], even[100], empty[100];

     strcpy(odd, "12345");
     strcpy(even, "123456");
     strcpy(empty, "");

     printf("odd  :%s\n", clc_strrev(odd));
     printf("even :%s\n", clc_strrev(even));
     printf("empty:%s\n", clc_strrev(empty));

     return 0;
}
#endif