/* $Id: text.c,v 1.3 2003-03-13 05:20:06 rjkaes Exp $
 *
 * The functions included here are useful for text manipulation.  They
 * replace or augment the standard C string library.  These functions
 * are either safer replacements, or they provide services not included
 * with the standard C string library.
 *
 * Copyright (C) 2002  Robert James Kaes (rjkaes@flarenet.com)
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2, or (at your option) any
 * later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 */

#include "tinyproxy.h"

#include "text.h"

#ifndef HAVE_STRLCPY
/*
 * Function API taken from OpenBSD. Like strncpy(), but does not 0 fill the
 * buffer, and always NULL terminates the buffer. size is the size of the
 * destination buffer.
 */
size_t
strlcpy(char *dst, const char *src, size_t size)
{
	size_t len = strlen(src);
	size_t ret = len;

	if (len >= size)
		len = size - 1;

	memcpy(dst, src, len);
	dst[len] = '\0';

	return ret;
}
#endif

#ifndef HAVE_STRLCAT
/*
 * Function API taken from OpenBSD. Like strncat(), but does not 0 fill the
 * buffer, and always NULL terminates the buffer. size is the length of the
 * buffer, which should be one more than the maximum resulting string
 * length.
 */
size_t
strlcat(char *dst, const char *src, size_t size)
{
	size_t len1 = strlen(dst);
	size_t len2 = strlen(src);
	size_t ret = len1 + len2;

	if (len1 + len2 >= size)
		len2 = size - len1 - 1;
	if (len2 > 0) {
		memcpy(dst + len1, src, len2);
		dst[len1 + len2] = '\0';
	}

	return ret;
}
#endif

/*
 * Removes any new-line or carriage-return characters from the end of the
 * string. This function is named after the same function in Perl.
 * "length" should be the number of characters in the buffer, not including
 * the trailing NULL.
 *
 * Returns the number of characters removed from the end of the string.  A
 * negative return value indicates an error.
 */
ssize_t
chomp(char *buffer, size_t length)
{
	size_t chars;

	assert(buffer != NULL);
	assert(length > 0);

	/* Make sure the arguments are valid */
	if (buffer == NULL) return -EFAULT;
	if (length < 1) return -ERANGE;

	chars = 0;

	--length;
	while (buffer[length] == '\r' || buffer[length] == '\n') {
		buffer[length] = '\0';
		chars++;

		/* Stop once we get to zero to prevent wrap-around */
		if (length-- == 0) break;
	}

	return chars;
}