view lwlib/lw_string.c @ 370:8764142b3192

Convert internal error/warning handling framework to a new unified system Replace the ad hoc error and warning handling with a new system that codifies the errors with specific codes. This makes it possible in the future for error numbers to be used for testing and other purposes. It also makes sure the error strings themselves are consistent. Thanks to Erik G <erik@6809.org> for the patch.
author William Astle <lost@l-w.ca>
date Mon, 22 Jun 2015 18:49:38 -0600
parents 2c24602be78f
children 8e25147c2aa8
line wrap: on
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/*
lw_string.c

Copyright © 2010 William Astle

This file is part of LWTOOLS.

LWTOOLS 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 3 of the License, 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.

You should have received a copy of the GNU General Public License along with
this program. If not, see <http://www.gnu.org/licenses/>.
*/

#include <string.h>
#include <stdlib.h>

#define ___lw_string_c_seen___
#include "lw_alloc.h"
#include "lw_string.h"

char *lw_strdup(const char *s)
{
	char *r;
	
	if (!s)
		s = "(null)";

	r = lw_alloc(strlen(s) + 1);
	strcpy(r, s);
	return r;
}

char *lw_strndup(const char *s, int len)
{
	char *r;
	int sl;
	
	sl = strlen(s);
	if (sl > len)
		sl = len;
	
	r = lw_alloc(sl + 1);
	memmove(r, s, sl);
	r[sl] = '\0';
	return r;
}

char *lw_token(const char *s, int sep, const char **ap)
{
	const char *p;
	char *r;

	if (!s)
		return NULL;
	
	p = strchr(s, sep);
	if (!p)
	{
		if (ap)
			*ap = NULL;
		return lw_strdup(s);
	}
	
	r = lw_alloc(p - s + 1);
	strncpy(r, (char *)s, p - s);
	r[p - s] = '\0';
	
	if (ap)
	{
		while (*p && *p == sep)
			p++;
		*ap = p;
	}
	return r;
}