src/stdImpl.c

/*
 * COPYRIGHT AND PERMISSION NOTICE
 * 
 * Copyright (c) 2003 Embedded Unit Project
 * 
 * All rights reserved.
 * 
 * Permission is hereby granted, free of charge, to any person obtaining 
 * a copy of this software and associated documentation files (the 
 * "Software"), to deal in the Software without restriction, including 
 * without limitation the rights to use, copy, modify, merge, publish, 
 * distribute, and/or sell copies of the Software, and to permit persons 
 * to whom the Software is furnished to do so, provided that the above 
 * copyright notice(s) and this permission notice appear in all copies 
 * of the Software and that both the above copyright notice(s) and this 
 * permission notice appear in supporting documentation.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT 
 * OF THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 
 * HOLDERS INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY 
 * SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER 
 * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF 
 * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN 
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 * 
 * Except as contained in this notice, the name of a copyright holder 
 * shall not be used in advertising or otherwise to promote the sale, 
 * use or other dealings in this Software without prior written 
 * authorization of the copyright holder.
 *
 * $Id: stdImpl.c,v 1.3 2004/02/10 16:15:25 arms22 Exp $
 */
#include "stdImpl.h"

char* stdimpl_strcpy(char *dst, const char *src)
{
	char *start = dst;
	char c;
	do {
		c = *src;
		*dst = c;
		src++;
		dst++;
	} while (c);
	return start;
}

char* stdimpl_strcat(char *dst, const char *src)
{
	char *start = dst;
	char c;
	do {
		c = *dst;
		dst++;
	} while (c);
	dst--;
	do {
		c = *src;
		*dst = c;
		src++;
		dst++;
	} while (c);
	return start;
}

char* stdimpl_strncat(char *dst, const char *src,unsigned int count)
{
	char *start = dst;
	char c;
	do {
		c = *dst;
		dst++;
	} while (c);
	dst--;
	if (count) {
		do {
			c = *src;
			*dst = c;
			src++;
			dst++;
			count--;
		} while (c && count);
		*dst = '\0';
	}
	return start;
}

int stdimpl_strlen(const char *str)
{
    const char *estr = str;
	char c;
	do {
		c = *estr;
		estr++;
	} while (c);
    return ((int)(estr - str - 1));
}

int stdimpl_strcmp(const char *s1, const char *s2)
{
	char c1,c2;
	do {
		c1 = *s1++;
		c2 = *s2++;
	} while ((c1) && (c2) && (c1==c2));
	return c1 - c2;
}

static char* _xtoa(unsigned long v,char *string, int r, int is_neg)
{
	char *start = string;
	char buf[33],*p;

	p = buf;

	do {
		*p++ = "0123456789abcdef"[(v % r) & 0xf];
	} while (v /= r);

	if (is_neg) {
		*p++ = '-';
	}

	do {
		*string++ = *--p;
	} while (buf != p);

	*string = '\0';

	return start;
}

char* stdimpl_itoa(int v,char *string,int r)
{
    if ((r == 10) && (v < 0)) {
		return _xtoa((unsigned long)(-v), string, r, 1);
	}
	return _xtoa((unsigned long)(v), string, r, 0);
}