File: [local] / prex / sys / lib / string.c (download)
Revision 1.1.1.1 (vendor branch), Tue Aug 19 12:46:56 2008 UTC (16 years ago) by nbrk
Branch: MAIN, KOHSUKE
CVS Tags: PREX_0_8_BASE, HEAD Changes since 1.1: +0 -0 lines
Initial import of Prex, Portable Real-time Embedded POSIX microkernel system.
I have totally new directions in my development (more focused on real hardware, not virtual one).
Old hacks are available in prex-old module. They will be carefully re-designed and merged soon.
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/*-
* Copyright (c) 2005-2006, Kohsuke Ohtani
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* string.c - Minimum string library for kernel
*/
#include <sys/types.h>
#include <kernel.h>
/*
* Safer version of strncpy
* The destination string is always terminated with NULL character.
*/
size_t
strlcpy(char *dest, const char *src, size_t count)
{
char *d = dest;
const char *s = src;
size_t n = count;
/* Copy as many bytes as will fit */
if (n != 0 && --n != 0) {
do {
if ((*d++ = *s++) == 0)
break;
} while (--n != 0);
}
/* Not enough room in dst, add NUL and traverse rest of src */
if (n == 0) {
if (count != 0)
*d = '\0'; /* NUL-terminate dst */
while (*s++)
;
}
return (size_t)(s - src - 1); /* count does not include NUL */
}
int
strncmp(const char *src, const char *tgt, size_t count)
{
signed char res = 0;
while (count) {
if ((res = *src - *tgt++) != 0 || !*src++)
break;
count--;
}
return res;
}
/* The returned size does not include the last NULL char */
size_t
strnlen(const char *str, size_t count)
{
const char *tmp;
for (tmp = str; count-- && *tmp != '\0'; ++tmp);
return (size_t)(tmp - str);
}
void *
memcpy(void *dest, const void *src, size_t count)
{
char *tmp = (char *)dest, *s = (char *)src;
while (count--)
*tmp++ = *s++;
return dest;
}
void *
memset(void *dest, int ch, size_t count)
{
char *p = (char *)dest;
while (count--)
*p++ = (char)ch;
return dest;
}