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libc: Import strlcat from FreeBSD project 

From commit: 21571b1d140ae7bb44e94c0afba2ec61456b275b
Made small changes to fit into TF-A project

Change-Id: I07fd7fe1037857f6b299c35367c104fb51fa5cfa
Signed-off-by: Madhukar Pappireddy <madhukar.pappireddy@arm.com>
This commit is contained in:
Madhukar Pappireddy 2020-09-04 14:04:23 -05:00
parent ed39d5e3c0
commit 1123a5e2f9
2 changed files with 58 additions and 1 deletions
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3
include/lib/libc/string.h
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@ -4,7 +4,7 @@
* SPDX-License-Identifier: BSD-3-Clause
*/
/*
* Portions copyright (c) 2018-2019, ARM Limited and Contributors.
* Portions copyright (c) 2018-2020, ARM Limited and Contributors.
* All rights reserved.
*/
@ -26,5 +26,6 @@ size_t strlen(const char *s);
size_t strnlen(const char *s, size_t maxlen);
char *strrchr(const char *p, int ch);
size_t strlcpy(char * dst, const char * src, size_t dsize);
size_t strlcat(char * dst, const char * src, size_t dsize);
#endif /* STRING_H */

56
lib/libc/strlcat.c Normal file
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@ -0,0 +1,56 @@
/* $OpenBSD: strlcat.c,v 1.15 2015/03/02 21:41:08 millert Exp $ */
/*
* SPDX-License-Identifier: ISC
*
* Copyright (c) 1998, 2015 Todd C. Miller <Todd.Miller@courtesan.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, 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.
*/
#include <string.h>
/*
* Appends src to string dst of size dsize (unlike strncat, dsize is the
* full size of dst, not space left). At most dsize-1 characters
* will be copied. Always NUL terminates (unless dsize <= strlen(dst)).
* Returns strlen(src) + MIN(dsize, strlen(initial dst)).
* If retval >= dsize, truncation occurred.
*/
size_t
strlcat(char * dst, const char * src, size_t dsize)
{
const char *odst = dst;
const char *osrc = src;
size_t n = dsize;
size_t dlen;
/* Find the end of dst and adjust bytes left but don't go past end. */
while (n-- != 0 && *dst != '\0')
dst++;
dlen = dst - odst;
n = dsize - dlen;
if (n-- == 0)
return(dlen + strlen(src));
while (*src != '\0') {
if (n != 0) {
*dst++ = *src;
n--;
}
src++;
}
*dst = '\0';
return(dlen + (src - osrc)); /* count does not include NUL */
}