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/********************************************************************\
Name: strlcpy.c
Created by: Stefan Ritt
Copyright 2000 + Stefan Ritt
Contents: Contains strlcpy and strlcat which are versions of
strcpy and strcat, but which avoid buffer overflows
This file is part of MIDAS XML Library.
MIDAS XML Library 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.
MIDAS XML Library 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 MIDAS XML Library. If not, see <http://www.gnu.org/licenses/>.
\********************************************************************/
#include <stdio.h>
#include <string.h>
#include "strlcpy.h"
/*
* Copy src to string dst of size siz. At most siz-1 characters
* will be copied. Always NUL terminates (unless size == 0).
* Returns strlen(src); if retval >= siz, truncation occurred.
*/
#ifndef STRLCPY_DEFINED
size_t strlcpy
(char *dst
, const char *src
, size_t size
)
{
char *d
= dst
;
const char *s
= src
;
size_t n
= size
;
/* 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 (size
!= 0)
*d
= '\0'; /* NUL-terminate dst */
while (*s
++);
}
return (s
- src
- 1); /* count does not include NUL */
}
/*-------------------------------------------------------------------*/
/*
* Appends src to string dst of size siz (unlike strncat, siz is the
* full size of dst, not space left). At most siz-1 characters
* will be copied. Always NUL terminates (unless size <= strlen(dst)).
* Returns strlen(src) + MIN(size, strlen(initial dst)).
* If retval >= size, truncation occurred.
*/
size_t strlcat
(char *dst
, const char *src
, size_t size
)
{
char *d
= dst
;
const char *s
= src
;
size_t n
= size
;
size_t dlen
;
/* Find the end of dst and adjust bytes left but don't go past end */
while (n
-- != 0 && *d
!= '\0')
d
++;
dlen
= d
- dst
;
n
= size
- dlen
;
if (n
== 0)
return (dlen
+ strlen(s
));
while (*s
!= '\0') {
if (n
!= 1) {
*d
++ = *s
;
n
--;
}
s
++;
}
*d
= '\0';
return (dlen
+ (s
- src
)); /* count does not include NUL */
}
/*-------------------------------------------------------------------*/
#endif // STRLCPY_DEFINED