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SVN revision: 1349
This commit is contained in:
Stefan Ritt 2005-05-09 07:50:06 +00:00
parent 9bd93c0ac0
commit 19d0aa9a1b
2 changed files with 0 additions and 99 deletions
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83
src/strlcpy.c
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/********************************************************************\
Name: strlcpy.c
Created by: Stefan Ritt
Contents: Contains strlcpy and strlcat which are versions of
strcpy and strcat, but which avoid buffer overflows
$Log$
Revision 1.1 2005/05/02 10:19:12 ritt
Initial revision
\********************************************************************/
#include <stdio.h>
#include <string.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.
*/
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 */
}
/*-------------------------------------------------------------------*/

16
src/strlcpy.h
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/********************************************************************\
Name: strlcpy.h
Created by: Stefan Ritt
Contents: Header file for strlcpy.c
$Log$
Revision 1.1 2005/05/02 10:20:33 ritt
Initial revision
\********************************************************************/
size_t strlcpy(char *dst, const char *src, size_t size);
size_t strlcat(char *dst, const char *src, size_t size);