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/* SPDX-License-Identifier: LGPL-2.1+ */
/***
This file is part of systemd.
Copyright 2013 Kay Sievers
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
/*
* Concatenates/copies strings. In any case, terminates in all cases
* with '\0' and moves the @dest pointer forward to the added '\0'.
* Returns the remaining size, and 0 if the string was truncated.
*
* Due to the intended usage, these helpers silently noop invocations
* having zero size. This is technically an exception to the above
* statement "terminates in all cases". It's unexpected for such calls to
* occur outside of a loop where this is the preferred behavior.
*/
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include "strxcpyx.h"
size_t strpcpy(char **dest, size_t size, const char *src) {
size_t len;
assert(dest);
assert(src);
if (size == 0)
return 0;
len = strlen(src);
if (len >= size) {
if (size > 1)
*dest = mempcpy(*dest, src, size-1);
size = 0;
} else {
if (len > 0) {
*dest = mempcpy(*dest, src, len);
size -= len;
}
}
*dest[0] = '\0';
return size;
}
size_t strpcpyf(char **dest, size_t size, const char *src, ...) {
va_list va;
int i;
assert(dest);
assert(src);
if (size == 0)
return 0;
va_start(va, src);
i = vsnprintf(*dest, size, src, va);
if (i < (int)size) {
*dest += i;
size -= i;
} else {
size = 0;
}
va_end(va);
return size;
}
size_t strpcpyl(char **dest, size_t size, const char *src, ...) {
va_list va;
assert(dest);
assert(src);
va_start(va, src);
do {
size = strpcpy(dest, size, src);
src = va_arg(va, char *);
} while (src != NULL);
va_end(va);
return size;
}
size_t strscpy(char *dest, size_t size, const char *src) {
char *s;
assert(dest);
assert(src);
s = dest;
return strpcpy(&s, size, src);
}
size_t strscpyl(char *dest, size_t size, const char *src, ...) {
va_list va;
char *s;
assert(dest);
assert(src);
va_start(va, src);
s = dest;
do {
size = strpcpy(&s, size, src);
src = va_arg(va, char *);
} while (src != NULL);
va_end(va);
return size;
}
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