/*

* tiny_initramfs - Minimalistic initramfs implementation

* Copyright (C) 2016 Christian Seiler <[email protected]>

*

* util.c: Misc helper functions

*

* This program 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.

*

* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.

*/

#include "tiny_initramfs.h"

#include <stdarg.h>

#include <string.h>

static void append_to_buf_v(char *buf, size_t size, va_list ap)

{

const char *ptr;

size_t remaining_size;

if (strlen(buf) > size)

return;

remaining_size = size - strlen(buf);

for (ptr = va_arg(ap, const char *); ptr; ptr = va_arg(ap, const char *)) {

strncat(buf, ptr, remaining_size - 1);

/* Make sure it's NUL-terminated. */

if (strlen(ptr) >= remaining_size - 1) {

buf[size - 1] = '\0';

break;

}

remaining_size -= strlen(ptr);

}

}

void append_to_buf(char *buf, size_t size, ...)

{

va_list ap;

va_start(ap, size);

append_to_buf_v(buf, size, ap);

va_end(ap);

}

void set_buf(char *buf, size_t size, ...)

{

va_list ap;

va_start(ap, size);

memset(buf, 0, size);

append_to_buf_v(buf, size, ap);

va_end(ap);

}