/**
* slibc — Yet another C library
* Copyright © 2015, 2016 Mattias Andrée (maandree@member.fsf.org)
*
* 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 <string.h>
/**
* Copy a memory segment to another, possibly overlapping, segment,
* stop when a NUL byte is encountered.
*
* This is a slibc extension added for completeness.
* It is only available if GNU extensions are available.
*
* @param whither The destination memory segment.
* @param whence The source memory segment.
* @param maxlen The maximum number of bytes to copy.
* NOTE that if the resulting string at least this
* long, no NUL byte will be written to `whither'.
* On the otherhand, if the resultnig string is
* shorter, `whither` will be filled with NUL bytes
* until this amount of bytes have been written.
* @return `whither` plus the number of written bytes,
* excluding NUL bytes, is returned.
*
* @since Always.
*/
char* stpnmove(char* whither, const char* whence, size_t maxlen)
{
size_t n = strnlen(whence, maxlen);
memmove(whither, whence, n);
memset(whither + n, 0, maxlen - n);
return whither + n;
}
