mirror of
https://gitlab.com/sortix/sortix.git
synced 2023-02-13 20:55:38 -05:00
63 lines
1.9 KiB
C++
63 lines
1.9 KiB
C++
/*******************************************************************************
|
|
|
|
Copyright(C) Jonas 'Sortie' Termansen 2013, 2014.
|
|
|
|
This file is part of the Sortix C Library.
|
|
|
|
The Sortix C Library 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 3 of the License, or (at your
|
|
option) any later version.
|
|
|
|
The Sortix C 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 Lesser General Public
|
|
License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public License
|
|
along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
stdlib/mkstemp.cpp
|
|
Make a unique temporary filepath and opens it.
|
|
|
|
*******************************************************************************/
|
|
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
const uint32_t NUM_CHARACTERS = 10 + 26 + 26;
|
|
|
|
static inline char get_character(uint32_t index)
|
|
{
|
|
if ( index < 10 )
|
|
return '0' + index;
|
|
if ( index < 10 + 26 )
|
|
return 'a' + index - 10;
|
|
if ( index < 10 + 26 + 26 )
|
|
return 'A' + index - (10 + 26);
|
|
__builtin_unreachable();
|
|
}
|
|
|
|
extern "C" int mkstemp(char* templ)
|
|
{
|
|
size_t templ_length = strlen(templ);
|
|
for ( size_t i = 0; i < 6; i++ )
|
|
{
|
|
if ( templ_length - i == 0 )
|
|
return errno = EINVAL, -1;
|
|
if ( templ[templ_length - i - 1] != 'X' )
|
|
return errno = EINVAL, -1;
|
|
}
|
|
|
|
int fd;
|
|
do
|
|
{
|
|
for ( size_t i = templ_length - 6; i < templ_length; i++ )
|
|
templ[i] = get_character(arc4random_uniform(NUM_CHARACTERS));
|
|
} while ( (fd = open(templ, O_RDWR | O_EXCL | O_CREAT, 0600)) < 0 &&
|
|
(errno == EEXIST) );
|
|
|
|
return fd;
|
|
}
|