65 lines
1.9 KiB
C
65 lines
1.9 KiB
C
/*
|
|
* Copyright (c) 2013, 2014, 2015 Jonas 'Sortie' Termansen.
|
|
*
|
|
* Permission to use, copy, modify, and distribute this software for any
|
|
* purpose with or without fee is hereby granted, provided that the above
|
|
* copyright notice and this permission notice appear in all copies.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
|
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
|
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
|
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
|
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
|
|
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
|
*
|
|
* stdlib/mkostemps.c
|
|
* Make a unique temporary file path and open it.
|
|
*/
|
|
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
static const uint32_t NUM_CHARACTERS = 10 + 26 + 26;
|
|
|
|
static inline char random_character(void)
|
|
{
|
|
uint32_t index = arc4random_uniform(NUM_CHARACTERS);
|
|
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();
|
|
}
|
|
|
|
int mkostemps(char* templ, int suffixlen, int flags)
|
|
{
|
|
size_t templ_length = strlen(templ);
|
|
if ( templ_length < 6 ||
|
|
suffixlen < 0 ||
|
|
templ_length - 6 < (size_t) suffixlen )
|
|
return errno = EINVAL, -1;
|
|
size_t xpos = templ_length - (6 + suffixlen);
|
|
for ( size_t i = 0; i < 6; i++ )
|
|
if ( templ[xpos + i] != 'X' )
|
|
return errno = EINVAL, -1;
|
|
|
|
flags &= ~O_ACCMODE;
|
|
do
|
|
{
|
|
for ( size_t i = 0; i < 6; i++ )
|
|
templ[xpos + i] = random_character();
|
|
int fd = open(templ, flags | O_RDWR | O_EXCL | O_CREAT, 0600);
|
|
if ( 0 <= fd )
|
|
return fd;
|
|
} while ( errno == EEXIST );
|
|
|
|
memcpy(templ + xpos, "XXXXXX", 6);
|
|
|
|
return -1;
|
|
}
|