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Add mkostemps(3) family.

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This commit is contained in:
Jonas 'Sortie' Termansen 2015-02-06 16:03:24 +01:00
parent 472bba3db3
commit f0e3e2cfef
6 changed files with 136 additions and 37 deletions
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3
libc/Makefile
View file

@ -450,7 +450,10 @@ stdlib/clearenv.o \
stdlib/_Exit.o \
stdlib/exit.o \
stdlib/getenv.o \
stdlib/mkostemp.o \
stdlib/mkostemps.o \
stdlib/mkstemp.o \
stdlib/mkstemps.o \
stdlib/mktemp.o \
stdlib/on_exit.o \
stdlib/rand.o \

5
libc/include/stdlib.h
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@ -1,6 +1,6 @@
/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2013, 2014.
Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2013, 2014, 2015.
This file is part of the Sortix C Library.
@ -105,7 +105,10 @@ void* malloc(size_t);
int mblen(const char*, size_t);
size_t mbstowcs(wchar_t* __restrict, const char* __restrict, size_t);
int mbtowc(wchar_t *__restrict, const char* __restrict, size_t);
int mkostemp(char*, int);
int mkostemps(char*, int, int);
int mkstemp(char*);
int mkstemps(char*, int);
#if !defined(__is_sortix_libc) /* not a warning inside libc */
__attribute__((__warning__("mktemp() is racy, use mkstemp()")))
#endif

30
libc/stdlib/mkostemp.cpp Normal file
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@ -0,0 +1,30 @@
/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2015.
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/mkostemp.cpp
Make a unique temporary file path and open it.
*******************************************************************************/
#include <stdlib.h>
extern "C" int mkostemp(char* templ, int flags)
{
return mkostemps(templ, 0, flags);
}

66
libc/stdlib/mkostemps.cpp Normal file
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@ -0,0 +1,66 @@
/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2013, 2014, 2015.
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/mkostemps.cpp
Make a unique temporary file path and open it.
*******************************************************************************/
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
const uint32_t NUM_CHARACTERS = 10 + 26 + 26;
static inline char random_character()
{
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();
}
extern "C" 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;
int fd;
do
{
for ( size_t i = 0; i < 6; i++ )
templ[xpos + i] = random_character();
} while ( (fd = open(templ, flags | O_RDWR | O_EXCL | O_CREAT, 0600)) < 0 &&
(errno == EEXIST) );
return fd;
}

39
libc/stdlib/mkstemp.cpp
View file

@ -1,6 +1,6 @@
/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2013, 2014.
Copyright(C) Jonas 'Sortie' Termansen 2013, 2014, 2015.
This file is part of the Sortix C Library.
@ -18,46 +18,13 @@
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.
Make a unique temporary file path and open 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;
return mkostemps(templ, 0, 0);
}

30
libc/stdlib/mkstemps.cpp Normal file
View file

@ -0,0 +1,30 @@
/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2015.
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/mkstemps.cpp
Make a unique temporary file path and open it.
*******************************************************************************/
#include <stdlib.h>
extern "C" int mkstemps(char* templ, int suffixlen)
{
return mkostemps(templ, suffixlen, 0);
}