70 lines
2.1 KiB
C
70 lines
2.1 KiB
C
/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2013, 2014, 2015.
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This file is part of the Sortix C Library.
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The Sortix C Library is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 3 of the License, or (at your
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option) any later version.
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The Sortix C Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
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stdlib/mkostemps.c
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Make a unique temporary file path and open it.
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*******************************************************************************/
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#include <errno.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <string.h>
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static const uint32_t NUM_CHARACTERS = 10 + 26 + 26;
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static inline char random_character(void)
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{
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uint32_t index = arc4random_uniform(NUM_CHARACTERS);
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if ( index < 10 )
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return '0' + index;
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if ( index < 10 + 26 )
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return 'a' + index - 10;
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if ( index < 10 + 26 + 26 )
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return 'A' + index - (10 + 26);
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__builtin_unreachable();
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}
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int mkostemps(char* templ, int suffixlen, int flags)
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{
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size_t templ_length = strlen(templ);
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if ( templ_length < 6 ||
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suffixlen < 0 ||
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templ_length - 6 < (size_t) suffixlen )
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return errno = EINVAL, -1;
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size_t xpos = templ_length - (6 + suffixlen);
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for ( size_t i = 0; i < 6; i++ )
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if ( templ[xpos + i] != 'X' )
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return errno = EINVAL, -1;
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flags &= ~O_ACCMODE;
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do
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{
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for ( size_t i = 0; i < 6; i++ )
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templ[xpos + i] = random_character();
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int fd = open(templ, flags | O_RDWR | O_EXCL | O_CREAT, 0600);
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if ( 0 <= fd )
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return fd;
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} while ( errno == EEXIST );
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memcpy(templ + xpos, "XXXXXX", 6);
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return -1;
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}
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