63 lines
1.8 KiB
C
63 lines
1.8 KiB
C
/*
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* Copyright (c) 2013, 2014, 2015, 2018 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* stdlib/mkdtemps.c
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* Make a unique temporary directory path and create it.
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*/
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#include <sys/stat.h>
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#include <errno.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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char* mkdtemps(char* templ, size_t suffixlen)
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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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templ_length - 6 < (size_t) suffixlen )
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return errno = EINVAL, (char*) NULL;
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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, (char*) NULL;
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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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if ( mkdir(templ, 0700) == 0 )
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return templ;
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} while ( errno == EEXIST );
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memcpy(templ + xpos, "XXXXXX", 6);
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return NULL;
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}
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