41 lines
1.3 KiB
C
41 lines
1.3 KiB
C
/*
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* Copyright (c) 2013, 2014 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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* unistd/ttyname.c
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* Returns the pathname of a terminal.
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*/
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#include <errno.h>
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#include <stdlib.h>
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#include <unistd.h>
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char* ttyname(int fd)
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{
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static char* result = NULL;
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static size_t result_size = 0;
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while ( ttyname_r(fd, result, result_size) < 0 )
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{
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if ( errno != ERANGE )
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return NULL;
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size_t new_result_size = result_size ? 2 * result_size : 16;
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char* new_result = (char*) realloc(result, new_result_size);
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if ( !new_result )
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return NULL;
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result = new_result;
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result_size = new_result_size;
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}
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return result;
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}
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