44 lines
1.4 KiB
C
44 lines
1.4 KiB
C
/*
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* Copyright (c) 2013 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/getlogin.c
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* Get name of user logged in at the controlling 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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#include <string.h>
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char* getlogin(void)
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{
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static char* buffer = NULL;
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static size_t buffer_size = 0;
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int ret;
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while ( !buffer_size ||
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((ret = getlogin_r(buffer, buffer_size)) < 0 && errno == ERANGE) )
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{
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size_t new_buffer_size = buffer_size ? buffer_size * 2 : 64;
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char* new_buffer = (char*) realloc(buffer, new_buffer_size);
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if ( !new_buffer )
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return NULL;
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buffer = new_buffer;
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buffer_size = new_buffer_size;
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}
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return ret == 0 ? buffer : NULL;
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}
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