49 lines
1.5 KiB
C++
49 lines
1.5 KiB
C++
/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2013.
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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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unistd/getlogin.cpp
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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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extern "C" char* getlogin()
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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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