65 lines
1.9 KiB
C++
65 lines
1.9 KiB
C++
/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2011, 2012.
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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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fwrite.cpp
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Writes data to a FILE.
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*******************************************************************************/
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#include <assert.h>
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#include <stdio.h>
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#include <errno.h>
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extern "C" size_t fwrite(const void* ptr, size_t size, size_t nmemb, FILE* fp)
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{
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if ( !fp->write_func )
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return errno = EBADF, 0;
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fp->flags &= ~_FILE_LAST_READ; fp->flags |= _FILE_LAST_WRITE;
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char* str = (char*) ptr;
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size_t total = size * nmemb;
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size_t sofar = 0;
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while ( sofar < total )
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{
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size_t left = total - sofar;
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if ( fp->flags & _FILE_NO_BUFFER || !fp->buffersize )
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{
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size_t ret = sofar + fp->write_func(str + sofar, 1, left, fp->user);
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return ret;
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}
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size_t available = fp->buffersize - fp->bufferused;
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if ( !available )
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{
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if ( fflush(fp) == 0 ) continue;
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else return sofar;
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}
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size_t count = available < left ? available : left;
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for ( size_t i = 0; i < count; i++ )
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{
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char c = str[sofar++];
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fp->buffer[fp->bufferused++] = c;
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assert(fp->bufferused <= fp->buffersize);
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if ( c == '\n' || fp->buffersize == fp->bufferused )
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break;
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}
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}
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return sofar;
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}
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