46 lines
1.7 KiB
C++
46 lines
1.7 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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fread.cpp
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Reads data from a FILE.
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*******************************************************************************/
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#include <stdio.h>
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#include <errno.h>
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extern "C" size_t fread(void* ptr, size_t size, size_t nmemb, FILE* fp)
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{
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if ( fp->numpushedback && size != 1 ) { errno = ENOSYS; return 0; }
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if ( fp->numpushedback && nmemb )
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{
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unsigned char* buf = (unsigned char*) ptr;
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size_t amount = nmemb < fp->numpushedback ? nmemb : fp->numpushedback;
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for ( size_t i = 0; i < amount; i++ )
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{
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buf[i] = fp->pushedback[--(fp->numpushedback)];
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}
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if ( nmemb <= amount ) { return nmemb; }
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return amount + fread(buf + amount, size, nmemb - amount, fp);
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}
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if ( !fp->read_func ) { errno = EBADF; return 0; }
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fp->flags &= ~_FILE_LAST_WRITE; fp->flags |= _FILE_LAST_READ;
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return fp->read_func(ptr, size, nmemb, fp->user);
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}
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