80 lines
2.4 KiB
C
80 lines
2.4 KiB
C
/*
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* Copyright (c) 2011, 2012, 2013, 2014, 2015 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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* stdio/fread_unlocked.c
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* Reads data from a FILE.
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*/
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#include <sys/types.h>
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#include <errno.h>
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#include <limits.h>
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#include <stdint.h>
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#include <stdio.h>
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size_t fread_unlocked(void* ptr,
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size_t element_size,
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size_t num_elements,
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FILE* fp)
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{
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if ( !(fp->flags & _FILE_READABLE) )
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return errno = EBADF, fp->flags |= _FILE_STATUS_ERROR, EOF;
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unsigned char* buf = (unsigned char*) ptr;
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size_t count = element_size * num_elements;
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if ( count == 0 )
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return num_elements;
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if ( fp->buffer_mode == _IONBF )
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{
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if ( !(fp->flags & _FILE_BUFFER_MODE_SET) )
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setvbuf_unlocked(fp, NULL, fp->buffer_mode, 0);
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if ( !fp->read_func )
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return errno = EBADF, fp->flags |= _FILE_STATUS_ERROR, 0;
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if ( fp->flags & _FILE_LAST_WRITE )
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fflush_stop_writing_unlocked(fp);
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fp->flags |= _FILE_LAST_READ;
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fp->flags &= ~_FILE_STATUS_EOF;
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size_t sofar = 0;
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while ( sofar < count )
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{
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size_t request = count - sofar;
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if ( (size_t) SSIZE_MAX < request )
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request = SSIZE_MAX;
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ssize_t amount = fp->read_func(fp->user, buf + sofar, request);
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if ( amount < 0 )
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return fp->flags |= _FILE_STATUS_ERROR, sofar / num_elements;
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if ( amount == 0 )
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return fp->flags |= _FILE_STATUS_EOF, sofar / num_elements;
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sofar += amount;
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}
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return sofar / element_size;
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}
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for ( size_t n = 0; n < num_elements; n++ )
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{
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size_t offset = n * element_size;
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for ( size_t i = 0; i < element_size; i++ )
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{
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int c = fgetc_unlocked(fp);
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if ( c == EOF )
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return n;
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buf[offset + i] = (unsigned char) c;
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}
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}
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return num_elements;
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}
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