47 lines
1005 B
C
47 lines
1005 B
C
#include <stdio.h>
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#include <string.h>
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#include "fileutil.h"
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size_t fread(void *data, size_t membsize, size_t nmemb, FILE *fp)
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{
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size_t size;
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if(__builtin_umul_overflow(membsize, nmemb, &size)) {
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fp->error = 1;
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return 0;
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}
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if(!fp->buf) {
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ssize_t rc = __fp_read(fp, data, size);
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return (rc == EOF) ? 0 : rc;
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}
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__fp_buffer_mode_read(fp);
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size_t size_read = 0;
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while(size_read < size) {
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/* Take what's available in the buffer (may be 0, but only
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during the first iteration) */
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size_t size_frag = fp->bufread - fp->bufpos;
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if(size_frag > size - size_read)
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size_frag = size - size_read;
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memcpy(data + size_read, fp->buf + fp->bufpos, size_frag);
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size_read += size_frag;
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fp->bufpos += size_frag;
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if(fp->bufpos >= fp->bufread) {
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fp->bufread = 0;
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fp->bufpos = 0;
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}
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if(size_read >= size)
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break;
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/* Get more data */
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ssize_t rc = __fp_read(fp, fp->buf, fp->bufsize);
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if(rc <= 0) /* EOF or error */
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break;
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fp->bufread = rc;
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}
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return size_read;
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}
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