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#include "stdio_impl.h"
#define MIN(a,b) ((a)<(b) ? (a) : (b))
size_t fread(void *destv, size_t size, size_t nmemb, FILE *f)
{
unsigned char *dest = destv;
size_t len = size*nmemb, l = len, k;
/* Never touch the file if length is zero.. */
if (!l) return 0;
FLOCK(f);
for (;;) {
/* First exhaust the buffer. */
k = MIN(f->rend - f->rpos, l);
memcpy(dest, f->rpos, k);
f->rpos += k;
dest += k;
l -= k;
/* Stop on EOF or errors */
if (f->flags & (F_EOF|F_ERR|F_NORD)) goto eof;
/* Done? Or going unbuffered? */
if (!l || l > f->buf_size/2) break;
/* Otherwise, refill & read thru buffer. */
__underflow(f);
}
/* Read the remainder directly */
for (; l; l-=k, dest+=k) {
k = f->read(f, dest, l);
if (k+1<=1) {
f->flags |= F_EOF | (F_ERR & k);
goto eof;
}
}
FUNLOCK(f);
return nmemb;
eof:
FUNLOCK(f);
return (len-l)/size;
}
weak_alias(fread, fread_unlocked);
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