51 lines
787 B
C
51 lines
787 B
C
#include <u.h>
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#include <libc.h>
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#include <bio.h>
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long
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Bread(Biobufhdr *bp, void *ap, long count)
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{
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long c;
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uchar *p;
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int i, n, ic;
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p = ap;
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c = count;
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ic = bp->icount;
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while(c > 0) {
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n = -ic;
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if(n > c)
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n = c;
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if(n == 0) {
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if(bp->state != Bractive)
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break;
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i = bp->iof(bp, bp->bbuf, bp->bsize);
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if(i <= 0) {
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bp->state = Bracteof;
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if(i < 0) {
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Berror(bp, "read error: %r");
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bp->state = Binactive;
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}
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break;
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}
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bp->gbuf = bp->bbuf;
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bp->offset += i;
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if(i < bp->bsize) {
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memmove(bp->ebuf-i, bp->bbuf, i);
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bp->gbuf = bp->ebuf-i;
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}
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ic = -i;
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continue;
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}
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memmove(p, bp->ebuf+ic, n);
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c -= n;
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ic += n;
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p += n;
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}
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bp->icount = ic;
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if(count == c && bp->state == Binactive)
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return -1;
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return count-c;
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}
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