51 lines
1.0 KiB
C
51 lines
1.0 KiB
C
/*
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* This file is part of the UCB release of Plan 9. It is subject to the license
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* terms in the LICENSE file found in the top-level directory of this
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* distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
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* part of the UCB release of Plan 9, including this file, may be copied,
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* modified, propagated, or distributed except according to the terms contained
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* in the LICENSE file.
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*/
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/*
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* pANS stdio -- fread
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*/
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#include "iolib.h"
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#define BIGN (BUFSIZ/2)
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int32_t fread(void *p, int32_t recl, int32_t nrec, FILE *f){
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char *s;
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int n, d, c;
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s=(char *)p;
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n=recl*nrec;
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while(n>0){
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d=f->wp-f->rp;
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if(d>0){
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if(d>n)
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d=n;
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memmove(s, f->rp, d);
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f->rp+=d;
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}else{
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if(n >= BIGN && f->state==RD && !(f->flags&STRING) && f->buf!=f->unbuf){
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d=jehanne_read(f->fd, s, n);
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if(d<=0){
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f->state=(d==0)?END:ERR;
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goto ret;
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}
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}else{
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c=_IO_getc(f);
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if(c==EOF)
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goto ret;
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*s=c;
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d=1;
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}
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}
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s+=d;
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n-=d;
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}
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ret:
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return (s-(char *)p)/(recl?recl:1);
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}
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