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