123456789101112131415161718192021222324252627282930313233343536373839404142434445 |
- /*
- * pANS stdio -- fread
- */
- #include "iolib.h"
- #include <string.h>
- #define BIGN (BUFSIZ/2)
- size_t fread(void *p, size_t recl, size_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;
- memcpy(s, f->rp, d);
- f->rp+=d;
- }else{
- if(n >= BIGN && f->state==RD && !(f->flags&STRING) && f->buf!=f->unbuf){
- d=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:
- if(recl)
- return (s-(char*)p)/recl;
- else
- return s-(char*)p;
- }
|