42 lines
609 B
C
42 lines
609 B
C
/*
|
|
* pANS stdio -- fread
|
|
*/
|
|
#include "iolib.h"
|
|
|
|
#define BIGN (BUFSIZ/2)
|
|
|
|
long fread(void *p, long recl, long 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=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);
|
|
}
|