Subversion Repositories planix.SVN

/*
 * 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);
}