ref: 5c448c618a89ab8933838da1b5b97ed7c4a42e08
dir: /sys/src/ape/lib/ap/stdio/fread.c/
/* * 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 && f->state!=CLOSED){ d=f->wp-f->rp; if(d>0){ if(d>n) d=n; memcpy(s, f->rp, d); f->rp+=d; }else{ if(f->buf==f->unbuf || (n >= BIGN && f->state==RD && !(f->flags&STRING))){ d=read(f->fd, s, n); if(d<=0){ if(f->state!=CLOSED) 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; }