source: buchla-68k/orig/IOLIB/FLREAD.C@ 0170798

/*
   ============================================================================
        flread.c -- read a long buffer
        Version 2 -- 1987-07-09 -- D.N. Lynx Crowe
   ============================================================================
*/

#include "stdio.h"
#include "stddefs.h"

#define CHUNK   32256           /* largest practical sized chunk of data */

/*
   ============================================================================
        flread(buff, len, fp) -- Reads 'len' bytes into 'buff' from file 'fp'.

        Returns SUCCESS (0) if OK, EOF (-1) on end of file.
   ============================================================================
*/

int
flread(buff, len, fp)
register char *buff;
register long len;
FILE *fp;
{
        register int    ilen;

        while (len > 0L) {

                if (len GE (long)CHUNK) {

                        if (1 NE fread(buff, CHUNK, 1, fp))
                                return(EOF);

                        buff += (long)CHUNK;
                        len -= (long)CHUNK;

                } else {

                        ilen = len;

                        if (1 NE fread(buff, ilen, 1, fp))
                                return(EOF);

                        len = 0L;
                }
        }

        return(SUCCESS);
}