last few day's work

[unix-history] / usr / src / usr.bin / pascal / libpc / READ8.c

/* Copyright (c) 1979 Regents of the University of California */

static char sccsid[] = "@(#)READ8.c 1.5 %G%";

#include "h00vars.h"
#include <errno.h>
extern int errno;

double
READ8(curfile)

       register struct iorec   *curfile;
{
       double                  data;
       int                     retval;

       if (curfile->funit & FWRITE) {
               ERROR("%s: Attempt to read, but open for writing\n",
                       curfile->pfname);
               return;
       }
       UNSYNC(curfile);
       errno = 0;
       retval = fscanf(curfile->fbuf, "%lf", &data);
       if (retval == EOF) {
               ERROR("%s: Tried to read past end of file\n", curfile->pfname);
               return;
       }
       if (retval == 0) {
               ERROR("%s: Bad data found on real read\n", curfile->pfname);
               return;
       }
       if (errno == ERANGE) {
               if (data == 0.0)
                       ERROR("%s: Underflow on real read\n", curfile->pfname);
               else
                       ERROR("%s: Overflow on real read\n", curfile->pfname);
               return;
       }
       if (errno != 0) {
               PERROR(curfile->pfname);
               return;
       }
       curfile->funit &= ~EOLN;
       curfile->funit |= SYNC;
       return data;
}