Xref:	news2.mv.net comp.os.msdos.djgpp:8510
From:	John Moon <moon2 AT ccfsun DOT nrl DOT navy DOT mil>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Binary files and ^C chars-try again
Date:	Wed, 11 Sep 1996 11:21:33 -0700
Organization:	Naval Research Lab
Lines:	63
Message-ID:	<3237032D.258A@ccfsun.nrl.navy.mil>
NNTP-Posting-Host:	jamoon.nrl.navy.mil
Mime-Version:	1.0
CC:	moon2 AT ccfsun DOT nrl DOT navy DOT mil
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

Let's try this again,

This may be a dumb question, but
when I try to read a ^C char in binary from a 
file I get an EOF condition, no matter if I try
to read further into the file or not. Is this a
perversity of the djgpp stdlib? If so, what is the
standard work-around? I have tried getc, fgetc, 
fscanf, and fread, and they all do the same thing.
Apparently, the 255 (EOF) char does the same thing so
even if I get the file size and fseek past the
offending character I don't know whether it was a
^C or EOF.

I am using go32 v 1.12.maint3

Thanks for dispelling my ignorance,

John Moon

PS Here's the code-it's only a few lines

#include <stdio.h>
#include <math.h>

#define MAX 300

main(argc,argv)
    int argc;
    char *argv[];
{


    FILE *fp,*fopen();
    long i=0,lala;
    int c,j;
    char buf[255];

/* this creates a test binary file 0-255 named w/ contents of argv[1] */

    if((fp=fopen(argv[1],"w"))!=NULL) {
        for(i=0; i < 256; ++i) fputc((char)i,fp);
        fclose(fp);
    }        

/* this attempts to read it back */

    if((fp=fopen(argv[1],"r"))!=NULL) {
         fseek(fp,0L,SEEK_END);
         lala=ftell(fp);
         printf("\n\n\nFile Size = %ld\n",lala);
         rewind(fp); 
         for(i=0; i < MAX; ++i) {
          j=fread(buf,(size_t)1,(size_t)1,fp);
          printf("%ld %d %d",i,j,buf[0]);
          printf("\n");
        }          
    }
    else fprintf(stderr,"cant open %s\n",argv[1]);

    exit(0);

}

- Raw text -