source: buchla-68k/orig/GEMDOS/CURVER.C

/*
   =============================================================================
        curver.c -- read and print a GEMDOS version message object file
        Version 1 -- 1988-11-03  -- D.N. Lynx Crowe
        (c) Copyright 1988 -- D.N. Lynx Crowe -- All rights reserved

        Compiled and linked with the GEMDOS Alcyon C developer's package.

        NOTE:  Because we use the Alcyon GEMDOS object file format,
        which is specific to the Atari,  this code is NON-PORTABLE.

        The idea, however, is adaptable to a wide variety of systems
        and object file formats.
   =============================================================================
*/

#include "stdio.h"              /* Atari GEMDOS standard I/O definitions */
#include "stddefs.h"            /* some usefull standard C definitions */
#include "objdefs.h"            /* GEMDOS object file definitions */

#define VERFILE         "verdate.o"     /* version message file */

extern  int     errno;  /* system error code */

FILE    *fp;            /* VERFILE file pointer */

struct vb {             /* VERFILE buffer (66 bytes) */

        struct EXFILE   hdr;
        char            ver[12];
        struct SYMBOL   sym;
        char            rem[12];

} verbuf;

/* 

*/
        
/*
   =============================================================================
        read and print an Alcyon/GEMDOS format version message object file
   =============================================================================
*/

main()
{
        short   len, rc;

        len = sizeof verbuf;

        /* first, read the version message object file */

        if ((FILE *)NULL EQ (fp = fopenb(VERFILE, "r"))) {

                printf("ERROR -- Unable to open \"%s\" for reading  (errno = %d)\n",
                        VERFILE, errno);

                exit(1);
        }

        rewind(fp);

        if (1 NE (rc = fread(&verbuf, len, 1, fp))) {

                printf("ERROR -- Unable to read \"%s\"  (rc = %d, errno = %d)\n",
                        VERFILE, rc, errno);

                if (ferror(fp))
                        printf("  File system ERROR.\n");
                else if (feof(fp))
                        printf("  Premature EOF.\n");
                else
                        printf("  Neither ERROR or EOF set -- very odd\n");

                fclose(fp);
                exit(1);
        }

        /* close the file, print the version message, and exit */

        fclose(fp);
        printf("Current version:  %s\n", verbuf.ver);
        exit(0);
}