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dc.c

/* 
 * implement the "dc" Desk Calculator language.
 *
 * Copyright (C) 1994, 1997, 1998, 2000 Free Software Foundation, Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, you can either send email to this
 * program's author (see below) or write to:
 *   The Free Software Foundation, Inc.
 *   59 Temple Place, Suite 330
 *   Boston, MA 02111 USA
 */

/* Written with strong hiding of implementation details
 * in their own specialized modules.
 */
/* This module contains the argument processing/main functions.
 */

#include "config.h"

#include <stdio.h>
#ifdef HAVE_STDLIB_H
# include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
# include <string.h>
#else
# ifdef HAVE_STRINGS_H
#  include <strings.h>
# endif
#endif
#include <getopt.h>
#include "dc.h"
#include "dc-proto.h"

#ifndef EXIT_SUCCESS    /* C89 <stdlib.h> */
# define EXIT_SUCCESS   0
#endif
#ifndef EXIT_FAILURE    /* C89 <stdlib.h> */
# define EXIT_FAILURE   1
#endif

const char *progname;   /* basename of program invocation */

static void
bug_report_info DC_DECLVOID()
{
      printf("Email bug reports to:  bug-dc@gnu.org .\n");
}

static void
show_version DC_DECLVOID()
{
      printf("dc (GNU %s %s) %s\n", PACKAGE, VERSION, DC_VERSION);
      printf("\n%s\n\
This is free software; see the source for copying conditions.  There is NO\n\
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE,\n\
to the extent permitted by law.\n", DC_COPYRIGHT); 
}

/* your generic usage function */
static void
usage DC_DECLARG((f))
      FILE *f DC_DECLEND
{
      fprintf(f, "\
Usage: %s [OPTION] [file ...]\n\
  -e, --expression=EXPR    evaluate expression\n\
  -f, --file=FILE          evaluate contents of file\n\
  -h, --help               display this help and exit\n\
  -V, --version            output version information and exit\n\
\n\
", progname);
      bug_report_info();
}

/* returns a pointer to one past the last occurance of c in s,
 * or s if c does not occur in s.
 */
static char *
r1bindex DC_DECLARG((s, c))
      char *s DC_DECLSEP
      int  c DC_DECLEND
{
      char *p = strrchr(s, c);

      if (!p)
            return s;
      return p + 1;
}

static void
try_file(const char *filename)
{
      FILE *input;

      if (strcmp(filename, "-") == 0) {
            input = stdin;
      } else if ( !(input=fopen(filename, "r")) ) {
            fprintf(stderr, "Could not open file ");
            perror(filename);
            exit(EXIT_FAILURE);
      }
      if (dc_evalfile(input))
            exit(EXIT_FAILURE);
      if (input != stdin)
            fclose(input);
}


int
main DC_DECLARG((argc, argv))
      int  argc DC_DECLSEP
      char **argv DC_DECLEND
{
      static struct option const long_opts[] = {
            {"expression", required_argument, NULL, 'e'},
            {"file", required_argument, NULL, 'f'},
            {"help", no_argument, NULL, 'h'},
            {"version", no_argument, NULL, 'V'},
            {NULL, 0, NULL, 0}
      };
      int did_eval = 0;
      int c;

      progname = r1bindex(*argv, '/');
#ifdef HAVE_SETVBUF
      /* attempt to simplify interaction with applications such as emacs */
      (void) setvbuf(stdout, NULL, _IOLBF, 0);
#endif
      dc_math_init();
      dc_string_init();
      dc_register_init();
      dc_array_init();

      while ((c = getopt_long(argc, argv, "hVe:f:", long_opts, (int *)0)) != EOF) {
            switch (c) {
            case 'e':
                  {     dc_data string = dc_makestring(optarg, strlen(optarg));
                        if (dc_evalstr(string))
                              return EXIT_SUCCESS;
                        dc_free_str(&string.v.string);
                        did_eval = 1;
                  }
                  break;
            case 'f':
                  try_file(optarg);
                  did_eval = 1;
                  break;
            case 'h':
                  usage(stdout);
                  return EXIT_SUCCESS;
            case 'V':
                  show_version();
                  return EXIT_SUCCESS;
            default:
                  usage(stderr);
                  return EXIT_FAILURE;
            }
      }

      for (; optind < argc; ++optind) {
            try_file(argv[optind]);
            did_eval = 1;
      }
      if (!did_eval) {
            /* if no -e commands and no command files, then eval stdin */
            if (dc_evalfile(stdin))
                  return EXIT_FAILURE;
      }
      return EXIT_SUCCESS;
}

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