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141 lines
3.0 KiB
C
141 lines
3.0 KiB
C
/* $OpenBSD: dc.c,v 1.11 2009/10/27 23:59:37 deraadt Exp $ */
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/*
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* Copyright (c) 2003, Otto Moerbeek <otto@drijf.net>
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* Copyright (c) 2009, Gabor Kovesdan <gabor@FreeBSD.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/stat.h>
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <getopt.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "extern.h"
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#define DC_VER "1.3-FreeBSD"
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static void usage(void);
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extern char *__progname;
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static struct source src;
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static const struct option long_options[] =
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{
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{"expression", required_argument, NULL, 'e'},
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{"file", required_argument, NULL, 'f'},
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{"help", no_argument, NULL, 'h'},
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{"version", no_argument, NULL, 'V'}
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};
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static void
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usage(void)
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{
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fprintf(stderr, "usage: %s [-hVx] [-e expression] [file]\n",
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__progname);
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exit(1);
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}
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static void
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procfile(char *fname) {
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struct stat st;
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FILE *file;
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file = fopen(fname, "r");
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if (file == NULL)
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err(1, "cannot open file %s", fname);
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if (fstat(fileno(file), &st) == -1)
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err(1, "%s", fname);
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if (S_ISDIR(st.st_mode)) {
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errno = EISDIR;
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err(1, "%s", fname);
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}
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src_setstream(&src, file);
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reset_bmachine(&src);
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eval();
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fclose(file);
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}
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int
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main(int argc, char *argv[])
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{
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int ch;
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bool extended_regs = false, preproc_done = false;
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/* accept and ignore a single dash to be 4.4BSD dc(1) compatible */
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while ((ch = getopt_long(argc, argv, "e:f:hVx", long_options, NULL)) != -1) {
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switch (ch) {
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case 'e':
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if (!preproc_done)
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init_bmachine(extended_regs);
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src_setstring(&src, optarg);
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reset_bmachine(&src);
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eval();
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preproc_done = true;
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break;
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case 'f':
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if (!preproc_done)
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init_bmachine(extended_regs);
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procfile(optarg);
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preproc_done = true;
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break;
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case 'x':
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extended_regs = true;
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break;
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case 'V':
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fprintf(stderr, "%s (BSD bc) %s\n", __progname, DC_VER);
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exit(0);
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break;
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case '-':
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break;
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case 'h':
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/* FALLTHROUGH */
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default:
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usage();
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}
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}
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argc -= optind;
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argv += optind;
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if (!preproc_done)
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init_bmachine(extended_regs);
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setlinebuf(stdout);
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setlinebuf(stderr);
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if (argc > 1)
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usage();
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if (argc == 1) {
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procfile(argv[0]);
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preproc_done = true;
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}
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if (preproc_done)
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return (0);
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src_setstream(&src, stdin);
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reset_bmachine(&src);
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eval();
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return (0);
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}
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