dc.c revision 203443 
1/*	$OpenBSD: dc.c,v 1.11 2009/10/27 23:59:37 deraadt Exp $	*/
2
3/*
4 * Copyright (c) 2003, Otto Moerbeek <otto@drijf.net>
5 * Copyright (c) 2009, Gabor Kovesdan <gabor@FreeBSD.org>
6 *
7 * Permission to use, copy, modify, and distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
10 *
11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18 */
19
20#include <sys/cdefs.h>
21__FBSDID("$FreeBSD: head/usr.bin/dc/dc.c 203443 2010-02-03 21:06:13Z gabor $");
22
23#include <sys/stat.h>
24
25#include <ctype.h>
26#include <err.h>
27#include <errno.h>
28#include <getopt.h>
29#include <stdio.h>
30#include <stdlib.h>
31#include <string.h>
32#include <unistd.h>
33
34#include "extern.h"
35
36#define	DC_VER		"1.3-FreeBSD"
37
38static void		 usage(void);
39
40extern char		*__progname;
41
42struct source		 src;
43
44struct option long_options[] =
45{
46	{"expression",		required_argument,	NULL,	'e'},
47	{"file",		required_argument,	NULL,	'f'},
48	{"help",		no_argument,		NULL,	'h'},
49	{"version",		no_argument,		NULL,	'V'}
50};
51
52static void
53usage(void)
54{
55	fprintf(stderr, "usage: %s [-hVx] [-e expression] [file]\n",
56	    __progname);
57	exit(1);
58}
59
60static void
61procfile(char *fname) {
62	struct stat st;
63	FILE *file;
64
65	file = fopen(fname, "r");
66	if (file == NULL)
67		err(1, "cannot open file %s", fname);
68	if (fstat(fileno(file), &st) == -1)
69		err(1, "%s", fname);
70	if (S_ISDIR(st.st_mode)) {
71		errno = EISDIR;
72		err(1, "%s", fname);
73	}
74	src_setstream(&src, file);
75	reset_bmachine(&src);
76	eval();
77	fclose(file);
78}
79
80int
81main(int argc, char *argv[])
82{
83	int ch;
84	bool extended_regs = false, preproc_done = false;
85
86	/* accept and ignore a single dash to be 4.4BSD dc(1) compatible */
87	while ((ch = getopt_long(argc, argv, "e:f:Vx", long_options, NULL)) != -1) {
88		switch (ch) {
89		case 'e':
90			src_setstring(&src, optarg);
91			reset_bmachine(&src);
92			eval();
93			preproc_done = true;
94			break;
95		case 'f':
96			procfile(optarg);
97			preproc_done = true;
98			break;
99		case 'x':
100			extended_regs = true;
101			break;
102		case 'V':
103			fprintf(stderr, "%s (BSD bc) %s\n", __progname, DC_VER);
104			exit(0);
105			break;
106		case '-':
107			break;
108		case 'h':
109			/* FALLTHROUGH */
110		default:
111			usage();
112		}
113	}
114	argc -= optind;
115	argv += optind;
116
117	init_bmachine(extended_regs);
118	setlinebuf(stdout);
119	setlinebuf(stderr);
120
121	if (argc > 1)
122		usage();
123	if (argc == 1) {
124		procfile(argv[0]);
125		preproc_done = true;
126	}
127	if (preproc_done)
128		return (0);
129
130	src_setstream(&src, stdin);
131	reset_bmachine(&src);
132	eval();
133
134	return (0);
135}
136