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