6ef0daee41
Prefer setvbuf() to setlinebuf() for portability. Some style(9) and redundant tests for NULL. These are only meant to ease up merging newer changes but we are skipping changes done in order to accomodate OpenBSD's pledge support. Obtained from: OpenBSD MFC after: 2 weeks
157 lines
3.5 KiB
C
157 lines
3.5 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 <capsicum_helpers.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 <fcntl.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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procfd(int fd, char *fname) {
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struct stat st;
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FILE *file;
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file = fdopen(fd, "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, fd;
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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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fd = open(optarg, O_RDONLY);
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if (fd < 0)
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err(1, "cannot open file %s", optarg);
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procfd(fd, 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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(void)setvbuf(stdout, NULL, _IOLBF, 0);
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(void)setvbuf(stderr, NULL, _IOLBF, 0);
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if (argc > 1)
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usage();
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if (argc == 1) {
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fd = open(argv[0], O_RDONLY);
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if (fd < 0)
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err(1, "cannot open file %s", argv[0]);
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if (caph_limit_stream(fd, CAPH_READ) < 0 ||
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caph_limit_stdio() < 0 ||
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(cap_enter() < 0 && errno != ENOSYS))
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err(1, "capsicum");
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procfd(fd, 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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if (caph_limit_stdio() < 0 || (cap_enter() < 0 && errno != ENOSYS))
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err(1, "capsicum");
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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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