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("$FreeBSD$"); 22 23 #include <sys/stat.h> 24 25 #include <capsicum_helpers.h> 26 #include <ctype.h> 27 #include <err.h> 28 #include <errno.h> 29 #include <fcntl.h> 30 #include <getopt.h> 31 #include <stdio.h> 32 #include <stdlib.h> 33 #include <string.h> 34 #include <unistd.h> 35 36 #include "extern.h" 37 38 #define DC_VER "1.3-FreeBSD" 39 40 static void usage(void); 41 42 extern char *__progname; 43 44 static struct source src; 45 46 static const struct option long_options[] = 47 { 48 {"expression", required_argument, NULL, 'e'}, 49 {"file", required_argument, NULL, 'f'}, 50 {"help", no_argument, NULL, 'h'}, 51 {"version", no_argument, NULL, 'V'} 52 }; 53 54 static void 55 usage(void) 56 { 57 fprintf(stderr, "usage: %s [-hVx] [-e expression] [file]\n", 58 __progname); 59 exit(1); 60 } 61 62 static void 63 procfd(int fd, char *fname) { 64 struct stat st; 65 FILE *file; 66 67 file = fdopen(fd, "r"); 68 if (file == NULL) 69 err(1, "cannot open file %s", fname); 70 if (fstat(fileno(file), &st) == -1) 71 err(1, "%s", fname); 72 if (S_ISDIR(st.st_mode)) { 73 errno = EISDIR; 74 err(1, "%s", fname); 75 } 76 src_setstream(&src, file); 77 reset_bmachine(&src); 78 eval(); 79 fclose(file); 80 } 81 82 int 83 main(int argc, char *argv[]) 84 { 85 int ch, fd; 86 bool extended_regs = false, preproc_done = false; 87 88 /* accept and ignore a single dash to be 4.4BSD dc(1) compatible */ 89 while ((ch = getopt_long(argc, argv, "e:f:hVx", long_options, NULL)) != -1) { 90 switch (ch) { 91 case 'e': 92 if (!preproc_done) 93 init_bmachine(extended_regs); 94 src_setstring(&src, optarg); 95 reset_bmachine(&src); 96 eval(); 97 preproc_done = true; 98 break; 99 case 'f': 100 if (!preproc_done) 101 init_bmachine(extended_regs); 102 fd = open(optarg, O_RDONLY); 103 if (fd < 0) 104 err(1, "cannot open file %s", optarg); 105 procfd(fd, optarg); 106 preproc_done = true; 107 break; 108 case 'x': 109 extended_regs = true; 110 break; 111 case 'V': 112 fprintf(stderr, "%s (BSD bc) %s\n", __progname, DC_VER); 113 exit(0); 114 break; 115 case '-': 116 break; 117 case 'h': 118 /* FALLTHROUGH */ 119 default: 120 usage(); 121 } 122 } 123 argc -= optind; 124 argv += optind; 125 126 if (!preproc_done) 127 init_bmachine(extended_regs); 128 (void)setvbuf(stdout, NULL, _IOLBF, 0); 129 (void)setvbuf(stderr, NULL, _IOLBF, 0); 130 131 if (argc > 1) 132 usage(); 133 if (argc == 1) { 134 fd = open(argv[0], O_RDONLY); 135 if (fd < 0) 136 err(1, "cannot open file %s", argv[0]); 137 138 if (caph_limit_stream(fd, CAPH_READ) < 0 || 139 caph_limit_stdio() < 0 || 140 caph_enter() < 0) 141 err(1, "capsicum"); 142 143 procfd(fd, argv[0]); 144 preproc_done = true; 145 } 146 if (preproc_done) 147 return (0); 148 149 if (caph_limit_stdio() < 0 || caph_enter()) 150 err(1, "capsicum"); 151 src_setstream(&src, stdin); 152 reset_bmachine(&src); 153 eval(); 154 155 return (0); 156 } 157