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 #include <sys/stat.h> 22 23 #include <capsicum_helpers.h> 24 #include <ctype.h> 25 #include <err.h> 26 #include <errno.h> 27 #include <fcntl.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 38 static void usage(void); 39 40 extern char *__progname; 41 42 static struct source src; 43 44 static const struct 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 52 static void 53 usage(void) 54 { 55 fprintf(stderr, "usage: %s [-hVx] [-e expression] [file]\n", 56 __progname); 57 exit(1); 58 } 59 60 static void 61 procfd(int fd, char *fname) { 62 struct stat st; 63 FILE *file; 64 65 file = fdopen(fd, "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 80 int 81 main(int argc, char *argv[]) 82 { 83 int ch, fd; 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:hVx", long_options, NULL)) != -1) { 88 switch (ch) { 89 case 'e': 90 if (!preproc_done) 91 init_bmachine(extended_regs); 92 src_setstring(&src, optarg); 93 reset_bmachine(&src); 94 eval(); 95 preproc_done = true; 96 break; 97 case 'f': 98 if (!preproc_done) 99 init_bmachine(extended_regs); 100 fd = open(optarg, O_RDONLY); 101 if (fd < 0) 102 err(1, "cannot open file %s", optarg); 103 procfd(fd, optarg); 104 preproc_done = true; 105 break; 106 case 'x': 107 extended_regs = true; 108 break; 109 case 'V': 110 fprintf(stderr, "%s (BSD bc) %s\n", __progname, DC_VER); 111 exit(0); 112 break; 113 case '-': 114 break; 115 case 'h': 116 /* FALLTHROUGH */ 117 default: 118 usage(); 119 } 120 } 121 argc -= optind; 122 argv += optind; 123 124 if (!preproc_done) 125 init_bmachine(extended_regs); 126 (void)setvbuf(stdout, NULL, _IOLBF, 0); 127 (void)setvbuf(stderr, NULL, _IOLBF, 0); 128 129 if (argc > 1) 130 usage(); 131 if (argc == 1) { 132 fd = open(argv[0], O_RDONLY); 133 if (fd < 0) 134 err(1, "cannot open file %s", argv[0]); 135 136 if (caph_limit_stream(fd, CAPH_READ) < 0 || 137 caph_limit_stdio() < 0 || 138 caph_enter() < 0) 139 err(1, "capsicum"); 140 141 procfd(fd, argv[0]); 142 preproc_done = true; 143 } 144 if (preproc_done) 145 return (0); 146 147 if (caph_limit_stdio() < 0 || caph_enter()) 148 err(1, "capsicum"); 149 src_setstream(&src, stdin); 150 reset_bmachine(&src); 151 eval(); 152 153 return (0); 154 } 155