1 /*- 2 * Copyright (c) 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Jan-Simon Pendry. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)apply.c 8.4 (Berkeley) 4/4/94 33 * $FreeBSD: src/usr.bin/apply/apply.c,v 1.8.2.3 2001/08/01 23:28:04 obrien Exp $ 34 */ 35 36 #include <sys/types.h> 37 38 #include <sys/wait.h> 39 40 #include <ctype.h> 41 #include <err.h> 42 #include <paths.h> 43 #include <signal.h> 44 #include <stdio.h> 45 #include <stdlib.h> 46 #include <string.h> 47 #include <unistd.h> 48 49 #define EXEC "exec " 50 51 static int exec_shell(const char *, const char *, const char *); 52 static void usage(void); 53 54 int 55 main(int argc, char *argv[]) 56 { 57 int ch, debug, i, magic, n, nargs, offset, rval; 58 size_t clen, cmdsize, l; 59 char *c, *cmd, *name, *p, *q, *shell, *slashp, *tmpshell; 60 61 debug = 0; 62 magic = '%'; /* Default magic char is `%'. */ 63 nargs = -1; 64 while ((ch = getopt(argc, argv, "a:d0123456789")) != -1) 65 switch (ch) { 66 case 'a': 67 if (optarg[1] != '\0') 68 errx(1, 69 "illegal magic character specification"); 70 magic = optarg[0]; 71 break; 72 case 'd': 73 debug = 1; 74 break; 75 case '0': case '1': case '2': case '3': case '4': 76 case '5': case '6': case '7': case '8': case '9': 77 if (nargs != -1) 78 errx(1, 79 "only one -# argument may be specified"); 80 nargs = optopt - '0'; 81 break; 82 default: 83 usage(); 84 } 85 argc -= optind; 86 argv += optind; 87 88 if (argc < 2) 89 usage(); 90 91 /* 92 * The command to run is argv[0], and the args are argv[1..]. 93 * Look for %digit references in the command, remembering the 94 * largest one. 95 */ 96 for (n = 0, p = argv[0]; *p != '\0'; ++p) 97 if (p[0] == magic && isdigit(p[1]) && p[1] != '0') { 98 ++p; 99 if (p[0] - '0' > n) 100 n = p[0] - '0'; 101 } 102 103 /* 104 * Figure out the shell and name arguments to pass to execl() 105 * in exec_shell(). Always malloc() shell and just set name 106 * to point at the last part of shell if there are any backslashes, 107 * otherwise just set it to point at the space malloc()'d. If 108 * SHELL environment variable exists, replace contents of 109 * shell with it. 110 */ 111 shell = name = NULL; 112 tmpshell = getenv("SHELL"); 113 shell = (tmpshell != NULL) ? strdup(tmpshell) : strdup(_PATH_BSHELL); 114 if (shell == NULL) 115 err(1, "strdup() failed"); 116 slashp = strrchr(shell, '/'); 117 name = (slashp != NULL) ? slashp + 1 : shell; 118 119 /* 120 * If there were any %digit references, then use those, otherwise 121 * build a new command string with sufficient %digit references at 122 * the end to consume (nargs) arguments each time round the loop. 123 * Allocate enough space to hold the maximum command. Save the 124 * size to pass to snprintf(). 125 */ 126 cmdsize = sizeof(EXEC) - 1 + strlen(argv[0]) 127 + 9 * (sizeof(" %1") - 1) + 1; 128 if ((cmd = malloc(cmdsize)) == NULL) 129 err(1, NULL); 130 131 if (n == 0) { 132 /* If nargs not set, default to a single argument. */ 133 if (nargs == -1) 134 nargs = 1; 135 136 p = cmd; 137 offset = snprintf(cmd, cmdsize, EXEC "%s", argv[0]); 138 if ((size_t)offset >= cmdsize) 139 err(1, "snprintf() failed"); 140 p += offset; 141 cmdsize -= offset; 142 for (i = 1; i <= nargs; i++) { 143 offset = snprintf(p, cmdsize, " %c%d", magic, i); 144 if ((size_t)offset >= cmdsize) 145 err(1, "snprintf() failed"); 146 p += offset; 147 cmdsize -= offset; 148 } 149 150 /* 151 * If nargs set to the special value 0, eat a single 152 * argument for each command execution. 153 */ 154 if (nargs == 0) 155 nargs = 1; 156 } else { 157 offset = snprintf(cmd, cmdsize, EXEC "%s", argv[0]); 158 if ((size_t)offset >= cmdsize) 159 err(1, "snprintf() failed"); 160 nargs = n; 161 } 162 163 /* 164 * Grab some space in which to build the command. Allocate 165 * as necessary later, but no reason to build it up slowly 166 * for the normal case. 167 */ 168 if ((c = malloc(clen = 1024)) == NULL) 169 err(1, NULL); 170 171 /* 172 * (argc) and (argv) are still offset by one to make it simpler to 173 * expand %digit references. At the end of the loop check for (argc) 174 * equals 1 means that all the (argv) has been consumed. 175 */ 176 for (rval = 0; argc > nargs; argc -= nargs, argv += nargs) { 177 /* 178 * Find a max value for the command length, and ensure 179 * there's enough space to build it. 180 */ 181 for (l = strlen(cmd), i = 0; i < nargs; i++) 182 l += strlen(argv[i+1]); 183 if (l > clen && (c = realloc(c, clen = l)) == NULL) 184 err(1, NULL); 185 186 /* Expand command argv references. */ 187 for (p = cmd, q = c; *p != '\0'; ++p) { 188 if (p[0] == magic && isdigit(p[1]) && p[1] != '0') { 189 offset = snprintf(q, l, "%s", 190 argv[(++p)[0] - '0']); 191 if ((size_t)offset >= l) 192 err(1, "snprintf() failed"); 193 q += offset; 194 l -= offset; 195 } else { 196 *q++ = *p; 197 } 198 } 199 200 /* Terminate the command string. */ 201 *q = '\0'; 202 203 /* Run the command. */ 204 if (debug) { 205 printf("%s\n", c); 206 } else { 207 if (exec_shell(c, shell, name)) 208 rval = 1; 209 } 210 } 211 212 if (argc != 1) 213 errx(1, "expecting additional argument%s after \"%s\"", 214 (nargs - argc) ? "s" : "", argv[argc - 1]); 215 free(cmd); 216 free(c); 217 free(shell); 218 exit(rval); 219 } 220 221 /* 222 * exec_shell -- 223 * Execute a shell command using passed use_shell and use_name 224 * arguments. 225 */ 226 static int 227 exec_shell(const char *command, const char *use_shell, const char *use_name) 228 { 229 pid_t pid; 230 int omask, pstat; 231 sig_t intsave, quitsave; 232 233 if (command == NULL) /* just checking... */ 234 return(1); 235 236 omask = sigblock(sigmask(SIGCHLD)); 237 switch(pid = vfork()) { 238 case -1: /* error */ 239 err(1, "vfork"); 240 case 0: /* child */ 241 (void)sigsetmask(omask); 242 execl(use_shell, use_name, "-c", command, NULL); 243 warn("%s", use_shell); 244 _exit(1); 245 } 246 intsave = signal(SIGINT, SIG_IGN); 247 quitsave = signal(SIGQUIT, SIG_IGN); 248 pid = waitpid(pid, &pstat, 0); 249 sigsetmask(omask); 250 signal(SIGINT, intsave); 251 signal(SIGQUIT, quitsave); 252 return(pid == -1 ? -1 : pstat); 253 } 254 255 static void 256 usage(void) 257 { 258 fprintf(stderr, 259 "usage: apply [-a magic] [-d] [-0123456789] " 260 "command arguments ...\n"); 261 exit(1); 262 } 263