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 * $DragonFly: src/usr.bin/apply/apply.c,v 1.5 2005/01/04 05:45:02 cpressey Exp $ 35 */ 36 37 #include <sys/types.h> 38 39 #include <sys/wait.h> 40 41 #include <ctype.h> 42 #include <err.h> 43 #include <paths.h> 44 #include <signal.h> 45 #include <stdio.h> 46 #include <stdlib.h> 47 #include <string.h> 48 #include <unistd.h> 49 50 #define EXEC "exec " 51 52 static int exec_shell(const char *, char *, char *); 53 static void usage(void); 54 55 int 56 main(int argc, char *argv[]) 57 { 58 int ch, debug, i, magic, n, nargs, offset, rval; 59 size_t clen, cmdsize, l; 60 char *c, *cmd, *name, *p, *q, *shell, *slashp, *tmpshell; 61 62 debug = 0; 63 magic = '%'; /* Default magic char is `%'. */ 64 nargs = -1; 65 while ((ch = getopt(argc, argv, "a:d0123456789")) != -1) 66 switch (ch) { 67 case 'a': 68 if (optarg[1] != '\0') 69 errx(1, 70 "illegal magic character specification"); 71 magic = optarg[0]; 72 break; 73 case 'd': 74 debug = 1; 75 break; 76 case '0': case '1': case '2': case '3': case '4': 77 case '5': case '6': case '7': case '8': case '9': 78 if (nargs != -1) 79 errx(1, 80 "only one -# argument may be specified"); 81 nargs = optopt - '0'; 82 break; 83 default: 84 usage(); 85 } 86 argc -= optind; 87 argv += optind; 88 89 if (argc < 2) 90 usage(); 91 92 /* 93 * The command to run is argv[0], and the args are argv[1..]. 94 * Look for %digit references in the command, remembering the 95 * largest one. 96 */ 97 for (n = 0, p = argv[0]; *p != '\0'; ++p) 98 if (p[0] == magic && isdigit(p[1]) && p[1] != '0') { 99 ++p; 100 if (p[0] - '0' > n) 101 n = p[0] - '0'; 102 } 103 104 /* 105 * Figure out the shell and name arguments to pass to execl() 106 * in exec_shell(). Always malloc() shell and just set name 107 * to point at the last part of shell if there are any backslashes, 108 * otherwise just set it to point at the space malloc()'d. If 109 * SHELL environment variable exists, replace contents of 110 * shell with it. 111 */ 112 shell = name = NULL; 113 tmpshell = getenv("SHELL"); 114 shell = (tmpshell != NULL) ? strdup(tmpshell) : strdup(_PATH_BSHELL); 115 if (shell == NULL) 116 err(1, "strdup() failed"); 117 slashp = strrchr(shell, '/'); 118 name = (slashp != NULL) ? slashp + 1 : shell; 119 120 /* 121 * If there were any %digit references, then use those, otherwise 122 * build a new command string with sufficient %digit references at 123 * the end to consume (nargs) arguments each time round the loop. 124 * Allocate enough space to hold the maximum command. Save the 125 * size to pass to snprintf(). 126 */ 127 cmdsize = sizeof(EXEC) - 1 + strlen(argv[0]) 128 + 9 * (sizeof(" %1") - 1) + 1; 129 if ((cmd = malloc(cmdsize)) == NULL) 130 err(1, NULL); 131 132 if (n == 0) { 133 /* If nargs not set, default to a single argument. */ 134 if (nargs == -1) 135 nargs = 1; 136 137 p = cmd; 138 offset = snprintf(cmd, cmdsize, EXEC "%s", argv[0]); 139 if ((size_t)offset >= cmdsize) 140 err(1, "snprintf() failed"); 141 p += offset; 142 cmdsize -= offset; 143 for (i = 1; i <= nargs; i++) { 144 offset = snprintf(p, cmdsize, " %c%d", magic, i); 145 if ((size_t)offset >= cmdsize) 146 err(1, "snprintf() failed"); 147 p += offset; 148 cmdsize -= offset; 149 } 150 151 /* 152 * If nargs set to the special value 0, eat a single 153 * argument for each command execution. 154 */ 155 if (nargs == 0) 156 nargs = 1; 157 } else { 158 offset = snprintf(cmd, cmdsize, EXEC "%s", argv[0]); 159 if ((size_t)offset >= cmdsize) 160 err(1, "snprintf() failed"); 161 nargs = n; 162 } 163 164 /* 165 * Grab some space in which to build the command. Allocate 166 * as necessary later, but no reason to build it up slowly 167 * for the normal case. 168 */ 169 if ((c = malloc(clen = 1024)) == NULL) 170 err(1, NULL); 171 172 /* 173 * (argc) and (argv) are still offset by one to make it simpler to 174 * expand %digit references. At the end of the loop check for (argc) 175 * equals 1 means that all the (argv) has been consumed. 176 */ 177 for (rval = 0; argc > nargs; argc -= nargs, argv += nargs) { 178 /* 179 * Find a max value for the command length, and ensure 180 * there's enough space to build it. 181 */ 182 for (l = strlen(cmd), i = 0; i < nargs; i++) 183 l += strlen(argv[i+1]); 184 if (l > clen && (c = realloc(c, clen = l)) == NULL) 185 err(1, NULL); 186 187 /* Expand command argv references. */ 188 for (p = cmd, q = c; *p != '\0'; ++p) { 189 if (p[0] == magic && isdigit(p[1]) && p[1] != '0') { 190 offset = snprintf(q, l, "%s", 191 argv[(++p)[0] - '0']); 192 if ((size_t)offset >= l) 193 err(1, "snprintf() failed"); 194 q += offset; 195 l -= offset; 196 } else { 197 *q++ = *p; 198 } 199 } 200 201 /* Terminate the command string. */ 202 *q = '\0'; 203 204 /* Run the command. */ 205 if (debug) { 206 printf("%s\n", c); 207 } else { 208 if (exec_shell(c, shell, name)) 209 rval = 1; 210 } 211 } 212 213 if (argc != 1) 214 errx(1, "expecting additional argument%s after \"%s\"", 215 (nargs - argc) ? "s" : "", argv[argc - 1]); 216 free(cmd); 217 free(c); 218 free(shell); 219 exit(rval); 220 } 221 222 /* 223 * exec_shell -- 224 * Execute a shell command using passed use_shell and use_name 225 * arguments. 226 */ 227 static int 228 exec_shell(const char *command, char *use_shell, char *use_name) 229 { 230 pid_t pid; 231 int omask, pstat; 232 sig_t intsave, quitsave; 233 234 if (command == NULL) /* just checking... */ 235 return(1); 236 237 omask = sigblock(sigmask(SIGCHLD)); 238 switch(pid = vfork()) { 239 case -1: /* error */ 240 err(1, "vfork"); 241 case 0: /* child */ 242 (void)sigsetmask(omask); 243 execl(use_shell, use_name, "-c", command, NULL); 244 warn("%s", use_shell); 245 _exit(1); 246 } 247 intsave = signal(SIGINT, SIG_IGN); 248 quitsave = signal(SIGQUIT, SIG_IGN); 249 pid = waitpid(pid, &pstat, 0); 250 sigsetmask(omask); 251 signal(SIGINT, intsave); 252 signal(SIGQUIT, quitsave); 253 return(pid == -1 ? -1 : pstat); 254 } 255 256 void 257 usage(void) 258 { 259 fprintf(stderr, 260 "usage: apply [-a magic] [-d] [-0123456789] " 261 "command arguments ...\n"); 262 exit(1); 263 } 264