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. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)apply.c 8.4 (Berkeley) 4/4/94 37 * $FreeBSD: src/usr.bin/apply/apply.c,v 1.8.2.3 2001/08/01 23:28:04 obrien Exp $ 38 * $DragonFly: src/usr.bin/apply/apply.c,v 1.2 2003/06/17 04:29:25 dillon Exp $ 39 */ 40 41 #include <sys/types.h> 42 43 #include <sys/wait.h> 44 45 #include <ctype.h> 46 #include <err.h> 47 #include <paths.h> 48 #include <signal.h> 49 #include <stdio.h> 50 #include <stdlib.h> 51 #include <string.h> 52 #include <unistd.h> 53 54 #define EXEC "exec " 55 56 static int exec_shell(const char *, char *, char *); 57 static void usage(void); 58 59 int 60 main(int argc, char *argv[]) { 61 int ch, debug, i, magic, n, nargs, offset, rval; 62 size_t clen, cmdsize, l; 63 char *c, *cmd, *name, *p, *q, *shell, *slashp, *tmpshell; 64 65 debug = 0; 66 magic = '%'; /* Default magic char is `%'. */ 67 nargs = -1; 68 while ((ch = getopt(argc, argv, "a:d0123456789")) != -1) 69 switch (ch) { 70 case 'a': 71 if (optarg[1] != '\0') 72 errx(1, 73 "illegal magic character specification"); 74 magic = optarg[0]; 75 break; 76 case 'd': 77 debug = 1; 78 break; 79 case '0': case '1': case '2': case '3': case '4': 80 case '5': case '6': case '7': case '8': case '9': 81 if (nargs != -1) 82 errx(1, 83 "only one -# argument may be specified"); 84 nargs = optopt - '0'; 85 break; 86 default: 87 usage(); 88 } 89 argc -= optind; 90 argv += optind; 91 92 if (argc < 2) 93 usage(); 94 95 /* 96 * The command to run is argv[0], and the args are argv[1..]. 97 * Look for %digit references in the command, remembering the 98 * largest one. 99 */ 100 for (n = 0, p = argv[0]; *p != '\0'; ++p) 101 if (p[0] == magic && isdigit(p[1]) && p[1] != '0') { 102 ++p; 103 if (p[0] - '0' > n) 104 n = p[0] - '0'; 105 } 106 107 /* 108 * Figure out the shell and name arguments to pass to execl() 109 * in exec_shell(). Always malloc() shell and just set name 110 * to point at the last part of shell if there are any backslashes, 111 * otherwise just set it to point at the space malloc()'d. If 112 * SHELL environment variable exists, replace contents of 113 * shell with it. 114 */ 115 shell = name = NULL; 116 tmpshell = getenv("SHELL"); 117 shell = (tmpshell != NULL) ? strdup(tmpshell) : strdup(_PATH_BSHELL); 118 if (shell == NULL) 119 err(1, "strdup() failed"); 120 slashp = strrchr(shell, '/'); 121 name = (slashp != NULL) ? slashp + 1 : shell; 122 123 /* 124 * If there were any %digit references, then use those, otherwise 125 * build a new command string with sufficient %digit references at 126 * the end to consume (nargs) arguments each time round the loop. 127 * Allocate enough space to hold the maximum command. Save the 128 * size to pass to snprintf(). 129 */ 130 cmdsize = sizeof(EXEC) - 1 + strlen(argv[0]) 131 + 9 * (sizeof(" %1") - 1) + 1; 132 if ((cmd = malloc(cmdsize)) == NULL) 133 err(1, NULL); 134 135 if (n == 0) { 136 /* If nargs not set, default to a single argument. */ 137 if (nargs == -1) 138 nargs = 1; 139 140 p = cmd; 141 offset = snprintf(cmd, cmdsize, EXEC "%s", argv[0]); 142 if ((size_t)offset >= cmdsize) 143 err(1, "snprintf() failed"); 144 p += offset; 145 cmdsize -= offset; 146 for (i = 1; i <= nargs; i++) { 147 offset = snprintf(p, cmdsize, " %c%d", magic, i); 148 if ((size_t)offset >= cmdsize) 149 err(1, "snprintf() failed"); 150 p += offset; 151 cmdsize -= offset; 152 } 153 154 /* 155 * If nargs set to the special value 0, eat a single 156 * argument for each command execution. 157 */ 158 if (nargs == 0) 159 nargs = 1; 160 } else { 161 offset = snprintf(cmd, cmdsize, EXEC "%s", argv[0]); 162 if ((size_t)offset >= cmdsize) 163 err(1, "snprintf() failed"); 164 nargs = n; 165 } 166 167 /* 168 * Grab some space in which to build the command. Allocate 169 * as necessary later, but no reason to build it up slowly 170 * for the normal case. 171 */ 172 if ((c = malloc(clen = 1024)) == NULL) 173 err(1, NULL); 174 175 /* 176 * (argc) and (argv) are still offset by one to make it simpler to 177 * expand %digit references. At the end of the loop check for (argc) 178 * equals 1 means that all the (argv) has been consumed. 179 */ 180 for (rval = 0; argc > nargs; argc -= nargs, argv += nargs) { 181 /* 182 * Find a max value for the command length, and ensure 183 * there's enough space to build it. 184 */ 185 for (l = strlen(cmd), i = 0; i < nargs; i++) 186 l += strlen(argv[i+1]); 187 if (l > clen && (c = realloc(c, clen = l)) == NULL) 188 err(1, NULL); 189 190 /* Expand command argv references. */ 191 for (p = cmd, q = c; *p != '\0'; ++p) 192 if (p[0] == magic && isdigit(p[1]) && p[1] != '0') { 193 offset = snprintf(q, l, "%s", 194 argv[(++p)[0] - '0']); 195 if ((size_t)offset >= l) 196 err(1, "snprintf() failed"); 197 q += offset; 198 l -= offset; 199 } else 200 *q++ = *p; 201 202 /* Terminate the command string. */ 203 *q = '\0'; 204 205 /* Run the command. */ 206 if (debug) 207 (void)printf("%s\n", c); 208 else 209 if (exec_shell(c, shell, name)) 210 rval = 1; 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) /* 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, (char *)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 (void)sigsetmask(omask); 251 (void)signal(SIGINT, intsave); 252 (void)signal(SIGQUIT, quitsave); 253 return(pid == -1 ? -1 : pstat); 254 } 255 256 void 257 usage() 258 { 259 260 (void)fprintf(stderr, 261 "usage: apply [-a magic] [-d] [-0123456789] command arguments ...\n"); 262 exit(1); 263 } 264