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 37 #if 0 38 #ifndef lint 39 static char sccsid[] = "@(#)apply.c 8.4 (Berkeley) 4/4/94"; 40 #endif 41 #endif 42 43 #include <sys/cdefs.h> 44 __FBSDID("$FreeBSD$"); 45 46 #include <sys/types.h> 47 #include <sys/wait.h> 48 49 #include <ctype.h> 50 #include <err.h> 51 #include <paths.h> 52 #include <signal.h> 53 #include <stdio.h> 54 #include <stdlib.h> 55 #include <string.h> 56 #include <unistd.h> 57 58 #define EXEC "exec " 59 60 static int exec_shell(const char *, char *, char *); 61 static void usage(void); 62 63 int 64 main(int argc, char *argv[]) { 65 int ch, debug, i, magic, n, nargs, offset, rval; 66 size_t clen, cmdsize, l; 67 char *c, *cmd, *name, *p, *q, *shell, *slashp, *tmpshell; 68 69 debug = 0; 70 magic = '%'; /* Default magic char is `%'. */ 71 nargs = -1; 72 while ((ch = getopt(argc, argv, "a:d0123456789")) != -1) 73 switch (ch) { 74 case 'a': 75 if (optarg[1] != '\0') 76 errx(1, 77 "illegal magic character specification"); 78 magic = optarg[0]; 79 break; 80 case 'd': 81 debug = 1; 82 break; 83 case '0': case '1': case '2': case '3': case '4': 84 case '5': case '6': case '7': case '8': case '9': 85 if (nargs != -1) 86 errx(1, 87 "only one -# argument may be specified"); 88 nargs = optopt - '0'; 89 break; 90 default: 91 usage(); 92 } 93 argc -= optind; 94 argv += optind; 95 96 if (argc < 2) 97 usage(); 98 99 /* 100 * The command to run is argv[0], and the args are argv[1..]. 101 * Look for %digit references in the command, remembering the 102 * largest one. 103 */ 104 for (n = 0, p = argv[0]; *p != '\0'; ++p) 105 if (p[0] == magic && isdigit(p[1]) && p[1] != '0') { 106 ++p; 107 if (p[0] - '0' > n) 108 n = p[0] - '0'; 109 } 110 111 /* 112 * Figure out the shell and name arguments to pass to execl() 113 * in exec_shell(). Always malloc() shell and just set name 114 * to point at the last part of shell if there are any backslashes, 115 * otherwise just set it to point at the space malloc()'d. If 116 * SHELL environment variable exists, replace contents of 117 * shell with it. 118 */ 119 shell = name = NULL; 120 tmpshell = getenv("SHELL"); 121 shell = (tmpshell != NULL) ? strdup(tmpshell) : strdup(_PATH_BSHELL); 122 if (shell == NULL) 123 err(1, "strdup() failed"); 124 slashp = strrchr(shell, '/'); 125 name = (slashp != NULL) ? slashp + 1 : shell; 126 127 /* 128 * If there were any %digit references, then use those, otherwise 129 * build a new command string with sufficient %digit references at 130 * the end to consume (nargs) arguments each time round the loop. 131 * Allocate enough space to hold the maximum command. Save the 132 * size to pass to snprintf(). 133 */ 134 cmdsize = sizeof(EXEC) - 1 + strlen(argv[0]) 135 + 9 * (sizeof(" %1") - 1) + 1; 136 if ((cmd = malloc(cmdsize)) == NULL) 137 err(1, NULL); 138 139 if (n == 0) { 140 /* If nargs not set, default to a single argument. */ 141 if (nargs == -1) 142 nargs = 1; 143 144 p = cmd; 145 offset = snprintf(cmd, cmdsize, EXEC "%s", argv[0]); 146 if ((size_t)offset >= cmdsize) 147 err(1, "snprintf() failed"); 148 p += offset; 149 cmdsize -= offset; 150 for (i = 1; i <= nargs; i++) { 151 offset = snprintf(p, cmdsize, " %c%d", magic, i); 152 if ((size_t)offset >= cmdsize) 153 err(1, "snprintf() failed"); 154 p += offset; 155 cmdsize -= offset; 156 } 157 158 /* 159 * If nargs set to the special value 0, eat a single 160 * argument for each command execution. 161 */ 162 if (nargs == 0) 163 nargs = 1; 164 } else { 165 offset = snprintf(cmd, cmdsize, EXEC "%s", argv[0]); 166 if ((size_t)offset >= cmdsize) 167 err(1, "snprintf() failed"); 168 nargs = n; 169 } 170 171 /* 172 * Grab some space in which to build the command. Allocate 173 * as necessary later, but no reason to build it up slowly 174 * for the normal case. 175 */ 176 if ((c = malloc(clen = 1024)) == NULL) 177 err(1, NULL); 178 179 /* 180 * (argc) and (argv) are still offset by one to make it simpler to 181 * expand %digit references. At the end of the loop check for (argc) 182 * equals 1 means that all the (argv) has been consumed. 183 */ 184 for (rval = 0; argc > nargs; argc -= nargs, argv += nargs) { 185 /* 186 * Find a max value for the command length, and ensure 187 * there's enough space to build it. 188 */ 189 for (l = strlen(cmd), i = 0; i < nargs; i++) 190 l += strlen(argv[i+1]); 191 if (l > clen && (c = realloc(c, clen = l)) == NULL) 192 err(1, NULL); 193 194 /* Expand command argv references. */ 195 for (p = cmd, q = c; *p != '\0'; ++p) 196 if (p[0] == magic && isdigit(p[1]) && p[1] != '0') { 197 offset = snprintf(q, l, "%s", 198 argv[(++p)[0] - '0']); 199 if ((size_t)offset >= l) 200 err(1, "snprintf() failed"); 201 q += offset; 202 l -= offset; 203 } else 204 *q++ = *p; 205 206 /* Terminate the command string. */ 207 *q = '\0'; 208 209 /* Run the command. */ 210 if (debug) 211 (void)printf("%s\n", c); 212 else 213 if (exec_shell(c, shell, name)) 214 rval = 1; 215 } 216 217 if (argc != 1) 218 errx(1, "expecting additional argument%s after \"%s\"", 219 (nargs - argc) ? "s" : "", argv[argc - 1]); 220 free(cmd); 221 free(c); 222 free(shell); 223 exit(rval); 224 } 225 226 /* 227 * exec_shell -- 228 * Execute a shell command using passed use_shell and use_name 229 * arguments. 230 */ 231 static int 232 exec_shell(const char *command, char *use_shell, char *use_name) 233 { 234 pid_t pid; 235 int omask, pstat; 236 sig_t intsave, quitsave; 237 238 if (!command) /* just checking... */ 239 return(1); 240 241 omask = sigblock(sigmask(SIGCHLD)); 242 switch(pid = vfork()) { 243 case -1: /* error */ 244 err(1, "vfork"); 245 case 0: /* child */ 246 (void)sigsetmask(omask); 247 execl(use_shell, use_name, "-c", command, (char *)NULL); 248 warn("%s", use_shell); 249 _exit(1); 250 } 251 intsave = signal(SIGINT, SIG_IGN); 252 quitsave = signal(SIGQUIT, SIG_IGN); 253 pid = waitpid(pid, &pstat, 0); 254 (void)sigsetmask(omask); 255 (void)signal(SIGINT, intsave); 256 (void)signal(SIGQUIT, quitsave); 257 return(pid == -1 ? -1 : pstat); 258 } 259 260 void 261 usage(void) 262 { 263 264 (void)fprintf(stderr, 265 "usage: apply [-a magic] [-d] [-0123456789] command arguments ...\n"); 266 exit(1); 267 } 268