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 * 4. 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 33 #if 0 34 #ifndef lint 35 static char sccsid[] = "@(#)apply.c 8.4 (Berkeley) 4/4/94"; 36 #endif 37 #endif 38 39 #include <sys/cdefs.h> 40 __FBSDID("$FreeBSD$"); 41 42 #include <sys/types.h> 43 #include <sys/sbuf.h> 44 #include <sys/wait.h> 45 46 #include <ctype.h> 47 #include <err.h> 48 #include <errno.h> 49 #include <paths.h> 50 #include <signal.h> 51 #include <stdio.h> 52 #include <stdlib.h> 53 #include <string.h> 54 #include <unistd.h> 55 56 #define EXEC "exec " 57 58 static int exec_shell(const char *, const char *, const char *); 59 static void usage(void); 60 61 int 62 main(int argc, char *argv[]) 63 { 64 struct sbuf *cmdbuf; 65 long arg_max; 66 int ch, debug, i, magic, n, nargs, offset, rval; 67 size_t cmdsize; 68 char *cmd, *name, *p, *shell, *slashp, *tmpshell; 69 70 debug = 0; 71 magic = '%'; /* Default magic char is `%'. */ 72 nargs = -1; 73 while ((ch = getopt(argc, argv, "a:d0123456789")) != -1) 74 switch (ch) { 75 case 'a': 76 if (optarg[1] != '\0') 77 errx(1, 78 "illegal magic character specification"); 79 magic = optarg[0]; 80 break; 81 case 'd': 82 debug = 1; 83 break; 84 case '0': case '1': case '2': case '3': case '4': 85 case '5': case '6': case '7': case '8': case '9': 86 if (nargs != -1) 87 errx(1, 88 "only one -# argument may be specified"); 89 nargs = optopt - '0'; 90 break; 91 default: 92 usage(); 93 } 94 argc -= optind; 95 argv += optind; 96 97 if (argc < 2) 98 usage(); 99 100 /* 101 * The command to run is argv[0], and the args are argv[1..]. 102 * Look for %digit references in the command, remembering the 103 * largest one. 104 */ 105 for (n = 0, p = argv[0]; *p != '\0'; ++p) 106 if (p[0] == magic && isdigit(p[1]) && p[1] != '0') { 107 ++p; 108 if (p[0] - '0' > n) 109 n = p[0] - '0'; 110 } 111 112 /* 113 * Figure out the shell and name arguments to pass to execl() 114 * in exec_shell(). Always malloc() shell and just set name 115 * to point at the last part of shell if there are any backslashes, 116 * otherwise just set it to point at the space malloc()'d. If 117 * SHELL environment variable exists, replace contents of 118 * shell with it. 119 */ 120 shell = name = NULL; 121 tmpshell = getenv("SHELL"); 122 shell = (tmpshell != NULL) ? strdup(tmpshell) : strdup(_PATH_BSHELL); 123 if (shell == NULL) 124 err(1, "strdup() failed"); 125 slashp = strrchr(shell, '/'); 126 name = (slashp != NULL) ? slashp + 1 : shell; 127 128 /* 129 * If there were any %digit references, then use those, otherwise 130 * build a new command string with sufficient %digit references at 131 * the end to consume (nargs) arguments each time round the loop. 132 * Allocate enough space to hold the maximum command. Save the 133 * size to pass to snprintf(). 134 */ 135 cmdsize = sizeof(EXEC) - 1 + strlen(argv[0]) 136 + 9 * (sizeof(" %1") - 1) + 1; 137 if ((cmd = malloc(cmdsize)) == NULL) 138 err(1, NULL); 139 140 if (n == 0) { 141 /* If nargs not set, default to a single argument. */ 142 if (nargs == -1) 143 nargs = 1; 144 145 p = cmd; 146 offset = snprintf(cmd, cmdsize, EXEC "%s", argv[0]); 147 if ((size_t)offset >= cmdsize) 148 errx(1, "snprintf() failed"); 149 p += offset; 150 cmdsize -= offset; 151 for (i = 1; i <= nargs; i++) { 152 offset = snprintf(p, cmdsize, " %c%d", magic, i); 153 if ((size_t)offset >= cmdsize) 154 errx(1, "snprintf() failed"); 155 p += offset; 156 cmdsize -= offset; 157 } 158 159 /* 160 * If nargs set to the special value 0, eat a single 161 * argument for each command execution. 162 */ 163 if (nargs == 0) 164 nargs = 1; 165 } else { 166 offset = snprintf(cmd, cmdsize, EXEC "%s", argv[0]); 167 if ((size_t)offset >= cmdsize) 168 errx(1, "snprintf() failed"); 169 nargs = n; 170 } 171 172 cmdbuf = sbuf_new(NULL, NULL, 1024, SBUF_AUTOEXTEND); 173 if (cmdbuf == NULL) 174 err(1, NULL); 175 176 arg_max = sysconf(_SC_ARG_MAX); 177 178 /* 179 * (argc) and (argv) are still offset by one to make it simpler to 180 * expand %digit references. At the end of the loop check for (argc) 181 * equals 1 means that all the (argv) has been consumed. 182 */ 183 for (rval = 0; argc > nargs; argc -= nargs, argv += nargs) { 184 sbuf_clear(cmdbuf); 185 /* Expand command argv references. */ 186 for (p = cmd; *p != '\0'; ++p) { 187 if (p[0] == magic && isdigit(p[1]) && p[1] != '0') { 188 if (sbuf_cat(cmdbuf, argv[(++p)[0] - '0']) 189 == -1) 190 errc(1, ENOMEM, "sbuf"); 191 } else { 192 if (sbuf_putc(cmdbuf, *p) == -1) 193 errc(1, ENOMEM, "sbuf"); 194 } 195 if (sbuf_len(cmdbuf) > arg_max) 196 errc(1, E2BIG, NULL); 197 } 198 199 /* Terminate the command string. */ 200 sbuf_finish(cmdbuf); 201 202 /* Run the command. */ 203 if (debug) 204 (void)printf("%s\n", sbuf_data(cmdbuf)); 205 else 206 if (exec_shell(sbuf_data(cmdbuf), shell, name)) 207 rval = 1; 208 } 209 210 if (argc != 1) 211 errx(1, "expecting additional argument%s after \"%s\"", 212 (nargs - argc) ? "s" : "", argv[argc - 1]); 213 free(cmd); 214 sbuf_delete(cmdbuf); 215 free(shell); 216 exit(rval); 217 } 218 219 /* 220 * exec_shell -- 221 * Execute a shell command using passed use_shell and use_name 222 * arguments. 223 */ 224 static int 225 exec_shell(const char *command, const char *use_shell, const char *use_name) 226 { 227 pid_t pid; 228 int omask, pstat; 229 sig_t intsave, quitsave; 230 231 if (!command) /* just checking... */ 232 return(1); 233 234 omask = sigblock(sigmask(SIGCHLD)); 235 switch(pid = vfork()) { 236 case -1: /* error */ 237 err(1, "vfork"); 238 case 0: /* child */ 239 (void)sigsetmask(omask); 240 execl(use_shell, use_name, "-c", command, (char *)NULL); 241 warn("%s", use_shell); 242 _exit(1); 243 } 244 intsave = signal(SIGINT, SIG_IGN); 245 quitsave = signal(SIGQUIT, SIG_IGN); 246 pid = waitpid(pid, &pstat, 0); 247 (void)sigsetmask(omask); 248 (void)signal(SIGINT, intsave); 249 (void)signal(SIGQUIT, quitsave); 250 return(pid == -1 ? -1 : pstat); 251 } 252 253 static void 254 usage(void) 255 { 256 257 (void)fprintf(stderr, 258 "usage: apply [-a magic] [-d] [-0123456789] command arguments ...\n"); 259 exit(1); 260 } 261