apply.c revision 87231
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#include <sys/cdefs.h> 38 39__FBSDID("$FreeBSD: head/usr.bin/apply/apply.c 87231 2001-12-02 20:40:22Z markm $"); 40 41#ifndef lint 42static const char sccsid[] = "@(#)apply.c 8.4 (Berkeley) 4/4/94"; 43#endif 44 45#include <sys/types.h> 46#include <sys/wait.h> 47 48#include <ctype.h> 49#include <err.h> 50#include <paths.h> 51#include <signal.h> 52#include <stdio.h> 53#include <stdlib.h> 54#include <string.h> 55#include <unistd.h> 56 57#define EXEC "exec " 58 59static int exec_shell(const char *, char *, char *); 60static void usage(void); 61 62int 63main(int argc, char *argv[]) { 64 int ch, debug, i, magic, n, nargs, offset, rval; 65 size_t clen, cmdsize, l; 66 char *c, *cmd, *name, *p, *q, *shell, *slashp, *tmpshell; 67 68 debug = 0; 69 magic = '%'; /* Default magic char is `%'. */ 70 nargs = -1; 71 while ((ch = getopt(argc, argv, "a:d0123456789")) != -1) 72 switch (ch) { 73 case 'a': 74 if (optarg[1] != '\0') 75 errx(1, 76 "illegal magic character specification"); 77 magic = optarg[0]; 78 break; 79 case 'd': 80 debug = 1; 81 break; 82 case '0': case '1': case '2': case '3': case '4': 83 case '5': case '6': case '7': case '8': case '9': 84 if (nargs != -1) 85 errx(1, 86 "only one -# argument may be specified"); 87 nargs = optopt - '0'; 88 break; 89 default: 90 usage(); 91 } 92 argc -= optind; 93 argv += optind; 94 95 if (argc < 2) 96 usage(); 97 98 /* 99 * The command to run is argv[0], and the args are argv[1..]. 100 * Look for %digit references in the command, remembering the 101 * largest one. 102 */ 103 for (n = 0, p = argv[0]; *p != '\0'; ++p) 104 if (p[0] == magic && isdigit(p[1]) && p[1] != '0') { 105 ++p; 106 if (p[0] - '0' > n) 107 n = p[0] - '0'; 108 } 109 110 /* 111 * Figure out the shell and name arguments to pass to execl() 112 * in exec_shell(). Always malloc() shell and just set name 113 * to point at the last part of shell if there are any backslashes, 114 * otherwise just set it to point at the space malloc()'d. If 115 * SHELL environment variable exists, replace contents of 116 * shell with it. 117 */ 118 shell = name = NULL; 119 tmpshell = getenv("SHELL"); 120 shell = (tmpshell != NULL) ? strdup(tmpshell) : strdup(_PATH_BSHELL); 121 if (shell == NULL) 122 err(1, "strdup() failed"); 123 slashp = strrchr(shell, '/'); 124 name = (slashp != NULL) ? slashp + 1 : shell; 125 126 /* 127 * If there were any %digit references, then use those, otherwise 128 * build a new command string with sufficient %digit references at 129 * the end to consume (nargs) arguments each time round the loop. 130 * Allocate enough space to hold the maximum command. Save the 131 * size to pass to snprintf(). 132 */ 133 cmdsize = sizeof(EXEC) - 1 + strlen(argv[0]) 134 + 9 * (sizeof(" %1") - 1) + 1; 135 if ((cmd = malloc(cmdsize)) == NULL) 136 err(1, NULL); 137 138 if (n == 0) { 139 /* If nargs not set, default to a single argument. */ 140 if (nargs == -1) 141 nargs = 1; 142 143 p = cmd; 144 offset = snprintf(cmd, cmdsize, EXEC "%s", argv[0]); 145 if ((size_t)offset >= cmdsize) 146 err(1, "snprintf() failed"); 147 p += offset; 148 cmdsize -= offset; 149 for (i = 1; i <= nargs; i++) { 150 offset = snprintf(p, cmdsize, " %c%d", magic, i); 151 if ((size_t)offset >= cmdsize) 152 err(1, "snprintf() failed"); 153 p += offset; 154 cmdsize -= offset; 155 } 156 157 /* 158 * If nargs set to the special value 0, eat a single 159 * argument for each command execution. 160 */ 161 if (nargs == 0) 162 nargs = 1; 163 } else { 164 offset = snprintf(cmd, cmdsize, EXEC "%s", argv[0]); 165 if ((size_t)offset >= cmdsize) 166 err(1, "snprintf() failed"); 167 nargs = n; 168 } 169 170 /* 171 * Grab some space in which to build the command. Allocate 172 * as necessary later, but no reason to build it up slowly 173 * for the normal case. 174 */ 175 if ((c = malloc(clen = 1024)) == NULL) 176 err(1, NULL); 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 /* 185 * Find a max value for the command length, and ensure 186 * there's enough space to build it. 187 */ 188 for (l = strlen(cmd), i = 0; i < nargs; i++) 189 l += strlen(argv[i+1]); 190 if (l > clen && (c = realloc(c, clen = l)) == NULL) 191 err(1, NULL); 192 193 /* Expand command argv references. */ 194 for (p = cmd, q = c; *p != '\0'; ++p) 195 if (p[0] == magic && isdigit(p[1]) && p[1] != '0') { 196 offset = snprintf(q, l, "%s", 197 argv[(++p)[0] - '0']); 198 if ((size_t)offset >= l) 199 err(1, "snprintf() failed"); 200 q += offset; 201 l -= offset; 202 } else 203 *q++ = *p; 204 205 /* Terminate the command string. */ 206 *q = '\0'; 207 208 /* Run the command. */ 209 if (debug) 210 (void)printf("%s\n", c); 211 else 212 if (exec_shell(c, shell, name)) 213 rval = 1; 214 } 215 216 if (argc != 1) 217 errx(1, "expecting additional argument%s after \"%s\"", 218 (nargs - argc) ? "s" : "", argv[argc - 1]); 219 free(cmd); 220 free(c); 221 free(shell); 222 exit(rval); 223} 224 225/* 226 * exec_shell -- 227 * Execute a shell command using passed use_shell and use_name 228 * arguments. 229 */ 230static int 231exec_shell(const char *command, char *use_shell, char *use_name) 232{ 233 pid_t pid; 234 int omask, pstat; 235 sig_t intsave, quitsave; 236 237 if (!command) /* just checking... */ 238 return(1); 239 240 omask = sigblock(sigmask(SIGCHLD)); 241 switch(pid = vfork()) { 242 case -1: /* error */ 243 err(1, "vfork"); 244 case 0: /* child */ 245 (void)sigsetmask(omask); 246 execl(use_shell, use_name, "-c", command, (char *)NULL); 247 warn("%s", use_shell); 248 _exit(1); 249 } 250 intsave = signal(SIGINT, SIG_IGN); 251 quitsave = signal(SIGQUIT, SIG_IGN); 252 pid = waitpid(pid, &pstat, 0); 253 (void)sigsetmask(omask); 254 (void)signal(SIGINT, intsave); 255 (void)signal(SIGQUIT, quitsave); 256 return(pid == -1 ? -1 : pstat); 257} 258 259void 260usage() 261{ 262 263 (void)fprintf(stderr, 264 "usage: apply [-a magic] [-d] [-0123456789] command arguments ...\n"); 265 exit(1); 266} 267