apply.c revision 67189
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#ifndef lint 38#if 0 39static const char sccsid[] = "@(#)apply.c 8.4 (Berkeley) 4/4/94"; 40#endif 41static const char rcsid[] = 42 "$FreeBSD: head/usr.bin/apply/apply.c 67189 2000-10-16 08:13:59Z brian $"; 43#endif /* not lint */ 44 45#include <sys/types.h> 46 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 58void usage __P((void)); 59int system __P((const char *)); 60 61int 62main(argc, argv) 63 int argc; 64 char *argv[]; 65{ 66 int ch, clen, debug, i, l, magic, n, nargs, rval; 67 char *c, *cmd, *p, *q; 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 * If there were any %digit references, then use those, otherwise 113 * build a new command string with sufficient %digit references at 114 * the end to consume (nargs) arguments each time round the loop. 115 * Allocate enough space to hold the maximum command. 116 */ 117 if ((cmd = malloc(sizeof("exec ") - 1 + 118 strlen(argv[0]) + 9 * (sizeof(" %1") - 1) + 1)) == NULL) 119 err(1, NULL); 120 121 if (n == 0) { 122 /* If nargs not set, default to a single argument. */ 123 if (nargs == -1) 124 nargs = 1; 125 126 p = cmd; 127 p += sprintf(cmd, "exec %s", argv[0]); 128 for (i = 1; i <= nargs; i++) 129 p += sprintf(p, " %c%d", magic, i); 130 131 /* 132 * If nargs set to the special value 0, eat a single 133 * argument for each command execution. 134 */ 135 if (nargs == 0) 136 nargs = 1; 137 } else { 138 (void)sprintf(cmd, "exec %s", argv[0]); 139 nargs = n; 140 } 141 142 /* 143 * Grab some space in which to build the command. Allocate 144 * as necessary later, but no reason to build it up slowly 145 * for the normal case. 146 */ 147 if ((c = malloc(clen = 1024)) == NULL) 148 err(1, NULL); 149 150 /* 151 * (argc) and (argv) are still offset by one to make it simpler to 152 * expand %digit references. At the end of the loop check for (argc) 153 * equals 1 means that all the (argv) has been consumed. 154 */ 155 for (rval = 0; argc > nargs; argc -= nargs, argv += nargs) { 156 /* 157 * Find a max value for the command length, and ensure 158 * there's enough space to build it. 159 */ 160 for (l = strlen(cmd), i = 0; i < nargs; i++) 161 l += strlen(argv[i+1]); 162 if (l > clen && (c = realloc(c, clen = l)) == NULL) 163 err(1, NULL); 164 165 /* Expand command argv references. */ 166 for (p = cmd, q = c; *p != '\0'; ++p) 167 if (p[0] == magic && isdigit(p[1]) && p[1] != '0') 168 q += sprintf(q, "%s", argv[(++p)[0] - '0']); 169 else 170 *q++ = *p; 171 172 /* Terminate the command string. */ 173 *q = '\0'; 174 175 /* Run the command. */ 176 if (debug) 177 (void)printf("%s\n", c); 178 else 179 if (system(c)) 180 rval = 1; 181 } 182 183 if (argc != 1) 184 errx(1, "expecting additional argument%s after \"%s\"", 185 (nargs - argc) ? "s" : "", argv[argc - 1]); 186 exit(rval); 187} 188 189/* 190 * system -- 191 * Private version of system(3). Use the user's SHELL environment 192 * variable as the shell to execute. 193 */ 194int 195system(command) 196 const char *command; 197{ 198 static char *name, *shell; 199 pid_t pid; 200 int omask, pstat; 201 sig_t intsave, quitsave; 202 203 if (shell == NULL) { 204 if ((shell = getenv("SHELL")) == NULL) 205 shell = _PATH_BSHELL; 206 if ((name = strrchr(shell, '/')) == NULL) 207 name = shell; 208 else 209 ++name; 210 } 211 if (!command) /* just checking... */ 212 return(1); 213 214 omask = sigblock(sigmask(SIGCHLD)); 215 switch(pid = vfork()) { 216 case -1: /* error */ 217 err(1, "vfork"); 218 case 0: /* child */ 219 (void)sigsetmask(omask); 220 execl(shell, name, "-c", command, NULL); 221 warn("%s", shell); 222 _exit(1); 223 } 224 intsave = signal(SIGINT, SIG_IGN); 225 quitsave = signal(SIGQUIT, SIG_IGN); 226 pid = waitpid(pid, &pstat, 0); 227 (void)sigsetmask(omask); 228 (void)signal(SIGINT, intsave); 229 (void)signal(SIGQUIT, quitsave); 230 return(pid == -1 ? -1 : pstat); 231} 232 233void 234usage() 235{ 236 237 (void)fprintf(stderr, 238 "usage: apply [-a magic] [-d] [-0123456789] command arguments ...\n"); 239 exit(1); 240} 241