apply.c revision 60706
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 60706 2000-05-19 09:42:53Z kris $"; 43#endif /* not lint */ 44 45#include <sys/wait.h> 46 47#include <ctype.h> 48#include <err.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 56void usage __P((void)); 57int system __P((const char *)); 58 59int 60main(argc, argv) 61 int argc; 62 char *argv[]; 63{ 64 int ch, clen, debug, i, l, magic, n, nargs, rval; 65 char *c, *cmd, *p, *q; 66 67 debug = 0; 68 magic = '%'; /* Default magic char is `%'. */ 69 nargs = -1; 70 while ((ch = getopt(argc, argv, "a:d0123456789")) != -1) 71 switch (ch) { 72 case 'a': 73 if (optarg[1] != '\0') 74 errx(1, 75 "illegal magic character specification"); 76 magic = optarg[0]; 77 break; 78 case 'd': 79 debug = 1; 80 break; 81 case '0': case '1': case '2': case '3': case '4': 82 case '5': case '6': case '7': case '8': case '9': 83 if (nargs != -1) 84 errx(1, 85 "only one -# argument may be specified"); 86 nargs = optopt - '0'; 87 break; 88 default: 89 usage(); 90 } 91 argc -= optind; 92 argv += optind; 93 94 if (argc < 2) 95 usage(); 96 97 /* 98 * The command to run is argv[0], and the args are argv[1..]. 99 * Look for %digit references in the command, remembering the 100 * largest one. 101 */ 102 for (n = 0, p = argv[0]; *p != '\0'; ++p) 103 if (p[0] == magic && isdigit(p[1]) && p[1] != '0') { 104 ++p; 105 if (p[0] - '0' > n) 106 n = p[0] - '0'; 107 } 108 109 /* 110 * If there were any %digit references, then use those, otherwise 111 * build a new command string with sufficient %digit references at 112 * the end to consume (nargs) arguments each time round the loop. 113 * Allocate enough space to hold the maximum command. 114 */ 115 if ((cmd = malloc(sizeof("exec ") - 1 + 116 strlen(argv[0]) + 9 * (sizeof(" %1") - 1) + 1)) == NULL) 117 err(1, NULL); 118 119 if (n == 0) { 120 /* If nargs not set, default to a single argument. */ 121 if (nargs == -1) 122 nargs = 1; 123 124 p = cmd; 125 p += sprintf(cmd, "exec %s", argv[0]); 126 for (i = 1; i <= nargs; i++) 127 p += sprintf(p, " %c%d", magic, i); 128 129 /* 130 * If nargs set to the special value 0, eat a single 131 * argument for each command execution. 132 */ 133 if (nargs == 0) 134 nargs = 1; 135 } else { 136 (void)sprintf(cmd, "exec %s", argv[0]); 137 nargs = n; 138 } 139 140 /* 141 * Grab some space in which to build the command. Allocate 142 * as necessary later, but no reason to build it up slowly 143 * for the normal case. 144 */ 145 if ((c = malloc(clen = 1024)) == NULL) 146 err(1, NULL); 147 148 /* 149 * (argc) and (argv) are still offset by one to make it simpler to 150 * expand %digit references. At the end of the loop check for (argc) 151 * equals 1 means that all the (argv) has been consumed. 152 */ 153 for (rval = 0; argc > nargs; argc -= nargs, argv += nargs) { 154 /* 155 * Find a max value for the command length, and ensure 156 * there's enough space to build it. 157 */ 158 for (l = strlen(cmd), i = 0; i < nargs; i++) 159 l += strlen(argv[i+1]); 160 if (l > clen && (c = realloc(c, clen = l)) == NULL) 161 err(1, NULL); 162 163 /* Expand command argv references. */ 164 for (p = cmd, q = c; *p != '\0'; ++p) 165 if (p[0] == magic && isdigit(p[1]) && p[1] != '0') 166 q += sprintf(q, "%s", argv[(++p)[0] - '0']); 167 else 168 *q++ = *p; 169 170 /* Terminate the command string. */ 171 *q = '\0'; 172 173 /* Run the command. */ 174 if (debug) 175 (void)printf("%s\n", c); 176 else 177 if (system(c)) 178 rval = 1; 179 } 180 181 if (argc != 1) 182 errx(1, "expecting additional argument%s after \"%s\"", 183 (nargs - argc) ? "s" : "", argv[argc - 1]); 184 exit(rval); 185} 186 187/* 188 * system -- 189 * Private version of system(3). Use the user's SHELL environment 190 * variable as the shell to execute. 191 */ 192int 193system(command) 194 const char *command; 195{ 196 static char *name, *shell; 197 pid_t pid; 198 int omask, pstat; 199 sig_t intsave, quitsave; 200 201 if (shell == NULL) { 202 if ((shell = getenv("SHELL")) == NULL) 203 shell = _PATH_BSHELL; 204 if ((name = strrchr(shell, '/')) == NULL) 205 name = shell; 206 else 207 ++name; 208 } 209 if (!command) /* just checking... */ 210 return(1); 211 212 omask = sigblock(sigmask(SIGCHLD)); 213 switch(pid = vfork()) { 214 case -1: /* error */ 215 err(1, "vfork"); 216 case 0: /* child */ 217 (void)sigsetmask(omask); 218 execl(shell, name, "-c", command, NULL); 219 warn("%s", shell); 220 _exit(1); 221 } 222 intsave = signal(SIGINT, SIG_IGN); 223 quitsave = signal(SIGQUIT, SIG_IGN); 224 pid = waitpid(pid, &pstat, 0); 225 (void)sigsetmask(omask); 226 (void)signal(SIGINT, intsave); 227 (void)signal(SIGQUIT, quitsave); 228 return(pid == -1 ? -1 : pstat); 229} 230 231void 232usage() 233{ 234 235 (void)fprintf(stderr, 236 "usage: apply [-a magic] [-d] [-0123456789] command arguments ...\n"); 237 exit(1); 238} 239