1 /* $NetBSD: apply.c,v 1.13 2004/01/05 23:23:34 jmmv Exp $ */ 2 3 /*- 4 * Copyright (c) 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Jan-Simon Pendry. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 #ifndef lint 37 #if 0 38 static char sccsid[] = "@(#)apply.c 8.4 (Berkeley) 4/4/94"; 39 #else 40 __RCSID("$NetBSD: apply.c,v 1.13 2004/01/05 23:23:34 jmmv Exp $"); 41 #endif 42 #endif /* not lint */ 43 44 #include <sys/wait.h> 45 46 #include <ctype.h> 47 #include <err.h> 48 #include <paths.h> 49 #include <signal.h> 50 #include <stdio.h> 51 #include <stdlib.h> 52 #include <string.h> 53 #include <unistd.h> 54 55 int main __P((int, char **)); 56 void usage __P((void)); 57 int shell_system __P((const char *)); 58 59 int 60 main(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, *nc; 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((unsigned char)p[1]) && 104 p[1] != '0') { 105 ++p; 106 if (p[0] - '0' > n) 107 n = p[0] - '0'; 108 } 109 110 /* 111 * If there were any %digit references, then use those, otherwise 112 * build a new command string with sufficient %digit references at 113 * the end to consume (nargs) arguments each time round the loop. 114 * Allocate enough space to hold the maximum command. 115 */ 116 if ((cmd = malloc(sizeof("exec ") - 1 + 117 strlen(argv[0]) + 9 * (sizeof(" %1") - 1) + 1)) == NULL) 118 err(1, "malloc"); 119 120 if (n == 0) { 121 /* If nargs not set, default to a single argument. */ 122 if (nargs == -1) 123 nargs = 1; 124 125 p = cmd; 126 p += sprintf(cmd, "exec %s", argv[0]); 127 for (i = 1; i <= nargs; i++) 128 p += sprintf(p, " %c%d", magic, i); 129 130 /* 131 * If nargs set to the special value 0, eat a single 132 * argument for each command execution. 133 */ 134 if (nargs == 0) 135 nargs = 1; 136 } else { 137 (void)sprintf(cmd, "exec %s", argv[0]); 138 nargs = n; 139 } 140 141 /* 142 * Grab some space in which to build the command. Allocate 143 * as necessary later, but no reason to build it up slowly 144 * for the normal case. 145 */ 146 if ((c = malloc(clen = 1024)) == NULL) 147 err(1, "malloc"); 148 149 /* 150 * (argc) and (argv) are still offset by one to make it simpler to 151 * expand %digit references. At the end of the loop check for (argc) 152 * equals 1 means that all the (argv) has been consumed. 153 */ 154 for (rval = 0; argc > nargs; argc -= nargs, argv += nargs) { 155 /* 156 * Find a max value for the command length, and ensure 157 * there's enough space to build it. 158 */ 159 for (l = strlen(cmd), i = 0; i < nargs; i++) 160 l += strlen(argv[i+1]); 161 if (l > clen) { 162 nc = realloc(c, l); 163 if (nc == NULL) 164 err(1, "malloc"); 165 c = nc; 166 clen = l; 167 } 168 169 /* Expand command argv references. */ 170 for (p = cmd, q = c; *p != '\0'; ++p) 171 if (p[0] == magic && isdigit((unsigned char)p[1]) && 172 p[1] != '0') 173 q += sprintf(q, "%s", argv[(++p)[0] - '0']); 174 else 175 *q++ = *p; 176 177 /* Terminate the command string. */ 178 *q = '\0'; 179 180 /* Run the command. */ 181 if (debug) 182 (void)printf("%s\n", c); 183 else 184 if (shell_system(c)) 185 rval = 1; 186 } 187 188 if (argc != 1) 189 errx(1, "expecting additional argument%s after \"%s\"", 190 (nargs - argc) ? "s" : "", argv[argc - 1]); 191 exit(rval); 192 } 193 194 /* 195 * shell_system -- 196 * Private version of system(3). Use the user's SHELL environment 197 * variable as the shell to execute. 198 */ 199 int 200 shell_system(command) 201 const char *command; 202 { 203 static char *name, *shell; 204 int status; 205 pid_t pid; 206 int omask; 207 sig_t intsave, quitsave; 208 209 if (shell == NULL) { 210 if ((shell = getenv("SHELL")) == NULL) 211 shell = _PATH_BSHELL; 212 if ((name = strrchr(shell, '/')) == NULL) 213 name = shell; 214 else 215 ++name; 216 } 217 if (!command) /* just checking... */ 218 return(1); 219 220 omask = sigblock(sigmask(SIGCHLD)); 221 switch(pid = vfork()) { 222 case -1: /* error */ 223 err(1, "vfork"); 224 case 0: /* child */ 225 (void)sigsetmask(omask); 226 execl(shell, name, "-c", command, NULL); 227 warn("%s", shell); 228 _exit(1); 229 } 230 intsave = signal(SIGINT, SIG_IGN); 231 quitsave = signal(SIGQUIT, SIG_IGN); 232 pid = waitpid(pid, &status, 0); 233 (void)sigsetmask(omask); 234 (void)signal(SIGINT, intsave); 235 (void)signal(SIGQUIT, quitsave); 236 return(pid == -1 ? -1 : status); 237 } 238 239 void 240 usage() 241 { 242 243 (void)fprintf(stderr, 244 "usage: %s [-a magic] [-0123456789] command arguments ...\n", 245 getprogname()); 246 exit(1); 247 } 248