1 /* $NetBSD: apply.c,v 1.10 2001/02/19 23:03:42 cgd 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. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 */ 38 39 #include <sys/cdefs.h> 40 #ifndef lint 41 #if 0 42 static char sccsid[] = "@(#)apply.c 8.4 (Berkeley) 4/4/94"; 43 #else 44 __RCSID("$NetBSD: apply.c,v 1.10 2001/02/19 23:03:42 cgd Exp $"); 45 #endif 46 #endif /* not lint */ 47 48 #include <sys/wait.h> 49 50 #include <ctype.h> 51 #include <err.h> 52 #include <paths.h> 53 #include <signal.h> 54 #include <stdio.h> 55 #include <stdlib.h> 56 #include <string.h> 57 #include <unistd.h> 58 59 int main __P((int, char **)); 60 void usage __P((void)); 61 int shell_system __P((const char *)); 62 63 int 64 main(argc, argv) 65 int argc; 66 char *argv[]; 67 { 68 int ch, clen, debug, i, l, magic, n, nargs, rval; 69 char *c, *cmd, *p, *q; 70 71 debug = 0; 72 magic = '%'; /* Default magic char is `%'. */ 73 nargs = -1; 74 while ((ch = getopt(argc, argv, "a:d0123456789")) != -1) 75 switch (ch) { 76 case 'a': 77 if (optarg[1] != '\0') 78 errx(1, 79 "illegal magic character specification."); 80 magic = optarg[0]; 81 break; 82 case 'd': 83 debug = 1; 84 break; 85 case '0': case '1': case '2': case '3': case '4': 86 case '5': case '6': case '7': case '8': case '9': 87 if (nargs != -1) 88 errx(1, 89 "only one -# argument may be specified."); 90 nargs = optopt - '0'; 91 break; 92 default: 93 usage(); 94 } 95 argc -= optind; 96 argv += optind; 97 98 if (argc < 2) 99 usage(); 100 101 /* 102 * The command to run is argv[0], and the args are argv[1..]. 103 * Look for %digit references in the command, remembering the 104 * largest one. 105 */ 106 for (n = 0, p = argv[0]; *p != '\0'; ++p) 107 if (p[0] == magic && isdigit((unsigned char)p[1]) && 108 p[1] != '0') { 109 ++p; 110 if (p[0] - '0' > n) 111 n = p[0] - '0'; 112 } 113 114 /* 115 * If there were any %digit references, then use those, otherwise 116 * build a new command string with sufficient %digit references at 117 * the end to consume (nargs) arguments each time round the loop. 118 * Allocate enough space to hold the maximum command. 119 */ 120 if ((cmd = malloc(sizeof("exec ") - 1 + 121 strlen(argv[0]) + 9 * (sizeof(" %1") - 1) + 1)) == NULL) 122 err(1, "malloc"); 123 124 if (n == 0) { 125 /* If nargs not set, default to a single argument. */ 126 if (nargs == -1) 127 nargs = 1; 128 129 p = cmd; 130 p += sprintf(cmd, "exec %s", argv[0]); 131 for (i = 1; i <= nargs; i++) 132 p += sprintf(p, " %c%d", magic, i); 133 134 /* 135 * If nargs set to the special value 0, eat a single 136 * argument for each command execution. 137 */ 138 if (nargs == 0) 139 nargs = 1; 140 } else { 141 (void)sprintf(cmd, "exec %s", argv[0]); 142 nargs = n; 143 } 144 145 /* 146 * Grab some space in which to build the command. Allocate 147 * as necessary later, but no reason to build it up slowly 148 * for the normal case. 149 */ 150 if ((c = malloc(clen = 1024)) == NULL) 151 err(1, "malloc"); 152 153 /* 154 * (argc) and (argv) are still offset by one to make it simpler to 155 * expand %digit references. At the end of the loop check for (argc) 156 * equals 1 means that all the (argv) has been consumed. 157 */ 158 for (rval = 0; argc > nargs; argc -= nargs, argv += nargs) { 159 /* 160 * Find a max value for the command length, and ensure 161 * there's enough space to build it. 162 */ 163 for (l = strlen(cmd), i = 0; i < nargs; i++) 164 l += strlen(argv[i+1]); 165 if (l > clen && (c = realloc(c, clen = l)) == NULL) 166 err(1, "malloc"); 167 168 /* Expand command argv references. */ 169 for (p = cmd, q = c; *p != '\0'; ++p) 170 if (p[0] == magic && isdigit((unsigned char)p[1]) && 171 p[1] != '0') 172 q += sprintf(q, "%s", argv[(++p)[0] - '0']); 173 else 174 *q++ = *p; 175 176 /* Terminate the command string. */ 177 *q = '\0'; 178 179 /* Run the command. */ 180 if (debug) 181 (void)printf("%s\n", c); 182 else 183 if (shell_system(c)) 184 rval = 1; 185 } 186 187 if (argc != 1) 188 errx(1, "expecting additional argument%s after \"%s\"", 189 (nargs - argc) ? "s" : "", argv[argc - 1]); 190 exit(rval); 191 } 192 193 /* 194 * shell_system -- 195 * Private version of system(3). Use the user's SHELL environment 196 * variable as the shell to execute. 197 */ 198 int 199 shell_system(command) 200 const char *command; 201 { 202 static char *name, *shell; 203 int status; 204 pid_t pid; 205 int omask; 206 sig_t intsave, quitsave; 207 208 if (shell == NULL) { 209 if ((shell = getenv("SHELL")) == NULL) 210 shell = _PATH_BSHELL; 211 if ((name = strrchr(shell, '/')) == NULL) 212 name = shell; 213 else 214 ++name; 215 } 216 if (!command) /* just checking... */ 217 return(1); 218 219 omask = sigblock(sigmask(SIGCHLD)); 220 switch(pid = vfork()) { 221 case -1: /* error */ 222 err(1, "vfork"); 223 case 0: /* child */ 224 (void)sigsetmask(omask); 225 execl(shell, name, "-c", command, NULL); 226 warn("%s", shell); 227 _exit(1); 228 } 229 intsave = signal(SIGINT, SIG_IGN); 230 quitsave = signal(SIGQUIT, SIG_IGN); 231 pid = waitpid(pid, &status, 0); 232 (void)sigsetmask(omask); 233 (void)signal(SIGINT, intsave); 234 (void)signal(SIGQUIT, quitsave); 235 return(pid == -1 ? -1 : status); 236 } 237 238 void 239 usage() 240 { 241 242 (void)fprintf(stderr, 243 "Usage: %s [-a magic] [-0123456789] command arguments ...\n", 244 getprogname()); 245 exit(1); 246 } 247