1 /* $OpenBSD: apply.c,v 1.9 2001/07/09 07:04:47 deraadt Exp $ */ 2 /* $NetBSD: apply.c,v 1.3 1995/03/25 03:38:23 glass Exp $ */ 3 4 /*- 5 * Copyright (c) 1994 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * Jan-Simon Pendry. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the University of 22 * California, Berkeley and its contributors. 23 * 4. Neither the name of the University nor the names of its contributors 24 * may be used to endorse or promote products derived from this software 25 * without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 * SUCH DAMAGE. 38 */ 39 40 #ifndef lint 41 #if 0 42 static char sccsid[] = "@(#)apply.c 8.4 (Berkeley) 4/4/94"; 43 #else 44 static char rcsid[] = "$OpenBSD: apply.c,v 1.9 2001/07/09 07:04:47 deraadt 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 void usage __P((void)); 60 int system __P((const char *)); 61 62 int 63 main(argc, argv) 64 int argc; 65 char *argv[]; 66 { 67 int ch, clen, debug, i, l, magic, n, nargs, rval; 68 char *c, *cmd, *p, *q; 69 70 debug = 0; 71 magic = '%'; /* Default magic char is `%'. */ 72 nargs = -1; 73 while ((ch = getopt(argc, argv, "a:d0123456789")) != -1) 74 switch (ch) { 75 case 'a': 76 if (optarg[1] != '\0') 77 errx(1, 78 "illegal magic character specification."); 79 magic = optarg[0]; 80 break; 81 case 'd': 82 debug = 1; 83 break; 84 case '0': case '1': case '2': case '3': case '4': 85 case '5': case '6': case '7': case '8': case '9': 86 if (nargs != -1) 87 errx(1, 88 "only one -# argument may be specified."); 89 nargs = optopt - '0'; 90 break; 91 default: 92 usage(); 93 } 94 argc -= optind; 95 argv += optind; 96 97 if (argc < 2) 98 usage(); 99 100 /* 101 * The command to run is argv[0], and the args are argv[1..]. 102 * Look for %digit references in the command, remembering the 103 * largest one. 104 */ 105 for (n = 0, p = argv[0]; *p != '\0'; ++p) 106 if (p[0] == magic && isdigit(p[1]) && p[1] != '0') { 107 ++p; 108 if (p[0] - '0' > n) 109 n = p[0] - '0'; 110 } 111 112 /* 113 * If there were any %digit references, then use those, otherwise 114 * build a new command string with sufficient %digit references at 115 * the end to consume (nargs) arguments each time round the loop. 116 * Allocate enough space to hold the maximum command. 117 */ 118 if ((cmd = malloc(sizeof("exec ") - 1 + 119 strlen(argv[0]) + 9 * (sizeof(" %1") - 1) + 1)) == NULL) 120 err(1, NULL); 121 122 if (n == 0) { 123 /* If nargs not set, default to a single argument. */ 124 if (nargs == -1) 125 nargs = 1; 126 127 p = cmd; 128 p += sprintf(cmd, "exec %s", argv[0]); 129 for (i = 1; i <= nargs; i++) 130 p += sprintf(p, " %c%d", magic, i); 131 132 /* 133 * If nargs set to the special value 0, eat a single 134 * argument for each command execution. 135 */ 136 if (nargs == 0) 137 nargs = 1; 138 } else { 139 (void)sprintf(cmd, "exec %s", argv[0]); 140 nargs = n; 141 } 142 143 /* 144 * Grab some space in which to build the command. Allocate 145 * as necessary later, but no reason to build it up slowly 146 * for the normal case. 147 */ 148 if ((c = malloc(clen = 1024)) == NULL) 149 err(1, NULL); 150 151 /* 152 * (argc) and (argv) are still offset by one to make it simpler to 153 * expand %digit references. At the end of the loop check for (argc) 154 * equals 1 means that all the (argv) has been consumed. 155 */ 156 for (rval = 0; argc > nargs; argc -= nargs, argv += nargs) { 157 /* 158 * Find a max value for the command length, and ensure 159 * there's enough space to build it. 160 */ 161 for (l = strlen(cmd), i = 0; i < nargs; i++) 162 l += strlen(argv[i+1]); 163 if (l > clen && (c = realloc(c, clen = l)) == NULL) 164 err(1, NULL); 165 166 /* Expand command argv references. */ 167 for (p = cmd, q = c; *p != '\0'; ++p) 168 if (p[0] == magic && isdigit(p[1]) && p[1] != '0') 169 q += sprintf(q, "%s", argv[(++p)[0] - '0']); 170 else 171 *q++ = *p; 172 173 /* Terminate the command string. */ 174 *q = '\0'; 175 176 /* Run the command. */ 177 if (debug) 178 (void)printf("%s\n", c); 179 else 180 if (system(c)) 181 rval = 1; 182 } 183 184 if (argc != 1) 185 errx(1, "expecting additional argument%s after \"%s\"", 186 (nargs - argc) ? "s" : "", argv[argc - 1]); 187 exit(rval); 188 } 189 190 /* 191 * system -- 192 * Private version of system(3). Use the user's SHELL environment 193 * variable as the shell to execute. 194 */ 195 int 196 system(command) 197 const char *command; 198 { 199 static char *name, *shell; 200 pid_t pid; 201 int omask, pstat; 202 sig_t intsave, quitsave; 203 204 if (shell == NULL) { 205 if ((shell = getenv("SHELL")) == NULL) 206 shell = _PATH_BSHELL; 207 if ((name = strrchr(shell, '/')) == NULL) 208 name = shell; 209 else 210 ++name; 211 } 212 if (!command) /* just checking... */ 213 return(1); 214 215 omask = sigblock(sigmask(SIGCHLD)); 216 switch(pid = fork()) { 217 case -1: /* error */ 218 err(1, "fork"); 219 case 0: /* child */ 220 (void)sigsetmask(omask); 221 execl(shell, name, "-c", command, (char *)NULL); 222 err(1, "%s", shell); 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 } 232 233 void 234 usage() 235 { 236 (void)fprintf(stderr, 237 "usage: apply [-#] [-a magic] [-d] command argument [...]\n"); 238 exit(1); 239 } 240