1 /* $NetBSD: apply.c,v 1.3 1995/03/25 03:38:23 glass 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 #ifndef lint 40 #if 0 41 static char sccsid[] = "@(#)apply.c 8.4 (Berkeley) 4/4/94"; 42 #else 43 static char rcsid[] = "$NetBSD: apply.c,v 1.3 1995/03/25 03:38:23 glass Exp $"; 44 #endif 45 #endif /* not lint */ 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 58 void usage __P((void)); 59 int system __P((const char *)); 60 61 int 62 main(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")) != EOF) 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]); 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 */ 194 int 195 system(command) 196 const char *command; 197 { 198 static char *name, *shell; 199 union wait pstat; 200 pid_t pid; 201 int omask; 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 = vfork()) { 217 case -1: /* error */ 218 err(1, "fork"); 219 case 0: /* child */ 220 (void)sigsetmask(omask); 221 execl(shell, name, "-c", command, NULL); 222 err(1, "%s", shell); 223 } 224 intsave = signal(SIGINT, SIG_IGN); 225 quitsave = signal(SIGQUIT, SIG_IGN); 226 pid = waitpid(pid, (int *)&pstat, 0); 227 (void)sigsetmask(omask); 228 (void)signal(SIGINT, intsave); 229 (void)signal(SIGQUIT, quitsave); 230 return(pid == -1 ? -1 : pstat.w_status); 231 } 232 233 void 234 usage() 235 { 236 237 (void)fprintf(stderr, 238 "usage: apply [-a magic] [-0123456789] command arguments ...\n"); 239 exit(1); 240 } 241