apply.c revision 24360
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 38static char sccsid[] = "@(#)apply.c 8.4 (Berkeley) 4/4/94"; 39#endif /* not lint */ 40 41#include <sys/wait.h> 42 43#include <ctype.h> 44#include <err.h> 45#include <paths.h> 46#include <signal.h> 47#include <stdio.h> 48#include <stdlib.h> 49#include <string.h> 50#include <unistd.h> 51 52void usage __P((void)); 53int system __P((const char *)); 54 55int 56main(argc, argv) 57 int argc; 58 char *argv[]; 59{ 60 int ch, clen, debug, i, l, magic, n, nargs, rval; 61 char *c, *cmd, *p, *q; 62 63 debug = 0; 64 magic = '%'; /* Default magic char is `%'. */ 65 nargs = -1; 66 while ((ch = getopt(argc, argv, "a:d0123456789")) != -1) 67 switch (ch) { 68 case 'a': 69 if (optarg[1] != '\0') 70 errx(1, 71 "illegal magic character specification."); 72 magic = optarg[0]; 73 break; 74 case 'd': 75 debug = 1; 76 break; 77 case '0': case '1': case '2': case '3': case '4': 78 case '5': case '6': case '7': case '8': case '9': 79 if (nargs != -1) 80 errx(1, 81 "only one -# argument may be specified."); 82 nargs = optopt - '0'; 83 break; 84 default: 85 usage(); 86 } 87 argc -= optind; 88 argv += optind; 89 90 if (argc < 2) 91 usage(); 92 93 /* 94 * The command to run is argv[0], and the args are argv[1..]. 95 * Look for %digit references in the command, remembering the 96 * largest one. 97 */ 98 for (n = 0, p = argv[0]; *p != '\0'; ++p) 99 if (p[0] == magic && isdigit(p[1]) && p[1] != '0') { 100 ++p; 101 if (p[0] - '0' > n) 102 n = p[0] - '0'; 103 } 104 105 /* 106 * If there were any %digit references, then use those, otherwise 107 * build a new command string with sufficient %digit references at 108 * the end to consume (nargs) arguments each time round the loop. 109 * Allocate enough space to hold the maximum command. 110 */ 111 if ((cmd = malloc(sizeof("exec ") - 1 + 112 strlen(argv[0]) + 9 * (sizeof(" %1") - 1) + 1)) == NULL) 113 err(1, NULL); 114 115 if (n == 0) { 116 /* If nargs not set, default to a single argument. */ 117 if (nargs == -1) 118 nargs = 1; 119 120 p = cmd; 121 p += sprintf(cmd, "exec %s", argv[0]); 122 for (i = 1; i <= nargs; i++) 123 p += sprintf(p, " %c%d", magic, i); 124 125 /* 126 * If nargs set to the special value 0, eat a single 127 * argument for each command execution. 128 */ 129 if (nargs == 0) 130 nargs = 1; 131 } else { 132 (void)sprintf(cmd, "exec %s", argv[0]); 133 nargs = n; 134 } 135 136 /* 137 * Grab some space in which to build the command. Allocate 138 * as necessary later, but no reason to build it up slowly 139 * for the normal case. 140 */ 141 if ((c = malloc(clen = 1024)) == NULL) 142 err(1, NULL); 143 144 /* 145 * (argc) and (argv) are still offset by one to make it simpler to 146 * expand %digit references. At the end of the loop check for (argc) 147 * equals 1 means that all the (argv) has been consumed. 148 */ 149 for (rval = 0; argc > nargs; argc -= nargs, argv += nargs) { 150 /* 151 * Find a max value for the command length, and ensure 152 * there's enough space to build it. 153 */ 154 for (l = strlen(cmd), i = 0; i < nargs; i++) 155 l += strlen(argv[i]); 156 if (l > clen && (c = realloc(c, clen = l)) == NULL) 157 err(1, NULL); 158 159 /* Expand command argv references. */ 160 for (p = cmd, q = c; *p != '\0'; ++p) 161 if (p[0] == magic && isdigit(p[1]) && p[1] != '0') 162 q += sprintf(q, "%s", argv[(++p)[0] - '0']); 163 else 164 *q++ = *p; 165 166 /* Terminate the command string. */ 167 *q = '\0'; 168 169 /* Run the command. */ 170 if (debug) 171 (void)printf("%s\n", c); 172 else 173 if (system(c)) 174 rval = 1; 175 } 176 177 if (argc != 1) 178 errx(1, "expecting additional argument%s after \"%s\"", 179 (nargs - argc) ? "s" : "", argv[argc - 1]); 180 exit(rval); 181} 182 183/* 184 * system -- 185 * Private version of system(3). Use the user's SHELL environment 186 * variable as the shell to execute. 187 */ 188int 189system(command) 190 const char *command; 191{ 192 static char *name, *shell; 193 union wait pstat; 194 pid_t pid; 195 int omask; 196 sig_t intsave, quitsave; 197 198 if (shell == NULL) { 199 if ((shell = getenv("SHELL")) == NULL) 200 shell = _PATH_BSHELL; 201 if ((name = strrchr(shell, '/')) == NULL) 202 name = shell; 203 else 204 ++name; 205 } 206 if (!command) /* just checking... */ 207 return(1); 208 209 omask = sigblock(sigmask(SIGCHLD)); 210 switch(pid = vfork()) { 211 case -1: /* error */ 212 err(1, "fork"); 213 case 0: /* child */ 214 (void)sigsetmask(omask); 215 execl(shell, name, "-c", command, NULL); 216 err(1, "%s", shell); 217 } 218 intsave = signal(SIGINT, SIG_IGN); 219 quitsave = signal(SIGQUIT, SIG_IGN); 220 pid = waitpid(pid, (int *)&pstat, 0); 221 (void)sigsetmask(omask); 222 (void)signal(SIGINT, intsave); 223 (void)signal(SIGQUIT, quitsave); 224 return(pid == -1 ? -1 : pstat.w_status); 225} 226 227void 228usage() 229{ 230 231 (void)fprintf(stderr, 232 "usage: apply [-a magic] [-0123456789] command arguments ...\n"); 233 exit(1); 234} 235