apply.c revision 43928
11590Srgrimes/*- 21590Srgrimes * Copyright (c) 1994 31590Srgrimes * The Regents of the University of California. All rights reserved. 41590Srgrimes * 51590Srgrimes * This code is derived from software contributed to Berkeley by 61590Srgrimes * Jan-Simon Pendry. 71590Srgrimes * 81590Srgrimes * Redistribution and use in source and binary forms, with or without 91590Srgrimes * modification, are permitted provided that the following conditions 101590Srgrimes * are met: 111590Srgrimes * 1. Redistributions of source code must retain the above copyright 121590Srgrimes * notice, this list of conditions and the following disclaimer. 131590Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 141590Srgrimes * notice, this list of conditions and the following disclaimer in the 151590Srgrimes * documentation and/or other materials provided with the distribution. 161590Srgrimes * 3. All advertising materials mentioning features or use of this software 171590Srgrimes * must display the following acknowledgement: 181590Srgrimes * This product includes software developed by the University of 191590Srgrimes * California, Berkeley and its contributors. 201590Srgrimes * 4. Neither the name of the University nor the names of its contributors 211590Srgrimes * may be used to endorse or promote products derived from this software 221590Srgrimes * without specific prior written permission. 231590Srgrimes * 241590Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 251590Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 261590Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 271590Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 281590Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 291590Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 301590Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 311590Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 321590Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 331590Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 341590Srgrimes * SUCH DAMAGE. 351590Srgrimes */ 361590Srgrimes 371590Srgrimes#ifndef lint 3841568Sarchiestatic const char sccsid[] = "@(#)apply.c 8.4 (Berkeley) 4/4/94"; 391590Srgrimes#endif /* not lint */ 401590Srgrimes 411590Srgrimes#include <sys/wait.h> 421590Srgrimes 431590Srgrimes#include <ctype.h> 441590Srgrimes#include <err.h> 451590Srgrimes#include <paths.h> 461590Srgrimes#include <signal.h> 471590Srgrimes#include <stdio.h> 481590Srgrimes#include <stdlib.h> 491590Srgrimes#include <string.h> 501590Srgrimes#include <unistd.h> 511590Srgrimes 521590Srgrimesvoid usage __P((void)); 531590Srgrimesint system __P((const char *)); 541590Srgrimes 551590Srgrimesint 561590Srgrimesmain(argc, argv) 571590Srgrimes int argc; 581590Srgrimes char *argv[]; 591590Srgrimes{ 601590Srgrimes int ch, clen, debug, i, l, magic, n, nargs, rval; 611590Srgrimes char *c, *cmd, *p, *q; 621590Srgrimes 631590Srgrimes debug = 0; 641590Srgrimes magic = '%'; /* Default magic char is `%'. */ 651590Srgrimes nargs = -1; 6624360Simp while ((ch = getopt(argc, argv, "a:d0123456789")) != -1) 671590Srgrimes switch (ch) { 681590Srgrimes case 'a': 691590Srgrimes if (optarg[1] != '\0') 701590Srgrimes errx(1, 711590Srgrimes "illegal magic character specification."); 721590Srgrimes magic = optarg[0]; 731590Srgrimes break; 741590Srgrimes case 'd': 751590Srgrimes debug = 1; 761590Srgrimes break; 771590Srgrimes case '0': case '1': case '2': case '3': case '4': 781590Srgrimes case '5': case '6': case '7': case '8': case '9': 791590Srgrimes if (nargs != -1) 801590Srgrimes errx(1, 811590Srgrimes "only one -# argument may be specified."); 821590Srgrimes nargs = optopt - '0'; 831590Srgrimes break; 841590Srgrimes default: 851590Srgrimes usage(); 861590Srgrimes } 871590Srgrimes argc -= optind; 881590Srgrimes argv += optind; 891590Srgrimes 901590Srgrimes if (argc < 2) 911590Srgrimes usage(); 921590Srgrimes 931590Srgrimes /* 941590Srgrimes * The command to run is argv[0], and the args are argv[1..]. 951590Srgrimes * Look for %digit references in the command, remembering the 961590Srgrimes * largest one. 971590Srgrimes */ 981590Srgrimes for (n = 0, p = argv[0]; *p != '\0'; ++p) 991590Srgrimes if (p[0] == magic && isdigit(p[1]) && p[1] != '0') { 1001590Srgrimes ++p; 1011590Srgrimes if (p[0] - '0' > n) 1021590Srgrimes n = p[0] - '0'; 1031590Srgrimes } 1041590Srgrimes 1051590Srgrimes /* 1061590Srgrimes * If there were any %digit references, then use those, otherwise 1071590Srgrimes * build a new command string with sufficient %digit references at 1081590Srgrimes * the end to consume (nargs) arguments each time round the loop. 1091590Srgrimes * Allocate enough space to hold the maximum command. 1101590Srgrimes */ 1111590Srgrimes if ((cmd = malloc(sizeof("exec ") - 1 + 1121590Srgrimes strlen(argv[0]) + 9 * (sizeof(" %1") - 1) + 1)) == NULL) 1131590Srgrimes err(1, NULL); 1148874Srgrimes 1151590Srgrimes if (n == 0) { 1161590Srgrimes /* If nargs not set, default to a single argument. */ 1171590Srgrimes if (nargs == -1) 1181590Srgrimes nargs = 1; 1191590Srgrimes 1201590Srgrimes p = cmd; 1211590Srgrimes p += sprintf(cmd, "exec %s", argv[0]); 1221590Srgrimes for (i = 1; i <= nargs; i++) 1231590Srgrimes p += sprintf(p, " %c%d", magic, i); 1241590Srgrimes 1251590Srgrimes /* 1261590Srgrimes * If nargs set to the special value 0, eat a single 1271590Srgrimes * argument for each command execution. 1281590Srgrimes */ 1291590Srgrimes if (nargs == 0) 1301590Srgrimes nargs = 1; 1311590Srgrimes } else { 1321590Srgrimes (void)sprintf(cmd, "exec %s", argv[0]); 1331590Srgrimes nargs = n; 1341590Srgrimes } 1351590Srgrimes 1361590Srgrimes /* 1371590Srgrimes * Grab some space in which to build the command. Allocate 1381590Srgrimes * as necessary later, but no reason to build it up slowly 1391590Srgrimes * for the normal case. 1401590Srgrimes */ 1411590Srgrimes if ((c = malloc(clen = 1024)) == NULL) 1421590Srgrimes err(1, NULL); 1431590Srgrimes 1441590Srgrimes /* 1451590Srgrimes * (argc) and (argv) are still offset by one to make it simpler to 1461590Srgrimes * expand %digit references. At the end of the loop check for (argc) 1471590Srgrimes * equals 1 means that all the (argv) has been consumed. 1481590Srgrimes */ 1491590Srgrimes for (rval = 0; argc > nargs; argc -= nargs, argv += nargs) { 1501590Srgrimes /* 1511590Srgrimes * Find a max value for the command length, and ensure 1521590Srgrimes * there's enough space to build it. 1531590Srgrimes */ 1541590Srgrimes for (l = strlen(cmd), i = 0; i < nargs; i++) 1551590Srgrimes l += strlen(argv[i]); 1561590Srgrimes if (l > clen && (c = realloc(c, clen = l)) == NULL) 1571590Srgrimes err(1, NULL); 1581590Srgrimes 1591590Srgrimes /* Expand command argv references. */ 1601590Srgrimes for (p = cmd, q = c; *p != '\0'; ++p) 1611590Srgrimes if (p[0] == magic && isdigit(p[1]) && p[1] != '0') 1621590Srgrimes q += sprintf(q, "%s", argv[(++p)[0] - '0']); 1631590Srgrimes else 1641590Srgrimes *q++ = *p; 1651590Srgrimes 1661590Srgrimes /* Terminate the command string. */ 1671590Srgrimes *q = '\0'; 1681590Srgrimes 1691590Srgrimes /* Run the command. */ 1701590Srgrimes if (debug) 1711590Srgrimes (void)printf("%s\n", c); 1721590Srgrimes else 1731590Srgrimes if (system(c)) 1741590Srgrimes rval = 1; 1751590Srgrimes } 1761590Srgrimes 1771590Srgrimes if (argc != 1) 1781590Srgrimes errx(1, "expecting additional argument%s after \"%s\"", 1791590Srgrimes (nargs - argc) ? "s" : "", argv[argc - 1]); 1801590Srgrimes exit(rval); 1811590Srgrimes} 1821590Srgrimes 1831590Srgrimes/* 1841590Srgrimes * system -- 1851590Srgrimes * Private version of system(3). Use the user's SHELL environment 1861590Srgrimes * variable as the shell to execute. 1871590Srgrimes */ 1881590Srgrimesint 1891590Srgrimessystem(command) 1901590Srgrimes const char *command; 1911590Srgrimes{ 1921590Srgrimes static char *name, *shell; 1931590Srgrimes pid_t pid; 19443928Seivind int omask, pstat; 1951590Srgrimes sig_t intsave, quitsave; 1961590Srgrimes 1971590Srgrimes if (shell == NULL) { 1981590Srgrimes if ((shell = getenv("SHELL")) == NULL) 1991590Srgrimes shell = _PATH_BSHELL; 2001590Srgrimes if ((name = strrchr(shell, '/')) == NULL) 2011590Srgrimes name = shell; 2021590Srgrimes else 2031590Srgrimes ++name; 2041590Srgrimes } 2051590Srgrimes if (!command) /* just checking... */ 2061590Srgrimes return(1); 2071590Srgrimes 2081590Srgrimes omask = sigblock(sigmask(SIGCHLD)); 20940301Sdes switch(pid = fork()) { 2101590Srgrimes case -1: /* error */ 2111590Srgrimes err(1, "fork"); 2121590Srgrimes case 0: /* child */ 2131590Srgrimes (void)sigsetmask(omask); 2141590Srgrimes execl(shell, name, "-c", command, NULL); 2151590Srgrimes err(1, "%s", shell); 2161590Srgrimes } 2171590Srgrimes intsave = signal(SIGINT, SIG_IGN); 2181590Srgrimes quitsave = signal(SIGQUIT, SIG_IGN); 21943928Seivind pid = waitpid(pid, &pstat, 0); 2201590Srgrimes (void)sigsetmask(omask); 2211590Srgrimes (void)signal(SIGINT, intsave); 2221590Srgrimes (void)signal(SIGQUIT, quitsave); 22343928Seivind return(pid == -1 ? -1 : pstat); 2241590Srgrimes} 2251590Srgrimes 2261590Srgrimesvoid 2271590Srgrimesusage() 2281590Srgrimes{ 2291590Srgrimes 2301590Srgrimes (void)fprintf(stderr, 2311590Srgrimes "usage: apply [-a magic] [-0123456789] command arguments ...\n"); 2321590Srgrimes exit(1); 2331590Srgrimes} 234