apply.c revision 87231
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 3787231Smarkm#include <sys/cdefs.h> 3887231Smarkm 3987231Smarkm__FBSDID("$FreeBSD: head/usr.bin/apply/apply.c 87231 2001-12-02 20:40:22Z markm $"); 4087231Smarkm 411590Srgrimes#ifndef lint 4241568Sarchiestatic const char sccsid[] = "@(#)apply.c 8.4 (Berkeley) 4/4/94"; 4354113Skris#endif 441590Srgrimes 4567189Sbrian#include <sys/types.h> 461590Srgrimes#include <sys/wait.h> 471590Srgrimes 481590Srgrimes#include <ctype.h> 491590Srgrimes#include <err.h> 501590Srgrimes#include <paths.h> 511590Srgrimes#include <signal.h> 521590Srgrimes#include <stdio.h> 531590Srgrimes#include <stdlib.h> 541590Srgrimes#include <string.h> 551590Srgrimes#include <unistd.h> 561590Srgrimes 5771326Swill#define EXEC "exec " 581590Srgrimes 5971326Swillstatic int exec_shell(const char *, char *, char *); 6071326Swillstatic void usage(void); 6170692Swill 621590Srgrimesint 6371326Swillmain(int argc, char *argv[]) { 6471326Swill int ch, debug, i, magic, n, nargs, offset, rval; 6571326Swill size_t clen, cmdsize, l; 6671326Swill char *c, *cmd, *name, *p, *q, *shell, *slashp, *tmpshell; 671590Srgrimes 681590Srgrimes debug = 0; 691590Srgrimes magic = '%'; /* Default magic char is `%'. */ 701590Srgrimes nargs = -1; 7170672Swill while ((ch = getopt(argc, argv, "a:d0123456789")) != -1) 721590Srgrimes switch (ch) { 731590Srgrimes case 'a': 741590Srgrimes if (optarg[1] != '\0') 751590Srgrimes errx(1, 7654157Scharnier "illegal magic character specification"); 771590Srgrimes magic = optarg[0]; 781590Srgrimes break; 791590Srgrimes case 'd': 801590Srgrimes debug = 1; 811590Srgrimes break; 821590Srgrimes case '0': case '1': case '2': case '3': case '4': 831590Srgrimes case '5': case '6': case '7': case '8': case '9': 841590Srgrimes if (nargs != -1) 851590Srgrimes errx(1, 8654157Scharnier "only one -# argument may be specified"); 871590Srgrimes nargs = optopt - '0'; 881590Srgrimes break; 891590Srgrimes default: 901590Srgrimes usage(); 911590Srgrimes } 921590Srgrimes argc -= optind; 931590Srgrimes argv += optind; 941590Srgrimes 951590Srgrimes if (argc < 2) 961590Srgrimes usage(); 971590Srgrimes 981590Srgrimes /* 991590Srgrimes * The command to run is argv[0], and the args are argv[1..]. 1001590Srgrimes * Look for %digit references in the command, remembering the 1011590Srgrimes * largest one. 1021590Srgrimes */ 1031590Srgrimes for (n = 0, p = argv[0]; *p != '\0'; ++p) 1041590Srgrimes if (p[0] == magic && isdigit(p[1]) && p[1] != '0') { 1051590Srgrimes ++p; 1061590Srgrimes if (p[0] - '0' > n) 1071590Srgrimes n = p[0] - '0'; 1081590Srgrimes } 1091590Srgrimes 1101590Srgrimes /* 11170692Swill * Figure out the shell and name arguments to pass to execl() 11270692Swill * in exec_shell(). Always malloc() shell and just set name 11370692Swill * to point at the last part of shell if there are any backslashes, 11470692Swill * otherwise just set it to point at the space malloc()'d. If 11570692Swill * SHELL environment variable exists, replace contents of 11670692Swill * shell with it. 11770692Swill */ 11870692Swill shell = name = NULL; 11970692Swill tmpshell = getenv("SHELL"); 12070692Swill shell = (tmpshell != NULL) ? strdup(tmpshell) : strdup(_PATH_BSHELL); 12170692Swill if (shell == NULL) 12270692Swill err(1, "strdup() failed"); 12370692Swill slashp = strrchr(shell, '/'); 12470692Swill name = (slashp != NULL) ? slashp + 1 : shell; 12570692Swill 12670692Swill /* 1271590Srgrimes * If there were any %digit references, then use those, otherwise 1281590Srgrimes * build a new command string with sufficient %digit references at 1291590Srgrimes * the end to consume (nargs) arguments each time round the loop. 13070692Swill * Allocate enough space to hold the maximum command. Save the 13170692Swill * size to pass to snprintf(). 1321590Srgrimes */ 13371326Swill cmdsize = sizeof(EXEC) - 1 + strlen(argv[0]) 13471326Swill + 9 * (sizeof(" %1") - 1) + 1; 13570692Swill if ((cmd = malloc(cmdsize)) == NULL) 1361590Srgrimes err(1, NULL); 1378874Srgrimes 1381590Srgrimes if (n == 0) { 1391590Srgrimes /* If nargs not set, default to a single argument. */ 1401590Srgrimes if (nargs == -1) 1411590Srgrimes nargs = 1; 1421590Srgrimes 1431590Srgrimes p = cmd; 14470692Swill offset = snprintf(cmd, cmdsize, EXEC "%s", argv[0]); 14582057Sbrian if ((size_t)offset >= cmdsize) 14670692Swill err(1, "snprintf() failed"); 14770692Swill p += offset; 14871615Swill cmdsize -= offset; 14970692Swill for (i = 1; i <= nargs; i++) { 15070692Swill offset = snprintf(p, cmdsize, " %c%d", magic, i); 15182057Sbrian if ((size_t)offset >= cmdsize) 15270692Swill err(1, "snprintf() failed"); 15370692Swill p += offset; 15471615Swill cmdsize -= offset; 15570692Swill } 1561590Srgrimes 1571590Srgrimes /* 1581590Srgrimes * If nargs set to the special value 0, eat a single 1591590Srgrimes * argument for each command execution. 1601590Srgrimes */ 1611590Srgrimes if (nargs == 0) 1621590Srgrimes nargs = 1; 1631590Srgrimes } else { 16470692Swill offset = snprintf(cmd, cmdsize, EXEC "%s", argv[0]); 16582057Sbrian if ((size_t)offset >= cmdsize) 16670692Swill err(1, "snprintf() failed"); 1671590Srgrimes nargs = n; 1681590Srgrimes } 1691590Srgrimes 1701590Srgrimes /* 1711590Srgrimes * Grab some space in which to build the command. Allocate 1721590Srgrimes * as necessary later, but no reason to build it up slowly 1731590Srgrimes * for the normal case. 1741590Srgrimes */ 1751590Srgrimes if ((c = malloc(clen = 1024)) == NULL) 1761590Srgrimes err(1, NULL); 1771590Srgrimes 1781590Srgrimes /* 1791590Srgrimes * (argc) and (argv) are still offset by one to make it simpler to 1801590Srgrimes * expand %digit references. At the end of the loop check for (argc) 1811590Srgrimes * equals 1 means that all the (argv) has been consumed. 1821590Srgrimes */ 1831590Srgrimes for (rval = 0; argc > nargs; argc -= nargs, argv += nargs) { 1841590Srgrimes /* 1851590Srgrimes * Find a max value for the command length, and ensure 1861590Srgrimes * there's enough space to build it. 1871590Srgrimes */ 1881590Srgrimes for (l = strlen(cmd), i = 0; i < nargs; i++) 18954113Skris l += strlen(argv[i+1]); 1901590Srgrimes if (l > clen && (c = realloc(c, clen = l)) == NULL) 1911590Srgrimes err(1, NULL); 1921590Srgrimes 1931590Srgrimes /* Expand command argv references. */ 1941590Srgrimes for (p = cmd, q = c; *p != '\0'; ++p) 19570692Swill if (p[0] == magic && isdigit(p[1]) && p[1] != '0') { 19670692Swill offset = snprintf(q, l, "%s", 19770692Swill argv[(++p)[0] - '0']); 19882057Sbrian if ((size_t)offset >= l) 19970692Swill err(1, "snprintf() failed"); 20070692Swill q += offset; 20171615Swill l -= offset; 20270692Swill } else 2031590Srgrimes *q++ = *p; 2041590Srgrimes 2051590Srgrimes /* Terminate the command string. */ 2061590Srgrimes *q = '\0'; 2071590Srgrimes 2081590Srgrimes /* Run the command. */ 2091590Srgrimes if (debug) 2101590Srgrimes (void)printf("%s\n", c); 2111590Srgrimes else 21271326Swill if (exec_shell(c, shell, name)) 2131590Srgrimes rval = 1; 2141590Srgrimes } 2151590Srgrimes 2161590Srgrimes if (argc != 1) 2171590Srgrimes errx(1, "expecting additional argument%s after \"%s\"", 21870692Swill (nargs - argc) ? "s" : "", argv[argc - 1]); 21970692Swill free(cmd); 22070692Swill free(c); 22170692Swill free(shell); 2221590Srgrimes exit(rval); 2231590Srgrimes} 2241590Srgrimes 2251590Srgrimes/* 22670692Swill * exec_shell -- 22770692Swill * Execute a shell command using passed use_shell and use_name 22870692Swill * arguments. 2291590Srgrimes */ 23070692Swillstatic int 23171326Swillexec_shell(const char *command, char *use_shell, char *use_name) 2321590Srgrimes{ 2331590Srgrimes pid_t pid; 23443928Seivind int omask, pstat; 2351590Srgrimes sig_t intsave, quitsave; 2361590Srgrimes 23770672Swill if (!command) /* just checking... */ 2381590Srgrimes return(1); 2391590Srgrimes 2401590Srgrimes omask = sigblock(sigmask(SIGCHLD)); 24160706Skris switch(pid = vfork()) { 2421590Srgrimes case -1: /* error */ 24360706Skris err(1, "vfork"); 2441590Srgrimes case 0: /* child */ 2451590Srgrimes (void)sigsetmask(omask); 24679452Sbrian execl(use_shell, use_name, "-c", command, (char *)NULL); 24770692Swill warn("%s", use_shell); 24860706Skris _exit(1); 2491590Srgrimes } 2501590Srgrimes intsave = signal(SIGINT, SIG_IGN); 2511590Srgrimes quitsave = signal(SIGQUIT, SIG_IGN); 25243928Seivind pid = waitpid(pid, &pstat, 0); 2531590Srgrimes (void)sigsetmask(omask); 2541590Srgrimes (void)signal(SIGINT, intsave); 2551590Srgrimes (void)signal(SIGQUIT, quitsave); 25643928Seivind return(pid == -1 ? -1 : pstat); 2571590Srgrimes} 2581590Srgrimes 2591590Srgrimesvoid 2601590Srgrimesusage() 2611590Srgrimes{ 2621590Srgrimes 2631590Srgrimes (void)fprintf(stderr, 26470672Swill "usage: apply [-a magic] [-d] [-0123456789] command arguments ...\n"); 2651590Srgrimes exit(1); 2661590Srgrimes} 267