apply.c revision 79452
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 3854113Skris#if 0 3941568Sarchiestatic const char sccsid[] = "@(#)apply.c 8.4 (Berkeley) 4/4/94"; 4054113Skris#endif 4154113Skrisstatic const char rcsid[] = 4254113Skris "$FreeBSD: head/usr.bin/apply/apply.c 79452 2001-07-09 09:24:06Z brian $"; 431590Srgrimes#endif /* not lint */ 441590Srgrimes 4567189Sbrian#include <sys/types.h> 4667189Sbrian 471590Srgrimes#include <sys/wait.h> 481590Srgrimes 491590Srgrimes#include <ctype.h> 501590Srgrimes#include <err.h> 511590Srgrimes#include <paths.h> 521590Srgrimes#include <signal.h> 531590Srgrimes#include <stdio.h> 541590Srgrimes#include <stdlib.h> 551590Srgrimes#include <string.h> 561590Srgrimes#include <unistd.h> 571590Srgrimes 5871326Swill#define EXEC "exec " 591590Srgrimes 6071326Swillstatic int exec_shell(const char *, char *, char *); 6171326Swillstatic void usage(void); 6270692Swill 631590Srgrimesint 6471326Swillmain(int argc, char *argv[]) { 6571326Swill int ch, debug, i, magic, n, nargs, offset, rval; 6671326Swill size_t clen, cmdsize, l; 6771326Swill char *c, *cmd, *name, *p, *q, *shell, *slashp, *tmpshell; 681590Srgrimes 691590Srgrimes debug = 0; 701590Srgrimes magic = '%'; /* Default magic char is `%'. */ 711590Srgrimes nargs = -1; 7270672Swill while ((ch = getopt(argc, argv, "a:d0123456789")) != -1) 731590Srgrimes switch (ch) { 741590Srgrimes case 'a': 751590Srgrimes if (optarg[1] != '\0') 761590Srgrimes errx(1, 7754157Scharnier "illegal magic character specification"); 781590Srgrimes magic = optarg[0]; 791590Srgrimes break; 801590Srgrimes case 'd': 811590Srgrimes debug = 1; 821590Srgrimes break; 831590Srgrimes case '0': case '1': case '2': case '3': case '4': 841590Srgrimes case '5': case '6': case '7': case '8': case '9': 851590Srgrimes if (nargs != -1) 861590Srgrimes errx(1, 8754157Scharnier "only one -# argument may be specified"); 881590Srgrimes nargs = optopt - '0'; 891590Srgrimes break; 901590Srgrimes default: 911590Srgrimes usage(); 921590Srgrimes } 931590Srgrimes argc -= optind; 941590Srgrimes argv += optind; 951590Srgrimes 961590Srgrimes if (argc < 2) 971590Srgrimes usage(); 981590Srgrimes 991590Srgrimes /* 1001590Srgrimes * The command to run is argv[0], and the args are argv[1..]. 1011590Srgrimes * Look for %digit references in the command, remembering the 1021590Srgrimes * largest one. 1031590Srgrimes */ 1041590Srgrimes for (n = 0, p = argv[0]; *p != '\0'; ++p) 1051590Srgrimes if (p[0] == magic && isdigit(p[1]) && p[1] != '0') { 1061590Srgrimes ++p; 1071590Srgrimes if (p[0] - '0' > n) 1081590Srgrimes n = p[0] - '0'; 1091590Srgrimes } 1101590Srgrimes 1111590Srgrimes /* 11270692Swill * Figure out the shell and name arguments to pass to execl() 11370692Swill * in exec_shell(). Always malloc() shell and just set name 11470692Swill * to point at the last part of shell if there are any backslashes, 11570692Swill * otherwise just set it to point at the space malloc()'d. If 11670692Swill * SHELL environment variable exists, replace contents of 11770692Swill * shell with it. 11870692Swill */ 11970692Swill shell = name = NULL; 12070692Swill tmpshell = getenv("SHELL"); 12170692Swill shell = (tmpshell != NULL) ? strdup(tmpshell) : strdup(_PATH_BSHELL); 12270692Swill if (shell == NULL) 12370692Swill err(1, "strdup() failed"); 12470692Swill slashp = strrchr(shell, '/'); 12570692Swill name = (slashp != NULL) ? slashp + 1 : shell; 12670692Swill 12770692Swill /* 1281590Srgrimes * If there were any %digit references, then use those, otherwise 1291590Srgrimes * build a new command string with sufficient %digit references at 1301590Srgrimes * the end to consume (nargs) arguments each time round the loop. 13170692Swill * Allocate enough space to hold the maximum command. Save the 13270692Swill * size to pass to snprintf(). 1331590Srgrimes */ 13471326Swill cmdsize = sizeof(EXEC) - 1 + strlen(argv[0]) 13571326Swill + 9 * (sizeof(" %1") - 1) + 1; 13670692Swill if ((cmd = malloc(cmdsize)) == NULL) 1371590Srgrimes err(1, NULL); 1388874Srgrimes 1391590Srgrimes if (n == 0) { 1401590Srgrimes /* If nargs not set, default to a single argument. */ 1411590Srgrimes if (nargs == -1) 1421590Srgrimes nargs = 1; 1431590Srgrimes 1441590Srgrimes p = cmd; 14570692Swill offset = snprintf(cmd, cmdsize, EXEC "%s", argv[0]); 14670692Swill if ((size_t)offset >= cmdsize) 14770692Swill err(1, "snprintf() failed"); 14870692Swill p += offset; 14971615Swill cmdsize -= offset; 15070692Swill for (i = 1; i <= nargs; i++) { 15170692Swill offset = snprintf(p, cmdsize, " %c%d", magic, i); 15270692Swill if ((size_t)offset >= cmdsize) 15370692Swill err(1, "snprintf() failed"); 15470692Swill p += offset; 15571615Swill cmdsize -= offset; 15670692Swill } 1571590Srgrimes 1581590Srgrimes /* 1591590Srgrimes * If nargs set to the special value 0, eat a single 1601590Srgrimes * argument for each command execution. 1611590Srgrimes */ 1621590Srgrimes if (nargs == 0) 1631590Srgrimes nargs = 1; 1641590Srgrimes } else { 16570692Swill offset = snprintf(cmd, cmdsize, EXEC "%s", argv[0]); 16670692Swill if ((size_t)offset >= cmdsize) 16770692Swill err(1, "snprintf() failed"); 1681590Srgrimes nargs = n; 1691590Srgrimes } 1701590Srgrimes 1711590Srgrimes /* 1721590Srgrimes * Grab some space in which to build the command. Allocate 1731590Srgrimes * as necessary later, but no reason to build it up slowly 1741590Srgrimes * for the normal case. 1751590Srgrimes */ 1761590Srgrimes if ((c = malloc(clen = 1024)) == NULL) 1771590Srgrimes err(1, NULL); 1781590Srgrimes 1791590Srgrimes /* 1801590Srgrimes * (argc) and (argv) are still offset by one to make it simpler to 1811590Srgrimes * expand %digit references. At the end of the loop check for (argc) 1821590Srgrimes * equals 1 means that all the (argv) has been consumed. 1831590Srgrimes */ 1841590Srgrimes for (rval = 0; argc > nargs; argc -= nargs, argv += nargs) { 1851590Srgrimes /* 1861590Srgrimes * Find a max value for the command length, and ensure 1871590Srgrimes * there's enough space to build it. 1881590Srgrimes */ 1891590Srgrimes for (l = strlen(cmd), i = 0; i < nargs; i++) 19054113Skris l += strlen(argv[i+1]); 1911590Srgrimes if (l > clen && (c = realloc(c, clen = l)) == NULL) 1921590Srgrimes err(1, NULL); 1931590Srgrimes 1941590Srgrimes /* Expand command argv references. */ 1951590Srgrimes for (p = cmd, q = c; *p != '\0'; ++p) 19670692Swill if (p[0] == magic && isdigit(p[1]) && p[1] != '0') { 19770692Swill offset = snprintf(q, l, "%s", 19870692Swill argv[(++p)[0] - '0']); 19970692Swill if ((size_t)offset >= l) 20070692Swill err(1, "snprintf() failed"); 20170692Swill q += offset; 20271615Swill l -= offset; 20370692Swill } else 2041590Srgrimes *q++ = *p; 2051590Srgrimes 2061590Srgrimes /* Terminate the command string. */ 2071590Srgrimes *q = '\0'; 2081590Srgrimes 2091590Srgrimes /* Run the command. */ 2101590Srgrimes if (debug) 2111590Srgrimes (void)printf("%s\n", c); 2121590Srgrimes else 21371326Swill if (exec_shell(c, shell, name)) 2141590Srgrimes rval = 1; 2151590Srgrimes } 2161590Srgrimes 2171590Srgrimes if (argc != 1) 2181590Srgrimes errx(1, "expecting additional argument%s after \"%s\"", 21970692Swill (nargs - argc) ? "s" : "", argv[argc - 1]); 22070692Swill free(cmd); 22170692Swill free(c); 22270692Swill free(shell); 2231590Srgrimes exit(rval); 2241590Srgrimes} 2251590Srgrimes 2261590Srgrimes/* 22770692Swill * exec_shell -- 22870692Swill * Execute a shell command using passed use_shell and use_name 22970692Swill * arguments. 2301590Srgrimes */ 23170692Swillstatic int 23271326Swillexec_shell(const char *command, char *use_shell, char *use_name) 2331590Srgrimes{ 2341590Srgrimes pid_t pid; 23543928Seivind int omask, pstat; 2361590Srgrimes sig_t intsave, quitsave; 2371590Srgrimes 23870672Swill if (!command) /* just checking... */ 2391590Srgrimes return(1); 2401590Srgrimes 2411590Srgrimes omask = sigblock(sigmask(SIGCHLD)); 24260706Skris switch(pid = vfork()) { 2431590Srgrimes case -1: /* error */ 24460706Skris err(1, "vfork"); 2451590Srgrimes case 0: /* child */ 2461590Srgrimes (void)sigsetmask(omask); 24779452Sbrian execl(use_shell, use_name, "-c", command, (char *)NULL); 24870692Swill warn("%s", use_shell); 24960706Skris _exit(1); 2501590Srgrimes } 2511590Srgrimes intsave = signal(SIGINT, SIG_IGN); 2521590Srgrimes quitsave = signal(SIGQUIT, SIG_IGN); 25343928Seivind pid = waitpid(pid, &pstat, 0); 2541590Srgrimes (void)sigsetmask(omask); 2551590Srgrimes (void)signal(SIGINT, intsave); 2561590Srgrimes (void)signal(SIGQUIT, quitsave); 25743928Seivind return(pid == -1 ? -1 : pstat); 2581590Srgrimes} 2591590Srgrimes 2601590Srgrimesvoid 2611590Srgrimesusage() 2621590Srgrimes{ 2631590Srgrimes 2641590Srgrimes (void)fprintf(stderr, 26570672Swill "usage: apply [-a magic] [-d] [-0123456789] command arguments ...\n"); 2661590Srgrimes exit(1); 2671590Srgrimes} 268