apply.c revision 204761
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 3787628Sdwmalone#if 0 3887628Sdwmalone#ifndef lint 3987628Sdwmalonestatic char sccsid[] = "@(#)apply.c 8.4 (Berkeley) 4/4/94"; 4087628Sdwmalone#endif 4187628Sdwmalone#endif 4287628Sdwmalone 4387231Smarkm#include <sys/cdefs.h> 4487231Smarkm__FBSDID("$FreeBSD: head/usr.bin/apply/apply.c 204761 2010-03-05 15:23:01Z jh $"); 4587231Smarkm 4667189Sbrian#include <sys/types.h> 47204761Sjh#include <sys/sbuf.h> 481590Srgrimes#include <sys/wait.h> 491590Srgrimes 501590Srgrimes#include <ctype.h> 511590Srgrimes#include <err.h> 52204761Sjh#include <errno.h> 531590Srgrimes#include <paths.h> 541590Srgrimes#include <signal.h> 551590Srgrimes#include <stdio.h> 561590Srgrimes#include <stdlib.h> 571590Srgrimes#include <string.h> 581590Srgrimes#include <unistd.h> 591590Srgrimes 6071326Swill#define EXEC "exec " 611590Srgrimes 6271326Swillstatic int exec_shell(const char *, char *, char *); 6371326Swillstatic void usage(void); 6470692Swill 651590Srgrimesint 66204761Sjhmain(int argc, char *argv[]) 67204761Sjh{ 68204761Sjh struct sbuf *cmdbuf; 69204761Sjh long arg_max; 7071326Swill int ch, debug, i, magic, n, nargs, offset, rval; 71204761Sjh size_t cmdsize; 72204761Sjh char *cmd, *name, *p, *shell, *slashp, *tmpshell; 731590Srgrimes 741590Srgrimes debug = 0; 751590Srgrimes magic = '%'; /* Default magic char is `%'. */ 761590Srgrimes nargs = -1; 7770672Swill while ((ch = getopt(argc, argv, "a:d0123456789")) != -1) 781590Srgrimes switch (ch) { 791590Srgrimes case 'a': 801590Srgrimes if (optarg[1] != '\0') 811590Srgrimes errx(1, 8254157Scharnier "illegal magic character specification"); 831590Srgrimes magic = optarg[0]; 841590Srgrimes break; 851590Srgrimes case 'd': 861590Srgrimes debug = 1; 871590Srgrimes break; 881590Srgrimes case '0': case '1': case '2': case '3': case '4': 891590Srgrimes case '5': case '6': case '7': case '8': case '9': 901590Srgrimes if (nargs != -1) 911590Srgrimes errx(1, 9254157Scharnier "only one -# argument may be specified"); 931590Srgrimes nargs = optopt - '0'; 941590Srgrimes break; 951590Srgrimes default: 961590Srgrimes usage(); 971590Srgrimes } 981590Srgrimes argc -= optind; 991590Srgrimes argv += optind; 1001590Srgrimes 1011590Srgrimes if (argc < 2) 1021590Srgrimes usage(); 1031590Srgrimes 1041590Srgrimes /* 1051590Srgrimes * The command to run is argv[0], and the args are argv[1..]. 1061590Srgrimes * Look for %digit references in the command, remembering the 1071590Srgrimes * largest one. 1081590Srgrimes */ 1091590Srgrimes for (n = 0, p = argv[0]; *p != '\0'; ++p) 1101590Srgrimes if (p[0] == magic && isdigit(p[1]) && p[1] != '0') { 1111590Srgrimes ++p; 1121590Srgrimes if (p[0] - '0' > n) 1131590Srgrimes n = p[0] - '0'; 1141590Srgrimes } 1151590Srgrimes 1161590Srgrimes /* 11770692Swill * Figure out the shell and name arguments to pass to execl() 11870692Swill * in exec_shell(). Always malloc() shell and just set name 11970692Swill * to point at the last part of shell if there are any backslashes, 12070692Swill * otherwise just set it to point at the space malloc()'d. If 12170692Swill * SHELL environment variable exists, replace contents of 12270692Swill * shell with it. 12370692Swill */ 12470692Swill shell = name = NULL; 12570692Swill tmpshell = getenv("SHELL"); 12670692Swill shell = (tmpshell != NULL) ? strdup(tmpshell) : strdup(_PATH_BSHELL); 12770692Swill if (shell == NULL) 12870692Swill err(1, "strdup() failed"); 12970692Swill slashp = strrchr(shell, '/'); 13070692Swill name = (slashp != NULL) ? slashp + 1 : shell; 13170692Swill 13270692Swill /* 1331590Srgrimes * If there were any %digit references, then use those, otherwise 1341590Srgrimes * build a new command string with sufficient %digit references at 1351590Srgrimes * the end to consume (nargs) arguments each time round the loop. 13670692Swill * Allocate enough space to hold the maximum command. Save the 13770692Swill * size to pass to snprintf(). 1381590Srgrimes */ 13971326Swill cmdsize = sizeof(EXEC) - 1 + strlen(argv[0]) 14071326Swill + 9 * (sizeof(" %1") - 1) + 1; 14170692Swill if ((cmd = malloc(cmdsize)) == NULL) 1421590Srgrimes err(1, NULL); 1438874Srgrimes 1441590Srgrimes if (n == 0) { 1451590Srgrimes /* If nargs not set, default to a single argument. */ 1461590Srgrimes if (nargs == -1) 1471590Srgrimes nargs = 1; 1481590Srgrimes 1491590Srgrimes p = cmd; 15070692Swill offset = snprintf(cmd, cmdsize, EXEC "%s", argv[0]); 15182057Sbrian if ((size_t)offset >= cmdsize) 152204761Sjh errx(1, "snprintf() failed"); 15370692Swill p += offset; 15471615Swill cmdsize -= offset; 15570692Swill for (i = 1; i <= nargs; i++) { 15670692Swill offset = snprintf(p, cmdsize, " %c%d", magic, i); 15782057Sbrian if ((size_t)offset >= cmdsize) 158204761Sjh errx(1, "snprintf() failed"); 15970692Swill p += offset; 16071615Swill cmdsize -= offset; 16170692Swill } 1621590Srgrimes 1631590Srgrimes /* 1641590Srgrimes * If nargs set to the special value 0, eat a single 1651590Srgrimes * argument for each command execution. 1661590Srgrimes */ 1671590Srgrimes if (nargs == 0) 1681590Srgrimes nargs = 1; 1691590Srgrimes } else { 17070692Swill offset = snprintf(cmd, cmdsize, EXEC "%s", argv[0]); 17182057Sbrian if ((size_t)offset >= cmdsize) 172204761Sjh errx(1, "snprintf() failed"); 1731590Srgrimes nargs = n; 1741590Srgrimes } 1751590Srgrimes 176204761Sjh cmdbuf = sbuf_new(NULL, NULL, 1024, SBUF_AUTOEXTEND); 177204761Sjh if (cmdbuf == NULL) 1781590Srgrimes err(1, NULL); 1791590Srgrimes 180204761Sjh arg_max = sysconf(_SC_ARG_MAX); 181204761Sjh 1821590Srgrimes /* 1831590Srgrimes * (argc) and (argv) are still offset by one to make it simpler to 1841590Srgrimes * expand %digit references. At the end of the loop check for (argc) 1851590Srgrimes * equals 1 means that all the (argv) has been consumed. 1861590Srgrimes */ 1871590Srgrimes for (rval = 0; argc > nargs; argc -= nargs, argv += nargs) { 188204761Sjh sbuf_clear(cmdbuf); 1891590Srgrimes /* Expand command argv references. */ 190204761Sjh for (p = cmd; *p != '\0'; ++p) { 19170692Swill if (p[0] == magic && isdigit(p[1]) && p[1] != '0') { 192204761Sjh if (sbuf_cat(cmdbuf, argv[(++p)[0] - '0']) 193204761Sjh == -1) 194204761Sjh errc(1, ENOMEM, "sbuf"); 195204761Sjh } else { 196204761Sjh if (sbuf_putc(cmdbuf, *p) == -1) 197204761Sjh errc(1, ENOMEM, "sbuf"); 198204761Sjh } 199204761Sjh if (sbuf_len(cmdbuf) > arg_max) 200204761Sjh errc(1, E2BIG, NULL); 201204761Sjh } 2021590Srgrimes 2031590Srgrimes /* Terminate the command string. */ 204204761Sjh sbuf_finish(cmdbuf); 2051590Srgrimes 2061590Srgrimes /* Run the command. */ 2071590Srgrimes if (debug) 208204761Sjh (void)printf("%s\n", sbuf_data(cmdbuf)); 2091590Srgrimes else 210204761Sjh if (exec_shell(sbuf_data(cmdbuf), shell, name)) 2111590Srgrimes rval = 1; 2121590Srgrimes } 2131590Srgrimes 2141590Srgrimes if (argc != 1) 2151590Srgrimes errx(1, "expecting additional argument%s after \"%s\"", 216204761Sjh (nargs - argc) ? "s" : "", argv[argc - 1]); 21770692Swill free(cmd); 218204761Sjh sbuf_delete(cmdbuf); 21970692Swill free(shell); 2201590Srgrimes exit(rval); 2211590Srgrimes} 2221590Srgrimes 2231590Srgrimes/* 22470692Swill * exec_shell -- 22570692Swill * Execute a shell command using passed use_shell and use_name 22670692Swill * arguments. 2271590Srgrimes */ 22870692Swillstatic int 22971326Swillexec_shell(const char *command, char *use_shell, char *use_name) 2301590Srgrimes{ 2311590Srgrimes pid_t pid; 23243928Seivind int omask, pstat; 2331590Srgrimes sig_t intsave, quitsave; 2341590Srgrimes 23570672Swill if (!command) /* just checking... */ 2361590Srgrimes return(1); 2371590Srgrimes 2381590Srgrimes omask = sigblock(sigmask(SIGCHLD)); 23960706Skris switch(pid = vfork()) { 2401590Srgrimes case -1: /* error */ 24160706Skris err(1, "vfork"); 2421590Srgrimes case 0: /* child */ 2431590Srgrimes (void)sigsetmask(omask); 24479452Sbrian execl(use_shell, use_name, "-c", command, (char *)NULL); 24570692Swill warn("%s", use_shell); 24660706Skris _exit(1); 2471590Srgrimes } 2481590Srgrimes intsave = signal(SIGINT, SIG_IGN); 2491590Srgrimes quitsave = signal(SIGQUIT, SIG_IGN); 25043928Seivind pid = waitpid(pid, &pstat, 0); 2511590Srgrimes (void)sigsetmask(omask); 2521590Srgrimes (void)signal(SIGINT, intsave); 2531590Srgrimes (void)signal(SIGQUIT, quitsave); 25443928Seivind return(pid == -1 ? -1 : pstat); 2551590Srgrimes} 2561590Srgrimes 2571590Srgrimesvoid 25899984Salfredusage(void) 2591590Srgrimes{ 2601590Srgrimes 2611590Srgrimes (void)fprintf(stderr, 26270672Swill "usage: apply [-a magic] [-d] [-0123456789] command arguments ...\n"); 2631590Srgrimes exit(1); 2641590Srgrimes} 265