apply.c revision 245048
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 * 4. Neither the name of the University nor the names of its contributors 171590Srgrimes * may be used to endorse or promote products derived from this software 181590Srgrimes * without specific prior written permission. 191590Srgrimes * 201590Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 211590Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 221590Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 231590Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 241590Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 251590Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 261590Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 271590Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 281590Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 291590Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 301590Srgrimes * SUCH DAMAGE. 311590Srgrimes */ 321590Srgrimes 3387628Sdwmalone#if 0 3487628Sdwmalone#ifndef lint 3587628Sdwmalonestatic char sccsid[] = "@(#)apply.c 8.4 (Berkeley) 4/4/94"; 3687628Sdwmalone#endif 3787628Sdwmalone#endif 3887628Sdwmalone 3987231Smarkm#include <sys/cdefs.h> 4087231Smarkm__FBSDID("$FreeBSD: head/usr.bin/apply/apply.c 245048 2013-01-04 23:44:22Z delphij $"); 4187231Smarkm 4267189Sbrian#include <sys/types.h> 43204761Sjh#include <sys/sbuf.h> 441590Srgrimes#include <sys/wait.h> 451590Srgrimes 461590Srgrimes#include <ctype.h> 471590Srgrimes#include <err.h> 48204761Sjh#include <errno.h> 491590Srgrimes#include <paths.h> 501590Srgrimes#include <signal.h> 511590Srgrimes#include <stdio.h> 521590Srgrimes#include <stdlib.h> 531590Srgrimes#include <string.h> 541590Srgrimes#include <unistd.h> 551590Srgrimes 5671326Swill#define EXEC "exec " 571590Srgrimes 58245048Sdelphijstatic int exec_shell(const char *, const char *, const char *); 5971326Swillstatic void usage(void); 6070692Swill 611590Srgrimesint 62204761Sjhmain(int argc, char *argv[]) 63204761Sjh{ 64204761Sjh struct sbuf *cmdbuf; 65204761Sjh long arg_max; 6671326Swill int ch, debug, i, magic, n, nargs, offset, rval; 67204761Sjh size_t cmdsize; 68204761Sjh char *cmd, *name, *p, *shell, *slashp, *tmpshell; 691590Srgrimes 701590Srgrimes debug = 0; 711590Srgrimes magic = '%'; /* Default magic char is `%'. */ 721590Srgrimes nargs = -1; 7370672Swill while ((ch = getopt(argc, argv, "a:d0123456789")) != -1) 741590Srgrimes switch (ch) { 751590Srgrimes case 'a': 761590Srgrimes if (optarg[1] != '\0') 771590Srgrimes errx(1, 7854157Scharnier "illegal magic character specification"); 791590Srgrimes magic = optarg[0]; 801590Srgrimes break; 811590Srgrimes case 'd': 821590Srgrimes debug = 1; 831590Srgrimes break; 841590Srgrimes case '0': case '1': case '2': case '3': case '4': 851590Srgrimes case '5': case '6': case '7': case '8': case '9': 861590Srgrimes if (nargs != -1) 871590Srgrimes errx(1, 8854157Scharnier "only one -# argument may be specified"); 891590Srgrimes nargs = optopt - '0'; 901590Srgrimes break; 911590Srgrimes default: 921590Srgrimes usage(); 931590Srgrimes } 941590Srgrimes argc -= optind; 951590Srgrimes argv += optind; 961590Srgrimes 971590Srgrimes if (argc < 2) 981590Srgrimes usage(); 991590Srgrimes 1001590Srgrimes /* 1011590Srgrimes * The command to run is argv[0], and the args are argv[1..]. 1021590Srgrimes * Look for %digit references in the command, remembering the 1031590Srgrimes * largest one. 1041590Srgrimes */ 1051590Srgrimes for (n = 0, p = argv[0]; *p != '\0'; ++p) 1061590Srgrimes if (p[0] == magic && isdigit(p[1]) && p[1] != '0') { 1071590Srgrimes ++p; 1081590Srgrimes if (p[0] - '0' > n) 1091590Srgrimes n = p[0] - '0'; 1101590Srgrimes } 1111590Srgrimes 1121590Srgrimes /* 11370692Swill * Figure out the shell and name arguments to pass to execl() 11470692Swill * in exec_shell(). Always malloc() shell and just set name 11570692Swill * to point at the last part of shell if there are any backslashes, 11670692Swill * otherwise just set it to point at the space malloc()'d. If 11770692Swill * SHELL environment variable exists, replace contents of 11870692Swill * shell with it. 11970692Swill */ 12070692Swill shell = name = NULL; 12170692Swill tmpshell = getenv("SHELL"); 12270692Swill shell = (tmpshell != NULL) ? strdup(tmpshell) : strdup(_PATH_BSHELL); 12370692Swill if (shell == NULL) 12470692Swill err(1, "strdup() failed"); 12570692Swill slashp = strrchr(shell, '/'); 12670692Swill name = (slashp != NULL) ? slashp + 1 : shell; 12770692Swill 12870692Swill /* 1291590Srgrimes * If there were any %digit references, then use those, otherwise 1301590Srgrimes * build a new command string with sufficient %digit references at 1311590Srgrimes * the end to consume (nargs) arguments each time round the loop. 13270692Swill * Allocate enough space to hold the maximum command. Save the 13370692Swill * size to pass to snprintf(). 1341590Srgrimes */ 13571326Swill cmdsize = sizeof(EXEC) - 1 + strlen(argv[0]) 13671326Swill + 9 * (sizeof(" %1") - 1) + 1; 13770692Swill if ((cmd = malloc(cmdsize)) == NULL) 1381590Srgrimes err(1, NULL); 1398874Srgrimes 1401590Srgrimes if (n == 0) { 1411590Srgrimes /* If nargs not set, default to a single argument. */ 1421590Srgrimes if (nargs == -1) 1431590Srgrimes nargs = 1; 1441590Srgrimes 1451590Srgrimes p = cmd; 14670692Swill offset = snprintf(cmd, cmdsize, EXEC "%s", argv[0]); 14782057Sbrian if ((size_t)offset >= cmdsize) 148204761Sjh errx(1, "snprintf() failed"); 14970692Swill p += offset; 15071615Swill cmdsize -= offset; 15170692Swill for (i = 1; i <= nargs; i++) { 15270692Swill offset = snprintf(p, cmdsize, " %c%d", magic, i); 15382057Sbrian if ((size_t)offset >= cmdsize) 154204761Sjh errx(1, "snprintf() failed"); 15570692Swill p += offset; 15671615Swill cmdsize -= offset; 15770692Swill } 1581590Srgrimes 1591590Srgrimes /* 1601590Srgrimes * If nargs set to the special value 0, eat a single 1611590Srgrimes * argument for each command execution. 1621590Srgrimes */ 1631590Srgrimes if (nargs == 0) 1641590Srgrimes nargs = 1; 1651590Srgrimes } else { 16670692Swill offset = snprintf(cmd, cmdsize, EXEC "%s", argv[0]); 16782057Sbrian if ((size_t)offset >= cmdsize) 168204761Sjh errx(1, "snprintf() failed"); 1691590Srgrimes nargs = n; 1701590Srgrimes } 1711590Srgrimes 172204761Sjh cmdbuf = sbuf_new(NULL, NULL, 1024, SBUF_AUTOEXTEND); 173204761Sjh if (cmdbuf == NULL) 1741590Srgrimes err(1, NULL); 1751590Srgrimes 176204761Sjh arg_max = sysconf(_SC_ARG_MAX); 177204761Sjh 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) { 184204761Sjh sbuf_clear(cmdbuf); 1851590Srgrimes /* Expand command argv references. */ 186204761Sjh for (p = cmd; *p != '\0'; ++p) { 18770692Swill if (p[0] == magic && isdigit(p[1]) && p[1] != '0') { 188204761Sjh if (sbuf_cat(cmdbuf, argv[(++p)[0] - '0']) 189204761Sjh == -1) 190204761Sjh errc(1, ENOMEM, "sbuf"); 191204761Sjh } else { 192204761Sjh if (sbuf_putc(cmdbuf, *p) == -1) 193204761Sjh errc(1, ENOMEM, "sbuf"); 194204761Sjh } 195204761Sjh if (sbuf_len(cmdbuf) > arg_max) 196204761Sjh errc(1, E2BIG, NULL); 197204761Sjh } 1981590Srgrimes 1991590Srgrimes /* Terminate the command string. */ 200204761Sjh sbuf_finish(cmdbuf); 2011590Srgrimes 2021590Srgrimes /* Run the command. */ 2031590Srgrimes if (debug) 204204761Sjh (void)printf("%s\n", sbuf_data(cmdbuf)); 2051590Srgrimes else 206204761Sjh if (exec_shell(sbuf_data(cmdbuf), shell, name)) 2071590Srgrimes rval = 1; 2081590Srgrimes } 2091590Srgrimes 2101590Srgrimes if (argc != 1) 2111590Srgrimes errx(1, "expecting additional argument%s after \"%s\"", 212204761Sjh (nargs - argc) ? "s" : "", argv[argc - 1]); 21370692Swill free(cmd); 214204761Sjh sbuf_delete(cmdbuf); 21570692Swill free(shell); 2161590Srgrimes exit(rval); 2171590Srgrimes} 2181590Srgrimes 2191590Srgrimes/* 22070692Swill * exec_shell -- 22170692Swill * Execute a shell command using passed use_shell and use_name 22270692Swill * arguments. 2231590Srgrimes */ 22470692Swillstatic int 225245048Sdelphijexec_shell(const char *command, const char *use_shell, const char *use_name) 2261590Srgrimes{ 2271590Srgrimes pid_t pid; 22843928Seivind int omask, pstat; 2291590Srgrimes sig_t intsave, quitsave; 2301590Srgrimes 23170672Swill if (!command) /* just checking... */ 2321590Srgrimes return(1); 2331590Srgrimes 2341590Srgrimes omask = sigblock(sigmask(SIGCHLD)); 23560706Skris switch(pid = vfork()) { 2361590Srgrimes case -1: /* error */ 23760706Skris err(1, "vfork"); 2381590Srgrimes case 0: /* child */ 2391590Srgrimes (void)sigsetmask(omask); 24079452Sbrian execl(use_shell, use_name, "-c", command, (char *)NULL); 24170692Swill warn("%s", use_shell); 24260706Skris _exit(1); 2431590Srgrimes } 2441590Srgrimes intsave = signal(SIGINT, SIG_IGN); 2451590Srgrimes quitsave = signal(SIGQUIT, SIG_IGN); 24643928Seivind pid = waitpid(pid, &pstat, 0); 2471590Srgrimes (void)sigsetmask(omask); 2481590Srgrimes (void)signal(SIGINT, intsave); 2491590Srgrimes (void)signal(SIGQUIT, quitsave); 25043928Seivind return(pid == -1 ? -1 : pstat); 2511590Srgrimes} 2521590Srgrimes 253245048Sdelphijstatic void 25499984Salfredusage(void) 2551590Srgrimes{ 2561590Srgrimes 2571590Srgrimes (void)fprintf(stderr, 25870672Swill "usage: apply [-a magic] [-d] [-0123456789] command arguments ...\n"); 2591590Srgrimes exit(1); 2601590Srgrimes} 261