apply.c revision 337825
1/*- 2 * Copyright (c) 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Jan-Simon Pendry. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 4. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33#if 0 34#ifndef lint 35static char sccsid[] = "@(#)apply.c 8.4 (Berkeley) 4/4/94"; 36#endif 37#endif 38 39#include <sys/cdefs.h> 40__FBSDID("$FreeBSD: stable/11/usr.bin/apply/apply.c 337825 2018-08-15 01:24:43Z kevans $"); 41 42#include <sys/types.h> 43#include <sys/sbuf.h> 44#include <sys/wait.h> 45 46#include <ctype.h> 47#include <err.h> 48#include <errno.h> 49#include <paths.h> 50#include <signal.h> 51#include <stdio.h> 52#include <stdlib.h> 53#include <string.h> 54#include <unistd.h> 55 56#define ISMAGICNO(p) \ 57 (p)[0] == magic && isdigit((unsigned char)(p)[1]) && (p)[1] != '0' 58 59static int exec_shell(const char *, const char *, const char *); 60static void usage(void); 61 62int 63main(int argc, char *argv[]) 64{ 65 struct sbuf *cmdbuf; 66 long arg_max; 67 int ch, debug, i, magic, n, nargs, rval; 68 size_t cmdsize; 69 char buf[4]; 70 char *cmd, *name, *p, *shell, *slashp, *tmpshell; 71 72 debug = 0; 73 magic = '%'; /* Default magic char is `%'. */ 74 nargs = -1; 75 while ((ch = getopt(argc, argv, "a:d0123456789")) != -1) 76 switch (ch) { 77 case 'a': 78 if (optarg[0] == '\0' || optarg[1] != '\0') 79 errx(1, 80 "illegal magic character specification"); 81 magic = optarg[0]; 82 break; 83 case 'd': 84 debug = 1; 85 break; 86 case '0': case '1': case '2': case '3': case '4': 87 case '5': case '6': case '7': case '8': case '9': 88 if (nargs != -1) 89 errx(1, 90 "only one -# argument may be specified"); 91 nargs = optopt - '0'; 92 break; 93 default: 94 usage(); 95 } 96 argc -= optind; 97 argv += optind; 98 99 if (argc < 2) 100 usage(); 101 102 /* 103 * The command to run is argv[0], and the args are argv[1..]. 104 * Look for %digit references in the command, remembering the 105 * largest one. 106 */ 107 for (n = 0, p = argv[0]; *p != '\0'; ++p) 108 if (ISMAGICNO(p)) { 109 ++p; 110 if (p[0] - '0' > n) 111 n = p[0] - '0'; 112 } 113 114 /* 115 * Figure out the shell and name arguments to pass to execl() 116 * in exec_shell(). Always malloc() shell and just set name 117 * to point at the last part of shell if there are any backslashes, 118 * otherwise just set it to point at the space malloc()'d. If 119 * SHELL environment variable exists, replace contents of 120 * shell with it. 121 */ 122 shell = name = NULL; 123 tmpshell = getenv("SHELL"); 124 shell = (tmpshell != NULL) ? strdup(tmpshell) : strdup(_PATH_BSHELL); 125 if (shell == NULL) 126 err(1, "strdup() failed"); 127 slashp = strrchr(shell, '/'); 128 name = (slashp != NULL) ? slashp + 1 : shell; 129 130 /* 131 * If there were any %digit references, then use those, otherwise 132 * build a new command string with sufficient %digit references at 133 * the end to consume (nargs) arguments each time round the loop. 134 * Allocate enough space to hold the maximum command. Save the 135 * size to pass to snprintf(). 136 */ 137 if (n == 0) { 138 cmdsize = strlen(argv[0]) + 9 * (sizeof(" %1") - 1) + 1; 139 if ((cmd = malloc(cmdsize)) == NULL) 140 err(1, NULL); 141 strlcpy(cmd, argv[0], cmdsize); 142 143 /* If nargs not set, default to a single argument. */ 144 if (nargs == -1) 145 nargs = 1; 146 147 for (i = 1; i <= nargs; i++) { 148 snprintf(buf, sizeof(buf), " %c%d", magic, i); 149 strlcat(cmd, buf, cmdsize); 150 } 151 152 /* 153 * If nargs set to the special value 0, eat a single 154 * argument for each command execution. 155 */ 156 if (nargs == 0) 157 nargs = 1; 158 } else { 159 if ((cmd = strdup(argv[0])) == NULL) 160 err(1, NULL); 161 nargs = n; 162 } 163 164 cmdbuf = sbuf_new(NULL, NULL, 1024, SBUF_AUTOEXTEND); 165 if (cmdbuf == NULL) 166 err(1, NULL); 167 168 arg_max = sysconf(_SC_ARG_MAX); 169 170 /* 171 * (argc) and (argv) are still offset by one to make it simpler to 172 * expand %digit references. At the end of the loop check for (argc) 173 * equals 1 means that all the (argv) has been consumed. 174 */ 175 for (rval = 0; argc > nargs; argc -= nargs, argv += nargs) { 176 sbuf_clear(cmdbuf); 177 sbuf_cat(cmdbuf, "exec "); 178 /* Expand command argv references. */ 179 for (p = cmd; *p != '\0'; ++p) { 180 if (ISMAGICNO(p)) { 181 if (sbuf_cat(cmdbuf, argv[(++p)[0] - '0']) 182 == -1) 183 errc(1, ENOMEM, "sbuf"); 184 } else { 185 if (sbuf_putc(cmdbuf, *p) == -1) 186 errc(1, ENOMEM, "sbuf"); 187 } 188 if (sbuf_len(cmdbuf) > arg_max) 189 errc(1, E2BIG, NULL); 190 } 191 192 /* Terminate the command string. */ 193 sbuf_finish(cmdbuf); 194 195 /* Run the command. */ 196 if (debug) 197 (void)printf("%s\n", sbuf_data(cmdbuf)); 198 else 199 if (exec_shell(sbuf_data(cmdbuf), shell, name)) 200 rval = 1; 201 } 202 203 if (argc != 1) 204 errx(1, "expecting additional argument%s after \"%s\"", 205 (nargs - argc) ? "s" : "", argv[argc - 1]); 206 free(cmd); 207 sbuf_delete(cmdbuf); 208 free(shell); 209 exit(rval); 210} 211 212/* 213 * exec_shell -- 214 * Execute a shell command using passed use_shell and use_name 215 * arguments. 216 */ 217static int 218exec_shell(const char *command, const char *use_shell, const char *use_name) 219{ 220 pid_t pid; 221 int omask, pstat; 222 sig_t intsave, quitsave; 223 224 if (!command) /* just checking... */ 225 return(1); 226 227 omask = sigblock(sigmask(SIGCHLD)); 228 switch(pid = vfork()) { 229 case -1: /* error */ 230 err(1, "vfork"); 231 case 0: /* child */ 232 (void)sigsetmask(omask); 233 execl(use_shell, use_name, "-c", command, (char *)NULL); 234 warn("%s", use_shell); 235 _exit(1); 236 } 237 intsave = signal(SIGINT, SIG_IGN); 238 quitsave = signal(SIGQUIT, SIG_IGN); 239 pid = waitpid(pid, &pstat, 0); 240 (void)sigsetmask(omask); 241 (void)signal(SIGINT, intsave); 242 (void)signal(SIGQUIT, quitsave); 243 return(pid == -1 ? -1 : pstat); 244} 245 246static void 247usage(void) 248{ 249 250 (void)fprintf(stderr, 251 "usage: apply [-a magic] [-d] [-0123456789] command arguments ...\n"); 252 exit(1); 253} 254