apply.c revision 82057
115177Snate/*- 215284Snate * Copyright (c) 1994 315284Snate * The Regents of the University of California. All rights reserved. 415284Snate * 515284Snate * This code is derived from software contributed to Berkeley by 615284Snate * Jan-Simon Pendry. 715284Snate * 815284Snate * Redistribution and use in source and binary forms, with or without 915284Snate * modification, are permitted provided that the following conditions 1015284Snate * are met: 1115284Snate * 1. Redistributions of source code must retain the above copyright 1215284Snate * notice, this list of conditions and the following disclaimer. 1315284Snate * 2. Redistributions in binary form must reproduce the above copyright 1415284Snate * notice, this list of conditions and the following disclaimer in the 1515284Snate * documentation and/or other materials provided with the distribution. 1615284Snate * 3. All advertising materials mentioning features or use of this software 1715284Snate * must display the following acknowledgement: 1815284Snate * This product includes software developed by the University of 1915284Snate * California, Berkeley and its contributors. 2015284Snate * 4. Neither the name of the University nor the names of its contributors 2115284Snate * may be used to endorse or promote products derived from this software 2215284Snate * without specific prior written permission. 2315284Snate * 2415284Snate * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 2510217Sphk * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2630171Scharnier * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2730171Scharnier * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 2830171Scharnier * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2950479Speter * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 3030171Scharnier * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 3130171Scharnier * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 3259656Siwasaki * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3359656Siwasaki * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3459656Siwasaki * SUCH DAMAGE. 3559656Siwasaki */ 3659656Siwasaki 3730171Scharnier#ifndef lint 3810217Sphk#if 0 3910217Sphkstatic const char sccsid[] = "@(#)apply.c 8.4 (Berkeley) 4/4/94"; 4010217Sphk#endif 4130171Scharnierstatic const char rcsid[] = 4210217Sphk "$FreeBSD: head/usr.bin/apply/apply.c 82057 2001-08-21 12:54:15Z brian $"; 4331290Snate#endif /* not lint */ 4410217Sphk 4510217Sphk#include <sys/types.h> 4610217Sphk 4710217Sphk#include <sys/wait.h> 4816487Snate 4916487Snate#include <ctype.h> 5016487Snate#include <err.h> 5116487Snate#include <paths.h> 5216487Snate#include <signal.h> 5310217Sphk#include <stdio.h> 5416487Snate#include <stdlib.h> 55185124Simp#include <string.h> 56185124Simp#include <unistd.h> 57185124Simp 58185124Simp#define EXEC "exec " 59185124Simp 60185124Simpstatic int exec_shell(const char *, char *, char *); 61185124Simpstatic void usage(void); 62185124Simp 63185124Simpint 64185124Simpmain(int argc, char *argv[]) { 65185124Simp int ch, debug, i, magic, n, nargs, offset, rval; 66185124Simp size_t clen, cmdsize, l; 67185124Simp char *c, *cmd, *name, *p, *q, *shell, *slashp, *tmpshell; 68185124Simp 69185124Simp debug = 0; 70185124Simp magic = '%'; /* Default magic char is `%'. */ 71185124Simp nargs = -1; 72185124Simp while ((ch = getopt(argc, argv, "a:d0123456789")) != -1) 73185124Simp switch (ch) { 74185124Simp case 'a': 75185124Simp if (optarg[1] != '\0') 76185124Simp errx(1, 77185124Simp "illegal magic character specification"); 78185124Simp magic = optarg[0]; 79185124Simp break; 80185124Simp case 'd': 81185124Simp debug = 1; 82185124Simp break; 83185124Simp case '0': case '1': case '2': case '3': case '4': 84185124Simp case '5': case '6': case '7': case '8': case '9': 85185124Simp if (nargs != -1) 86185124Simp errx(1, 87185124Simp "only one -# argument may be specified"); 88185124Simp nargs = optopt - '0'; 89185124Simp break; 90185124Simp default: 9115177Snate usage(); 9215177Snate } 9310217Sphk argc -= optind; 94185033Simp argv += optind; 95185033Simp 96185033Simp if (argc < 2) 97185033Simp usage(); 98185033Simp 99185033Simp /* 100185033Simp * The command to run is argv[0], and the args are argv[1..]. 101185033Simp * Look for %digit references in the command, remembering the 102185033Simp * largest one. 103185033Simp */ 104185033Simp for (n = 0, p = argv[0]; *p != '\0'; ++p) 105185033Simp if (p[0] == magic && isdigit(p[1]) && p[1] != '0') { 106185033Simp ++p; 107185033Simp if (p[0] - '0' > n) 10810217Sphk n = p[0] - '0'; 10910217Sphk } 11010217Sphk 111185121Simp /* 11210217Sphk * Figure out the shell and name arguments to pass to execl() 11310217Sphk * in exec_shell(). Always malloc() shell and just set name 11410217Sphk * to point at the last part of shell if there are any backslashes, 115185121Simp * otherwise just set it to point at the space malloc()'d. If 11610217Sphk * SHELL environment variable exists, replace contents of 11715177Snate * shell with it. 11810217Sphk */ 11910217Sphk shell = name = NULL; 12010217Sphk tmpshell = getenv("SHELL"); 12110217Sphk shell = (tmpshell != NULL) ? strdup(tmpshell) : strdup(_PATH_BSHELL); 122185121Simp if (shell == NULL) 12310217Sphk err(1, "strdup() failed"); 124185121Simp slashp = strrchr(shell, '/'); 12515177Snate name = (slashp != NULL) ? slashp + 1 : shell; 12610217Sphk 127185121Simp /* 128185121Simp * If there were any %digit references, then use those, otherwise 12915177Snate * build a new command string with sufficient %digit references at 13010217Sphk * the end to consume (nargs) arguments each time round the loop. 131185121Simp * Allocate enough space to hold the maximum command. Save the 132185121Simp * size to pass to snprintf(). 13310217Sphk */ 134185121Simp cmdsize = sizeof(EXEC) - 1 + strlen(argv[0]) 13515177Snate + 9 * (sizeof(" %1") - 1) + 1; 13610217Sphk if ((cmd = malloc(cmdsize)) == NULL) 13715177Snate err(1, NULL); 13810217Sphk 13959656Siwasaki if (n == 0) { 14059656Siwasaki /* If nargs not set, default to a single argument. */ 14159656Siwasaki if (nargs == -1) 14259656Siwasaki nargs = 1; 14359656Siwasaki 14459656Siwasaki p = cmd; 14559656Siwasaki offset = snprintf(cmd, cmdsize, EXEC "%s", argv[0]); 14659656Siwasaki if ((size_t)offset >= cmdsize) 14759656Siwasaki err(1, "snprintf() failed"); 14859656Siwasaki p += offset; 14959656Siwasaki cmdsize -= offset; 15059656Siwasaki for (i = 1; i <= nargs; i++) { 15159656Siwasaki offset = snprintf(p, cmdsize, " %c%d", magic, i); 15259656Siwasaki if ((size_t)offset >= cmdsize) 15359656Siwasaki err(1, "snprintf() failed"); 15459656Siwasaki p += offset; 15559656Siwasaki cmdsize -= offset; 15659656Siwasaki } 15759656Siwasaki 15859656Siwasaki /* 15959656Siwasaki * If nargs set to the special value 0, eat a single 16059656Siwasaki * argument for each command execution. 16159656Siwasaki */ 16259656Siwasaki if (nargs == 0) 16359656Siwasaki nargs = 1; 16459656Siwasaki } else { 16559656Siwasaki offset = snprintf(cmd, cmdsize, EXEC "%s", argv[0]); 16659656Siwasaki if ((size_t)offset >= cmdsize) 16759656Siwasaki err(1, "snprintf() failed"); 16859656Siwasaki nargs = n; 16959656Siwasaki } 17059656Siwasaki 17159656Siwasaki /* 17259656Siwasaki * Grab some space in which to build the command. Allocate 17359656Siwasaki * as necessary later, but no reason to build it up slowly 17459656Siwasaki * for the normal case. 17510217Sphk */ 17610217Sphk if ((c = malloc(clen = 1024)) == NULL) 17710217Sphk err(1, NULL); 17810217Sphk 17910217Sphk /* 18010217Sphk * (argc) and (argv) are still offset by one to make it simpler to 18110217Sphk * expand %digit references. At the end of the loop check for (argc) 18210217Sphk * equals 1 means that all the (argv) has been consumed. 18310217Sphk */ 18410217Sphk for (rval = 0; argc > nargs; argc -= nargs, argv += nargs) { 18510217Sphk /* 18610217Sphk * Find a max value for the command length, and ensure 18710217Sphk * there's enough space to build it. 18810217Sphk */ 18910217Sphk for (l = strlen(cmd), i = 0; i < nargs; i++) 19010217Sphk l += strlen(argv[i+1]); 19110217Sphk if (l > clen && (c = realloc(c, clen = l)) == NULL) 19216487Snate err(1, NULL); 19310217Sphk 19410217Sphk /* Expand command argv references. */ 19515177Snate for (p = cmd, q = c; *p != '\0'; ++p) 19615177Snate if (p[0] == magic && isdigit(p[1]) && p[1] != '0') { 19715177Snate offset = snprintf(q, l, "%s", 19815177Snate argv[(++p)[0] - '0']); 19910217Sphk if ((size_t)offset >= l) 20010217Sphk err(1, "snprintf() failed"); 20115177Snate q += offset; 20215177Snate l -= offset; 20315177Snate } else 20415177Snate *q++ = *p; 20510217Sphk 20610217Sphk /* Terminate the command string. */ 20715177Snate *q = '\0'; 20810217Sphk 20910217Sphk /* Run the command. */ 21015177Snate if (debug) 21115177Snate (void)printf("%s\n", c); 21259656Siwasaki else 21310217Sphk if (exec_shell(c, shell, name)) 214185121Simp rval = 1; 21515177Snate } 21610217Sphk 21715177Snate if (argc != 1) 21815177Snate errx(1, "expecting additional argument%s after \"%s\"", 21910217Sphk (nargs - argc) ? "s" : "", argv[argc - 1]); 22010217Sphk free(cmd); 22110217Sphk free(c); 22210217Sphk free(shell); 22335310Snate exit(rval); 22435310Snate} 22515177Snate 22615177Snate/* 22715177Snate * exec_shell -- 22815177Snate * Execute a shell command using passed use_shell and use_name 22915177Snate * arguments. 23015177Snate */ 231185124Simpstatic int 232185124Simpexec_shell(const char *command, char *use_shell, char *use_name) 23315177Snate{ 234185121Simp pid_t pid; 23510217Sphk int omask, pstat; 236185121Simp sig_t intsave, quitsave; 23715177Snate 23810217Sphk if (!command) /* just checking... */ 239185121Simp return(1); 24015177Snate 24115177Snate omask = sigblock(sigmask(SIGCHLD)); 24210217Sphk switch(pid = vfork()) { 24315177Snate case -1: /* error */ 24410217Sphk err(1, "vfork"); 24510217Sphk case 0: /* child */ 24610217Sphk (void)sigsetmask(omask); 24716487Snate execl(use_shell, use_name, "-c", command, (char *)NULL); 24810217Sphk warn("%s", use_shell); 24910217Sphk _exit(1); 25015177Snate } 25115177Snate intsave = signal(SIGINT, SIG_IGN); 25215177Snate quitsave = signal(SIGQUIT, SIG_IGN); 25315177Snate pid = waitpid(pid, &pstat, 0); 25415177Snate (void)sigsetmask(omask); 25510217Sphk (void)signal(SIGINT, intsave); 25615177Snate (void)signal(SIGQUIT, quitsave); 25710217Sphk return(pid == -1 ? -1 : pstat); 25810217Sphk} 25915177Snate 26010217Sphkvoid 26110217Sphkusage() 26210217Sphk{ 263185123Simp 26410217Sphk (void)fprintf(stderr, 26515177Snate "usage: apply [-a magic] [-d] [-0123456789] command arguments ...\n"); 266185033Simp exit(1); 26730171Scharnier} 26810217Sphk