apply.c revision 1591
156893Sfenner/*- 256893Sfenner * Copyright (c) 1994 356893Sfenner * The Regents of the University of California. All rights reserved. 456893Sfenner * 556893Sfenner * This code is derived from software contributed to Berkeley by 656893Sfenner * Jan-Simon Pendry. 756893Sfenner * 856893Sfenner * Redistribution and use in source and binary forms, with or without 956893Sfenner * modification, are permitted provided that the following conditions 1056893Sfenner * are met: 1156893Sfenner * 1. Redistributions of source code must retain the above copyright 1256893Sfenner * notice, this list of conditions and the following disclaimer. 1356893Sfenner * 2. Redistributions in binary form must reproduce the above copyright 1456893Sfenner * notice, this list of conditions and the following disclaimer in the 1556893Sfenner * documentation and/or other materials provided with the distribution. 1656893Sfenner * 3. All advertising materials mentioning features or use of this software 1756893Sfenner * must display the following acknowledgement: 1856893Sfenner * This product includes software developed by the University of 1956893Sfenner * California, Berkeley and its contributors. 2056893Sfenner * 4. Neither the name of the University nor the names of its contributors 2156893Sfenner * may be used to endorse or promote products derived from this software 2256893Sfenner * without specific prior written permission. 23127668Sbms * 24190207Srpaulo * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 2556893Sfenner * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2656893Sfenner * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2756893Sfenner * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 2856893Sfenner * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2956893Sfenner * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 3056893Sfenner * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 3156893Sfenner * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 3256893Sfenner * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33127668Sbms * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3456893Sfenner * SUCH DAMAGE. 3556893Sfenner */ 3656893Sfenner 3756893Sfenner#ifndef lint 3856893Sfennerstatic char sccsid[] = "@(#)apply.c 8.4 (Berkeley) 4/4/94"; 39127668Sbms#endif /* not lint */ 4056893Sfenner 41146773Ssam#include <sys/wait.h> 42146773Ssam 43146773Ssam#include <ctype.h> 44146773Ssam#include <err.h> 45146773Ssam#include <paths.h> 46146773Ssam#include <signal.h> 47146773Ssam#include <stdio.h> 48146773Ssam#include <stdlib.h> 4956893Sfenner#include <string.h> 5056893Sfenner#include <unistd.h> 5156893Sfenner 5256893Sfennervoid usage __P((void)); 5356893Sfennerint system __P((const char *)); 5456893Sfenner 55127668Sbmsint 5656893Sfennermain(argc, argv) 5756893Sfenner int argc; 5856893Sfenner char *argv[]; 5956893Sfenner{ 6056893Sfenner int ch, clen, debug, i, l, magic, n, nargs, rval; 6156893Sfenner char *c, *cmd, *p, *q; 6298524Sfenner 6356893Sfenner debug = 0; 6456893Sfenner magic = '%'; /* Default magic char is `%'. */ 6556893Sfenner nargs = -1; 66127668Sbms while ((ch = getopt(argc, argv, "a:d0123456789")) != EOF) 67127668Sbms switch (ch) { 6856893Sfenner case 'a': 6956893Sfenner if (optarg[1] != '\0') 7056893Sfenner errx(1, 71127668Sbms "illegal magic character specification."); 7256893Sfenner magic = optarg[0]; 73127668Sbms break; 74127668Sbms case 'd': 75127668Sbms debug = 1; 76127668Sbms break; 77127668Sbms case '0': case '1': case '2': case '3': case '4': 7856893Sfenner case '5': case '6': case '7': case '8': case '9': 7956893Sfenner if (nargs != -1) 8056893Sfenner errx(1, 8156893Sfenner "only one -# argument may be specified."); 8256893Sfenner nargs = optopt - '0'; 8356893Sfenner break; 8456893Sfenner default: 8556893Sfenner usage(); 8656893Sfenner } 8756893Sfenner argc -= optind; 8856893Sfenner argv += optind; 8956893Sfenner 9098524Sfenner if (argc < 2) 9156893Sfenner usage(); 9256893Sfenner 9356893Sfenner /* 94127668Sbms * The command to run is argv[0], and the args are argv[1..]. 95127668Sbms * Look for %digit references in the command, remembering the 9698524Sfenner * largest one. 9756893Sfenner */ 9856893Sfenner for (n = 0, p = argv[0]; *p != '\0'; ++p) 9956893Sfenner if (p[0] == magic && isdigit(p[1]) && p[1] != '0') { 10056893Sfenner ++p; 10156893Sfenner if (p[0] - '0' > n) 10256893Sfenner n = p[0] - '0'; 10356893Sfenner } 10456893Sfenner 10556893Sfenner /* 10698524Sfenner * If there were any %digit references, then use those, otherwise 10756893Sfenner * build a new command string with sufficient %digit references at 10856893Sfenner * the end to consume (nargs) arguments each time round the loop. 10956893Sfenner * Allocate enough space to hold the maximum command. 110127668Sbms */ 111127668Sbms if ((cmd = malloc(sizeof("exec ") - 1 + 11298524Sfenner strlen(argv[0]) + 9 * (sizeof(" %1") - 1) + 1)) == NULL) 11356893Sfenner err(1, NULL); 11456893Sfenner 11556893Sfenner if (n == 0) { 11656893Sfenner /* If nargs not set, default to a single argument. */ 11756893Sfenner if (nargs == -1) 11856893Sfenner nargs = 1; 11998524Sfenner 12056893Sfenner p = cmd; 12156893Sfenner p += sprintf(cmd, "exec %s", argv[0]); 12298524Sfenner for (i = 1; i <= nargs; i++) 12356893Sfenner p += sprintf(p, " %c%d", magic, i); 12456893Sfenner 12556893Sfenner /* 12656893Sfenner * If nargs set to the special value 0, eat a single 12756893Sfenner * argument for each command execution. 12856893Sfenner */ 129 if (nargs == 0) 130 nargs = 1; 131 } else { 132 (void)sprintf(cmd, "exec %s", argv[0]); 133 nargs = n; 134 } 135 136 /* 137 * Grab some space in which to build the command. Allocate 138 * as necessary later, but no reason to build it up slowly 139 * for the normal case. 140 */ 141 if ((c = malloc(clen = 1024)) == NULL) 142 err(1, NULL); 143 144 /* 145 * (argc) and (argv) are still offset by one to make it simpler to 146 * expand %digit references. At the end of the loop check for (argc) 147 * equals 1 means that all the (argv) has been consumed. 148 */ 149 for (rval = 0; argc > nargs; argc -= nargs, argv += nargs) { 150 /* 151 * Find a max value for the command length, and ensure 152 * there's enough space to build it. 153 */ 154 for (l = strlen(cmd), i = 0; i < nargs; i++) 155 l += strlen(argv[i]); 156 if (l > clen && (c = realloc(c, clen = l)) == NULL) 157 err(1, NULL); 158 159 /* Expand command argv references. */ 160 for (p = cmd, q = c; *p != '\0'; ++p) 161 if (p[0] == magic && isdigit(p[1]) && p[1] != '0') 162 q += sprintf(q, "%s", argv[(++p)[0] - '0']); 163 else 164 *q++ = *p; 165 166 /* Terminate the command string. */ 167 *q = '\0'; 168 169 /* Run the command. */ 170 if (debug) 171 (void)printf("%s\n", c); 172 else 173 if (system(c)) 174 rval = 1; 175 } 176 177 if (argc != 1) 178 errx(1, "expecting additional argument%s after \"%s\"", 179 (nargs - argc) ? "s" : "", argv[argc - 1]); 180 exit(rval); 181} 182 183/* 184 * system -- 185 * Private version of system(3). Use the user's SHELL environment 186 * variable as the shell to execute. 187 */ 188int 189system(command) 190 const char *command; 191{ 192 static char *name, *shell; 193 union wait pstat; 194 pid_t pid; 195 int omask; 196 sig_t intsave, quitsave; 197 198 if (shell == NULL) { 199 if ((shell = getenv("SHELL")) == NULL) 200 shell = _PATH_BSHELL; 201 if ((name = strrchr(shell, '/')) == NULL) 202 name = shell; 203 else 204 ++name; 205 } 206 if (!command) /* just checking... */ 207 return(1); 208 209 omask = sigblock(sigmask(SIGCHLD)); 210 switch(pid = vfork()) { 211 case -1: /* error */ 212 err(1, "fork"); 213 case 0: /* child */ 214 (void)sigsetmask(omask); 215 execl(shell, name, "-c", command, NULL); 216 err(1, "%s", shell); 217 } 218 intsave = signal(SIGINT, SIG_IGN); 219 quitsave = signal(SIGQUIT, SIG_IGN); 220 pid = waitpid(pid, (int *)&pstat, 0); 221 (void)sigsetmask(omask); 222 (void)signal(SIGINT, intsave); 223 (void)signal(SIGQUIT, quitsave); 224 return(pid == -1 ? -1 : pstat.w_status); 225} 226 227void 228usage() 229{ 230 231 (void)fprintf(stderr, 232 "usage: apply [-a magic] [-0123456789] command arguments ...\n"); 233 exit(1); 234} 235