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 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #ifndef lint 38 /*static char sccsid[] = "@(#)apply.c 8.4 (Berkeley) 4/4/94";*/ 39 static char rcsid[] = "$Id: apply.c,v 1.2 1994/09/21 03:17:36 glass Exp $"; 40 #endif /* not lint */ 41 42 #include <sys/wait.h> 43 44 #include <ctype.h> 45 #include <err.h> 46 #include <paths.h> 47 #include <signal.h> 48 #include <stdio.h> 49 #include <stdlib.h> 50 #include <string.h> 51 #include <unistd.h> 52 53 void usage __P((void)); 54 int system __P((const char *)); 55 56 int 57 main(argc, argv) 58 int argc; 59 char *argv[]; 60 { 61 int ch, clen, debug, i, l, magic, n, nargs, rval; 62 char *c, *cmd, *p, *q; 63 64 debug = 0; 65 magic = '%'; /* Default magic char is `%'. */ 66 nargs = -1; 67 while ((ch = getopt(argc, argv, "a:d0123456789")) != EOF) 68 switch (ch) { 69 case 'a': 70 if (optarg[1] != '\0') 71 errx(1, 72 "illegal magic character specification."); 73 magic = optarg[0]; 74 break; 75 case 'd': 76 debug = 1; 77 break; 78 case '0': case '1': case '2': case '3': case '4': 79 case '5': case '6': case '7': case '8': case '9': 80 if (nargs != -1) 81 errx(1, 82 "only one -# argument may be specified."); 83 nargs = optopt - '0'; 84 break; 85 default: 86 usage(); 87 } 88 argc -= optind; 89 argv += optind; 90 91 if (argc < 2) 92 usage(); 93 94 /* 95 * The command to run is argv[0], and the args are argv[1..]. 96 * Look for %digit references in the command, remembering the 97 * largest one. 98 */ 99 for (n = 0, p = argv[0]; *p != '\0'; ++p) 100 if (p[0] == magic && isdigit(p[1]) && p[1] != '0') { 101 ++p; 102 if (p[0] - '0' > n) 103 n = p[0] - '0'; 104 } 105 106 /* 107 * If there were any %digit references, then use those, otherwise 108 * build a new command string with sufficient %digit references at 109 * the end to consume (nargs) arguments each time round the loop. 110 * Allocate enough space to hold the maximum command. 111 */ 112 if ((cmd = malloc(sizeof("exec ") - 1 + 113 strlen(argv[0]) + 9 * (sizeof(" %1") - 1) + 1)) == NULL) 114 err(1, NULL); 115 116 if (n == 0) { 117 /* If nargs not set, default to a single argument. */ 118 if (nargs == -1) 119 nargs = 1; 120 121 p = cmd; 122 p += sprintf(cmd, "exec %s", argv[0]); 123 for (i = 1; i <= nargs; i++) 124 p += sprintf(p, " %c%d", magic, i); 125 126 /* 127 * If nargs set to the special value 0, eat a single 128 * argument for each command execution. 129 */ 130 if (nargs == 0) 131 nargs = 1; 132 } else { 133 (void)sprintf(cmd, "exec %s", argv[0]); 134 nargs = n; 135 } 136 137 /* 138 * Grab some space in which to build the command. Allocate 139 * as necessary later, but no reason to build it up slowly 140 * for the normal case. 141 */ 142 if ((c = malloc(clen = 1024)) == NULL) 143 err(1, NULL); 144 145 /* 146 * (argc) and (argv) are still offset by one to make it simpler to 147 * expand %digit references. At the end of the loop check for (argc) 148 * equals 1 means that all the (argv) has been consumed. 149 */ 150 for (rval = 0; argc > nargs; argc -= nargs, argv += nargs) { 151 /* 152 * Find a max value for the command length, and ensure 153 * there's enough space to build it. 154 */ 155 for (l = strlen(cmd), i = 0; i < nargs; i++) 156 l += strlen(argv[i]); 157 if (l > clen && (c = realloc(c, clen = l)) == NULL) 158 err(1, NULL); 159 160 /* Expand command argv references. */ 161 for (p = cmd, q = c; *p != '\0'; ++p) 162 if (p[0] == magic && isdigit(p[1]) && p[1] != '0') 163 q += sprintf(q, "%s", argv[(++p)[0] - '0']); 164 else 165 *q++ = *p; 166 167 /* Terminate the command string. */ 168 *q = '\0'; 169 170 /* Run the command. */ 171 if (debug) 172 (void)printf("%s\n", c); 173 else 174 if (system(c)) 175 rval = 1; 176 } 177 178 if (argc != 1) 179 errx(1, "expecting additional argument%s after \"%s\"", 180 (nargs - argc) ? "s" : "", argv[argc - 1]); 181 exit(rval); 182 } 183 184 /* 185 * system -- 186 * Private version of system(3). Use the user's SHELL environment 187 * variable as the shell to execute. 188 */ 189 int 190 system(command) 191 const char *command; 192 { 193 static char *name, *shell; 194 union wait pstat; 195 pid_t pid; 196 int omask; 197 sig_t intsave, quitsave; 198 199 if (shell == NULL) { 200 if ((shell = getenv("SHELL")) == NULL) 201 shell = _PATH_BSHELL; 202 if ((name = strrchr(shell, '/')) == NULL) 203 name = shell; 204 else 205 ++name; 206 } 207 if (!command) /* just checking... */ 208 return(1); 209 210 omask = sigblock(sigmask(SIGCHLD)); 211 switch(pid = vfork()) { 212 case -1: /* error */ 213 err(1, "fork"); 214 case 0: /* child */ 215 (void)sigsetmask(omask); 216 execl(shell, name, "-c", command, NULL); 217 err(1, "%s", shell); 218 } 219 intsave = signal(SIGINT, SIG_IGN); 220 quitsave = signal(SIGQUIT, SIG_IGN); 221 pid = waitpid(pid, (int *)&pstat, 0); 222 (void)sigsetmask(omask); 223 (void)signal(SIGINT, intsave); 224 (void)signal(SIGQUIT, quitsave); 225 return(pid == -1 ? -1 : pstat.w_status); 226 } 227 228 void 229 usage() 230 { 231 232 (void)fprintf(stderr, 233 "usage: apply [-a magic] [-0123456789] command arguments ...\n"); 234 exit(1); 235 } 236