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
35 static char sccsid[] = "@(#)apply.c 8.4 (Berkeley) 4/4/94";
36 #endif
37 #endif
38
39 #include <sys/cdefs.h>
40 __FBSDID("$FreeBSD$");
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 EXEC "exec "
57
58 static int exec_shell(const char *, const char *, const char *);
59 static void usage(void);
60
61 int
main(int argc,char * argv[])62 main(int argc, char *argv[])
63 {
64 struct sbuf *cmdbuf;
65 long arg_max;
66 int ch, debug, i, magic, n, nargs, offset, rval;
67 size_t cmdsize;
68 char *cmd, *name, *p, *shell, *slashp, *tmpshell;
69
70 debug = 0;
71 magic = '%'; /* Default magic char is `%'. */
72 nargs = -1;
73 while ((ch = getopt(argc, argv, "a:d0123456789")) != -1)
74 switch (ch) {
75 case 'a':
76 if (optarg[1] != '\0')
77 errx(1,
78 "illegal magic character specification");
79 magic = optarg[0];
80 break;
81 case 'd':
82 debug = 1;
83 break;
84 case '0': case '1': case '2': case '3': case '4':
85 case '5': case '6': case '7': case '8': case '9':
86 if (nargs != -1)
87 errx(1,
88 "only one -# argument may be specified");
89 nargs = optopt - '0';
90 break;
91 default:
92 usage();
93 }
94 argc -= optind;
95 argv += optind;
96
97 if (argc < 2)
98 usage();
99
100 /*
101 * The command to run is argv[0], and the args are argv[1..].
102 * Look for %digit references in the command, remembering the
103 * largest one.
104 */
105 for (n = 0, p = argv[0]; *p != '\0'; ++p)
106 if (p[0] == magic && isdigit(p[1]) && p[1] != '0') {
107 ++p;
108 if (p[0] - '0' > n)
109 n = p[0] - '0';
110 }
111
112 /*
113 * Figure out the shell and name arguments to pass to execl()
114 * in exec_shell(). Always malloc() shell and just set name
115 * to point at the last part of shell if there are any backslashes,
116 * otherwise just set it to point at the space malloc()'d. If
117 * SHELL environment variable exists, replace contents of
118 * shell with it.
119 */
120 shell = name = NULL;
121 tmpshell = getenv("SHELL");
122 shell = (tmpshell != NULL) ? strdup(tmpshell) : strdup(_PATH_BSHELL);
123 if (shell == NULL)
124 err(1, "strdup() failed");
125 slashp = strrchr(shell, '/');
126 name = (slashp != NULL) ? slashp + 1 : shell;
127
128 /*
129 * If there were any %digit references, then use those, otherwise
130 * build a new command string with sufficient %digit references at
131 * the end to consume (nargs) arguments each time round the loop.
132 * Allocate enough space to hold the maximum command. Save the
133 * size to pass to snprintf().
134 */
135 cmdsize = sizeof(EXEC) - 1 + strlen(argv[0])
136 + 9 * (sizeof(" %1") - 1) + 1;
137 if ((cmd = malloc(cmdsize)) == NULL)
138 err(1, NULL);
139
140 if (n == 0) {
141 /* If nargs not set, default to a single argument. */
142 if (nargs == -1)
143 nargs = 1;
144
145 p = cmd;
146 offset = snprintf(cmd, cmdsize, EXEC "%s", argv[0]);
147 if ((size_t)offset >= cmdsize)
148 errx(1, "snprintf() failed");
149 p += offset;
150 cmdsize -= offset;
151 for (i = 1; i <= nargs; i++) {
152 offset = snprintf(p, cmdsize, " %c%d", magic, i);
153 if ((size_t)offset >= cmdsize)
154 errx(1, "snprintf() failed");
155 p += offset;
156 cmdsize -= offset;
157 }
158
159 /*
160 * If nargs set to the special value 0, eat a single
161 * argument for each command execution.
162 */
163 if (nargs == 0)
164 nargs = 1;
165 } else {
166 offset = snprintf(cmd, cmdsize, EXEC "%s", argv[0]);
167 if ((size_t)offset >= cmdsize)
168 errx(1, "snprintf() failed");
169 nargs = n;
170 }
171
172 cmdbuf = sbuf_new(NULL, NULL, 1024, SBUF_AUTOEXTEND);
173 if (cmdbuf == NULL)
174 err(1, NULL);
175
176 arg_max = sysconf(_SC_ARG_MAX);
177
178 /*
179 * (argc) and (argv) are still offset by one to make it simpler to
180 * expand %digit references. At the end of the loop check for (argc)
181 * equals 1 means that all the (argv) has been consumed.
182 */
183 for (rval = 0; argc > nargs; argc -= nargs, argv += nargs) {
184 sbuf_clear(cmdbuf);
185 /* Expand command argv references. */
186 for (p = cmd; *p != '\0'; ++p) {
187 if (p[0] == magic && isdigit(p[1]) && p[1] != '0') {
188 if (sbuf_cat(cmdbuf, argv[(++p)[0] - '0'])
189 == -1)
190 errc(1, ENOMEM, "sbuf");
191 } else {
192 if (sbuf_putc(cmdbuf, *p) == -1)
193 errc(1, ENOMEM, "sbuf");
194 }
195 if (sbuf_len(cmdbuf) > arg_max)
196 errc(1, E2BIG, NULL);
197 }
198
199 /* Terminate the command string. */
200 sbuf_finish(cmdbuf);
201
202 /* Run the command. */
203 if (debug)
204 (void)printf("%s\n", sbuf_data(cmdbuf));
205 else
206 if (exec_shell(sbuf_data(cmdbuf), shell, name))
207 rval = 1;
208 }
209
210 if (argc != 1)
211 errx(1, "expecting additional argument%s after \"%s\"",
212 (nargs - argc) ? "s" : "", argv[argc - 1]);
213 free(cmd);
214 sbuf_delete(cmdbuf);
215 free(shell);
216 exit(rval);
217 }
218
219 /*
220 * exec_shell --
221 * Execute a shell command using passed use_shell and use_name
222 * arguments.
223 */
224 static int
exec_shell(const char * command,const char * use_shell,const char * use_name)225 exec_shell(const char *command, const char *use_shell, const char *use_name)
226 {
227 pid_t pid;
228 int omask, pstat;
229 sig_t intsave, quitsave;
230
231 if (!command) /* just checking... */
232 return(1);
233
234 omask = sigblock(sigmask(SIGCHLD));
235 switch(pid = vfork()) {
236 case -1: /* error */
237 err(1, "vfork");
238 case 0: /* child */
239 (void)sigsetmask(omask);
240 execl(use_shell, use_name, "-c", command, (char *)NULL);
241 warn("%s", use_shell);
242 _exit(1);
243 }
244 intsave = signal(SIGINT, SIG_IGN);
245 quitsave = signal(SIGQUIT, SIG_IGN);
246 pid = waitpid(pid, &pstat, 0);
247 (void)sigsetmask(omask);
248 (void)signal(SIGINT, intsave);
249 (void)signal(SIGQUIT, quitsave);
250 return(pid == -1 ? -1 : pstat);
251 }
252
253 static void
usage(void)254 usage(void)
255 {
256
257 (void)fprintf(stderr,
258 "usage: apply [-a magic] [-d] [-0123456789] command arguments ...\n");
259 exit(1);
260 }
261