Annotation of src/usr.bin/apply/apply.c, Revision 1.6
1.6 ! deraadt 1: /* $OpenBSD: apply.c,v 1.5 1997/08/31 08:25:55 deraadt Exp $ */
1.1 deraadt 2: /* $NetBSD: apply.c,v 1.3 1995/03/25 03:38:23 glass Exp $ */
3:
4: /*-
5: * Copyright (c) 1994
6: * The Regents of the University of California. All rights reserved.
7: *
8: * This code is derived from software contributed to Berkeley by
9: * Jan-Simon Pendry.
10: *
11: * Redistribution and use in source and binary forms, with or without
12: * modification, are permitted provided that the following conditions
13: * are met:
14: * 1. Redistributions of source code must retain the above copyright
15: * notice, this list of conditions and the following disclaimer.
16: * 2. Redistributions in binary form must reproduce the above copyright
17: * notice, this list of conditions and the following disclaimer in the
18: * documentation and/or other materials provided with the distribution.
19: * 3. All advertising materials mentioning features or use of this software
20: * must display the following acknowledgement:
21: * This product includes software developed by the University of
22: * California, Berkeley and its contributors.
23: * 4. Neither the name of the University nor the names of its contributors
24: * may be used to endorse or promote products derived from this software
25: * without specific prior written permission.
26: *
27: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37: * SUCH DAMAGE.
38: */
39:
40: #ifndef lint
41: #if 0
42: static char sccsid[] = "@(#)apply.c 8.4 (Berkeley) 4/4/94";
43: #else
1.6 ! deraadt 44: static char rcsid[] = "$OpenBSD: apply.c,v 1.5 1997/08/31 08:25:55 deraadt Exp $";
1.1 deraadt 45: #endif
46: #endif /* not lint */
47:
48: #include <sys/wait.h>
49:
50: #include <ctype.h>
51: #include <err.h>
52: #include <paths.h>
53: #include <signal.h>
54: #include <stdio.h>
55: #include <stdlib.h>
56: #include <string.h>
57: #include <unistd.h>
58:
59: void usage __P((void));
60: int system __P((const char *));
61:
62: int
63: main(argc, argv)
64: int argc;
65: char *argv[];
66: {
67: int ch, clen, debug, i, l, magic, n, nargs, rval;
68: char *c, *cmd, *p, *q;
69:
70: debug = 0;
71: magic = '%'; /* Default magic char is `%'. */
72: nargs = -1;
1.3 millert 73: while ((ch = getopt(argc, argv, "a:d0123456789")) != -1)
1.1 deraadt 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: * If there were any %digit references, then use those, otherwise
114: * build a new command string with sufficient %digit references at
115: * the end to consume (nargs) arguments each time round the loop.
116: * Allocate enough space to hold the maximum command.
117: */
118: if ((cmd = malloc(sizeof("exec ") - 1 +
119: strlen(argv[0]) + 9 * (sizeof(" %1") - 1) + 1)) == NULL)
120: err(1, NULL);
121:
122: if (n == 0) {
123: /* If nargs not set, default to a single argument. */
124: if (nargs == -1)
125: nargs = 1;
126:
127: p = cmd;
128: p += sprintf(cmd, "exec %s", argv[0]);
129: for (i = 1; i <= nargs; i++)
130: p += sprintf(p, " %c%d", magic, i);
131:
132: /*
133: * If nargs set to the special value 0, eat a single
134: * argument for each command execution.
135: */
136: if (nargs == 0)
137: nargs = 1;
138: } else {
139: (void)sprintf(cmd, "exec %s", argv[0]);
140: nargs = n;
141: }
142:
143: /*
144: * Grab some space in which to build the command. Allocate
145: * as necessary later, but no reason to build it up slowly
146: * for the normal case.
147: */
148: if ((c = malloc(clen = 1024)) == NULL)
149: err(1, NULL);
150:
151: /*
152: * (argc) and (argv) are still offset by one to make it simpler to
153: * expand %digit references. At the end of the loop check for (argc)
154: * equals 1 means that all the (argv) has been consumed.
155: */
156: for (rval = 0; argc > nargs; argc -= nargs, argv += nargs) {
157: /*
158: * Find a max value for the command length, and ensure
159: * there's enough space to build it.
160: */
161: for (l = strlen(cmd), i = 0; i < nargs; i++)
1.6 ! deraadt 162: l += strlen(argv[i+1]);
1.1 deraadt 163: if (l > clen && (c = realloc(c, clen = l)) == NULL)
164: err(1, NULL);
165:
166: /* Expand command argv references. */
167: for (p = cmd, q = c; *p != '\0'; ++p)
168: if (p[0] == magic && isdigit(p[1]) && p[1] != '0')
169: q += sprintf(q, "%s", argv[(++p)[0] - '0']);
170: else
171: *q++ = *p;
172:
173: /* Terminate the command string. */
174: *q = '\0';
175:
176: /* Run the command. */
177: if (debug)
178: (void)printf("%s\n", c);
179: else
180: if (system(c))
181: rval = 1;
182: }
183:
184: if (argc != 1)
185: errx(1, "expecting additional argument%s after \"%s\"",
186: (nargs - argc) ? "s" : "", argv[argc - 1]);
187: exit(rval);
188: }
189:
190: /*
191: * system --
192: * Private version of system(3). Use the user's SHELL environment
193: * variable as the shell to execute.
194: */
195: int
196: system(command)
197: const char *command;
198: {
199: static char *name, *shell;
200: pid_t pid;
1.5 deraadt 201: int omask, pstat;
1.1 deraadt 202: sig_t intsave, quitsave;
203:
204: if (shell == NULL) {
205: if ((shell = getenv("SHELL")) == NULL)
206: shell = _PATH_BSHELL;
207: if ((name = strrchr(shell, '/')) == NULL)
208: name = shell;
209: else
210: ++name;
211: }
212: if (!command) /* just checking... */
213: return(1);
214:
215: omask = sigblock(sigmask(SIGCHLD));
1.4 bitblt 216: switch(pid = fork()) {
1.1 deraadt 217: case -1: /* error */
218: err(1, "fork");
219: case 0: /* child */
220: (void)sigsetmask(omask);
221: execl(shell, name, "-c", command, NULL);
222: err(1, "%s", shell);
223: }
224: intsave = signal(SIGINT, SIG_IGN);
225: quitsave = signal(SIGQUIT, SIG_IGN);
1.5 deraadt 226: pid = waitpid(pid, &pstat, 0);
1.1 deraadt 227: (void)sigsetmask(omask);
228: (void)signal(SIGINT, intsave);
229: (void)signal(SIGQUIT, quitsave);
1.5 deraadt 230: return(pid == -1 ? -1 : pstat);
1.1 deraadt 231: }
232:
233: void
234: usage()
235: {
236:
237: (void)fprintf(stderr,
238: "usage: apply [-a magic] [-0123456789] command arguments ...\n");
239: exit(1);
240: }
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