Annotation of src/usr.bin/apply/apply.c, Revision 1.1.1.1
1.1 deraadt 1: /* $NetBSD: apply.c,v 1.3 1995/03/25 03:38:23 glass Exp $ */
2:
3: /*-
4: * Copyright (c) 1994
5: * The Regents of the University of California. All rights reserved.
6: *
7: * This code is derived from software contributed to Berkeley by
8: * Jan-Simon Pendry.
9: *
10: * Redistribution and use in source and binary forms, with or without
11: * modification, are permitted provided that the following conditions
12: * are met:
13: * 1. Redistributions of source code must retain the above copyright
14: * notice, this list of conditions and the following disclaimer.
15: * 2. Redistributions in binary form must reproduce the above copyright
16: * notice, this list of conditions and the following disclaimer in the
17: * documentation and/or other materials provided with the distribution.
18: * 3. All advertising materials mentioning features or use of this software
19: * must display the following acknowledgement:
20: * This product includes software developed by the University of
21: * California, Berkeley and its contributors.
22: * 4. Neither the name of the University nor the names of its contributors
23: * may be used to endorse or promote products derived from this software
24: * without specific prior written permission.
25: *
26: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36: * SUCH DAMAGE.
37: */
38:
39: #ifndef lint
40: #if 0
41: static char sccsid[] = "@(#)apply.c 8.4 (Berkeley) 4/4/94";
42: #else
43: static char rcsid[] = "$NetBSD: apply.c,v 1.3 1995/03/25 03:38:23 glass Exp $";
44: #endif
45: #endif /* not lint */
46:
47: #include <sys/wait.h>
48:
49: #include <ctype.h>
50: #include <err.h>
51: #include <paths.h>
52: #include <signal.h>
53: #include <stdio.h>
54: #include <stdlib.h>
55: #include <string.h>
56: #include <unistd.h>
57:
58: void usage __P((void));
59: int system __P((const char *));
60:
61: int
62: main(argc, argv)
63: int argc;
64: char *argv[];
65: {
66: int ch, clen, debug, i, l, magic, n, nargs, rval;
67: char *c, *cmd, *p, *q;
68:
69: debug = 0;
70: magic = '%'; /* Default magic char is `%'. */
71: nargs = -1;
72: while ((ch = getopt(argc, argv, "a:d0123456789")) != EOF)
73: switch (ch) {
74: case 'a':
75: if (optarg[1] != '\0')
76: errx(1,
77: "illegal magic character specification.");
78: magic = optarg[0];
79: break;
80: case 'd':
81: debug = 1;
82: break;
83: case '0': case '1': case '2': case '3': case '4':
84: case '5': case '6': case '7': case '8': case '9':
85: if (nargs != -1)
86: errx(1,
87: "only one -# argument may be specified.");
88: nargs = optopt - '0';
89: break;
90: default:
91: usage();
92: }
93: argc -= optind;
94: argv += optind;
95:
96: if (argc < 2)
97: usage();
98:
99: /*
100: * The command to run is argv[0], and the args are argv[1..].
101: * Look for %digit references in the command, remembering the
102: * largest one.
103: */
104: for (n = 0, p = argv[0]; *p != '\0'; ++p)
105: if (p[0] == magic && isdigit(p[1]) && p[1] != '0') {
106: ++p;
107: if (p[0] - '0' > n)
108: n = p[0] - '0';
109: }
110:
111: /*
112: * If there were any %digit references, then use those, otherwise
113: * build a new command string with sufficient %digit references at
114: * the end to consume (nargs) arguments each time round the loop.
115: * Allocate enough space to hold the maximum command.
116: */
117: if ((cmd = malloc(sizeof("exec ") - 1 +
118: strlen(argv[0]) + 9 * (sizeof(" %1") - 1) + 1)) == NULL)
119: err(1, NULL);
120:
121: if (n == 0) {
122: /* If nargs not set, default to a single argument. */
123: if (nargs == -1)
124: nargs = 1;
125:
126: p = cmd;
127: p += sprintf(cmd, "exec %s", argv[0]);
128: for (i = 1; i <= nargs; i++)
129: p += sprintf(p, " %c%d", magic, i);
130:
131: /*
132: * If nargs set to the special value 0, eat a single
133: * argument for each command execution.
134: */
135: if (nargs == 0)
136: nargs = 1;
137: } else {
138: (void)sprintf(cmd, "exec %s", argv[0]);
139: nargs = n;
140: }
141:
142: /*
143: * Grab some space in which to build the command. Allocate
144: * as necessary later, but no reason to build it up slowly
145: * for the normal case.
146: */
147: if ((c = malloc(clen = 1024)) == NULL)
148: err(1, NULL);
149:
150: /*
151: * (argc) and (argv) are still offset by one to make it simpler to
152: * expand %digit references. At the end of the loop check for (argc)
153: * equals 1 means that all the (argv) has been consumed.
154: */
155: for (rval = 0; argc > nargs; argc -= nargs, argv += nargs) {
156: /*
157: * Find a max value for the command length, and ensure
158: * there's enough space to build it.
159: */
160: for (l = strlen(cmd), i = 0; i < nargs; i++)
161: l += strlen(argv[i]);
162: if (l > clen && (c = realloc(c, clen = l)) == NULL)
163: err(1, NULL);
164:
165: /* Expand command argv references. */
166: for (p = cmd, q = c; *p != '\0'; ++p)
167: if (p[0] == magic && isdigit(p[1]) && p[1] != '0')
168: q += sprintf(q, "%s", argv[(++p)[0] - '0']);
169: else
170: *q++ = *p;
171:
172: /* Terminate the command string. */
173: *q = '\0';
174:
175: /* Run the command. */
176: if (debug)
177: (void)printf("%s\n", c);
178: else
179: if (system(c))
180: rval = 1;
181: }
182:
183: if (argc != 1)
184: errx(1, "expecting additional argument%s after \"%s\"",
185: (nargs - argc) ? "s" : "", argv[argc - 1]);
186: exit(rval);
187: }
188:
189: /*
190: * system --
191: * Private version of system(3). Use the user's SHELL environment
192: * variable as the shell to execute.
193: */
194: int
195: system(command)
196: const char *command;
197: {
198: static char *name, *shell;
199: union wait pstat;
200: pid_t pid;
201: int omask;
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));
216: switch(pid = vfork()) {
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);
226: pid = waitpid(pid, (int *)&pstat, 0);
227: (void)sigsetmask(omask);
228: (void)signal(SIGINT, intsave);
229: (void)signal(SIGQUIT, quitsave);
230: return(pid == -1 ? -1 : pstat.w_status);
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: }
![[BACK]](/icons/back.gif){kind=icon}
Return to apply.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / apply