ddb.c revision 178515 
1/*-
2 * Copyright (c) 2007 Robert N. M. Watson
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: head/sbin/ddb/ddb.c 178515 2008-04-25 17:34:09Z rwatson $");
29
30#include <err.h>
31#include <stdio.h>
32#include <stdlib.h>
33#include <string.h>
34#include <sysexits.h>
35#include <unistd.h>
36
37#include "ddb.h"
38
39void ddb_readfile(char *file);
40void ddb_main(int argc, char *argv[]);
41
42void
43usage(void)
44{
45
46	fprintf(stderr, "usage: ddb capture [-M core] [-N system] print\n");
47	fprintf(stderr, "       ddb capture [-M core] [-N system] status\n");
48	fprintf(stderr, "       ddb script scriptname\n");
49	fprintf(stderr, "       ddb script scriptname=script\n");
50	fprintf(stderr, "       ddb scripts\n");
51	fprintf(stderr, "       ddb unscript scriptname\n");
52	fprintf(stderr, "       ddb pathname\n");
53	exit(EX_USAGE);
54}
55
56void
57ddb_readfile(char *filename)
58{
59	char    buf[BUFSIZ];
60	FILE*	f;
61
62	if ((f = fopen(filename, "r")) == NULL)
63		err(EX_UNAVAILABLE, "fopen: %s", filename);
64
65#define WHITESP		" \t"
66#define MAXARG	 	2
67	while (fgets(buf, BUFSIZ, f)) {
68		int argc = 0;
69		char *argv[MAXARG];
70		size_t spn;
71
72		spn = strlen(buf);
73		if (buf[spn-1] == '\n')
74			buf[spn-1] = '\0';
75
76		spn = strspn(buf, WHITESP);
77		argv[0] = buf + spn;
78		if (*argv[0] == '#' || *argv[0] == '\0')
79			continue;
80		argc++;
81
82		spn = strcspn(argv[0], WHITESP);
83		argv[1] = argv[0] + spn + strspn(argv[0] + spn, WHITESP);;
84		argv[0][spn] = '\0';
85		if (*argv[1] != '\0')
86			argc++;
87
88#ifdef DEBUG
89		{
90			int i;
91			printf("argc = %d\n", argc);
92			for (i = 0; i < argc; i++) {
93				printf("arg[%d] = %s\n", i, argv[i]);
94			}
95		}
96#endif
97		ddb_main(argc, argv);
98	}
99}
100
101void
102ddb_main(int argc, char *argv[])
103{
104
105	if (argc < 1)
106		usage();
107
108	if (strcmp(argv[0], "capture") == 0)
109		ddb_capture(argc, argv);
110	else if (strcmp(argv[0], "script") == 0)
111		ddb_script(argc, argv);
112	else if (strcmp(argv[0], "scripts") == 0)
113		ddb_scripts(argc, argv);
114	else if (strcmp(argv[0], "unscript") == 0)
115		ddb_unscript(argc, argv);
116	else
117		usage();
118}
119
120int
121main(int argc, char *argv[])
122{
123
124	/*
125	 * If we've only got one argument and it's an absolute path to a file,
126	 * interpret as a file to be read in.
127	 */
128	if (argc == 2 && argv[1][0] == '/' && access(argv[1], R_OK) == 0)
129		ddb_readfile(argv[1]);
130	else
131		ddb_main(argc-1, argv+1);
132	exit(EX_OK);
133}
134