ddb.c revision 330449 
1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2007 Robert N. M. Watson
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30__FBSDID("$FreeBSD: stable/11/sbin/ddb/ddb.c 330449 2018-03-05 07:26:05Z eadler $");
31
32#include <err.h>
33#include <stdio.h>
34#include <stdlib.h>
35#include <string.h>
36#include <sysexits.h>
37#include <unistd.h>
38
39#include "ddb.h"
40
41void ddb_readfile(char *file);
42void ddb_main(int argc, char *argv[]);
43
44void
45usage(void)
46{
47
48	fprintf(stderr, "usage: ddb capture [-M core] [-N system] print\n");
49	fprintf(stderr, "       ddb capture [-M core] [-N system] status\n");
50	fprintf(stderr, "       ddb script scriptname\n");
51	fprintf(stderr, "       ddb script scriptname=script\n");
52	fprintf(stderr, "       ddb scripts\n");
53	fprintf(stderr, "       ddb unscript scriptname\n");
54	fprintf(stderr, "       ddb pathname\n");
55	exit(EX_USAGE);
56}
57
58void
59ddb_readfile(char *filename)
60{
61	char    buf[BUFSIZ];
62	FILE*	f;
63
64	if ((f = fopen(filename, "r")) == NULL)
65		err(EX_UNAVAILABLE, "fopen: %s", filename);
66
67#define WHITESP		" \t"
68#define MAXARG	 	2
69	while (fgets(buf, BUFSIZ, f)) {
70		int argc = 0;
71		char *argv[MAXARG];
72		size_t spn;
73
74		spn = strlen(buf);
75		if (buf[spn-1] == '\n')
76			buf[spn-1] = '\0';
77
78		spn = strspn(buf, WHITESP);
79		argv[0] = buf + spn;
80		if (*argv[0] == '#' || *argv[0] == '\0')
81			continue;
82		argc++;
83
84		spn = strcspn(argv[0], WHITESP);
85		argv[1] = argv[0] + spn + strspn(argv[0] + spn, WHITESP);
86		argv[0][spn] = '\0';
87		if (*argv[1] != '\0')
88			argc++;
89
90#ifdef DEBUG
91		{
92			int i;
93			printf("argc = %d\n", argc);
94			for (i = 0; i < argc; i++) {
95				printf("arg[%d] = %s\n", i, argv[i]);
96			}
97		}
98#endif
99		ddb_main(argc, argv);
100	}
101	fclose(f);
102}
103
104void
105ddb_main(int argc, char *argv[])
106{
107
108	if (argc < 1)
109		usage();
110
111	if (strcmp(argv[0], "capture") == 0)
112		ddb_capture(argc, argv);
113	else if (strcmp(argv[0], "script") == 0)
114		ddb_script(argc, argv);
115	else if (strcmp(argv[0], "scripts") == 0)
116		ddb_scripts(argc, argv);
117	else if (strcmp(argv[0], "unscript") == 0)
118		ddb_unscript(argc, argv);
119	else
120		usage();
121}
122
123int
124main(int argc, char *argv[])
125{
126
127	/*
128	 * If we've only got one argument and it's an absolute path to a file,
129	 * interpret as a file to be read in.
130	 */
131	if (argc == 2 && argv[1][0] == '/' && access(argv[1], R_OK) == 0)
132		ddb_readfile(argv[1]);
133	else
134		ddb_main(argc-1, argv+1);
135	exit(EX_OK);
136}
137