busybox/applets/applet_tables.c

/* vi: set sw=4 ts=4: */
/*
 * Applet table generator.
 * Runs on host and produces include/applet_tables.h
 *
 * Copyright (C) 2007 Denys Vlasenko <vda.linux@googlemail.com>
 *
 * Licensed under GPLv2, see file License in this tarball for details.
 */

#include <stdlib.h>
#include <string.h>
#include <stdio.h>

#include "../include/autoconf.h"
#include "../include/busybox.h"

struct bb_applet {
	const char *name;
	const char *main;
	enum bb_install_loc_t install_loc;
	enum bb_suid_t need_suid;
	/* true if instead of fork(); exec("applet"); waitpid();
	 * one can do fork(); exit(applet_main(argc,argv)); waitpid(); */
	unsigned char noexec;
	/* Even nicer */
	/* true if instead of fork(); exec("applet"); waitpid();
	 * one can simply call applet_main(argc,argv); */
	unsigned char nofork;
};

/* Define struct bb_applet applets[] */
#include "../include/applets.h"

enum { NUM_APPLETS = ARRAY_SIZE(applets) };

static int offset[NUM_APPLETS];

static int cmp_name(const void *a, const void *b)
{
	const struct bb_applet *aa = a;
	const struct bb_applet *bb = b;
	return strcmp(aa->name, bb->name);
}

int main(int argc, char **argv)
{
	int i;
	int ofs;
	unsigned MAX_APPLET_NAME_LEN = 1;

	qsort(applets, NUM_APPLETS, sizeof(applets[0]), cmp_name);

	ofs = 0;
	for (i = 0; i < NUM_APPLETS; i++) {
		offset[i] = ofs;
		ofs += strlen(applets[i].name) + 1;
	}
	/* We reuse 4 high-order bits of offset array for other purposes,
	 * so if they are indeed needed, refuse to proceed */
	if (ofs > 0xfff)
		return 1;
	if (!argv[1])
		return 1;

	i = open(argv[1], O_WRONLY | O_TRUNC | O_CREAT, 0666);
	if (i < 0)
		return 1;
	dup2(i, 1);

	/* Keep in sync with include/busybox.h! */

	printf("/* This is a generated file, don't edit */\n\n");

	printf("#define NUM_APPLETS %u\n", NUM_APPLETS);
	if (NUM_APPLETS == 1) {
		printf("#define SINGLE_APPLET_STR \"%s\"\n", applets[0].name);
		printf("#define SINGLE_APPLET_MAIN %s_main\n", applets[0].name);
	}
	printf("\n");

	printf("#ifndef SKIP_definitions\n");
	printf("const char applet_names[] ALIGN1 = \"\"\n");
	for (i = 0; i < NUM_APPLETS; i++) {
		printf("\"%s\" \"\\0\"\n", applets[i].name);
		if (MAX_APPLET_NAME_LEN < strlen(applets[i].name))
			MAX_APPLET_NAME_LEN = strlen(applets[i].name);
	}
	printf(";\n\n");

	printf("#ifndef SKIP_applet_main\n");
	printf("int (*const applet_main[])(int argc, char **argv) = {\n");
	for (i = 0; i < NUM_APPLETS; i++) {
		printf("%s_main,\n", applets[i].main);
	}
	printf("};\n");
	printf("#endif\n\n");

	printf("const uint16_t applet_nameofs[] ALIGN2 = {\n");
	for (i = 0; i < NUM_APPLETS; i++) {
		printf("0x%04x,\n",
			offset[i]
#if ENABLE_FEATURE_PREFER_APPLETS
			+ (applets[i].nofork << 12)
			+ (applets[i].noexec << 13)
#endif
#if ENABLE_FEATURE_SUID
			+ (applets[i].need_suid << 14) /* 2 bits */
#endif
		);
	}
	printf("};\n\n");

#if ENABLE_FEATURE_INSTALLER
	printf("const uint8_t applet_install_loc[] ALIGN1 = {\n");
	i = 0;
	while (i < NUM_APPLETS) {
		int v = applets[i].install_loc; /* 3 bits */
		if (++i < NUM_APPLETS)
			v |= applets[i].install_loc << 4; /* 3 bits */
		printf("0x%02x,\n", v);
		i++;
	}
	printf("};\n");
#endif
	printf("#endif /* SKIP_definitions */\n");
	printf("\n");
	printf("#define MAX_APPLET_NAME_LEN %u\n", MAX_APPLET_NAME_LEN);

	return 0;
}
1	/* vi: set sw=4 ts=4: */
2	/*
3	* Applet table generator.
4	* Runs on host and produces include/applet_tables.h
5	*
6	* Copyright (C) 2007 Denys Vlasenko <vda.linux@googlemail.com>
7	*
8	* Licensed under GPLv2, see file License in this tarball for details.
9	*/
10
11	#include <stdlib.h>
12	#include <string.h>
13	#include <stdio.h>
14
15	#include "../include/autoconf.h"
16	#include "../include/busybox.h"
17
18	struct bb_applet {
19	const char *name;
20	const char *main;
21	enum bb_install_loc_t install_loc;
22	enum bb_suid_t need_suid;
23	/* true if instead of fork(); exec("applet"); waitpid();
24	* one can do fork(); exit(applet_main(argc,argv)); waitpid(); */
25	unsigned char noexec;
26	/* Even nicer */
27	/* true if instead of fork(); exec("applet"); waitpid();
28	* one can simply call applet_main(argc,argv); */
29	unsigned char nofork;
30	};
31
32	/* Define struct bb_applet applets[] */
33	#include "../include/applets.h"
34
35	enum { NUM_APPLETS = ARRAY_SIZE(applets) };
36
37	static int offset[NUM_APPLETS];
38
39	static int cmp_name(const void a, const void b)
40	{
41	const struct bb_applet *aa = a;
42	const struct bb_applet *bb = b;
43	return strcmp(aa->name, bb->name);
44	}
45
46	int main(int argc, char **argv)
47	{
48	int i;
49	int ofs;
50	unsigned MAX_APPLET_NAME_LEN = 1;
51
52	qsort(applets, NUM_APPLETS, sizeof(applets[0]), cmp_name);
53
54	ofs = 0;
55	for (i = 0; i < NUM_APPLETS; i++) {
56	offset[i] = ofs;
57	ofs += strlen(applets[i].name) + 1;
58	}
59	/* We reuse 4 high-order bits of offset array for other purposes,
60	* so if they are indeed needed, refuse to proceed */
61	if (ofs > 0xfff)
62	return 1;
63	if (!argv[1])
64	return 1;
65
66	i = open(argv[1], O_WRONLY \| O_TRUNC \| O_CREAT, 0666);
67	if (i < 0)
68	return 1;
69	dup2(i, 1);
70
71	/* Keep in sync with include/busybox.h! */
72
73	printf("/* This is a generated file, don't edit */\n\n");
74
75	printf("#define NUM_APPLETS %u\n", NUM_APPLETS);
76	if (NUM_APPLETS == 1) {
77	printf("#define SINGLE_APPLET_STR \"%s\"\n", applets[0].name);
78	printf("#define SINGLE_APPLET_MAIN %s_main\n", applets[0].name);
79	}
80	printf("\n");
81
82	printf("#ifndef SKIP_definitions\n");
83	printf("const char applet_names[] ALIGN1 = \"\"\n");
84	for (i = 0; i < NUM_APPLETS; i++) {
85	printf("\"%s\" \"\\0\"\n", applets[i].name);
86	if (MAX_APPLET_NAME_LEN < strlen(applets[i].name))
87	MAX_APPLET_NAME_LEN = strlen(applets[i].name);
88	}
89	printf(";\n\n");
90
91	printf("#ifndef SKIP_applet_main\n");
92	printf("int (const applet_main[])(int argc, char *argv) = {\n");
93	for (i = 0; i < NUM_APPLETS; i++) {
94	printf("%s_main,\n", applets[i].main);
95	}
96	printf("};\n");
97	printf("#endif\n\n");
98
99	printf("const uint16_t applet_nameofs[] ALIGN2 = {\n");
100	for (i = 0; i < NUM_APPLETS; i++) {
101	printf("0x%04x,\n",
102	offset[i]
103	#if ENABLE_FEATURE_PREFER_APPLETS
104	+ (applets[i].nofork << 12)
105	+ (applets[i].noexec << 13)
106	#endif
107	#if ENABLE_FEATURE_SUID
108	+ (applets[i].need_suid << 14) /* 2 bits */
109	#endif
110	);
111	}
112	printf("};\n\n");
113
114	#if ENABLE_FEATURE_INSTALLER
115	printf("const uint8_t applet_install_loc[] ALIGN1 = {\n");
116	i = 0;
117	while (i < NUM_APPLETS) {
118	int v = applets[i].install_loc; /* 3 bits */
119	if (++i < NUM_APPLETS)
120	v \|= applets[i].install_loc << 4; /* 3 bits */
121	printf("0x%02x,\n", v);
122	i++;
123	}
124	printf("};\n");
125	#endif
126	printf("#endif /* SKIP_definitions */\n");
127	printf("\n");
128	printf("#define MAX_APPLET_NAME_LEN %u\n", MAX_APPLET_NAME_LEN);
129
130	return 0;
131	}