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);

	if (argv[2]) {
		char line_old[80];
		char line_new[80];
		FILE *fp;

		line_old[0] = 0;
		fp = fopen(argv[2], "r");
		if (fp) {
			fgets(line_old, sizeof(line_old), fp);
			fclose(fp);
		}
		sprintf(line_new, "#define NUM_APPLETS %u\n", NUM_APPLETS);
		if (strcmp(line_old, line_new) != 0) {
			fp = fopen(argv[2], "w");
			if (!fp)
				return 1;
			fputs(line_new, fp);
		}
	}

	return 0;
}
1	niro	816	/* 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	niro	984	printf("/* This is a generated file, don't edit */\n\n");
74	niro	816
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	niro	984	printf("\n");
81	niro	816
82	niro	1123	//printf("#ifndef SKIP_definitions\n");
83	niro	984	printf("const char applet_names[] ALIGN1 = \"\"\n");
84	niro	816	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	niro	984	printf(";\n\n");
90	niro	816
91	niro	984	printf("#ifndef SKIP_applet_main\n");
92			printf("int (const applet_main[])(int argc, char *argv) = {\n");
93	niro	816	for (i = 0; i < NUM_APPLETS; i++) {
94			printf("%s_main,\n", applets[i].main);
95			}
96	niro	984	printf("};\n");
97			printf("#endif\n\n");
98	niro	816
99	niro	984	printf("const uint16_t applet_nameofs[] ALIGN2 = {\n");
100	niro	816	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	niro	984	printf("};\n\n");
113	niro	816
114			#if ENABLE_FEATURE_INSTALLER
115	niro	984	printf("const uint8_t applet_install_loc[] ALIGN1 = {\n");
116	niro	816	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	niro	984	printf("};\n");
125	niro	816	#endif
126	niro	1123	//printf("#endif /* SKIP_definitions */\n");
127	niro	984	printf("\n");
128	niro	816	printf("#define MAX_APPLET_NAME_LEN %u\n", MAX_APPLET_NAME_LEN);
129
130	niro	1123	if (argv[2]) {
131			char line_old[80];
132			char line_new[80];
133			FILE *fp;
134
135			line_old[0] = 0;
136			fp = fopen(argv[2], "r");
137			if (fp) {
138			fgets(line_old, sizeof(line_old), fp);
139			fclose(fp);
140			}
141			sprintf(line_new, "#define NUM_APPLETS %u\n", NUM_APPLETS);
142			if (strcmp(line_old, line_new) != 0) {
143			fp = fopen(argv[2], "w");
144			if (!fp)
145			return 1;
146			fputs(line_new, fp);
147			}
148			}
149
150	niro	816	return 0;
151			}