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/* 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 source tree.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>
#undef ARRAY_SIZE
#define ARRAY_SIZE(x) ((unsigned)(sizeof(x) / sizeof((x)[0])))
#include "../include/autoconf.h"
#include "../include/applet_metadata.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) {
char *dash_to_underscore, *p;
printf("#define SINGLE_APPLET_STR \"%s\"\n", applets[0].name);
/* Example: "ether-wake" -> "ether_wake" */
p = dash_to_underscore = strdup(applets[0].name);
p--;
while (*++p)
if (*p == '-')
*p = '_';
printf("#define SINGLE_APPLET_MAIN %s_main\n", dash_to_underscore);
}
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;
}
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