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authorDenis Vlasenko2007-11-28 06:49:03 +0000
committerDenis Vlasenko2007-11-28 06:49:03 +0000
commit1aa7e477b1b727db77cac2d717f0fcca40587f78 (patch)
tree247171517f0e01d32a71a5e96f4bef462cc0e9c6 /libbb/appletlib.c
parent79c6904faff1ebd4bf4b7d9cd0c20ca70f4cec75 (diff)
downloadbusybox-1aa7e477b1b727db77cac2d717f0fcca40587f78.zip
busybox-1aa7e477b1b727db77cac2d717f0fcca40587f78.tar.gz
reorganize applet table. Eliminates pointers to names.
Should be a big win for libbusybox. busybox wins too: text data bss dec hex filename 776524 929 9100 786553 c0079 busybox_old 775903 929 9100 785932 bfe0c busybox_unstripped
Diffstat (limited to 'libbb/appletlib.c')
-rw-r--r--libbb/appletlib.c87
1 files changed, 43 insertions, 44 deletions
diff --git a/libbb/appletlib.c b/libbb/appletlib.c
index 4bd60d0..dcf24f5 100644
--- a/libbb/appletlib.c
+++ b/libbb/appletlib.c
@@ -33,13 +33,9 @@ static const char usage_messages[] ALIGN1 = ""
#define usage_messages 0
#endif /* SHOW_USAGE */
-/* Define struct bb_applet applets[] */
-#include "applets.h"
-#if ENABLE_FEATURE_SH_STANDALONE
-/* -1 because last entry is NULL */
-const unsigned short NUM_APPLETS = ARRAY_SIZE(applets) - 1;
-#endif
+/* Include generated applet names, pointers to <apllet>_main, etc */
+#include "applet_tables.h"
#if ENABLE_FEATURE_COMPRESS_USAGE
@@ -84,16 +80,14 @@ void bb_show_usage(void)
const char *format_string;
const char *p;
const char *usage_string = p = unpack_usage_messages();
- const struct bb_applet *ap = find_applet_by_name(applet_name);
- int i;
+ int ap = find_applet_by_name(applet_name);
- if (!ap) /* never happens, paranoia */
+ if (ap < 0) /* never happens, paranoia */
xfunc_die();
- i = ap - applets;
- while (i) {
+ while (ap) {
while (*p++) continue;
- i--;
+ ap--;
}
fprintf(stderr, "%s multi-call binary\n", bb_banner);
@@ -107,18 +101,22 @@ void bb_show_usage(void)
}
-static int applet_name_compare(const void *name, const void *vapplet)
+static int applet_name_compare(const void *name, const void *v)
{
- const struct bb_applet *applet = vapplet;
-
- return strcmp(name, applet->name);
+ int i = (const char *)v - applet_names;
+ return strcmp(name, APPLET_NAME(i));
}
-const struct bb_applet *find_applet_by_name(const char *name)
+int find_applet_by_name(const char *name)
{
+ const char *p;
/* Do a binary search to find the applet entry given the name. */
- return bsearch(name, applets, ARRAY_SIZE(applets)-1, sizeof(applets[0]),
- applet_name_compare);
+
+ /* NB: any char pointer will work as well, not necessarily applet_names */
+ p = bsearch(name, applet_names, ARRAY_SIZE(applet_mains), 1, applet_name_compare);
+ if (!p)
+ return -1;
+ return p - applet_names;
}
@@ -166,7 +164,7 @@ USE_FEATURE_SUID(static uid_t ruid;) /* real uid */
/* applets[] is const, so we have to define this "override" structure */
static struct BB_suid_config {
- const struct bb_applet *m_applet;
+ int m_applet;
uid_t m_uid;
gid_t m_gid;
mode_t m_mode;
@@ -232,7 +230,7 @@ static void parse_config_file(void)
{
struct BB_suid_config *sct_head;
struct BB_suid_config *sct;
- const struct bb_applet *applet;
+ int applet_no;
FILE *f;
const char *errmsg;
char *s;
@@ -343,14 +341,14 @@ static void parse_config_file(void)
* applet is currently built in and ignore it otherwise.
* Note: this can hide config file bugs which only pop
* up when the busybox configuration is changed. */
- applet = find_applet_by_name(s);
- if (applet) {
+ applet_no = find_applet_by_name(s);
+ if (applet_no >= 0) {
/* Note: We currently don't check for duplicates!
* The last config line for each applet will be the
* one used since we insert at the head of the list.
* I suppose this could be considered a feature. */
sct = xmalloc(sizeof(struct BB_suid_config));
- sct->m_applet = applet;
+ sct->m_applet = applet_no;
sct->m_mode = 0;
sct->m_next = sct_head;
sct_head = sct;
@@ -441,7 +439,7 @@ static inline void parse_config_file(void)
#if ENABLE_FEATURE_SUID
-static void check_suid(const struct bb_applet *applet)
+static void check_suid(int applet_no)
{
gid_t rgid; /* real gid */
@@ -456,7 +454,7 @@ static void check_suid(const struct bb_applet *applet)
mode_t m;
for (sct = suid_config; sct; sct = sct->m_next) {
- if (sct->m_applet == applet)
+ if (sct->m_applet == applet_no)
goto found;
}
goto check_need_suid;
@@ -504,12 +502,12 @@ static void check_suid(const struct bb_applet *applet)
#endif
check_need_suid:
#endif
- if (applet->need_suid == _BB_SUID_ALWAYS) {
+ if (APPLET_SUID(applet_no) == _BB_SUID_ALWAYS) {
/* Real uid is not 0. If euid isn't 0 too, suid bit
* is most probably not set on our executable */
if (geteuid())
bb_error_msg_and_die("must be suid to work properly");
- } else if (applet->need_suid == _BB_SUID_NEVER) {
+ } else if (APPLET_SUID(applet_no) == _BB_SUID_NEVER) {
xsetgid(rgid); /* drop all privileges */
xsetuid(ruid);
}
@@ -536,18 +534,19 @@ static void install_links(const char *busybox, int use_symbolic_links)
usr_sbin
};
- int (*lf)(const char *, const char *) = link;
+ int (*lf)(const char *, const char *);
char *fpc;
int i;
int rc;
+ lf = link;
if (use_symbolic_links)
lf = symlink;
- for (i = 0; applets[i].name != NULL; i++) {
+ for (i = 0; i < ARRAY_SIZE(applet_mains); i++) {
fpc = concat_path_file(
- install_dir[applets[i].install_loc],
- applets[i].name);
+ install_dir[APPLET_INSTALL_LOC(i)],
+ APPLET_NAME(i));
rc = lf(busybox, fpc);
if (rc != 0 && errno != EEXIST) {
bb_simple_perror_msg(fpc);
@@ -564,7 +563,7 @@ static int busybox_main(char **argv)
{
if (!argv[1]) {
/* Called without arguments */
- const struct bb_applet *a;
+ const char *a;
int col, output_width;
help:
output_width = 80;
@@ -588,14 +587,14 @@ static int busybox_main(char **argv)
"\twill act like whatever it was invoked as!\n"
"\nCurrently defined functions:\n");
col = 0;
- a = applets;
- while (a->name) {
+ a = applet_names;
+ while (*a) {
if (col > output_width) {
puts(",");
col = 0;
}
- col += printf("%s%s", (col ? ", " : "\t"), a->name);
- a++;
+ col += printf("%s%s", (col ? ", " : "\t"), a);
+ a += strlen(a) + 1;
}
puts("\n");
return 0;
@@ -629,7 +628,7 @@ static int busybox_main(char **argv)
bb_error_msg_and_die("applet not found");
}
-void run_appletstruct_and_exit(const struct bb_applet *applet, char **argv)
+void run_applet_no_and_exit(int applet_no, char **argv)
{
int argc = 1;
@@ -640,19 +639,19 @@ void run_appletstruct_and_exit(const struct bb_applet *applet, char **argv)
optind = 1;
xfunc_error_retval = EXIT_FAILURE;
- applet_name = applet->name;
+ applet_name = APPLET_NAME(applet_no);
if (argc == 2 && !strcmp(argv[1], "--help"))
bb_show_usage();
if (ENABLE_FEATURE_SUID)
- check_suid(applet);
- exit(applet->main(argc, argv));
+ check_suid(applet_no);
+ exit(applet_mains[applet_no](argc, argv));
}
void run_applet_and_exit(const char *name, char **argv)
{
- const struct bb_applet *applet = find_applet_by_name(name);
- if (applet)
- run_appletstruct_and_exit(applet, argv);
+ int applet = find_applet_by_name(name);
+ if (applet >= 0)
+ run_applet_no_and_exit(applet, argv);
if (!strncmp(name, "busybox", 7))
exit(busybox_main(argv));
}