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authorGravatar Denis Vlasenko <vda.linux@googlemail.com>2007-11-28 06:49:03 +0000
committerGravatar Denis Vlasenko <vda.linux@googlemail.com>2007-11-28 06:49:03 +0000
commit1aa7e477b1b727db77cac2d717f0fcca40587f78 (patch)
tree247171517f0e01d32a71a5e96f4bef462cc0e9c6 /libbb
parent79c6904faff1ebd4bf4b7d9cd0c20ca70f4cec75 (diff)
downloadbusybox-1aa7e477b1b727db77cac2d717f0fcca40587f78.tar.gz
busybox-1aa7e477b1b727db77cac2d717f0fcca40587f78.tar.bz2
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')
-rw-r--r--libbb/appletlib.c87
-rw-r--r--libbb/execable.c2
-rw-r--r--libbb/vfork_daemon_rexec.c22
3 files changed, 55 insertions, 56 deletions
diff --git a/libbb/appletlib.c b/libbb/appletlib.c
index 4bd60d049..dcf24f5a9 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));
}
diff --git a/libbb/execable.c b/libbb/execable.c
index f679108be..2649a6cfe 100644
--- a/libbb/execable.c
+++ b/libbb/execable.c
@@ -65,7 +65,7 @@ int exists_execable(const char *filename)
*/
int bb_execvp(const char *file, char *const argv[])
{
- return execvp(find_applet_by_name(file) ? bb_busybox_exec_path : file,
+ return execvp(find_applet_by_name(file) >= 0 ? bb_busybox_exec_path : file,
argv);
}
#endif
diff --git a/libbb/vfork_daemon_rexec.c b/libbb/vfork_daemon_rexec.c
index a01065d69..1d6817ee6 100644
--- a/libbb/vfork_daemon_rexec.c
+++ b/libbb/vfork_daemon_rexec.c
@@ -16,7 +16,7 @@
*/
#include <paths.h>
-#include "busybox.h" /* for struct bb_applet */
+#include "busybox.h" /* uses applet tables */
/* This does a fork/exec in one call, using vfork(). Returns PID of new child,
* -1 for failure. Runs argv[0], searching path if that has no / in it. */
@@ -120,11 +120,11 @@ void restore_nofork_data(struct nofork_save_area *save)
die_sleep = save->die_sleep;
}
-int run_nofork_applet_prime(struct nofork_save_area *old, const struct bb_applet *a, char **argv)
+int run_nofork_applet_prime(struct nofork_save_area *old, int applet_no, char **argv)
{
int rc, argc;
- applet_name = a->name;
+ applet_name = APPLET_NAME(applet_no);
xfunc_error_retval = EXIT_FAILURE;
/*option_mask32 = 0; - not needed */
/* special flag for xfunc_die(). If xfunc will "die"
@@ -143,7 +143,7 @@ int run_nofork_applet_prime(struct nofork_save_area *old, const struct bb_applet
char *tmp_argv[argc+1];
memcpy(tmp_argv, argv, (argc+1) * sizeof(tmp_argv[0]));
/* Finally we can call NOFORK applet's main() */
- rc = a->main(argc, tmp_argv);
+ rc = applet_mains[applet_no](argc, tmp_argv);
} else { /* xfunc died in NOFORK applet */
/* in case they meant to return 0... */
if (rc == -2222)
@@ -155,13 +155,13 @@ int run_nofork_applet_prime(struct nofork_save_area *old, const struct bb_applet
return rc;
}
-int run_nofork_applet(const struct bb_applet *a, char **argv)
+int run_nofork_applet(int applet_no, char **argv)
{
struct nofork_save_area old;
/* Saving globals */
save_nofork_data(&old);
- return run_nofork_applet_prime(&old, a, argv);
+ return run_nofork_applet_prime(&old, applet_no, argv);
}
#endif /* FEATURE_PREFER_APPLETS */
@@ -169,15 +169,15 @@ int spawn_and_wait(char **argv)
{
int rc;
#if ENABLE_FEATURE_PREFER_APPLETS
- const struct bb_applet *a = find_applet_by_name(argv[0]);
+ int a = find_applet_by_name(argv[0]);
- if (a && (a->nofork
+ if (a >= 0 && (APPLET_IS_NOFORK(a)
#if BB_MMU
- || a->noexec /* NOEXEC trick needs fork() */
+ || APPLET_IS_NOEXEC(a) /* NOEXEC trick needs fork() */
#endif
)) {
#if BB_MMU
- if (a->nofork)
+ if (APPLET_IS_NOFORK(a))
#endif
{
return run_nofork_applet(a, argv);
@@ -190,7 +190,7 @@ int spawn_and_wait(char **argv)
return wait4pid(rc);
/* child */
xfunc_error_retval = EXIT_FAILURE;
- run_appletstruct_and_exit(a, argv);
+ run_applet_no_and_exit(a, argv);
#endif
}
#endif /* FEATURE_PREFER_APPLETS */