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better shared strings trick

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text	   data	    bss	    dec	    hex	filename
 861980	    441	   7540	 869961	  d4649	busybox_old
 861914	    441	   7540	 869895	  d4607	busybox_unstripped

Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
This commit is contained in:
Denys Vlasenko 2010-09-01 12:01:17 +02:00
parent 9dc04124d5
commit 0004e99493
8 changed files with 33 additions and 43 deletions
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35
include/libbb.h
View File

@ -1573,12 +1573,22 @@ void bb_progress_update(bb_progress_t *p, const char *curfile,
off_t totalsize) FAST_FUNC;
extern const char *applet_name;
/* Some older linkers don't perform string merging, we used to have common strings
* as global arrays to do it by hand. But:
* (1) newer linkers do it themselves,
* (2) however, they DONT merge string constants with global arrays,
* even if the value is the same (!). Thus global arrays actually
* increased size a bit: for example, "/etc/passwd" string from libc
* wasn't merged with bb_path_passwd_file[] array!
* Therefore now we use #defines.
*/
/* "BusyBox vN.N.N (timestamp or extra_version)" */
extern const char bb_banner[];
extern const char bb_msg_memory_exhausted[];
extern const char bb_msg_invalid_date[];
extern const char bb_msg_read_error[];
extern const char bb_msg_write_error[];
#define bb_msg_read_error "read error"
#define bb_msg_write_error "write error"
extern const char bb_msg_unknown[];
extern const char bb_msg_can_not_create_raw_socket[];
extern const char bb_msg_perm_denied_are_you_root[];
@ -1588,18 +1598,23 @@ extern const char bb_msg_invalid_arg[];
extern const char bb_msg_standard_input[];
extern const char bb_msg_standard_output[];
extern const char bb_str_default[];
/* NB: (bb_hexdigits_upcase[i] | 0x20) -> lowercase hex digit */
extern const char bb_hexdigits_upcase[];
extern const char bb_path_mtab_file[];
extern const char bb_path_passwd_file[];
extern const char bb_path_shadow_file[];
extern const char bb_path_gshadow_file[];
extern const char bb_path_group_file[];
extern const char bb_path_motd_file[];
extern const char bb_path_wtmp_file[];
extern const char bb_dev_null[];
/* Busybox mount uses either /proc/mounts or /etc/mtab to
* get the list of currently mounted filesystems */
#define bb_path_mtab_file IF_FEATURE_MTAB_SUPPORT("/etc/mtab")IF_NOT_FEATURE_MTAB_SUPPORT("/proc/mounts")
#define bb_path_passwd_file "/etc/passwd"
#define bb_path_shadow_file "/etc/shadow"
#define bb_path_gshadow_file "/etc/gshadow"
#define bb_path_group_file "/etc/group"
#define bb_path_motd_file "/etc/motd"
#define bb_dev_null "/dev/null"
extern const char bb_busybox_exec_path[];
/* util-linux manpage says /sbin:/bin:/usr/sbin:/usr/bin,
* but I want to save a few bytes here */

1
libbb/Kbuild.src
View File

@ -64,7 +64,6 @@ lib-y += md5.o
#lib-y += md5prime.o
lib-y += messages.o
lib-y += mode_string.o
lib-y += mtab_file.o
lib-y += obscure.o
lib-y += parse_mode.o
lib-y += parse_config.o

6
libbb/inet_common.c
View File

@ -23,7 +23,7 @@ int FAST_FUNC INET_resolve(const char *name, struct sockaddr_in *s_in, int hostf
s_in->sin_port = 0;
/* Default is special, meaning 0.0.0.0. */
if (!strcmp(name, bb_str_default)) {
if (strcmp(name, "default") == 0) {
s_in->sin_addr.s_addr = INADDR_ANY;
return 1;
}
@ -109,7 +109,7 @@ char* FAST_FUNC INET_rresolve(struct sockaddr_in *s_in, int numeric, uint32_t ne
if (ad == INADDR_ANY) {
if ((numeric & 0x0FFF) == 0) {
if (numeric & 0x8000)
return xstrdup(bb_str_default);
return xstrdup("default");
return xstrdup("*");
}
}
@ -205,7 +205,7 @@ char* FAST_FUNC INET6_rresolve(struct sockaddr_in6 *sin6, int numeric)
}
if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
if (numeric & 0x8000)
return xstrdup(bb_str_default);
return xstrdup("default");
return xstrdup("*");
}

9
libbb/messages.c
View File

@ -24,8 +24,6 @@ const char bb_banner[] ALIGN1 = BANNER;
const char bb_msg_memory_exhausted[] ALIGN1 = "memory exhausted";
const char bb_msg_invalid_date[] ALIGN1 = "invalid date '%s'";
const char bb_msg_write_error[] ALIGN1 = "write error";
const char bb_msg_read_error[] ALIGN1 = "read error";
const char bb_msg_unknown[] ALIGN1 = "(unknown)";
const char bb_msg_can_not_create_raw_socket[] ALIGN1 = "can't create raw socket";
const char bb_msg_perm_denied_are_you_root[] ALIGN1 = "permission denied (are you root?)";
@ -35,15 +33,8 @@ const char bb_msg_invalid_arg[] ALIGN1 = "invalid argument '%s' to '%s'";
const char bb_msg_standard_input[] ALIGN1 = "standard input";
const char bb_msg_standard_output[] ALIGN1 = "standard output";
const char bb_str_default[] ALIGN1 = "default";
const char bb_hexdigits_upcase[] ALIGN1 = "0123456789ABCDEF";
const char bb_path_passwd_file[] ALIGN1 = "/etc/passwd";
const char bb_path_shadow_file[] ALIGN1 = "/etc/shadow";
const char bb_path_group_file[] ALIGN1 = "/etc/group";
const char bb_path_gshadow_file[] ALIGN1 = "/etc/gshadow";
const char bb_path_motd_file[] ALIGN1 = "/etc/motd";
const char bb_dev_null[] ALIGN1 = "/dev/null";
const char bb_busybox_exec_path[] ALIGN1 = CONFIG_BUSYBOX_EXEC_PATH;
const char bb_default_login_shell[] ALIGN1 = LIBBB_DEFAULT_LOGIN_SHELL;
/* util-linux manpage says /sbin:/bin:/usr/sbin:/usr/bin,

15
libbb/mtab_file.c
View File

@ -1,15 +0,0 @@
/* vi: set sw=4 ts=4: */
/*
* Utility routines.
*
* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
#include "libbb.h"
/* Busybox mount uses either /proc/mounts or /etc/mtab to
* get the list of currently mounted filesystems */
const char bb_path_mtab_file[] ALIGN1 =
IF_FEATURE_MTAB_SUPPORT("/etc/mtab")IF_NOT_FEATURE_MTAB_SUPPORT("/proc/mounts");

2
networking/ifconfig.c
View File

@ -370,7 +370,7 @@ int ifconfig_main(int argc UNUSED_PARAM, char **argv)
#endif
sai.sin_family = AF_INET;
sai.sin_port = 0;
if (!strcmp(host, bb_str_default)) {
if (strcmp(host, "default") == 0) {
/* Default is special, meaning 0.0.0.0. */
sai.sin_addr.s_addr = INADDR_ANY;
}

4
networking/libiproute/utils.c
View File

@ -64,7 +64,7 @@ int get_addr_1(inet_prefix *addr, char *name, int family)
{
memset(addr, 0, sizeof(*addr));
if (strcmp(name, bb_str_default) == 0
if (strcmp(name, "default") == 0
|| strcmp(name, "all") == 0
|| strcmp(name, "any") == 0
) {
@ -103,7 +103,7 @@ static int get_prefix_1(inet_prefix *dst, char *arg, int family)
memset(dst, 0, sizeof(*dst));
if (strcmp(arg, bb_str_default) == 0
if (strcmp(arg, "default") == 0
|| strcmp(arg, "all") == 0
|| strcmp(arg, "any") == 0
) {

4
networking/route.c
View File

@ -185,7 +185,7 @@ static NOINLINE void INET_setroute(int action, char **args)
#endif
} else {
/* Default netmask. */
netmask = bb_str_default;
netmask = "default";
}
/* Prefer hostname lookup is -host flag (xflag==1) was given. */
isnet = INET_resolve(target, (struct sockaddr_in *) &rt.rt_dst,
@ -346,7 +346,7 @@ static NOINLINE void INET6_setroute(int action, char **args)
/* We know args isn't NULL from the check in route_main. */
const char *target = *args++;
if (strcmp(target, bb_str_default) == 0) {
if (strcmp(target, "default") == 0) {
prefix_len = 0;
memset(&sa6, 0, sizeof(sa6));
} else {