shells: do not frocibly enable test, echo and kill _applets_,

just build relevant source and use xxx_main functions.
build system: add a special case when we have exactly one applet enabled
(makes "true", "false", "basename" REALLY tiny).
getopt32: do not use stdio.

function                                             old     new   delta
getopt32                                            1385    1412     +27
make_device                                         1187    1200     +13
basename_main                                        120     127      +7
tcpudpsvd_main                                      1922    1926      +4
testcmd                                                5       -      -5
echocmd                                                5       -      -5
fuser_main                                          1243    1231     -12
------------------------------------------------------------------------------
(add/remove: 0/2 grow/shrink: 4/1 up/down: 51/-22)             Total: 29 bytes
This commit is contained in:
Denis Vlasenko
2008-04-01 14:47:57 +00:00
parent 165f5b394f
commit 468aea2d88
14 changed files with 84 additions and 91 deletions

View File

@@ -30,6 +30,7 @@ lib-$(CONFIG_DOS2UNIX) += dos2unix.o
lib-$(CONFIG_DU) += du.o
lib-$(CONFIG_ECHO) += echo.o
lib-$(CONFIG_ASH) += echo.o # used by ash
lib-$(CONFIG_HUSH) += echo.o # used by hush
lib-$(CONFIG_ENV) += env.o
lib-$(CONFIG_EXPR) += expr.o
lib-$(CONFIG_EXPAND) += expand.o
@@ -72,6 +73,8 @@ lib-$(CONFIG_TAIL) += tail.o
lib-$(CONFIG_TEE) += tee.o
lib-$(CONFIG_TEST) += test.o
lib-$(CONFIG_ASH) += test.o # used by ash
lib-$(CONFIG_HUSH) += test.o # used by hush
lib-$(CONFIG_MSH) += test.o # used by msh
lib-$(CONFIG_TOUCH) += touch.o
lib-$(CONFIG_TR) += tr.o
lib-$(CONFIG_TRUE) += true.o

View File

@@ -37,15 +37,16 @@ int basename_main(int argc, char **argv)
/* It should strip slash: /abc/def/ -> def */
s = bb_get_last_path_component_strip(*++argv);
m = strlen(s);
if (*++argv) {
n = strlen(*argv);
m = strlen(s);
if ((m > n) && ((strcmp)(s+m-n, *argv) == 0)) {
s[m-n] = '\0';
m -= n;
s[m] = '\0';
}
}
puts(s);
return fflush(stdout);
/* puts(s) will do, but we can do without stdio this way: */
s[m++] = '\n';
return full_write(STDOUT_FILENO, s, m) == m;
}

View File

@@ -27,10 +27,8 @@
/* This is a NOFORK applet. Be very careful! */
/* argc is unused, but removing it precludes compiler from
* using call -> jump optimization */
/* NB: can be used by shell even if not enabled as applet */
int echo_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int echo_main(int argc ATTRIBUTE_UNUSED, char **argv)
{
const char *arg;