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ash: optional printf builtin. +25 bytes if off, +35 if on.

Browse Source 
by Cristian Ionescu-Idbohrn.
This commit is contained in:
Denis Vlasenko 2008-06-01 22:36:39 +00:00
parent d78920675f
commit cd2663f15e
9 changed files with 45 additions and 13 deletions
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1
coreutils/Kbuild
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@ -54,6 +54,7 @@ lib-$(CONFIG_NOHUP) += nohup.o
lib-$(CONFIG_OD) += od.o
lib-$(CONFIG_PRINTENV) += printenv.o
lib-$(CONFIG_PRINTF) += printf.o
lib-$(CONFIG_ASH_BUILTIN_PRINTF) += printf.o
lib-$(CONFIG_PWD) += pwd.o
lib-$(CONFIG_READLINK) += readlink.o
lib-$(CONFIG_REALPATH) += realpath.o

1
coreutils/chown.c
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@ -61,7 +61,6 @@ static int fileAction(const char *fileName, struct stat *statbuf,
return FALSE;
}
int chown_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int chown_main(int argc ATTRIBUTE_UNUSED, char **argv)
{
int retval = EXIT_SUCCESS;

18
coreutils/printf.c
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@ -193,6 +193,7 @@ static char **print_formatted(char *f, char **argv)
unsigned direc_length; /* Length of % directive. */
int field_width; /* Arg to first '*', or -1 if none. */
int precision; /* Arg to second '*', or -1 if none. */
char **saved_argv = argv;
for (; *f; ++f) {
switch (*f) {
@ -264,8 +265,9 @@ static char **print_formatted(char *f, char **argv)
precision, "");
break;
case '\\':
if (*++f == 'c')
exit(EXIT_SUCCESS);
if (*++f == 'c') {
return saved_argv; /* causes main() to exit */
}
bb_putchar(bb_process_escape_sequence((const char **)&f));
f--;
break;
@ -277,12 +279,22 @@ static char **print_formatted(char *f, char **argv)
return argv;
}
int printf_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int printf_main(int argc ATTRIBUTE_UNUSED, char **argv)
{
char *format;
char **argv2;
/* We must check that stdout is not closed.
* The reason for this is highly non-obvious. printf_main is used from shell.
* Shell must correctly handle 'printf "%s" foo'
* if stdout is closed. With stdio, output gets shoveled into
* stdout buffer, and even fflush cannot clear it out. It seems that
* even if libc receives EBADF on write attempts, it feels determined
* to output data no matter what. So it will try later,
* and possibly will clobber future output. Not good. */
if (dup2(1, 1) != 1)
return -1;
/* bash builtin errors out on "printf '-%s-\n' foo",
* coreutils-6.9 works. Both work with "printf -- '-%s-\n' foo".
* We will mimic coreutils. */

2
include/applets.h
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@ -275,7 +275,7 @@ USE_PIVOT_ROOT(APPLET(pivot_root, _BB_DIR_SBIN, _BB_SUID_NEVER))
USE_PKILL(APPLET_ODDNAME(pkill, pgrep, _BB_DIR_USR_BIN, _BB_SUID_NEVER, pkill))
USE_HALT(APPLET_ODDNAME(poweroff, halt, _BB_DIR_SBIN, _BB_SUID_NEVER, poweroff))
USE_PRINTENV(APPLET(printenv, _BB_DIR_BIN, _BB_SUID_NEVER))
USE_PRINTF(APPLET(printf, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
USE_PRINTF(APPLET_NOFORK(printf, printf, _BB_DIR_USR_BIN, _BB_SUID_NEVER, printf))
USE_PS(APPLET(ps, _BB_DIR_BIN, _BB_SUID_NEVER))
USE_PSCAN(APPLET(pscan, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
USE_PWD(APPLET_NOFORK(pwd, pwd, _BB_DIR_BIN, _BB_SUID_NEVER, pwd))

9
include/libbb.h
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@ -878,13 +878,16 @@ extern void bb_verror_msg(const char *s, va_list p, const char *strerr);
#endif
/* applets which are useful from another applets */
/* Applets which are useful from another applets */
int bb_cat(char** argv);
/* If shell needs them, these three "exist" even if not enabled as applets */
/* If shell needs them, they exist even if not enabled as applets */
int echo_main(int argc, char** argv) USE_ECHO(MAIN_EXTERNALLY_VISIBLE);
int printf_main(int argc, char **argv) USE_PRINTF(MAIN_EXTERNALLY_VISIBLE);
int test_main(int argc, char **argv) USE_TEST(MAIN_EXTERNALLY_VISIBLE);
int kill_main(int argc, char **argv) USE_KILL(MAIN_EXTERNALLY_VISIBLE);
int chown_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
/* Similar, but used by chgrp, not shell */
int chown_main(int argc, char **argv) USE_CHOWN(MAIN_EXTERNALLY_VISIBLE);
/* Don't need USE_xxx() guard for these */
int gunzip_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int bunzip2_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int bbunpack(char **argv,

3
miscutils/last.c
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@ -10,6 +10,9 @@
#include "libbb.h"
#include <utmp.h>
/* NB: ut_name and ut_user are the same field, use only one name (ut_user)
* to reduce confusion */
#ifndef SHUTDOWN_TIME
# define SHUTDOWN_TIME 254
#endif

3
miscutils/last_fancy.c
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@ -10,6 +10,9 @@
#include "libbb.h"
#include <utmp.h>
/* NB: ut_name and ut_user are the same field, use only one name (ut_user)
* to reduce confusion */
#ifndef SHUTDOWN_TIME
# define SHUTDOWN_TIME 254
#endif

7
shell/Config.in
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@ -114,6 +114,13 @@ config ASH_BUILTIN_ECHO
help
Enable support for echo, builtin to ash.
config ASH_BUILTIN_PRINTF
bool "Builtin version of 'printf'"
default y
depends on ASH
help
Enable support for printf, builtin to ash.
config ASH_BUILTIN_TEST
bool "Builtin version of 'test'"
default y

6
shell/ash.c
View File

@ -8488,8 +8488,9 @@ static int ulimitcmd(int, char **);
* Apart from the above, [[ expr ]] should work as [ expr ]
*/
#define testcmd test_main
#define echocmd echo_main
#define printfcmd printf_main
#define testcmd test_main
/* Keep these in proper order since it is searched via bsearch() */
static const struct builtincmd builtintab[] = {
@ -8540,6 +8541,9 @@ static const struct builtincmd builtintab[] = {
{ BUILTIN_NOSPEC "let", letcmd },
#endif
{ BUILTIN_ASSIGN "local", localcmd },
#if ENABLE_ASH_BUILTIN_PRINTF
{ BUILTIN_REGULAR "printf", printfcmd },
#endif
{ BUILTIN_NOSPEC "pwd", pwdcmd },
{ BUILTIN_REGULAR "read", readcmd },
{ BUILTIN_SPEC_REG_ASSG "readonly", exportcmd },