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hush: implement echo builtin

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builtin_echo                                           -      36     +36
bltins                                               384     396     +12
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(add/remove: 1/0 grow/shrink: 1/0 up/down: 48/0)               Total: 48 bytes
This commit is contained in:
Denis Vlasenko 2007-11-23 21:20:21 +00:00
parent cccdc4e01a
commit 5bc593ccb8
2 changed files with 16 additions and 0 deletions
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1
shell/Config.in
View File

@ -166,6 +166,7 @@ config HUSH
select TRUE
select FALSE
select TEST
select ECHO
help
hush is a very small shell (just 18k) and it has fairly complete
Bourne shell grammar. It even handles all the normal flow control

15
shell/hush.c
View File

@ -614,6 +614,7 @@ static void free_strings(char **strings)
/* Function prototypes for builtins */
static int builtin_cd(char **argv);
static int builtin_echo(char **argv);
static int builtin_eval(char **argv);
static int builtin_exec(char **argv);
static int builtin_exit(char **argv);
@ -652,6 +653,8 @@ struct built_in_command {
#endif
};
/* For now, echo and test are unconditionally enabled.
* Maybe make it configurable? */
static const struct built_in_command bltins[] = {
BLTIN("[" , builtin_test, "Test condition"),
BLTIN("[[" , builtin_test, "Test condition"),
@ -661,6 +664,7 @@ static const struct built_in_command bltins[] = {
// BLTIN("break" , builtin_not_written, "Exit for, while or until loop"),
BLTIN("cd" , builtin_cd, "Change working directory"),
// BLTIN("continue", builtin_not_written, "Continue for, while or until loop"),
BLTIN("echo" , builtin_echo, "Write strings to stdout"),
BLTIN("eval" , builtin_eval, "Construct and run shell command"),
BLTIN("exec" , builtin_exec, "Exec command, replacing this shell with the exec'd process"),
BLTIN("exit" , builtin_exit, "Exit from shell"),
@ -841,6 +845,17 @@ static int builtin_test(char **argv)
return test_main(argc, argv - argc);
}
/* built-in 'test' handler */
static int builtin_echo(char **argv)
{
int argc = 0;
while (*argv) {
argc++;
argv++;
}
return bb_echo(argc, argv - argc);
}
/* built-in 'eval' handler */
static int builtin_eval(char **argv)
{