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hush: implement type

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Implement support for the POSIX `type` command.  Only POSIX stuff is
supported here, no bash extensions like -p or -P.

In the process, split the $PATH searching code out of builtin_source() and
into its own find_in_path() function so we don't duplicate it.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Mike Frysinger 2009-05-27 17:06:25 -04:00
parent 673e945052
commit 93cadc2fdd
1 changed files with 78 additions and 27 deletions
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103
shell/hush.c
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@ -539,6 +539,7 @@ static int builtin_shift(char **argv);
static int builtin_source(char **argv);
static int builtin_test(char **argv);
static int builtin_trap(char **argv);
static int builtin_type(char **argv);
static int builtin_true(char **argv);
static int builtin_umask(char **argv);
static int builtin_unset(char **argv);
@ -610,6 +611,7 @@ static const struct built_in_command bltins[] = {
BLTIN("shift" , builtin_shift , "Shift positional parameters"),
BLTIN("test" , builtin_test , "Test condition"),
BLTIN("trap" , builtin_trap , "Trap signals"),
BLTIN("type" , builtin_type , "Write a description of command type"),
// BLTIN("ulimit" , builtin_return , "Control resource limits"),
BLTIN("umask" , builtin_umask , "Set file creation mask"),
BLTIN("unset" , builtin_unset , "Unset environment variable"),
@ -2865,6 +2867,39 @@ static struct pipe *parse_stream(char **pstring,
static void parse_and_run_string(const char *s);
static char *find_in_path(const char *arg)
{
char *ret = NULL;
const char *PATH = get_local_var_value("PATH");
if (!PATH)
return NULL;
while (1) {
const char *end = strchrnul(PATH, ':');
int sz = end - PATH; /* must be int! */
free(ret);
if (sz != 0) {
ret = xasprintf("%.*s/%s", sz, PATH, arg);
} else {
/* We have xxx::yyyy in $PATH,
* it means "use current dir" */
ret = xstrdup(arg);
}
if (access(ret, F_OK) == 0)
break;
if (*end == '\0') {
free(ret);
return NULL;
}
PATH = end + 1;
}
return ret;
}
static const struct built_in_command* find_builtin(const char *name)
{
const struct built_in_command *x;
@ -6728,6 +6763,43 @@ static int builtin_trap(char **argv)
goto process_sig_list;
}
/* http://www.opengroup.org/onlinepubs/9699919799/utilities/type.html */
static int builtin_type(char **argv)
{
int i, ret = EXIT_SUCCESS;
for (i = 1; argv[i]; ++i) {
void *path;
const void *find_ret;
const char *type;
type = path = NULL;
if (0) {} /* make conditional compile easier below */
/*else if ((find_ret = find_alias(argv[i])))
type = "an alias";*/
#if ENABLE_HUSH_FUNCTIONS
else if ((find_ret = find_function(argv[i])))
type = "a function";
#endif
else if ((find_ret = find_builtin(argv[i])))
type = "a shell builtin";
else if ((find_ret = path = find_in_path(argv[i])))
type = find_ret;
if (!type) {
bb_error_msg("type: %s: not found", argv[i]);
ret = EXIT_FAILURE;
} else
printf("%s is %s\n", argv[i], type);
if (path)
free(path);
}
return ret;
}
#if ENABLE_HUSH_JOB
/* built-in 'fg' and 'bg' handler */
static int builtin_fg_bg(char **argv)
@ -6986,7 +7058,7 @@ static int builtin_shift(char **argv)
static int builtin_source(char **argv)
{
const char *PATH;
char *arg_path;
FILE *input;
save_arg_t sv;
#if ENABLE_HUSH_FUNCTIONS
@ -6996,36 +7068,15 @@ static int builtin_source(char **argv)
if (*++argv == NULL)
return EXIT_FAILURE;
if (strchr(*argv, '/') == NULL
&& (PATH = get_local_var_value("PATH")) != NULL
) {
/* Search through $PATH */
while (1) {
const char *end = strchrnul(PATH, ':');
int sz = end - PATH; /* must be int! */
if (sz != 0) {
char *tmp = xasprintf("%.*s/%s", sz, PATH, *argv);
input = fopen_for_read(tmp);
free(tmp);
} else {
/* We have xxx::yyyy in $PATH,
* it means "use current dir" */
input = fopen_for_read(*argv);
}
if (input)
goto opened_ok;
if (*end == '\0')
break;
PATH = end + 1;
}
}
if (strchr(*argv, '/') == NULL && (arg_path = find_in_path(*argv)) != NULL) {
input = fopen_for_read(arg_path);
free(arg_path);
} else
input = fopen_or_warn(*argv, "r");
if (!input) {
/* bb_perror_msg("%s", *argv); - done by fopen_or_warn */
return EXIT_FAILURE;
}
opened_ok:
close_on_exec_on(fileno(input));
#if ENABLE_HUSH_FUNCTIONS