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Add "system"

This commit is contained in:
Přemysl Eric Janouch 2017-05-21 10:03:29 +02:00
parent c7b06a490f
commit 16a4c3b21a
Signed by: p
GPG Key ID: B715679E3A361BE6
1 changed files with 28 additions and 1 deletions
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ell.c
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@ -888,6 +888,23 @@ execute (struct context *ctx, struct item *body, struct item **result) {
#define defn(name) static bool name \
(struct context *ctx, struct item *args, struct item **result)
static struct item *new_format (const char *fmt, ...) ATTRIBUTE_PRINTF (1, 2);
static struct item *
new_format (const char *fmt, ...) {
va_list ap;
va_start (ap, fmt);
char *s = vformat (fmt, ap);
va_end (ap);
if (!s)
return NULL;
struct item *item = new_string (s, strlen (s));
free (s);
return item;
}
#define E_BREAK "_break"
static bool
@ -1067,6 +1084,15 @@ defn (fn_concatenate) {
return ok;
}
defn (fn_system) {
struct item *command = args;
if (!command || command->type != ITEM_STRING)
return set_error (ctx, "first argument must be string");
if (command->next)
return set_error (ctx, "cannot deal with multiple arguments");
return check (ctx, (*result = new_format ("%d", system (command->value))));
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static bool
@ -1109,7 +1135,8 @@ init_runtime_library (struct context *ctx) {
&& native_register (ctx, "map", fn_map)
&& native_register (ctx, "filter", fn_filter)
&& native_register (ctx, "print", fn_print)
&& native_register (ctx, "..", fn_concatenate);
&& native_register (ctx, "..", fn_concatenate)
&& native_register (ctx, "system", fn_system);
}
// --- Main --------------------------------------------------------------------