libc.obj: add system

programs/develop/ktcc/trunk/libc.obj/source/stdlib/system.c

@@ -0,0 +1,52 @@
+#include <stdlib.h>
+#include <string.h>
+#include <sys/ksys.h>
+
+static int __system_parse_command(const char* command, char** path, char** args)
+{
+    if (command == NULL || path == NULL || args == NULL) {
+        return -1;
+    }
+    const char* space = strchr(command, ' ');
+    if (space == NULL) {
+        *path = strdup(command);
+        if (*path == NULL) {
+            return -1;
+        }
+        *args = NULL;
+        return 0;
+    }
+
+    size_t path_len = space - command;
+    *path = (char*)malloc(path_len + 1);
+    if (*path == NULL) {
+        return -1;
+    }
+    strncpy(*path, command, path_len);
+    (*path)[path_len] = '\0';
+
+    size_t args_len = strlen(space) + 1;
+    *args = (char*)malloc(args_len + 1);
+    if (*args == NULL) {
+        free(*path);
+        return -1;
+    }
+    strcpy(*args, space);
+
+    return 0;
+}
+
+int system(const char* command)
+{
+    if (command == NULL || *command == '\0')
+        return 1;
+    char* cmd;
+    char* args;
+
+    int ret = _ksys_exec(cmd, args);
+
+    free(cmd);
+    free(args);
+
+    return ret;
+}