Function _msh_exec_search_path

components/finsh/msh.c:374–422

* search for the file named "pg_name" or "pg_name.elf" at the given directory, * and return its path. return NULL when not found. */

 * and return its path. return NULL when not found.
 */
static char *_msh_exec_search_path(const char *path, const char *pg_name)
{
    char *path_buffer = RT_NULL;
    ssize_t pg_len = strlen(pg_name);
    ssize_t base_len = 0;

    if (path)
    {
        base_len = strlen(path);
    }

    path_buffer = rt_malloc(base_len + pg_len + 6);
    if (path_buffer == RT_NULL)
    {
        return RT_NULL; /* no mem */
    }

    if (base_len > 0)
    {
        memcpy(path_buffer, path, base_len);
        path_buffer[base_len] = '/';
        path_buffer[base_len + 1] = '\0';
    }
    else
    {
        *path_buffer = '\0';
    }
    strcat(path_buffer, pg_name);

    if (_msh_lwp_cmd_exists(path_buffer))
    {
        return path_buffer;
    }

    if (strstr(path_buffer, ".elf") != NULL)
    {
        goto not_found;
    }

    strcat(path_buffer, ".elf");
    if (_msh_lwp_cmd_exists(path_buffer))
    {
        return path_buffer;
    }

not_found:
    rt_free(path_buffer);
    return RT_NULL;
}

/*
 * search for the file named "pg_name" or "pg_name.elf" at each env path,