Function lwp_args_load_script

components/lwp/lwp_args.c:711–796

* @brief Load and process interpreter script for light-weight process * * @param[in,out] ai Pointer to the lwp_args_info structure to store script arguments * @param[in] filename Path to the script file to load * * @return rt_err_t Returns RT_EOK (0) on success, negative error code on failure: * - -1: General error (file open/read failure) * - Other errors from args_init() o

 *       It handles script verification, argument parsing, and proper cleanup on failure.
 */
rt_err_t lwp_args_load_script(struct lwp_args_info *ai, const char *filename)
{
    rt_err_t error = -1;
    int fd = -RT_ERROR;
    int len;
    int rf_stat;
    char interp[INTERP_BUF_SIZE];
    char *cp, *nextword;
    char script_magic[2];
    struct lwp_args_info ow_ai = {0};

    fd = open(filename, O_BINARY | O_RDONLY, 0);
    if (fd < 0)
    {
        goto quit;
    }

    /**
     * verify an interpreter script by matching script file magic
     * eg: #!/bin/sh
     */
    len = read(fd, script_magic, sizeof(script_magic));
    if (len != 2 || memcmp(script_magic, "#!", sizeof(script_magic)))
    {
        goto quit;
    }

    /* setup a new args struct to save script arguments */
    if (args_init(&ow_ai, INTERP_BUF_SIZE))
    {
        goto quit;
    }

    while (1)
    {
        /* read file to buffer (avoid any truncated words in buffer) */
        rf_stat = _readfile(fd, INTERP_BUF_SIZE, interp, &len);
        if (len <= 0)
        {
            goto quit;
        }

        /* find first word until reaching nil */
        cp = _find_word(interp);
        if (*cp == '\0')
        {
            if (READFILE_STAT_CAN_READMORE(rf_stat))
                continue;
            else
                break;
        }

        do
        {
            nextword = _seperate_and_get_nextword(cp);
            args_append(&ow_ai, cp, strlen(cp), LWP_ARGS_TYPE_KARG);
            cp = nextword;
        }