Function cbm_json_escape

src/foundation/str_util.c:313–360

}

int cbm_json_escape(char *buf, int bufsize, const char *src) {
    if (!buf || bufsize <= 0) {
        return 0;
    }
    if (!src) {
        buf[0] = '\0';
        return 0;
    }
    int pos = 0;
    for (int i = 0; src[i] && pos < bufsize - JSON_NUL_RESERVE; i++) {
        unsigned char c = (unsigned char)src[i];
        if (c == '"' || c == '\\') {
            if (pos + JSON_ESC_LEN > bufsize - JSON_NUL_RESERVE) {
                break;
            }
            buf[pos++] = '\\';
            buf[pos++] = (char)c;
        } else if (c == '\n') {
            if (pos + JSON_ESC_LEN > bufsize - JSON_NUL_RESERVE) {
                break;
            }
            buf[pos++] = '\\';
            buf[pos++] = 'n';
        } else if (c == '\r') {
            if (pos + JSON_ESC_LEN > bufsize - JSON_NUL_RESERVE) {
                break;
            }
            buf[pos++] = '\\';
            buf[pos++] = 'r';
        } else if (c == '\t') {
            if (pos + JSON_ESC_LEN > bufsize - JSON_NUL_RESERVE) {
                break;
            }
            buf[pos++] = '\\';
            buf[pos++] = 't';
        } else if (c < JSON_CTRL_LIMIT) {
            /* Other control chars: escape as \u00XX */
            if (pos + 6 > bufsize - JSON_NUL_RESERVE) {
                break;
            }
            pos += snprintf(buf + pos, 7, "\\u%04x", c);
        } else {
            buf[pos++] = (char)c;
        }
    }
    buf[pos] = '\0';
    return pos;
}