Function print_string_ptr

lib/cJSON.c:715–858

Render the cstring provided to an escaped version that can be printed. */

/* Render the cstring provided to an escaped version that can be printed. */
static unsigned char *print_string_ptr(const unsigned char *str, printbuffer *p)
{
    const unsigned char *ptr = NULL;
    unsigned char *ptr2 = NULL;
    unsigned char *out = NULL;
    size_t len = 0;
    cjbool flag = false;
    unsigned char token = '\0';

    /* empty string */
    if (!str)
    {
        if (p)
        {
            out = ensure(p, 3);
        }
        else
        {
            out = (unsigned char*)cJSON_malloc(3);
        }
        if (!out)
        {
            return NULL;
        }
        strcpy((char*)out, "\"\"");

        return out;
    }

    /* set "flag" to 1 if something needs to be escaped */
    for (ptr = str; *ptr; ptr++)
    {
        flag |= (((*ptr > 0) && (*ptr < 32)) /* unprintable characters */
                || (*ptr == '\"') /* double quote */
                || (*ptr == '\\')) /* backslash */
            ? 1
            : 0;
    }
    /* no characters have to be escaped */
    if (!flag)
    {
        len = (size_t)(ptr - str);
        if (p)
        {
            out = ensure(p, len + 3);
        }
        else
        {
            out = (unsigned char*)cJSON_malloc(len + 3);
        }
        if (!out)
        {
            return NULL;
        }

        ptr2 = out;
        *ptr2++ = '\"';
        strcpy((char*)ptr2, (const char*)str);