Function print_string_ptr

cJSON.c:339–405

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 char *print_string_ptr(const char *str)
{
    const char *ptr;
    char *ptr2, *out;
    int len = 0;
    unsigned char token;

    if (!str)
        return cJSON_strdup("");
    ptr = str;
    while ((token = *ptr) && ++len)
    {
        if (strchr("\"\\\b\f\n\r\t", token))
            len++;
        else if (token < 32)
            len += 5;
        ptr++;
    }

    out = (char*) cJSON_malloc(len + 3);
    if (!out)
        return 0;

    ptr2 = out;
    ptr = str;
    *ptr2++ = '\"';
    while (*ptr)
    {
        if ((unsigned char) *ptr > 31 && *ptr != '\"' && *ptr != '\\')
            *ptr2++ = *ptr++;
        else
        {
            *ptr2++ = '\\';
            switch (token = *ptr++)
            {
            case '\\':
                *ptr2++ = '\\';
                break;
            case '\"':
                *ptr2++ = '\"';
                break;
            case '\b':
                *ptr2++ = 'b';
                break;
            case '\f':
                *ptr2++ = 'f';
                break;
            case '\n':
                *ptr2++ = 'n';
                break;
            case '\r':
                *ptr2++ = 'r';
                break;
            case '\t':
                *ptr2++ = 't';
                break;
            default:
                sprintf(ptr2, "u%04x", token);