Function internal_find_header

src/sip_parser.cpp:417–469

}

static const char* internal_find_header(const char* msg, const char* name, const char* shortname,
        bool content)
{
    const char *ptr = msg;
    int namelen = strlen(name);
    int shortnamelen = shortname ? strlen(shortname) : 0;

    while (1) {
        int is_short = 0;
        /* RFC3261, 7.3.1: When comparing header fields, field names
         * are always case-insensitive.  Unless otherwise stated in
         * the definition of a particular header field, field values,
         * parameter names, and parameter values are case-insensitive.
         * Tokens are always case-insensitive.  Unless specified
         * otherwise, values expressed as quoted strings are case-
         * sensitive.
         *
         * Ergo, strcasecmp, because:
         *   To:...;tag=bla == TO:...;TAG=BLA
         * But:
         *   Warning: "something" != Warning: "SoMeThInG"
         */
        if (strncasecmp(ptr, name, namelen) == 0 ||
                (shortname && (is_short = 1) &&
                    strncasecmp(ptr, shortname, shortnamelen) == 0)) {
            const char *tmp = ptr + (is_short ? strlen(shortname) : strlen(name));
            while (*tmp == ' ' || *tmp == '\t') {
                ++tmp;
            }
            if (*tmp == ':') {
                /* Found */
                if (content) {
                    /* We just want the content */
                    ptr = internal_skip_lws(tmp + 1);
                }
                break;
            }
        }

        /* Seek to next line, but not past EOH */
        ptr = strchr(ptr, '\n');
        if (!ptr || ptr[-1] != '\r' || (ptr[1] == '\r' && ptr[2] == '\n')) {
            if (ptr && ptr[-1] != '\r') {
                WARNING("Missing CR during header scan at pos %d", int(ptr - msg));
                /* continue? */
            }
            return nullptr;
        }
        ++ptr;
    }

    return ptr;
}

static const char* internal_hdrchr(const char* ptr, const char needle)
{