/* $Id: capiutil.c,v 1.13.6.4 2001/09/23 22:24:33 kai Exp $
 *
 * CAPI 2.0 convert capi message to capi message struct
 *
 * From CAPI 2.0 Development Kit AVM 1995 (msg.c)
 * Rewritten for Linux 1996 by Carsten Paeth <calle@calle.de>
 *
 * This software may be used and distributed according to the terms
 * of the GNU General Public License, incorporated herein by reference.
 *
 */

#include <linux/module.h>
#include <linux/string.h>
#include <linux/ctype.h>
#include <linux/stddef.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/init.h>
#include <linux/isdn/capiutil.h>
#include <linux/slab.h>

/* from CAPI2.0 DDK AVM Berlin GmbH */

typedef struct {
        int typ;
        size_t off;
} _cdef;

#define _CBYTE         1
#define _CWORD         2
#define _CDWORD        3
#define _CSTRUCT       4
#define _CMSTRUCT      5
#define _CEND          6

static _cdef cdef[] =
{
        /*00 */
        {_CEND},
        /*01 */
        {_CEND},
        /*02 */
        {_CEND},
        /*03 */
        {_CDWORD, offsetof(_cmsg, adr.adrController)},
        /*04 */
        {_CMSTRUCT, offsetof(_cmsg, AdditionalInfo)},
        /*05 */
        {_CSTRUCT, offsetof(_cmsg, B1configuration)},
        /*06 */
        {_CWORD, offsetof(_cmsg, B1protocol)},
        /*07 */
        {_CSTRUCT, offsetof(_cmsg, B2configuration)},
        /*08 */
        {_CWORD, offsetof(_cmsg, B2protocol)},
        /*09 */
        {_CSTRUCT, offsetof(_cmsg, B3configuration)},
        /*0a */
        {_CWORD, offsetof(_cmsg, B3protocol)},
        /*0b */
        {_CSTRUCT, offsetof(_cmsg, BC)},
        /*0c */
        {_CSTRUCT, offsetof(_cmsg, BChannelinformation)},
        /*0d */
        {_CMSTRUCT, offsetof(_cmsg, BProtocol)},
        /*0e */
        {_CSTRUCT, offsetof(_cmsg, CalledPartyNumber)},
        /*0f */
        {_CSTRUCT, offsetof(_cmsg, CalledPartySubaddress)},
        /*10 */
        {_CSTRUCT, offsetof(_cmsg, CallingPartyNumber)},
        /*11 */
        {_CSTRUCT, offsetof(_cmsg, CallingPartySubaddress)},
        /*12 */
        {_CDWORD, offsetof(_cmsg, CIPmask)},
        /*13 */
        {_CDWORD, offsetof(_cmsg, CIPmask2)},
        /*14 */
        {_CWORD, offsetof(_cmsg, CIPValue)},
        /*15 */
        {_CDWORD, offsetof(_cmsg, Class)},
        /*16 */
        {_CSTRUCT, offsetof(_cmsg, ConnectedNumber)},
        /*17 */
        {_CSTRUCT, offsetof(_cmsg, ConnectedSubaddress)},
        /*18 */
        {_CDWORD, offsetof(_cmsg, Data)},
        /*19 */
        {_CWORD, offsetof(_cmsg, DataHandle)},
        /*1a */
        {_CWORD, offsetof(_cmsg, DataLength)},
        /*1b */
        {_CSTRUCT, offsetof(_cmsg, FacilityConfirmationParameter)},
        /*1c */
        {_CSTRUCT, offsetof(_cmsg, Facilitydataarray)},
        /*1d */
        {_CSTRUCT, offsetof(_cmsg, FacilityIndicationParameter)},
        /*1e */
        {_CSTRUCT, offsetof(_cmsg, FacilityRequestParameter)},
        /*1f */
        {_CWORD, offsetof(_cmsg, FacilitySelector)},
        /*20 */
        {_CWORD, offsetof(_cmsg, Flags)},
        /*21 */
        {_CDWORD, offsetof(_cmsg, Function)},
        /*22 */
        {_CSTRUCT, offsetof(_cmsg, HLC)},
        /*23 */
        {_CWORD, offsetof(_cmsg, Info)},
        /*24 */
        {_CSTRUCT, offsetof(_cmsg, InfoElement)},
        /*25 */
        {_CDWORD, offsetof(_cmsg, InfoMask)},
        /*26 */
        {_CWORD, offsetof(_cmsg, InfoNumber)},
        /*27 */
        {_CSTRUCT, offsetof(_cmsg, Keypadfacility)},
        /*28 */
        {_CSTRUCT, offsetof(_cmsg, LLC)},
        /*29 */
        {_CSTRUCT, offsetof(_cmsg, ManuData)},
        /*2a */
        {_CDWORD, offsetof(_cmsg, ManuID)},
        /*2b */
        {_CSTRUCT, offsetof(_cmsg, NCPI)},
        /*2c */
        {_CWORD, offsetof(_cmsg, Reason)},
        /*2d */
        {_CWORD, offsetof(_cmsg, Reason_B3)},
        /*2e */
        {_CWORD, offsetof(_cmsg, Reject)},
        /*2f */
        {_CSTRUCT, offsetof(_cmsg, Useruserdata)}
};

static unsigned char *cpars[] =
{
        /* ALERT_REQ */ [0x01] = "\x03\x04\x0c\x27\x2f\x1c\x01\x01",
        /* CONNECT_REQ */ [0x02] = "\x03\x14\x0e\x10\x0f\x11\x0d\x06\x08\x0a\x05\x07\x09\x01\x0b\x28\x22\x04\x0c\x27\x2f\x1c\x01\x01",
        /* DISCONNECT_REQ */ [0x04] = "\x03\x04\x0c\x27\x2f\x1c\x01\x01",
        /* LISTEN_REQ */ [0x05] = "\x03\x25\x12\x13\x10\x11\x01",
        /* INFO_REQ */ [0x08] = "\x03\x0e\x04\x0c\x27\x2f\x1c\x01\x01",
        /* FACILITY_REQ */ [0x09] = "\x03\x1f\x1e\x01",
        /* SELECT_B_PROTOCOL_REQ */ [0x0a] = "\x03\x0d\x06\x08\x0a\x05\x07\x09\x01\x01",
        /* CONNECT_B3_REQ */ [0x0b] = "\x03\x2b\x01",
        /* DISCONNECT_B3_REQ */ [0x0d] = "\x03\x2b\x01",
        /* DATA_B3_REQ */ [0x0f] = "\x03\x18\x1a\x19\x20\x01",
        /* RESET_B3_REQ */ [0x10] = "\x03\x2b\x01",
        /* ALERT_CONF */ [0x13] = "\x03\x23\x01",
        /* CONNECT_CONF */ [0x14] = "\x03\x23\x01",
        /* DISCONNECT_CONF */ [0x16] = "\x03\x23\x01",
        /* LISTEN_CONF */ [0x17] = "\x03\x23\x01",
        /* MANUFACTURER_REQ */ [0x18] = "\x03\x2a\x15\x21\x29\x01",
        /* INFO_CONF */ [0x1a] = "\x03\x23\x01",
        /* FACILITY_CONF */ [0x1b] = "\x03\x23\x1f\x1b\x01",
        /* SELECT_B_PROTOCOL_CONF */ [0x1c] = "\x03\x23\x01",
        /* CONNECT_B3_CONF */ [0x1d] = "\x03\x23\x01",
        /* DISCONNECT_B3_CONF */ [0x1f] = "\x03\x23\x01",
        /* DATA_B3_CONF */ [0x21] = "\x03\x19\x23\x01",
        /* RESET_B3_CONF */ [0x22] = "\x03\x23\x01",
        /* CONNECT_IND */ [0x26] = "\x03\x14\x0e\x10\x0f\x11\x0b\x28\x22\x04\x0c\x27\x2f\x1c\x01\x01",
        /* CONNECT_ACTIVE_IND */ [0x27] = "\x03\x16\x17\x28\x01",
        /* DISCONNECT_IND */ [0x28] = "\x03\x2c\x01",
        /* MANUFACTURER_CONF */ [0x2a] = "\x03\x2a\x15\x21\x29\x01",
        /* INFO_IND */ [0x2c] = "\x03\x26\x24\x01",
        /* FACILITY_IND */ [0x2d] = "\x03\x1f\x1d\x01",
        /* CONNECT_B3_IND */ [0x2f] = "\x03\x2b\x01",
        /* CONNECT_B3_ACTIVE_IND */ [0x30] = "\x03\x2b\x01",
        /* DISCONNECT_B3_IND */ [0x31] = "\x03\x2d\x2b\x01",
        /* DATA_B3_IND */ [0x33] = "\x03\x18\x1a\x19\x20\x01",
        /* RESET_B3_IND */ [0x34] = "\x03\x2b\x01",
        /* CONNECT_B3_T90_ACTIVE_IND */ [0x35] = "\x03\x2b\x01",
        /* CONNECT_RESP */ [0x38] = "\x03\x2e\x0d\x06\x08\x0a\x05\x07\x09\x01\x16\x17\x28\x04\x0c\x27\x2f\x1c\x01\x01",
        /* CONNECT_ACTIVE_RESP */ [0x39] = "\x03\x01",
        /* DISCONNECT_RESP */ [0x3a] = "\x03\x01",
        /* MANUFACTURER_IND */ [0x3c] = "\x03\x2a\x15\x21\x29\x01",
        /* INFO_RESP */ [0x3e] = "\x03\x01",
        /* FACILITY_RESP */ [0x3f] = "\x03\x1f\x01",
        /* CONNECT_B3_RESP */ [0x41] = "\x03\x2e\x2b\x01",
        /* CONNECT_B3_ACTIVE_RESP */ [0x42] = "\x03\x01",
        /* DISCONNECT_B3_RESP */ [0x43] = "\x03\x01",
        /* DATA_B3_RESP */ [0x45] = "\x03\x19\x01",
        /* RESET_B3_RESP */ [0x46] = "\x03\x01",
        /* CONNECT_B3_T90_ACTIVE_RESP */ [0x47] = "\x03\x01",
        /* MANUFACTURER_RESP */ [0x4e] = "\x03\x2a\x15\x21\x29\x01",
};

/*-------------------------------------------------------*/

#define byteTLcpy(x, y)         *(u8 *)(x) = *(u8 *)(y);
#define wordTLcpy(x, y)         *(u16 *)(x) = *(u16 *)(y);
#define dwordTLcpy(x, y)        memcpy(x, y, 4);
#define structTLcpy(x, y, l)    memcpy(x, y, l)
#define structTLcpyovl(x, y, l) memmove(x, y, l)

#define byteTRcpy(x, y)         *(u8 *)(y) = *(u8 *)(x);
#define wordTRcpy(x, y)         *(u16 *)(y) = *(u16 *)(x);
#define dwordTRcpy(x, y)        memcpy(y, x, 4);
#define structTRcpy(x, y, l)    memcpy(y, x, l)
#define structTRcpyovl(x, y, l) memmove(y, x, l)

/*-------------------------------------------------------*/
static unsigned command_2_index(u8 c, u8 sc)
{
        if (c & 0x80)
                c = 0x9 + (c & 0x0f);
        else if (c == 0x41)
                c = 0x9 + 0x1;
        if (c > 0x18)
                c = 0x00;
        return (sc & 3) * (0x9 + 0x9) + c;
}

/**
 * capi_cmd2par() - find parameter string for CAPI 2.0 command/subcommand
 * @cmd:        command number
 * @subcmd:     subcommand number
 *
 * Return value: static string, NULL if command/subcommand unknown
 */

static unsigned char *capi_cmd2par(u8 cmd, u8 subcmd)
{
        return cpars[command_2_index(cmd, subcmd)];
}

/*-------------------------------------------------------*/
#define TYP (cdef[cmsg->par[cmsg->p]].typ)
#define OFF (((u8 *)cmsg) + cdef[cmsg->par[cmsg->p]].off)

static void jumpcstruct(_cmsg *cmsg)
{
        unsigned layer;
        for (cmsg->p++, layer = 1; layer;) {
                /* $$$$$ assert (cmsg->p); */
                cmsg->p++;
                switch (TYP) {
                case _CMSTRUCT:
                        layer++;
                        break;
                case _CEND:
                        layer--;
                        break;
                }
        }
}
/*-------------------------------------------------------*/
static void pars_2_message(_cmsg *cmsg)
{

        for (; TYP != _CEND; cmsg->p++) {
                switch (TYP) {
                case _CBYTE:
                        byteTLcpy(cmsg->m + cmsg->l, OFF);
                        cmsg->l++;
                        break;
                case _CWORD:
                        wordTLcpy(cmsg->m + cmsg->l, OFF);
                        cmsg->l += 2;
                        break;
                case _CDWORD:
                        dwordTLcpy(cmsg->m + cmsg->l, OFF);
                        cmsg->l += 4;
                        break;
                case _CSTRUCT:
                        if (*(u8 **) OFF == NULL) {
                                *(cmsg->m + cmsg->l) = '\0';
                                cmsg->l++;
                        } else if (**(_cstruct *) OFF != 0xff) {
                                structTLcpy(cmsg->m + cmsg->l, *(_cstruct *) OFF, 1 + **(_cstruct *) OFF);
                                cmsg->l += 1 + **(_cstruct *) OFF;
                        } else {
                                _cstruct s = *(_cstruct *) OFF;
                                structTLcpy(cmsg->m + cmsg->l, s, 3 + *(u16 *) (s + 1));
                                cmsg->l += 3 + *(u16 *) (s + 1);
                        }
                        break;
                case _CMSTRUCT:
/*----- Metastruktur 0 -----*/
                        if (*(_cmstruct *) OFF == CAPI_DEFAULT) {
                                *(cmsg->m + cmsg->l) = '\0';
                                cmsg->l++;
                                jumpcstruct(cmsg);
                        }
/*----- Metastruktur wird composed -----*/
                        else {
                                unsigned _l = cmsg->l;
                                unsigned _ls;
                                cmsg->l++;
                                cmsg->p++;
                                pars_2_message(cmsg);
                                _ls = cmsg->l - _l - 1;
                                if (_ls < 255)
                                        (cmsg->m + _l)[0] = (u8) _ls;
                                else {
                                        structTLcpyovl(cmsg->m + _l + 3, cmsg->m + _l + 1, _ls);
                                        (cmsg->m + _l)[0] = 0xff;
                                        wordTLcpy(cmsg->m + _l + 1, &_ls);
                                }
                        }
                        break;
                }
        }
}

/**
 * capi_cmsg2message() - assemble CAPI 2.0 message from _cmsg structure
 * @cmsg:       _cmsg structure
 * @msg:        buffer for assembled message
 *
 * Return value: 0 for success
 */

unsigned capi_cmsg2message(_cmsg *cmsg, u8 *msg)
{
        cmsg->m = msg;
        cmsg->l = 8;
        cmsg->p = 0;
        cmsg->par = capi_cmd2par(cmsg->Command, cmsg->Subcommand);
        if (!cmsg->par)
                return 1;       /* invalid command/subcommand */

        pars_2_message(cmsg);

        wordTLcpy(msg + 0, &cmsg->l);
        byteTLcpy(cmsg->m + 4, &cmsg->Command);
        byteTLcpy(cmsg->m + 5, &cmsg->Subcommand);
        wordTLcpy(cmsg->m + 2, &cmsg->ApplId);
        wordTLcpy(cmsg->m + 6, &cmsg->Messagenumber);

        return 0;
}

/*-------------------------------------------------------*/
static void message_2_pars(_cmsg *cmsg)
{
        for (; TYP != _CEND; cmsg->p++) {

                switch (TYP) {
                case _CBYTE:
                        byteTRcpy(cmsg->m + cmsg->l, OFF);
                        cmsg->l++;
                        break;
                case _CWORD:
                        wordTRcpy(cmsg->m + cmsg->l, OFF);
                        cmsg->l += 2;
                        break;
                case _CDWORD:
                        dwordTRcpy(cmsg->m + cmsg->l, OFF);
                        cmsg->l += 4;
                        break;
                case _CSTRUCT:
                        *(u8 **) OFF = cmsg->m + cmsg->l;

                        if (cmsg->m[cmsg->l] != 0xff)
                                cmsg->l += 1 + cmsg->m[cmsg->l];
                        else
                                cmsg->l += 3 + *(u16 *) (cmsg->m + cmsg->l + 1);
                        break;
                case _CMSTRUCT:
/*----- Metastruktur 0 -----*/
                        if (cmsg->m[cmsg->l] == '\0') {
                                *(_cmstruct *) OFF = CAPI_DEFAULT;
                                cmsg->l++;
                                jumpcstruct(cmsg);
                        } else {
                                unsigned _l = cmsg->l;
                                *(_cmstruct *) OFF = CAPI_COMPOSE;
                                cmsg->l = (cmsg->m + _l)[0] == 255 ? cmsg->l + 3 : cmsg->l + 1;
                                cmsg->p++;
                                message_2_pars(cmsg);
                        }
                        break;
                }
        }
}

/**
 * capi_message2cmsg() - disassemble CAPI 2.0 message into _cmsg structure
 * @cmsg:       _cmsg structure
 * @msg:        buffer for assembled message
 *
 * Return value: 0 for success
 */

unsigned capi_message2cmsg(_cmsg *cmsg, u8 *msg)
{
        memset(cmsg, 0, sizeof(_cmsg));
        cmsg->m = msg;
        cmsg->l = 8;
        cmsg->p = 0;
        byteTRcpy(cmsg->m + 4, &cmsg->Command);
        byteTRcpy(cmsg->m + 5, &cmsg->Subcommand);
        cmsg->par = capi_cmd2par(cmsg->Command, cmsg->Subcommand);
        if (!cmsg->par)
                return 1;       /* invalid command/subcommand */

        message_2_pars(cmsg);

        wordTRcpy(msg + 0, &cmsg->l);
        wordTRcpy(cmsg->m + 2, &cmsg->ApplId);
        wordTRcpy(cmsg->m + 6, &cmsg->Messagenumber);

        return 0;
}

/**
 * capi_cmsg_header() - initialize header part of _cmsg structure
 * @cmsg:       _cmsg structure
 * @_ApplId:    ApplID field value
 * @_Command:   Command field value
 * @_Subcommand:        Subcommand field value
 * @_Messagenumber:     Message Number field value
 * @_Controller:        Controller/PLCI/NCCI field value
 *
 * Return value: 0 for success
 */

unsigned capi_cmsg_header(_cmsg *cmsg, u16 _ApplId,
                          u8 _Command, u8 _Subcommand,
                          u16 _Messagenumber, u32 _Controller)
{
        memset(cmsg, 0, sizeof(_cmsg));
        cmsg->ApplId = _ApplId;
        cmsg->Command = _Command;
        cmsg->Subcommand = _Subcommand;
        cmsg->Messagenumber = _Messagenumber;
        cmsg->adr.adrController = _Controller;
        return 0;
}

/*-------------------------------------------------------*/

static char *mnames[] =
{
        [0x01] = "ALERT_REQ",
        [0x02] = "CONNECT_REQ",
        [0x04] = "DISCONNECT_REQ",
        [0x05] = "LISTEN_REQ",
        [0x08] = "INFO_REQ",
        [0x09] = "FACILITY_REQ",
        [0x0a] = "SELECT_B_PROTOCOL_REQ",
        [0x0b] = "CONNECT_B3_REQ",
        [0x0d] = "DISCONNECT_B3_REQ",
        [0x0f] = "DATA_B3_REQ",
        [0x10] = "RESET_B3_REQ",
        [0x13] = "ALERT_CONF",
        [0x14] = "CONNECT_CONF",
        [0x16] = "DISCONNECT_CONF",
        [0x17] = "LISTEN_CONF",
        [0x18] = "MANUFACTURER_REQ",
        [0x1a] = "INFO_CONF",
        [0x1b] = "FACILITY_CONF",
        [0x1c] = "SELECT_B_PROTOCOL_CONF",
        [0x1d] = "CONNECT_B3_CONF",
        [0x1f] = "DISCONNECT_B3_CONF",
        [0x21] = "DATA_B3_CONF",
        [0x22] = "RESET_B3_CONF",
        [0x26] = "CONNECT_IND",
        [0x27] = "CONNECT_ACTIVE_IND",
        [0x28] = "DISCONNECT_IND",
        [0x2a] = "MANUFACTURER_CONF",
        [0x2c] = "INFO_IND",
        [0x2d] = "FACILITY_IND",
        [0x2f] = "CONNECT_B3_IND",
        [0x30] = "CONNECT_B3_ACTIVE_IND",
        [0x31] = "DISCONNECT_B3_IND",
        [0x33] = "DATA_B3_IND",
        [0x34] = "RESET_B3_IND",
        [0x35] = "CONNECT_B3_T90_ACTIVE_IND",
        [0x38] = "CONNECT_RESP",
        [0x39] = "CONNECT_ACTIVE_RESP",
        [0x3a] = "DISCONNECT_RESP",
        [0x3c] = "MANUFACTURER_IND",
        [0x3e] = "INFO_RESP",
        [0x3f] = "FACILITY_RESP",
        [0x41] = "CONNECT_B3_RESP",
        [0x42] = "CONNECT_B3_ACTIVE_RESP",
        [0x43] = "DISCONNECT_B3_RESP",
        [0x45] = "DATA_B3_RESP",
        [0x46] = "RESET_B3_RESP",
        [0x47] = "CONNECT_B3_T90_ACTIVE_RESP",
        [0x4e] = "MANUFACTURER_RESP"
};

/**
 * capi_cmd2str() - convert CAPI 2.0 command/subcommand number to name
 * @cmd:        command number
 * @subcmd:     subcommand number
 *
 * Return value: static string
 */

char *capi_cmd2str(u8 cmd, u8 subcmd)
{
        char *result;

        result = mnames[command_2_index(cmd, subcmd)];
        if (result == NULL)
                result = "INVALID_COMMAND";
        return result;
}


/*-------------------------------------------------------*/

#ifdef CONFIG_CAPI_TRACE

/*-------------------------------------------------------*/

static char *pnames[] =
{
        /*00 */ NULL,
        /*01 */ NULL,
        /*02 */ NULL,
        /*03 */ "Controller/PLCI/NCCI",
        /*04 */ "AdditionalInfo",
        /*05 */ "B1configuration",
        /*06 */ "B1protocol",
        /*07 */ "B2configuration",
        /*08 */ "B2protocol",
        /*09 */ "B3configuration",
        /*0a */ "B3protocol",
        /*0b */ "BC",
        /*0c */ "BChannelinformation",
        /*0d */ "BProtocol",
        /*0e */ "CalledPartyNumber",
        /*0f */ "CalledPartySubaddress",
        /*10 */ "CallingPartyNumber",
        /*11 */ "CallingPartySubaddress",
        /*12 */ "CIPmask",
        /*13 */ "CIPmask2",
        /*14 */ "CIPValue",
        /*15 */ "Class",
        /*16 */ "ConnectedNumber",
        /*17 */ "ConnectedSubaddress",
        /*18 */ "Data32",
        /*19 */ "DataHandle",
        /*1a */ "DataLength",
        /*1b */ "FacilityConfirmationParameter",
        /*1c */ "Facilitydataarray",
        /*1d */ "FacilityIndicationParameter",
        /*1e */ "FacilityRequestParameter",
        /*1f */ "FacilitySelector",
        /*20 */ "Flags",
        /*21 */ "Function",
        /*22 */ "HLC",
        /*23 */ "Info",
        /*24 */ "InfoElement",
        /*25 */ "InfoMask",
        /*26 */ "InfoNumber",
        /*27 */ "Keypadfacility",
        /*28 */ "LLC",
        /*29 */ "ManuData",
        /*2a */ "ManuID",
        /*2b */ "NCPI",
        /*2c */ "Reason",
        /*2d */ "Reason_B3",
        /*2e */ "Reject",
        /*2f */ "Useruserdata"
};



#include <stdarg.h>

/*-------------------------------------------------------*/
static _cdebbuf *bufprint(_cdebbuf *cdb, char *fmt, ...)
{
        va_list f;
        size_t n, r;

        if (!cdb)
                return NULL;
        va_start(f, fmt);
        r = cdb->size - cdb->pos;
        n = vsnprintf(cdb->p, r, fmt, f);
        va_end(f);
        if (n >= r) {
                /* truncated, need bigger buffer */
                size_t ns = 2 * cdb->size;
                u_char *nb;

                while ((ns - cdb->pos) <= n)
                        ns *= 2;
                nb = kmalloc(ns, GFP_ATOMIC);
                if (!nb) {
                        cdebbuf_free(cdb);
                        return NULL;
                }
                memcpy(nb, cdb->buf, cdb->pos);
                kfree(cdb->buf);
                nb[cdb->pos] = 0;
                cdb->buf = nb;
                cdb->p = cdb->buf + cdb->pos;
                cdb->size = ns;
                va_start(f, fmt);
                r = cdb->size - cdb->pos;
                n = vsnprintf(cdb->p, r, fmt, f);
                va_end(f);
        }
        cdb->p += n;
        cdb->pos += n;
        return cdb;
}

static _cdebbuf *printstructlen(_cdebbuf *cdb, u8 *m, unsigned len)
{
        unsigned hex = 0;

        if (!cdb)
                return NULL;
        for (; len; len--, m++)
                if (isalnum(*m) || *m == ' ') {
                        if (hex)
                                cdb = bufprint(cdb, ">");
                        cdb = bufprint(cdb, "%c", *m);
                        hex = 0;
                } else {
                        if (!hex)
                                cdb = bufprint(cdb, "<%02x", *m);
                        else
                                cdb = bufprint(cdb, " %02x", *m);
                        hex = 1;
                }
        if (hex)
                cdb = bufprint(cdb, ">");
        return cdb;
}

static _cdebbuf *printstruct(_cdebbuf *cdb, u8 *m)
{
        unsigned len;

        if (m[0] != 0xff) {
                len = m[0];
                m += 1;
        } else {
                len = ((u16 *) (m + 1))[0];
                m += 3;
        }
        cdb = printstructlen(cdb, m, len);
        return cdb;
}

/*-------------------------------------------------------*/
#define NAME (pnames[cmsg->par[cmsg->p]])

static _cdebbuf *protocol_message_2_pars(_cdebbuf *cdb, _cmsg *cmsg, int level)
{
        if (!cmsg->par)
                return NULL;    /* invalid command/subcommand */

        for (; TYP != _CEND; cmsg->p++) {
                int slen = 29 + 3 - level;
                int i;

                if (!cdb)
                        return NULL;
                cdb = bufprint(cdb, "  ");
                for (i = 0; i < level - 1; i++)
                        cdb = bufprint(cdb, " ");

                switch (TYP) {
                case _CBYTE:
                        cdb = bufprint(cdb, "%-*s = 0x%x\n", slen, NAME, *(u8 *) (cmsg->m + cmsg->l));
                        cmsg->l++;
                        break;
                case _CWORD:
                        cdb = bufprint(cdb, "%-*s = 0x%x\n", slen, NAME, *(u16 *) (cmsg->m + cmsg->l));
                        cmsg->l += 2;
                        break;
                case _CDWORD:
                        cdb = bufprint(cdb, "%-*s = 0x%lx\n", slen, NAME, *(u32 *) (cmsg->m + cmsg->l));
                        cmsg->l += 4;
                        break;
                case _CSTRUCT:
                        cdb = bufprint(cdb, "%-*s = ", slen, NAME);
                        if (cmsg->m[cmsg->l] == '\0')
                                cdb = bufprint(cdb, "default");
                        else
                                cdb = printstruct(cdb, cmsg->m + cmsg->l);
                        cdb = bufprint(cdb, "\n");
                        if (cmsg->m[cmsg->l] != 0xff)
                                cmsg->l += 1 + cmsg->m[cmsg->l];
                        else
                                cmsg->l += 3 + *(u16 *) (cmsg->m + cmsg->l + 1);

                        break;

                case _CMSTRUCT:
/*----- Metastruktur 0 -----*/
                        if (cmsg->m[cmsg->l] == '\0') {
                                cdb = bufprint(cdb, "%-*s = default\n", slen, NAME);
                                cmsg->l++;
                                jumpcstruct(cmsg);
                        } else {
                                char *name = NAME;
                                unsigned _l = cmsg->l;
                                cdb = bufprint(cdb, "%-*s\n", slen, name);
                                cmsg->l = (cmsg->m + _l)[0] == 255 ? cmsg->l + 3 : cmsg->l + 1;
                                cmsg->p++;
                                cdb = protocol_message_2_pars(cdb, cmsg, level + 1);
                        }
                        break;
                }
        }
        return cdb;
}
/*-------------------------------------------------------*/

static _cdebbuf *g_debbuf;
static u_long g_debbuf_lock;
static _cmsg *g_cmsg;

static _cdebbuf *cdebbuf_alloc(void)
{
        _cdebbuf *cdb;

        if (likely(!test_and_set_bit(1, &g_debbuf_lock))) {
                cdb = g_debbuf;
                goto init;
        } else
                cdb = kmalloc(sizeof(_cdebbuf), GFP_ATOMIC);
        if (!cdb)
                return NULL;
        cdb->buf = kmalloc(CDEBUG_SIZE, GFP_ATOMIC);
        if (!cdb->buf) {
                kfree(cdb);
                return NULL;
        }
        cdb->size = CDEBUG_SIZE;
init:
        cdb->buf[0] = 0;
        cdb->p = cdb->buf;
        cdb->pos = 0;
        return cdb;
}

/**
 * cdebbuf_free() - free CAPI debug buffer
 * @cdb:        buffer to free
 */

void cdebbuf_free(_cdebbuf *cdb)
{
        if (likely(cdb == g_debbuf)) {
                test_and_clear_bit(1, &g_debbuf_lock);
                return;
        }
        if (likely(cdb))
                kfree(cdb->buf);
        kfree(cdb);
}


/**
 * capi_message2str() - format CAPI 2.0 message for printing
 * @msg:        CAPI 2.0 message
 *
 * Allocates a CAPI debug buffer and fills it with a printable representation
 * of the CAPI 2.0 message in @msg.
 * Return value: allocated debug buffer, NULL on error
 * The returned buffer should be freed by a call to cdebbuf_free() after use.
 */

_cdebbuf *capi_message2str(u8 *msg)
{
        _cdebbuf *cdb;
        _cmsg   *cmsg;

        cdb = cdebbuf_alloc();
        if (unlikely(!cdb))
                return NULL;
        if (likely(cdb == g_debbuf))
                cmsg = g_cmsg;
        else
                cmsg = kmalloc(sizeof(_cmsg), GFP_ATOMIC);
        if (unlikely(!cmsg)) {
                cdebbuf_free(cdb);
                return NULL;
        }
        cmsg->m = msg;
        cmsg->l = 8;
        cmsg->p = 0;
        byteTRcpy(cmsg->m + 4, &cmsg->Command);
        byteTRcpy(cmsg->m + 5, &cmsg->Subcommand);
        cmsg->par = capi_cmd2par(cmsg->Command, cmsg->Subcommand);

        cdb = bufprint(cdb, "%-26s ID=%03d #0x%04x LEN=%04d\n",
                       capi_cmd2str(cmsg->Command, cmsg->Subcommand),
                       ((unsigned short *) msg)[1],
                       ((unsigned short *) msg)[3],
                       ((unsigned short *) msg)[0]);

        cdb = protocol_message_2_pars(cdb, cmsg, 1);
        if (unlikely(cmsg != g_cmsg))
                kfree(cmsg);
        return cdb;
}

/**
 * capi_cmsg2str() - format _cmsg structure for printing
 * @cmsg:       _cmsg structure
 *
 * Allocates a CAPI debug buffer and fills it with a printable representation
 * of the CAPI 2.0 message stored in @cmsg by a previous call to
 * capi_cmsg2message() or capi_message2cmsg().
 * Return value: allocated debug buffer, NULL on error
 * The returned buffer should be freed by a call to cdebbuf_free() after use.
 */

_cdebbuf *capi_cmsg2str(_cmsg *cmsg)
{
        _cdebbuf *cdb;

        if (!cmsg->m)
                return NULL;    /* no message */
        cdb = cdebbuf_alloc();
        if (!cdb)
                return NULL;
        cmsg->l = 8;
        cmsg->p = 0;
        cdb = bufprint(cdb, "%s ID=%03d #0x%04x LEN=%04d\n",
                       capi_cmd2str(cmsg->Command, cmsg->Subcommand),
                       ((u16 *) cmsg->m)[1],
                       ((u16 *) cmsg->m)[3],
                       ((u16 *) cmsg->m)[0]);
        cdb = protocol_message_2_pars(cdb, cmsg, 1);
        return cdb;
}

int __init cdebug_init(void)
{
        g_cmsg = kmalloc(sizeof(_cmsg), GFP_KERNEL);
        if (!g_cmsg)
                return -ENOMEM;
        g_debbuf = kmalloc(sizeof(_cdebbuf), GFP_KERNEL);
        if (!g_debbuf) {
                kfree(g_cmsg);
                return -ENOMEM;
        }
        g_debbuf->buf = kmalloc(CDEBUG_GSIZE, GFP_KERNEL);
        if (!g_debbuf->buf) {
                kfree(g_cmsg);
                kfree(g_debbuf);
                return -ENOMEM;
        }
        g_debbuf->size = CDEBUG_GSIZE;
        g_debbuf->buf[0] = 0;
        g_debbuf->p = g_debbuf->buf;
        g_debbuf->pos = 0;
        return 0;
}

void __exit cdebug_exit(void)
{
        if (g_debbuf)
                kfree(g_debbuf->buf);
        kfree(g_debbuf);
        kfree(g_cmsg);
}

#else /* !CONFIG_CAPI_TRACE */

static _cdebbuf g_debbuf = {"CONFIG_CAPI_TRACE not enabled", NULL, 0, 0};

_cdebbuf *capi_message2str(u8 *msg)
{
        return &g_debbuf;
}

_cdebbuf *capi_cmsg2str(_cmsg *cmsg)
{
        return &g_debbuf;
}

void cdebbuf_free(_cdebbuf *cdb)
{
}

int __init cdebug_init(void)
{
        return 0;
}

void __exit cdebug_exit(void)
{
}

#endif

EXPORT_SYMBOL(cdebbuf_free);
EXPORT_SYMBOL(capi_cmsg2message);
EXPORT_SYMBOL(capi_message2cmsg);
EXPORT_SYMBOL(capi_cmsg_header);
EXPORT_SYMBOL(capi_cmd2str);
EXPORT_SYMBOL(capi_cmsg2str);
EXPORT_SYMBOL(capi_message2str);