common.h

#include "php.h"
#include "php_ini.h"

#ifndef REDIS_COMMON_H
#define REDIS_COMMON_H

#define PHPREDIS_NOTUSED(v) ((void)v)

#include <ext/standard/php_var.h>
#include <ext/standard/php_math.h>
#if (PHP_MAJOR_VERSION < 7)
#include <ext/standard/php_smart_str.h>
typedef smart_str smart_string;
#define smart_string_0(x) smart_str_0(x)
#define smart_string_appendc(dest, c) smart_str_appendc(dest, c)
#define smart_string_append_long(dest, val) smart_str_append_long(dest, val)
#define smart_string_appendl(dest, src, len) smart_str_appendl(dest, src, len)

typedef struct {
    short gc;
    size_t len;
    char *val;
} zend_string;


#define zend_string_release(s) do { \
    if ((s) && (s)->gc) { \
        if ((s)->gc & 0x10 && (s)->val) efree((s)->val); \
        if ((s)->gc & 0x01) efree((s)); \
    } \
} while (0)

#define ZEND_HASH_FOREACH_KEY_VAL(ht, _h, _key, _val) do { \
    HashPosition _hpos; \
    for (zend_hash_internal_pointer_reset_ex(ht, &_hpos); \
         (_val = zend_hash_get_current_data_ex(ht, &_hpos)) != NULL; \
         zend_hash_move_forward_ex(ht, &_hpos) \
    ) { \
        zend_string _zstr = {0}; \
        char *_str_index; uint _str_length; ulong _num_index; \
        switch (zend_hash_get_current_key_ex(ht, &_str_index, &_str_length, &_num_index, 0, &_hpos)) { \
            case HASH_KEY_IS_STRING: \
                _zstr.len = _str_length - 1; \
                _zstr.val = _str_index; \
                _key = &_zstr; \
                break; \
            case HASH_KEY_IS_LONG: \
                _key = NULL; \
                _h = _num_index; \
                break; \
            default: \
                continue; \
        }

#define ZEND_HASH_FOREACH_VAL(ht, _val) do { \
    HashPosition _hpos; \
    for (zend_hash_internal_pointer_reset_ex(ht, &_hpos); \
         (_val = zend_hash_get_current_data_ex(ht, &_hpos)) != NULL; \
         zend_hash_move_forward_ex(ht, &_hpos) \
    ) {

#define ZEND_HASH_FOREACH_END() \
    } \
} while(0)

#undef zend_hash_get_current_key
#define zend_hash_get_current_key(ht, str_index, num_index) \
    zend_hash_get_current_key_ex(ht, str_index, NULL, num_index, 0, NULL)

#define zend_hash_str_exists(ht, str, len) zend_hash_exists(ht, str, len + 1)

static zend_always_inline zval *
zend_hash_str_find(const HashTable *ht, const char *key, size_t len)
{
    zval **zv;

    if (zend_hash_find(ht, key, len + 1, (void **)&zv) == SUCCESS) {
        return *zv;
    }
    return NULL;
}

static zend_always_inline void *
zend_hash_str_find_ptr(const HashTable *ht, const char *str, size_t len)
{
    void **ptr;

    if (zend_hash_find(ht, str, len + 1, (void **)&ptr) == SUCCESS) {
        return *ptr;
    }
    return NULL;
}

static zend_always_inline void *
zend_hash_str_update_ptr(HashTable *ht, const char *str, size_t len, void *pData)
{
    if (zend_hash_update(ht, str, len + 1, (void *)&pData, sizeof(void *), NULL) == SUCCESS) {
        return pData;
    }
    return NULL;
}

static zend_always_inline void *
zend_hash_index_update_ptr(HashTable *ht, zend_ulong h, void *pData)
{
    if (zend_hash_index_update(ht, h, (void **)&pData, sizeof(void *), NULL) == SUCCESS) {
        return pData;
    }
    return NULL;
}

#undef zend_hash_get_current_data
static zend_always_inline zval *
zend_hash_get_current_data(HashTable *ht)
{
    zval **zv;

    if (zend_hash_get_current_data_ex(ht, (void **)&zv, NULL) == SUCCESS) {
        return *zv;
    }
    return NULL;
}

static zend_always_inline void *
zend_hash_get_current_data_ptr(HashTable *ht)
{
    void **ptr;

    if (zend_hash_get_current_data_ex(ht, (void **)&ptr, NULL) == SUCCESS) {
        return *ptr;
    }
    return NULL;
}

static int (*_zend_hash_index_find)(const HashTable *, ulong, void **) = &zend_hash_index_find;
#define zend_hash_index_find(ht, h) inline_zend_hash_index_find(ht, h)

static zend_always_inline zval *
inline_zend_hash_index_find(const HashTable *ht, zend_ulong h)
{
    zval **zv;
    if (_zend_hash_index_find(ht, h, (void **)&zv) == SUCCESS) {
        return *zv;
    }
    return NULL;
}

static zend_always_inline void *
zend_hash_index_find_ptr(const HashTable *ht, zend_ulong h)
{
    void **ptr;

    if (_zend_hash_index_find(ht, h, (void **)&ptr) == SUCCESS) {
        return *ptr;
    }
    return NULL;
}

static int (*_zend_hash_get_current_data_ex)(HashTable *, void **, HashPosition *) = &zend_hash_get_current_data_ex;
#define zend_hash_get_current_data_ex(ht, pos) inline_zend_hash_get_current_data_ex(ht, pos)
static zend_always_inline zval *
inline_zend_hash_get_current_data_ex(HashTable *ht, HashPosition *pos)
{
    zval **zv;
    if (_zend_hash_get_current_data_ex(ht, (void **)&zv, pos) == SUCCESS) {
        return *zv;
    }
    return NULL;
}

#undef zend_hash_next_index_insert
#define zend_hash_next_index_insert(ht, pData) \
    _zend_hash_next_index_insert(ht, pData ZEND_FILE_LINE_CC)
static zend_always_inline zval *
_zend_hash_next_index_insert(HashTable *ht, zval *pData ZEND_FILE_LINE_DC)
{
    if (_zend_hash_index_update_or_next_insert(ht, 0, &pData, sizeof(pData),
            NULL, HASH_NEXT_INSERT ZEND_FILE_LINE_CC) == SUCCESS
    ) {
        return pData;
    }
    return NULL;
}

#undef zend_get_parameters_array
#define zend_get_parameters_array(ht, param_count, argument_array) \
    inline_zend_get_parameters_array(ht, param_count, argument_array TSRMLS_CC)

static zend_always_inline int
inline_zend_get_parameters_array(int ht, int param_count, zval *argument_array TSRMLS_DC)
{
    int i, ret = FAILURE;
    zval **zv = ecalloc(param_count, sizeof(zval *));

    if (_zend_get_parameters_array(ht, param_count, zv TSRMLS_CC) == SUCCESS) {
        for (i = 0; i < param_count; i++) {
            argument_array[i] = *zv[i];
        }
        ret = SUCCESS;
    }
    efree(zv);
    return ret;
}

typedef zend_rsrc_list_entry zend_resource;

extern int (*_add_next_index_string)(zval *, const char *, int);
#define add_next_index_string(arg, str) _add_next_index_string(arg, str, 1);
extern int (*_add_next_index_stringl)(zval *, const char *, uint, int);
#define add_next_index_stringl(arg, str, length) _add_next_index_stringl(arg, str, length, 1);

#undef ZVAL_STRING
#define ZVAL_STRING(z, s) do { \
    const char *_s=(s); \
    ZVAL_STRINGL(z, _s, strlen(_s)); \
} while (0)
#undef RETVAL_STRING
#define RETVAL_STRING(s) ZVAL_STRING(return_value, s)
#undef RETURN_STRING
#define RETURN_STRING(s) { RETVAL_STRING(s); return; }
#undef ZVAL_STRINGL
#define ZVAL_STRINGL(z, s, l) do { \
    const char *__s=(s); int __l=l; \
    zval *__z = (z); \
    Z_STRLEN_P(__z) = __l; \
    Z_STRVAL_P(__z) = estrndup(__s, __l); \
    Z_TYPE_P(__z) = IS_STRING; \
} while(0)
#undef RETVAL_STRINGL
#define RETVAL_STRINGL(s, l) ZVAL_STRINGL(return_value, s, l)
#undef RETURN_STRINGL
#define RETURN_STRINGL(s, l) { RETVAL_STRINGL(s, l); return; }

static int (*_call_user_function)(HashTable *, zval **, zval *, zval *, zend_uint, zval *[] TSRMLS_DC) = &call_user_function;
#define call_user_function(function_table, object, function_name, retval_ptr, param_count, params) \
    inline_call_user_function(function_table, object, function_name, retval_ptr, param_count, params TSRMLS_CC)

static zend_always_inline int
inline_call_user_function(HashTable *function_table, zval *object, zval *function_name, zval *retval_ptr, zend_uint param_count, zval params[] TSRMLS_DC)
{
    int i, ret;
    zval **_params = NULL;
    if (!params) param_count = 0;
    if (param_count > 0) {
        _params = ecalloc(param_count, sizeof(zval *));
        for (i = 0; i < param_count; i++) {
            _params[i] = &params[i];
            INIT_PZVAL(_params[i]);
        }
    }
    ret = _call_user_function(function_table, &object, function_name, retval_ptr, param_count, _params TSRMLS_CC);
    if (_params) efree(_params);
    return ret;
}

#undef add_assoc_bool
#define add_assoc_bool(__arg, __key, __b) add_assoc_bool_ex(__arg, __key, strlen(__key), __b)
extern int (*_add_assoc_bool_ex)(zval *, const char *, uint, int);
#define add_assoc_bool_ex(_arg, _key, _key_len, _b) _add_assoc_bool_ex(_arg, _key, _key_len + 1, _b)

#undef add_assoc_long
#define add_assoc_long(__arg, __key, __n) add_assoc_long_ex(__arg, __key, strlen(__key), __n)
extern int (*_add_assoc_long_ex)(zval *, const char *, uint, long);
#define add_assoc_long_ex(_arg, _key, _key_len, _n) _add_assoc_long_ex(_arg, _key, _key_len + 1, _n)

#undef add_assoc_double
#define add_assoc_double(__arg, __key, __d) add_assoc_double_ex(__arg, __key, strlen(__key), __d)
extern int (*_add_assoc_double_ex)(zval *, const char *, uint, double);
#define add_assoc_double_ex(_arg, _key, _key_len, _d) _add_assoc_double_ex(_arg, _key, _key_len + 1, _d)

#undef add_assoc_string
#define add_assoc_string(__arg, __key, __str) add_assoc_string_ex(__arg, __key, strlen(__key), __str)
extern int (*_add_assoc_string_ex)(zval *, const char *, uint, char *, int);
#define add_assoc_string_ex(_arg, _key, _key_len, _str) _add_assoc_string_ex(_arg, _key, _key_len + 1, _str, 1)

extern int (*_add_assoc_stringl_ex)(zval *, const char *, uint, char *, uint, int);
#define add_assoc_stringl_ex(_arg, _key, _key_len, _str, _length) _add_assoc_stringl_ex(_arg, _key, _key_len + 1, _str, _length, 1)

#undef add_assoc_zval
#define add_assoc_zval(__arg, __key, __value) add_assoc_zval_ex(__arg, __key, strlen(__key), __value)
extern int (*_add_assoc_zval_ex)(zval *, const char *, uint, zval *);
#define add_assoc_zval_ex(_arg, _key, _key_len, _value) _add_assoc_zval_ex(_arg, _key, _key_len + 1, _value);

typedef long zend_long;
static zend_always_inline zend_long
zval_get_long(zval *op)
{
    switch (Z_TYPE_P(op)) {
        case IS_BOOL:
        case IS_LONG:
            return Z_LVAL_P(op);
        case IS_DOUBLE:
            return zend_dval_to_lval(Z_DVAL_P(op));
        case IS_STRING:
            {
                double dval;
                zend_long lval;
                zend_uchar type = is_numeric_string(Z_STRVAL_P(op), Z_STRLEN_P(op), &lval, &dval, 0);
                if (type == IS_LONG) {
                    return lval;
                } else if (type == IS_DOUBLE) {
                    return zend_dval_to_lval(dval);
                }
            }
            break;
        EMPTY_SWITCH_DEFAULT_CASE()
    }
    return 0;
}

static zend_always_inline double
zval_get_double(zval *op)
{
    switch (Z_TYPE_P(op)) {
        case IS_BOOL:
        case IS_LONG:
            return (double)Z_LVAL_P(op);
        case IS_DOUBLE:
            return Z_DVAL_P(op);
        case IS_STRING:
            return zend_strtod(Z_STRVAL_P(op), NULL);
        EMPTY_SWITCH_DEFAULT_CASE()
    }
    return 0.0;
}

static zend_always_inline zend_string *
zval_get_string(zval *op)
{
    zend_string *zstr = ecalloc(1, sizeof(zend_string));

    zstr->val = "";
    zstr->len = 0;
    switch (Z_TYPE_P(op)) {
        case IS_STRING:
            zstr->val = Z_STRVAL_P(op);
            zstr->len = Z_STRLEN_P(op);
            break;
        case IS_BOOL:
            if (Z_LVAL_P(op)) {
                zstr->val = "1";
                zstr->len = 1;
            }
            break;
        case IS_LONG: {
            zstr->gc = 0x10;
            zstr->len = spprintf(&zstr->val, 0, "%ld", Z_LVAL_P(op));
            break;
        }
        case IS_DOUBLE: {
            zstr->gc = 0x10;
            zstr->len = spprintf(&zstr->val, 0, "%g", Z_DVAL_P(op));
            break;
        }
        EMPTY_SWITCH_DEFAULT_CASE()
    }
    zstr->gc |= 0x01;
    return zstr;
}

extern void (*_php_var_serialize)(smart_str *, zval **, php_serialize_data_t * TSRMLS_DC);
#define php_var_serialize(buf, struc, data) _php_var_serialize(buf, &struc, data TSRMLS_CC)
extern int (*_php_var_unserialize)(zval **, const unsigned char **, const unsigned char *, php_unserialize_data_t * TSRMLS_DC);
#define php_var_unserialize(rval, p, max, var_hash) _php_var_unserialize(&rval, p, max, var_hash TSRMLS_CC)
typedef int strlen_t;

/* If ZEND_MOD_END isn't defined, use legacy version */
#ifndef ZEND_MOD_END
#define ZEND_MOD_END { NULL, NULL, NULL }
#endif

/* PHP_FE_END exists since 5.3.7 */
#ifndef PHP_FE_END
#define PHP_FE_END { NULL, NULL, NULL }
#endif

#else
#include <zend_smart_str.h>
#include <ext/standard/php_smart_string.h>
typedef size_t strlen_t;
#endif

/* NULL check so Eclipse doesn't go crazy */
#ifndef NULL
#define NULL   ((void *) 0)
#endif

#define redis_sock_name "Redis Socket Buffer"
#define REDIS_SOCK_STATUS_FAILED       0
#define REDIS_SOCK_STATUS_DISCONNECTED 1
#define REDIS_SOCK_STATUS_UNKNOWN      2
#define REDIS_SOCK_STATUS_CONNECTED    3

#define redis_multi_access_type_name "Redis Multi type access"

#define _NL "\r\n"

/* properties */
#define REDIS_NOT_FOUND 0
#define REDIS_STRING    1
#define REDIS_SET       2
#define REDIS_LIST      3
#define REDIS_ZSET      4
#define REDIS_HASH      5

#ifdef PHP_WIN32
#define PHP_REDIS_API __declspec(dllexport)
#else
#define PHP_REDIS_API
#endif

/* reply types */
typedef enum _REDIS_REPLY_TYPE {
    TYPE_EOF       = -1,
    TYPE_LINE      = '+',
    TYPE_INT       = ':',
    TYPE_ERR       = '-',
    TYPE_BULK      = '$',
    TYPE_MULTIBULK = '*'
} REDIS_REPLY_TYPE;

/* SCAN variants */
typedef enum _REDIS_SCAN_TYPE {
    TYPE_SCAN,
    TYPE_SSCAN,
    TYPE_HSCAN,
    TYPE_ZSCAN
} REDIS_SCAN_TYPE;

/* PUBSUB subcommands */
typedef enum _PUBSUB_TYPE {
    PUBSUB_CHANNELS,
    PUBSUB_NUMSUB,
    PUBSUB_NUMPAT
} PUBSUB_TYPE;

/* options */
#define REDIS_OPT_SERIALIZER         1
#define REDIS_OPT_PREFIX             2
#define REDIS_OPT_READ_TIMEOUT       3
#define REDIS_OPT_SCAN               4

/* cluster options */
#define REDIS_OPT_FAILOVER               5
#define REDIS_FAILOVER_NONE              0
#define REDIS_FAILOVER_ERROR             1
#define REDIS_FAILOVER_DISTRIBUTE        2
#define REDIS_FAILOVER_DISTRIBUTE_SLAVES 3
/* serializers */
#define REDIS_SERIALIZER_NONE        0
#define REDIS_SERIALIZER_PHP         1
#define REDIS_SERIALIZER_IGBINARY    2

/* SCAN options */
#define REDIS_SCAN_NORETRY 0
#define REDIS_SCAN_RETRY 1

/* GETBIT/SETBIT offset range limits */
#define BITOP_MIN_OFFSET 0
#define BITOP_MAX_OFFSET 4294967295U

/* Specific error messages we want to throw against */
#define REDIS_ERR_LOADING_MSG "LOADING Redis is loading the dataset in memory"
#define REDIS_ERR_LOADING_KW  "LOADING"
#define REDIS_ERR_AUTH_MSG    "NOAUTH Authentication required."
#define REDIS_ERR_AUTH_KW     "NOAUTH"
#define REDIS_ERR_SYNC_MSG    "MASTERDOWN Link with MASTER is down and slave-serve-stale-data is set to 'no'"
#define REDIS_ERR_SYNC_KW     "MASTERDOWN"

#define IF_MULTI() if(redis_sock->mode == MULTI)
#define IF_MULTI_OR_ATOMIC() if(redis_sock->mode == MULTI || redis_sock->mode == ATOMIC)\

#define IF_MULTI_OR_PIPELINE() if(redis_sock->mode == MULTI || redis_sock->mode == PIPELINE)
#define IF_PIPELINE() if(redis_sock->mode == PIPELINE)
#define IF_NOT_PIPELINE() if(redis_sock->mode != PIPELINE)
#define IF_NOT_MULTI() if(redis_sock->mode != MULTI)
#define IF_NOT_ATOMIC() if(redis_sock->mode != ATOMIC)
#define IF_ATOMIC() if(redis_sock->mode == ATOMIC)
#define ELSE_IF_MULTI() else IF_MULTI() { \
    if(redis_response_enqueued(redis_sock TSRMLS_CC) == 1) { \
        RETURN_ZVAL(getThis(), 1, 0);\
    } else { \
        RETURN_FALSE; \
    } \
}

#define ELSE_IF_PIPELINE() else IF_PIPELINE() { \
    RETURN_ZVAL(getThis(), 1, 0);\
}

#define MULTI_RESPONSE(callback) IF_MULTI_OR_PIPELINE() { \
    fold_item *f1, *current; \
    f1 = malloc(sizeof(fold_item)); \
    f1->fun = (void *)callback; \
    f1->next = NULL; \
    current = redis_sock->current;\
    if(current) current->next = f1; \
    redis_sock->current = f1; \
  }

#define PIPELINE_ENQUEUE_COMMAND(cmd, cmd_len) request_item *tmp; \
    struct request_item *current_request;\
    tmp = malloc(sizeof(request_item));\
    tmp->request_str = calloc(cmd_len, 1);\
    memcpy(tmp->request_str, cmd, cmd_len);\
    tmp->request_size = cmd_len;\
    tmp->next = NULL;\
    current_request = redis_sock->pipeline_current; \
    if(current_request) {\
        current_request->next = tmp;\
    } \
    redis_sock->pipeline_current = tmp; \
    if(NULL == redis_sock->pipeline_head) { \
        redis_sock->pipeline_head = redis_sock->pipeline_current;\
    }

#define SOCKET_WRITE_COMMAND(redis_sock, cmd, cmd_len) \
    if(redis_sock_write(redis_sock, cmd, cmd_len TSRMLS_CC) < 0) { \
    efree(cmd); \
    RETURN_FALSE; \
}

#define REDIS_SAVE_CALLBACK(callback, closure_context) \
    IF_MULTI_OR_PIPELINE() { \
        fold_item *f1, *current; \
        f1 = malloc(sizeof(fold_item)); \
        f1->fun = (void *)callback; \
        f1->ctx = closure_context; \
        f1->next = NULL; \
        current = redis_sock->current;\
        if(current) current->next = f1; \
        redis_sock->current = f1; \
        if(NULL == redis_sock->head) { \
            redis_sock->head = redis_sock->current;\
        }\
}

#define REDIS_ELSE_IF_MULTI(function, closure_context) \
    else IF_MULTI() { \
        if(redis_response_enqueued(redis_sock TSRMLS_CC) == 1) {\
            REDIS_SAVE_CALLBACK(function, closure_context); \
            RETURN_ZVAL(getThis(), 1, 0);\
        } else {\
            RETURN_FALSE;\
        }\
}

#define REDIS_ELSE_IF_PIPELINE(function, closure_context) \
    else IF_PIPELINE() { \
        REDIS_SAVE_CALLBACK(function, closure_context); \
        RETURN_ZVAL(getThis(), 1, 0); \
}

#define REDIS_PROCESS_REQUEST(redis_sock, cmd, cmd_len) \
    IF_PIPELINE() { \
        PIPELINE_ENQUEUE_COMMAND(cmd, cmd_len); \
    } else { \
        SOCKET_WRITE_COMMAND(redis_sock, cmd, cmd_len); \
    } \
    efree(cmd);

#define REDIS_PROCESS_RESPONSE_CLOSURE(function, closure_context) \
    REDIS_ELSE_IF_MULTI(function, closure_context) \
    REDIS_ELSE_IF_PIPELINE(function, closure_context);

#define REDIS_PROCESS_RESPONSE(function) \
    REDIS_PROCESS_RESPONSE_CLOSURE(function, NULL)

/* Clear redirection info */
#define REDIS_MOVED_CLEAR(redis_sock) \
    redis_sock->redir_slot = 0; \
    redis_sock->redir_port = 0; \
    redis_sock->redir_type = MOVED_NONE; \

/* Process a command assuming our command where our command building
 * function is redis_<cmdname>_cmd */
#define REDIS_PROCESS_CMD(cmdname, resp_func) \
    RedisSock *redis_sock; char *cmd; int cmd_len; void *ctx=NULL; \
    if(redis_sock_get(getThis(), &redis_sock TSRMLS_CC, 0)<0 || \
       redis_##cmdname##_cmd(INTERNAL_FUNCTION_PARAM_PASSTHRU,redis_sock, \
                             &cmd, &cmd_len, NULL, &ctx)==FAILURE) { \
            RETURN_FALSE; \
    } \
    REDIS_PROCESS_REQUEST(redis_sock, cmd, cmd_len); \
    IF_ATOMIC() { \
        resp_func(INTERNAL_FUNCTION_PARAM_PASSTHRU, redis_sock, NULL, ctx); \
    } \
    REDIS_PROCESS_RESPONSE_CLOSURE(resp_func,ctx);

/* Process a command but with a specific command building function 
 * and keyword which is passed to us*/
#define REDIS_PROCESS_KW_CMD(kw, cmdfunc, resp_func) \
    RedisSock *redis_sock; char *cmd; int cmd_len; void *ctx=NULL; \
    if(redis_sock_get(getThis(), &redis_sock TSRMLS_CC, 0)<0 || \
       cmdfunc(INTERNAL_FUNCTION_PARAM_PASSTHRU, redis_sock, kw, &cmd, \
               &cmd_len, NULL, &ctx)==FAILURE) { \
            RETURN_FALSE; \
    } \
    REDIS_PROCESS_REQUEST(redis_sock, cmd, cmd_len); \
    IF_ATOMIC() { \
        resp_func(INTERNAL_FUNCTION_PARAM_PASSTHRU, redis_sock, NULL, ctx); \
    } \
    REDIS_PROCESS_RESPONSE_CLOSURE(resp_func,ctx);

#define REDIS_STREAM_CLOSE_MARK_FAILED(redis_sock) \
    redis_stream_close(redis_sock TSRMLS_CC); \
    redis_sock->stream = NULL; \
    redis_sock->mode = ATOMIC; \
    redis_sock->status = REDIS_SOCK_STATUS_FAILED; \
    redis_sock->watching = 0

/* Extended SET argument detection */
#define IS_EX_ARG(a) \
    ((a[0]=='e' || a[0]=='E') && (a[1]=='x' || a[1]=='X') && a[2]=='\0')
#define IS_PX_ARG(a) \
    ((a[0]=='p' || a[0]=='P') && (a[1]=='x' || a[1]=='X') && a[2]=='\0')
#define IS_NX_ARG(a) \
    ((a[0]=='n' || a[0]=='N') && (a[1]=='x' || a[1]=='X') && a[2]=='\0')
#define IS_XX_ARG(a) \
    ((a[0]=='x' || a[0]=='X') && (a[1]=='x' || a[1]=='X') && a[2]=='\0')

#define IS_EX_PX_ARG(a) (IS_EX_ARG(a) || IS_PX_ARG(a))
#define IS_NX_XX_ARG(a) (IS_NX_ARG(a) || IS_XX_ARG(a))

/* Given a string and length, validate a zRangeByLex argument.  The semantics
 * here are that the argument must start with '(' or '[' or be just the char
 * '+' or '-' */
#define IS_LEX_ARG(s,l) \
    (l>0 && (*s=='(' || *s=='[' || (l==1 && (*s=='+' || *s=='-'))))

typedef enum {ATOMIC, MULTI, PIPELINE} redis_mode;

typedef struct fold_item {
    zval * (*fun)(INTERNAL_FUNCTION_PARAMETERS, void *, ...);
    void *ctx;
    struct fold_item *next;
} fold_item;

typedef struct request_item {
    char *request_str; 
    int request_size; /* size_t */
    struct request_item *next;
} request_item;

/* {{{ struct RedisSock */
typedef struct {
    php_stream     *stream;
    char           *host;
    short          port;
    char           *auth;
    double         timeout;
    double         read_timeout;
    long           retry_interval;
    int            failed;
    int            status;
    int            persistent;
    int            watching;
    char           *persistent_id;

    int            serializer;
    long           dbNumber;

    char           *prefix;
    int            prefix_len;

    redis_mode     mode;
    fold_item      *head;
    fold_item      *current;

    request_item   *pipeline_head;
    request_item   *pipeline_current;

    char           *err;
    int            err_len;
    zend_bool      lazy_connect;

    int            scan;

    int            readonly;
} RedisSock;
/* }}} */

void
free_reply_callbacks(zval *z_this, RedisSock *redis_sock);

#endif