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firebird_driver.c
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/*
+----------------------------------------------------------------------+
| Copyright (c) The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 3.01 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| https://www.php.net/license/3_01.txt |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| [email protected] so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Author: Ard Biesheuvel <[email protected]> |
+----------------------------------------------------------------------+
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#ifndef _GNU_SOURCE
# define _GNU_SOURCE
#endif
#include "php.h"
#include "zend_exceptions.h"
#include "php_ini.h"
#include "ext/standard/info.h"
#include "pdo/php_pdo.h"
#include "pdo/php_pdo_driver.h"
#include "php_pdo_firebird.h"
#include "php_pdo_firebird_int.h"
static int php_firebird_alloc_prepare_stmt(pdo_dbh_t*, const zend_string*, XSQLDA*, isc_stmt_handle*,
HashTable*);
static bool php_firebird_rollback_transaction(pdo_dbh_t *dbh);
const char CHR_LETTER = 1;
const char CHR_DIGIT = 2;
const char CHR_IDENT = 4;
const char CHR_QUOTE = 8;
const char CHR_WHITE = 16;
const char CHR_HEX = 32;
const char CHR_INTRODUCER = 64;
static const char classes_array[] = {
/* 000 */ 0,
/* 001 */ 0,
/* 002 */ 0,
/* 003 */ 0,
/* 004 */ 0,
/* 005 */ 0,
/* 006 */ 0,
/* 007 */ 0,
/* 008 */ 0,
/* 009 */ 16, /* CHR_WHITE */
/* 010 */ 16, /* CHR_WHITE */
/* 011 */ 0,
/* 012 */ 0,
/* 013 */ 16, /* CHR_WHITE */
/* 014 */ 0,
/* 015 */ 0,
/* 016 */ 0,
/* 017 */ 0,
/* 018 */ 0,
/* 019 */ 0,
/* 020 */ 0,
/* 021 */ 0,
/* 022 */ 0,
/* 023 */ 0,
/* 024 */ 0,
/* 025 */ 0,
/* 026 */ 0,
/* 027 */ 0,
/* 028 */ 0,
/* 029 */ 0,
/* 030 */ 0,
/* 031 */ 0,
/* 032 */ 16, /* CHR_WHITE */
/* 033 ! */ 0,
/* 034 " */ 8, /* CHR_QUOTE */
/* 035 # */ 0,
/* 036 $ */ 4, /* CHR_IDENT */
/* 037 % */ 0,
/* 038 & */ 0,
/* 039 ' */ 8, /* CHR_QUOTE */
/* 040 ( */ 0,
/* 041 ) */ 0,
/* 042 * */ 0,
/* 043 + */ 0,
/* 044 , */ 0,
/* 045 - */ 0,
/* 046 . */ 0,
/* 047 / */ 0,
/* 048 0 */ 38, /* CHR_DIGIT | CHR_IDENT | CHR_HEX */
/* 049 1 */ 38, /* CHR_DIGIT | CHR_IDENT | CHR_HEX */
/* 050 2 */ 38, /* CHR_DIGIT | CHR_IDENT | CHR_HEX */
/* 051 3 */ 38, /* CHR_DIGIT | CHR_IDENT | CHR_HEX */
/* 052 4 */ 38, /* CHR_DIGIT | CHR_IDENT | CHR_HEX */
/* 053 5 */ 38, /* CHR_DIGIT | CHR_IDENT | CHR_HEX */
/* 054 6 */ 38, /* CHR_DIGIT | CHR_IDENT | CHR_HEX */
/* 055 7 */ 38, /* CHR_DIGIT | CHR_IDENT | CHR_HEX */
/* 056 8 */ 38, /* CHR_DIGIT | CHR_IDENT | CHR_HEX */
/* 057 9 */ 38, /* CHR_DIGIT | CHR_IDENT | CHR_HEX */
/* 058 : */ 0,
/* 059 ; */ 0,
/* 060 < */ 0,
/* 061 = */ 0,
/* 062 > */ 0,
/* 063 ? */ 0,
/* 064 @ */ 0,
/* 065 A */ 37, /* CHR_LETTER | CHR_IDENT | CHR_HEX */
/* 066 B */ 37, /* CHR_LETTER | CHR_IDENT | CHR_HEX */
/* 067 C */ 37, /* CHR_LETTER | CHR_IDENT | CHR_HEX */
/* 068 D */ 37, /* CHR_LETTER | CHR_IDENT | CHR_HEX */
/* 069 E */ 37, /* CHR_LETTER | CHR_IDENT | CHR_HEX */
/* 070 F */ 37, /* CHR_LETTER | CHR_IDENT | CHR_HEX */
/* 071 G */ 5, /* CHR_LETTER | CHR_IDENT */
/* 072 H */ 5, /* CHR_LETTER | CHR_IDENT */
/* 073 I */ 5, /* CHR_LETTER | CHR_IDENT */
/* 074 J */ 5, /* CHR_LETTER | CHR_IDENT */
/* 075 K */ 5, /* CHR_LETTER | CHR_IDENT */
/* 076 L */ 5, /* CHR_LETTER | CHR_IDENT */
/* 077 M */ 5, /* CHR_LETTER | CHR_IDENT */
/* 078 N */ 5, /* CHR_LETTER | CHR_IDENT */
/* 079 O */ 5, /* CHR_LETTER | CHR_IDENT */
/* 080 P */ 5, /* CHR_LETTER | CHR_IDENT */
/* 081 Q */ 5, /* CHR_LETTER | CHR_IDENT */
/* 082 R */ 5, /* CHR_LETTER | CHR_IDENT */
/* 083 S */ 5, /* CHR_LETTER | CHR_IDENT */
/* 084 T */ 5, /* CHR_LETTER | CHR_IDENT */
/* 085 U */ 5, /* CHR_LETTER | CHR_IDENT */
/* 086 V */ 5, /* CHR_LETTER | CHR_IDENT */
/* 087 W */ 5, /* CHR_LETTER | CHR_IDENT */
/* 088 X */ 5, /* CHR_LETTER | CHR_IDENT */
/* 089 Y */ 5, /* CHR_LETTER | CHR_IDENT */
/* 090 Z */ 5, /* CHR_LETTER | CHR_IDENT */
/* 091 [ */ 0,
/* 092 \ */ 0,
/* 093 ] */ 0,
/* 094 ^ */ 0,
/* 095 _ */ 68, /* CHR_IDENT | CHR_INTRODUCER */
/* 096 ` */ 0,
/* 097 a */ 37, /* CHR_LETTER | CHR_IDENT | CHR_HEX */
/* 098 b */ 37, /* CHR_LETTER | CHR_IDENT | CHR_HEX */
/* 099 c */ 37, /* CHR_LETTER | CHR_IDENT | CHR_HEX */
/* 100 d */ 37, /* CHR_LETTER | CHR_IDENT | CHR_HEX */
/* 101 e */ 37, /* CHR_LETTER | CHR_IDENT | CHR_HEX */
/* 102 f */ 37, /* CHR_LETTER | CHR_IDENT | CHR_HEX */
/* 103 g */ 5, /* CHR_LETTER | CHR_IDENT */
/* 104 h */ 5, /* CHR_LETTER | CHR_IDENT */
/* 105 i */ 5, /* CHR_LETTER | CHR_IDENT */
/* 106 j */ 5, /* CHR_LETTER | CHR_IDENT */
/* 107 k */ 5, /* CHR_LETTER | CHR_IDENT */
/* 108 l */ 5, /* CHR_LETTER | CHR_IDENT */
/* 109 m */ 5, /* CHR_LETTER | CHR_IDENT */
/* 110 n */ 5, /* CHR_LETTER | CHR_IDENT */
/* 111 o */ 5, /* CHR_LETTER | CHR_IDENT */
/* 112 p */ 5, /* CHR_LETTER | CHR_IDENT */
/* 113 q */ 5, /* CHR_LETTER | CHR_IDENT */
/* 114 r */ 5, /* CHR_LETTER | CHR_IDENT */
/* 115 s */ 5, /* CHR_LETTER | CHR_IDENT */
/* 116 t */ 5, /* CHR_LETTER | CHR_IDENT */
/* 117 u */ 5, /* CHR_LETTER | CHR_IDENT */
/* 118 v */ 5, /* CHR_LETTER | CHR_IDENT */
/* 119 w */ 5, /* CHR_LETTER | CHR_IDENT */
/* 120 x */ 5, /* CHR_LETTER | CHR_IDENT */
/* 121 y */ 5, /* CHR_LETTER | CHR_IDENT */
/* 122 z */ 5, /* CHR_LETTER | CHR_IDENT */
/* 123 { */ 5, /* CHR_LETTER | CHR_IDENT */
/* 124 | */ 0,
/* 125 } */ 5, /* CHR_LETTER | CHR_IDENT */
/* 126 ~ */ 0,
/* 127 */ 0
};
static inline char php_firebird_classes(char idx)
{
unsigned char uidx = (unsigned char) idx;
if (uidx > 127) return 0;
return classes_array[uidx];
}
typedef enum {
ttNone,
ttWhite,
ttComment,
ttBrokenComment,
ttString,
ttParamMark,
ttIdent,
ttOther
} FbTokenType;
static FbTokenType php_firebird_get_token(const char** begin, const char* end)
{
FbTokenType ret = ttNone;
const char* p = *begin;
char c = *p++;
switch (c)
{
case ':':
case '?':
ret = ttParamMark;
break;
case '\'':
case '"':
while (p < end)
{
if (*p++ == c)
{
ret = ttString;
break;
}
}
break;
case '/':
if (p < end && *p == '*')
{
ret = ttBrokenComment;
p++;
while (p < end)
{
if (*p++ == '*' && p < end && *p == '/')
{
p++;
ret = ttComment;
break;
}
}
}
else {
ret = ttOther;
}
break;
case '-':
if (p < end && *p == '-')
{
while (++p < end)
{
if (*p == '\r')
{
p++;
if (p < end && *p == '\n')
p++;
break;
}
else if (*p == '\n')
break;
}
ret = ttComment;
}
else
ret = ttOther;
break;
default:
if (php_firebird_classes(c) & CHR_DIGIT)
{
while (p < end && (php_firebird_classes(*p) & CHR_DIGIT))
p++;
ret = ttOther;
}
else if (php_firebird_classes(c) & CHR_IDENT)
{
while (p < end && (php_firebird_classes(*p) & CHR_IDENT))
p++;
ret = ttIdent;
}
else if (php_firebird_classes(c) & CHR_WHITE)
{
while (p < end && (php_firebird_classes(*p) & CHR_WHITE))
p++;
ret = ttWhite;
}
else
{
while (p < end && !(php_firebird_classes(*p) & (CHR_DIGIT | CHR_IDENT | CHR_WHITE)) &&
(*p != '/') && (*p != '-') && (*p != ':') && (*p != '?') &&
(*p != '\'') && (*p != '"'))
{
p++;
}
ret = ttOther;
}
}
*begin = p;
return ret;
}
static int php_firebird_preprocess(const zend_string* sql, char* sql_out, HashTable* named_params)
{
bool passAsIs = 1, execBlock = 0;
zend_long pindex = -1;
char pname[254], ident[253], ident2[253];
unsigned int l;
const char* p = ZSTR_VAL(sql), * end = ZSTR_VAL(sql) + ZSTR_LEN(sql);
const char* start = p;
FbTokenType tok = php_firebird_get_token(&p, end);
const char* i = start;
while (p < end && (tok == ttComment || tok == ttWhite))
{
i = p;
tok = php_firebird_get_token(&p, end);
}
if (p >= end || tok != ttIdent)
{
/* Execute statement preprocess SQL error */
/* Statement expected */
return 0;
}
/* skip leading comments ?? */
start = i;
l = p - i;
/* check the length of the identifier */
/* in Firebird 4.0 it is 63 characters, in previous versions 31 bytes */
if (l > 252) {
return 0;
}
strncpy(ident, i, l);
ident[l] = '\0';
if (!strcasecmp(ident, "EXECUTE"))
{
/* For EXECUTE PROCEDURE and EXECUTE BLOCK statements, named parameters must be processed. */
/* However, in EXECUTE BLOCK this is done in a special way. */
const char* i2 = p;
tok = php_firebird_get_token(&p, end);
while (p < end && (tok == ttComment || tok == ttWhite))
{
i2 = p;
tok = php_firebird_get_token(&p, end);
}
if (p >= end || tok != ttIdent)
{
/* Execute statement preprocess SQL error */
/* Statement expected */
return 0;
}
l = p - i2;
/* check the length of the identifier */
/* in Firebird 4.0 it is 63 characters, in previous versions 31 bytes */
if (l > 252) {
return 0;
}
strncpy(ident2, i2, l);
ident2[l] = '\0';
execBlock = !strcasecmp(ident2, "BLOCK");
passAsIs = 0;
}
else
{
/* Named parameters must be processed in the INSERT, UPDATE, DELETE, MERGE statements. */
/* If CTEs are present in the query, they begin with the WITH keyword. */
passAsIs = strcasecmp(ident, "INSERT") && strcasecmp(ident, "UPDATE") &&
strcasecmp(ident, "DELETE") && strcasecmp(ident, "MERGE") &&
strcasecmp(ident, "SELECT") && strcasecmp(ident, "WITH");
}
if (passAsIs)
{
strcpy(sql_out, ZSTR_VAL(sql));
return 1;
}
strncat(sql_out, start, p - start);
while (p < end)
{
start = p;
tok = php_firebird_get_token(&p, end);
switch (tok)
{
case ttParamMark:
tok = php_firebird_get_token(&p, end);
if (tok == ttIdent /*|| tok == ttString*/)
{
++pindex;
l = p - start;
/* check the length of the identifier */
/* in Firebird 4.0 it is 63 characters, in previous versions 31 bytes */
/* + symbol ":" */
if (l > 253) {
return 0;
}
strncpy(pname, start, l);
pname[l] = '\0';
if (named_params) {
zval tmp;
ZVAL_LONG(&tmp, pindex);
zend_hash_str_update(named_params, pname, l, &tmp);
}
strcat(sql_out, "?");
}
else
{
if (strncmp(start, "?", 1)) {
/* Execute statement preprocess SQL error */
/* Parameter name expected */
return 0;
}
++pindex;
strncat(sql_out, start, p - start);
}
break;
case ttIdent:
if (execBlock)
{
/* In the EXECUTE BLOCK statement, processing must be */
/* carried out up to the keyword AS. */
l = p - start;
/* check the length of the identifier */
/* in Firebird 4.0 it is 63 characters, in previous versions 31 bytes */
if (l > 252) {
return 0;
}
strncpy(ident, start, l);
ident[l] = '\0';
if (!strcasecmp(ident, "AS"))
{
strncat(sql_out, start, end - start);
return 1;
}
}
/* TODO Check this is correct? */
ZEND_FALLTHROUGH;
case ttWhite:
case ttComment:
case ttString:
case ttOther:
strncat(sql_out, start, p - start);
break;
case ttBrokenComment:
{
/* Execute statement preprocess SQL error */
/* Unclosed comment found near ''@1'' */
return 0;
}
break;
case ttNone:
/* Execute statement preprocess SQL error */
return 0;
break;
}
}
return 1;
}
/* map driver specific error message to PDO error */
void php_firebird_set_error(pdo_dbh_t *dbh, pdo_stmt_t *stmt, const char *state, const size_t state_len,
const char *msg, const size_t msg_len) /* {{{ */
{
pdo_error_type *const error_code = stmt ? &stmt->error_code : &dbh->error_code;
pdo_firebird_db_handle *H = (pdo_firebird_db_handle *)dbh->driver_data;
pdo_firebird_error_info *einfo = &H->einfo;
int sqlcode = -999;
if (einfo->errmsg) {
pefree(einfo->errmsg, dbh->is_persistent);
einfo->errmsg = NULL;
einfo->errmsg_length = 0;
}
if (H->isc_status && (H->isc_status[0] == 1 && H->isc_status[1] > 0)) {
char buf[512];
size_t buf_size = sizeof(buf), read_len = 0;
ssize_t tmp_len;
const ISC_STATUS *s = H->isc_status;
sqlcode = isc_sqlcode(s);
while ((buf_size > (read_len + 1)) && (tmp_len = fb_interpret(&buf[read_len], (buf_size - read_len - 1), &s)) && tmp_len > 0) {
read_len += tmp_len;
buf[read_len++] = ' ';
}
/* remove last space */
if (read_len) {
buf[read_len--] = '\0';
}
einfo->errmsg_length = read_len;
einfo->errmsg = pestrndup(buf, read_len, dbh->is_persistent);
#if FB_API_VER >= 25
char sqlstate[sizeof(pdo_error_type)];
fb_sqlstate(sqlstate, H->isc_status);
if (sqlstate != NULL && strlen(sqlstate) < sizeof(pdo_error_type)) {
strcpy(*error_code, sqlstate);
goto end;
}
#endif
} else if (msg && msg_len) {
einfo->errmsg_length = msg_len;
einfo->errmsg = pestrndup(msg, einfo->errmsg_length, dbh->is_persistent);
}
if (state && state_len && state_len < sizeof(pdo_error_type)) {
memcpy(*error_code, state, state_len + 1);
} else {
memcpy(*error_code, "HY000", sizeof("HY000"));
}
end:
einfo->sqlcode = sqlcode;
if (!dbh->methods) {
pdo_throw_exception(0, einfo->errmsg, error_code);
}
}
/* }}} */
/* called by PDO to close a db handle */
static void firebird_handle_closer(pdo_dbh_t *dbh) /* {{{ */
{
pdo_firebird_db_handle *H = (pdo_firebird_db_handle *)dbh->driver_data;
if (H->tr) {
if (dbh->auto_commit) {
php_firebird_commit_transaction(dbh, /* retain */ false);
} else {
php_firebird_rollback_transaction(dbh);
}
}
H->in_manually_txn = 0;
if (isc_detach_database(H->isc_status, &H->db)) {
php_firebird_error(dbh);
}
if (H->date_format) {
efree(H->date_format);
}
if (H->time_format) {
efree(H->time_format);
}
if (H->timestamp_format) {
efree(H->timestamp_format);
}
if (H->einfo.errmsg) {
pefree(H->einfo.errmsg, dbh->is_persistent);
H->einfo.errmsg = NULL;
}
pefree(H, dbh->is_persistent);
}
/* }}} */
/* called by PDO to prepare an SQL query */
static bool firebird_handle_preparer(pdo_dbh_t *dbh, zend_string *sql, /* {{{ */
pdo_stmt_t *stmt, zval *driver_options)
{
pdo_firebird_db_handle *H = (pdo_firebird_db_handle *)dbh->driver_data;
pdo_firebird_stmt *S = NULL;
HashTable *np;
do {
isc_stmt_handle s = PDO_FIREBIRD_HANDLE_INITIALIZER;
XSQLDA num_sqlda;
static char const info[] = { isc_info_sql_stmt_type };
char result[8];
num_sqlda.version = PDO_FB_SQLDA_VERSION;
num_sqlda.sqln = 1;
ALLOC_HASHTABLE(np);
zend_hash_init(np, 8, NULL, NULL, 0);
/* allocate and prepare statement */
if (!php_firebird_alloc_prepare_stmt(dbh, sql, &num_sqlda, &s, np)) {
break;
}
/* allocate a statement handle struct of the right size (struct out_sqlda is inlined) */
S = ecalloc(1, sizeof(*S)-sizeof(XSQLDA) + XSQLDA_LENGTH(num_sqlda.sqld));
S->H = H;
S->stmt = s;
S->out_sqlda.version = PDO_FB_SQLDA_VERSION;
S->out_sqlda.sqln = stmt->column_count = num_sqlda.sqld;
S->named_params = np;
/* determine the statement type */
if (isc_dsql_sql_info(H->isc_status, &s, sizeof(info), const_cast(info), sizeof(result),
result)) {
break;
}
S->statement_type = result[3];
/* fill the output sqlda with information about the prepared query */
if (isc_dsql_describe(H->isc_status, &s, PDO_FB_SQLDA_VERSION, &S->out_sqlda)) {
php_firebird_error(dbh);
break;
}
/* allocate the input descriptors */
if (isc_dsql_describe_bind(H->isc_status, &s, PDO_FB_SQLDA_VERSION, &num_sqlda)) {
break;
}
if (num_sqlda.sqld) {
S->in_sqlda = ecalloc(1,XSQLDA_LENGTH(num_sqlda.sqld));
S->in_sqlda->version = PDO_FB_SQLDA_VERSION;
S->in_sqlda->sqln = num_sqlda.sqld;
if (isc_dsql_describe_bind(H->isc_status, &s, PDO_FB_SQLDA_VERSION, S->in_sqlda)) {
break;
}
}
stmt->driver_data = S;
stmt->methods = &firebird_stmt_methods;
stmt->supports_placeholders = PDO_PLACEHOLDER_POSITIONAL;
return true;
} while (0);
php_firebird_error(dbh);
zend_hash_destroy(np);
FREE_HASHTABLE(np);
if (S) {
if (S->in_sqlda) {
efree(S->in_sqlda);
}
efree(S);
}
return false;
}
/* }}} */
/* called by PDO to execute a statement that doesn't produce a result set */
static zend_long firebird_handle_doer(pdo_dbh_t *dbh, const zend_string *sql) /* {{{ */
{
pdo_firebird_db_handle *H = (pdo_firebird_db_handle *)dbh->driver_data;
isc_stmt_handle stmt = PDO_FIREBIRD_HANDLE_INITIALIZER;
static char const info_count[] = { isc_info_sql_records };
char result[64];
int ret = 0;
XSQLDA in_sqlda, out_sqlda;
/* TODO no placeholders in exec() for now */
in_sqlda.version = out_sqlda.version = PDO_FB_SQLDA_VERSION;
in_sqlda.sqld = out_sqlda.sqld = 0;
out_sqlda.sqln = 1;
/* allocate and prepare statement */
if (!php_firebird_alloc_prepare_stmt(dbh, sql, &out_sqlda, &stmt, 0)) {
return -1;
}
/* execute the statement */
if (isc_dsql_execute2(H->isc_status, &H->tr, &stmt, PDO_FB_SQLDA_VERSION, &in_sqlda, &out_sqlda)) {
php_firebird_error(dbh);
ret = -1;
goto free_statement;
}
/* find out how many rows were affected */
if (isc_dsql_sql_info(H->isc_status, &stmt, sizeof(info_count), const_cast(info_count),
sizeof(result), result)) {
php_firebird_error(dbh);
ret = -1;
goto free_statement;
}
if (result[0] == isc_info_sql_records) {
unsigned i = 3, result_size = isc_vax_integer(&result[1],2);
if (result_size > sizeof(result)) {
ret = -1;
goto free_statement;
}
while (result[i] != isc_info_end && i < result_size) {
short len = (short)isc_vax_integer(&result[i+1],2);
/* bail out on bad len */
if (len != 1 && len != 2 && len != 4) {
ret = -1;
goto free_statement;
}
if (result[i] != isc_info_req_select_count) {
ret += isc_vax_integer(&result[i+3],len);
}
i += len+3;
}
}
if (dbh->auto_commit && !H->in_manually_txn) {
if (!php_firebird_commit_transaction(dbh, /* retain */ true)) {
ret = -1;
}
}
free_statement:
if (isc_dsql_free_statement(H->isc_status, &stmt, DSQL_drop)) {
php_firebird_error(dbh);
}
return ret;
}
/* }}} */
/* called by the PDO SQL parser to add quotes to values that are copied into SQL */
static zend_string* firebird_handle_quoter(pdo_dbh_t *dbh, const zend_string *unquoted, enum pdo_param_type paramtype)
{
int qcount = 0;
char const *co, *l, *r;
char *c;
size_t quotedlen;
zend_string *quoted_str;
if (ZSTR_LEN(unquoted) == 0) {
return ZSTR_INIT_LITERAL("''", 0);
}
/* Firebird only requires single quotes to be doubled if string lengths are used */
/* count the number of ' characters */
for (co = ZSTR_VAL(unquoted); (co = strchr(co,'\'')); qcount++, co++);
quotedlen = ZSTR_LEN(unquoted) + qcount + 2;
quoted_str = zend_string_alloc(quotedlen, 0);
c = ZSTR_VAL(quoted_str);
*c++ = '\'';
/* foreach (chunk that ends in a quote) */
for (l = ZSTR_VAL(unquoted); (r = strchr(l,'\'')); l = r+1) {
strncpy(c, l, r-l+1);
c += (r-l+1);
/* add the second quote */
*c++ = '\'';
}
/* copy the remainder */
strncpy(c, l, quotedlen-(c-ZSTR_VAL(quoted_str))-1);
ZSTR_VAL(quoted_str)[quotedlen-1] = '\'';
ZSTR_VAL(quoted_str)[quotedlen] = '\0';
return quoted_str;
}
/* }}} */
/* php_firebird_begin_transaction */
static bool php_firebird_begin_transaction(pdo_dbh_t *dbh, bool is_auto_commit_txn) /* {{{ */
{
pdo_firebird_db_handle *H = (pdo_firebird_db_handle *)dbh->driver_data;
/* isc_xxx are all 1 byte. */
char tpb[4] = { isc_tpb_version3 };
size_t tpb_size;
/* access mode. writable or readonly */
tpb[1] = H->is_writable_txn ? isc_tpb_write : isc_tpb_read;
if (is_auto_commit_txn) {
/*
* In autocommit mode, we need to always read the latest information, so we set `read committed`.
*/
tpb[2] = isc_tpb_read_committed;
/* Ignore indeterminate data from other transactions. This option only required with `read committed`. */
tpb[3] = isc_tpb_rec_version;
tpb_size = 4;
} else {
switch (H->txn_isolation_level) {
/*
* firebird's `read committed` has the option to wait until other transactions
* commit or rollback if there is indeterminate data.
* Introducing too many configuration values at once can cause confusion, so
* we don't support in PDO that feature yet.
*/
case PDO_FB_READ_COMMITTED:
tpb[2] = isc_tpb_read_committed;
/* Ignore indeterminate data from other transactions. This option only required with `read committed`. */
tpb[3] = isc_tpb_rec_version;
tpb_size = 4;
break;
case PDO_FB_SERIALIZABLE:
tpb[2] = isc_tpb_consistency;
tpb_size = 3;
break;
case PDO_FB_REPEATABLE_READ:
default:
tpb[2] = isc_tpb_concurrency;
tpb_size = 3;
break;
}
}
if (isc_start_transaction(H->isc_status, &H->tr, 1, &H->db, tpb_size, tpb)) {
php_firebird_error(dbh);
return false;
}
return true;
}
/* }}} */
/* called by PDO to start a transaction */
static bool firebird_handle_manually_begin(pdo_dbh_t *dbh) /* {{{ */
{
pdo_firebird_db_handle *H = (pdo_firebird_db_handle *)dbh->driver_data;
/**
* If in autocommit mode and in transaction, we will need to close the transaction once.
*/
if (dbh->auto_commit && H->tr) {
if (!php_firebird_commit_transaction(dbh, /* retain */ false)) {
return false;
}
}
if (!php_firebird_begin_transaction(dbh, /* auto commit mode */ false)) {
return false;
}
H->in_manually_txn = 1;
return true;
}
/* }}} */
/* php_firebird_commit_transaction */
bool php_firebird_commit_transaction(pdo_dbh_t *dbh, bool retain) /* {{{ */
{
pdo_firebird_db_handle *H = (pdo_firebird_db_handle *)dbh->driver_data;
/**
* `retaining` keeps the transaction open without closing it.
*
* firebird needs to always have a transaction open to emulate autocommit mode,
* and in autocommit mode it keeps the transaction open.
*
* Same as close and then begin again, but use retain to save overhead.
*/
if (retain) {
if (isc_commit_retaining(H->isc_status, &H->tr)) {
php_firebird_error(dbh);
return false;
}
} else {
if (isc_commit_transaction(H->isc_status, &H->tr)) {
php_firebird_error(dbh);
return false;
}
}
return true;
}
/* }}} */
/* called by PDO to commit a transaction */
static bool firebird_handle_manually_commit(pdo_dbh_t *dbh) /* {{{ */
{
pdo_firebird_db_handle *H = (pdo_firebird_db_handle *)dbh->driver_data;
if (!php_firebird_commit_transaction(dbh, /*release*/ false)) {
return false;
}
/**
* If in autocommit mode, begin the transaction again
* Reopen instead of retain because isolation level may change
*/
if (dbh->auto_commit) {
if (!php_firebird_begin_transaction(dbh, /* auto commit mode */ true)) {
return false;
}
}
H->in_manually_txn = 0;
return true;
}
/* }}} */
/* php_firebird_rollback_transaction */
static bool php_firebird_rollback_transaction(pdo_dbh_t *dbh) /* {{{ */
{
pdo_firebird_db_handle *H = (pdo_firebird_db_handle *)dbh->driver_data;
if (isc_rollback_transaction(H->isc_status, &H->tr)) {
php_firebird_error(dbh);
return false;
}
return true;
}
/* }}} */
/* called by PDO to rollback a transaction */
static bool firebird_handle_manually_rollback(pdo_dbh_t *dbh) /* {{{ */
{
pdo_firebird_db_handle *H = (pdo_firebird_db_handle *)dbh->driver_data;
if (!php_firebird_rollback_transaction(dbh)) {
return false;
}
/**
* If in autocommit mode, begin the transaction again
* Reopen instead of retain because isolation level may change
*/
if (dbh->auto_commit) {
if (!php_firebird_begin_transaction(dbh, /* auto commit mode */ true)) {
return false;
}
}
H->in_manually_txn = 0;
return true;
}
/* }}} */
/* used by prepare and exec to allocate a statement handle and prepare the SQL */
static int php_firebird_alloc_prepare_stmt(pdo_dbh_t *dbh, const zend_string *sql,
XSQLDA *out_sqlda, isc_stmt_handle *s, HashTable *named_params)
{
pdo_firebird_db_handle *H = (pdo_firebird_db_handle *)dbh->driver_data;
char *new_sql;
/* Firebird allows SQL statements up to 64k, so bail if it doesn't fit */
if (ZSTR_LEN(sql) > 65536) {
php_firebird_error_with_info(dbh, "01004", strlen("01004"), NULL, 0);
return 0;
}
/* allocate the statement */
if (isc_dsql_allocate_statement(H->isc_status, &H->db, s)) {
php_firebird_error(dbh);
return 0;
}
/* in order to support named params, which Firebird itself doesn't,
we need to replace :foo by ?, and store the name we just replaced */
new_sql = emalloc(ZSTR_LEN(sql)+1);
new_sql[0] = '\0';
if (!php_firebird_preprocess(sql, new_sql, named_params)) {
php_firebird_error_with_info(dbh, "07000", strlen("07000"), NULL, 0);
efree(new_sql);
return 0;
}
/* prepare the statement */
if (isc_dsql_prepare(H->isc_status, &H->tr, s, 0, new_sql, H->sql_dialect, out_sqlda)) {
php_firebird_error(dbh);
efree(new_sql);
return 0;
}
efree(new_sql);
return 1;
}
/* called by PDO to set a driver-specific dbh attribute */
static bool pdo_firebird_set_attribute(pdo_dbh_t *dbh, zend_long attr, zval *val) /* {{{ */
{
pdo_firebird_db_handle *H = (pdo_firebird_db_handle *)dbh->driver_data;
bool bval;
zend_long lval;
switch (attr) {
case PDO_ATTR_AUTOCOMMIT:
{
if (!pdo_get_bool_param(&bval, val)) {
return false;
}
if (H->in_manually_txn) {
/* change auto commit mode with an open transaction is illegal, because
we won't know what to do with it */
pdo_raise_impl_error(dbh, NULL, "HY000", "Cannot change autocommit mode while a transaction is already open");
return false;
}
/* ignore if the new value equals the old one */
if (dbh->auto_commit ^ bval) {
if (bval) {
/*
* change to auto commit mode.
* If the transaction is not started, start it.
*/
if (!H->tr) {
if (!php_firebird_begin_transaction(dbh, /* auto commit mode */ true)) {
return false;
}
}
} else {
/*
* change to not auto commit mode.
* close the transaction if exists.
*/
if (H->tr) {