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sqlite3odbc.c
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sqlite3odbc.c
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/**
* @file sqlite3odbc.c
* SQLite3 ODBC Driver main module.
*
* $Id: sqlite3odbc.c,v 1.183 2023/10/23 13:33:58 chw Exp chw $
*
* Copyright (c) 2004-2023 Christian Werner <[email protected]>
*
* See the file "license.terms" for information on usage
* and redistribution of this file and for a
* DISCLAIMER OF ALL WARRANTIES.
*/
#if defined(SQLITE_HAS_CODEC) && defined(SQLITE_API)
#undef WITH_SQLITE_DLLS
#undef SQLITE_DYNLOAD
#include "sqlite3.c"
#endif
#if defined(WITH_SQLITE_DLLS) && (WITH_SQLITE_DLLS > 1)
#define SQLITE_DYNLOAD 1
#undef HAVE_SQLITE3CLOSEV2
#endif
#include "sqlite3odbc.h"
#ifdef SQLITE_DYNLOAD
#undef MEMORY_DEBUG
#if defined(_WIN32) || defined(_WIN64)
static void dls_init(void);
static void dls_fini(void);
#else
void dls_init(void);
void dls_fini(void);
#endif
static struct dl_sqlite3_funcs {
void (*activate_see)(const char *p0);
int (*bind_blob)(sqlite3_stmt *p0, int p1, const void *p2, int p3,
void (*p4)(void *));
int (*bind_double)(sqlite3_stmt *p0, int p1, double p2);
int (*bind_int)(sqlite3_stmt *p0, int p1, int p2);
int (*bind_int64)(sqlite3_stmt *p0, int p1, sqlite_int64 p2);
int (*bind_null)(sqlite3_stmt *p0, int p1);
int (*bind_parameter_count)(sqlite3_stmt *p0);
int (*bind_text)(sqlite3_stmt *p0, int p1, const char *p2, int p3,
void (*p4)(void *));
int (*busy_handler)(sqlite3 *p0, int (*p2)(void *, int), void *p3);
int (*changes)(sqlite3 *p0);
int (*close)(sqlite3 *p0);
const void * (*column_blob)(sqlite3_stmt *p0, int p1);
int (*column_bytes)(sqlite3_stmt *p0, int p1);
int (*column_count)(sqlite3_stmt *p0);
const char * (*column_database_name)(sqlite3_stmt *p0, int p1);
const char * (*column_decltype)(sqlite3_stmt *p0, int p1);
double (*column_double)(sqlite3_stmt *p0, int p1);
const char * (*column_name)(sqlite3_stmt *p0, int p1);
const char * (*column_origin_name)(sqlite3_stmt *p0, int p1);
const char * (*column_table_name)(sqlite3_stmt *p0, int p1);
const unsigned char * (*column_text)(sqlite3_stmt *p0, int p1);
int (*column_type)(sqlite3_stmt *p0, int p1);
int (*create_function)(sqlite3 *p0, const char *p1, int p2, int p3,
void *p4,
void (*p5)(sqlite3_context *, int, sqlite3_value **),
void (*p6)(sqlite3_context *, int, sqlite3_value **),
void (*p7)(sqlite3_context *));
int (*enable_load_extension)(sqlite3 *p0, int p1);
int (*errcode)(sqlite3 *p0);
const char * (*errmsg)(sqlite3 *p0);
int (*exec)(sqlite3 *p0, const char *p1,
int (*p2)(void *, int, char **, char **),
void *p3, char **p4);
int (*finalize)(sqlite3_stmt *p0);
void (*free)(void *p0);
void (*free_table)(char **p0);
int (*get_table)(sqlite3 *p0, const char *p1, char ***p2,
int *p3, int *p4, char **p5);
void (*interrupt)(sqlite3 *p0);
int (*key)(sqlite3 *p0, const void *p1, int p2);
sqlite_int64 (*last_insert_rowid)(sqlite3 *p0);
const char * (*libversion)(void);
int (*load_extension)(sqlite3 *p0, const char *p1, const char *p2,
char **p3);
void * (*malloc)(int p0);
char * (*mprintf)(const char *p0, ...);
int (*open)(const char *p0, sqlite3 **p1);
int (*open16)(const void *p0, sqlite3 **p1);
int (*open_v2)(const char *p0, sqlite3 **p1, int p2, const char *p3);
int (*prepare)(sqlite3 *p0, const char *p1, int p2, sqlite3_stmt **p3,
const char **p4);
int (*prepare_v2)(sqlite3 *p0, const char *p1, int p2, sqlite3_stmt **p3,
const char **p4);
void * (*profile)(sqlite3 *p0,
void (*p1)(void *, const char *, sqlite3_uint64),
void *p2);
void * (*realloc)(void *p0, int p1);
int (*rekey)(sqlite3 *p0, const void *p1, int p2);
int (*reset)(sqlite3_stmt *p0);
void (*result_blob)(sqlite3_context *p0, const void *p1,
int p2, void (*p3)(void *));
void (*result_error)(sqlite3_context *p0, const char *p1, int p2);
void (*result_int)(sqlite3_context *p0, int p1);
void (*result_null)(sqlite3_context *p0);
int (*step)(sqlite3_stmt *p0);
int (*xstrnicmp)(const char *p0, const char *p1, int p2);
int (*table_column_metadata)(sqlite3 *p0, const char *p1,
const char *p2, const char *p3,
char const **p4, char const **p5,
int *p6, int *p7, int *p8);
void * (*trace)(sqlite3 *p0, void (*p1)(void *, const char *), void *p2);
void * (*user_data)(sqlite3_context *p0);
const void * (*value_blob)(sqlite3_value *p0);
int (*value_bytes)(sqlite3_value *p0);
const unsigned char * (*value_text)(sqlite3_value *p0);
int (*value_type)(sqlite3_value *p0);
} dls_funcs;
#define sqlite3_activate_see dls_funcs.activate_see
#define sqlite3_bind_blob dls_funcs.bind_blob
#define sqlite3_bind_double dls_funcs.bind_double
#define sqlite3_bind_int dls_funcs.bind_int
#define sqlite3_bind_int64 dls_funcs.bind_int64
#define sqlite3_bind_null dls_funcs.bind_null
#define sqlite3_bind_parameter_count dls_funcs.bind_parameter_count
#define sqlite3_bind_text dls_funcs.bind_text
#define sqlite3_busy_handler dls_funcs.busy_handler
#define sqlite3_changes dls_funcs.changes
#define sqlite3_close dls_funcs.close
#define sqlite3_column_blob dls_funcs.column_blob
#define sqlite3_column_bytes dls_funcs.column_bytes
#define sqlite3_column_count dls_funcs.column_count
#define sqlite3_column_database_name dls_funcs.column_database_name
#define sqlite3_column_decltype dls_funcs.column_decltype
#define sqlite3_column_double dls_funcs.column_double
#define sqlite3_column_name dls_funcs.column_name
#define sqlite3_column_origin_name dls_funcs.column_origin_name
#define sqlite3_column_table_name dls_funcs.column_table_name
#define sqlite3_column_text dls_funcs.column_text
#define sqlite3_column_type dls_funcs.column_type
#define sqlite3_create_function dls_funcs.create_function
#define sqlite3_enable_load_extension dls_funcs.enable_load_extension
#define sqlite3_errcode dls_funcs.errcode
#define sqlite3_errmsg dls_funcs.errmsg
#define sqlite3_exec dls_funcs.exec
#define sqlite3_finalize dls_funcs.finalize
#define sqlite3_free dls_funcs.free
#define sqlite3_free_table dls_funcs.free_table
#define sqlite3_get_table dls_funcs.get_table
#define sqlite3_interrupt dls_funcs.interrupt
#define sqlite3_key dls_funcs.key
#define sqlite3_last_insert_rowid dls_funcs.last_insert_rowid
#define sqlite3_libversion dls_funcs.libversion
#define sqlite3_load_extension dls_funcs.load_extension
#define sqlite3_malloc dls_funcs.malloc
#define sqlite3_mprintf dls_funcs.mprintf
#define sqlite3_open dls_funcs.open
#define sqlite3_open16 dls_funcs.open16
#define sqlite3_open_v2 dls_funcs.open_v2
#define sqlite3_prepare dls_funcs.prepare
#define sqlite3_prepare_v2 dls_funcs.prepare_v2
#define sqlite3_profile dls_funcs.profile
#define sqlite3_realloc dls_funcs.realloc
#define sqlite3_rekey dls_funcs.rekey
#define sqlite3_reset dls_funcs.reset
#define sqlite3_result_blob dls_funcs.result_blob
#define sqlite3_result_error dls_funcs.result_error
#define sqlite3_result_int dls_funcs.result_int
#define sqlite3_result_null dls_funcs.result_null
#define sqlite3_step dls_funcs.step
#define sqlite3_strnicmp dls_funcs.xstrnicmp
#define sqlite3_table_column_metadata dls_funcs.table_column_metadata
#define sqlite3_trace dls_funcs.trace
#define sqlite3_user_data dls_funcs.user_data
#define sqlite3_value_blob dls_funcs.value_blob
#define sqlite3_value_bytes dls_funcs.value_bytes
#define sqlite3_value_text dls_funcs.value_text
#define sqlite3_value_type dls_funcs.value_type
#endif
#ifndef WITHOUT_WINTERFACE
#define WINTERFACE
#define WCHARSUPPORT
#endif
#if !defined(_WIN32) && !defined(_WIN64)
#if !defined(WCHARSUPPORT) && defined(HAVE_SQLWCHAR) && (HAVE_SQLWCHAR)
#define WCHARSUPPORT
#endif
#endif
#if defined(WINTERFACE)
#include <sqlucode.h>
#endif
#if defined(_WIN32) || defined(_WIN64)
#include "resource3.h"
#define ODBC_INI "ODBC.INI"
#ifndef DRIVER_VER_INFO
#define DRIVER_VER_INFO VERSION
#endif
#else
#define ODBC_INI ".odbc.ini"
#endif
#ifndef DRIVER_VER_INFO
#define DRIVER_VER_INFO "0.0"
#endif
#ifndef COLATTRIBUTE_LAST_ARG_TYPE
#ifdef _WIN64
#define COLATTRIBUTE_LAST_ARG_TYPE SQLLEN *
#else
#define COLATTRIBUTE_LAST_ARG_TYPE SQLPOINTER
#endif
#endif
#ifndef SETSTMTOPTION_LAST_ARG_TYPE
#define SETSTMTOPTION_LAST_ARG_TYPE SQLROWCOUNT
#endif
#undef min
#define min(a, b) ((a) < (b) ? (a) : (b))
#undef max
#define max(a, b) ((a) < (b) ? (b) : (a))
#ifndef PTRDIFF_T
#define PTRDIFF_T int
#endif
#define array_size(x) (sizeof (x) / sizeof (x[0]))
#define stringify1(s) #s
#define stringify(s) stringify1(s)
#define verinfo(maj, min, lev) ((maj) << 16 | (min) << 8 | (lev))
/* Column meta data from SQLite support */
#undef FULL_METADATA
#if defined(HAVE_SQLITE3TABLECOLUMNMETADATA) && (HAVE_SQLITE3TABLECOLUMNMETADATA)
#if defined(HAVE_SQLITE3COLUMNDATABASENAME) && (HAVE_SQLITE3COLUMNDATABASENAME)
#if defined(HAVE_SQLITE3COLUMNTABLENAME) && (HAVE_SQLITE3COLUMNTABLENAME)
#if defined(HAVE_SQLITE3COLUMNORIGINNAME) && (HAVE_SQLITE3COLUMNORIGINNAME)
#define FULL_METADATA 1
#endif
#endif
#endif
#endif
/* Column types for static string column descriptions (SQLTables etc.) */
#if defined(WINTERFACE) && !defined(_WIN32) && !defined(_WIN64)
#define SCOL_VARCHAR SQL_WVARCHAR
#define SCOL_CHAR SQL_WCHAR
#else
#define SCOL_VARCHAR SQL_VARCHAR
#define SCOL_CHAR SQL_CHAR
#endif
#define ENV_MAGIC 0x53544145
#define DBC_MAGIC 0x53544144
#define DEAD_MAGIC 0xdeadbeef
/**
* @typedef dstr
* @struct dstr
* Internal structure representing dynamic strings.
*/
typedef struct dstr {
int len; /**< Current length. */
int max; /**< Maximum length of buffer. */
int oom; /**< True when out of memory. */
char buffer[1]; /**< String buffer. */
} dstr;
static const char *xdigits = "0123456789ABCDEFabcdef";
#ifdef MEMORY_DEBUG
static void *
xmalloc_(int n, char *file, int line)
{
int nn = n + 4 * sizeof (long);
long *p;
p = malloc(nn);
if (!p) {
#if (MEMORY_DEBUG > 1)
fprintf(stderr, "malloc\t%d\tNULL\t%s:%d\n", n, file, line);
#endif
return NULL;
}
p[0] = 0xdead1234;
nn = nn / sizeof (long) - 1;
p[1] = n;
p[nn] = 0xdead5678;
#if (MEMORY_DEBUG > 1)
fprintf(stderr, "malloc\t%d\t%p\t%s:%d\n", n, &p[2], file, line);
#endif
return (void *) &p[2];
}
static void *
xrealloc_(void *old, int n, char *file, int line)
{
int nn = n + 4 * sizeof (long), nnn;
long *p, *pp;
if (n == 0 || !old) {
return xmalloc_(n, file, line);
}
p = &((long *) old)[-2];
if (p[0] != 0xdead1234) {
fprintf(stderr, "*** low end corruption @ %p\n", old);
abort();
}
nnn = p[1] + 4 * sizeof (long);
nnn = nnn / sizeof (long) - 1;
if (p[nnn] != 0xdead5678) {
fprintf(stderr, "*** high end corruption @ %p\n", old);
abort();
}
pp = realloc(p, nn);
if (!pp) {
#if (MEMORY_DEBUG > 1)
fprintf(stderr, "realloc\t%p,%d\tNULL\t%s:%d\n", old, n, file, line);
#endif
return NULL;
}
#if (MEMORY_DEBUG > 1)
fprintf(stderr, "realloc\t%p,%d\t%p\t%s:%d\n", old, n, &pp[2], file, line);
#endif
p = pp;
p[1] = n;
nn = nn / sizeof (long) - 1;
p[nn] = 0xdead5678;
return (void *) &p[2];
}
static void
xfree_(void *x, char *file, int line)
{
long *p;
int n;
if (!x) {
return;
}
p = &((long *) x)[-2];
if (p[0] != 0xdead1234) {
fprintf(stderr, "*** low end corruption @ %p\n", x);
abort();
}
n = p[1] + 4 * sizeof (long);
n = n / sizeof (long) - 1;
if (p[n] != 0xdead5678) {
fprintf(stderr, "*** high end corruption @ %p\n", x);
abort();
}
#if (MEMORY_DEBUG > 1)
fprintf(stderr, "free\t%p\t\t%s:%d\n", x, file, line);
#endif
free(p);
}
static void
xfree__(void *x)
{
xfree_(x, "unknown location", 0);
}
static char *
xstrdup_(const char *str, char *file, int line)
{
char *p;
if (!str) {
#if (MEMORY_DEBUG > 1)
fprintf(stderr, "strdup\tNULL\tNULL\t%s:%d\n", file, line);
#endif
return NULL;
}
p = xmalloc_(strlen(str) + 1, file, line);
if (p) {
strcpy(p, str);
}
#if (MEMORY_DEBUG > 1)
fprintf(stderr, "strdup\t%p\t%p\t%s:%d\n", str, p, file, line);
#endif
return p;
}
#define xmalloc(x) xmalloc_(x, __FILE__, __LINE__)
#define xrealloc(x,y) xrealloc_(x, y, __FILE__, __LINE__)
#define xfree(x) xfree_(x, __FILE__, __LINE__)
#define xstrdup(x) xstrdup_(x, __FILE__, __LINE__)
#else
#define xmalloc(x) sqlite3_malloc(x)
#define xrealloc(x,y) sqlite3_realloc(x, y)
#define xfree(x) sqlite3_free(x)
#define xstrdup(x) strdup_(x)
#endif
#if defined(_WIN32) || defined(_WIN64)
#define vsnprintf _vsnprintf
#define snprintf _snprintf
#define strcasecmp _stricmp
#define strncasecmp _strnicmp
#ifdef _MSC_VER
#define strtoll _strtoi64
#define strtoull _strtoui64
#endif
static HINSTANCE NEAR hModule; /* Saved module handle for resources */
#endif
#ifdef HAVE_SQLITE3STRNICMP
#undef strncasecmp
#define strncasecmp(A,B,C) sqlite3_strnicmp(A,B,C)
#undef strcasecmp
#define strcasecmp(A,B) strcasecmp_(A,B)
#if defined(__GNUC__) && (__GNUC__ >= 2)
static int strcasecmp_(const char *a, const char *b)
__attribute__((__unused__));
#endif
static int strcasecmp_(const char *a, const char *b)
{
int c = strlen(a), d = strlen(b);
if (c > d) {
return strncasecmp(a, b, c);
}
return strncasecmp(a, b, d);
}
#endif
#if defined(_WIN32) || defined(_WIN64)
/*
* SQLHENV, SQLHDBC, and SQLHSTMT synchronization
* is done using a critical section in ENV and DBC
* structures.
*/
#define HDBC_LOCK(hdbc) \
{ \
DBC *d; \
\
if ((hdbc) == SQL_NULL_HDBC) { \
return SQL_INVALID_HANDLE; \
} \
d = (DBC *) (hdbc); \
if (d->magic != DBC_MAGIC) { \
return SQL_INVALID_HANDLE; \
} \
EnterCriticalSection(&d->cs); \
d->owner = GetCurrentThreadId(); \
}
#define HDBC_UNLOCK(hdbc) \
if ((hdbc) != SQL_NULL_HDBC) { \
DBC *d; \
\
d = (DBC *) (hdbc); \
if (d->magic == DBC_MAGIC) { \
d->owner = 0; \
LeaveCriticalSection(&d->cs); \
} \
}
#define HSTMT_LOCK(hstmt) \
{ \
DBC *d; \
\
if ((hstmt) == SQL_NULL_HSTMT) { \
return SQL_INVALID_HANDLE; \
} \
d = (DBC *) ((STMT *) (hstmt))->dbc; \
if (d->magic != DBC_MAGIC) { \
return SQL_INVALID_HANDLE; \
} \
EnterCriticalSection(&d->cs); \
d->owner = GetCurrentThreadId(); \
}
#define HSTMT_UNLOCK(hstmt) \
if ((hstmt) != SQL_NULL_HSTMT) { \
DBC *d; \
\
d = (DBC *) ((STMT *) (hstmt))->dbc; \
if (d->magic == DBC_MAGIC) { \
d->owner = 0; \
LeaveCriticalSection(&d->cs); \
} \
}
#else
/*
* On UN*X assume that we are single-threaded or
* the driver manager provides serialization for us.
*
* In iODBC (3.52.x) serialization can be turned
* on using the DSN property "ThreadManager=yes".
*
* In unixODBC that property is named
* "Threading=0-3" and takes one of these values:
*
* 0 - no protection
* 1 - statement level protection
* 2 - connection level protection
* 3 - environment level protection
*
* unixODBC 2.2.11 uses environment level protection
* by default when it has been built with pthread
* support.
*/
#define HDBC_LOCK(hdbc)
#define HDBC_UNLOCK(hdbc)
#define HSTMT_LOCK(hdbc)
#define HSTMT_UNLOCK(hdbc)
#endif
#if defined(ENABLE_NVFS) && (ENABLE_NVFS)
extern void nvfs_init(void);
extern const char *nvfs_makevfs(const char *);
#endif
/*
* tolower() replacement w/o locale
*/
static const char upper_chars[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
static const char lower_chars[] = "abcdefghijklmnopqrstuvwxyz";
static int
TOLOWER(int c)
{
if (c) {
char *p = strchr(upper_chars, c);
if (p) {
c = lower_chars[p - upper_chars];
}
}
return c;
}
/*
* isdigit() replacement w/o ctype.h
*/
static const char digit_chars[] = "0123456789";
#define ISDIGIT(c) \
((c) && strchr(digit_chars, (c)) != NULL)
/*
* isspace() replacement w/o ctype.h
*/
static const char space_chars[] = " \f\n\r\t\v";
#define ISSPACE(c) \
((c) && strchr(space_chars, (c)) != NULL)
/*
* Forward declarations of static functions.
*/
static void dbtraceapi(DBC *d, char *fn, const char *sql);
static void freedyncols(STMT *s);
static void freeresult(STMT *s, int clrcols);
static void freerows(char **rowp);
static void unbindcols(STMT *s);
static void s3stmt_drop(STMT *s);
static SQLRETURN drvexecute(SQLHSTMT stmt, int initial);
static SQLRETURN freestmt(HSTMT stmt);
static SQLRETURN mkbindcols(STMT *s, int ncols);
static SQLRETURN setupdyncols(STMT *s, sqlite3_stmt *s3stmt, int *ncolsp);
static SQLRETURN setupparbuf(STMT *s, BINDPARM *p);
static SQLRETURN starttran(STMT *s);
static SQLRETURN setupparam(STMT *s, char *sql, int pnum);
static SQLRETURN getrowdata(STMT *s, SQLUSMALLINT col, SQLSMALLINT otype,
SQLPOINTER val, SQLINTEGER len, SQLLEN *lenp,
int partial);
#if (defined(_WIN32) || defined(_WIN64)) && defined(WINTERFACE)
/* MS Access hack part 1 (reserved error -7748) */
static COL *statSpec2P, *statSpec3P;
#endif
#if (MEMORY_DEBUG < 1)
/**
* Duplicate string using xmalloc().
* @param str string to be duplicated
* @result pointer to new string or NULL
*/
static char *
strdup_(const char *str)
{
char *p = NULL;
if (str) {
p = xmalloc(strlen(str) + 1);
if (p) {
strcpy(p, str);
}
}
return p;
}
#endif
/**
* Append string to dynamic string.
* @param dsp dstr pointer
* @param str string to append
* @result dsp result dstr pointer or NULL.
*/
static dstr *
dsappend(dstr *dsp, const char *str)
{
int len;
if (!str) {
return dsp;
}
len = strlen(str);
if (!dsp) {
int max = 256;
if (max < len) {
max += len;
}
dsp = xmalloc(max + sizeof (*dsp));
if (dsp) {
dsp->max = max;
dsp->len = dsp->oom = 0;
goto copy;
}
return dsp;
}
if (dsp->oom) {
return dsp;
}
if (dsp->len + len > dsp->max) {
int max = dsp->max + len + 256;
dstr *ndsp = xrealloc(dsp, max + sizeof (*dsp));
if (!ndsp) {
strcpy(dsp->buffer, "OUT OF MEMORY");
dsp->max = dsp->len = 13;
dsp->oom = 1;
return dsp;
}
dsp = ndsp;
dsp->max = max;
}
copy:
strcpy(dsp->buffer + dsp->len, str);
dsp->len += len;
return dsp;
}
/**
* Append a string double quoted to dynamic string.
* @param dsp dstr pointer
* @param str string to append
* @result dsp result dstr pointer or NULL.
*/
static dstr *
dsappendq(dstr *dsp, const char *str)
{
int len;
const char *p;
char *q;
if (!str) {
return dsp;
}
len = strlen(str);
for (p = str; *p; ++p) {
if (p[0] == '"') {
++len;
}
}
len += 2;
if (!dsp) {
int max = 256;
if (max < len) {
max += len;
}
dsp = xmalloc(max + sizeof (*dsp));
if (dsp) {
dsp->max = max;
dsp->len = dsp->oom = 0;
goto copy;
}
return dsp;
}
if (dsp->oom) {
return dsp;
}
if (dsp->len + len > dsp->max) {
int max = dsp->max + len + 256;
dstr *ndsp = xrealloc(dsp, max + sizeof (*dsp));
if (!ndsp) {
strcpy(dsp->buffer, "OUT OF MEMORY");
dsp->max = dsp->len = 13;
dsp->oom = 1;
return dsp;
}
dsp = ndsp;
dsp->max = max;
}
copy:
q = dsp->buffer + dsp->len;
*q++ = '"';
for (p = str; *p; ++p) {
*q++ = *p;
if (p[0] == '"') {
*q++ = '"';
}
}
*q++ = '"';
*q = '\0';
dsp->len += len;
return dsp;
}
/**
* Return dynamic string's value.
* @param dsp dstr pointer
* @result string value
*/
static const char *
dsval(dstr *dsp)
{
if (dsp) {
return (const char *) dsp->buffer;
}
return "ERROR";
}
/**
* Check error on dynamic string.
* @param dsp dstr pointer
* @result true when error pending
*/
static int
dserr(dstr *dsp)
{
return !dsp || dsp->oom;
}
/**
* Free dynamic string.
* @param dsp dstr pointer
*/
static void
dsfree(dstr *dsp)
{
if (dsp) {
xfree(dsp);
}
}
#ifdef WCHARSUPPORT
/**
* Return length of UNICODE string.
* @param str UNICODE string
* @result length of string in characters
*/
static int
uc_strlen(SQLWCHAR *str)
{
int len = 0;
if (str) {
while (*str) {
++len;
++str;
}
}
return len;
}
/**
* Copy UNICODE string like strncpy().
* @param dest destination area
* @param src source area
* @param len length of source area in characters
* @return pointer to destination area
*/
static SQLWCHAR *
uc_strncpy(SQLWCHAR *dest, SQLWCHAR *src, int len)
{
int i = 0;
while (i < len) {
if (!src[i]) {
break;
}
dest[i] = src[i];
++i;
}
if (i < len) {
dest[i] = 0;
}
return dest;
}
/**
* Make UNICODE string from UTF8 string into buffer.
* @param str UTF8 string to be converted
* @param len length in characters of str or -1
* @param uc destination area to receive UNICODE string
* @param ucLen byte length of destination area
*/
static void
uc_from_utf_buf(unsigned char *str, int len, SQLWCHAR *uc, int ucLen)
{
ucLen = ucLen / sizeof (SQLWCHAR);
if (!uc || ucLen < 0) {
return;
}
if (len < 0) {
len = ucLen * 5;
}
uc[0] = 0;
if (str) {
int i = 0;
while (i < len && *str && i < ucLen) {
unsigned char c = str[0];
if (c < 0x80) {
uc[i++] = c;
++str;
} else if (c <= 0xc1 || c >= 0xf5) {
/* illegal, ignored */
++str;
} else if (c < 0xe0) {
if ((str[1] & 0xc0) == 0x80) {
unsigned long t = ((c & 0x1f) << 6) | (str[1] & 0x3f);
uc[i++] = t;
str += 2;
} else {
uc[i++] = c;
++str;
}
} else if (c < 0xf0) {
if ((str[1] & 0xc0) == 0x80 && (str[2] & 0xc0) == 0x80) {
unsigned long t = ((c & 0x0f) << 12) |
((str[1] & 0x3f) << 6) | (str[2] & 0x3f);
uc[i++] = t;
str += 3;
} else {
uc[i++] = c;
++str;
}
} else if (c < 0xf8) {
if ((str[1] & 0xc0) == 0x80 && (str[2] & 0xc0) == 0x80 &&
(str[3] & 0xc0) == 0x80) {
unsigned long t = ((c & 0x03) << 18) |
((str[1] & 0x3f) << 12) | ((str[2] & 0x3f) << 6) |
(str[3] & 0x3f);
if (sizeof (SQLWCHAR) == 2 * sizeof (char) &&
t >= 0x10000) {
t -= 0x10000;
uc[i++] = 0xd800 | ((t >> 10) & 0x3ff);
if (i >= ucLen) {
break;
}
t = 0xdc00 | (t & 0x3ff);
}
uc[i++] = t;
str += 4;
} else {
uc[i++] = c;
++str;
}
} else {
/* ignore */
++str;
}
}
if (i < ucLen) {
uc[i] = 0;
}
}
}
/**
* Make UNICODE string from UTF8 string.
* @param str UTF8 string to be converted
* @param len length of UTF8 string
* @return alloc'ed UNICODE string to be free'd by uc_free()
*/
static SQLWCHAR *
uc_from_utf(unsigned char *str, int len)
{
SQLWCHAR *uc = NULL;
int ucLen;
if (str) {
if (len == SQL_NTS) {
len = strlen((char *) str);
}
ucLen = sizeof (SQLWCHAR) * (len + 1);
uc = xmalloc(ucLen);
if (uc) {
uc_from_utf_buf(str, len, uc, ucLen);
}
}
return uc;
}
/**
* Make UTF8 string from UNICODE string.
* @param str UNICODE string to be converted
* @param len length of UNICODE string in bytes
* @return alloc'ed UTF8 string to be free'd by uc_free()
*/
static char *
uc_to_utf(SQLWCHAR *str, int len)
{
int i;
char *cp, *ret = NULL;
if (!str) {
return ret;
}
if (len == SQL_NTS) {
len = uc_strlen(str);
} else {
len = len / sizeof (SQLWCHAR);
}
cp = xmalloc(len * 6 + 1);
if (!cp) {
return ret;
}
ret = cp;
for (i = 0; i < len; i++) {
unsigned long c = str[i];
if (sizeof (SQLWCHAR) == 2 * sizeof (char)) {
c &= 0xffff;
}
if (c < 0x80) {
*cp++ = c;
} else if (c < 0x800) {
*cp++ = 0xc0 | ((c >> 6) & 0x1f);
*cp++ = 0x80 | (c & 0x3f);
} else if (c < 0x10000) {
if (sizeof (SQLWCHAR) == 2 * sizeof (char) &&
c >= 0xd800 && c <= 0xdbff && i + 1 < len) {
unsigned long c2 = str[i + 1] & 0xffff;
if (c2 >= 0xdc00 && c2 <= 0xdfff) {
c = (((c & 0x3ff) << 10) | (c2 & 0x3ff)) + 0x10000;
*cp++ = 0xf0 | ((c >> 18) & 0x07);
*cp++ = 0x80 | ((c >> 12) & 0x3f);
*cp++ = 0x80 | ((c >> 6) & 0x3f);
*cp++ = 0x80 | (c & 0x3f);
++i;
continue;
}