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shell.c.in
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shell.c.in
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/*
** 2001 September 15
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
*************************************************************************
** This file contains code to implement the "sqlite" command line
** utility for accessing SQLite databases.
*/
#if (defined(_WIN32) || defined(WIN32)) && !defined(_CRT_SECURE_NO_WARNINGS)
/* This needs to come before any includes for MSVC compiler */
#define _CRT_SECURE_NO_WARNINGS
#endif
/*
** Determine if we are dealing with WinRT, which provides only a subset of
** the full Win32 API.
*/
#if !defined(SQLITE_OS_WINRT)
# define SQLITE_OS_WINRT 0
#endif
/*
** Warning pragmas copied from msvc.h in the core.
*/
#if defined(_MSC_VER)
#pragma warning(disable : 4054)
#pragma warning(disable : 4055)
#pragma warning(disable : 4100)
#pragma warning(disable : 4127)
#pragma warning(disable : 4130)
#pragma warning(disable : 4152)
#pragma warning(disable : 4189)
#pragma warning(disable : 4206)
#pragma warning(disable : 4210)
#pragma warning(disable : 4232)
#pragma warning(disable : 4244)
#pragma warning(disable : 4305)
#pragma warning(disable : 4306)
#pragma warning(disable : 4702)
#pragma warning(disable : 4706)
#endif /* defined(_MSC_VER) */
/*
** No support for loadable extensions in VxWorks.
*/
#if (defined(__RTP__) || defined(_WRS_KERNEL)) && !SQLITE_OMIT_LOAD_EXTENSION
# define SQLITE_OMIT_LOAD_EXTENSION 1
#endif
/*
** Enable large-file support for fopen() and friends on unix.
*/
#ifndef SQLITE_DISABLE_LFS
# define _LARGE_FILE 1
# ifndef _FILE_OFFSET_BITS
# define _FILE_OFFSET_BITS 64
# endif
# define _LARGEFILE_SOURCE 1
#endif
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <assert.h>
#include "sqlite3.h"
typedef sqlite3_int64 i64;
typedef sqlite3_uint64 u64;
typedef unsigned char u8;
#if SQLITE_USER_AUTHENTICATION
# include "sqlite3userauth.h"
#endif
#include <ctype.h>
#include <stdarg.h>
#if !defined(_WIN32) && !defined(WIN32)
# include <signal.h>
# if !defined(__RTP__) && !defined(_WRS_KERNEL)
# include <pwd.h>
# endif
#endif
#if (!defined(_WIN32) && !defined(WIN32)) || defined(__MINGW32__)
# include <unistd.h>
# include <dirent.h>
# define GETPID getpid
# if defined(__MINGW32__)
# define DIRENT dirent
# ifndef S_ISLNK
# define S_ISLNK(mode) (0)
# endif
# endif
#else
# define GETPID (int)GetCurrentProcessId
#endif
#include <sys/types.h>
#include <sys/stat.h>
#if HAVE_READLINE
# include <readline/readline.h>
# include <readline/history.h>
#endif
#if HAVE_EDITLINE
# include <editline/readline.h>
#endif
#if HAVE_EDITLINE || HAVE_READLINE
# define shell_add_history(X) add_history(X)
# define shell_read_history(X) read_history(X)
# define shell_write_history(X) write_history(X)
# define shell_stifle_history(X) stifle_history(X)
# define shell_readline(X) readline(X)
#elif HAVE_LINENOISE
# include "linenoise.h"
# define shell_add_history(X) linenoiseHistoryAdd(X)
# define shell_read_history(X) linenoiseHistoryLoad(X)
# define shell_write_history(X) linenoiseHistorySave(X)
# define shell_stifle_history(X) linenoiseHistorySetMaxLen(X)
# define shell_readline(X) linenoise(X)
#else
# define shell_read_history(X)
# define shell_write_history(X)
# define shell_stifle_history(X)
# define SHELL_USE_LOCAL_GETLINE 1
#endif
#if defined(_WIN32) || defined(WIN32)
# if SQLITE_OS_WINRT
# define SQLITE_OMIT_POPEN 1
# else
# include <io.h>
# include <fcntl.h>
# define isatty(h) _isatty(h)
# ifndef access
# define access(f,m) _access((f),(m))
# endif
# ifndef unlink
# define unlink _unlink
# endif
# ifndef strdup
# define strdup _strdup
# endif
# undef popen
# define popen _popen
# undef pclose
# define pclose _pclose
# endif
#else
/* Make sure isatty() has a prototype. */
extern int isatty(int);
# if !defined(__RTP__) && !defined(_WRS_KERNEL)
/* popen and pclose are not C89 functions and so are
** sometimes omitted from the <stdio.h> header */
extern FILE *popen(const char*,const char*);
extern int pclose(FILE*);
# else
# define SQLITE_OMIT_POPEN 1
# endif
#endif
#if defined(_WIN32_WCE)
/* Windows CE (arm-wince-mingw32ce-gcc) does not provide isatty()
* thus we always assume that we have a console. That can be
* overridden with the -batch command line option.
*/
#define isatty(x) 1
#endif
/* ctype macros that work with signed characters */
#define IsSpace(X) isspace((unsigned char)X)
#define IsDigit(X) isdigit((unsigned char)X)
#define ToLower(X) (char)tolower((unsigned char)X)
#if defined(_WIN32) || defined(WIN32)
#if SQLITE_OS_WINRT
#include <intrin.h>
#endif
#include <windows.h>
/* string conversion routines only needed on Win32 */
extern char *sqlite3_win32_unicode_to_utf8(LPCWSTR);
extern char *sqlite3_win32_mbcs_to_utf8_v2(const char *, int);
extern char *sqlite3_win32_utf8_to_mbcs_v2(const char *, int);
extern LPWSTR sqlite3_win32_utf8_to_unicode(const char *zText);
#endif
/* On Windows, we normally run with output mode of TEXT so that \n characters
** are automatically translated into \r\n. However, this behavior needs
** to be disabled in some cases (ex: when generating CSV output and when
** rendering quoted strings that contain \n characters). The following
** routines take care of that.
*/
#if (defined(_WIN32) || defined(WIN32)) && !SQLITE_OS_WINRT
static void setBinaryMode(FILE *file, int isOutput){
if( isOutput ) fflush(file);
_setmode(_fileno(file), _O_BINARY);
}
static void setTextMode(FILE *file, int isOutput){
if( isOutput ) fflush(file);
_setmode(_fileno(file), _O_TEXT);
}
#else
# define setBinaryMode(X,Y)
# define setTextMode(X,Y)
#endif
/* True if the timer is enabled */
static int enableTimer = 0;
/* Return the current wall-clock time */
static sqlite3_int64 timeOfDay(void){
static sqlite3_vfs *clockVfs = 0;
sqlite3_int64 t;
if( clockVfs==0 ) clockVfs = sqlite3_vfs_find(0);
if( clockVfs->iVersion>=2 && clockVfs->xCurrentTimeInt64!=0 ){
clockVfs->xCurrentTimeInt64(clockVfs, &t);
}else{
double r;
clockVfs->xCurrentTime(clockVfs, &r);
t = (sqlite3_int64)(r*86400000.0);
}
return t;
}
#if !defined(_WIN32) && !defined(WIN32) && !defined(__minux)
#include <sys/time.h>
#include <sys/resource.h>
/* VxWorks does not support getrusage() as far as we can determine */
#if defined(_WRS_KERNEL) || defined(__RTP__)
struct rusage {
struct timeval ru_utime; /* user CPU time used */
struct timeval ru_stime; /* system CPU time used */
};
#define getrusage(A,B) memset(B,0,sizeof(*B))
#endif
/* Saved resource information for the beginning of an operation */
static struct rusage sBegin; /* CPU time at start */
static sqlite3_int64 iBegin; /* Wall-clock time at start */
/*
** Begin timing an operation
*/
static void beginTimer(void){
if( enableTimer ){
getrusage(RUSAGE_SELF, &sBegin);
iBegin = timeOfDay();
}
}
/* Return the difference of two time_structs in seconds */
static double timeDiff(struct timeval *pStart, struct timeval *pEnd){
return (pEnd->tv_usec - pStart->tv_usec)*0.000001 +
(double)(pEnd->tv_sec - pStart->tv_sec);
}
/*
** Print the timing results.
*/
static void endTimer(void){
if( enableTimer ){
sqlite3_int64 iEnd = timeOfDay();
struct rusage sEnd;
getrusage(RUSAGE_SELF, &sEnd);
printf("Run Time: real %.3f user %f sys %f\n",
(iEnd - iBegin)*0.001,
timeDiff(&sBegin.ru_utime, &sEnd.ru_utime),
timeDiff(&sBegin.ru_stime, &sEnd.ru_stime));
}
}
#define BEGIN_TIMER beginTimer()
#define END_TIMER endTimer()
#define HAS_TIMER 1
#elif (defined(_WIN32) || defined(WIN32))
/* Saved resource information for the beginning of an operation */
static HANDLE hProcess;
static FILETIME ftKernelBegin;
static FILETIME ftUserBegin;
static sqlite3_int64 ftWallBegin;
typedef BOOL (WINAPI *GETPROCTIMES)(HANDLE, LPFILETIME, LPFILETIME,
LPFILETIME, LPFILETIME);
static GETPROCTIMES getProcessTimesAddr = NULL;
/*
** Check to see if we have timer support. Return 1 if necessary
** support found (or found previously).
*/
static int hasTimer(void){
if( getProcessTimesAddr ){
return 1;
} else {
#if !SQLITE_OS_WINRT
/* GetProcessTimes() isn't supported in WIN95 and some other Windows
** versions. See if the version we are running on has it, and if it
** does, save off a pointer to it and the current process handle.
*/
hProcess = GetCurrentProcess();
if( hProcess ){
HINSTANCE hinstLib = LoadLibrary(TEXT("Kernel32.dll"));
if( NULL != hinstLib ){
getProcessTimesAddr =
(GETPROCTIMES) GetProcAddress(hinstLib, "GetProcessTimes");
if( NULL != getProcessTimesAddr ){
return 1;
}
FreeLibrary(hinstLib);
}
}
#endif
}
return 0;
}
/*
** Begin timing an operation
*/
static void beginTimer(void){
if( enableTimer && getProcessTimesAddr ){
FILETIME ftCreation, ftExit;
getProcessTimesAddr(hProcess,&ftCreation,&ftExit,
&ftKernelBegin,&ftUserBegin);
ftWallBegin = timeOfDay();
}
}
/* Return the difference of two FILETIME structs in seconds */
static double timeDiff(FILETIME *pStart, FILETIME *pEnd){
sqlite_int64 i64Start = *((sqlite_int64 *) pStart);
sqlite_int64 i64End = *((sqlite_int64 *) pEnd);
return (double) ((i64End - i64Start) / 10000000.0);
}
/*
** Print the timing results.
*/
static void endTimer(void){
if( enableTimer && getProcessTimesAddr){
FILETIME ftCreation, ftExit, ftKernelEnd, ftUserEnd;
sqlite3_int64 ftWallEnd = timeOfDay();
getProcessTimesAddr(hProcess,&ftCreation,&ftExit,&ftKernelEnd,&ftUserEnd);
printf("Run Time: real %.3f user %f sys %f\n",
(ftWallEnd - ftWallBegin)*0.001,
timeDiff(&ftUserBegin, &ftUserEnd),
timeDiff(&ftKernelBegin, &ftKernelEnd));
}
}
#define BEGIN_TIMER beginTimer()
#define END_TIMER endTimer()
#define HAS_TIMER hasTimer()
#else
#define BEGIN_TIMER
#define END_TIMER
#define HAS_TIMER 0
#endif
/*
** Used to prevent warnings about unused parameters
*/
#define UNUSED_PARAMETER(x) (void)(x)
/*
** Number of elements in an array
*/
#define ArraySize(X) (int)(sizeof(X)/sizeof(X[0]))
/*
** If the following flag is set, then command execution stops
** at an error if we are not interactive.
*/
static int bail_on_error = 0;
/*
** Threat stdin as an interactive input if the following variable
** is true. Otherwise, assume stdin is connected to a file or pipe.
*/
static int stdin_is_interactive = 1;
/*
** On Windows systems we have to know if standard output is a console
** in order to translate UTF-8 into MBCS. The following variable is
** true if translation is required.
*/
static int stdout_is_console = 1;
/*
** The following is the open SQLite database. We make a pointer
** to this database a static variable so that it can be accessed
** by the SIGINT handler to interrupt database processing.
*/
static sqlite3 *globalDb = 0;
/*
** True if an interrupt (Control-C) has been received.
*/
static volatile int seenInterrupt = 0;
#ifdef SQLITE_DEBUG
/*
** Out-of-memory simulator variables
*/
static unsigned int oomCounter = 0; /* Simulate OOM when equals 1 */
static unsigned int oomRepeat = 0; /* Number of OOMs in a row */
static void*(*defaultMalloc)(int) = 0; /* The low-level malloc routine */
#endif /* SQLITE_DEBUG */
/*
** This is the name of our program. It is set in main(), used
** in a number of other places, mostly for error messages.
*/
static char *Argv0;
/*
** Prompt strings. Initialized in main. Settable with
** .prompt main continue
*/
static char mainPrompt[20]; /* First line prompt. default: "sqlite> "*/
static char continuePrompt[20]; /* Continuation prompt. default: " ...> " */
/*
** Render output like fprintf(). Except, if the output is going to the
** console and if this is running on a Windows machine, translate the
** output from UTF-8 into MBCS.
*/
#if defined(_WIN32) || defined(WIN32)
void utf8_printf(FILE *out, const char *zFormat, ...){
va_list ap;
va_start(ap, zFormat);
if( stdout_is_console && (out==stdout || out==stderr) ){
char *z1 = sqlite3_vmprintf(zFormat, ap);
char *z2 = sqlite3_win32_utf8_to_mbcs_v2(z1, 0);
sqlite3_free(z1);
fputs(z2, out);
sqlite3_free(z2);
}else{
vfprintf(out, zFormat, ap);
}
va_end(ap);
}
#elif !defined(utf8_printf)
# define utf8_printf fprintf
#endif
/*
** Render output like fprintf(). This should not be used on anything that
** includes string formatting (e.g. "%s").
*/
#if !defined(raw_printf)
# define raw_printf fprintf
#endif
/* Indicate out-of-memory and exit. */
static void shell_out_of_memory(void){
raw_printf(stderr,"Error: out of memory\n");
exit(1);
}
#ifdef SQLITE_DEBUG
/* This routine is called when a simulated OOM occurs. It is broken
** out as a separate routine to make it easy to set a breakpoint on
** the OOM
*/
void shellOomFault(void){
if( oomRepeat>0 ){
oomRepeat--;
}else{
oomCounter--;
}
}
#endif /* SQLITE_DEBUG */
#ifdef SQLITE_DEBUG
/* This routine is a replacement malloc() that is used to simulate
** Out-Of-Memory (OOM) errors for testing purposes.
*/
static void *oomMalloc(int nByte){
if( oomCounter ){
if( oomCounter==1 ){
shellOomFault();
return 0;
}else{
oomCounter--;
}
}
return defaultMalloc(nByte);
}
#endif /* SQLITE_DEBUG */
#ifdef SQLITE_DEBUG
/* Register the OOM simulator. This must occur before any memory
** allocations */
static void registerOomSimulator(void){
sqlite3_mem_methods mem;
sqlite3_config(SQLITE_CONFIG_GETMALLOC, &mem);
defaultMalloc = mem.xMalloc;
mem.xMalloc = oomMalloc;
sqlite3_config(SQLITE_CONFIG_MALLOC, &mem);
}
#endif
/*
** Write I/O traces to the following stream.
*/
#ifdef SQLITE_ENABLE_IOTRACE
static FILE *iotrace = 0;
#endif
/*
** This routine works like printf in that its first argument is a
** format string and subsequent arguments are values to be substituted
** in place of % fields. The result of formatting this string
** is written to iotrace.
*/
#ifdef SQLITE_ENABLE_IOTRACE
static void SQLITE_CDECL iotracePrintf(const char *zFormat, ...){
va_list ap;
char *z;
if( iotrace==0 ) return;
va_start(ap, zFormat);
z = sqlite3_vmprintf(zFormat, ap);
va_end(ap);
utf8_printf(iotrace, "%s", z);
sqlite3_free(z);
}
#endif
/*
** Output string zUtf to stream pOut as w characters. If w is negative,
** then right-justify the text. W is the width in UTF-8 characters, not
** in bytes. This is different from the %*.*s specification in printf
** since with %*.*s the width is measured in bytes, not characters.
*/
static void utf8_width_print(FILE *pOut, int w, const char *zUtf){
int i;
int n;
int aw = w<0 ? -w : w;
for(i=n=0; zUtf[i]; i++){
if( (zUtf[i]&0xc0)!=0x80 ){
n++;
if( n==aw ){
do{ i++; }while( (zUtf[i]&0xc0)==0x80 );
break;
}
}
}
if( n>=aw ){
utf8_printf(pOut, "%.*s", i, zUtf);
}else if( w<0 ){
utf8_printf(pOut, "%*s%s", aw-n, "", zUtf);
}else{
utf8_printf(pOut, "%s%*s", zUtf, aw-n, "");
}
}
/*
** Determines if a string is a number of not.
*/
static int isNumber(const char *z, int *realnum){
if( *z=='-' || *z=='+' ) z++;
if( !IsDigit(*z) ){
return 0;
}
z++;
if( realnum ) *realnum = 0;
while( IsDigit(*z) ){ z++; }
if( *z=='.' ){
z++;
if( !IsDigit(*z) ) return 0;
while( IsDigit(*z) ){ z++; }
if( realnum ) *realnum = 1;
}
if( *z=='e' || *z=='E' ){
z++;
if( *z=='+' || *z=='-' ) z++;
if( !IsDigit(*z) ) return 0;
while( IsDigit(*z) ){ z++; }
if( realnum ) *realnum = 1;
}
return *z==0;
}
/*
** Compute a string length that is limited to what can be stored in
** lower 30 bits of a 32-bit signed integer.
*/
static int strlen30(const char *z){
const char *z2 = z;
while( *z2 ){ z2++; }
return 0x3fffffff & (int)(z2 - z);
}
/*
** Return the length of a string in characters. Multibyte UTF8 characters
** count as a single character.
*/
static int strlenChar(const char *z){
int n = 0;
while( *z ){
if( (0xc0&*(z++))!=0x80 ) n++;
}
return n;
}
/*
** Return true if zFile does not exist or if it is not an ordinary file.
*/
#ifdef _WIN32
# define notNormalFile(X) 0
#else
static int notNormalFile(const char *zFile){
struct stat x;
int rc;
memset(&x, 0, sizeof(x));
rc = stat(zFile, &x);
return rc || !S_ISREG(x.st_mode);
}
#endif
/*
** This routine reads a line of text from FILE in, stores
** the text in memory obtained from malloc() and returns a pointer
** to the text. NULL is returned at end of file, or if malloc()
** fails.
**
** If zLine is not NULL then it is a malloced buffer returned from
** a previous call to this routine that may be reused.
*/
static char *local_getline(char *zLine, FILE *in){
int nLine = zLine==0 ? 0 : 100;
int n = 0;
while( 1 ){
if( n+100>nLine ){
nLine = nLine*2 + 100;
zLine = realloc(zLine, nLine);
if( zLine==0 ) shell_out_of_memory();
}
if( fgets(&zLine[n], nLine - n, in)==0 ){
if( n==0 ){
free(zLine);
return 0;
}
zLine[n] = 0;
break;
}
while( zLine[n] ) n++;
if( n>0 && zLine[n-1]=='\n' ){
n--;
if( n>0 && zLine[n-1]=='\r' ) n--;
zLine[n] = 0;
break;
}
}
#if defined(_WIN32) || defined(WIN32)
/* For interactive input on Windows systems, translate the
** multi-byte characterset characters into UTF-8. */
if( stdin_is_interactive && in==stdin ){
char *zTrans = sqlite3_win32_mbcs_to_utf8_v2(zLine, 0);
if( zTrans ){
int nTrans = strlen30(zTrans)+1;
if( nTrans>nLine ){
zLine = realloc(zLine, nTrans);
if( zLine==0 ) shell_out_of_memory();
}
memcpy(zLine, zTrans, nTrans);
sqlite3_free(zTrans);
}
}
#endif /* defined(_WIN32) || defined(WIN32) */
return zLine;
}
/*
** Retrieve a single line of input text.
**
** If in==0 then read from standard input and prompt before each line.
** If isContinuation is true, then a continuation prompt is appropriate.
** If isContinuation is zero, then the main prompt should be used.
**
** If zPrior is not NULL then it is a buffer from a prior call to this
** routine that can be reused.
**
** The result is stored in space obtained from malloc() and must either
** be freed by the caller or else passed back into this routine via the
** zPrior argument for reuse.
*/
static char *one_input_line(FILE *in, char *zPrior, int isContinuation){
char *zPrompt;
char *zResult;
if( in!=0 ){
zResult = local_getline(zPrior, in);
}else{
zPrompt = isContinuation ? continuePrompt : mainPrompt;
#if SHELL_USE_LOCAL_GETLINE
printf("%s", zPrompt);
fflush(stdout);
zResult = local_getline(zPrior, stdin);
#else
free(zPrior);
zResult = shell_readline(zPrompt);
if( zResult && *zResult ) shell_add_history(zResult);
#endif
}
return zResult;
}
/*
** Return the value of a hexadecimal digit. Return -1 if the input
** is not a hex digit.
*/
static int hexDigitValue(char c){
if( c>='0' && c<='9' ) return c - '0';
if( c>='a' && c<='f' ) return c - 'a' + 10;
if( c>='A' && c<='F' ) return c - 'A' + 10;
return -1;
}
/*
** Interpret zArg as an integer value, possibly with suffixes.
*/
static sqlite3_int64 integerValue(const char *zArg){
sqlite3_int64 v = 0;
static const struct { char *zSuffix; int iMult; } aMult[] = {
{ "KiB", 1024 },
{ "MiB", 1024*1024 },
{ "GiB", 1024*1024*1024 },
{ "KB", 1000 },
{ "MB", 1000000 },
{ "GB", 1000000000 },
{ "K", 1000 },
{ "M", 1000000 },
{ "G", 1000000000 },
};
int i;
int isNeg = 0;
if( zArg[0]=='-' ){
isNeg = 1;
zArg++;
}else if( zArg[0]=='+' ){
zArg++;
}
if( zArg[0]=='0' && zArg[1]=='x' ){
int x;
zArg += 2;
while( (x = hexDigitValue(zArg[0]))>=0 ){
v = (v<<4) + x;
zArg++;
}
}else{
while( IsDigit(zArg[0]) ){
v = v*10 + zArg[0] - '0';
zArg++;
}
}
for(i=0; i<ArraySize(aMult); i++){
if( sqlite3_stricmp(aMult[i].zSuffix, zArg)==0 ){
v *= aMult[i].iMult;
break;
}
}
return isNeg? -v : v;
}
/*
** A variable length string to which one can append text.
*/
typedef struct ShellText ShellText;
struct ShellText {
char *z;
int n;
int nAlloc;
};
/*
** Initialize and destroy a ShellText object
*/
static void initText(ShellText *p){
memset(p, 0, sizeof(*p));
}
static void freeText(ShellText *p){
free(p->z);
initText(p);
}
/* zIn is either a pointer to a NULL-terminated string in memory obtained
** from malloc(), or a NULL pointer. The string pointed to by zAppend is
** added to zIn, and the result returned in memory obtained from malloc().
** zIn, if it was not NULL, is freed.
**
** If the third argument, quote, is not '\0', then it is used as a
** quote character for zAppend.
*/
static void appendText(ShellText *p, char const *zAppend, char quote){
int len;
int i;
int nAppend = strlen30(zAppend);
len = nAppend+p->n+1;
if( quote ){
len += 2;
for(i=0; i<nAppend; i++){
if( zAppend[i]==quote ) len++;
}
}
if( p->n+len>=p->nAlloc ){
p->nAlloc = p->nAlloc*2 + len + 20;
p->z = realloc(p->z, p->nAlloc);
if( p->z==0 ) shell_out_of_memory();
}
if( quote ){
char *zCsr = p->z+p->n;
*zCsr++ = quote;
for(i=0; i<nAppend; i++){
*zCsr++ = zAppend[i];
if( zAppend[i]==quote ) *zCsr++ = quote;
}
*zCsr++ = quote;
p->n = (int)(zCsr - p->z);
*zCsr = '\0';
}else{
memcpy(p->z+p->n, zAppend, nAppend);
p->n += nAppend;
p->z[p->n] = '\0';
}
}
/*
** Attempt to determine if identifier zName needs to be quoted, either
** because it contains non-alphanumeric characters, or because it is an
** SQLite keyword. Be conservative in this estimate: When in doubt assume
** that quoting is required.
**
** Return '"' if quoting is required. Return 0 if no quoting is required.
*/
static char quoteChar(const char *zName){
int i;
if( !isalpha((unsigned char)zName[0]) && zName[0]!='_' ) return '"';
for(i=0; zName[i]; i++){
if( !isalnum((unsigned char)zName[i]) && zName[i]!='_' ) return '"';
}
return sqlite3_keyword_check(zName, i) ? '"' : 0;
}
/*
** Construct a fake object name and column list to describe the structure
** of the view, virtual table, or table valued function zSchema.zName.
*/
static char *shellFakeSchema(
sqlite3 *db, /* The database connection containing the vtab */
const char *zSchema, /* Schema of the database holding the vtab */
const char *zName /* The name of the virtual table */
){
sqlite3_stmt *pStmt = 0;
char *zSql;
ShellText s;
char cQuote;
char *zDiv = "(";
int nRow = 0;
zSql = sqlite3_mprintf("PRAGMA \"%w\".table_info=%Q;",
zSchema ? zSchema : "main", zName);
sqlite3_prepare_v2(db, zSql, -1, &pStmt, 0);
sqlite3_free(zSql);
initText(&s);
if( zSchema ){
cQuote = quoteChar(zSchema);
if( cQuote && sqlite3_stricmp(zSchema,"temp")==0 ) cQuote = 0;
appendText(&s, zSchema, cQuote);
appendText(&s, ".", 0);
}
cQuote = quoteChar(zName);
appendText(&s, zName, cQuote);
while( sqlite3_step(pStmt)==SQLITE_ROW ){
const char *zCol = (const char*)sqlite3_column_text(pStmt, 1);
nRow++;
appendText(&s, zDiv, 0);
zDiv = ",";
cQuote = quoteChar(zCol);
appendText(&s, zCol, cQuote);
}
appendText(&s, ")", 0);
sqlite3_finalize(pStmt);
if( nRow==0 ){
freeText(&s);
s.z = 0;
}
return s.z;
}
/*
** SQL function: shell_module_schema(X)
**
** Return a fake schema for the table-valued function or eponymous virtual
** table X.
*/
static void shellModuleSchema(
sqlite3_context *pCtx,
int nVal,
sqlite3_value **apVal
){
const char *zName = (const char*)sqlite3_value_text(apVal[0]);
char *zFake = shellFakeSchema(sqlite3_context_db_handle(pCtx), 0, zName);
UNUSED_PARAMETER(nVal);
if( zFake ){
sqlite3_result_text(pCtx, sqlite3_mprintf("/* %s */", zFake),
-1, sqlite3_free);
free(zFake);
}
}
/*
** SQL function: shell_add_schema(S,X)
**
** Add the schema name X to the CREATE statement in S and return the result.
** Examples:
**
** CREATE TABLE t1(x) -> CREATE TABLE xyz.t1(x);
**
** Also works on
**
** CREATE INDEX
** CREATE UNIQUE INDEX
** CREATE VIEW
** CREATE TRIGGER
** CREATE VIRTUAL TABLE
**
** This UDF is used by the .schema command to insert the schema name of
** attached databases into the middle of the sqlite_schema.sql field.
*/
static void shellAddSchemaName(
sqlite3_context *pCtx,
int nVal,
sqlite3_value **apVal
){
static const char *aPrefix[] = {
"TABLE",
"INDEX",
"UNIQUE INDEX",
"VIEW",
"TRIGGER",
"VIRTUAL TABLE"
};
int i = 0;
const char *zIn = (const char*)sqlite3_value_text(apVal[0]);
const char *zSchema = (const char*)sqlite3_value_text(apVal[1]);
const char *zName = (const char*)sqlite3_value_text(apVal[2]);
sqlite3 *db = sqlite3_context_db_handle(pCtx);
UNUSED_PARAMETER(nVal);
if( zIn!=0 && strncmp(zIn, "CREATE ", 7)==0 ){
for(i=0; i<(int)(sizeof(aPrefix)/sizeof(aPrefix[0])); i++){
int n = strlen30(aPrefix[i]);
if( strncmp(zIn+7, aPrefix[i], n)==0 && zIn[n+7]==' ' ){
char *z = 0;
char *zFake = 0;
if( zSchema ){
char cQuote = quoteChar(zSchema);
if( cQuote && sqlite3_stricmp(zSchema,"temp")!=0 ){
z = sqlite3_mprintf("%.*s \"%w\".%s", n+7, zIn, zSchema, zIn+n+8);
}else{
z = sqlite3_mprintf("%.*s %s.%s", n+7, zIn, zSchema, zIn+n+8);
}
}
if( zName
&& aPrefix[i][0]=='V'
&& (zFake = shellFakeSchema(db, zSchema, zName))!=0
){
if( z==0 ){
z = sqlite3_mprintf("%s\n/* %s */", zIn, zFake);
}else{
z = sqlite3_mprintf("%z\n/* %s */", z, zFake);
}
free(zFake);
}
if( z ){
sqlite3_result_text(pCtx, z, -1, sqlite3_free);
return;
}