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Internationalize the TRIM functions. Ticket #2323. (CVS 3883)

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FossilOrigin-Name: ff1f4e744728c8f55afae265246797b30fe98fb0
This commit is contained in:
drh
2007-04-27 21:59:52 +00:00
parent ac7b2dd518
commit d1e3a616ca
4 changed files with 71 additions and 27 deletions
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68
src/func.c
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@@ -16,7 +16,7 @@
** sqliteRegisterBuildinFunctions() found at the bottom of the file.
** All other code has file scope.
**
** $Id: func.c,v 1.142 2007/04/27 17:16:20 drh Exp $
** $Id: func.c,v 1.143 2007/04/27 21:59:53 drh Exp $
*/
#include "sqliteInt.h"
#include <ctype.h>
@@ -750,9 +750,12 @@ static void trimFunc(
const unsigned char *zIn; /* Input string */
const unsigned char *zCharSet; /* Set of characters to trim */
int nIn; /* Number of bytes in input */
int flags;
int i;
unsigned char cFirst, cNext;
int flags; /* 1: trimleft 2: trimright 3: trim */
int i; /* Loop counter */
unsigned char *aLen; /* Length of each character in zCharSet */
const unsigned char **azChar; /* Individual characters in zCharSet */
int nChar; /* Number of characters in zCharSet */
if( sqlite3_value_type(argv[0])==SQLITE_NULL ){
return;
}
@@ -760,29 +763,60 @@ static void trimFunc(
zIn = sqlite3_value_text(argv[0]);
if( zIn==0 ) return;
if( argc==1 ){
static const unsigned char zSpace[] = " ";
zCharSet = zSpace;
static const unsigned char lenOne[] = { 1 };
static const char *azOne[] = { " " };
nChar = 1;
aLen = (unsigned char*)lenOne;
azChar = (const unsigned char**)azOne;
zCharSet = 0;
}else if( (zCharSet = sqlite3_value_text(argv[1]))==0 ){
return;
}else{
const unsigned char *z;
for(z=zCharSet, nChar=0; *z; nChar++){
sqliteNextChar(z);
}
if( nChar>0 ){
azChar = sqlite3_malloc( nChar*(sizeof(char*)+1) );
if( azChar==0 ){
return;
}
aLen = (unsigned char*)&azChar[nChar];
for(z=zCharSet, nChar=0; *z; nChar++){
azChar[nChar] = z;
sqliteNextChar(z);
aLen[nChar] = z - azChar[nChar];
}
}
}
cFirst = zCharSet[0];
if( cFirst ){
if( nChar>0 ){
flags = (int)sqlite3_user_data(context);
if( flags & 1 ){
for(; nIn>0; nIn--, zIn++){
if( cFirst==zIn[0] ) continue;
for(i=1; zCharSet[i] && zCharSet[i]!=zIn[0]; i++){}
if( zCharSet[i]==0 ) break;
while( nIn>0 ){
int len;
for(i=0; i<nChar; i++){
len = aLen[i];
if( memcmp(zIn, azChar[i], len)==0 ) break;
}
if( i>=nChar ) break;
zIn += len;
nIn -= len;
}
}
if( flags & 2 ){
for(; nIn>0; nIn--){
cNext = zIn[nIn-1];
if( cFirst==cNext ) continue;
for(i=1; zCharSet[i] && zCharSet[i]!=cNext; i++){}
if( zCharSet[i]==0 ) break;
while( nIn>0 ){
int len;
for(i=0; i<nChar; i++){
len = aLen[i];
if( len<=nIn && memcmp(&zIn[nIn-len],azChar[i],len)==0 ) break;
}
if( i>=nChar ) break;
nIn -= len;
}
}
if( zCharSet ){
sqlite3_free(azChar);
}
}
sqlite3_result_text(context, (char*)zIn, nIn, SQLITE_TRANSIENT);
}