bugfix: sf.net #900 LTRIM and TRIM truncate result if filter is zero length string

- [L]TRIM( wstring, filter ) will return a zero length string if the filter is also a zero length string

Author: jayrm

changelog.txt

@@ -15,7 +15,8 @@ Version 1.07.0
 - sf.net #897: length of literal wstring is miscalculated at compile time.  Compile time evaluation of len(!"\u1234") was using the internal escaped string length instead of the actual codepoint length
 - github #137: Final -Wl flag takes precedence over previous.  fbc now passes down all options from all -Wa, -Wc, and -Wl flags (William Breathitt Gray)
 - github #138: rtlib: freebsd: Fix deprecated use of VM_METER to use VM_TOTAL (William Breathitt Gray)
-- sf.net #899: trim( wstring ) causes crash if string is single space
+- sf.net #899: TRIM( wstring ) causes crash if string is single space
+- sf.net #900: LTRIM( wstring, filter ) and TRIM( wstring, filter ) truncate result if filter is zero length string
 
 
 Version 1.06.0

src/rtlib/strw_ltrimex.c

@@ -6,7 +6,7 @@ FBCALL FB_WCHAR *fb_WstrLTrimEx ( const FB_WCHAR *src, const FB_WCHAR *pattern )
 {
 	FB_WCHAR 	*dst;
 	ssize_t len;
-	const FB_WCHAR *p = NULL;
+	const FB_WCHAR *p = src;
 
     if( src == NULL ) {
         return NULL;

src/rtlib/strw_rtrimex.c

@@ -6,7 +6,7 @@ FBCALL FB_WCHAR *fb_WstrRTrimEx ( const FB_WCHAR *src, const FB_WCHAR *pattern )
 {
 	FB_WCHAR 	*dst;
 	ssize_t len;
-	const FB_WCHAR *p = NULL;
+	const FB_WCHAR *p = src;
 
     if( src == NULL ) {
         return NULL;

src/rtlib/strw_trimex.c

@@ -6,7 +6,7 @@ FBCALL FB_WCHAR *fb_WstrTrimEx ( const FB_WCHAR *src, const FB_WCHAR *pattern )
 {
 	FB_WCHAR 	*dst;
 	ssize_t len;
-	const FB_WCHAR *p = NULL;
+	const FB_WCHAR *p = src;
 
     if( src == NULL ) {
         return NULL;