X-Git-Url: https://git.openstreetmap.org./nominatim.git/blobdiff_plain/491f5961e1b6094d982f8174614991e70d95e6d4..66832cf0a51777cf9fb1c74459de9f46160ea15e:/module/nominatim.c

diff --git a/module/nominatim.c b/module/nominatim.c
index 63b2baf4..9d43c22f 100644
--- a/module/nominatim.c
+++ b/module/nominatim.c
@@ -1,3 +1,11 @@
+/**
+ * SPDX-License-Identifier: GPL-2.0-only
+ *
+ * This file is part of Nominatim. (https://nominatim.org)
+ *
+ * Copyright (C) 2022 by the Nominatim developer community.
+ * For a full list of authors see the git log.
+ */
 #include "postgres.h"
 #include "fmgr.h"
 #include "mb/pg_wchar.h"
@@ -54,7 +62,8 @@ transliteration( PG_FUNCTION_ARGS )
 	wchardatastart = wchardata = (unsigned int *)palloc((sourcedatalength+1)*sizeof(int));
 
 	// Based on pg_utf2wchar_with_len from wchar.c
-        while (sourcedatalength > 0 && *sourcedata)
+	// Postgresql strings are not zero terminalted
+        while (sourcedatalength > 0)
         {
                 if ((*sourcedata & 0x80) == 0)
                 {
@@ -68,7 +77,7 @@ transliteration( PG_FUNCTION_ARGS )
                         c1 = *sourcedata++ & 0x1f;
                         c2 = *sourcedata++ & 0x3f;
                         *wchardata = (c1 << 6) | c2;
-			wchardata++;
+			if (*wchardata < 65536) wchardata++;
                         sourcedatalength -= 2;
                 }
                 else if ((*sourcedata & 0xf0) == 0xe0)
@@ -78,7 +87,7 @@ transliteration( PG_FUNCTION_ARGS )
                         c2 = *sourcedata++ & 0x3f;
                         c3 = *sourcedata++ & 0x3f;
                         *wchardata = (c1 << 12) | (c2 << 6) | c3;
-			wchardata++;
+			if (*wchardata < 65536) wchardata++;
                         sourcedatalength -= 3;
                 }
                 else if ((*sourcedata & 0xf8) == 0xf0)
@@ -89,7 +98,7 @@ transliteration( PG_FUNCTION_ARGS )
                         c3 = *sourcedata++ & 0x3f;
                         c4 = *sourcedata++ & 0x3f;
                         *wchardata = (c1 << 18) | (c2 << 12) | (c3 << 6) | c4;
-			wchardata++;
+			if (*wchardata < 65536) wchardata++;
                         sourcedatalength -= 4;
                 }
                 else if ((*sourcedata & 0xfc) == 0xf8)
@@ -97,17 +106,20 @@ transliteration( PG_FUNCTION_ARGS )
 			// table does not extend beyond 4 char long, just skip
 			if (sourcedatalength < 5) break;
 			sourcedatalength -= 5;
+			sourcedata += 5;
 		}
                 else if ((*sourcedata & 0xfe) == 0xfc)
                 {
 			// table does not extend beyond 4 char long, just skip
 			if (sourcedatalength < 6) break;
 			sourcedatalength -= 6;
+			sourcedata += 6;
 		}
                 else
                 {
 			// assume lenngth 1, silently drop bogus characters
                         sourcedatalength--;
+			sourcedata += 1;
                 }
         }
         *wchardata = 0;
@@ -139,12 +151,12 @@ transliteration( PG_FUNCTION_ARGS )
 				resultdata++;
 			}
 		}
-		else
+		/*else
 		{
 			ereport( WARNING, ( errcode( ERRCODE_SUCCESSFUL_COMPLETION ),
 		              errmsg( "missing char: %i\n", *wchardata )));
 			
-		}
+		}*/
 		wchardata++;
 	}
 
@@ -153,17 +165,18 @@ transliteration( PG_FUNCTION_ARGS )
 	PG_RETURN_TEXT_P(result);
 }
 
+// Set isspace=1 if the replacement _only_ adds a space before the search string.  I.e. to == " " + from
 void str_replace(char* buffer, int* len, int* changes, char* from, int fromlen, char* to, int tolen, int isspace)
 {
         char *p;
 
-        // Search string is too long to be pressent
+        // Search string is too long to be present
         if (fromlen > *len) return;
 
         p = strstr(buffer, from);
         while(p)
         {
-                if (!isspace || *(p-1) != ' ')
+                if (!isspace || (p > buffer && *(p-1) != ' '))
                 {
                         (*changes)++;
                         if (tolen != fromlen) memmove(p+tolen, p+fromlen, *len-(p-buffer)+1);
@@ -226,7 +239,7 @@ gettokenstring( PG_FUNCTION_ARGS )
 	sourcedata = (unsigned char *)VARDATA(source);
 	sourcedatalength = VARSIZE(source) - VARHDRSZ;
 
-	// Buffer for doing the replace in - string could get slightly longer (double is mastive overkill)
+	// Buffer for doing the replace in - string could get slightly longer (double is massive overkill)
 	buffer = (char *)palloc((sourcedatalength*2)*sizeof(char));
 	memcpy(buffer+1, sourcedata, sourcedatalength);
 	buffer[0] = 32;