@@ -1716,6 +1716,76 @@ redata_getutf8char(redata_t *redata, long pos, char *buf, int len, int *usedbuf)

         return(0);

 }

+int

+redata_getprevutf8char(redata_t *redata, long pos, char *buf, int len, int *usedbuf)

+{

+        int numchunk;

+        int offset;

+        int ooff;

+        int c;

+        int n;

+        char tmpchar;

+        if(redata==NULL || pos<=0 || pos>redata_getsize(redata) || buf==NULL || len<1 || usedbuf==NULL)

+                return(-1); /* sanity check failed */

+        if(redata_getposptr(redata,pos,&numchunk,&offset)!=0)

+                return(-1); /* couldn't get pos */

+        while(numchunk>0 && offset==0) {

+                numchunk--;

+                offset=redata->chunks[numchunk]->useddata;

+        }

+        if(offset==0)

+                return(-1); /* at start, no data */

+        ooff=0;

+        c=redata->chunks[numchunk]->data[offset-1];

+        offset--;

+        ((unsigned char *)buf)[ooff++]=c;

+        while(ooff<len && (!UTF8_IS_ASCII(c) || UTF8_IS_MULTIBYTECONT(c))) {

+                while(numchunk>0 && offset==0) {

+                        numchunk--;

+                        offset=redata->chunks[numchunk]->useddata;

+                }

+                if(numchunk==0 && offset==0)

+                        break;

+                c=redata->chunks[numchunk]->data[offset-1];

+                offset--;

+                ((unsigned char *)buf)[ooff++]=c;

+        }

+        *usedbuf=ooff;

+        /* invert the data in buf */

+        for(n=0;(ooff-1-n)>n;n++) {

+                tmpchar=buf[n];

+                buf[n]=buf[ooff-1-n];

+                buf[ooff-1-n]=tmpchar;

+        }

+        return(0);

+}

+

+int

+redata_getsubstr(redata_t *redata, long posini, long posend, char *buf, int len, int *usedbuf)

+{

+        int numchunk;

+        int offset;

+        int ooff;

+        long pos;

+        if(redata==NULL || posini<=0 || posini>redata_getsize(redata) || posend<=0 || posend>redata_getsize(redata) || buf==NULL || len<1 || usedbuf==NULL)

+                return(-1); /* sanity check failed */

+        if(redata_getposptr(redata,posini,&numchunk,&offset)!=0)

+                return(-1); /* couldn't get pos */

+        ooff=0;

+        pos=posini;

+        while(ooff<len && pos<posend) {

+                while(numchunk<redata->sizechunks && redata->chunks[numchunk]!=NULL && offset>=redata->chunks[numchunk]->useddata) {

+                        numchunk++;

+                        offset=0;

+                }

+                if(numchunk>=redata->sizechunks)

+                        return(-1); /* at end; no data */

+                buf[ooff++]=redata->chunks[numchunk]->data[offset++];

+                pos++;

+        }

+        *usedbuf=ooff;

+        return(0);

+}

 int

 redata_generic_utf8len(char *ptr, int size)

@@ -174,6 +174,8 @@ long redata_searchbackwards(redata_t *redata, long posini, char *str, int len);

 int redata_memcmp(redata_t *redata, long pos, char *str, int len);

 int redata_getutf8char(redata_t *redata, long pos, char *buf, int len, int *usedbuf);

+int redata_getprevutf8char(redata_t *redata, long pos, char *buf, int len, int *usedbuf);

+int redata_getsubstr(redata_t *redata, long posini, long posend, char *buf, int len, int *usedbuf);

 /* utf8 convenience functions */