Final fix for utf8 CutText

1 files changed, 31 insertions, 6 deletions

diff --git a/tools.c b/tools.c
index 229bf9e..04271d3 100644
--- a/tools.c
+++ b/tools.c
@@ -23,22 +23,47 @@ cPlugin *GetScraperPlugin(void) {
 /****************************************************************************************
 *            CUTTEXT
 ****************************************************************************************/
+std::string utf8_substr(const std::string& str, unsigned int start, long unsigned int leng) {
+    if (leng==0) { return ""; }
+    unsigned int c, i, ix, q;
+    long unsigned int min=std::string::npos, max=std::string::npos;
+    for (q=0, i=0, ix=str.length(); i < ix; i++, q++) {
+        if (q==start){ min=i; }
+        if (q<=start+leng || leng==std::string::npos){ max=i; }
+
+        c = (unsigned char) str[i];
+        if      (c>=0   && c<=127) i+=0;
+        else if ((c & 0xE0) == 0xC0) i+=1;
+        else if ((c & 0xF0) == 0xE0) i+=2;
+        else if ((c & 0xF8) == 0xF0) i+=3;
+        //else if (($c & 0xFC) == 0xF8) i+=4; // 111110bb //byte 5, unnecessary in 4 byte UTF-8
+        //else if (($c & 0xFE) == 0xFC) i+=5; // 1111110b //byte 6, unnecessary in 4 byte UTF-8
+        else return "";//invalid utf8
+    }
+    if (q<=start+leng || leng==std::string::npos){ max=i; }
+    if (min==std::string::npos || max==std::string::npos) { return ""; }
+    return str.substr(min,max);
+}
+
 std::string CutText(std::string text, int width, const cFont *font) {
     int actWidth = font->Width(text.c_str());
     if (actWidth <= width) {
         return text.c_str();
     } else {
-        int i = std::max((actWidth - width) / font->Size(), 1);
+        int i = std::max(width / font->Size(), 1) - 1;
+        std::string cuttext, oldtext;
+        cuttext = utf8_substr(text, 0, i);
         do {
-            text = text.substr(0, text.length() - i);
+            oldtext = cuttext;
+            i++;
+            cuttext = utf8_substr(text, 0, i);
             std::stringstream sstrText;
-            sstrText << text << "....";
+            sstrText << cuttext << "...";
             actWidth = font->Width(sstrText.str().c_str());
-            i = 1;
         }
-        while ((actWidth > width) && (text.length() > 0));
+        while (actWidth < width);
         std::stringstream sstrText2;
-        sstrText2 << text << "...";
+        sstrText2 << oldtext << "...";
         return sstrText2.str();
     }
 }