Refactoring display primitives.

basic.c

@@ -44,10 +44,8 @@ static unsigned getgoal( line_p dlp) {
             col += 2 ;
         else if( c >= 0x80 && c <= 0xA0)    /* \xx */
             col += 3 ;
-        else {
-            int w = utf8_width( c) ;        /* work around */
-            col += (w < 0) ? 2 : w ;        /* unknown unicode width as \u */
-        }
+        else
+            col += utf8_width( c) ;
 
         if( col > curgoal)
             break ;

display.h

@@ -21,11 +21,7 @@ BINDABLE( upscreen) ;
 void vtinit( void) ;
 void vtfree( void) ;
 void vttidy( void) ;
-int update( boolean force_f) ;
-void updpos( void) ;
-void upddex( void) ;
-void updgar( void) ;
-int updupd( int force) ;
+boolean update( boolean force_f) ;
 void upmode( void) ;
 void movecursor( int row, int col) ;
 void mlerase( void) ;

random.c

@@ -164,8 +164,7 @@ int getccol( int bflg) {
         else if (c >= 0x80 && c <= 0xa0)    /* displayed as \xx */
             col += 3 ;
         else {
-            int w = utf8_width( c) ;        /* incomplete wc_width */
-            col += (w < 0) ? 2 : w ;
+            col += utf8_width( c) ;
         }
     }
 

utf8.c

@@ -7,10 +7,9 @@
 #include <assert.h>
 #include <wchar.h>
 
-/*
- * Display width of UTF-8 character
- */
-int utf8_width( unicode_t c) {
+
+/* Display width of UTF-8 character */
+int _utf8_width( unicode_t c) {
 #if CYGWIN
 	assert( sizeof( wchar_t) == 2) ;	/* wcwidth only supports UTF-16 */
 	return (c < 0x10000) ? wcwidth( (wchar_t) c) : -1 ;
@@ -19,8 +18,14 @@ int utf8_width( unicode_t c) {
 #endif
 }
 
-/*
- * utf8_to_unicode()
+
+int utf8_width( unicode_t c) {
+	int w = _utf8_width( c) ;
+	return (w < 0) ? 2 : w ;		/* display \u if can't figure out width */
+}
+
+
+/* utf8_to_unicode()
  *
  * Convert a UTF-8 sequence to its unicode value, and return the length of
  * the sequence in bytes.
@@ -84,8 +89,8 @@ unsigned utf8_to_unicode( const char *line, unsigned index, unsigned len,
     return bytes;
 }
 
-/*
- * unicode_to_utf8()
+
+/* unicode_to_utf8()
  *
  * Convert a unicode value to its canonical utf-8 sequence.
  *

utf8.h

@@ -4,7 +4,8 @@
 
 typedef unsigned int unicode_t ;
 
-int utf8_width( unicode_t c) ;
+int _utf8_width( unicode_t c) ;	/* straight width */
+int  utf8_width( unicode_t c) ;	/* workaround width */
 unsigned utf8_to_unicode( const char *line, unsigned index, unsigned len,
                                                             unicode_t *res) ;
 unsigned utf8_revdelta( unsigned char *buf, unsigned pos) ;