Add center3(): centre three strings

src/intf.c

@@ -404,6 +404,73 @@ int center2 (WINDOW *win, int y, int attr_initial, int attr_string,
 }
 
 
+/*-----------------------------------------------------------------------
+  Function:   center3       - Centre three strings on the current line
+  Arguments:  win           - Window to use
+              y             - Line on which to centre the string
+              attr_initial  - Window attribute to use for initial string
+              attr_final    - Window attribute to use for final string
+	      attr_string   - Window attribute to use for main string
+	      initial       - Fixed initial string
+	      final         - Fixed final string
+              format        - printf()-like format string
+              ...           - printf()-like arguments
+  Returns:    int           - Return code from wprintw()
+
+  This function prints three strings in the centre of line y in the
+  window win.  The initial string is printed using the window attributes
+  in attr_initial, the main string uses attr_string and the final string
+  uses attr_final.  No spaces appear between the three strings.  Please
+  note that wrefresh() is NOT called.  Also note ordering of parameters!
+*/
+
+int center3 (WINDOW *win, int y, int attr_initial, int attr_final,
+	     int attr_string, const char *initial, const char *final,
+	     const char *format, ...)
+{
+    va_list args;
+
+    int oldattr;
+    int len1, len2, len3;
+    int ret, x;
+    char *buf;
+
+
+    buf = malloc(BUFSIZE);
+    if (buf == NULL) {
+	err_exit("out of memory");
+    }
+
+    oldattr = getbkgd(win) & ~A_CHARTEXT;
+    wbkgdset(win, A_NORMAL | (oldattr & A_COLOR));
+
+    len1 = strlen(initial);
+    len3 = strlen(final);
+
+    va_start(args, format);
+    len2 = vsnprintf(buf, BUFSIZE, format, args);
+    va_end(args);
+    if (len2 < 0) {
+	free(buf);
+	return ERR;
+    }
+
+    x = (getmaxx(win) - (len1 + len2 + len3)) / 2;
+    wattrset(win, attr_initial);
+    mvwprintw(win, y, MAX(x, 2), "%s", initial);
+    wattrset(win, attr_string);
+    ret = wprintw(win, "%1.*s", getmaxx(win) - len1 - len3 - 4, buf);
+    wattrset(win, attr_final);
+    wprintw(win, "%s", final);
+
+    wattrset(win, oldattr);
+    wbkgdset(win, oldattr);
+
+    free(buf);
+    return ret;
+}
+
+
 /*-----------------------------------------------------------------------
   Function:   attrpr  - Print a string with special attributes
   Arguments:  win     - Window to use

src/intf.h

@@ -176,6 +176,11 @@ extern int center2 (WINDOW *win, int y, int attr_initial, int attr_string,
 		    const char *initial, const char *format, ...)
     __attribute__((format (printf, 6, 7)));
 
+extern int center3 (WINDOW *win, int y, int attr_initial, int attr_final,
+		    int attr_string, const char *initial, const char *final,
+		    const char *format, ...)
+    __attribute__((format (printf, 8, 9)));
+
 extern int attrpr (WINDOW *win, int attr, const char *format, ...)
     __attribute__((format (printf, 3, 4)));