Use integers rather than floats everywhere

We don't need floating point precision if results are casted back to
integer. Instead, rearrange operations and do the integer division after
the multiplication.

Version numbers are terminating decimals anyway and can be stored using
two integers without losing any information.

Signed-off-by: Lukas Fleischer <calcurse@cryptocrack.de>

src/apoint.c

@@ -359,9 +359,8 @@ void apoint_update_panel(int which_pan)
 
   /* Draw the scrollbar if necessary. */
   if ((apad.length >= app_length) || (apad.first_onscreen > 0)) {
-    float ratio = ((float)app_length) / ((float)apad.length);
-    int sbar_length = (int)(ratio * app_length);
-    int highend = (int)(ratio * apad.first_onscreen);
+    int sbar_length = app_length * app_length / apad.length;
+    int highend = app_length * apad.first_onscreen / apad.length;
     unsigned hilt_bar = (which_pan == APP) ? 1 : 0;
     int sbar_top = highend + title_lines + 1;
 

src/ical.c

@@ -237,13 +237,13 @@ static void ical_export_todo(FILE * stream)
 }
 
 /* Print a header to describe import log report format. */
-static void ical_log_init(FILE * log, float version)
+static void ical_log_init(FILE * log, int major, int minor)
 {
   const char *header =
       "+-------------------------------------------------------------------+\n"
       "| Calcurse icalendar import log.                                    |\n"
       "|                                                                   |\n"
-      "| Items imported from icalendar file, version %1.1f                   |\n"
+      "| Items imported from icalendar file, version %d.%d                   |\n"
       "| Some items could not be imported, they are described hereafter.   |\n"
       "| The log line format is as follows:                                |\n"
       "|                                                                   |\n"
@@ -256,7 +256,7 @@ static void ical_log_init(FILE * log, float version)
       "+-------------------------------------------------------------------+\n\n";
 
   if (log)
-    fprintf(log, header, version);
+    fprintf(log, header, major, minor);
 }
 
 /*
@@ -419,25 +419,25 @@ static int ical_readline(FILE * fdi, char *buf, char *lstore, unsigned *ln)
   return 1;
 }
 
-static float
-ical_chk_header(FILE * fd, char *buf, char *lstore, unsigned *lineno)
+static int
+ical_chk_header(FILE * fd, char *buf, char *lstore, unsigned *lineno,
+                int *major, int *minor)
 {
-  const int HEADER_MALFORMED = -1;
   const char icalheader[] = "BEGIN:VCALENDAR";
-  float version;
 
   if (!ical_readline(fd, buf, lstore, lineno))
-    return HEADER_MALFORMED;
+    return 0;
 
   str_toupper(buf);
   if (strncmp(buf, icalheader, sizeof(icalheader) - 1) != 0)
-    return HEADER_MALFORMED;
+    return 0;
 
-  while (!sscanf(buf, "VERSION:%f", &version)) {
+  while (!sscanf(buf, "VERSION:%d.%d", major, minor)) {
     if (!ical_readline(fd, buf, lstore, lineno))
-      return HEADER_MALFORMED;
+      return 0;
   }
-  return version;
+
+  return 1;
 }
 
 /*
@@ -1055,15 +1055,14 @@ ical_import_data(FILE * stream, FILE * log, unsigned *events, unsigned *apoints,
   const char vevent[] = "BEGIN:VEVENT";
   const char vtodo[] = "BEGIN:VTODO";
   char buf[BUFSIZ], lstore[BUFSIZ];
-  float ical_version;
+  int major, minor;
 
   ical_readline_init(stream, buf, lstore, lines);
-  ical_version = ical_chk_header(stream, buf, lstore, lines);
-  RETURN_IF(ical_version < 0,
+  RETURN_IF(!ical_chk_header(stream, buf, lstore, lines, &major, &minor),
             _("Warning: ical header malformed or wrong version number. "
               "Aborting..."));
 
-  ical_log_init(log, ical_version);
+  ical_log_init(log, major, minor);
 
   while (ical_readline(stream, buf, lstore, lines)) {
     (*lines)++;

src/todo.c

@@ -311,9 +311,8 @@ void todo_update_panel(int which_pan)
 
   /* Draw the scrollbar if necessary. */
   if (todos > max_items) {
-    float ratio = ((float)max_items) / ((float)todos);
-    int sbar_length = (int)(ratio * (max_items + 1));
-    int highend = (int)(ratio * first);
+    int sbar_length = max_items * (max_items + 1) / todos;
+    int highend = max_items * first / todos;
     unsigned hilt_bar = (which_pan == TOD) ? 1 : 0;
     int sbar_top = highend + title_lines;
 

src/wins.c

@@ -253,9 +253,8 @@ void wins_scrollwin_display(struct scrollwin *sw)
   const int visible_lines = sw->win.h - sw->pad.y - 1;
 
   if (sw->total_lines > visible_lines) {
-    float ratio = ((float)visible_lines) / ((float)sw->total_lines);
-    int sbar_length = (int)(ratio * visible_lines);
-    int highend = (int)(ratio * sw->first_visible_line);
+    int sbar_length = visible_lines * visible_lines / sw->total_lines;
+    int highend = visible_lines * sw->first_visible_line / sw->total_lines;
     int sbar_top = highend + sw->pad.y + 1;
 
     if ((sbar_top + sbar_length) > sw->win.h - 1)