range: Eliminate direct Range member access

Users of struct Range mess liberally with its members, which makes
refactoring hard.  Create a set of methods, and convert all users to
call them instead of accessing members.  The methods have carefully
worded contracts, and use assertions to check them.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

2 files changed, 17 insertions, 21 deletions

diff --git a/qapi/string-input-visitor.c b/qapi/string-input-visitor.c
index b546e5f..0690abb 100644
--- a/qapi/string-input-visitor.c
+++ b/qapi/string-input-visitor.c
@@ -59,8 +59,7 @@ static int parse_str(StringInputVisitor *siv, const char *name, Error **errp)
         if (errno == 0 && endptr > str) {
             if (*endptr == '\0') {
                 cur = g_malloc0(sizeof(*cur));
-                cur->begin = start;
-                cur->end = start + 1;
+                range_set_bounds(cur, start, start);
                 siv->ranges = range_list_insert(siv->ranges, cur);
                 cur = NULL;
                 str = NULL;
@@ -73,16 +72,14 @@ static int parse_str(StringInputVisitor *siv, const char *name, Error **errp)
                      end < start + 65536)) {
                     if (*endptr == '\0') {
                         cur = g_malloc0(sizeof(*cur));
-                        cur->begin = start;
-                        cur->end = end + 1;
+                        range_set_bounds(cur, start, end);
                         siv->ranges = range_list_insert(siv->ranges, cur);
                         cur = NULL;
                         str = NULL;
                     } else if (*endptr == ',') {
                         str = endptr + 1;
                         cur = g_malloc0(sizeof(*cur));
-                        cur->begin = start;
-                        cur->end = end + 1;
+                        range_set_bounds(cur, start, end);
                         siv->ranges = range_list_insert(siv->ranges, cur);
                         cur = NULL;
                     } else {
@@ -94,8 +91,7 @@ static int parse_str(StringInputVisitor *siv, const char *name, Error **errp)
             } else if (*endptr == ',') {
                 str = endptr + 1;
                 cur = g_malloc0(sizeof(*cur));
-                cur->begin = start;
-                cur->end = start + 1;
+                range_set_bounds(cur, start, start);
                 siv->ranges = range_list_insert(siv->ranges, cur);
                 cur = NULL;
             } else {
@@ -134,7 +130,7 @@ start_list(Visitor *v, const char *name, GenericList **list, size_t size,
     if (siv->cur_range) {
         Range *r = siv->cur_range->data;
         if (r) {
-            siv->cur = r->begin;
+            siv->cur = range_lob(r);
         }
         *list = g_malloc0(size);
     } else {
@@ -156,7 +152,7 @@ static GenericList *next_list(Visitor *v, GenericList *tail, size_t size)
         return NULL;
     }
 
-    if (siv->cur < r->begin || siv->cur >= r->end) {
+    if (!range_contains(r, siv->cur)) {
         siv->cur_range = g_list_next(siv->cur_range);
         if (!siv->cur_range) {
             return NULL;
@@ -165,7 +161,7 @@ static GenericList *next_list(Visitor *v, GenericList *tail, size_t size)
         if (!r) {
             return NULL;
         }
-        siv->cur = r->begin;
+        siv->cur = range_lob(r);
     }
 
     tail->next = g_malloc0(size);
@@ -208,7 +204,7 @@ static void parse_type_int64(Visitor *v, const char *name, int64_t *obj,
             goto error;
         }
 
-        siv->cur = r->begin;
+        siv->cur = range_lob(r);
     }
 
     *obj = siv->cur;
diff --git a/qapi/string-output-visitor.c b/qapi/string-output-visitor.c
index 5ea395a..c6f01f9 100644
--- a/qapi/string-output-visitor.c
+++ b/qapi/string-output-visitor.c
@@ -83,8 +83,8 @@ static void string_output_set(StringOutputVisitor *sov, char *string)
 static void string_output_append(StringOutputVisitor *sov, int64_t a)
 {
     Range *r = g_malloc0(sizeof(*r));
-    r->begin = a;
-    r->end = a + 1;
+
+    range_set_bounds(r, a, a);
     sov->ranges = range_list_insert(sov->ranges, r);
 }
 
@@ -92,28 +92,28 @@ static void string_output_append_range(StringOutputVisitor *sov,
                                        int64_t s, int64_t e)
 {
     Range *r = g_malloc0(sizeof(*r));
-    r->begin = s;
-    r->end = e + 1;
+
+    range_set_bounds(r, s, e);
     sov->ranges = range_list_insert(sov->ranges, r);
 }
 
 static void format_string(StringOutputVisitor *sov, Range *r, bool next,
                           bool human)
 {
-    if (r->end - r->begin > 1) {
+    if (range_lob(r) != range_upb(r)) {
         if (human) {
             g_string_append_printf(sov->string, "0x%" PRIx64 "-0x%" PRIx64,
-                                   r->begin, r->end - 1);
+                                   range_lob(r), range_upb(r));
 
         } else {
             g_string_append_printf(sov->string, "%" PRId64 "-%" PRId64,
-                                   r->begin, r->end - 1);
+                                   range_lob(r), range_upb(r));
         }
     } else {
         if (human) {
-            g_string_append_printf(sov->string, "0x%" PRIx64, r->begin);
+            g_string_append_printf(sov->string, "0x%" PRIx64, range_lob(r));
         } else {
-            g_string_append_printf(sov->string, "%" PRId64, r->begin);
+            g_string_append_printf(sov->string, "%" PRId64, range_lob(r));
         }
     }
     if (next) {