Change the semantics of 'FontSpec' so that it's a dynamically

allocated type.

The main reason for this is to stop it from taking up a fixed large
amount of space in every 'struct value' subunion in conf.c, although
that makes little difference so far because Filename is still doing
the same thing (and is therefore next on my list). However, the
removal of its arbitrary length limit is not to be sneezed at.

[originally from svn r9314]

windows/winmisc.c

@@ -379,3 +379,51 @@ void *minefield_c_realloc(void *p, size_t size)
 }
 
 #endif				/* MINEFIELD */
+
+FontSpec *fontspec_new(const char *name,
+                        int bold, int height, int charset)
+{
+    FontSpec *f = snew(FontSpec);
+    f->name = dupstr(name);
+    f->isbold = bold;
+    f->height = height;
+    f->charset = charset;
+    return f;
+}
+FontSpec *fontspec_copy(const FontSpec *f)
+{
+    return fontspec_new(f->name, f->isbold, f->height, f->charset);
+}
+void fontspec_free(FontSpec *f)
+{
+    sfree(f->name);
+    sfree(f);
+}
+int fontspec_serialise(FontSpec *f, void *vdata)
+{
+    char *data = (char *)vdata;
+    int len = strlen(f->name) + 1;     /* include trailing NUL */
+    if (data) {
+        strcpy(data, f->name);
+        PUT_32BIT_MSB_FIRST(data + len, f->isbold);
+        PUT_32BIT_MSB_FIRST(data + len + 4, f->height);
+        PUT_32BIT_MSB_FIRST(data + len + 8, f->charset);
+    }
+    return len + 12;                   /* also include three 4-byte ints */
+}
+FontSpec *fontspec_deserialise(void *vdata, int maxsize, int *used)
+{
+    char *data = (char *)vdata;
+    char *end;
+    if (maxsize < 13)
+        return NULL;
+    end = memchr(data, '\0', maxsize-12);
+    if (!end)
+        return NULL;
+    end++;
+    *used = end - data + 12;
+    return fontspec_new(data,
+                        GET_32BIT_MSB_FIRST(end),
+                        GET_32BIT_MSB_FIRST(end + 4),
+                        GET_32BIT_MSB_FIRST(end + 8));
+}