more skill size savings.

src/kernel/save.c

@@ -324,20 +324,29 @@ static void writeorder(gamedata *data, const struct order *ord,
 static void read_skill(gamedata *data, skill *sv) {
     int val;
     READ_INT(data->store, &val);
+    assert(val < MAXSKILLS);
     sv->id = (skill_t)val;
     if (sv->id != NOSKILL) {
         READ_INT(data->store, &val);
+        assert(val < CHAR_MAX);
         sv->old = sv->level = val;
         READ_INT(data->store, &val);
+        assert(val < CHAR_MAX);
         sv->weeks = val;
     }
 }
 
+static int skill_cmp(const void *a, const void *b) {
+    const skill * sa = (const skill *)a;
+    const skill * sb = (const skill *)b;
+    return sa->id - sb->id;
+}
+
 static void read_skills(gamedata *data, unit *u)
 {
     if (data->version < SKILLSORT_VERSION) {
         skill skills[MAXSKILLS], *sv = skills;
-        size_t sz;
+
         u->skill_size = 0;
         for (;;) {
             read_skill(data, sv);
@@ -347,9 +356,13 @@ static void read_skills(gamedata *data, unit *u)
                 ++u->skill_size;
             }
         }
-        sz = u->skill_size * sizeof(skill);
-        u->skills = malloc(sz);
-        memcpy(u->skills, skills, sz);
+        if (u->skill_size > 0) {
+            size_t sz = u->skill_size * sizeof(skill);
+
+            qsort(skills, u->skill_size, sizeof(skill), skill_cmp);
+            u->skills = malloc(sz);
+            memcpy(u->skills, skills, sz);
+        }
     }
     else {
         int i;

src/kernel/ship.test.c

@@ -619,7 +619,8 @@ static void test_shipspeed_max_range(CuTest *tc) {
     CuAssertIntEquals_Msg(tc, "skill bonus from movement.shipspeed.skillbonus", 3, shipspeed(sh, cap));
 
     set_level(cap, SK_SAILING, stype->cptskill + 15);
-    set_level(crew, SK_SAILING, (stype->sumskill - stype->cptskill) * 15);
+    scale_number(crew, 15);
+    set_level(crew, SK_SAILING, stype->sumskill - stype->cptskill);
     CuAssertIntEquals_Msg(tc, "skill-bonus cannot exceed max_range", 4, shipspeed(sh, cap));
     test_teardown();
 }

src/kernel/skills.h

@@ -26,10 +26,10 @@ extern "C" {
 #endif
 
     typedef struct skill {
-        skill_t id : 16;
-        int level : 16;
-        int weeks : 16;
-        int old : 16;
+        skill_t id : 8;
+        int level : 8;
+        int weeks : 8;
+        int old : 8;
     } skill;
 
     typedef int(*skillmod_fun) (const struct unit *, const struct region *,

src/kernel/unit.c

@@ -795,6 +795,7 @@ void set_level(unit * u, skill_t sk, int value)
     skill *sv = u->skills;
 
     assert(sk != SK_MAGIC || !u->faction || u->number == 1 || fval(u->faction, FFL_NPC));
+    assert(value <= CHAR_MAX && value >= CHAR_MIN);
     if (!skill_enabled(sk))
         return;
 

src/study.c

@@ -828,6 +828,7 @@ void learn_skill(unit *u, skill_t sk, int days) {
     int leveldays = STUDYDAYS * u->number;
     int weeks = 0;
 
+    assert(sk >= 0 && sk < MAXSKILLS);
     if (inject_learn_fun) {
         inject_learn_fun(u, sk, days);
         return;