From: Christian Heller <c.heller@plomlompom.de>
Date: Tue, 23 Jul 2013 03:04:27 +0000 (+0200)
Subject: More documentation and re-styling of code according to new rules.
X-Git-Tag: tce~1136
X-Git-Url: https://plomlompom.com/repos/%7B%7B%20web_path%20%7D%7D/decks/%7B%7Bdb.prefix%7D%7D/static/blog?a=commitdiff_plain;h=120715d0a4a308cdf748e1925be472ed6a59f092;p=plomrogue

More documentation and re-styling of code according to new rules.
---

diff --git a/src/map_objects.c b/src/map_objects.c
index 747b718..9adf634 100644
--- a/src/map_objects.c
+++ b/src/map_objects.c
@@ -1,136 +1,216 @@
+/* map_objects.c */
+
 #include "map_objects.h"
-#include <stdlib.h>
-#include <stdio.h>
-#include <string.h>
-#include "readwrite.h"
-#include "misc.h"
-#include "main.h"
-
-static struct MapObj * get_next_map_obj (void *, char *, size_t, struct MapObj *);
-
-extern void init_map_object_defs (struct World * world, char * filename) {
-// Initialize map object definitions from file at path "filename".
-  world->item_def = 0;
-  world->monster_def = 0;
-  FILE *                file    = fopen(filename, "r");
-  uint16_t              linemax;
-  textfile_sizes (file, &linemax, NULL);
-  struct MapObjDef      mod;
-  struct ItemDef        id;
-  struct MonsterDef     md;
-  struct ItemDef    * * p_p_id  = &world->item_def;
-  struct MonsterDef * * p_p_md  = &world->monster_def;
-  char *                defline = malloc(linemax);
-  char *                line_p;
-  char                  m_or_i;
-  while (fgets (defline, linemax, file)) {
-    mod.next    = 0;
-    mod.id      = atoi(defline);
-    line_p      = strchr(defline, ' ') + 1;
-    m_or_i      = * line_p;
-    mod.mapchar = * (line_p + 2);
-    if ('i' == m_or_i)
-      line_p = line_p + 5;
-    else {
-      md.hitpoints_start = atoi   (line_p + 4);
-      line_p             = strchr (line_p + 4, ' ') + 1; }
-    mod.desc = calloc (strlen (line_p), sizeof(char));
-    memcpy (mod.desc, line_p, strlen(line_p) - 1);
-    if ('i' == m_or_i) {
-      id.map_obj_def = mod;
-      * p_p_id       = malloc (sizeof (struct ItemDef));
-      * * p_p_id     = id;
-      p_p_id         = (struct ItemDef    * *) * p_p_id; }
-    else {
-      md.map_obj_def = mod;
-      * p_p_md       = malloc (sizeof (struct MonsterDef));
-      * * p_p_md     = md;
-      p_p_md         = (struct MonsterDef * *) * p_p_md; } }
-  free(defline);
-  fclose(file); };
-
-extern void write_map_objects_monsterdata (void * start, FILE * file) {
-// Write to file data specific to map objects of type monster.
-  struct Monster * m = (struct Monster *) start;
-  fputc(m->hitpoints, file); }
-
-extern void write_map_objects (void * start, FILE * file, void (* w_typedata) (void *, FILE *) ) {
-// Write into file the map object chain starting at start, use write_type() for object-type specific data.
-  struct MapObj * map_obj;
-  for (map_obj = start; map_obj != 0; map_obj = map_obj->next) {
-    write_uint16_bigendian(map_obj->pos.y + 1, file);
-    write_uint16_bigendian(map_obj->pos.x + 1, file);
-    fputc(map_obj->type, file);
-    if (w_typedata)
-      w_typedata (map_obj, file); }
-  write_uint16_bigendian(0, file); }
-
-extern void read_map_objects_monsterdata (void * start, FILE * file) {
-// Read from file data speciifc to map objects of type monster.
+#include <stdlib.h> /* for malloc(), calloc(), free(), atoi() */
+#include <stdio.h> /* for FILE typedef */
+#include <string.h> /* for strchr(), strlen(), memcpy()  */
+#include "readwrite.h" /* for all the map object (def) loading/saving */
+#include "misc.h" /* for textfile_sizes(), find_passable_pos() */
+#include "main.h" /* for World struct */
+
+
+
+/* Return pointer to newly allocated map object struct of size "size". If first
+ * in map object chain ("first" pointing to !0), point "start" to it.
+ */
+static struct MapObj * get_next_map_obj(void * start, char * first,
+                                        size_t size, struct MapObj * map_obj);
+
+
+
+static struct MapObj * get_next_map_obj(void * start, char * first,
+                                        size_t size, struct MapObj * map_obj)
+{
+    if (* first)
+    {
+        struct MapObj * * z = start;
+        map_obj = malloc(size);
+        * z = map_obj;
+        * first = 0;
+    }
+    else
+    {
+        map_obj->next = malloc(size);
+        map_obj = map_obj->next;
+    }
+    return map_obj;
+}
+
+
+
+extern void init_map_object_defs(struct World * world, char * filename)
+{
+    world->item_def = 0;
+    world->monster_def = 0;
+    FILE *                file    = fopen(filename, "r");
+    uint16_t              linemax;
+    textfile_sizes (file, &linemax, NULL);
+    struct MapObjDef      mod;
+    struct ItemDef        id;
+    struct MonsterDef     md;
+    struct ItemDef    * * p_p_id  = &world->item_def;
+    struct MonsterDef * * p_p_md  = &world->monster_def;
+    char *                defline = malloc(linemax);
+    char *                line_p;
+    char                  m_or_i;
+    while (fgets(defline, linemax, file))
+    {
+        mod.next    = 0;
+        mod.id      = atoi(defline);
+        line_p      = strchr(defline, ' ') + 1;
+        m_or_i      = * line_p;
+        mod.mapchar = * (line_p + 2);
+        if ('i' == m_or_i)
+        {
+            line_p = line_p + 5;
+        }
+        else
+        {
+            md.hitpoints_start = atoi   (line_p + 4);
+            line_p             = strchr (line_p + 4, ' ') + 1;
+        }
+        mod.desc = calloc (strlen (line_p), sizeof(char));
+        memcpy (mod.desc, line_p, strlen(line_p) - 1);
+        if ('i' == m_or_i)
+        {
+            id.map_obj_def = mod;
+            * p_p_id       = malloc(sizeof(struct ItemDef));
+            * * p_p_id     = id;
+            p_p_id         = (struct ItemDef    * *) * p_p_id;
+        }
+        else
+        {
+            md.map_obj_def = mod;
+            * p_p_md       = malloc(sizeof(struct MonsterDef));
+            * * p_p_md     = md;
+            p_p_md         = (struct MonsterDef * *) * p_p_md;
+        }
+    }
+    free(defline);
+    fclose(file);
+};
+
+
+
+extern void write_map_objects(void * start, FILE * file,
+                              void (* w_typedata) (void *, FILE *) )
+{
+    struct MapObj * map_obj;
+    for (map_obj = start; map_obj != 0; map_obj = map_obj->next)
+    {
+        write_uint16_bigendian(map_obj->pos.y + 1, file);
+        write_uint16_bigendian(map_obj->pos.x + 1, file);
+        fputc(map_obj->type, file);
+        if (w_typedata)
+        {
+            w_typedata (map_obj, file);
+        }
+    }
+    write_uint16_bigendian(0, file);
+}
+
+
+
+extern void read_map_objects (void * start, FILE * file, size_t size,
+                              void (* r_typedata) (void *, FILE *) )
+{
+    struct MapObj * map_obj;
+    uint16_t test;
+    char first = 1;
+    while (1)
+    {
+        test = read_uint16_bigendian(file);
+        if (0 == test)
+        {
+            break;
+        }
+        map_obj = get_next_map_obj(start, &first, size, map_obj);
+        map_obj->pos.y = test - 1;
+        map_obj->pos.x = read_uint16_bigendian(file) - 1;
+        map_obj->type = fgetc(file);
+        if (r_typedata)
+        {
+            r_typedata(map_obj, file);
+        }
+    }
+    if (!first)
+    {
+        map_obj->next = 0;
+    }
+}
+
+
+
+extern void write_map_objects_monsterdata(void * start, FILE * file)
+{
   struct Monster * m = (struct Monster *) start;
-  m->hitpoints = fgetc(file); }
-
-static struct MapObj * get_next_map_obj (void * start, char * first, size_t size, struct MapObj * map_obj) {
-// Return pointer to map object of "size". If first in chain ("first" pointing to !0), point "start" to it.
-  if (* first) {
-    struct MapObj * * z = start;
-    map_obj = malloc(size);
-    * z = map_obj;
-    * first = 0; }
-  else {
-    map_obj->next = malloc(size);
-    map_obj = map_obj->next; }
-  return map_obj; }
-
-extern void read_map_objects (void * start, FILE * file, size_t size, void (* r_typedata) (void *, FILE *) ) {
-// Read from file chain of map objects starting at start, use r_typedata() for object-type specific data.
-  struct MapObj * map_obj;
-  uint16_t test;
-  char first = 1;
-  while (1) {
-    test = read_uint16_bigendian(file);
-    if (0 == test)
-      break;
-    map_obj = get_next_map_obj(start, &first, size, map_obj);
-    map_obj->pos.y = test - 1;
-    map_obj->pos.x = read_uint16_bigendian(file) - 1;
-    map_obj->type = fgetc(file);
-    if (r_typedata)
-      r_typedata (map_obj, file); }
-  if (!first)
-    map_obj->next = 0; }
-
-extern void build_map_objects_monsterdata (struct MapObjDef * map_obj_def, void * start) {
-// Build data specific to map objects of type monster.
+  fputc(m->hitpoints, file);
+}
+
+
+
+extern void read_map_objects_monsterdata (void * start, FILE * file)
+{
   struct Monster * m = (struct Monster *) start;
-  m->map_obj.type = map_obj_def->id;
-  struct MonsterDef * md = (struct MonsterDef *) map_obj_def;
-  m->hitpoints = md->hitpoints_start; }
+  m->hitpoints = fgetc(file);
+}
+
+
+
+extern void * build_map_objects(struct World * world, void * start, char def_id,
+                                unsigned char n, size_t size,
+                                void (* b_typedata) (struct MapObjDef *, void *))
+{
+    unsigned char i;
+    struct MapObj * mo;
+    char first = 1;
+    struct MapObjDef * mod = get_map_obj_def(world, def_id);
+    for (i = 0; i < n; i++)
+    {
+        mo = get_next_map_obj(start, &first, size, mo);
+        mo->pos = find_passable_pos(world->map);
+        b_typedata(mod, mo);
+    }
+    if (!first)
+    {
+        mo->next = 0;
+    }
+    return &mo->next;
+}
 
-extern void build_map_objects_itemdata (struct MapObjDef * map_obj_def, void * start) {
-// Build data speciifc to map objects of type data.
+
+
+extern void build_map_objects_itemdata(struct MapObjDef * map_obj_def,
+                                       void * start)
+{
   struct Item * i = (struct Item *) start;
-  i->map_obj.type = map_obj_def->id; }
-
-extern void * build_map_objects (struct World * world, void * start, char def_id, unsigned char n,
-                                 size_t size, void (* b_typedata) (struct MapObjDef *, void *)) {
-// Build chain of n map objects starting at start, use f() for object-specific data.
-  unsigned char i;
-  struct MapObj * mo;
-  char first = 1;
-  struct MapObjDef * mod = get_map_obj_def (world, def_id);
-  for (i = 0; i < n; i++) {
-    mo = get_next_map_obj(start, &first, size, mo);
-    mo->pos = find_passable_pos(world->map);
-    b_typedata (mod, mo); }
-  if (!first)
-    mo->next = 0;
-  return &mo->next; }
-
-extern struct MapObjDef * get_map_obj_def (struct World * world, char def_id) {
-// Get pointer to the map object definition with id "def_id".
-  struct MapObjDef * d = NULL;
-  for (d = (struct MapObjDef *) world->monster_def; d->id != def_id && 0 != d->next; d = d->next);
-  if (d->id != def_id)
-    for (d = (struct MapObjDef *) world->item_def; d->id != def_id && 0 != d->next; d = d->next);
-  return d; }
+  i->map_obj.type = map_obj_def->id;
+}
+
+
+
+extern void build_map_objects_monsterdata(struct MapObjDef * map_obj_def,
+                                          void * start)
+{
+    struct Monster * m = (struct Monster *) start;
+    m->map_obj.type = map_obj_def->id;
+    struct MonsterDef * md = (struct MonsterDef *) map_obj_def;
+    m->hitpoints = md->hitpoints_start;
+}
+
+
+
+extern struct MapObjDef * get_map_obj_def (struct World * world, char def_id)
+{
+    struct MapObjDef * d = NULL;
+    for (d = (struct MapObjDef *) world->monster_def;
+         d->id != def_id && 0 != d->next;
+         d = d->next);
+    if (d->id != def_id)
+    {
+        for (d = (struct MapObjDef *) world->item_def;
+             d->id != def_id && 0 != d->next;
+             d = d->next);
+    }
+  return d;
+}
diff --git a/src/map_objects.h b/src/map_objects.h
index f39df0d..ebda314 100644
--- a/src/map_objects.h
+++ b/src/map_objects.h
@@ -1,49 +1,122 @@
+/* map_objects.h
+ *
+ * Structs for objects on the map and their type definitions, and routines to
+ * initialize these and load and save them from/to files.
+ */
+
 #ifndef MAP_OBJECTS_H
 #define MAP_OBJECTS_H
 
-#include <stdio.h>
-#include "yx_uint16.h"
 
+
+#include <stdio.h> /* for FILE typedef */
+#include "yx_uint16.h" /* for yx_uint16 coordinates */
 struct World;
 
-struct Player {
-  struct yx_uint16 pos;
-  unsigned char hitpoints; };
-
-struct MapObj {
-  void * next;
-  char type;
-  struct yx_uint16 pos; };
-
-struct MapObjDef {
-  struct MapObjDef * next;
-  char id;
-  char mapchar;
-  char * desc; };
-
-struct Item {
-  struct MapObj map_obj; };
-
-struct Monster {
-  struct MapObj map_obj;
-  unsigned char hitpoints; };
-
-struct ItemDef {
-  struct MapObjDef map_obj_def; };
-
-struct MonsterDef {
-  struct MapObjDef map_obj_def;
-  unsigned char hitpoints_start; };
-
-extern void init_map_object_defs (struct World *, char *);
-extern void write_map_objects_monsterdata (void *, FILE *);
-extern void write_map_objects (void * start, FILE *, void (*) (void *, FILE *) );
-extern void read_map_objects_monsterdata (void *, FILE *);
-extern void read_map_objects (void *, FILE *, size_t, void (*) (void *, FILE *) );
-extern void build_map_objects_monsterdata (struct MapObjDef *, void *);
-extern void build_map_objects_itemdata (struct MapObjDef *, void *);
-extern void * build_map_objects (struct World *, void *, char, unsigned char, size_t,
+
+
+/* Player is non-standard: single and of a hard-coded type. */
+
+struct Player
+{
+    struct yx_uint16 pos;
+    unsigned char hitpoints;
+};
+
+
+
+/* Structs for standard map objects. */
+
+struct MapObj
+{
+    void * next;
+    char type;            /* Map object type identifier (see MapObjDef.id). */
+    struct yx_uint16 pos; /* Coordinate of object on map. */
+};
+
+struct Item
+{
+    struct MapObj map_obj;
+};
+
+struct Monster
+{
+    struct MapObj map_obj;
+    unsigned char hitpoints;
+};
+
+
+
+/* Structs for map object *type* definitions. Values common to all members of
+ * a single monster or item type are harvested from these.
+ */
+
+struct MapObjDef
+{
+    struct MapObjDef * next;
+    char id;      /* Unique identifier of the map object type to describe. */
+    char mapchar; /* Map object symbol to appear on map.*/
+    char * desc;  /* String describing map object in the game log. */
+};
+
+struct ItemDef
+{
+    struct MapObjDef map_obj_def;
+};
+
+struct MonsterDef
+{
+    struct MapObjDef map_obj_def;
+    unsigned char hitpoints_start; /* Hitpoints each monster starts with. */
+};
+
+
+
+/* Initialize map object type definitions from file at path "filename". */
+extern void init_map_object_defs(struct World * world, char * filename);
+
+
+
+/* Build into memory starting at "start" chain of "n" map objects of type
+ * "def_id", pass either "build_map_objects_itemdata" or
+ * "build_map_objects_monsterdata" as "b_typedata"() to build data specific
+ * to monsters or items (or more forms if they ever get invented).
+ *
+ * TODO: function should decide by itself what "b_typedata"() to call based
+ * on monster-or-item info in MapObjDef struct or from a table mapping type
+ * identifiers to these.
+ */
+extern void * build_map_objects(struct World * world, void * start, char def_id,
+                                 unsigned char n, size_t size,
                                  void (*) (struct MapObjDef *, void *));
-extern struct MapObjDef * get_map_obj_def (struct World *, char);
+extern void build_map_objects_itemdata(struct MapObjDef * map_obj_def,
+                                       void * start);
+extern void build_map_objects_monsterdata(struct MapObjDef * map_obj_def,
+                                          void * start);
+
+
+
+/* Write to/read from file chain of map objects starting/to start in memory at
+ * "start", use "w_typedata"()"/"r_typedata" for data specific to monsters
+ * (pass "write_map_objects_monsterdata"/"read_map_objects_itemdata") or items
+ * (currently they have no data specific only to them, so pass NULL). Use "size"
+ * in read_map_objects() to pass the size of structs of the affected map object
+ * type.
+ *
+ * TODO: the size of these structs should not need to be passed but instead be
+ * available via the type id of the affected map object type. The TODO above
+ * towards the function deciding its helper function by itself also applies.
+ */
+extern void write_map_objects(void * start, FILE * file,
+                              void (* w_typedata) (void *, FILE *) );
+extern void read_map_objects(void * start, FILE * file, size_t size,
+                             void (* w_typedata) (void *, FILE *) );
+extern void write_map_objects_monsterdata(void * start, FILE * file);
+extern void read_map_objects_monsterdata( void * start, FILE * file);
+
+
+
+/* Get pointer to the map object definition of identifier "def_id". */
+extern struct MapObjDef * get_map_obj_def(struct World * world, char def_id);
 
 #endif
diff --git a/src/readwrite.c b/src/readwrite.c
index 9dbcac4..40fc63f 100644
--- a/src/readwrite.c
+++ b/src/readwrite.c
@@ -1,8 +1,10 @@
 /* readwrite.c */
 
 #include "readwrite.h"
-#include <stdio.h>
-#include <stdint.h>
+#include <stdio.h> /* for FILE typedef*/
+#include <stdint.h> /* for uint16_t, uint32_t */
+
+
 
 extern uint16_t read_uint16_bigendian(FILE * file)
 {
@@ -12,6 +14,8 @@ extern uint16_t read_uint16_bigendian(FILE * file)
     return x;
 }
 
+
+
 extern uint32_t read_uint32_bigendian(FILE * file)
 {
     uint32_t x;
@@ -22,12 +26,16 @@ extern uint32_t read_uint32_bigendian(FILE * file)
     return x;
 }
 
+
+
 extern void write_uint16_bigendian(uint16_t x, FILE * file)
 {
     fputc( x >> 8,   file );
     fputc( x & 0xFF, file );
 }
 
+
+
 extern void write_uint32_bigendian(uint32_t x, FILE * file)
 {
     fputc(   x >> 24,          file);
diff --git a/src/readwrite.h b/src/readwrite.h
index 84085d2..a0c8dba 100644
--- a/src/readwrite.h
+++ b/src/readwrite.h
@@ -1,14 +1,18 @@
-/*  readwrite.h:
+/* readwrite.h:
  *
- *  Routines for reading/writing multibyte data from/to files. They ensure a
- *  defined endianness.
+ * Routines for reading/writing multibyte data from/to files. They ensure a
+ * defined endianness.
  */
 
 #ifndef READWRITE_H
 #define READWRITE_H
 
-#include <stdio.h>
-#include <stdint.h>
+
+
+#include <stdio.h> /* for FILE typedef */
+#include <stdint.h> /* for uint16_t, uint32_t */
+
+
 
 extern uint16_t read_uint16_bigendian(FILE * file);
 extern uint32_t read_uint32_bigendian(FILE * file);
diff --git a/src/yx_uint16.c b/src/yx_uint16.c
index 8fb41bf..2d7503b 100644
--- a/src/yx_uint16.c
+++ b/src/yx_uint16.c
@@ -1,6 +1,10 @@
 /* yx_uint16.c */
 
-#include "yx_uint16.h"
+
+
+#include "yx_uint16.h" /* for uint16_t */
+
+
 
 extern char yx_uint16_cmp(struct yx_uint16 a, struct yx_uint16 b)
 {
@@ -10,6 +14,8 @@ extern char yx_uint16_cmp(struct yx_uint16 a, struct yx_uint16 b)
         return 0;
 }
 
+
+
 extern struct yx_uint16 mv_yx_in_dir(enum dir d, struct yx_uint16 yx)
 {
     if      (d == NORTH)
diff --git a/src/yx_uint16.h b/src/yx_uint16.h
index eb951a7..29298e5 100644
--- a/src/yx_uint16.h
+++ b/src/yx_uint16.h
@@ -1,13 +1,17 @@
-/*  yx_uint16.h
+/* yx_uint16.h
  *
- *  Structs and routines for coordinates and movement in 2-dimensional space
- *  (such as the ncurses screen and game maps).
+ * Structs and routines for coordinates and movement in 2-dimensional space
+ * (such as the ncurses screen and game maps).
  */
 
 #ifndef YX_UINT16_H
 #define YX_UINT16_H
 
-#include <stdint.h>
+
+
+#include <stdint.h> /* for uint16_t */
+
+
 
 /* Coordinates for maps of max. 65536x65536 cells. */
 struct yx_uint16
@@ -16,14 +20,13 @@ struct yx_uint16
     uint16_t x;
 };
 
-/* This encodes directions. */
-
+/* Directions available for movement. */
 enum dir
 {
     NORTH = 1,
-    EAST  = 2,
-    SOUTH = 3,
-    WEST  = 4
+    EAST,
+    SOUTH,
+    WEST
 };
 
 /* Return 1 if two yx_uint16 coordinates a and b are equal, else 0. */