+/* src/server/configfile.c */
+
+#define _POSIX_C_SOURCE 200809L /* strdup() */
+#include <stddef.h> /* size_t, NULL */
+#include <stdio.h> /* FILE, sprintf() */
+#include <stdint.h> /* uint8_t, uint32_t */
+#include <stdlib.h> /* atoi(), free() */
+#include <string.h> /* strchr(), strcmp(), strdup(), strlen() */
+#include <unistd.h> /* access(), F_OK */
+#include "../common/err_try_fgets.h" /* err_line(), err_try_fgets(),
+ * reset_err_try_fgets_counter()
+ */
+#include "../common/readwrite.h" /* try_fopen(),try_fclose(),textfile_width() */
+#include "../common/rexit.h" /* exit_err() */
+#include "../common/try_malloc.h" /* try_malloc() */
+#include "cleanup.h" /* set_cleanup_flag(), CLEANUP_MAP_OBJ_DEFS,
+ * CLEANUP_MAP_OBJ_ACTS
+ */
+#include "map_object_actions.h" /* struct MapObjAct */
+#include "map_objects.h" /* struct MapObj, struct MapObjDef */
+#include "world.h" /* world global */
+
+
+
+/* Flags defining state of object and action entry reading ((un-)finished, ready
+ * for starting the reading of a new definition etc.
+ */
+enum flag
+{
+ EDIT_STARTED = 0x01,
+ NAME_SET = 0x02,
+ EFFORT_SET = 0x04,
+ CORPSE_ID_SET = 0x04,
+ SYMBOL_SET = 0x08,
+ LIFEPOINTS_SET = 0x10,
+ CONSUMABLE_SET = 0x20,
+ READY_ACT = NAME_SET | EFFORT_SET,
+ READY_OBJ = NAME_SET | CORPSE_ID_SET | SYMBOL_SET | LIFEPOINTS_SET
+ | CONSUMABLE_SET
+};
+
+
+
+/* What MapObjDef and MapObjAct structs have in common at their top. Used to
+ * have common functions run over structs of both types.
+ */
+struct EntryHead
+{
+ uint8_t id;
+ struct EntryHead * next;
+};
+
+
+
+/* Many functions working on config file lines / tokens work with these elements
+ * that only change on line change. Makes sense to pass them over together.
+ */
+struct Context {
+ char * line;
+ char * token0;
+ char * token1;
+ char * err_pre;
+};
+
+
+
+/* Return next token from "line" or NULL if none is found. Tokens either a)
+ * start at the first non-whitespace character and end before the next
+ * whitespace character after that; or b) if the first non-whitespace character
+ * is a single quote followed by at least one other single quote some time later
+ * on the line, the token starts after that first single quote and ends before
+ * the second, with the next token_from_line() call starting its token search
+ * after that second quote. The only way to return an empty string (instead of
+ * NULL) as a token is to delimit the token by two succeeding single quotes.
+ * */
+static char * token_from_line(char * line);
+
+/* Determines the end of the token_from_line() token. */
+static void set_token_end(char ** start, char ** limit_char);
+
+/* Get tokens from "context" and, by their order (in the individual context and
+ * in subsequent calls of this function), interpret them as data to write into
+ * the MapObjAct / MapObjDef DB.
+ *
+ * Individual MapObjDef / MapObjAct DB entries are put together line by line
+ * before being written. Writing only happens after all necessary members of an
+ * entry have been assembled, and when additionally a) a new entry is started by
+ * a context->token0 of "ACTION" or "OBJECT"; or b) a NULL context->token0 is
+ * passed. This is interpreted as the end of the MapObjDef / MapObjAct DB read,
+ * so the appropriate cleanup flags are set and test_corpse_ids() is called.
+ */
+static void tokens_into_entries(struct Context * context);
+
+/* Start reading a new DB entry of "size" from tokens in "context" if ->token0
+ * matches "comparand". Set EDIT_STARTED in "flags" to mark beginning of new
+ * entry reading. Check that id of new entry in ->token1 has not already been
+ * used in DB starting at "entry_cmp".
+ */
+static uint8_t new_entry(struct Context * context, char * comparand,
+ enum flag * flags, size_t size,
+ struct EntryHead ** entry,
+ struct EntryHead * entry_cmp);
+
+/* Write DB entry pointed to by "entry" to its appropriate location. */
+static void write_if_entry(struct EntryHead ** entry,
+ struct EntryHead *** entry_p_p_p);
+
+/* Ensure that all .corpse_id members in the MapObjDef DB fit .id members of
+ * MapObjDef DB entries.
+ */
+static void test_corpse_ids();
+
+/* Try to read tokens in "context" as members for the entry currently edited,
+ * which must be either "mod" or "moa". What member of which of the two is set
+ * depends on which of "object_flags" and "action_flags" has EDIT_STARTED set
+ * and on the key name of ->token0. Return 1 if interpretation succeeds, else 0.
+ *
+ * Note that MapObjAct entries' .name also determines their .func.
+ */
+static uint8_t set_members(struct Context * context, enum flag * object_flags,
+ enum flag * action_flags, struct MapObjDef * mod,
+ struct MapObjAct * moa);
+
+/* If "context"->token0 fits "comparand", set "element" to value read from
+ * ->token1 as either string (type: "s"), char ("c") or uint8 ("8"), set
+ * that element's flag to "flags" and return 1; else return 0.
+ */
+static uint8_t set_val(struct Context * context, char * comparand,
+ enum flag * flags, enum flag set_flag, char type,
+ char * element);
+
+/* Writes "context"->token1 to "target" only if it describes a proper uint8. */
+static void set_uint8(struct Context * context, uint8_t * target);
+
+/* If "name" fits "moa"->name, set "moa"->func to "func". (Derives MapObjAct
+ * .func from .name for set_members().
+ */
+static uint8_t try_func_name(struct MapObjAct * moa,
+ char * name, void (* func) (struct MapObj *));
+
+
+
+static char * token_from_line(char * line)
+{
+ static char * final_char = NULL;
+ static char * limit_char = NULL;
+ char * start = limit_char + 1;
+ if (line)
+ {
+ start = line;
+ limit_char = start;
+ final_char = &(line[strlen(line)]);
+ if ('\n' == *(final_char - 1))
+ {
+ *(--final_char) = '\0';
+ }
+ }
+ uint8_t empty = 1;
+ uint32_t i;
+ for (i = 0; '\0' != start[i]; i++)
+ {
+ if (' ' != start[i] && '\t' != start[i])
+ {
+ start = &start[i];
+ empty = 0;
+ break;
+ }
+ }
+ if (empty)
+ {
+ return start = NULL;
+ }
+ set_token_end(&start, &limit_char);
+ return start;
+}
+
+
+
+static void set_token_end(char ** start, char ** limit_char)
+{
+ char * end_quote = ('\'' == (*start)[0]) ? strchr(*start + 1, '\'') : NULL;
+ *start = (end_quote) ? *start + 1 : *start;
+ if (end_quote)
+ {
+ *end_quote = '\0';
+ *limit_char = end_quote;
+ return;
+ }
+ char * space = strchr(*start, ' ');
+ char * tab = strchr(*start, '\t');
+ space = (!space || (tab && tab < space)) ? tab : space;
+ if (space)
+ {
+ * space = '\0';
+ }
+ *limit_char = strchr(*start, '\0');
+}
+
+
+
+static void tokens_into_entries(struct Context * context)
+{
+ char * str_act = "ACTION";
+ char * str_obj = "OBJECT";
+ static struct MapObjAct ** moa_p_p = &world.map_obj_acts;
+ static struct MapObjDef ** mod_p_p = &world.map_obj_defs;
+ static enum flag action_flags = READY_ACT;
+ static enum flag object_flags = READY_OBJ;
+ static struct EntryHead * moa = NULL;
+ static struct EntryHead * mod = NULL;
+ if ( !context->token0
+ || !strcmp(context->token0,str_act) || !strcmp(context->token0,str_obj))
+ {
+ char * err_fin = "Last definition block not finished yet.";
+ err_line((action_flags & READY_ACT) ^ READY_ACT,
+ context->line, context->err_pre, err_fin);
+ err_line((object_flags & READY_OBJ) ^ READY_OBJ,
+ context->line, context->err_pre, err_fin);
+ object_flags = action_flags = READY_OBJ;
+ write_if_entry(&moa, (struct EntryHead ***) &moa_p_p);
+ write_if_entry(&mod, (struct EntryHead ***) &mod_p_p);
+ }
+ if (!context->token0)
+ {
+ set_cleanup_flag(CLEANUP_MAP_OBJECT_ACTS | CLEANUP_MAP_OBJECT_DEFS);
+ test_corpse_ids();
+ return;
+ }
+ if (!( new_entry(context, str_act, &action_flags,
+ sizeof(struct MapObjAct), (struct EntryHead**) &moa,
+ (struct EntryHead *) world.map_obj_acts)
+ || new_entry(context, str_obj, &object_flags,
+ sizeof(struct MapObjDef), (struct EntryHead**) &mod,
+ (struct EntryHead *) world.map_obj_defs)
+ || set_members(context, &object_flags, &action_flags,
+ (struct MapObjDef *) mod, (struct MapObjAct *) moa)))
+ {
+ err_line(1, context->line, context->err_pre, "Unknown argument");
+ }
+}
+
+
+
+static uint8_t new_entry(struct Context * context, char * comparand,
+ enum flag * flags, size_t size,
+ struct EntryHead ** entry,struct EntryHead * entry_cmp)
+{
+ char * f_name = "new_entry()";
+ char * err_uni = "Declaration of ID already used.";
+ if (!strcmp(context->token0, comparand))
+ {
+ * flags = EDIT_STARTED;
+ * entry = try_malloc(size, f_name);
+ set_uint8(context, &((*entry)->id));
+ for (; NULL != entry_cmp; entry_cmp = entry_cmp->next)
+ {
+ err_line((*entry)->id == entry_cmp->id,
+ context->line, context->err_pre, err_uni);
+ }
+ return 1;
+ }
+ return 0;
+}
+
+
+
+static void write_if_entry(struct EntryHead ** entry,
+ struct EntryHead *** entry_p_p_p)
+{
+ if (*entry)
+ {
+ (* entry)->next = NULL;
+ ** entry_p_p_p = *entry;
+ * entry_p_p_p = &((*entry)->next);
+ * entry = NULL; /* So later runs of this don't re-append same entry. */
+ }
+}
+
+
+
+static void test_corpse_ids()
+{
+ char * f_name = "test_corpse_ids()";
+ char * err_corpse_prefix = "In the object definition DB, one object corpse "
+ "ID does not reference any known object in the "
+ "DB. ID of responsible object: ";
+ char * err_corpse = try_malloc(strlen(err_corpse_prefix) + 3 + 1, f_name);
+ struct MapObjDef * test_entry_0 = world.map_obj_defs;
+ for (; test_entry_0; test_entry_0 = test_entry_0->next)
+ {
+ uint8_t corpse_id_found = 0;
+ struct MapObjDef * test_entry_1 = world.map_obj_defs;
+ for (; test_entry_1; test_entry_1 = test_entry_1->next)
+ {
+ if (test_entry_0->corpse_id == test_entry_1->id)
+ {
+ corpse_id_found = 1;
+ }
+ }
+ sprintf(err_corpse, "%s%d", err_corpse_prefix, test_entry_0->id);
+ exit_err(!corpse_id_found, err_corpse);
+ }
+ free(err_corpse);
+}
+
+
+
+static uint8_t set_members(struct Context * context, enum flag * object_flags,
+ enum flag * action_flags, struct MapObjDef * mod,
+ struct MapObjAct * moa)
+{
+ if ( * action_flags & EDIT_STARTED
+ && set_val(context, "NAME", action_flags,
+ NAME_SET, 's', (char *) &moa->name))
+ {
+ if (!( try_func_name(moa, "move", actor_move)
+ || try_func_name(moa, "pick_up", actor_pick)
+ || try_func_name(moa, "drop", actor_drop)
+ || try_func_name(moa, "use", actor_use)))
+ {
+ moa->func = actor_wait;
+ }
+ *action_flags = *action_flags | NAME_SET;
+ return 1;
+ }
+ else if ( set_val(context, "NAME", object_flags,
+ NAME_SET, 's', (char *) &mod->name)
+ || set_val(context, "SYMBOL", object_flags,
+ SYMBOL_SET, 'c', (char *) &mod->char_on_map)
+ || set_val(context, "EFFORT", action_flags,
+ EFFORT_SET, '8', (char *) &moa->effort)
+ || set_val(context, "LIFEPOINTS", object_flags,
+ LIFEPOINTS_SET, '8', (char *) &mod->lifepoints)
+ || set_val(context, "CONSUMABLE", object_flags,
+ CONSUMABLE_SET, '8', (char *) &mod->consumable)
+ || set_val(context, "CORPSE_ID", object_flags,
+ CORPSE_ID_SET, '8', (char *) &mod->corpse_id))
+ {
+ return 1;
+ }
+ return 0;
+}
+
+
+
+static uint8_t set_val(struct Context * context, char * comparand,
+ enum flag * flags, enum flag set_flag, char type,
+ char * element)
+{
+ char * err_out = "Outside appropriate definition's context.";
+ char * err_singlechar = "Value must be single ASCII character.";
+ if (!strcmp(context->token0, comparand))
+ {
+ err_line(!(* flags & EDIT_STARTED),
+ context->line, context->err_pre, err_out);
+ * flags = * flags | set_flag;
+ if ('s' == type)
+ {
+ * (char **) element = strdup(context->token1);
+ }
+ else if ('c' == type)
+ {
+ err_line(1 != strlen(context->token1),
+ context->line, context->err_pre, err_singlechar);
+ * element = (context->token1)[0];
+ }
+ else if ('8' == type)
+ {
+ set_uint8(context, (uint8_t *) element);
+ }
+ return 1;
+ }
+ return 0;
+}
+
+
+
+static void set_uint8(struct Context * context, uint8_t * target)
+{
+ char * err_uint8 = "Value not unsigned decimal number between 0 and 255.";
+ uint8_t i;
+ uint8_t is_uint8 = 1;
+ for (i = 0; '\0' != context->token1[i]; i++)
+ {
+ if (i > 2 || '0' > context->token1[i] || '9' < context->token1[i])
+ {
+ is_uint8 = 0;
+ }
+ }
+ if (is_uint8 && atoi(context->token1) > UINT8_MAX)
+ {
+ is_uint8 = 0;
+ }
+ err_line(!(is_uint8), context->line, context->err_pre, err_uint8);
+ *target = atoi(context->token1);
+}
+
+
+
+static uint8_t try_func_name(struct MapObjAct * moa,
+ char * name, void (* func) (struct MapObj *))
+{
+ if (0 == strcmp(moa->name, name))
+ {
+ moa->func = func;
+ return 1;
+ }
+ return 0;
+}
+
+
+
+extern void read_config_file() {
+ char * f_name = "read_new_config_file()";
+ char * path = world.path_config;
+ struct Context context;
+ char * err_pre_prefix = "Failed reading config file: \"";
+ char * err_pre_affix = "\". ";
+ context.err_pre = try_malloc(strlen(err_pre_prefix) + strlen(path)
+ + strlen(err_pre_affix) + 1, f_name);
+ sprintf(context.err_pre, "%s%s%s", err_pre_prefix, path, err_pre_affix);
+ exit_err(access(path, F_OK), context.err_pre);
+ FILE * file = try_fopen(path, "r", f_name);
+ uint32_t linemax = textfile_width(file);
+ context.line = try_malloc(linemax + 1, f_name);
+ reset_err_try_fgets_counter();
+ err_line(0 == linemax, context.line, context.err_pre, "File is empty.");
+ context.token0 = NULL; /* For tokens_into_entries() if while() stagnates. */
+ char * err_val = "No value given.";
+ char * err_many = "Too many values.";
+ while (err_try_fgets(context.line, linemax + 1, file, context.err_pre, ""))
+ {
+ char * line_copy = strdup(context.line);
+ context.token0 = token_from_line(line_copy);
+ if (context.token0)
+ {
+ err_line(0 == (context.token1 = token_from_line(NULL)),
+ context.line, context.err_pre, err_val);
+ err_line(NULL != token_from_line(NULL),
+ context.line, context.err_pre, err_many);
+ tokens_into_entries(&context);
+ context.token0 = NULL;
+ }
+ free(line_copy);
+ }
+ tokens_into_entries(&context);
+ try_fclose(file, f_name);
+ free(context.line);
+ free(context.err_pre);
+}