Commands are now to be managed by a Command DB, not by passing around arbitrary strings.

[plomrogue] / src / command_db.c

diff --git a/src/command_db.c b/src/command_db.c
new file mode 100644 (file)
index 0000000..cbf6959
--- /dev/null
+++ b/src/command_db.c
@@ -0,0 +1,83 @@
+/* command.c */
+
+#include "command_db.h"
+#include <stdlib.h> /* for malloc() */
+#include <stdio.h> /* for FILE typedef, fopen(), fclose(), fgets() */
+#include <stdint.h> /* for uint8_t */
+#include <string.h> /* for strlen(), strtok() */
+#include "main.h" /* for World struct */
+#include "rexit.h" /* for exit_err() */
+#include "misc.h" /* for textfile_sizes() */
+
+
+
+/* Build string pointed to by "ch_ptr" from next token delimited by "delim",
+ * exit_err() with "err" as error message on malloc() failure.
+ */
+static void copy_tokenized_string(struct World * world,
+                                 char ** ch_ptr, char * delim, char * err)
+{
+    char * dsc_ptr = strtok(NULL, delim);
+    * ch_ptr = malloc(strlen(dsc_ptr) + 1);
+    exit_err(NULL == * ch_ptr, world, err);
+    memcpy(* ch_ptr, dsc_ptr, strlen(dsc_ptr) + 1);
+}
+
+
+
+extern char * get_command_longdsc(struct World * world, char * dsc_short)
+{
+    struct Command * cmd_ptr = world->cmd_db->cmds;
+    while (1)
+    {
+        if (0 == strcmp(dsc_short, cmd_ptr->dsc_short))
+        {
+            return cmd_ptr->dsc_long;
+        }
+        cmd_ptr = &cmd_ptr[1];
+    }
+}
+
+
+
+extern void init_command_db(struct World * world)
+{
+    char * err = "Trouble in init_cmds() with fopen() on file 'commands'.";
+    FILE * file = fopen("config/commands", "r");
+    exit_err(NULL == file, world, err);
+    uint16_t lines, linemax;
+    textfile_sizes(file, &linemax, &lines);
+    err = "Trouble in init_cmds() with malloc().";
+    char * line = malloc(linemax);
+    exit_err(NULL == line, world, err);
+    struct Command * cmds = malloc(lines * sizeof(struct Command));
+    exit_err(NULL == line, world, err);
+    uint8_t i = 0;
+    while (fgets(line, linemax, file))
+    {
+        cmds[i].id = atoi(strtok(line, " "));
+        copy_tokenized_string(world, &cmds[i].dsc_short, " ", err);
+        copy_tokenized_string(world, &cmds[i].dsc_long, "\n", err);
+        i++;
+    }
+    world->cmd_db = malloc(sizeof(struct CommandDB));
+    world->cmd_db->cmds = cmds;
+    world->cmd_db->n = lines;
+    err = "Trouble in init_cmds() with fclose() on file 'commands'.";
+    exit_err(fclose(file), world, err);
+}
+
+
+
+extern void free_command_db(struct World * world)
+{
+    uint8_t i = 0;
+    while (i < world->cmd_db->n)
+    {
+        free(world->cmd_db->cmds[i].dsc_short);
+        free(world->cmd_db->cmds[i].dsc_long);
+        i++;
+    }
+    free(world->cmd_db->cmds);
+    free(world->cmd_db);
+}