X-Git-Url: https://git.danieliu.xyz/?a=blobdiff_plain;f=include%2Fcstack.h;h=18608f397eb1735bcb0e0103030b9b70ae0370c8;hb=c3bcbda5c26b9234b6207b4c6fb85ab1565d9d0b;hp=edb98475d1930b16d6a75760c4020f352f56bb02;hpb=584bba9e9357ff7adc0fcedf75fb098c359abb33;p=smdp.git

diff --git a/include/cstack.h b/include/cstack.h
index edb9847..18608f3 100644
--- a/include/cstack.h
+++ b/include/cstack.h
@@ -1,22 +1,62 @@
 #if !defined( CSTACK_H )
 #define CSTACK_H
 
+/*
+ * An implementation of a char stack in heap memory.
+ * Copyright (C) 2018 Michael Goehler
+ *
+ * This file is part of mdp.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ *
+ * struct: cstack_t which defines char stack type in heap memory
+ *
+ * function: cstack_init to initialize struct of type cstack_t
+ * function: cstack_t->push to add one char on top of the stack
+ * function: cstack_t->pop to remove the top char from the stack
+ * function: cstack_t->top to test if the top char is a given char
+ * function: cstack_t->empty to test if the stack is empty
+ * function: cstack_t->delete to free the allocated memory
+ *
+ * Example:
+ *      cstack_t *p = cstack_init();
+ *      (p->push)(p, 'X');
+ *      printf("%c\n", (p->pop)(p));
+ *      (p->delete)(p);
+ *
+ */
+
+#include "common.h"
+
 typedef struct _cstack_t {
-    char *content;
+    wchar_t *content;
     size_t alloc;
     size_t size;
     int head;
-    void (*push)(struct _cstack_t *self, char c);
-    char (*pop)(struct _cstack_t *self);
-    char (*top)(struct _cstack_t *self);
-    int (*empty)(struct _cstack_t *self);
+    void (*push)(struct _cstack_t *self, wchar_t c);
+    wchar_t (*pop)(struct _cstack_t *self);
+    bool (*top)(struct _cstack_t *self, wchar_t c);
+    bool (*empty)(struct _cstack_t *self);
     void (*delete)(struct _cstack_t *self);
 } cstack_t;
 
-void cstack_push(cstack_t *self, char c);
-char cstack_pop(cstack_t *self);
-char cstack_top(cstack_t *self);
-int cstack_empty(cstack_t *self);
+cstack_t *cstack_init();
+void cstack_push(cstack_t *self, wchar_t c);
+wchar_t cstack_pop(cstack_t *self);
+bool cstack_top(cstack_t *self, wchar_t c);
+bool cstack_empty(cstack_t *self);
 void cstack_delete(cstack_t *self);
 
-#endif // !defined( CSTACK_H )
\ No newline at end of file
+#endif // !defined( CSTACK_H )