From bdd26d4dde3b3d3180619cc81622081025ca6cb5 Mon Sep 17 00:00:00 2001
From: FreeBirdLjj <ljj11011@mail.ustc.edu.cn>
Date: Sun, 5 Oct 2014 00:23:09 +0800
Subject: [PATCH 1/1] Add support for bool type.

---
 include/common.h | 17 +++++++++++++++++
 include/cstack.h | 10 ++++++----
 include/parser.h |  2 +-
 src/cstack.c     |  8 +++-----
 src/parser.c     |  4 ++--
 5 files changed, 29 insertions(+), 12 deletions(-)

diff --git a/include/common.h b/include/common.h
index 99c4382..1e4c07a 100644
--- a/include/common.h
+++ b/include/common.h
@@ -26,6 +26,23 @@
  *
  */
 
+#if defined( __STDC__ )  // for standard C compiler
+#if __STDC_VERSION__ >= 199901L    // for C99 and later
+#include <stdbool.h>
+#else    // __STDC_VERSION__ >= 199901L
+#if !defined( bool )
+typedef enum {
+    false = 0,
+    true
+} bool;
+#endif   // !defined( bool )
+#endif   // __STDC_VERSION__ >= 199901L
+#else    // defined( __STDC__ )
+#define bool    int
+#define true    1
+#define false   0
+#endif   // defined( __STDC__ )
+
 #define MAX(a, b) ({ typeof(a) _a = a; typeof(b) _b = b; _a > _b? _a : _b; })
 #define MIN(a, b) ({ typeof(a) _a = a; typeof(b) _b = b; _a < _b? _a : _b; })
 
diff --git a/include/cstack.h b/include/cstack.h
index bea73a6..fd6c60d 100644
--- a/include/cstack.h
+++ b/include/cstack.h
@@ -38,6 +38,8 @@
  *
  */
 
+#include "common.h"
+
 typedef struct _cstack_t {
     char *content;
     size_t alloc;
@@ -45,16 +47,16 @@ typedef struct _cstack_t {
     int head;
     void (*push)(struct _cstack_t *self, char c);
     char (*pop)(struct _cstack_t *self);
-    int (*top)(struct _cstack_t *self, char c);
-    int (*empty)(struct _cstack_t *self);
+    bool (*top)(struct _cstack_t *self, char c);
+    bool (*empty)(struct _cstack_t *self);
     void (*delete)(struct _cstack_t *self);
 } cstack_t;
 
 cstack_t *cstack_init();
 void cstack_push(cstack_t *self, char c);
 char cstack_pop(cstack_t *self);
-int cstack_top(cstack_t *self, char c);
-int cstack_empty(cstack_t *self);
+bool cstack_top(cstack_t *self, char c);
+bool cstack_empty(cstack_t *self);
 void cstack_delete(cstack_t *self);
 
 #endif // !defined( CSTACK_H )
diff --git a/include/parser.h b/include/parser.h
index 4eb9dfe..99f68ff 100644
--- a/include/parser.h
+++ b/include/parser.h
@@ -45,7 +45,7 @@
 deck_t *markdown_load(FILE *input);
 int markdown_analyse(cstring_t *text);
 void markdown_debug(deck_t *deck, int debug);
-int is_utf8(char ch);
+bool is_utf8(char ch);
 int length_utf8(char ch);
 int next_nonblank(cstring_t *text, int i);
 int prev_blank(cstring_t *text, int i);
diff --git a/src/cstack.c b/src/cstack.c
index 31611c2..4763b5b 100644
--- a/src/cstack.c
+++ b/src/cstack.c
@@ -59,13 +59,11 @@ char cstack_pop(cstack_t *self) {
     return self->content[self->head--];
 }
 
-int cstack_top(cstack_t *self, char c) {
-    if(self->head >= 0 && self->content[self->head] == c)
-        return 1;
-    return 0;
+bool cstack_top(cstack_t *self, char c) {
+    return self->head >= 0 && self->content[self->head] == c;
 }
 
-int cstack_empty(cstack_t *self) {
+bool cstack_empty(cstack_t *self) {
     return self->head == -1;
 }
 
diff --git a/src/parser.c b/src/parser.c
index 6294500..ce3f702 100644
--- a/src/parser.c
+++ b/src/parser.c
@@ -478,8 +478,8 @@ void markdown_debug(deck_t *deck, int debug) {
     }
 }
 
-int is_utf8(char ch) {
-    return (ch & 0x80);
+bool is_utf8(char ch) {
+    return (ch & 0x80) != 0x00;
 }
 
 int length_utf8(char ch) {
-- 
2.20.1