added more functionalities to kvec

kvec.h

@@ -49,6 +49,7 @@ int main() {
 #define AC_KVEC_H
 
 #include <stdlib.h>
+#include <string.h>
 
 #define kv_roundup32(x) (--(x), (x)|=(x)>>1, (x)|=(x)>>2, (x)|=(x)>>4, (x)|=(x)>>8, (x)|=(x)>>16, ++(x))
 
@@ -60,7 +61,7 @@ int main() {
 #define kv_size(v) ((v).n)
 #define kv_max(v) ((v).m)
 
-#define kv_resize(type, v, s)  ((v).m = (s), (v).a = (type*)realloc((v).a, sizeof(type) * (v).m))
+#define kv_resize(type, v, s)  ((v).m = (s), (v).n = (v).n > (s)? s : (v).n, (v).a = (type*)realloc((v).a, sizeof(type) * (v).m))
 
 #define kv_copy(type, v1, v0) do {							\
 		if ((v1).m < (v0).n) kv_resize(type, v1, (v0).n);	\
@@ -87,4 +88,36 @@ int main() {
 						  : (v).n <= (size_t)(i)? (v).n = (i) + 1 \
 						  : 0), (v).a[(i)])
 
+#define kv_p(type, v) ((((v).n < ((v).m >> 2))?\
+                         ((v).m >>= 1,\
+                          (v).a = (type*)realloc((v).a, sizeof(type) * (v).m), 0)\
+                        : 0),\
+                        (v).a[--(v).n])
+
+#define kv_insert(type, v, i, x) do {\
+        if ((v).m == (v).n) {\
+			(v).m = (v).m? (v).m<<1 : 2;\
+			(v).a = (type*)realloc((v).a, sizeof(type) * (v).m);\
+        }\
+        if ((v).m <= (size_t)(i)) {\
+            (v).m = (v).n = (i) + 1;\
+            kv_roundup32((v).m);\
+            (v).a = (type*)realloc((v).a, sizeof(type) * (v).m);\
+        } else if ((v).n <= (size_t)(i)) {\
+            (v).n = (i) + 1;\
+        } else {++(v).n;}\
+        memmove((v).a + i + 1, (v).a + i, sizeof(type) * ((v).n - i - 1));\
+        (v).a[(i)] = x;\
+    } while(0)
+
+#define kv_remove(type, v, i) do {\
+        if (i < (v).n) {\
+            if (--(v).n < ((v).m >> 2)) {\
+                (v).m >>= 1;\
+                (v).a = (type*)realloc((v).a, sizeof(type) * (v).m);\
+            }\
+            memmove((v).a + i, (v).a + i + 1, sizeof(type) * ((v).n - i));\
+        }\
+    } while(0)
+
 #endif