From cc53777cc31b42ca37d9acc8bcbd7d6a6e7af7b0 Mon Sep 17 00:00:00 2001
From: jiaoqiyuan <jiaoqiyuan@outlook.com>
Date: Tue, 8 Jun 2021 16:22:25 +0800
Subject: [PATCH 1/2] init array before use it.

---
 src/kit/taosdemo/taosdemo.c  | 2 +-
 tests/examples/c/apitest.c   | 9 ++++-----
 tests/examples/c/demo.c      | 2 +-
 tests/examples/c/prepare.c   | 2 +-
 tests/examples/c/subscribe.c | 3 +--
 5 files changed, 8 insertions(+), 10 deletions(-)

diff --git a/src/kit/taosdemo/taosdemo.c b/src/kit/taosdemo/taosdemo.c
index 6f5d407a73..4d27805685 100644
--- a/src/kit/taosdemo/taosdemo.c
+++ b/src/kit/taosdemo/taosdemo.c
@@ -1209,7 +1209,6 @@ static void fetchResult(TAOS_RES *res, threadInfo* pThreadInfo) {
   }
 
   int   totalLen = 0;
-  char  temp[16000];
 
   // fetch the records row by row
   while((row = taos_fetch_row(res))) {
@@ -1220,6 +1219,7 @@ static void fetchResult(TAOS_RES *res, threadInfo* pThreadInfo) {
         memset(databuf, 0, 100*1024*1024);
     }
     num_rows++;
+    char temp[16000] = {0};
     int len = taos_print_row(temp, row, fields, num_fields);
     len += sprintf(temp + len, "\n");
     //printf("query result:%s\n", temp);
diff --git a/tests/examples/c/apitest.c b/tests/examples/c/apitest.c
index 2961750efc..a482e2902e 100644
--- a/tests/examples/c/apitest.c
+++ b/tests/examples/c/apitest.c
@@ -86,7 +86,7 @@ static int print_result(TAOS_RES* res, int blockFetch) {
     }
   } else {
     while ((row = taos_fetch_row(res))) {
-      char temp[256];
+      char temp[256] = {0};
       taos_print_row(temp, row, fields, num_fields);
       puts(temp);
       nRows++;
@@ -389,10 +389,10 @@ void verify_prepare(TAOS* taos) {
   int         rows = 0;
   int         num_fields = taos_num_fields(result);
   TAOS_FIELD *fields = taos_fetch_fields(result);
-  char        temp[256];
 
   // fetch the records row by row
   while ((row = taos_fetch_row(result))) {
+    char temp[256] = {0};
     rows++;
     taos_print_row(temp, row, fields, num_fields);
     printf("%s\n", temp);
@@ -606,10 +606,10 @@ void verify_prepare2(TAOS* taos) {
   int         rows = 0;
   int         num_fields = taos_num_fields(result);
   TAOS_FIELD *fields = taos_fetch_fields(result);
-  char        temp[256];
 
   // fetch the records row by row
   while ((row = taos_fetch_row(result))) {
+    char temp[256] = {0};
     rows++;
     taos_print_row(temp, row, fields, num_fields);
     printf("%s\n", temp);
@@ -856,8 +856,7 @@ void verify_prepare3(TAOS* taos) {
 
   // fetch the records row by row
   while ((row = taos_fetch_row(result))) {
-    memset(temp, 0, sizeof(temp)/sizeof(temp[0]));
-
+    char temp[256] = {0};
     rows++;
     taos_print_row(temp, row, fields, num_fields);
     printf("%s\n", temp);
diff --git a/tests/examples/c/demo.c b/tests/examples/c/demo.c
index 0b1cd7b5d2..f8c69d0043 100644
--- a/tests/examples/c/demo.c
+++ b/tests/examples/c/demo.c
@@ -116,12 +116,12 @@ void Test(TAOS *taos, char *qstr, int index)  {
   int         rows = 0;
   int         num_fields = taos_field_count(result);
   TAOS_FIELD *fields = taos_fetch_fields(result);
-  char        temp[1024];
 
   printf("num_fields = %d\n", num_fields);
   printf("select * from table, result:\n");
   // fetch the records row by row
   while ((row = taos_fetch_row(result))) {
+    char temp[1024] = {0};
     rows++;
     taos_print_row(temp, row, fields, num_fields);
     printf("%s\n", temp);
diff --git a/tests/examples/c/prepare.c b/tests/examples/c/prepare.c
index 13d71beea6..723b340a92 100644
--- a/tests/examples/c/prepare.c
+++ b/tests/examples/c/prepare.c
@@ -184,10 +184,10 @@ int main(int argc, char *argv[])
   int         rows = 0;
   int         num_fields = taos_num_fields(result);
   TAOS_FIELD *fields = taos_fetch_fields(result);
-  char        temp[256];
 
   // fetch the records row by row
   while ((row = taos_fetch_row(result))) {
+    char temp[256] = {0};
     rows++;
     taos_print_row(temp, row, fields, num_fields);
     printf("%s\n", temp);
diff --git a/tests/examples/c/subscribe.c b/tests/examples/c/subscribe.c
index 1d3533fa5e..ad12f0e7a5 100644
--- a/tests/examples/c/subscribe.c
+++ b/tests/examples/c/subscribe.c
@@ -14,8 +14,6 @@ void print_result(TAOS_RES* res, int blockFetch) {
   int         num_fields = taos_num_fields(res);
   TAOS_FIELD* fields = taos_fetch_fields(res);
   int         nRows = 0;
-  char        buf[4096];
-
   
   if (blockFetch) {
     nRows = taos_fetch_block(res, &row);
@@ -25,6 +23,7 @@ void print_result(TAOS_RES* res, int blockFetch) {
     //}
   } else {
     while ((row = taos_fetch_row(res))) {
+      char buf[4096] = {0};
       taos_print_row(buf, row, fields, num_fields);
       puts(buf);
       nRows++;

From e42a8bc633a43f1fc4e8fec660e576c6886a3c22 Mon Sep 17 00:00:00 2001
From: Qiyuan Jiao <jiaoqiyuan@outlook.com>
Date: Tue, 8 Jun 2021 17:45:32 +0800
Subject: [PATCH 2/2] Update apitest.c

remove unneeded define
---
 tests/examples/c/apitest.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/tests/examples/c/apitest.c b/tests/examples/c/apitest.c
index a482e2902e..f881b5b20c 100644
--- a/tests/examples/c/apitest.c
+++ b/tests/examples/c/apitest.c
@@ -852,7 +852,6 @@ void verify_prepare3(TAOS* taos) {
   int         rows = 0;
   int         num_fields = taos_num_fields(result);
   TAOS_FIELD *fields = taos_fetch_fields(result);
-  char        temp[256] = {0};
 
   // fetch the records row by row
   while ((row = taos_fetch_row(result))) {