feat(schemaless): support escape character back-slash tab and back-slash return

examples/c/apitest.c

@@ -279,7 +279,8 @@ void verify_schema_less(TAOS* taos) {
   int code = 0, affected_rows = 0;
 
   char* lines[] = {
-      "st,t1=3i64,t2=4f64,t3=\"t3\" c1=3i64,c3=L\"passit\",c2=false,c4=4f64 1626006833639000000",
+      // test support \n \t \r 
+      "st,t1=3i64,t2=4f64,t3=\"t3\" c1=3i64,c3=L\"aaa\tbbb\nccc\\\\tddd\\\\neee\\nfff\\rggg\\thhh\",c2=false,c4=4f64 1626006833639000000",
       "st,t1=4i64,t3=\"t4\",t2=5f64,t4=5f64 c1=3i64,c3=L\"passitagin\",c2=true,c4=5f64,c5=5f64 1626006833640000000",
       "ste,t2=5f64,t3=L\"ste\" c1=true,c2=4i64,c3=\"iam\" 1626056811823316532",
       "st,t1=4i64,t2=5f64,t3=\"t4\" c1=3i64,c3=L\"passitagain\",c2=true,c4=5f64 1626006833642000000",

src/client/src/tscParseLineProtocol.c

@@ -2116,7 +2116,7 @@ static int32_t parseSmlValue(TAOS_SML_KV *pKV, const char **idx, int32_t sqlLen,
       switch (tag_state) {
       case tag_common:
         if (back_slash == true) {
-          if (*cur != ',' && *cur != '=' && *cur != ' ' && *cur != 'n' ) {
+          if (*cur != ',' && *cur != '=' && *cur != ' ' && *cur != 'n' && *cur != 't' && *cur != 'r') {
             tscError("SML:0x%"PRIx64" tag value: state(%d), incorrect character(%c) escaped", info->id, tag_state, *cur);
             ret = TSDB_CODE_TSC_LINE_SYNTAX_ERROR;
             goto error;
@@ -2176,7 +2176,7 @@ static int32_t parseSmlValue(TAOS_SML_KV *pKV, const char **idx, int32_t sqlLen,
         break;
       case tag_lqoute:
         if (back_slash == true) {
-          if (*cur != ',' && *cur != '=' && *cur != ' ' && *cur != 'n') {
+          if (*cur != ',' && *cur != '=' && *cur != ' ' && *cur != 'n' && *cur != 't' && *cur != 'r') {
             tscError("SML:0x%"PRIx64" tag value: state(%d), incorrect character(%c) escaped", info->id, tag_state, *cur);
             ret = TSDB_CODE_TSC_LINE_SYNTAX_ERROR;
             goto error;
@@ -2231,7 +2231,7 @@ static int32_t parseSmlValue(TAOS_SML_KV *pKV, const char **idx, int32_t sqlLen,
       switch (val_state) {
       case val_common:
         if (back_slash == true) {
-          if (*cur != '\\' && *cur != '"' && *cur != 'n') {
+          if (*cur != '\\' && *cur != '"' && *cur != 'n' && *cur != 't' && *cur != 'r') {
             tscError("SML:0x%"PRIx64" field value: state(%d), incorrect character(%c) escaped", info->id, val_state, *cur);
             ret = TSDB_CODE_TSC_LINE_SYNTAX_ERROR;
             goto error;
@@ -2319,7 +2319,7 @@ static int32_t parseSmlValue(TAOS_SML_KV *pKV, const char **idx, int32_t sqlLen,
         break;
       case val_lqoute:
         if (back_slash == true) {
-          if (*cur != '\\' && *cur != '"' && *cur != 'n') {
+          if (*cur != '\\' && *cur != '"' && *cur != 'n' && *cur != 't' && *cur != 'r') {
             tscError("SML:0x%"PRIx64" field value: state(%d), incorrect character(%c) escaped", info->id, val_state, *cur);
             ret = TSDB_CODE_TSC_LINE_SYNTAX_ERROR;
             goto error;