diff --git a/c/tex_parser/tex_table.c b/c/tex_parser/tex_table.c
index d41e7e7..7cfd490 100644
--- a/c/tex_parser/tex_table.c
+++ b/c/tex_parser/tex_table.c
@@ -10,21 +10,8 @@
 /* unnecessary includes */
 #include <stdio.h>
 
-enum tex_parse_err {
-	TEX_PARSING_NOERROR = 0,
-	TEX_PARSING_ERROR_UNDEF,
-	TEX_PARSING_ERROR_STACKOVERFLOW
-};
-
-char * const TEX_PARSING_ERROR_UNDEF_STR = "unknown parsing error";
-char * const TEX_PARSING_ERROR_STACKOVERFLOW_STR = "parser stack overflow";
-
 int parse_table(const char *table_source, size_t len, struct table_s *table, struct xerror_s *error)
 {
-	char *tag = NULL;/*,
-	     *brpar = NULL;*/
-	size_t i = 0;
-
 	if (!len)
 		len = strlen(table_source);
 
@@ -33,6 +20,8 @@ int parse_table(const char *table_source, size_t len, struct table_s *table, str
 		IN_UNDEF = 0, // undefined place
 		IN_COMMENT, // any comment
 		IN_TAG, // any tag
+		IN_TAG_UNKNOWN, // unknown tag
+		IN_SPACE, // space, \tag  { for example
 		IN_TAGPARM, // in \tag{} curly braces
 		IN_TAG_BEGIN,
 		IN_TAG_CLINE,
@@ -50,14 +39,16 @@ int parse_table(const char *table_source, size_t len, struct table_s *table, str
 
 	} where_stack[MAX_TEX_STACK_LEVEL] = {IN_UNDEF};
 
+	char *tag = NULL;
+	size_t i = 0;
 	size_t tex_level = 0;
 
 	for (i = 0; i < len; i++) {
 
 		/* stack checking */
 		if (tex_level + 1 == MAX_TEX_STACK_LEVEL) {
-			error->code = TEX_PARSING_ERROR_STACKOVERFLOW;
-			error->message = TEX_PARSING_ERROR_STACKOVERFLOW_STR;
+			error->code = (int)i;
+			error->message = "stack overflow";
 			return error->code;
 		}
 
@@ -75,8 +66,8 @@ int parse_table(const char *table_source, size_t len, struct table_s *table, str
 				where_stack[++tex_level] = IN_COMMENT;
 
 			} else {
-				error->code = TEX_PARSING_ERROR_UNDEF;
-				error->message = TEX_PARSING_ERROR_UNDEF_STR;
+				error->code = (int)i;
+				error->message = "unexpected symbol (IN_UDEF)";
 				return error->code;
 			}
 
@@ -92,12 +83,12 @@ int parse_table(const char *table_source, size_t len, struct table_s *table, str
 			if (isalnum(c)) {
 				tag = zalloc_append8_str(tag, c);
 
-			} else if (!tag && c == '\\')) { // newline tag
+			} else if (!tag && c == '\\') { // newline tag
 				where_stack[tex_level--] = IN_UNDEF;
 
 			} else if (!tag) {
-				error->code = TEX_PARSING_ERROR_UNDEF;
-				error->message = TEX_PARSING_ERROR_UNDEF_STR;
+				error->code = (int)i;
+				error->message = "empty tag (IN_TAG)";
 				return error->code;
 
 			} else if (!strcmp(tag, TEX_TAG_BEGIN)) {
@@ -155,32 +146,37 @@ int parse_table(const char *table_source, size_t len, struct table_s *table, str
 				printf("\\%s\n", tag);
 				tag = zfree_null(tag);
 
+			} else if (c == '%') {
+				printf("\\%s\n", tag);
+				tag = zfree_null(tag);
+				where_stack[tex_level] = IN_TAG_UNKNOWN;
+				where_stack[++tex_level] = IN_COMMENT;
+
+			} else if (c == '{' || c == '[') {
+				printf("\\%s\n", tag);
+				tag = zfree_null(tag);
+				where_stack[tex_level] = IN_TAG_UNKNOWN;
+				where_stack[++tex_level] = IN_TAGPARM;
+
+			} else if (isspace(c)) { // \tag { for example
+				printf("\\%s\n", tag);
+				tag = zfree_null(tag);
+				where_stack[tex_level] = IN_TAG_UNKNOWN;
+				where_stack[++tex_level] = IN_SPACE;
+
 			} else { // unknown tag
 				printf("\\%s\n", tag);
 				tag = zfree_null(tag);
-
-			} else if (c == '{' || c == '[') {
-				where_stack[++tex_level] = IN_TAGPARM;
-
-
-
-
-			} else if (isspace(c)) {
-
-			} else if (c == '{' || c == '[') {
-				where_stack[++tex_level] = IN_TAGPARM;
-
-			} else if (c == '%') {
-				where_stack[++tex_level] = IN_COMMENT;
-
-			} else if (!tag) {
-				error->code = TEX_PARSING_ERROR_UNDEF;
-				error->message = TEX_PARSING_ERROR_UNDEF_STR;
-				return error->code;
-			} else {
-
+				where_stack[tex_level] = IN_TAG_UNKNOWN;
 			}
+		break;
 
+		case IN_SPACE:
+			if (isspace(c)) {
+
+			} else {
+				where_stack[tex_level--] = IN_UNDEF;
+			}
 		break;
 
 		case IN_TAGPARM:
@@ -194,18 +190,25 @@ int parse_table(const char *table_source, size_t len, struct table_s *table, str
 				tag = zfree_null(tag);
 				where_stack[++tex_level] = IN_TAG;
 
+			} else if (isspace(c)) {
+				where_stack[++tex_level] = IN_SPACE;
+
+			} else if (c == '%') {
+				where_stack[++tex_level] = IN_COMMENT;
+
 			} else if (isprint(c)) {
-				//~ brpar = zalloc_append8_str(brpar, c); // ???????
 
 			} else {
-				error->code = TEX_PARSING_ERROR_UNDEF;
-				error->message = TEX_PARSING_ERROR_UNDEF_STR;
+				error->code = (int)i;
+				error->message = "unexpected symbol (IN_TAGPARM)";
 				return error->code;
 			}
 		break;
 
-		case IN_TAG_BEGIN:
-			if (c == '{' || c == '[') { // tag params
+		case IN_TAG_UNKNOWN:
+			if (isspace(c)) {
+
+			} else if (c == '{' || c == '[') { // tag params
 				where_stack[++tex_level] = IN_TAGPARM;
 
 			} else if (c == '\\') { // new tag
@@ -216,10 +219,34 @@ int parse_table(const char *table_source, size_t len, struct table_s *table, str
 				}
 
 			} else if (isspace(c)) {
+				where_stack[++tex_level] = IN_SPACE;
 
 			} else {
-				error->code = TEX_PARSING_ERROR_UNDEF;
-				error->message = TEX_PARSING_ERROR_UNDEF_STR;
+				error->code = (int)i;
+				error->message = "unexpected symbol (IN_TAG_UNKNOWN)";
+				return error->code;
+			}
+		break;
+
+		case IN_TAG_BEGIN:
+			if (isspace(c)) {
+
+			} else if (c == '{' || c == '[') { // tag params
+				where_stack[++tex_level] = IN_TAGPARM;
+
+			} else if (c == '\\') { // new tag
+				tag = zfree_null(tag);
+				where_stack[tex_level] = IN_TAG;
+
+				if (FALSE) { // longtable
+				}
+
+			} else if (isspace(c)) {
+				where_stack[++tex_level] = IN_SPACE;
+
+			} else {
+				error->code = (int)i;
+				error->message = "unexpected symbol (IN_TAG_BEGIN)";
 				return error->code;
 			}
 		break;
@@ -273,8 +300,8 @@ int parse_table(const char *table_source, size_t len, struct table_s *table, str
 		break;
 
 		default:
-			error->code = TEX_PARSING_ERROR_UNDEF;
-			error->message = TEX_PARSING_ERROR_UNDEF_STR;
+			error->code = (int)i;
+			error->message = "unknown error";
 			return error->code;
 		break;
 		}
diff --git a/c/tex_parser/tex_table.geany b/c/tex_parser/tex_table.geany
index 7a66dff..4e81e41 100644
--- a/c/tex_parser/tex_table.geany
+++ b/c/tex_parser/tex_table.geany
@@ -18,7 +18,7 @@ long_line_column=72
 [files]
 current_page=1
 FILE_NAME_0=1029;C;0;16;1;1;1;/home/kolan/dev/c/tex_parser/tex_table_test.c;0
-FILE_NAME_1=2132;C;0;16;1;1;1;/home/kolan/dev/c/tex_parser/tex_table.c;0
+FILE_NAME_1=1575;C;0;16;1;1;1;/home/kolan/dev/c/tex_parser/tex_table.c;0
 FILE_NAME_2=119;C;0;16;1;1;1;/home/kolan/dev/c/tex_parser/tex_table.h;0
 FILE_NAME_3=1762;C;0;16;1;1;1;/home/kolan/projects/include/zalloc_ext.h;0
 FILE_NAME_4=634;C;0;16;1;1;1;/home/kolan/dev/c/tex_parser/tex_table_tags.h;0
diff --git a/c/tex_parser/tex_table.h b/c/tex_parser/tex_table.h
index d6f6d8f..5820dce 100644
--- a/c/tex_parser/tex_table.h
+++ b/c/tex_parser/tex_table.h
@@ -53,6 +53,8 @@ struct table_s {
 	struct row_s *rows;
 };
 
+/* LaTeX table parser
+ */
 int parse_table(const char *table_source, size_t len, struct table_s *table, struct xerror_s *error);
 
 #endif
diff --git a/c/tex_parser/tex_table_test.c b/c/tex_parser/tex_table_test.c
index ee75bf3..b715885 100644
--- a/c/tex_parser/tex_table_test.c
+++ b/c/tex_parser/tex_table_test.c
@@ -31,10 +31,11 @@ int main(int argc, char *argv[])
 	struct xerror_s error;
 	struct table_s table;
 	memset(&table, 0, sizeof(struct table_s));
+	memset(&error, 0, sizeof(struct xerror_s));
 	/* Коммент по-русски */
 	int result = parse_table(tex_buf, (size_t)stat_buf.st_size, &table, &error);
 	if (result) {
-		printf("Parsing error: %s\n", error.message);
+		printf("Parsing error at %d, symb=%c: %s\n", error.code + 1, tex_buf[error.code], error.message);
 	}
 
 	tex_buf = xfree_null(tex_buf);