Using isalnum instead isalpha

src/buffer.h

@@ -281,7 +281,7 @@ buffer_index_bw_word(struct buffer buf)
 	size_t i = buf.cur - 1;
 	for ( ; i > 0; --i) {
 		char c = buf.data.items[i];
-		if ( isalpha(c) ) {
+		if ( isalnum(c) ) {
 			found_letter = true;
 		} else if ( found_letter ) {
 			++i;
@@ -290,7 +290,7 @@ buffer_index_bw_word(struct buffer buf)
 	}
 	if ( i == 0 ) {
 		char c = buf.data.items[i];
-		if ( isalpha(c) ) {
+		if ( isalnum(c) ) {
 			found_letter = true;
 		} else if ( found_letter ) {
 			++i;
@@ -314,7 +314,7 @@ err: ;
 struct ret_size_t_err
 buffer_index_fw_word(struct buffer buf)
 {
-		enum buffer_err err = BUFFER_ERR_OK;
+	enum buffer_err err = BUFFER_ERR_OK;
 	if ( buf.data.size == 0 ) {
 		err = BUFFER_ERR_EMPTY;
 		goto err;
@@ -329,7 +329,7 @@ buffer_index_fw_word(struct buffer buf)
 	size_t i = buf.cur;
 	for ( ; i < buf.data.size; ++i) {
 		char c = buf.data.items[i];
-		if ( isalpha(c) ) {
+		if ( isalnum(c) ) {
 			found_letter = true;
 		} else if ( found_letter ) {
 			goto exit;
@@ -337,7 +337,7 @@ buffer_index_fw_word(struct buffer buf)
 	}
 	if ( i == 0 ) {
 		char c = buf.data.items[i];
-		if ( isalpha(c) ) {
+		if ( isalnum(c) ) {
 			found_letter = true;
 		} else if ( found_letter ) {
 			goto exit;