--- libelwix/src/str.c	2023/03/14 22:36:13	1.10
+++ libelwix/src/str.c	2024/10/28 09:58:51	1.11
@@ -3,7 +3,7 @@
 *  by Michael Pounov <misho@elwix.org>
 *
 * $Author: misho $
-* $Id: str.c,v 1.10 2023/03/14 22:36:13 misho Exp $
+* $Id: str.c,v 1.11 2024/10/28 09:58:51 misho Exp $
 *
 **************************************************************************
 The ELWIX and AITNET software is distributed under the following
@@ -12,7 +12,7 @@ terms:
 All of the documentation and software included in the ELWIX and AITNET
 Releases is copyrighted by ELWIX - Sofia/Bulgaria <info@elwix.org>
 
-Copyright 2004 - 2023
+Copyright 2004 - 2024
 	by Michael Pounov <misho@elwix.org>.  All rights reserved.
 
 Redistribution and use in source and binary forms, with or without
@@ -522,4 +522,66 @@ str_getString2(char * __restrict data, int dlen, char 
 	if (next)
 		*next = (char*) pos + 1;
 	return pos - data;
+}
+
+/*
+ * str_find2replace() - Search find string into data and replace
+ *
+ * @data = input string
+ * @find = search for string
+ * @replace = replace to string. If it is NULL then deletes found search string
+ * @str = new produced allocate string. If it is NULL then just return found occurances of find
+ * @mlen = allocated memory size for new string
+ * return: -1 error, 0 not found or >0 how many occurances we have for find string
+ */
+int
+str_find2replace(const char *data, const char *find, const char *replace, char **str, int *mlen)
+{
+	int cnt = 0, data_len, slen, find_len, replace_len = 0;
+	const char *pos, *s;
+
+	if (!data || !find)
+		return -1;
+
+	find_len = strlen(find);
+	data_len = strlen(data);
+	for (pos = data; (pos = strstr(pos, find)); pos += find_len, cnt++);
+
+	/* just count occurances */
+	if (!str || !mlen)
+		return cnt;
+
+	slen = data_len - find_len * cnt;
+	if (replace) {
+		replace_len = strlen(replace);
+		slen += replace_len * cnt;
+	}
+	/* alloc exports string */
+	*mlen = slen + 1;
+	*str = e_malloc(*mlen);
+	if (!*str)
+		return -1;
+	else
+		memset(*str, 0, *mlen);
+
+	/* search & replace */
+	for (pos = data; *pos;) {
+		s = strstr(pos, find);
+		if (s)
+			slen = s - pos;
+		else
+			slen = strlen(pos);
+		/* 
+		 * This hack was made due to behaviour of compiler against strncat(*str, pos, slen)!
+		 */
+		memcpy(*str + strlen(*str), pos, slen);
+		if (s) {
+			if (replace)
+				strncat(*str, replace, replace_len);
+			pos += find_len;
+		}
+		pos += slen;
+	}
+
+	return cnt;
 }