[PATCH 1/2] [TAKE 3] Add str_replace() To Tapsets

[Varun Chandramohan <varunc at linux dot vnet dot ibm dot com>]

Hi,

This patch adds a search and replace string functionality to existing tapsets.

The functionality is as follows:

The function takes in a parent string and searches for a substring as specified by the user. If substing not found, the parent string is returned. If substring is found, it is replaced by another string and returned.

NOTE: The function will search and replace all the occurance of substrings in a parent string when matched.

Signed-off-by: Varun Chandramohan <varunc@linux.vnet.ibm.com>
---
 tapset/string.stp |   39 +++++++++++++++++++++++++++++++++++++++
 1 files changed, 39 insertions(+), 0 deletions(-)

diff --git a/tapset/string.stp b/tapset/string.stp
index 35ee9fa..8c015d6 100644
--- a/tapset/string.stp
+++ b/tapset/string.stp
@@ -92,6 +92,45 @@ function tokenize:string(input:string, delim:string)
 %}
 
 /*
+ * str_replace - Takes a parent string, uses the second string which is a
+ * 		 substring to parent string and replaces that with the
+ *		 third string of same lenght as second and returns the
+ *		 new converted parent string.
+ * prnt_str	 The parent string.
+ *
+ * srch_str	 The substring which is used to search in the parent string
+ *		 prnt_str. The srch_str can't be an empty string.
+ *
+ * rplc_str	 The substring which is used to replace the searched string
+ *		 srch_str.
+ */
+function str_replace:string (prnt_str:string, srch_str:string, rplc_str:string)
+%{
+	char *ptr = THIS->prnt_str;
+	char *ptr_base = THIS->prnt_str;
+	int strlen_prnt_str = strlen(THIS->prnt_str);
+	int strlen_srch_str = strlen(THIS->srch_str);
+	int strlen_rplc_str = strlen(THIS->rplc_str);
+
+	if(strlen_srch_str == 0) {
+		CONTEXT->last_error = "Invalid Search String";
+		return;
+	}
+
+	while((ptr = strstr(ptr, THIS->srch_str)) != NULL) {
+
+		*ptr = '\0';
+		strlcat(THIS->__retvalue, ptr_base, MAXSTRINGLEN);
+		strlcat(THIS->__retvalue, THIS->rplc_str, MAXSTRINGLEN);
+		ptr = ptr + strlen_srch_str;
+		ptr_base = ptr;
+	}
+
+	strlcat(THIS->__retvalue, ptr_base, MAXSTRINGLEN);
+	return;
+%}
+
+/*
  * strtol - Convert a string to a long
  *   str   String to convert
  *   base  The base to use
-- 
1.6.0.4