- **status**: accepted --> review
---
** [tickets:#625] osaf: Support constant strings in SAF APIs**
**Status:** review
**Milestone:** 4.5.FC
**Created:** Wed Nov 13, 2013 11:25 AM UTC by Anders Widell
**Last Updated:** Wed Mar 05, 2014 08:35 AM UTC
**Owner:** Anders Widell
There is a fundamental problem with the **SaStringT** type as it is currently
defined:
typedef char* SaStringT;
When **SaStringT** is defined like this, it is impossible to declare a string
constant using it. For example, a variable decleared like this:
const SaStringT x;
has the following meaning:
char *const x;
i.e., it is only the pointer **x** that is constant, not the string that it is
pointing to.
There are several possible ways to support constant strings in the SAF APIs:
1) Introduce a new type **SaCharT**, and use **SaCharT** pointers in the API
calls instead of **SaStringT**. Since **SaStringT** is defined as a character
pointer, it should be possible to replace occurrences of **SaStringT** with **
SaCharT* ** without breaking backwards compatibility.
2) Replace the **SaStringT** typedef with a C preprocessor macro, like this:
#define SaStringT char*
3) Intruduce a new type **SaConstStringT**:
typedef const char* SaConstStringT;
The proposal is to go for 3), and to begin with only define the new type. The
new type can later on be used when defining new APIs.
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