Studio:Scl string

The scl_string pragma

The scl_string pragma identifies a particular array type or pointer type as a string. The string type (ASCII or UNICODE) is derived from the element type (1-byte or 2-byte, respectively).

Syntax

#pragma scl_string(type-name, max-size)

#pragma scl_string(type-name, field-name, max-size)

Parameters	Type	Description
type-name	Type	Name of the type that contains the array/pointer: structure or union the array/pointer type itself function name If the container type is a structure or union and the array/pointer is a member, then field-name must be specified.
field-name [Optional]	Member	Optional name of the array/pointer member contained within a structure/union, or the name of the pointer in the parameter list of a function. If type-name is a structure or union and the array/pointer is a member, then field-name must be specified.
max-size	Integer	Specifies the maximum length of the string.

Notes

For additional information on scl_string, including constraints, refer to the section on scl_string in the [SCL Reference Guide].

Examples

Two examples using the scl_string pragma are shown below:

1. The first example uses the scl_string pragma to define type definitions as null terminated ASCII strings.
2. The second example uses the scl_string pragma to define a structure member and a parameter list member as null terminated ASCII strings.

Example 1

   #define MAX_STR_SIZE 100
   typedef char ArrayAsAsciiString_t[MAX_STR_SIZE];
   typedef char* PointerAsAsciiString_t; 
   #pragma scl_string( PointerAsAsciiString_t, MAX_STR_SIZE )
   #pragma scl_string( ArrayAsAsciiString_t, MAX_STR_SIZE )
   void GetString(char* pBuf);
   #pragma scl_function(GetString)
   #pragma scl_ptr(GetString, pBuf, OUT, PRIVATE)
   #pragma scl_string(GetString, pBuf, MAX_STR_SIZE)

Example 2

   #define MAX_STR_SIZE 64  
   /* ASCII string defined as a pointer to char */
   typedef struct {
       char * pointerToAsciiString;
       char arrayAsAsciiString[MAX_STR_SIZE];
   }Struct_t;
   /* Function with an input parameter of type ASCII string */
   void SetString( char * parameterAsAsciiString );
   #pragma scl_function(SetString)
   /* Use the scl_string pragma to define the above structure     */
   /* and parameter list members as null-terminated ASCII strings */
   #pragma scl_string( Struct_t, pointerToAsciiString, MAX_STR_SIZE )
   #pragma scl_string( Struct_t, arrayAsAsciiString, MAX_STR_SIZE )
   #pragma scl_string( SetString, parameterAsAsciiString, MAX_STR_SIZE )