Studio:Scl string: Difference between revisions

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== Examples ==
== Examples ==


Two examples using the scl_string pragma are shown below:
1. Use the scl_string pragma to specify type definitions as null terminated ASCII strings.
 
<source lang="c">
=== Example 1 ===
The first example uses the scl_string pragma to define type definitions as null terminated ASCII strings.
<source lang=c>
#define MAX_STR_SIZE 100
#define MAX_STR_SIZE 100


typedef char ArrayAsAsciiString_t[MAX_STR_SIZE];
typedef char ArrayAsAsciiString_t[MAX_STR_SIZE];
#pragma scl_string( ArrayAsAsciiString_t, MAX_STR_SIZE )
typedef char* PointerAsAsciiString_t;  
typedef char* PointerAsAsciiString_t;  
#pragma scl_string( PointerAsAsciiString_t, MAX_STR_SIZE )
#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)
</source>


=== Example 2 ===
The second example uses the scl_string pragma to define a structure member and a parameter list member as null terminated ASCII strings.
<source lang=c>
#define MAX_STR_SIZE 64 
/* ASCII string defined as a pointer to char */
typedef struct {
typedef struct {
   char * pointerToAsciiString;
   char * pointerToAsciiString;
   char arrayAsAsciiString[MAX_STR_SIZE];
   char arrayAsAsciiString[MAX_STR_SIZE];
} Struct_t;
} Struct_t;
#pragma scl_string( Struct_t, pointerToAsciiString, MAX_STR_SIZE )
#pragma scl_string( Struct_t, arrayAsAsciiString, MAX_STR_SIZE )
</source>
   
   
/* Function with an input parameter of type ASCII string */
2. Use the scl_string pragma to specify a function argument as null terminated ASCII string.
void SetString( char * parameterAsAsciiString );
<source lang="c">
void SetString(const char* pBuf);
#pragma scl_function(SetString)
#pragma scl_function(SetString)
/* Use the scl_string pragma to define the above structure    */
#pragma scl_string(SetString.pBuf, MAX_STR_SIZE)
/* and parameter list members as null-terminated ASCII strings */
 
#pragma scl_string( Struct_t, pointerToAsciiString, MAX_STR_SIZE )
typedef struct {
#pragma scl_string( Struct_t, arrayAsAsciiString, MAX_STR_SIZE )
  char * pBuf;
#pragma scl_string( SetString, parameterAsAsciiString, MAX_STR_SIZE )
} Struct_t;
void SetSructString(Struct_t tValue);
#pragma scl_function(SetSructString)
#pragma scl_string(SetSructString.tValue.pBuf, MAX_STR_SIZE)
</source>
 
3. Use the scl_string pragma to specify a function return value as null terminated ASCII string.
<source lang="c">
const char* GetString(void);
#pragma scl_function(GetString)
#pragma scl_string(GetString(), MAX_STR_SIZE)
 
typedef struct {
  char * pBuf;
} Struct_t;
Struct_t* GetSructString(void);
#pragma scl_function(GetSructString)
#pragma scl_string(GetSructString()->pBuf, MAX_STR_SIZE)
</source>
</source>


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* For additional information on scl_string, including constraints, refer to the section on scl_string in the [[Media:s2sSCLReferenceGuide.pdf|SCL Reference Guide]].
* For additional information on scl_string, including constraints, refer to the section on scl_string in the [[Media:s2sSCLReferenceGuide.pdf|SCL Reference Guide]].


[[Category: SCL]]
[[Category:Studio:SCL]]

Latest revision as of 21:16, 29 June 2010

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.

Examples

1. Use the scl_string pragma to specify type definitions as null terminated ASCII strings.

#define MAX_STR_SIZE 100

typedef char ArrayAsAsciiString_t[MAX_STR_SIZE];
#pragma scl_string( ArrayAsAsciiString_t, MAX_STR_SIZE )

typedef char* PointerAsAsciiString_t; 
#pragma scl_string( PointerAsAsciiString_t, MAX_STR_SIZE )

typedef struct {
  char * pointerToAsciiString;
  char arrayAsAsciiString[MAX_STR_SIZE];
} Struct_t;
#pragma scl_string( Struct_t, pointerToAsciiString, MAX_STR_SIZE )
#pragma scl_string( Struct_t, arrayAsAsciiString, MAX_STR_SIZE )

2. Use the scl_string pragma to specify a function argument as null terminated ASCII string.

void SetString(const char* pBuf);
#pragma scl_function(SetString)
#pragma scl_string(SetString.pBuf, MAX_STR_SIZE)

typedef struct {
  char * pBuf;
} Struct_t;
void SetSructString(Struct_t tValue);
#pragma scl_function(SetSructString)
#pragma scl_string(SetSructString.tValue.pBuf, MAX_STR_SIZE)

3. Use the scl_string pragma to specify a function return value as null terminated ASCII string.

const char* GetString(void);
#pragma scl_function(GetString)
#pragma scl_string(GetString(), MAX_STR_SIZE)

typedef struct {
  char * pBuf;
} Struct_t;
Struct_t* GetSructString(void);
#pragma scl_function(GetSructString)
#pragma scl_string(GetSructString()->pBuf, MAX_STR_SIZE)

See Also

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