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cmStack.h/c: Added cmStackTop() to return the top stack element.

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This commit is contained in:
kevin 2013-02-18 14:31:03 -08:00
parent 445824a5ed
commit 8f09079fe0
2 changed files with 13 additions and 1 deletions
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8
cmStack.c
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@ -238,6 +238,14 @@ cmStRC_t cmStackPop( cmStackH_t h, unsigned eleCnt )
return rc; return rc;
} }
const void* cmStackTop( cmStackH_t h )
{
unsigned n = cmStackCount(h);
if( n == 0 )
return NULL;
return cmStackGet(h,n-1);
}
cmStRC_t _cmStackSetGet( cmStack_t* p, unsigned index, char* data, unsigned dataEleCnt, bool setFl ) cmStRC_t _cmStackSetGet( cmStack_t* p, unsigned index, char* data, unsigned dataEleCnt, bool setFl )
{ {
cmStRC_t rc = kOkStRC; cmStRC_t rc = kOkStRC;

6
cmStack.h
View File

@ -18,7 +18,7 @@ extern "C" {
extern cmStackH_t cmStackNullHandle; extern cmStackH_t cmStackNullHandle;
// Allocate a stack to hold fixed data elements of size 'eleByteCnt'. // Allocate a stack to hold data elements each of size 'eleByteCnt'.
// The stack will be initialized with 'initCnt' empty slots. Once these // The stack will be initialized with 'initCnt' empty slots. Once these
// slots are filled 'expandCnt' additional slots will be added as necessary. // slots are filled 'expandCnt' additional slots will be added as necessary.
cmStRC_t cmStackAlloc( cmCtx_t* ctx, cmStackH_t* hp, unsigned initCnt, unsigned expandCnt, unsigned eleByteCnt ); cmStRC_t cmStackAlloc( cmCtx_t* ctx, cmStackH_t* hp, unsigned initCnt, unsigned expandCnt, unsigned eleByteCnt );
@ -37,6 +37,10 @@ extern "C" {
// Remove 'eleCnt' elements from the stack. // Remove 'eleCnt' elements from the stack.
cmStRC_t cmStackPop( cmStackH_t h, unsigned eleCnt ); cmStRC_t cmStackPop( cmStackH_t h, unsigned eleCnt );
// Return a pointer to the top element on the stack. This is the one which will be
// lost with the next call to cmStackPop(h,1).
const void* cmStackTop( cmStackH_t h );
// Set the value of 'dataEleCnt' elements on the stack. // Set the value of 'dataEleCnt' elements on the stack.
cmStRC_t cmStackSet( cmStackH_t h, unsigned index, const void* data, unsigned dataEleCnt ); cmStRC_t cmStackSet( cmStackH_t h, unsigned index, const void* data, unsigned dataEleCnt );