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/* -----------------------------------------------------------------
FILE: stack.h
DESCRIPTION:Macro descriptions for implementing simple stack operations.
CONTENTS:
DATE: Dec 6, 1989
REVISIONS:
----------------------------------------------------------------- */
#ifndef STACK_H
#define STACK_H
#define YSIZE_STACK 0
#define YSTACK_POINT 1
#include <yalecad/message.h>
#define YINITSTACK( stack_xyz, size_xyz ) \
{ \
stack_xyz = (INT *) Ysafe_malloc( (size_xyz+2) * sizeof(int) ) ; \
stack_xyz[YSIZE_STACK] = size_xyz + 1 ; \
stack_xyz[YSTACK_POINT] = 1 ; \
}
#define YCLEARSTACK( stack_xyz ) \
{ \
stack_xyz[YSTACK_POINT] = 1 ; \
}
#define YPOPSTACK( stack_xyz ) \
( stack_xyz[YSTACK_POINT] > YSTACK_POINT ? stack_xyz[stack_xyz[YSTACK_POINT]--] : 0 )
#define YPUSHSTACK( stack_xyz, data_xyz ) \
{ \
if( ++stack_xyz[YSTACK_POINT] <= stack_xyz[YSIZE_STACK] ){ \
stack_xyz[ stack_xyz[YSTACK_POINT] ] = data_xyz ; \
} else { \
M( ERRMSG, "YPUSHSTACK", "stack_overflow\n" ) ; \
} \
}
#endif /* STACK_H */
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