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/*
tre-stack.h: Stack definitions
This software is released under a BSD-style license.
See the file LICENSE for details and copyright.
*/
#ifndef TRE_STACK_H
#define TRE_STACK_H 1
#include "../local_includes/tre.h"
typedef struct tre_stack_rec tre_stack_t;
/* Creates a new stack object. `size' is initial size in bytes, `max_size'
is maximum size, and `increment' specifies how much more space will be
allocated with realloc() if all space gets used up. Returns the stack
object or NULL if out of memory. */
tre_stack_t *
tre_stack_new(int size, int max_size, int increment);
/* Frees the stack object. */
void
tre_stack_destroy(tre_stack_t *s);
/* Returns the current number of objects in the stack. */
int
tre_stack_num_objects(tre_stack_t *s);
/* Each tre_stack_push_*(tre_stack_t *s, <type> value) function pushes
`value' on top of stack `s'. Returns REG_ESPACE if out of memory.
This tries to realloc() more space before failing if maximum size
has not yet been reached. Returns REG_OK if successful. */
#define declare_pushf(typetag, type) \
reg_errcode_t tre_stack_push_ ## typetag(tre_stack_t *s, type value)
declare_pushf(voidptr, void *);
declare_pushf(int, int);
/* Each tre_stack_pop_*(tre_stack_t *s) function pops the topmost
element off of stack `s' and returns it. The stack must not be
empty. */
#define declare_popf(typetag, type) \
type tre_stack_pop_ ## typetag(tre_stack_t *s)
declare_popf(voidptr, void *);
declare_popf(int, int);
/* Just to save some typing. */
#define STACK_PUSH(s, typetag, value) \
do \
{ \
status = tre_stack_push_ ## typetag(s, value); \
} \
while (/*CONSTCOND*/(void)0,0)
#define STACK_PUSHX(s, typetag, value) \
{ \
status = tre_stack_push_ ## typetag(s, value); \
if (status != REG_OK) \
break; \
}
#define STACK_PUSHR(s, typetag, value) \
{ \
reg_errcode_t _status; \
_status = tre_stack_push_ ## typetag(s, value); \
if (_status != REG_OK) \
return _status; \
}
#endif /* TRE_STACK_H */
/* EOF */
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