163d4abf0Sagc /* 263d4abf0Sagc tre-stack.h: Stack definitions 363d4abf0Sagc 463d4abf0Sagc This software is released under a BSD-style license. 563d4abf0Sagc See the file LICENSE for details and copyright. 663d4abf0Sagc 763d4abf0Sagc */ 863d4abf0Sagc 963d4abf0Sagc 1063d4abf0Sagc #ifndef TRE_STACK_H 1163d4abf0Sagc #define TRE_STACK_H 1 1263d4abf0Sagc 1363d4abf0Sagc #include "tre.h" 1463d4abf0Sagc 1563d4abf0Sagc typedef struct tre_stack_rec tre_stack_t; 1663d4abf0Sagc 1763d4abf0Sagc /* Creates a new stack object. `size' is initial size in bytes, `max_size' 1863d4abf0Sagc is maximum size, and `increment' specifies how much more space will be 1963d4abf0Sagc allocated with realloc() if all space gets used up. Returns the stack 2063d4abf0Sagc object or NULL if out of memory. */ 2163d4abf0Sagc tre_stack_t * 2263d4abf0Sagc tre_stack_new(int size, int max_size, int increment); 2363d4abf0Sagc 2463d4abf0Sagc /* Frees the stack object. */ 2563d4abf0Sagc void 2663d4abf0Sagc tre_stack_destroy(tre_stack_t *s); 2763d4abf0Sagc 2863d4abf0Sagc /* Returns the current number of objects in the stack. */ 2963d4abf0Sagc int 3063d4abf0Sagc tre_stack_num_objects(tre_stack_t *s); 3163d4abf0Sagc 3263d4abf0Sagc /* Each tre_stack_push_*(tre_stack_t *s, <type> value) function pushes 3363d4abf0Sagc `value' on top of stack `s'. Returns REG_ESPACE if out of memory. 3463d4abf0Sagc This tries to realloc() more space before failing if maximum size 3563d4abf0Sagc has not yet been reached. Returns REG_OK if successful. */ 3663d4abf0Sagc #define declare_pushf(typetag, type) \ 3763d4abf0Sagc reg_errcode_t tre_stack_push_ ## typetag(tre_stack_t *s, type value) 3863d4abf0Sagc 3963d4abf0Sagc declare_pushf(voidptr, void *); 40d714042bSchristos declare_pushf(long, long); 4163d4abf0Sagc 4263d4abf0Sagc /* Each tre_stack_pop_*(tre_stack_t *s) function pops the topmost 4363d4abf0Sagc element off of stack `s' and returns it. The stack must not be 4463d4abf0Sagc empty. */ 4563d4abf0Sagc #define declare_popf(typetag, type) \ 4663d4abf0Sagc type tre_stack_pop_ ## typetag(tre_stack_t *s) 4763d4abf0Sagc 4863d4abf0Sagc declare_popf(voidptr, void *); 49d714042bSchristos declare_popf(long, long); 50d714042bSchristos 51d714042bSchristos #define tre_stack_pop_int(stack) (int)tre_stack_pop_long(stack) 5263d4abf0Sagc 5363d4abf0Sagc /* Just to save some typing. */ 5463d4abf0Sagc #define STACK_PUSH(s, typetag, value) \ 5563d4abf0Sagc do \ 5663d4abf0Sagc { \ 5763d4abf0Sagc status = tre_stack_push_ ## typetag(s, value); \ 5863d4abf0Sagc } \ 59*8c408d61Srin while (/*CONSTCOND*/(void)0,0) 6063d4abf0Sagc 6163d4abf0Sagc #define STACK_PUSHX(s, typetag, value) \ 6263d4abf0Sagc { \ 6363d4abf0Sagc status = tre_stack_push_ ## typetag(s, value); \ 6463d4abf0Sagc if (status != REG_OK) \ 6563d4abf0Sagc break; \ 6663d4abf0Sagc } 6763d4abf0Sagc 6863d4abf0Sagc #define STACK_PUSHR(s, typetag, value) \ 6963d4abf0Sagc { \ 7063d4abf0Sagc reg_errcode_t _status; \ 7163d4abf0Sagc _status = tre_stack_push_ ## typetag(s, value); \ 7263d4abf0Sagc if (_status != REG_OK) \ 7363d4abf0Sagc return _status; \ 7463d4abf0Sagc } 7563d4abf0Sagc 7663d4abf0Sagc #endif /* TRE_STACK_H */ 7763d4abf0Sagc 7863d4abf0Sagc /* EOF */ 79