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/* A set of expandable list utilities, implimented as macros. */
/* Copyright 2006 Graeme W. Gill */
#ifndef _XLIST_H_
#ifdef __cplusplus
extern "C" {
#endif
/* An expanding list structure */
#define XLIST(objtype, name) \
struct { \
int no; /* Number of items in list */ \
int _no; /* Allocated size of list */ \
int objsz; /* Size of object */ \
objtype *list; /* list */ \
} name;
/* Initialize the list */
#define XLIST_INIT(objtype, xlp) \
((xlp)->no = (xlp)->_no = 0, \
(xlp)->objsz = sizeof(objtype), \
(xlp)->list = NULL \
)
/* test if the list is empty */
#define IS_XLIST_EMPTY(xlp) \
((xlp)->no == 0)
/* Return the number of items in the list */
#define XLIST_NO(xlp) \
((xlp)->no)
/* Return the n'th item in the list */
#define XLIST_ITEM(xlp, n) \
((xlp)->list[n])
/* Add an item to the end of a list */
/* We call error() if malloc failes */
#define XLIST_ADD(xlp, obj) \
{ \
if ((xlp)->_no <= 0) { \
(xlp)->_no = 10; \
if (((xlp)->list = malloc((xlp)->objsz * (xlp)->_no)) == NULL) \
error("XLIST malloc failed on %d items of size %d", (xlp)->objsz, (xlp)->_no); \
} else if ((xlp)->_no <= (xlp)->no) { \
(xlp)->_no *= 2; \
if (((xlp)->list = realloc((xlp)->list, (xlp)->objsz * (xlp)->_no)) == NULL) \
error("XLIST realloc failed on %d items of size %d", (xlp)->objsz, (xlp)->_no); \
} \
(xlp)->list[(xlp)->no++] = (obj); \
}
/* Free up the list */
#define XLIST_FREE(xlp) \
{ if ((xlp)->_no > 0) free((xlp)->list); }
#ifdef __cplusplus
}
#endif
#define _XLIST_H_
#endif /* _XLIST_H_ */
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