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/* $Id: fpm_arrays.h,v 1.2 2008/05/24 17:38:47 anight Exp $ */
/* (c) 2007,2008 Andrei Nigmatulin */
#ifndef FPM_ARRAYS_H
#define FPM_ARRAYS_H 1
#include <stdlib.h>
#include <string.h>
struct fpm_array_s {
void *data;
size_t sz;
size_t used;
size_t allocated;
};
static inline struct fpm_array_s *fpm_array_init(struct fpm_array_s *a, unsigned int sz, unsigned int initial_num) /* {{{ */
{
void *allocated = 0;
if (!a) {
a = malloc(sizeof(struct fpm_array_s));
if (!a) {
return 0;
}
allocated = a;
}
a->sz = sz;
a->data = calloc(sz, initial_num);
if (!a->data) {
free(allocated);
return 0;
}
a->allocated = initial_num;
a->used = 0;
return a;
}
/* }}} */
static inline void *fpm_array_item(struct fpm_array_s *a, unsigned int n) /* {{{ */
{
char *ret;
ret = (char *) a->data + a->sz * n;
return ret;
}
/* }}} */
static inline void *fpm_array_item_last(struct fpm_array_s *a) /* {{{ */
{
return fpm_array_item(a, a->used - 1);
}
/* }}} */
static inline int fpm_array_item_remove(struct fpm_array_s *a, unsigned int n) /* {{{ */
{
int ret = -1;
if (n < a->used - 1) {
void *last = fpm_array_item(a, a->used - 1);
void *to_remove = fpm_array_item(a, n);
memcpy(to_remove, last, a->sz);
ret = n;
}
--a->used;
return ret;
}
/* }}} */
static inline void *fpm_array_push(struct fpm_array_s *a) /* {{{ */
{
void *ret;
if (a->used == a->allocated) {
size_t new_allocated = a->allocated ? a->allocated * 2 : 20;
void *new_ptr = realloc(a->data, a->sz * new_allocated);
if (!new_ptr) {
return 0;
}
a->data = new_ptr;
a->allocated = new_allocated;
}
ret = fpm_array_item(a, a->used);
++a->used;
return ret;
}
/* }}} */
static inline void fpm_array_free(struct fpm_array_s *a) /* {{{ */
{
free(a->data);
a->data = 0;
a->sz = 0;
a->used = a->allocated = 0;
}
/* }}} */
#endif
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