fpm_arrays.h

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    /* (c) 2007,2008 Andrei Nigmatulin */
 
#ifndef FPM_ARRAYS_H
#define FPM_ARRAYS_H 1
 
#include <stdlib.h>
#include <string.h>
 
#include "php.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 = safe_perealloc(a->data, a->sz, new_allocated, 0, true);
 
        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