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/*
* Copyright (c) 2013 Genome Research Ltd.
* Author(s): James Bonfield, Andrew Whitwham
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* 3. Neither the names Genome Research Ltd and Wellcome Trust Sanger
* Institute nor the names of its contributors may be used to endorse
* or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY GENOME RESEARCH LTD AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GENOME RESEARCH
* LTD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
A pooled string allocator intended to cut down on the
memory overhead of many small string allocations.
Andrew Whitwham, September 2010.
*/
#ifdef HAVE_CONFIG_H
#include "io_lib_config.h"
#endif
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include "string_alloc.h"
#define MIN_STR_SIZE 1024
/* creates the string pool. max_length is the initial size
a single string can be. Tha max_length can grow as
needed */
string_alloc_t *string_pool_create(size_t max_length) {
string_alloc_t *a_str;
if (NULL == (a_str = (string_alloc_t *)malloc(sizeof(*a_str)))) {
return NULL;
}
if (max_length < MIN_STR_SIZE) max_length = MIN_STR_SIZE;
a_str->nstrings = 0;
a_str->max_length = max_length;
a_str->strings = NULL;
return a_str;
}
/* internal function to do the actual memory allocation */
static string_t *new_string_pool(string_alloc_t *a_str) {
string_t *str;
str = realloc(a_str->strings, (a_str->nstrings + 1) * sizeof(*a_str->strings));
if (NULL == str) return NULL;
a_str->strings = str;
str = &a_str->strings[a_str->nstrings];
str->str = malloc(a_str->max_length);;
if (NULL == str->str) return NULL;
str->used = 0;
a_str->nstrings++;
return str;
}
/* free allocated memory */
void string_pool_destroy(string_alloc_t *a_str) {
size_t i;
for (i = 0; i < a_str->nstrings; i++) {
free(a_str->strings[i].str);
}
free(a_str->strings);
free(a_str);
}
/* allocate space for a string */
char *string_alloc(string_alloc_t *a_str, size_t length) {
string_t *str;
char *ret;
if (length <= 0) return NULL;
// add to last string pool if we have space
if (a_str->nstrings) {
str = &a_str->strings[a_str->nstrings - 1];
if (str->used + length < a_str->max_length) {
ret = str->str + str->used;
str->used += length;
return ret;
}
}
// increase the max length if needs be
if (length > a_str->max_length) a_str->max_length = length;
// need a new string pool
str = new_string_pool(a_str);
if (NULL == str) return NULL;
str->used = length;
return str->str;
}
/* equivalent to strdup */
char *string_dup(string_alloc_t *a_str, char *instr) {
return string_ndup(a_str, instr, strlen(instr));
}
char *string_ndup(string_alloc_t *a_str, char *instr, size_t len) {
char *str = string_alloc(a_str, len + 1);
if (NULL == str) return NULL;
memcpy(str, instr, len);
str[len] = 0;
return str;
}
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