c23debb38a
Performance for large-amounts-of-small objects is about 10% faster. Performance for larger objects (natural earth admin for example) is 3%-5% slower.
128 lines
3.8 KiB
C
128 lines
3.8 KiB
C
/**********************************************************************
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*
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* PostGIS - Spatial Types for PostgreSQL
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* http://postgis.net
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*
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* PostGIS is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* PostGIS is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with PostGIS. If not, see <http://www.gnu.org/licenses/>.
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*
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**********************************************************************
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*
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* Copyright 2002 Thamer Alharbash
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* Copyright 2009 Paul Ramsey <pramsey@cleverelephant.ca>
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*
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**********************************************************************/
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#ifndef _STRINGBUFFER_H
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#define _STRINGBUFFER_H 1
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#include "liblwgeom_internal.h"
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#include <stdlib.h>
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#include <stdarg.h>
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#include <string.h>
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#include <stdio.h>
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#define STRINGBUFFER_STARTSIZE 128
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typedef struct
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{
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size_t capacity;
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char *str_end;
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char *str_start;
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}
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stringbuffer_t;
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extern stringbuffer_t *stringbuffer_create_with_size(size_t size);
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extern stringbuffer_t *stringbuffer_create(void);
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extern void stringbuffer_init(stringbuffer_t *s);
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extern void stringbuffer_init_varlena(stringbuffer_t *s);
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extern void stringbuffer_release(stringbuffer_t *s);
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extern void stringbuffer_destroy(stringbuffer_t *sb);
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extern void stringbuffer_clear(stringbuffer_t *sb);
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void stringbuffer_set(stringbuffer_t *sb, const char *s);
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void stringbuffer_copy(stringbuffer_t *sb, stringbuffer_t *src);
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extern int stringbuffer_aprintf(stringbuffer_t *sb, const char *fmt, ...);
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extern const char *stringbuffer_getstring(stringbuffer_t *sb);
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extern char *stringbuffer_getstringcopy(stringbuffer_t *sb);
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extern lwvarlena_t *stringbuffer_getvarlenacopy(stringbuffer_t *s);
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extern lwvarlena_t * stringbuffer_getvarlena(stringbuffer_t *s);
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extern int stringbuffer_getlength(stringbuffer_t *sb);
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extern char stringbuffer_lastchar(stringbuffer_t *s);
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extern int stringbuffer_trim_trailing_white(stringbuffer_t *s);
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extern int stringbuffer_trim_trailing_zeroes(stringbuffer_t *s);
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/**
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* If necessary, expand the stringbuffer_t internal buffer to accommodate the
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* specified additional size.
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*/
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static inline void
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stringbuffer_makeroom(stringbuffer_t *s, size_t size_to_add)
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{
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size_t current_size = (s->str_end - s->str_start);
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size_t capacity = s->capacity;
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size_t required_size = current_size + size_to_add;
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while (capacity < required_size)
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capacity *= 2;
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if (capacity > s->capacity)
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{
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s->str_start = lwrealloc(s->str_start, capacity);
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s->capacity = capacity;
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s->str_end = s->str_start + current_size;
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}
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}
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/**
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* Append the specified string to the stringbuffer_t using known length
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*/
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inline static void
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stringbuffer_append_len(stringbuffer_t *s, const char *a, size_t alen)
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{
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int alen0 = alen + 1; /* Length including null terminator */
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stringbuffer_makeroom(s, alen0);
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memcpy(s->str_end, a, alen0);
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s->str_end += alen;
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}
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/**
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* Append the specified string to the stringbuffer_t.
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*/
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inline static void
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stringbuffer_append(stringbuffer_t *s, const char *a)
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{
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int alen = strlen(a); /* Length of string to append */
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stringbuffer_append_len(s, a, alen);
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}
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inline static void
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stringbuffer_append_double(stringbuffer_t *s, double d, int precision)
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{
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stringbuffer_makeroom(s, OUT_MAX_BYTES_DOUBLE);
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s->str_end += lwprint_double(d, precision, s->str_end);
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}
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inline static void
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stringbuffer_append_char(stringbuffer_t *s, char c)
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{
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stringbuffer_makeroom(s, 1);
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*(s->str_end) = c;
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s->str_end++;
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}
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#endif /* _STRINGBUFFER_H */
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