stringbuffer.h

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