mirror of
https://git.osgeo.org/gitea/postgis/postgis
synced 2024-10-25 01:22:47 +00:00
701469d92b
git-svn-id: http://svn.osgeo.org/postgis/trunk@5462 b70326c6-7e19-0410-871a-916f4a2858ee
233 lines
6.2 KiB
C
233 lines
6.2 KiB
C
/**********************************************************************
|
|
* $Id$
|
|
*
|
|
* PostGIS - Spatial Types for PostgreSQL
|
|
* Copyright 2002 Thamer Alharbash
|
|
* Copyright 2009 Paul Ramsey <pramsey@cleverelephant.ca>
|
|
*
|
|
* Redistribution and use in source and binary forms, with or
|
|
* without modification, are permitted provided that the following
|
|
* conditions are met:
|
|
*
|
|
* Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
*
|
|
* 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.
|
|
*
|
|
* The name of the author may not be used to endorse or promote
|
|
* products derived from this software without specific prior
|
|
* written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 THE AUTHOR
|
|
* 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.
|
|
*
|
|
**********************************************************************/
|
|
|
|
|
|
#include "liblwgeom.h"
|
|
|
|
/**
|
|
* Allocate a new stringbuffer_t. Use stringbuffer_destroy to free.
|
|
*/
|
|
stringbuffer_t* stringbuffer_create(void)
|
|
{
|
|
stringbuffer_t *s;
|
|
|
|
s = lwalloc(sizeof(stringbuffer_t));
|
|
s->str_start = lwalloc(sizeof(char) * STRINGBUFFER_STARTSIZE);
|
|
s->str_end = s->str_start;
|
|
s->capacity = STRINGBUFFER_STARTSIZE;
|
|
memset(s->str_start,0,STRINGBUFFER_STARTSIZE);
|
|
return s;
|
|
}
|
|
|
|
/**
|
|
* Free the stringbuffer_t and all memory managed within it.
|
|
*/
|
|
void stringbuffer_destroy(stringbuffer_t *s)
|
|
{
|
|
if( s->str_start ) lwfree(s->str_start);
|
|
if( s ) lwfree(s);
|
|
}
|
|
|
|
/**
|
|
* Reset the stringbuffer_t. Useful for starting a fresh string
|
|
* without the expense of freeing and re-allocating a new
|
|
* stringbuffer_t.
|
|
*/
|
|
void stringbuffer_clear(stringbuffer_t *s)
|
|
{
|
|
s->str_start[0] = '\0';
|
|
s->str_end = s->str_start;
|
|
}
|
|
|
|
/**
|
|
* If necessary, expand the stringbuffer_t internal buffer to accomodate the
|
|
* specified additional size.
|
|
*/
|
|
static 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, sizeof(char) * capacity);
|
|
s->capacity = capacity;
|
|
s->str_end = s->str_start + current_size;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Append the specified string to the stringbuffer_t.
|
|
*/
|
|
void stringbuffer_append(stringbuffer_t *s, const char *a)
|
|
{
|
|
int alen = strlen(a); /* Length of string to append */
|
|
int alen0 = alen + 1; /* Length including null terminator */
|
|
|
|
stringbuffer_makeroom(s, alen0);
|
|
memcpy(s->str_end, a, alen0);
|
|
s->str_end += alen;
|
|
}
|
|
|
|
/**
|
|
* Returns a reference to the internal string being managed by
|
|
* the stringbuffer. The current string will be null-terminated
|
|
* within the internal string.
|
|
*/
|
|
const char* stringbuffer_getstring(stringbuffer_t *s)
|
|
{
|
|
return s->str_start;
|
|
}
|
|
|
|
/**
|
|
* Returns a newly allocated string large enough to contain the
|
|
* current state of the string. Caller is responsible for
|
|
* freeing the return value.
|
|
*/
|
|
char* stringbuffer_getstringcopy(stringbuffer_t *s)
|
|
{
|
|
size_t size = (s->str_end - s->str_start) + 1;
|
|
char *str = lwalloc(size);
|
|
memcpy(str, s->str_start, size);
|
|
str[size - 1] = '\0';
|
|
return str;
|
|
}
|
|
|
|
/**
|
|
* Returns the length of the current string, not including the
|
|
* null terminator (same behavior as strlen()).
|
|
*/
|
|
int stringbuffer_getlength(stringbuffer_t *s)
|
|
{
|
|
return (s->str_end - s->str_start);
|
|
}
|
|
|
|
/**
|
|
* Clear the stringbuffer_t and re-start it with the specified string.
|
|
*/
|
|
void stringbuffer_set(stringbuffer_t *s, const char *str)
|
|
{
|
|
stringbuffer_clear(s);
|
|
stringbuffer_append(s, str);
|
|
}
|
|
|
|
/**
|
|
* Copy the contents of src into dst.
|
|
*/
|
|
void stringbuffer_copy(stringbuffer_t *dst, stringbuffer_t *src)
|
|
{
|
|
stringbuffer_set(dst, stringbuffer_getstring(src));
|
|
}
|
|
|
|
/**
|
|
* Appends a formatted string to the current string buffer,
|
|
* using the format and argument list provided. Returns -1 on error,
|
|
* check errno for reasons, documented in the printf man page.
|
|
*/
|
|
static int stringbuffer_avprintf(stringbuffer_t *s, const char *fmt, va_list ap)
|
|
{
|
|
int maxlen = (s->capacity - (s->str_end - s->str_start));
|
|
int len = 0; /* Length of the output */
|
|
va_list ap2;
|
|
|
|
/* Make a copy of the variadic arguments, in case we need to print twice */
|
|
va_copy(ap2, ap);
|
|
|
|
/* Print to our buffer */
|
|
len = vsnprintf(s->str_end, maxlen, fmt, ap);
|
|
|
|
/* Propogate any printing errors upwards (check errno for info) */
|
|
if( len < 0 )
|
|
return -1;
|
|
|
|
/* If we had enough space, return the number of characters printed */
|
|
if( len < maxlen )
|
|
{
|
|
s->str_end += len;
|
|
return len;
|
|
}
|
|
|
|
/* We didn't have enough space! Expand the buffer. */
|
|
stringbuffer_makeroom(s, len + 1);
|
|
maxlen = (s->capacity - (s->str_end - s->str_start));
|
|
|
|
/* Try to print a second time */
|
|
len = vsnprintf(s->str_end, maxlen, fmt, ap2);
|
|
|
|
/* Printing error or too long still? Error! */
|
|
if( len < 0 || len >= maxlen )
|
|
return -1;
|
|
|
|
/* Move end pointer forward and return. */
|
|
s->str_end += len;
|
|
return len;
|
|
}
|
|
|
|
/**
|
|
* Appends a formatted string to the current string buffer,
|
|
* using the format and argument list provided.
|
|
* Returns -1 on error, check errno for reasons,
|
|
* as documented in the printf man page.
|
|
*/
|
|
int stringbuffer_aprintf(stringbuffer_t *s, const char *fmt, ...)
|
|
{
|
|
int r;
|
|
va_list ap;
|
|
va_start(ap, fmt);
|
|
r = stringbuffer_avprintf(s, fmt, ap);
|
|
va_end(ap);
|
|
return r;
|
|
}
|
|
|
|
/**
|
|
* Synonym for stringbuffer_aprintf
|
|
* TODO: Remove this.
|
|
*/
|
|
int stringbuffer_vasbappend(stringbuffer_t *s, const char *fmt, ... )
|
|
{
|
|
int r;
|
|
va_list ap;
|
|
va_start(ap, fmt);
|
|
r = stringbuffer_avprintf(s, fmt, ap);
|
|
va_end(ap);
|
|
return r;
|
|
} |