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https://git.osgeo.org/gitea/postgis/postgis
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131 lines
3 KiB
C
131 lines
3 KiB
C
/**********************************************************************
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* $Id$
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*
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* PostGIS - Spatial Types for PostgreSQL
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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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* This is free software; you can redistribute and/or modify it under
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* the terms of the GNU General Public Licence. See the COPYING file.
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*
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**********************************************************************/
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#include "liblwgeom.h"
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stringbuffer_t *stringbuffer_create(void)
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{
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stringbuffer_t *sb;
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sb = lwalloc(sizeof(stringbuffer_t));
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sb->length = 0;
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sb->capacity = STRINGBUFFER_STARTSIZE;
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sb->str = lwalloc(sizeof(char) * STRINGBUFFER_STARTSIZE);
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memset(sb->str,0,STRINGBUFFER_STARTSIZE);
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memset(sb->buffer,0,STRINGBUFFER_WORKSIZE);
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return sb;
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}
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void stringbuffer_destroy(stringbuffer_t *sb)
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{
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lwfree(sb->str);
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lwfree(sb);
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}
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void stringbuffer_clear(stringbuffer_t *sb)
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{
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sb->str[0] = '\0';
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sb->length = 0;
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memset(sb->buffer,0,STRINGBUFFER_WORKSIZE);
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}
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static void stringbuffer_makeroom(stringbuffer_t *sb, size_t length_to_add)
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{
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size_t reqd_capacity = sb->capacity;
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while(reqd_capacity < (length_to_add + sb->length))
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reqd_capacity *= 2;
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if( reqd_capacity > sb->capacity )
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{
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sb->str = lwrealloc(sb->str, sizeof(char) * reqd_capacity);
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sb->capacity = reqd_capacity;
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}
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}
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void stringbuffer_append(stringbuffer_t *sb, const char *s)
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{
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int slen = strlen(s); /* Length of string to append */
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int slen0 = slen + 1; /* Length including null terminator */
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stringbuffer_makeroom(sb, slen0);
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memcpy(sb->str + sb->length, s, slen0);
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sb->length += slen;
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sb->str[sb->length] = '\0';
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}
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const char *stringbuffer_getstring(stringbuffer_t *sb)
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{
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return sb->str;
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}
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void stringbuffer_set(stringbuffer_t *sb, const char *s)
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{
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stringbuffer_clear(sb);
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stringbuffer_append(sb, s);
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}
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void stringbuffer_copy(stringbuffer_t *sb, stringbuffer_t *src)
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{
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stringbuffer_set(sb, stringbuffer_getstring(src));
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}
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static void stringbuffer_avprintf(stringbuffer_t *sb, const char *fmt, va_list ap)
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{
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int len = 0; /* Length of the output */
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int len0 = 0; /* Length of the output with null terminator */
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va_list ap2;
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va_copy(ap2, ap);
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/* Print to our static buffer */
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len = vsnprintf(sb->buffer, STRINGBUFFER_WORKSIZE, fmt, ap);
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len0 = len + 1;
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stringbuffer_makeroom(sb, len0);
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/* This output doesn't fit in our static buffer, allocate a dynamic one */
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if( len0 > STRINGBUFFER_WORKSIZE )
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{
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char *tmpstr = lwalloc(sizeof(char) * len0);
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vsnprintf(tmpstr, len0, fmt, ap2);
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memcpy(sb->str + sb->length, tmpstr, len0);
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lwfree(tmpstr);
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}
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/* Copy the result out of the static buffer */
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else
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{
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memcpy(sb->str + sb->length, sb->buffer, len0);
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}
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sb->length += len;
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sb->str[sb->length] = '\0';
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}
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void stringbuffer_aprintf(stringbuffer_t *sb, const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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stringbuffer_avprintf(sb, fmt, ap);
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va_end(ap);
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}
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void stringbuffer_vasbappend(stringbuffer_t *sb, const char *fmt, ... )
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{
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va_list ap;
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va_start(ap, fmt);
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stringbuffer_avprintf(sb, fmt, ap);
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va_end(ap);
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} |