107 lines
2.5 KiB
C++
107 lines
2.5 KiB
C++
/* buffer.c - String buffer manipulation tools.
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* Originally developped for the GeeXboX project.
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* Copyright (C) 2005-2007 Benjamin Zores <ben@geexbox.org>
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*
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* This program 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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* This program 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 Library 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 along
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* with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#include <stdio.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 "buffer.h"
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#include "minmax.h"
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#define BUFFER_DEFAULT_CAPACITY 32768
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struct buffer_t *
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buffer_new (void)
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{
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struct buffer_t *buffer = NULL;
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buffer = (struct buffer_t *) malloc (sizeof (struct buffer_t));
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if (!buffer)
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return NULL;
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buffer->buf = NULL;
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buffer->len = 0;
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buffer->capacity = 0;
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return buffer;
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}
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void
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buffer_append (struct buffer_t *buffer, const char *str)
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{
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size_t len;
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if (!buffer || !str)
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return;
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if (!buffer->buf)
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{
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buffer->capacity = BUFFER_DEFAULT_CAPACITY;
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buffer->buf = (char *) malloc (buffer->capacity * sizeof (char));
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memset (buffer->buf, '\0', buffer->capacity);
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}
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len = buffer->len + strlen (str);
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if (len >= buffer->capacity)
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{
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buffer->capacity = MAX (len + 1, 2 * buffer->capacity);
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buffer->buf = (char*)realloc (buffer->buf, buffer->capacity);
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}
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strcat (buffer->buf, str);
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buffer->len += strlen (str);
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}
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void
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buffer_appendf (struct buffer_t *buffer, const char *format, ...)
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{
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char str[BUFFER_DEFAULT_CAPACITY];
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int size;
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va_list va;
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if (!buffer || !format)
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return;
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va_start (va, format);
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size = vsnprintf (str, BUFFER_DEFAULT_CAPACITY, format, va);
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if (size >= BUFFER_DEFAULT_CAPACITY)
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{
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char* dynstr = (char *) malloc (size + 1);
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vsnprintf (dynstr, size + 1, format, va);
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buffer_append (buffer, dynstr);
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free (dynstr);
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}
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else
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buffer_append (buffer, str);
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va_end (va);
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}
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void
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buffer_free (struct buffer_t *buffer)
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{
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if (!buffer)
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return;
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if (buffer->buf)
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free (buffer->buf);
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free (buffer);
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}
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