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/*
* This file is part of libESMTP, a library for submission of RFC 2822
* formatted electronic mail messages using the SMTP protocol described
* in RFC 2821.
*
* Copyright (C) 2001,2002 Brian Stafford <brian@stafford.uklinux.net>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/* Stuff to maintain a dynamically sized buffer for a string. I seem
to keep writing code like this, so I've put it in a file by itself.
Maybe I should consolidate some other string buffering code with this.
NOTE: no \0 terminating strings
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <assert.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdarg.h>
#include <missing.h> /* declarations for missing library functions */
#include "concatenate.h"
/* malloc/realloc the buffer to be the requested length.
Return 0 on failure, non-zero otherwise */
static int
cat_alloc (struct catbuf *catbuf, size_t length)
{
char *nbuf;
assert (catbuf != NULL && length > 0);
if (catbuf->buffer == NULL)
catbuf->buffer = malloc (length);
else
{
nbuf = realloc (catbuf->buffer, length);
if (nbuf == NULL)
free (catbuf->buffer);
catbuf->buffer = nbuf;
}
catbuf->allocated = (catbuf->buffer == NULL) ? 0 : length;
if (catbuf->allocated < catbuf->string_length)
catbuf->string_length = catbuf->allocated;
return catbuf->buffer != NULL;
}
/* Reset the string to zero length without freeing the allocated memory */
void
cat_reset (struct catbuf *catbuf, size_t minimum_length)
{
assert (catbuf != NULL);
catbuf->string_length = 0;
if (minimum_length > catbuf->allocated)
cat_alloc (catbuf, minimum_length);
}
/* Initialise a buffer */
void
cat_init (struct catbuf *catbuf, size_t minimum_length)
{
assert (catbuf != NULL);
memset (catbuf, 0, sizeof (struct catbuf));
if (minimum_length > 0)
cat_alloc (catbuf, minimum_length);
}
/* Free memory allocated to the buffer */
void
cat_free (struct catbuf *catbuf)
{
assert (catbuf != NULL);
if (catbuf->buffer != NULL)
free (catbuf->buffer);
memset (catbuf, 0, sizeof (struct catbuf));
}
/* Return a pointer to the buffer and put its length in *len. */
char *
cat_buffer (struct catbuf *catbuf, int *len)
{
assert (catbuf != NULL);
if (len != NULL)
*len = catbuf->string_length;
return catbuf->buffer;
}
/* Shrink the allocated memory to the minimum needed. Return a
pointer to the buffer and put its length in *len. */
char *
cat_shrink (struct catbuf *catbuf, int *len)
{
assert (catbuf != NULL);
if (catbuf->buffer != NULL)
cat_alloc (catbuf, catbuf->string_length);
if (len != NULL)
*len = catbuf->string_length;
return catbuf->buffer;
}
/* Concatenate a string to the buffer. N.B. the buffer is NOT terminated
by a \0. If len < 0 then string must be \0 terminated. */
char *
concatenate (struct catbuf *catbuf, const char *string, int len)
{
size_t shortfall;
assert (catbuf != NULL && string != NULL);
if (len < 0)
len = strlen (string);
if (len > 0)
{
/* Ensure that the buffer is big enough to accept the string */
if (catbuf->buffer == NULL)
shortfall = 512;
else
shortfall = len - (catbuf->allocated - catbuf->string_length);
if (shortfall > 0)
{
if (shortfall % 128 != 0)
shortfall += 128 - shortfall % 128;
if (!cat_alloc (catbuf, catbuf->allocated + shortfall))
return NULL;
}
/* Copy the string */
memcpy (catbuf->buffer + catbuf->string_length, string, len);
catbuf->string_length += len;
}
return catbuf->buffer;
}
char *
vconcatenate (struct catbuf *catbuf, ...)
{
va_list alist;
const char *string;
assert (catbuf != NULL);
va_start (alist, catbuf);
while ((string = va_arg (alist, const char *)) != NULL)
concatenate (catbuf, string, -1);
va_end (alist);
return catbuf->buffer;
}
int
cat_printf (struct catbuf *catbuf, const char *format, ...)
{
va_list alist;
char buf[1024];
int len;
assert (catbuf != NULL && format != NULL);
va_start (alist, format);
len = vsnprintf (buf, sizeof buf, format, alist);
va_end (alist);
if (len <= 0)
return len;
if (len >= (int) sizeof buf)
len = sizeof buf;
concatenate (catbuf, buf, len);
return len;
}
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