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/* Some string handling
* Copyright (C) 2010 Chris Hall (GMCH), Highwayman
*
* This file is part of GNU Zebra.
*
* GNU Zebra 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, or (at your
* option) any later version.
*
* GNU Zebra 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 GNU Zebra; see the file COPYING. If not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "qstring.h"
#include "memory.h"
#include "zassert.h"
/*==============================================================================
*/
/*------------------------------------------------------------------------------
* Initialise qstring -- allocate if required.
*
* If non-zero len is given, a body is allocated (for at least len + 1).
*
* Returns: address of qstring
*
* NB: assumes initialising a new structure. If not, then caller should
* use qs_reset() or qs_set_empty().
*/
extern qstring
qs_init_new(qstring qs, size_t len)
{
if (qs == NULL)
qs = XCALLOC(MTYPE_QSTRING, sizeof(qstring_t)) ;
else
memset(qs, 0, sizeof(qstring_t)) ;
/* Zeroising has set:
*
* body = NULL -- no body
* size = 0 -- no body
*
* len = 0
* cp = 0
*
* Nothing more to do unless initial size != 0
*/
if (len != 0)
qs_alloc(qs, len) ;
return qs ;
} ;
/*------------------------------------------------------------------------------
* Allocate or reallocate so that string is big enough for the given length.
*
* Allocates to 16 byte boundaries.
*
* Returns: the number of bytes *allocated*, which includes the byte for
* possible trailing '\0'.
*
* NB: allocates EXTRA space for trailing '\0' beyond given length.
*/
extern size_t
qs_alloc(qstring qs, size_t len)
{
len = (len + 0x10) & ~(size_t)(0x10 - 1) ;
if (qs->body == NULL)
{
assert(qs->size == 0) ;
qs->size = len ;
qs->body = XMALLOC(MTYPE_QSTRING_BODY, qs->size) ;
}
else
{
assert(qs->size > 0) ;
qs->size *= 2 ;
if (qs->size < len)
qs->size = len ;
qs->body = XREALLOC(MTYPE_QSTRING_BODY, qs->body, qs->size) ;
} ;
return qs->size ;
} ;
/*------------------------------------------------------------------------------
* Free body of qstring -- zeroise size, len and cp
*/
extern void
qs_free_body(qstring qs)
{
if (qs->body != NULL)
XFREE(MTYPE_QSTRING_BODY, qs->body) ; /* sets qs->body = NULL */
qs->size = 0 ;
qs->len = 0 ;
qs->cp = 0 ;
} ;
/*------------------------------------------------------------------------------
* Reset qstring -- free body and, if required, free the structure.
*
* If not freeing the structure, zeroise size, len and cp -- qs_free_body()
*
* Returns: NULL if freed the structure
* address of structure, otherwise
*/
extern qstring
qs_reset(qstring qs, int free_structure)
{
if (qs->body != NULL)
XFREE(MTYPE_QSTRING_BODY, qs->body) ; /* sets qs->body = NULL */
if (free_structure)
XFREE(MTYPE_QSTRING, qs) ; /* sets qs = NULL */
else
{
qs->size = 0 ;
qs->len = 0 ;
qs->cp = 0 ;
} ;
return qs ;
} ;
/*==============================================================================
* printf(0 and vprintf() type functions
*/
/*------------------------------------------------------------------------------
* Formatted print to qstring -- cf printf()
*/
extern int
qs_printf(qstring qs, const char* format, ...)
{
va_list args;
int result ;
va_start (args, format);
result = qs_vprintf(qs, format, args);
va_end (args);
return result;
} ;
/*------------------------------------------------------------------------------
* Formatted print to qstring -- cf vprintf()
*
* Note that vsnprintf() returns the length of what it would like to have
* produced, if it had the space. That length does not include the trailing
* '\0'.
*
* Also note that given a zero length the string address may be NULL, and the
* result is still the length required.
*/
extern int
qs_vprintf(qstring qs, const char *format, va_list args)
{
va_list ac ;
int len ;
while (1)
{
va_copy(ac, args);
qs->len = len = vsnprintf (qs->body, qs->size, format, ac) ;
va_end(ac);
if (len < (int)qs->size)
return len ; /* quit if done (or error) */
qs_alloc(qs, len) ;
} ;
} ;
/*==============================================================================
* Other operations
*/
/*------------------------------------------------------------------------------
* Set qstring to be copy of the given string.
*
* Sets qs->len to the length of the string (excluding trailing '\0')
*
* NB: if stc == NULL, sets qstring to be zero length string.
*/
extern size_t
qs_set(qstring qs, const char* src)
{
qs_set_len(qs, (src != NULL) ? strlen(src) : 0) ;
if (qs->len != 0)
memcpy(qs->body, src, qs->len + 1) ;
else
*((char*)qs->body) = '\0' ;
return qs->len ;
} ;
/*------------------------------------------------------------------------------
* Set qstring to be leading 'n' bytes of given string.
*
* NB: src string MUST be at least that long.
*
* NB: src may not be NULL unless len == 0.
*/
extern size_t
qs_set_n(qstring qs, const char* src, size_t n)
{
qs_need(qs, n) ; /* sets qs->len */
if (n != 0)
memcpy(qs->body, src, n) ;
*((char*)qs->body + n) = '\0' ;
return n ;
} ;
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