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/*
* Simple string buffer
*
* Copyright (C) 2017 Christian Franke
*
* This file is part of FRR.
*
* FRR 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.
*
* FRR 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 FRR; see the file COPYING. If not, write to the Free
* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*/
#include <zebra.h>
#include "sbuf.h"
#include "memory.h"
void sbuf_init(struct sbuf *dest, char *buf, size_t size)
{
dest->fixed = (size > 0);
if (dest->fixed) {
dest->buf = buf;
dest->size = size;
} else {
dest->buf = XMALLOC(MTYPE_TMP, 4096);
dest->size = 4096;
}
dest->pos = 0;
dest->buf[0] = '\0';
}
void sbuf_reset(struct sbuf *dest)
{
dest->pos = 0;
dest->buf[0] = '\0';
}
const char *sbuf_buf(struct sbuf *buf)
{
return buf->buf;
}
void sbuf_free(struct sbuf *buf)
{
if (!buf->fixed)
XFREE(MTYPE_TMP, buf->buf);
}
void sbuf_push(struct sbuf *buf, int indent, const char *format, ...)
{
va_list args;
int written;
if (!buf->fixed) {
char dummy;
int written1, written2;
size_t new_size;
written1 = snprintf(&dummy, 0, "%*s", indent, "");
va_start(args, format);
written2 = vsnprintf(&dummy, 0, format, args);
va_end(args);
new_size = buf->size;
if (written1 >= 0 && written2 >= 0) {
while (buf->pos + written1 + written2 >= new_size)
new_size *= 2;
if (new_size > buf->size) {
buf->buf =
XREALLOC(MTYPE_TMP, buf->buf, new_size);
buf->size = new_size;
}
}
}
written = snprintf(buf->buf + buf->pos, buf->size - buf->pos, "%*s",
indent, "");
if (written >= 0)
buf->pos += written;
if (buf->pos > buf->size)
buf->pos = buf->size;
va_start(args, format);
written = vsnprintf(buf->buf + buf->pos, buf->size - buf->pos, format,
args);
va_end(args);
if (written >= 0)
buf->pos += written;
if (buf->pos > buf->size)
buf->pos = buf->size;
if (buf->pos == buf->size)
assert(!"Buffer filled up!");
}
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