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/*
* libdpkg - Debian packaging suite library routines
* varbuf.c - variable length expandable buffer handling
*
* Copyright © 1994,1995 Ian Jackson <ijackson@chiark.greenend.org.uk>
* Copyright © 2008-2015 Guillem Jover <guillem@debian.org>
*
* This 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 of the License, or
* (at your option) any later version.
*
* This 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 this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <compat.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <dpkg/i18n.h>
#include <dpkg/dpkg.h>
#include <dpkg/dpkg-db.h>
void
varbuf_add_char(struct varbuf *v, int c)
{
varbuf_grow(v, 1);
v->buf[v->used++]= c;
}
void
varbuf_dup_char(struct varbuf *v, int c, size_t n)
{
if (n == 0)
return;
varbuf_grow(v, n);
memset(v->buf + v->used, c, n);
v->used += n;
}
void
varbuf_map_char(struct varbuf *v, int c_src, int c_dst)
{
size_t i;
for (i = 0; i < v->used; i++)
if (v->buf[i] == c_src)
v->buf[i] = c_dst;
}
int
varbuf_printf(struct varbuf *v, const char *fmt, ...)
{
int r;
va_list args;
va_start(args, fmt);
r = varbuf_vprintf(v, fmt, args);
va_end(args);
return r;
}
int
varbuf_vprintf(struct varbuf *v, const char *fmt, va_list args)
{
va_list args_copy;
int needed, r;
va_copy(args_copy, args);
needed = vsnprintf(NULL, 0, fmt, args_copy);
va_end(args_copy);
if (needed < 0)
ohshite(_("error formatting string into varbuf variable"));
varbuf_grow(v, needed + 1);
r = vsnprintf(v->buf + v->used, needed + 1, fmt, args);
if (r < 0)
ohshite(_("error formatting string into varbuf variable"));
v->used += r;
return r;
}
void
varbuf_add_buf(struct varbuf *v, const void *s, size_t size)
{
if (size == 0)
return;
varbuf_grow(v, size);
memcpy(v->buf + v->used, s, size);
v->used += size;
}
void
varbuf_add_dir(struct varbuf *v, const char *dirname)
{
varbuf_add_str(v, dirname);
if (v->used == 0 || v->buf[v->used - 1] != '/')
varbuf_add_char(v, '/');
}
void
varbuf_end_str(struct varbuf *v)
{
varbuf_grow(v, 1);
v->buf[v->used] = '\0';
}
const char *
varbuf_get_str(struct varbuf *v)
{
varbuf_end_str(v);
return v->buf;
}
struct varbuf *
varbuf_new(size_t size)
{
struct varbuf *v;
v = m_malloc(sizeof(*v));
varbuf_init(v, size);
return v;
}
void
varbuf_init(struct varbuf *v, size_t size)
{
v->used = 0;
v->size = size;
if (size)
v->buf = m_malloc(size);
else
v->buf = NULL;
}
void
varbuf_reset(struct varbuf *v)
{
v->used= 0;
}
void
varbuf_grow(struct varbuf *v, size_t need_size)
{
size_t new_size;
/* Make sure the varbuf is in a sane state. */
if (v->size < v->used)
internerr("varbuf used(%zu) > size(%zu)", v->used, v->size);
/* Check if we already have enough room. */
if ((v->size - v->used) >= need_size)
return;
/* Check if we overflow. */
new_size = (v->size + need_size) * 2;
if (new_size < v->size)
ohshit(_("cannot grow varbuf to size %zu; it would overflow"), need_size);
v->size = new_size;
v->buf = m_realloc(v->buf, v->size);
}
void
varbuf_trunc(struct varbuf *v, size_t used_size)
{
/* Make sure the caller does not claim more than available. */
if (v->size < used_size)
internerr("varbuf new_used(%zu) > size(%zu)", used_size, v->size);
v->used = used_size;
}
void
varbuf_snapshot(struct varbuf *v, struct varbuf_state *vs)
{
vs->v = v;
vs->used = v->used;
}
void
varbuf_rollback(struct varbuf_state *vs)
{
varbuf_trunc(vs->v, vs->used);
}
size_t
varbuf_rollback_len(struct varbuf_state *vs)
{
if (vs->used > vs->v->used)
internerr("varbuf state_used(%zu) > used(%zu)", vs->used, vs->v->used);
return vs->v->used - vs->used;
}
const char *
varbuf_rollback_start(struct varbuf_state *vs)
{
if (vs->v->buf == NULL) {
if (vs->used)
internerr("varbuf buf(NULL) state_used(%zu) > 0", vs->used);
/* XXX: Ideally this would be handled by varbuf always having a valid
* buf or switching all users to the getter, but for now this will do. */
return "";
}
return vs->v->buf + vs->used;
}
char *
varbuf_detach(struct varbuf *v)
{
char *buf = v->buf;
v->buf = NULL;
v->size = 0;
v->used = 0;
return buf;
}
void
varbuf_destroy(struct varbuf *v)
{
free(v->buf); v->buf=NULL; v->size=0; v->used=0;
}
void
varbuf_free(struct varbuf *v)
{
free(v->buf);
free(v);
}
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