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gbuf.c
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/*
* Copyright 2008-2013 Various Authors
* Copyright 2008 Timo Hirvonen
*
* This code is largely based on strbuf in the GIT version control system.
*
* This program 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 program 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 <http://www.gnu.org/licenses/>.
*/
#include "gbuf.h"
#include "xmalloc.h"
#include <stdio.h>
#include <stdarg.h>
char gbuf_empty_buffer[1];
static inline void gbuf_init(struct gbuf *buf)
{
buf->buffer = gbuf_empty_buffer;
buf->alloc = 0;
buf->len = 0;
}
void gbuf_grow(struct gbuf *buf, size_t more)
{
size_t align = 16 - 1;
size_t alloc = (buf->len + more + 1 + align) & ~align;
if (alloc > buf->alloc) {
if (!buf->alloc)
buf->buffer = NULL;
buf->alloc = alloc;
buf->buffer = xrealloc(buf->buffer, buf->alloc);
// gbuf is not NUL terminated if this was first alloc
buf->buffer[buf->len] = 0;
}
}
void gbuf_free(struct gbuf *buf)
{
if (buf->alloc)
free(buf->buffer);
gbuf_init(buf);
}
void gbuf_add_ch(struct gbuf *buf, char ch)
{
gbuf_grow(buf, 1);
buf->buffer[buf->len++] = ch;
buf->buffer[buf->len] = 0;
}
void gbuf_add_bytes(struct gbuf *buf, const void *data, size_t len)
{
gbuf_grow(buf, len);
memcpy(buf->buffer + buf->len, data, len);
buf->len += len;
buf->buffer[buf->len] = 0;
}
void gbuf_add_str(struct gbuf *buf, const char *str)
{
int len = strlen(str);
if (!len)
return;
gbuf_grow(buf, len);
memcpy(buf->buffer + buf->len, str, len + 1);
buf->len += len;
}
void gbuf_addf(struct gbuf *buf, const char *fmt, ...)
{
va_list ap;
int slen;
va_start(ap, fmt);
slen = vsnprintf(buf->buffer + buf->len, buf->alloc - buf->len, fmt, ap);
va_end(ap);
if (slen > gbuf_avail(buf)) {
gbuf_grow(buf, slen + 1);
va_start(ap, fmt);
slen = vsnprintf(buf->buffer + buf->len, buf->alloc - buf->len, fmt, ap);
va_end(ap);
}
buf->len += slen;
}
void gbuf_set(struct gbuf *buf, int c, size_t count)
{
gbuf_grow(buf, count);
memset(buf->buffer + buf->len, c, count);
buf->len += count;
buf->buffer[buf->len] = 0;
}
char *gbuf_steal(struct gbuf *buf)
{
char *b = buf->buffer;
if (!buf->alloc)
b = xnew0(char, 1);
gbuf_init(buf);
return b;
}