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/*
strbuf.c - string buffer implementation
Copyright (C) 2009 RedHat inc.
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, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "strbuf.h"
#include <stdlib.h>
#include <stdio.h>
#include <assert.h>
#include <string.h>
struct strbuf *strbuf_new()
{
struct strbuf *buf = malloc(sizeof(struct strbuf));
if (!buf)
{
puts("Error while allocating memory for string buffer.");
exit(5);
}
buf->alloc = 8;
buf->len = 0;
buf->buf = malloc(buf->alloc);
if (!buf->buf)
{
puts("Error while allocating memory for string buffer.");
exit(5);
}
buf->buf[buf->len] = '\0';
return buf;
}
void strbuf_free(struct strbuf *strbuf)
{
free(strbuf->buf);
free(strbuf);
}
void strbuf_free_nobuf(struct strbuf *strbuf)
{
free(strbuf);
}
void strbuf_clear(struct strbuf *strbuf)
{
assert(strbuf->alloc > 0);
strbuf->len = 0;
strbuf->buf[0] = '\0';
}
/* Ensures that the buffer can be extended by num characters
* without touching malloc/realloc.
*/
static void strbuf_grow(struct strbuf *strbuf, int num)
{
if (strbuf->len + num + 1 > strbuf->alloc)
{
while (strbuf->len + num + 1 > strbuf->alloc)
strbuf->alloc *= 2; /* huge grow = infinite loop */
strbuf->buf = realloc(strbuf->buf, strbuf->alloc);
if (!strbuf->buf)
{
puts("Error while allocating memory for string buffer.");
exit(5);
}
}
}
struct strbuf *strbuf_append_char(struct strbuf *strbuf, char c)
{
strbuf_grow(strbuf, 1);
strbuf->buf[strbuf->len++] = c;
strbuf->buf[strbuf->len] = '\0';
return strbuf;
}
struct strbuf *strbuf_append_str(struct strbuf *strbuf, char *str)
{
int len = strlen(str);
strbuf_grow(strbuf, len);
assert(strbuf->len + len < strbuf->alloc);
strcpy(strbuf->buf + strbuf->len, str);
strbuf->len += len;
return strbuf;
}
struct strbuf *strbuf_prepend_str(struct strbuf *strbuf, char *str)
{
int len = strlen(str);
strbuf_grow(strbuf, len);
assert(strbuf->len + len < strbuf->alloc);
memmove(strbuf->buf + len, strbuf->buf, strbuf->len + 1);
memcpy(strbuf->buf, str, len);
return strbuf;
}
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