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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 <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 *buf)
{
free(buf->buf);
free(buf);
}
void strbuf_clear(struct strbuf *buf)
{
assert(buf->alloc > 0);
buf->len = 0;
buf->buf[0] = '\0';
}
/* Ensures that the buffer can be extended by num characters
* without touching malloc/realloc.
*/
static void strbuf_grow(struct strbuf *buf, int num)
{
if (buf->len + num + 1 > buf->alloc)
{
while (buf->len + num + 1 > buf->alloc)
buf->alloc *= 2; /* huge grow = infinite loop */
buf->buf = realloc(buf->buf, buf->alloc);
if (!buf->buf)
{
puts("Error while allocating memory for string buffer.");
exit(5);
}
}
}
struct strbuf *strbuf_append_char(struct strbuf *buf, char c)
{
strbuf_grow(buf, 1);
buf->buf[buf->len++] = c;
buf->buf[buf->len] = '\0';
return buf;
}
struct strbuf *strbuf_append_str(struct strbuf *buf, char *str)
{
int len = strlen(str);
strbuf_grow(buf, len);
assert(buf->len + len < buf->alloc);
strcpy(buf->buf + buf->len, str);
buf->len += len;
return buf;
}
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