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/*
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 "abrtlib.h"
int prefixcmp(const char *str, const char *prefix)
{
for (; ; str++, prefix++)
if (!*prefix)
return 0;
else if (*str != *prefix)
return (unsigned char)*prefix - (unsigned char)*str;
}
int suffixcmp(const char *str, const char *suffix)
{
int len_minus_suflen = strlen(str) - strlen(suffix);
if (len_minus_suflen < 0)
return len_minus_suflen;
else
return strcmp(str + len_minus_suflen, suffix);
}
struct strbuf *strbuf_new(void)
{
struct strbuf *buf = xzalloc(sizeof(*buf));
/*buf->len = 0; - done by xzalloc */
buf->alloc = 8;
buf->buf = xzalloc(8);
return buf;
}
void strbuf_free(struct strbuf *strbuf)
{
if (!strbuf)
return;
free(strbuf->buf);
free(strbuf);
}
char *strbuf_free_nobuf(struct strbuf *strbuf)
{
char *ret = strbuf->buf;
free(strbuf);
return ret;
}
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 N+1 characters
* without touching malloc/realloc.
* Returns pointer where appended chars can be stored by the caller;
* increments ->len by N (therefore callers don't need to do it).
*/
static char *strbuf_grow(struct strbuf *strbuf, unsigned increment)
{
unsigned len = strbuf->len;
unsigned need = strbuf->len = len + increment;
unsigned cur_size = strbuf->alloc;
if (cur_size <= need)
{
while (cur_size <= need)
cur_size += 64 + cur_size / 8;
strbuf->alloc = cur_size;
strbuf->buf = xrealloc(strbuf->buf, cur_size);
}
char *p = strbuf->buf + len;
return p;
}
struct strbuf *strbuf_append_char(struct strbuf *strbuf, char c)
{
char *p = strbuf_grow(strbuf, 1);
*p++ = c;
*p = '\0';
return strbuf;
}
struct strbuf *strbuf_append_str(struct strbuf *strbuf, const char *str)
{
unsigned len = strlen(str);
char *p = strbuf_grow(strbuf, len);
assert(strbuf->len < strbuf->alloc);
strcpy(p, str);
return strbuf;
}
struct strbuf *strbuf_prepend_str(struct strbuf *strbuf, const char *str)
{
unsigned cur_len = strbuf->len;
unsigned inc_len = strlen(str);
strbuf_grow(strbuf, inc_len);
assert(strbuf->len < strbuf->alloc);
memmove(strbuf->buf + inc_len, strbuf->buf, cur_len);
memcpy(strbuf->buf, str, inc_len);
return strbuf;
}
struct strbuf *strbuf_append_strf(struct strbuf *strbuf, const char *format, ...)
{
va_list p;
char *string_ptr;
va_start(p, format);
string_ptr = xvasprintf(format, p);
va_end(p);
strbuf_append_str(strbuf, string_ptr);
free(string_ptr);
return strbuf;
}
struct strbuf *strbuf_prepend_strf(struct strbuf *strbuf, const char *format, ...)
{
va_list p;
char *string_ptr;
va_start(p, format);
string_ptr = xvasprintf(format, p);
va_end(p);
strbuf_prepend_str(strbuf, string_ptr);
free(string_ptr);
return strbuf;
}
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