Current File : //backups/router/usr/local/include/syslog-ng/str-utils.h
/*
* Copyright (c) 2002-2012 Balabit
* Copyright (c) 1998-2012 Balázs Scheidler
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* As an additional exemption you are allowed to compile & link against the
* OpenSSL libraries as published by the OpenSSL project. See the file
* COPYING for details.
*
*/
#ifndef STR_UTILS_H_INCLUDED
#define STR_UTILS_H_INCLUDED 1
#include "syslog-ng.h"
#include <string.h>
/* functions that should be implemented by GLib but they aren't */
GString *g_string_assign_len(GString *s, const gchar *val, gint len);
gchar *g_string_steal(GString *s);
static inline GString *
g_string_append_unichar_optimized(GString *string, gunichar wc)
{
if (wc < 0x80)
g_string_append_c(string, (gchar) wc);
else
g_string_append_unichar(string, wc);
return string;
}
/*
* DO NOT USE THIS MACRO UNLESS STRICTLY NECESSARY FOR PERFORMANCE REASONS.
*
* This macro tries hard to zero-terminate the string without moving it to a
* new buffer.
*
* It is expected to be used at sites where the length is known and where
* the input string is expected to be properly NUL terminated but not always.
*
* The macro checks if the string is indeed NUL terminated and if it is it
* just assigns the original pointer to dest. If it's not, it allocates a
* new string via g_alloca() so it is automatically freed when the current
* scope exits.
*
* This does not work as an inline function as we use g_alloca() and that
* would be freed when the inline function exits (e.g. when it is in fact
* not inlined).
*/
#define APPEND_ZERO(dest, value, value_len) \
do { \
gchar *__buf; \
if (G_UNLIKELY(value[value_len] != 0)) \
{ \
/* value is NOT zero terminated */ \
\
__buf = g_alloca(value_len + 1); \
memcpy(__buf, value, value_len); \
__buf[value_len] = 0; \
} \
else \
{ \
/* value is zero terminated */ \
__buf = (gchar *) value; \
} \
dest = __buf; \
} while (0)
gchar *__normalize_key(const gchar *buffer);
gchar *normalize_flag(const gchar *buffer);
/* This version of strchr() is optimized for cases where the string we are
* looking up characters in is often zero or one character in length. In
* those cases we can avoid the strchr() call, which can make a tight loop
* doing a lot of strchr() calls a lot faster, especially as this function
* is inlined.
*
* Naming: I originally wanted to use the original function as a prefix
* (strchr), however that would potentially pollute the namespace of the
* library that we are optimizing. So I've added an underscore prefix in
* order not to clash, with that it is still obvious that it intends to
* behave the same as strchr().
*
* NOTE: don't use this unless strchr() really shows up in your profile.
*/
static inline const char *
_strchr_optimized_for_single_char_haystack(const char *str, int c)
{
if (str[0] == c)
return str;
else if (str[0] == '\0')
return NULL;
if (str[1] == '\0')
{
if (c != '\0')
return NULL;
else
return &str[1];
}
return strchr(str + 1, c);
}
/*
* strsplit() splits the `str` into `maxtokens` pieces.
* This version skips multiple `delims`.
*
*/
static inline
gchar **strsplit(const gchar *str, char delim, gint maxtokens)
{
if (!str || delim == '\0')
return NULL;
const gchar *delim_pos = NULL;
const gchar *remainder = str;
GPtrArray *array = g_ptr_array_new();
if (maxtokens < 1)
maxtokens = G_MAXINT;
for (delim_pos = strchr(remainder, delim); delim_pos && maxtokens; maxtokens--)
{
const gchar *d = delim_pos;
while (d && *d++ == delim);
if (!d)
break;
--d;
gint len = delim_pos - remainder;
if (len > 0)
g_ptr_array_add(array, g_strndup(remainder, len));
remainder = d;
delim_pos = strchr(remainder, delim);
}
if (remainder)
g_ptr_array_add(array, g_strdup(remainder));
g_ptr_array_add(array, NULL);
return (gchar **) g_ptr_array_free(array, FALSE);
}
#endif
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