/usr/include/wvstreams/wvregex.h is in libwvstreams-dev 4.6.1-11.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* Worldvisions Weaver Software:
* Copyright (C) 1997-2004 Net Integration Technologies, Inc.
*
* Regular expression support though libc
*/
#ifndef __WVREGEX_H
#define __WVREGEX_H
#include "wverror.h"
#include "wvstring.h"
#include <sys/types.h>
#include <regex.h>
#define __WVRE_REG(n) __wvre_r##n
#define __WVRE_DECL_FORM(n) WvString &__WVRE_REG(n) = WvRegex::__wvre_null_reg
#define WVREGEX_REGS_DECL \
__WVRE_DECL_FORM( 0), __WVRE_DECL_FORM( 1), \
__WVRE_DECL_FORM( 2), __WVRE_DECL_FORM( 3), \
__WVRE_DECL_FORM( 4), __WVRE_DECL_FORM( 5), \
__WVRE_DECL_FORM( 6), __WVRE_DECL_FORM( 7), \
__WVRE_DECL_FORM( 8), __WVRE_DECL_FORM( 9), \
__WVRE_DECL_FORM(10), __WVRE_DECL_FORM(11), \
__WVRE_DECL_FORM(12), __WVRE_DECL_FORM(13), \
__WVRE_DECL_FORM(14), __WVRE_DECL_FORM(15), \
__WVRE_DECL_FORM(16), __WVRE_DECL_FORM(17), \
__WVRE_DECL_FORM(18), __WVRE_DECL_FORM(19)
#define __WVRE_CALL_FORM(n) __WVRE_REG(n)
#define WVREGEX_REGS_CALL \
__WVRE_CALL_FORM( 0), __WVRE_CALL_FORM( 1), \
__WVRE_CALL_FORM( 2), __WVRE_CALL_FORM( 3), \
__WVRE_CALL_FORM( 4), __WVRE_CALL_FORM( 5), \
__WVRE_CALL_FORM( 6), __WVRE_CALL_FORM( 7), \
__WVRE_CALL_FORM( 8), __WVRE_CALL_FORM( 9), \
__WVRE_CALL_FORM(10), __WVRE_CALL_FORM(11), \
__WVRE_CALL_FORM(12), __WVRE_CALL_FORM(13), \
__WVRE_CALL_FORM(14), __WVRE_CALL_FORM(15), \
__WVRE_CALL_FORM(16), __WVRE_CALL_FORM(17), \
__WVRE_CALL_FORM(18), __WVRE_CALL_FORM(19)
/*!
@brief WvRegex -- Unified support for regular expressions.
Supports matching compiled regular expressions and capturing substrings
in registers.
!*/
class WvRegex: public WvErrorBase
{
private:
bool have_preg;
regex_t preg;
bool match(WvStringParm string, int eflags,
size_t nmatch, regmatch_t pmatch[]) const;
virtual void seterr(int _errnum);
bool _match(WvStringParm string, int eflags,
int &match_start, int &match_end, WVREGEX_REGS_DECL) const
{
regmatch_t pmatch[21];
int nmatch = 1;
#define __WVRE_COUNT_REGS(n) \
if ( &__WVRE_REG(n) != &__wvre_null_reg) ++nmatch
__WVRE_COUNT_REGS( 0); __WVRE_COUNT_REGS( 1);
__WVRE_COUNT_REGS( 2); __WVRE_COUNT_REGS( 3);
__WVRE_COUNT_REGS( 4); __WVRE_COUNT_REGS( 5);
__WVRE_COUNT_REGS( 6); __WVRE_COUNT_REGS( 7);
__WVRE_COUNT_REGS( 8); __WVRE_COUNT_REGS( 9);
__WVRE_COUNT_REGS(10); __WVRE_COUNT_REGS(11);
__WVRE_COUNT_REGS(12); __WVRE_COUNT_REGS(13);
__WVRE_COUNT_REGS(14); __WVRE_COUNT_REGS(15);
__WVRE_COUNT_REGS(16); __WVRE_COUNT_REGS(17);
__WVRE_COUNT_REGS(18); __WVRE_COUNT_REGS(19);
if (!match(string, eflags, nmatch, pmatch)) return false;
match_start = pmatch[0].rm_so;
match_end = pmatch[0].rm_eo;
#define __WVRE_STORE_REGS(n) \
if (&__WVRE_REG(n) != &__wvre_null_reg \
&& pmatch[n+1].rm_so != -1 && pmatch[n+1].rm_eo != -1) \
{ \
int len = pmatch[n+1].rm_eo-pmatch[n+1].rm_so; \
__WVRE_REG(n).setsize(len+1); \
memcpy(__WVRE_REG(n).edit(), &string[pmatch[n+1].rm_so], len); \
__WVRE_REG(n).edit()[len] = '\0'; \
}
__WVRE_STORE_REGS( 0); __WVRE_STORE_REGS( 1);
__WVRE_STORE_REGS( 2); __WVRE_STORE_REGS( 3);
__WVRE_STORE_REGS( 4); __WVRE_STORE_REGS( 5);
__WVRE_STORE_REGS( 6); __WVRE_STORE_REGS( 7);
__WVRE_STORE_REGS( 8); __WVRE_STORE_REGS( 9);
__WVRE_STORE_REGS(10); __WVRE_STORE_REGS(11);
__WVRE_STORE_REGS(12); __WVRE_STORE_REGS(13);
__WVRE_STORE_REGS(14); __WVRE_STORE_REGS(15);
__WVRE_STORE_REGS(16); __WVRE_STORE_REGS(17);
__WVRE_STORE_REGS(18); __WVRE_STORE_REGS(19);
return true;
}
public:
//!
//! Flags that affect interpretation of the regex; used in Regex() and
//! set()
//!
enum CFlags {
// Use (obsolete) basic regex syntax (like grep). See regex(7).
BASIC = 0,
// Use extended regex syntax (like egrep). See regex(7).
EXTENDED = REG_EXTENDED,
// Case insensitive
ICASE = REG_ICASE,
// Do not collect match start and end or registers; faster
NOSUB = REG_NOSUB,
// Match-any-character operators don't match a newline. See regex(3)
NEWLINE = REG_NEWLINE
};
static const int default_cflags;
//!
//! Flags that affect matching of regex. Used in match() and
//! continuable_match()
//!
enum EFlags
{
// Matching begining of line always fails (unless NEWLINE cflag is set)
NOTBOL = REG_NOTBOL,
// Matching end of line always fails (unless NEWLINE cflag is set)
NOTEOL = REG_NOTEOL
};
static const int default_eflags;
//!
//! Internal use only
//!
static WvString __wvre_null_reg;
//!
//! Construct an empty regex object. Matches will always fail until set()
//! is called with a valid regex.
//!
WvRegex() : have_preg(false) {}
//!
//! Construct a regex object, compiling the given regex
//!
//! \param regex The new regular expression to match
//! \param cflags CFlags used to compile the regular expression;
//! the defaults are case sensitive, extended RE.
//!
WvRegex(WvStringParm regex, int cflags = default_cflags) : have_preg(false)
{ set(regex, cflags); }
~WvRegex();
//!
//! Replace the current regex to match with a new one.
//!
//! \param regex The new regular expression to match
//! \param cflags CFlags used to compile the regular expression;
//! the defaults are case sensitive, extended RE.
//!
bool set(WvStringParm regex, int cflags = default_cflags);
//!
//! Match a given string against the compiled regular expression
//!
//! \param string The string to match
//! \param (remaining) WvString registers to capture substring matches
//! as specified in the RE
//!
//! \code
//! extern WvString line;
//! WvString match;
//! if (re.match(line, match))
//! wvout->print("Matching substring is '%s'\n", match);
//! \endcode
//!
bool match(WvStringParm string, WVREGEX_REGS_DECL) const
{
int match_start, match_end;
return _match(string, default_eflags,
match_start, match_end, WVREGEX_REGS_CALL);
}
//!
//! Match a given string against the compiled regular expression
//!
//! \param string The string to match
//! \param eflags EFlags that affect matching
//! \param (remaining) WvString registers to capture substring matches
//! as specified in the RE
//!
bool match(WvStringParm string, int eflags, WVREGEX_REGS_DECL) const
{
int match_start, match_end;
return _match(string, eflags,
match_start, match_end, WVREGEX_REGS_CALL);
}
//!
//! Match a given string against the compiled regular expression,
//! capturing the start and end positions of the matching string.
//!
//! \param string The string to match
//! \param match_start If the match succeeds, the starting index of the
//! match in string
//! \param match_end If the match succeeds, the index of the character in
//! string following the last character of the match
//! \param (remaining) WvString registers to capture substring matches
//! as specified in the RE
//!
//! \code
//! extern WvString line;
//! int start = 0;
//! WvString match;
//! int match_start, match_end;
//! while (re.continuable_match(&line[start],
//! match_start, match_end, match))
//! {
//! wvout->print("Matching substring is '%s'@[%s,%s)\n",
//! match, match_start, match_end);
//! start += match_end;
//! }
//! \endcode
//!
bool continuable_match(WvStringParm string,
int &match_start, int &match_end,
WVREGEX_REGS_DECL) const
{
return _match(string, default_eflags,
match_start, match_end, WVREGEX_REGS_CALL);
}
//!
//! Match a given string against the compiled regular expression,
//! capturing the start and end positions of the matching string.
//!
//! \param string The string to match
//! \param eflags EFlags that affect matching
//! \param match_start If the match succeeds, the starting index of the
//! match in string
//! \param match_end If the match succeeds, the index of the character in
//! string following the last character of the match
//! \param (remaining) WvString registers to capture substring matches
//! as specified in the RE
//!
bool continuable_match(WvStringParm string, int eflags,
int &match_start, int &match_end,
WVREGEX_REGS_DECL) const
{
return _match(string, eflags,
match_start, match_end, WVREGEX_REGS_CALL);
}
};
#endif // __WVREGEX_H
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