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| Current File : //usr/src/contrib/ncurses/form/fty_regex.c |
/****************************************************************************
* Copyright (c) 1998-2006,2007 Free Software Foundation, Inc. *
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* Permission is hereby granted, free of charge, to any person obtaining a *
* copy of this software and associated documentation files (the *
* "Software"), to deal in the Software without restriction, including *
* without limitation the rights to use, copy, modify, merge, publish, *
* distribute, distribute with modifications, sublicense, and/or sell *
* copies of the Software, and to permit persons to whom the Software is *
* furnished to do so, subject to the following conditions: *
* *
* The above copyright notice and this permission notice shall be included *
* in all copies or substantial portions of the Software. *
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
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****************************************************************************/
/***************************************************************************
* *
* Author : Juergen Pfeifer *
* *
***************************************************************************/
#include "form.priv.h"
MODULE_ID("$Id: fty_regex.c,v 1.21 2007/10/13 19:33:50 tom Exp $")
#if HAVE_REGEX_H_FUNCS /* We prefer POSIX regex */
#include <regex.h>
typedef struct
{
regex_t *pRegExp;
unsigned long *refCount;
}
RegExp_Arg;
#elif HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS
#undef RETURN
static int reg_errno;
static char *
RegEx_Init(char *instring)
{
reg_errno = 0;
return instring;
}
static char *
RegEx_Error(int code)
{
reg_errno = code;
return 0;
}
#define INIT register char *sp = RegEx_Init(instring);
#define GETC() (*sp++)
#define PEEKC() (*sp)
#define UNGETC(c) (--sp)
#define RETURN(c) return(c)
#define ERROR(c) return RegEx_Error(c)
#if HAVE_REGEXP_H_FUNCS
#include <regexp.h>
#else
#include <regexpr.h>
#endif
typedef struct
{
char *compiled_expression;
unsigned long *refCount;
}
RegExp_Arg;
/* Maximum Length we allow for a compiled regular expression */
#define MAX_RX_LEN (2048)
#define RX_INCREMENT (256)
#endif
/*---------------------------------------------------------------------------
| Facility : libnform
| Function : static void *Make_RegularExpression_Type(va_list * ap)
|
| Description : Allocate structure for regex type argument.
|
| Return Values : Pointer to argument structure or NULL on error
+--------------------------------------------------------------------------*/
static void *
Make_RegularExpression_Type(va_list *ap)
{
#if HAVE_REGEX_H_FUNCS
char *rx = va_arg(*ap, char *);
RegExp_Arg *preg;
preg = typeMalloc(RegExp_Arg, 1);
if (preg)
{
T((T_CREATE("RegExp_Arg %p"), preg));
if (((preg->pRegExp = typeMalloc(regex_t, 1)) != 0)
&& !regcomp(preg->pRegExp, rx,
(REG_EXTENDED | REG_NOSUB | REG_NEWLINE)))
{
T((T_CREATE("regex_t %p"), preg->pRegExp));
preg->refCount = typeMalloc(unsigned long, 1);
*(preg->refCount) = 1;
}
else
{
if (preg->pRegExp)
free(preg->pRegExp);
free(preg);
preg = (RegExp_Arg *)0;
}
}
return ((void *)preg);
#elif HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS
char *rx = va_arg(*ap, char *);
RegExp_Arg *pArg;
pArg = typeMalloc(RegExp_Arg, 1);
if (pArg)
{
int blen = RX_INCREMENT;
T((T_CREATE("RegExp_Arg %p"), pArg));
pArg->compiled_expression = NULL;
pArg->refCount = typeMalloc(unsigned long, 1);
*(pArg->refCount) = 1;
do
{
char *buf = typeMalloc(char, blen);
if (buf)
{
#if HAVE_REGEXP_H_FUNCS
char *last_pos = compile(rx, buf, &buf[blen], '\0');
#else /* HAVE_REGEXPR_H_FUNCS */
char *last_pos = compile(rx, buf, &buf[blen]);
#endif
if (reg_errno)
{
free(buf);
if (reg_errno == 50)
blen += RX_INCREMENT;
else
{
free(pArg);
pArg = NULL;
break;
}
}
else
{
pArg->compiled_expression = buf;
break;
}
}
}
while (blen <= MAX_RX_LEN);
}
if (pArg && !pArg->compiled_expression)
{
free(pArg);
pArg = NULL;
}
return (void *)pArg;
#else
return 0;
#endif
}
/*---------------------------------------------------------------------------
| Facility : libnform
| Function : static void *Copy_RegularExpression_Type(
| const void * argp)
|
| Description : Copy structure for regex type argument.
|
| Return Values : Pointer to argument structure or NULL on error.
+--------------------------------------------------------------------------*/
static void *
Copy_RegularExpression_Type(const void *argp)
{
#if (HAVE_REGEX_H_FUNCS | HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS)
const RegExp_Arg *ap = (const RegExp_Arg *)argp;
const RegExp_Arg *result = (const RegExp_Arg *)0;
if (ap)
{
*(ap->refCount) += 1;
result = ap;
}
return (void *)result;
#else
return 0;
#endif
}
/*---------------------------------------------------------------------------
| Facility : libnform
| Function : static void Free_RegularExpression_Type(void * argp)
|
| Description : Free structure for regex type argument.
|
| Return Values : -
+--------------------------------------------------------------------------*/
static void
Free_RegularExpression_Type(void *argp)
{
#if HAVE_REGEX_H_FUNCS | HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS
RegExp_Arg *ap = (RegExp_Arg *)argp;
if (ap)
{
if (--(*(ap->refCount)) == 0)
{
#if HAVE_REGEX_H_FUNCS
if (ap->pRegExp)
{
free(ap->refCount);
regfree(ap->pRegExp);
}
#elif HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS
if (ap->compiled_expression)
{
free(ap->refCount);
free(ap->compiled_expression);
}
#endif
free(ap);
}
}
#endif
}
/*---------------------------------------------------------------------------
| Facility : libnform
| Function : static bool Check_RegularExpression_Field(
| FIELD * field,
| const void * argp)
|
| Description : Validate buffer content to be a valid regular expression
|
| Return Values : TRUE - field is valid
| FALSE - field is invalid
+--------------------------------------------------------------------------*/
static bool
Check_RegularExpression_Field(FIELD *field, const void *argp)
{
bool match = FALSE;
#if HAVE_REGEX_H_FUNCS
const RegExp_Arg *ap = (const RegExp_Arg *)argp;
if (ap && ap->pRegExp)
match = (regexec(ap->pRegExp, field_buffer(field, 0), 0, NULL, 0)
? FALSE
: TRUE);
#elif HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS
RegExp_Arg *ap = (RegExp_Arg *)argp;
if (ap && ap->compiled_expression)
match = (step(field_buffer(field, 0), ap->compiled_expression)
? TRUE
: FALSE);
#endif
return match;
}
static FIELDTYPE typeREGEXP =
{
_HAS_ARGS | _RESIDENT,
1, /* this is mutable, so we can't be const */
(FIELDTYPE *)0,
(FIELDTYPE *)0,
Make_RegularExpression_Type,
Copy_RegularExpression_Type,
Free_RegularExpression_Type,
Check_RegularExpression_Field,
NULL,
NULL,
NULL
};
NCURSES_EXPORT_VAR(FIELDTYPE*) TYPE_REGEXP = &typeREGEXP;
/* fty_regex.c ends here */