349 lines
9.8 KiB
C
349 lines
9.8 KiB
C
/****************************************************************************
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* Copyright (c) 1998-2010,2012 Free Software Foundation, Inc. *
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* *
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* Permission is hereby granted, free of charge, to any person obtaining a *
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* copy of this software and associated documentation files (the *
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* "Software"), to deal in the Software without restriction, including *
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* without limitation the rights to use, copy, modify, merge, publish, *
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* distribute, distribute with modifications, sublicense, and/or sell *
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* copies of the Software, and to permit persons to whom the Software is *
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* furnished to do so, subject to the following conditions: *
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* *
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* The above copyright notice and this permission notice shall be included *
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* in all copies or substantial portions of the Software. *
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* *
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
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* IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
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* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
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* THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
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* *
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* Except as contained in this notice, the name(s) of the above copyright *
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* holders shall not be used in advertising or otherwise to promote the *
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* sale, use or other dealings in this Software without prior written *
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* authorization. *
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****************************************************************************/
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/***************************************************************************
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* *
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* Author : Juergen Pfeifer *
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* *
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***************************************************************************/
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#include "form.priv.h"
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MODULE_ID("$Id: fty_regex.c,v 1.25 2012/10/27 20:12:53 tom Exp $")
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#if HAVE_REGEX_H_FUNCS /* We prefer POSIX regex */
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#include <regex.h>
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typedef struct
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{
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regex_t *pRegExp;
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unsigned long *refCount;
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}
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RegExp_Arg;
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#elif HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS
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#undef RETURN
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static int reg_errno;
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static char *
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RegEx_Init(char *instring)
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{
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reg_errno = 0;
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return instring;
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}
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static char *
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RegEx_Error(int code)
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{
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reg_errno = code;
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return 0;
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}
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#define INIT register char *sp = RegEx_Init(instring);
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#define GETC() (*sp++)
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#define PEEKC() (*sp)
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#define UNGETC(c) (--sp)
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#define RETURN(c) return(c)
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#define ERROR(c) return RegEx_Error(c)
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#if HAVE_REGEXP_H_FUNCS
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#include <regexp.h>
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#else
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#include <regexpr.h>
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#endif
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typedef struct
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{
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char *compiled_expression;
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unsigned long *refCount;
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}
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RegExp_Arg;
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/* Maximum Length we allow for a compiled regular expression */
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#define MAX_RX_LEN (2048)
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#define RX_INCREMENT (256)
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#endif
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#if HAVE_REGEX_H_FUNCS | HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS
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# define MAYBE_UNUSED
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#else
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# define MAYBE_UNUSED GCC_UNUSED
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#endif
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/*---------------------------------------------------------------------------
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| Facility : libnform
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| Function : static void *Generic_RegularExpression_Type(void * arg)
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| Description : Allocate structure for regex type argument.
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| Return Values : Pointer to argument structure or NULL on error
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+--------------------------------------------------------------------------*/
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static void *
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Generic_RegularExpression_Type(void *arg MAYBE_UNUSED)
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{
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#if HAVE_REGEX_H_FUNCS
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char *rx = (char *)arg;
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RegExp_Arg *preg = (RegExp_Arg *)0;
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if (rx)
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{
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preg = typeMalloc(RegExp_Arg, 1);
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if (preg)
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{
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T((T_CREATE("RegExp_Arg %p"), (void *)preg));
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if (((preg->pRegExp = typeMalloc(regex_t, 1)) != 0)
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&& !regcomp(preg->pRegExp, rx,
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(REG_EXTENDED | REG_NOSUB | REG_NEWLINE)))
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{
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T((T_CREATE("regex_t %p"), (void *)preg->pRegExp));
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if ((preg->refCount = typeMalloc(unsigned long, 1)) != 0)
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*(preg->refCount) = 1;
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}
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else
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{
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if (preg->pRegExp)
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free(preg->pRegExp);
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free(preg);
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preg = (RegExp_Arg *)0;
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}
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}
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}
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return ((void *)preg);
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#elif HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS
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char *rx = (char *)arg;
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RegExp_Arg *pArg = (RegExp_Arg *)0;
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if (rx)
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{
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pArg = typeMalloc(RegExp_Arg, 1);
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if (pArg)
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{
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int blen = RX_INCREMENT;
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T((T_CREATE("RegExp_Arg %p"), pArg));
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pArg->compiled_expression = NULL;
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if ((pArg->refCount = typeMalloc(unsigned long, 1)) != 0)
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*(pArg->refCount) = 1;
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do
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{
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char *buf = typeMalloc(char, blen);
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if (buf)
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{
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#if HAVE_REGEXP_H_FUNCS
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char *last_pos = compile(rx, buf, &buf[blen], '\0');
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#else /* HAVE_REGEXPR_H_FUNCS */
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char *last_pos = compile(rx, buf, &buf[blen]);
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#endif
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if (reg_errno)
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{
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free(buf);
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if (reg_errno == 50)
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blen += RX_INCREMENT;
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else
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{
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free(pArg);
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pArg = NULL;
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break;
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}
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}
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else
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{
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pArg->compiled_expression = buf;
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break;
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}
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}
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}
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while (blen <= MAX_RX_LEN);
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}
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if (pArg && !pArg->compiled_expression)
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{
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free(pArg);
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pArg = NULL;
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}
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}
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return (void *)pArg;
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#else
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return 0;
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#endif
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}
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/*---------------------------------------------------------------------------
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| Facility : libnform
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| Function : static void *Make_RegularExpression_Type(va_list * ap)
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| Description : Allocate structure for regex type argument.
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| Return Values : Pointer to argument structure or NULL on error
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+--------------------------------------------------------------------------*/
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static void *
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Make_RegularExpression_Type(va_list *ap)
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{
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char *rx = va_arg(*ap, char *);
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return Generic_RegularExpression_Type((void *)rx);
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}
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/*---------------------------------------------------------------------------
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| Facility : libnform
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| Function : static void *Copy_RegularExpression_Type(
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| const void * argp)
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| Description : Copy structure for regex type argument.
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| Return Values : Pointer to argument structure or NULL on error.
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+--------------------------------------------------------------------------*/
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static void *
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Copy_RegularExpression_Type(const void *argp MAYBE_UNUSED)
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{
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#if (HAVE_REGEX_H_FUNCS | HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS)
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const RegExp_Arg *ap = (const RegExp_Arg *)argp;
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const RegExp_Arg *result = (const RegExp_Arg *)0;
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if (ap)
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{
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*(ap->refCount) += 1;
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result = ap;
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}
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return (void *)result;
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#else
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return 0;
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#endif
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}
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/*---------------------------------------------------------------------------
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| Facility : libnform
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| Function : static void Free_RegularExpression_Type(void * argp)
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| Description : Free structure for regex type argument.
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| Return Values : -
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+--------------------------------------------------------------------------*/
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static void
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Free_RegularExpression_Type(void *argp MAYBE_UNUSED)
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{
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#if HAVE_REGEX_H_FUNCS | HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS
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RegExp_Arg *ap = (RegExp_Arg *)argp;
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if (ap)
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{
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if (--(*(ap->refCount)) == 0)
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{
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#if HAVE_REGEX_H_FUNCS
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if (ap->pRegExp)
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{
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free(ap->refCount);
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regfree(ap->pRegExp);
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}
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#elif HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS
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if (ap->compiled_expression)
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{
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free(ap->refCount);
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free(ap->compiled_expression);
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}
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#endif
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free(ap);
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}
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}
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#endif
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}
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/*---------------------------------------------------------------------------
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| Facility : libnform
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| Function : static bool Check_RegularExpression_Field(
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| FIELD * field,
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| const void * argp)
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| Description : Validate buffer content to be a valid regular expression
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| Return Values : TRUE - field is valid
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| FALSE - field is invalid
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+--------------------------------------------------------------------------*/
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static bool
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Check_RegularExpression_Field(FIELD *field MAYBE_UNUSED,
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const void *argp MAYBE_UNUSED)
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{
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bool match = FALSE;
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#if HAVE_REGEX_H_FUNCS
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const RegExp_Arg *ap = (const RegExp_Arg *)argp;
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if (ap && ap->pRegExp)
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match = (regexec(ap->pRegExp, field_buffer(field, 0), 0, NULL, 0)
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? FALSE
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: TRUE);
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#elif HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS
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RegExp_Arg *ap = (RegExp_Arg *)argp;
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if (ap && ap->compiled_expression)
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match = (step(field_buffer(field, 0), ap->compiled_expression)
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? TRUE
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: FALSE);
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#endif
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return match;
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}
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static FIELDTYPE typeREGEXP =
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{
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_HAS_ARGS | _RESIDENT,
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1, /* this is mutable, so we can't be const */
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(FIELDTYPE *)0,
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(FIELDTYPE *)0,
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Make_RegularExpression_Type,
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Copy_RegularExpression_Type,
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Free_RegularExpression_Type,
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INIT_FT_FUNC(Check_RegularExpression_Field),
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INIT_FT_FUNC(NULL),
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INIT_FT_FUNC(NULL),
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INIT_FT_FUNC(NULL),
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#if NCURSES_INTEROP_FUNCS
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Generic_RegularExpression_Type
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#endif
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};
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NCURSES_EXPORT_VAR(FIELDTYPE*) TYPE_REGEXP = &typeREGEXP;
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#if NCURSES_INTEROP_FUNCS
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/* The next routines are to simplify the use of ncurses from
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programming languages with restictions on interop with C level
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constructs (e.g. variable access or va_list + ellipsis constructs)
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*/
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NCURSES_EXPORT(FIELDTYPE *)
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_nc_TYPE_REGEXP(void)
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{
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return TYPE_REGEXP;
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}
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#endif
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/* fty_regex.c ends here */
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