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|
/* $OpenBSD: fty_regex.c,v 1.4 1998/07/24 02:37:48 millert Exp $ */
/*
* THIS CODE IS SPECIFICALLY EXEMPTED FROM THE NCURSES PACKAGE COPYRIGHT.
* You may freely copy it for use as a template for your own field types.
* If you develop a field type that might be of general use, please send
* it back to the ncurses maintainers for inclusion in the next version.
*/
/***************************************************************************
* *
* Author : Juergen Pfeifer, Juergen.Pfeifer@T-Online.de *
* *
***************************************************************************/
#include "form.priv.h"
MODULE_ID("$From: fty_regex.c,v 1.11 1997/10/18 19:32:35 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 = (RegExp_Arg*)malloc(sizeof(RegExp_Arg));
if (preg)
{
if (((preg->pRegExp = (regex_t*)malloc(sizeof(regex_t))) != (regex_t*)0)
&& !regcomp(preg->pRegExp,rx,
(REG_EXTENDED | REG_NOSUB | REG_NEWLINE) ))
{
preg->refCount = (unsigned long *)malloc(sizeof(unsigned long));
*(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 = (RegExp_Arg *)malloc(sizeof(RegExp_Arg));
if (pArg)
{
int blen = RX_INCREMENT;
pArg->compiled_expression = NULL;
pArg->refCount = (unsigned long *)malloc(sizeof(unsigned long));
*(pArg->refCount) = 1;
do {
char *buf = (char *)malloc(blen);
if (buf)
{
#if HAVE_REGEXP_H_FUNCS
char *last_pos = compile (rx, buf, &buf[blen], '\0');
#else
char *last_pos = compile (rx, buf, &buf[blen], '\0');
#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
};
FIELDTYPE* TYPE_REGEXP = &typeREGEXP;
/* fty_regex.c ends here */
|
