3 * THIS CODE IS SPECIFICALLY EXEMPTED FROM THE NCURSES PACKAGE COPYRIGHT.
4 * You may freely copy it for use as a template for your own field types.
5 * If you develop a field type that might be of general use, please send
6 * it back to the ncurses maintainers for inclusion in the next version.
8 /***************************************************************************
10 * Author : Juergen Pfeifer, juergen.pfeifer@gmx.net *
12 ***************************************************************************/
14 #include "form.priv.h"
16 MODULE_ID("$Id: fty_regex.c,v 1.15 2000/12/09 23:46:12 tom Exp $")
18 #if HAVE_REGEX_H_FUNCS /* We prefer POSIX regex */
24 unsigned long *refCount;
27 #elif HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS
31 static char *RegEx_Init(char *instring)
37 static char *RegEx_Error(int code)
43 #define INIT register char *sp = RegEx_Init(instring);
44 #define GETC() (*sp++)
46 #define UNGETC(c) (--sp)
47 #define RETURN(c) return(c)
48 #define ERROR(c) return RegEx_Error(c)
50 #if HAVE_REGEXP_H_FUNCS
58 char *compiled_expression;
59 unsigned long *refCount;
62 /* Maximum Length we allow for a compiled regular expression */
63 #define MAX_RX_LEN (2048)
64 #define RX_INCREMENT (256)
68 /*---------------------------------------------------------------------------
70 | Function : static void *Make_RegularExpression_Type(va_list * ap)
72 | Description : Allocate structure for regex type argument.
74 | Return Values : Pointer to argument structure or NULL on error
75 +--------------------------------------------------------------------------*/
76 static void *Make_RegularExpression_Type(va_list * ap)
78 #if HAVE_REGEX_H_FUNCS
79 char *rx = va_arg(*ap,char *);
82 preg = (RegExp_Arg*)malloc(sizeof(RegExp_Arg));
85 if (((preg->pRegExp = (regex_t*)malloc(sizeof(regex_t))) != (regex_t*)0)
86 && !regcomp(preg->pRegExp,rx,
87 (REG_EXTENDED | REG_NOSUB | REG_NEWLINE) ))
89 preg->refCount = (unsigned long *)malloc(sizeof(unsigned long));
90 *(preg->refCount) = 1;
97 preg = (RegExp_Arg*)0;
100 return((void *)preg);
101 #elif HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS
102 char *rx = va_arg(*ap,char *);
105 pArg = (RegExp_Arg *)malloc(sizeof(RegExp_Arg));
109 int blen = RX_INCREMENT;
110 pArg->compiled_expression = NULL;
111 pArg->refCount = (unsigned long *)malloc(sizeof(unsigned long));
112 *(pArg->refCount) = 1;
115 char *buf = (char *)malloc(blen);
118 #if HAVE_REGEXP_H_FUNCS
119 char *last_pos = compile (rx, buf, &buf[blen], '\0');
120 #else /* HAVE_REGEXPR_H_FUNCS */
121 char *last_pos = compile (rx, buf, &buf[blen]);
127 blen += RX_INCREMENT;
137 pArg->compiled_expression = buf;
141 } while( blen <= MAX_RX_LEN );
143 if (pArg && !pArg->compiled_expression)
154 /*---------------------------------------------------------------------------
155 | Facility : libnform
156 | Function : static void *Copy_RegularExpression_Type(
159 | Description : Copy structure for regex type argument.
161 | Return Values : Pointer to argument structure or NULL on error.
162 +--------------------------------------------------------------------------*/
163 static void *Copy_RegularExpression_Type(const void * argp)
165 #if (HAVE_REGEX_H_FUNCS | HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS)
166 const RegExp_Arg *ap = (const RegExp_Arg *)argp;
167 const RegExp_Arg *result = (const RegExp_Arg *)0;
171 *(ap->refCount) += 1;
174 return (void *)result;
180 /*---------------------------------------------------------------------------
181 | Facility : libnform
182 | Function : static void Free_RegularExpression_Type(void * argp)
184 | Description : Free structure for regex type argument.
187 +--------------------------------------------------------------------------*/
188 static void Free_RegularExpression_Type(void * argp)
190 #if HAVE_REGEX_H_FUNCS | HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS
191 RegExp_Arg *ap = (RegExp_Arg *)argp;
194 if (--(*(ap->refCount)) == 0)
196 #if HAVE_REGEX_H_FUNCS
200 regfree(ap->pRegExp);
202 #elif HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS
203 if (ap->compiled_expression)
206 free(ap->compiled_expression);
215 /*---------------------------------------------------------------------------
216 | Facility : libnform
217 | Function : static bool Check_RegularExpression_Field(
221 | Description : Validate buffer content to be a valid regular expression
223 | Return Values : TRUE - field is valid
224 | FALSE - field is invalid
225 +--------------------------------------------------------------------------*/
226 static bool Check_RegularExpression_Field(FIELD * field, const void * argp)
229 #if HAVE_REGEX_H_FUNCS
230 const RegExp_Arg *ap = (const RegExp_Arg*)argp;
231 if (ap && ap->pRegExp)
232 match = (regexec(ap->pRegExp,field_buffer(field,0),0,NULL,0) ? FALSE:TRUE);
233 #elif HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS
234 RegExp_Arg *ap = (RegExp_Arg *)argp;
235 if (ap && ap->compiled_expression)
236 match = (step(field_buffer(field,0),ap->compiled_expression) ? TRUE:FALSE);
241 static FIELDTYPE typeREGEXP = {
242 _HAS_ARGS | _RESIDENT,
243 1, /* this is mutable, so we can't be const */
246 Make_RegularExpression_Type,
247 Copy_RegularExpression_Type,
248 Free_RegularExpression_Type,
249 Check_RegularExpression_Field,
255 NCURSES_EXPORT_VAR(FIELDTYPE*) TYPE_REGEXP = &typeREGEXP;
257 /* fty_regex.c ends here */