xref: /openbsd/lib/libform/fty_regex.c (revision e5dd7070) 
1 /*	$OpenBSD: fty_regex.c,v 1.9 2015/01/23 22:48:51 krw Exp $	*/
2 /****************************************************************************
3  * Copyright (c) 1998-2006,2007 Free Software Foundation, Inc.              *
4  *                                                                          *
5  * Permission is hereby granted, free of charge, to any person obtaining a  *
6  * copy of this software and associated documentation files (the            *
7  * "Software"), to deal in the Software without restriction, including      *
8  * without limitation the rights to use, copy, modify, merge, publish,      *
9  * distribute, distribute with modifications, sublicense, and/or sell       *
10  * copies of the Software, and to permit persons to whom the Software is    *
11  * furnished to do so, subject to the following conditions:                 *
12  *                                                                          *
13  * The above copyright notice and this permission notice shall be included  *
14  * in all copies or substantial portions of the Software.                   *
15  *                                                                          *
16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
17  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
18  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
19  * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
20  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
21  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
22  * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
23  *                                                                          *
24  * Except as contained in this notice, the name(s) of the above copyright   *
25  * holders shall not be used in advertising or otherwise to promote the     *
26  * sale, use or other dealings in this Software without prior written       *
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28  ****************************************************************************/
29 
30 /***************************************************************************
31 *                                                                          *
32 *  Author : Juergen Pfeifer                                                *
33 *                                                                          *
34 ***************************************************************************/
35 
36 #include "form.priv.h"
37 
38 MODULE_ID("$Id: fty_regex.c,v 1.9 2015/01/23 22:48:51 krw Exp $")
39 
40 #if HAVE_REGEX_H_FUNCS		/* We prefer POSIX regex */
41 #include <regex.h>
42 
43 typedef struct
44   {
45     regex_t *pRegExp;
46     unsigned long *refCount;
47   }
48 RegExp_Arg;
49 
50 #elif HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS
51 #undef RETURN
52 static int reg_errno;
53 
54 static char *
55 RegEx_Init(char *instring)
56 {
57   reg_errno = 0;
58   return instring;
59 }
60 
61 static char *
62 RegEx_Error(int code)
63 {
64   reg_errno = code;
65   return 0;
66 }
67 
68 #define INIT 		register char *sp = RegEx_Init(instring);
69 #define GETC()		(*sp++)
70 #define PEEKC()		(*sp)
71 #define UNGETC(c)	(--sp)
72 #define RETURN(c)	return(c)
73 #define ERROR(c)	return RegEx_Error(c)
74 
75 #if HAVE_REGEXP_H_FUNCS
76 #include <regexp.h>
77 #else
78 #include <regexpr.h>
79 #endif
80 
81 typedef struct
82 {
83   char *compiled_expression;
84   unsigned long *refCount;
85 }
86 RegExp_Arg;
87 
88 /* Maximum Length we allow for a compiled regular expression */
89 #define MAX_RX_LEN   (2048)
90 #define RX_INCREMENT (256)
91 
92 #endif
93 
94 /*---------------------------------------------------------------------------
95 |   Facility      :  libnform
96 |   Function      :  static void *Make_RegularExpression_Type(va_list * ap)
97 |
98 |   Description   :  Allocate structure for regex type argument.
99 |
100 |   Return Values :  Pointer to argument structure or NULL on error
101 +--------------------------------------------------------------------------*/
102 static void *
103 Make_RegularExpression_Type(va_list *ap)
104 {
105 #if HAVE_REGEX_H_FUNCS
106   char *rx = va_arg(*ap, char *);
107   RegExp_Arg *preg;
108 
109   preg = typeMalloc(RegExp_Arg, 1);
110 
111   if (preg)
112     {
113       T((T_CREATE("RegExp_Arg %p"), preg));
114       if (((preg->pRegExp = typeMalloc(regex_t, 1)) != 0)
115 	  && !regcomp(preg->pRegExp, rx,
116 		      (REG_EXTENDED | REG_NOSUB | REG_NEWLINE)))
117 	{
118 	  T((T_CREATE("regex_t %p"), preg->pRegExp));
119 	  preg->refCount = typeMalloc(unsigned long, 1);
120 
121 	  *(preg->refCount) = 1;
122 	}
123       else
124 	{
125 	  if (preg->pRegExp)
126 	    free(preg->pRegExp);
127 	  free(preg);
128 	  preg = (RegExp_Arg *)0;
129 	}
130     }
131   return ((void *)preg);
132 #elif HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS
133   char *rx = va_arg(*ap, char *);
134   RegExp_Arg *pArg;
135 
136   pArg = typeMalloc(RegExp_Arg, 1);
137 
138   if (pArg)
139     {
140       int blen = RX_INCREMENT;
141 
142       T((T_CREATE("RegExp_Arg %p"), pArg));
143       pArg->compiled_expression = NULL;
144       pArg->refCount = typeMalloc(unsigned long, 1);
145 
146       *(pArg->refCount) = 1;
147 
148       do
149 	{
150 	  char *buf = typeMalloc(char, blen);
151 
152 	  if (buf)
153 	    {
154 #if HAVE_REGEXP_H_FUNCS
155 	      char *last_pos = compile(rx, buf, &buf[blen], '\0');
156 
157 #else /* HAVE_REGEXPR_H_FUNCS */
158 	      char *last_pos = compile(rx, buf, &buf[blen]);
159 #endif
160 	      if (reg_errno)
161 		{
162 		  free(buf);
163 		  if (reg_errno == 50)
164 		    blen += RX_INCREMENT;
165 		  else
166 		    {
167 		      free(pArg);
168 		      pArg = NULL;
169 		      break;
170 		    }
171 		}
172 	      else
173 		{
174 		  pArg->compiled_expression = buf;
175 		  break;
176 		}
177 	    }
178 	}
179       while (blen <= MAX_RX_LEN);
180     }
181   if (pArg && !pArg->compiled_expression)
182     {
183       free(pArg);
184       pArg = NULL;
185     }
186   return (void *)pArg;
187 #else
188   return 0;
189 #endif
190 }
191 
192 /*---------------------------------------------------------------------------
193 |   Facility      :  libnform
194 |   Function      :  static void *Copy_RegularExpression_Type(
195 |                                      const void * argp)
196 |
197 |   Description   :  Copy structure for regex type argument.
198 |
199 |   Return Values :  Pointer to argument structure or NULL on error.
200 +--------------------------------------------------------------------------*/
201 static void *
202 Copy_RegularExpression_Type(const void *argp)
203 {
204 #if (HAVE_REGEX_H_FUNCS | HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS)
205   const RegExp_Arg *ap = (const RegExp_Arg *)argp;
206   const RegExp_Arg *result = (const RegExp_Arg *)0;
207 
208   if (ap)
209     {
210       *(ap->refCount) += 1;
211       result = ap;
212     }
213   return (void *)result;
214 #else
215   return 0;
216 #endif
217 }
218 
219 /*---------------------------------------------------------------------------
220 |   Facility      :  libnform
221 |   Function      :  static void Free_RegularExpression_Type(void * argp)
222 |
223 |   Description   :  Free structure for regex type argument.
224 |
225 |   Return Values :  -
226 +--------------------------------------------------------------------------*/
227 static void
228 Free_RegularExpression_Type(void *argp)
229 {
230 #if HAVE_REGEX_H_FUNCS | HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS
231   RegExp_Arg *ap = (RegExp_Arg *)argp;
232 
233   if (ap)
234     {
235       if (--(*(ap->refCount)) == 0)
236 	{
237 #if HAVE_REGEX_H_FUNCS
238 	  if (ap->pRegExp)
239 	    {
240 	      free(ap->refCount);
241 	      regfree(ap->pRegExp);
242 	    }
243 #elif HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS
244 	  if (ap->compiled_expression)
245 	    {
246 	      free(ap->refCount);
247 	      free(ap->compiled_expression);
248 	    }
249 #endif
250 	  free(ap);
251 	}
252     }
253 #endif
254 }
255 
256 /*---------------------------------------------------------------------------
257 |   Facility      :  libnform
258 |   Function      :  static bool Check_RegularExpression_Field(
259 |                                      FIELD * field,
260 |                                      const void  * argp)
261 |
262 |   Description   :  Validate buffer content to be a valid regular expression
263 |
264 |   Return Values :  TRUE  - field is valid
265 |                    FALSE - field is invalid
266 +--------------------------------------------------------------------------*/
267 static bool
268 Check_RegularExpression_Field(FIELD *field, const void *argp)
269 {
270   bool match = FALSE;
271 
272 #if HAVE_REGEX_H_FUNCS
273   const RegExp_Arg *ap = (const RegExp_Arg *)argp;
274 
275   if (ap && ap->pRegExp)
276     match = (regexec(ap->pRegExp, field_buffer(field, 0), 0, NULL, 0)
277 	     ? FALSE
278 	     : TRUE);
279 #elif HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS
280   RegExp_Arg *ap = (RegExp_Arg *)argp;
281 
282   if (ap && ap->compiled_expression)
283     match = (step(field_buffer(field, 0), ap->compiled_expression)
284 	     ? TRUE
285 	     : FALSE);
286 #endif
287   return match;
288 }
289 
290 static FIELDTYPE typeREGEXP =
291 {
292   _HAS_ARGS | _RESIDENT,
293   1,				/* this is mutable, so we can't be const */
294   (FIELDTYPE *)0,
295   (FIELDTYPE *)0,
296   Make_RegularExpression_Type,
297   Copy_RegularExpression_Type,
298   Free_RegularExpression_Type,
299   Check_RegularExpression_Field,
300   NULL,
301   NULL,
302   NULL
303 };
304 
305 NCURSES_EXPORT_VAR(FIELDTYPE*) TYPE_REGEXP = &typeREGEXP;
306 
307 /* fty_regex.c ends here */
308