fty_regex.c revision 174994 
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28
29/***************************************************************************
30*                                                                          *
31*  Author : Juergen Pfeifer                                                *
32*                                                                          *
33***************************************************************************/
34
35#include "form.priv.h"
36
37MODULE_ID("$Id: fty_regex.c,v 1.21 2007/10/13 19:33:50 tom Exp $")
38
39#if HAVE_REGEX_H_FUNCS		/* We prefer POSIX regex */
40#include <regex.h>
41
42typedef struct
43  {
44    regex_t *pRegExp;
45    unsigned long *refCount;
46  }
47RegExp_Arg;
48
49#elif HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS
50#undef RETURN
51static int reg_errno;
52
53static char *
54RegEx_Init(char *instring)
55{
56  reg_errno = 0;
57  return instring;
58}
59
60static char *
61RegEx_Error(int code)
62{
63  reg_errno = code;
64  return 0;
65}
66
67#define INIT 		register char *sp = RegEx_Init(instring);
68#define GETC()		(*sp++)
69#define PEEKC()		(*sp)
70#define UNGETC(c)	(--sp)
71#define RETURN(c)	return(c)
72#define ERROR(c)	return RegEx_Error(c)
73
74#if HAVE_REGEXP_H_FUNCS
75#include <regexp.h>
76#else
77#include <regexpr.h>
78#endif
79
80typedef struct
81{
82  char *compiled_expression;
83  unsigned long *refCount;
84}
85RegExp_Arg;
86
87/* Maximum Length we allow for a compiled regular expression */
88#define MAX_RX_LEN   (2048)
89#define RX_INCREMENT (256)
90
91#endif
92
93/*---------------------------------------------------------------------------
94|   Facility      :  libnform
95|   Function      :  static void *Make_RegularExpression_Type(va_list * ap)
96|
97|   Description   :  Allocate structure for regex type argument.
98|
99|   Return Values :  Pointer to argument structure or NULL on error
100+--------------------------------------------------------------------------*/
101static void *
102Make_RegularExpression_Type(va_list *ap)
103{
104#if HAVE_REGEX_H_FUNCS
105  char *rx = va_arg(*ap, char *);
106  RegExp_Arg *preg;
107
108  preg = typeMalloc(RegExp_Arg, 1);
109
110  if (preg)
111    {
112      T((T_CREATE("RegExp_Arg %p"), preg));
113      if (((preg->pRegExp = typeMalloc(regex_t, 1)) != 0)
114	  && !regcomp(preg->pRegExp, rx,
115		      (REG_EXTENDED | REG_NOSUB | REG_NEWLINE)))
116	{
117	  T((T_CREATE("regex_t %p"), preg->pRegExp));
118	  preg->refCount = typeMalloc(unsigned long, 1);
119
120	  *(preg->refCount) = 1;
121	}
122      else
123	{
124	  if (preg->pRegExp)
125	    free(preg->pRegExp);
126	  free(preg);
127	  preg = (RegExp_Arg *)0;
128	}
129    }
130  return ((void *)preg);
131#elif HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS
132  char *rx = va_arg(*ap, char *);
133  RegExp_Arg *pArg;
134
135  pArg = typeMalloc(RegExp_Arg, 1);
136
137  if (pArg)
138    {
139      int blen = RX_INCREMENT;
140
141      T((T_CREATE("RegExp_Arg %p"), pArg));
142      pArg->compiled_expression = NULL;
143      pArg->refCount = typeMalloc(unsigned long, 1);
144
145      *(pArg->refCount) = 1;
146
147      do
148	{
149	  char *buf = typeMalloc(char, blen);
150
151	  if (buf)
152	    {
153#if HAVE_REGEXP_H_FUNCS
154	      char *last_pos = compile(rx, buf, &buf[blen], '\0');
155
156#else /* HAVE_REGEXPR_H_FUNCS */
157	      char *last_pos = compile(rx, buf, &buf[blen]);
158#endif
159	      if (reg_errno)
160		{
161		  free(buf);
162		  if (reg_errno == 50)
163		    blen += RX_INCREMENT;
164		  else
165		    {
166		      free(pArg);
167		      pArg = NULL;
168		      break;
169		    }
170		}
171	      else
172		{
173		  pArg->compiled_expression = buf;
174		  break;
175		}
176	    }
177	}
178      while (blen <= MAX_RX_LEN);
179    }
180  if (pArg && !pArg->compiled_expression)
181    {
182      free(pArg);
183      pArg = NULL;
184    }
185  return (void *)pArg;
186#else
187  return 0;
188#endif
189}
190
191/*---------------------------------------------------------------------------
192|   Facility      :  libnform
193|   Function      :  static void *Copy_RegularExpression_Type(
194|                                      const void * argp)
195|
196|   Description   :  Copy structure for regex type argument.
197|
198|   Return Values :  Pointer to argument structure or NULL on error.
199+--------------------------------------------------------------------------*/
200static void *
201Copy_RegularExpression_Type(const void *argp)
202{
203#if (HAVE_REGEX_H_FUNCS | HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS)
204  const RegExp_Arg *ap = (const RegExp_Arg *)argp;
205  const RegExp_Arg *result = (const RegExp_Arg *)0;
206
207  if (ap)
208    {
209      *(ap->refCount) += 1;
210      result = ap;
211    }
212  return (void *)result;
213#else
214  return 0;
215#endif
216}
217
218/*---------------------------------------------------------------------------
219|   Facility      :  libnform
220|   Function      :  static void Free_RegularExpression_Type(void * argp)
221|
222|   Description   :  Free structure for regex type argument.
223|
224|   Return Values :  -
225+--------------------------------------------------------------------------*/
226static void
227Free_RegularExpression_Type(void *argp)
228{
229#if HAVE_REGEX_H_FUNCS | HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS
230  RegExp_Arg *ap = (RegExp_Arg *)argp;
231
232  if (ap)
233    {
234      if (--(*(ap->refCount)) == 0)
235	{
236#if HAVE_REGEX_H_FUNCS
237	  if (ap->pRegExp)
238	    {
239	      free(ap->refCount);
240	      regfree(ap->pRegExp);
241	    }
242#elif HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS
243	  if (ap->compiled_expression)
244	    {
245	      free(ap->refCount);
246	      free(ap->compiled_expression);
247	    }
248#endif
249	  free(ap);
250	}
251    }
252#endif
253}
254
255/*---------------------------------------------------------------------------
256|   Facility      :  libnform
257|   Function      :  static bool Check_RegularExpression_Field(
258|                                      FIELD * field,
259|                                      const void  * argp)
260|
261|   Description   :  Validate buffer content to be a valid regular expression
262|
263|   Return Values :  TRUE  - field is valid
264|                    FALSE - field is invalid
265+--------------------------------------------------------------------------*/
266static bool
267Check_RegularExpression_Field(FIELD *field, const void *argp)
268{
269  bool match = FALSE;
270
271#if HAVE_REGEX_H_FUNCS
272  const RegExp_Arg *ap = (const RegExp_Arg *)argp;
273
274  if (ap && ap->pRegExp)
275    match = (regexec(ap->pRegExp, field_buffer(field, 0), 0, NULL, 0)
276	     ? FALSE
277	     : TRUE);
278#elif HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS
279  RegExp_Arg *ap = (RegExp_Arg *)argp;
280
281  if (ap && ap->compiled_expression)
282    match = (step(field_buffer(field, 0), ap->compiled_expression)
283	     ? TRUE
284	     : FALSE);
285#endif
286  return match;
287}
288
289static FIELDTYPE typeREGEXP =
290{
291  _HAS_ARGS | _RESIDENT,
292  1,				/* this is mutable, so we can't be const */
293  (FIELDTYPE *)0,
294  (FIELDTYPE *)0,
295  Make_RegularExpression_Type,
296  Copy_RegularExpression_Type,
297  Free_RegularExpression_Type,
298  Check_RegularExpression_Field,
299  NULL,
300  NULL,
301  NULL
302};
303
304NCURSES_EXPORT_VAR(FIELDTYPE*) TYPE_REGEXP = &typeREGEXP;
305
306/* fty_regex.c ends here */
307