fty_regex.c revision 166124 
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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 1.19 2006/04/22 21:33:05 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 = (RegExp_Arg *)malloc(sizeof(RegExp_Arg));
109
110  if (preg)
111    {
112      if (((preg->pRegExp = (regex_t *) malloc(sizeof(regex_t))) != 0)
113	  && !regcomp(preg->pRegExp, rx,
114		      (REG_EXTENDED | REG_NOSUB | REG_NEWLINE)))
115	{
116	  preg->refCount = (unsigned long *)malloc(sizeof(unsigned long));
117
118	  *(preg->refCount) = 1;
119	}
120      else
121	{
122	  if (preg->pRegExp)
123	    free(preg->pRegExp);
124	  free(preg);
125	  preg = (RegExp_Arg *)0;
126	}
127    }
128  return ((void *)preg);
129#elif HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS
130  char *rx = va_arg(*ap, char *);
131  RegExp_Arg *pArg;
132
133  pArg = (RegExp_Arg *)malloc(sizeof(RegExp_Arg));
134
135  if (pArg)
136    {
137      int blen = RX_INCREMENT;
138
139      pArg->compiled_expression = NULL;
140      pArg->refCount = (unsigned long *)malloc(sizeof(unsigned long));
141
142      *(pArg->refCount) = 1;
143
144      do
145	{
146	  char *buf = (char *)malloc(blen);
147
148	  if (buf)
149	    {
150#if HAVE_REGEXP_H_FUNCS
151	      char *last_pos = compile(rx, buf, &buf[blen], '\0');
152
153#else /* HAVE_REGEXPR_H_FUNCS */
154	      char *last_pos = compile(rx, buf, &buf[blen]);
155#endif
156	      if (reg_errno)
157		{
158		  free(buf);
159		  if (reg_errno == 50)
160		    blen += RX_INCREMENT;
161		  else
162		    {
163		      free(pArg);
164		      pArg = NULL;
165		      break;
166		    }
167		}
168	      else
169		{
170		  pArg->compiled_expression = buf;
171		  break;
172		}
173	    }
174	}
175      while (blen <= MAX_RX_LEN);
176    }
177  if (pArg && !pArg->compiled_expression)
178    {
179      free(pArg);
180      pArg = NULL;
181    }
182  return (void *)pArg;
183#else
184  return 0;
185#endif
186}
187
188/*---------------------------------------------------------------------------
189|   Facility      :  libnform
190|   Function      :  static void *Copy_RegularExpression_Type(
191|                                      const void * argp)
192|
193|   Description   :  Copy structure for regex type argument.
194|
195|   Return Values :  Pointer to argument structure or NULL on error.
196+--------------------------------------------------------------------------*/
197static void *
198Copy_RegularExpression_Type(const void *argp)
199{
200#if (HAVE_REGEX_H_FUNCS | HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS)
201  const RegExp_Arg *ap = (const RegExp_Arg *)argp;
202  const RegExp_Arg *result = (const RegExp_Arg *)0;
203
204  if (ap)
205    {
206      *(ap->refCount) += 1;
207      result = ap;
208    }
209  return (void *)result;
210#else
211  return 0;
212#endif
213}
214
215/*---------------------------------------------------------------------------
216|   Facility      :  libnform
217|   Function      :  static void Free_RegularExpression_Type(void * argp)
218|
219|   Description   :  Free structure for regex type argument.
220|
221|   Return Values :  -
222+--------------------------------------------------------------------------*/
223static void
224Free_RegularExpression_Type(void *argp)
225{
226#if HAVE_REGEX_H_FUNCS | HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS
227  RegExp_Arg *ap = (RegExp_Arg *)argp;
228
229  if (ap)
230    {
231      if (--(*(ap->refCount)) == 0)
232	{
233#if HAVE_REGEX_H_FUNCS
234	  if (ap->pRegExp)
235	    {
236	      free(ap->refCount);
237	      regfree(ap->pRegExp);
238	    }
239#elif HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS
240	  if (ap->compiled_expression)
241	    {
242	      free(ap->refCount);
243	      free(ap->compiled_expression);
244	    }
245#endif
246	  free(ap);
247	}
248    }
249#endif
250}
251
252/*---------------------------------------------------------------------------
253|   Facility      :  libnform
254|   Function      :  static bool Check_RegularExpression_Field(
255|                                      FIELD * field,
256|                                      const void  * argp)
257|
258|   Description   :  Validate buffer content to be a valid regular expression
259|
260|   Return Values :  TRUE  - field is valid
261|                    FALSE - field is invalid
262+--------------------------------------------------------------------------*/
263static bool
264Check_RegularExpression_Field(FIELD *field, const void *argp)
265{
266  bool match = FALSE;
267
268#if HAVE_REGEX_H_FUNCS
269  const RegExp_Arg *ap = (const RegExp_Arg *)argp;
270
271  if (ap && ap->pRegExp)
272    match = (regexec(ap->pRegExp, field_buffer(field, 0), 0, NULL, 0)
273	     ? FALSE
274	     : TRUE);
275#elif HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS
276  RegExp_Arg *ap = (RegExp_Arg *)argp;
277
278  if (ap && ap->compiled_expression)
279    match = (step(field_buffer(field, 0), ap->compiled_expression)
280	     ? TRUE
281	     : FALSE);
282#endif
283  return match;
284}
285
286static FIELDTYPE typeREGEXP =
287{
288  _HAS_ARGS | _RESIDENT,
289  1,				/* this is mutable, so we can't be const */
290  (FIELDTYPE *)0,
291  (FIELDTYPE *)0,
292  Make_RegularExpression_Type,
293  Copy_RegularExpression_Type,
294  Free_RegularExpression_Type,
295  Check_RegularExpression_Field,
296  NULL,
297  NULL,
298  NULL
299};
300
301NCURSES_EXPORT_VAR(FIELDTYPE*) TYPE_REGEXP = &typeREGEXP;
302
303/* fty_regex.c ends here */
304