/[pcre]/code/trunk/pcre_study.c
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revision 613 by ph10, Sat Jul 2 16:59:52 2011 UTC revision 620 by ph10, Sun Jul 17 13:53:14 2011 UTC
# Line 70  Arguments: Line 70  Arguments:
70    startcode   pointer to start of the whole pattern    startcode   pointer to start of the whole pattern
71    options     the compiling options    options     the compiling options
72    had_accept  pointer to flag for (*ACCEPT) encountered    had_accept  pointer to flag for (*ACCEPT) encountered
73      int         RECURSE depth
74    
75  Returns:   the minimum length  Returns:   the minimum length
76             -1 if \C was encountered             -1 if \C was encountered
# Line 79  Returns: the minimum length Line 80  Returns: the minimum length
80    
81  static int  static int
82  find_minlength(const uschar *code, const uschar *startcode, int options,  find_minlength(const uschar *code, const uschar *startcode, int options,
83    BOOL *had_accept_ptr)    BOOL *had_accept_ptr, int recurse_depth)
84  {  {
85  int length = -1;  int length = -1;
86  BOOL utf8 = (options & PCRE_UTF8) != 0;  BOOL utf8 = (options & PCRE_UTF8) != 0;
# Line 127  for (;;) Line 128  for (;;)
128      case OP_BRAPOS:      case OP_BRAPOS:
129      case OP_SBRAPOS:      case OP_SBRAPOS:
130      case OP_ONCE:      case OP_ONCE:
131      d = find_minlength(cc, startcode, options, had_accept_ptr);      d = find_minlength(cc, startcode, options, had_accept_ptr, recurse_depth);
132      if (d < 0) return d;      if (d < 0) return d;
133      branchlength += d;      branchlength += d;
134      if (*had_accept_ptr) return branchlength;      if (*had_accept_ptr) return branchlength;
# Line 378  for (;;) Line 379  for (;;)
379          }          }
380        else        else
381          {          {
382          d = find_minlength(cs, startcode, options, had_accept_ptr);          d = find_minlength(cs, startcode, options, had_accept_ptr,
383              recurse_depth);
384          *had_accept_ptr = FALSE;          *had_accept_ptr = FALSE;
385          }          }
386        }        }
# Line 416  for (;;) Line 418  for (;;)
418    
419      branchlength += min * d;      branchlength += min * d;
420      break;      break;
421    
422        /* We can easily detect direct recursion, but not mutual recursion. This is
423        caught by a recursion depth count. */
424    
425      case OP_RECURSE:      case OP_RECURSE:
426      cs = ce = (uschar *)startcode + GET(cc, 1);      cs = ce = (uschar *)startcode + GET(cc, 1);
427      if (cs == NULL) return -2;      if (cs == NULL) return -2;
428      do ce += GET(ce, 1); while (*ce == OP_ALT);      do ce += GET(ce, 1); while (*ce == OP_ALT);
429      if (cc > cs && cc < ce)      if ((cc > cs && cc < ce) || recurse_depth > 10)
430        had_recurse = TRUE;        had_recurse = TRUE;
431      else      else
432        {        {
433        branchlength += find_minlength(cs, startcode, options, had_accept_ptr);        branchlength += find_minlength(cs, startcode, options, had_accept_ptr,
434            recurse_depth + 1);
435        *had_accept_ptr = FALSE;        *had_accept_ptr = FALSE;
436        }        }
437      cc += 1 + LINK_SIZE;      cc += 1 + LINK_SIZE;
# Line 1275  if ((re->options & PCRE_ANCHORED) == 0 & Line 1281  if ((re->options & PCRE_ANCHORED) == 0 &
1281    
1282  /* Find the minimum length of subject string. */  /* Find the minimum length of subject string. */
1283    
1284  switch(min = find_minlength(code, code, re->options, &had_accept))  switch(min = find_minlength(code, code, re->options, &had_accept, 0))
1285    {    {
1286    case -2: *errorptr = "internal error: missing capturing bracket"; break;    case -2: *errorptr = "internal error: missing capturing bracket"; break;
1287    case -3: *errorptr = "internal error: opcode not recognized"; break;    case -3: *errorptr = "internal error: opcode not recognized"; break;
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