/[pcre]/code/tags/pcre-2.01/study.c
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code/trunk/study.c revision 23 by nigel, Sat Feb 24 21:38:41 2007 UTC code/tags/pcre-2.01/study.c revision 26 by nigel, Sat Feb 24 21:38:47 2007 UTC
# Line 47  Arguments: Line 47  Arguments:
47    start_bits    points to the bit map    start_bits    points to the bit map
48    c             is the character    c             is the character
49    caseless      the caseless flag    caseless      the caseless flag
50      cd            the block with char table pointers
51    
52  Returns:        nothing  Returns:        nothing
53  */  */
54    
55  static void  static void
56  set_bit(uschar *start_bits, int c, BOOL caseless)  set_bit(uschar *start_bits, int c, BOOL caseless, compile_data *cd)
57  {  {
58  start_bits[c/8] |= (1 << (c&7));  start_bits[c/8] |= (1 << (c&7));
59  if (caseless && (pcre_ctypes[c] & ctype_letter) != 0)  if (caseless && (cd->ctypes[c] & ctype_letter) != 0)
60    start_bits[pcre_fcc[c]/8] |= (1 << (pcre_fcc[c]&7));    start_bits[cd->fcc[c]/8] |= (1 << (cd->fcc[c]&7));
61  }  }
62    
63    
# Line 73  Arguments: Line 74  Arguments:
74    code         points to an expression    code         points to an expression
75    start_bits   points to a 32-byte table, initialized to 0    start_bits   points to a 32-byte table, initialized to 0
76    caseless     the current state of the caseless flag    caseless     the current state of the caseless flag
77      cd           the block with char table pointers
78    
79  Returns:       TRUE if table built, FALSE otherwise  Returns:       TRUE if table built, FALSE otherwise
80  */  */
81    
82  static BOOL  static BOOL
83  set_start_bits(const uschar *code, uschar *start_bits, BOOL caseless)  set_start_bits(const uschar *code, uschar *start_bits, BOOL caseless,
84      compile_data *cd)
85  {  {
86  register int c;  register int c;
87    
# Line 96  do Line 99  do
99    
100      if ((int)*tcode >= OP_BRA || *tcode == OP_ASSERT)      if ((int)*tcode >= OP_BRA || *tcode == OP_ASSERT)
101        {        {
102        if (!set_start_bits(tcode, start_bits, caseless)) return FALSE;        if (!set_start_bits(tcode, start_bits, caseless, cd))
103            return FALSE;
104        }        }
105    
106      else switch(*tcode)      else switch(*tcode)
# Line 126  do Line 130  do
130    
131        case OP_BRAZERO:        case OP_BRAZERO:
132        case OP_BRAMINZERO:        case OP_BRAMINZERO:
133        if (!set_start_bits(++tcode, start_bits, caseless)) return FALSE;        if (!set_start_bits(++tcode, start_bits, caseless, cd))
134            return FALSE;
135        do tcode += (tcode[1] << 8) + tcode[2]; while (*tcode == OP_ALT);        do tcode += (tcode[1] << 8) + tcode[2]; while (*tcode == OP_ALT);
136        tcode += 3;        tcode += 3;
137        try_next = TRUE;        try_next = TRUE;
# Line 138  do Line 143  do
143        case OP_MINSTAR:        case OP_MINSTAR:
144        case OP_QUERY:        case OP_QUERY:
145        case OP_MINQUERY:        case OP_MINQUERY:
146        set_bit(start_bits, tcode[1], caseless);        set_bit(start_bits, tcode[1], caseless, cd);
147        tcode += 2;        tcode += 2;
148        try_next = TRUE;        try_next = TRUE;
149        break;        break;
# Line 147  do Line 152  do
152    
153        case OP_UPTO:        case OP_UPTO:
154        case OP_MINUPTO:        case OP_MINUPTO:
155        set_bit(start_bits, tcode[3], caseless);        set_bit(start_bits, tcode[3], caseless, cd);
156        tcode += 4;        tcode += 4;
157        try_next = TRUE;        try_next = TRUE;
158        break;        break;
# Line 162  do Line 167  do
167    
168        case OP_PLUS:        case OP_PLUS:
169        case OP_MINPLUS:        case OP_MINPLUS:
170        set_bit(start_bits, tcode[1], caseless);        set_bit(start_bits, tcode[1], caseless, cd);
171        break;        break;
172    
173        /* Single character type sets the bits and stops */        /* Single character type sets the bits and stops */
174    
175        case OP_NOT_DIGIT:        case OP_NOT_DIGIT:
176        for (c = 0; c < 32; c++) start_bits[c] |= ~pcre_cbits[c+cbit_digit];        for (c = 0; c < 32; c++)
177            start_bits[c] |= ~cd->cbits[c+cbit_digit];
178        break;        break;
179    
180        case OP_DIGIT:        case OP_DIGIT:
181        for (c = 0; c < 32; c++) start_bits[c] |= pcre_cbits[c+cbit_digit];        for (c = 0; c < 32; c++)
182            start_bits[c] |= cd->cbits[c+cbit_digit];
183        break;        break;
184    
185        case OP_NOT_WHITESPACE:        case OP_NOT_WHITESPACE:
186        for (c = 0; c < 32; c++) start_bits[c] |= ~pcre_cbits[c+cbit_space];        for (c = 0; c < 32; c++)
187            start_bits[c] |= ~cd->cbits[c+cbit_space];
188        break;        break;
189    
190        case OP_WHITESPACE:        case OP_WHITESPACE:
191        for (c = 0; c < 32; c++) start_bits[c] |= pcre_cbits[c+cbit_space];        for (c = 0; c < 32; c++)
192            start_bits[c] |= cd->cbits[c+cbit_space];
193        break;        break;
194    
195        case OP_NOT_WORDCHAR:        case OP_NOT_WORDCHAR:
196        for (c = 0; c < 32; c++)        for (c = 0; c < 32; c++)
197          start_bits[c] |= ~(pcre_cbits[c] | pcre_cbits[c+cbit_word]);          start_bits[c] |= ~(cd->cbits[c] | cd->cbits[c+cbit_word]);
198        break;        break;
199    
200        case OP_WORDCHAR:        case OP_WORDCHAR:
201        for (c = 0; c < 32; c++)        for (c = 0; c < 32; c++)
202          start_bits[c] |= (pcre_cbits[c] | pcre_cbits[c+cbit_word]);          start_bits[c] |= (cd->cbits[c] | cd->cbits[c+cbit_word]);
203        break;        break;
204    
205        /* One or more character type fudges the pointer and restarts, knowing        /* One or more character type fudges the pointer and restarts, knowing
# Line 221  do Line 230  do
230        switch(tcode[1])        switch(tcode[1])
231          {          {
232          case OP_NOT_DIGIT:          case OP_NOT_DIGIT:
233          for (c = 0; c < 32; c++) start_bits[c] |= ~pcre_cbits[c+cbit_digit];          for (c = 0; c < 32; c++)
234              start_bits[c] |= ~cd->cbits[c+cbit_digit];
235          break;          break;
236    
237          case OP_DIGIT:          case OP_DIGIT:
238          for (c = 0; c < 32; c++) start_bits[c] |= pcre_cbits[c+cbit_digit];          for (c = 0; c < 32; c++)
239              start_bits[c] |= cd->cbits[c+cbit_digit];
240          break;          break;
241    
242          case OP_NOT_WHITESPACE:          case OP_NOT_WHITESPACE:
243          for (c = 0; c < 32; c++) start_bits[c] |= ~pcre_cbits[c+cbit_space];          for (c = 0; c < 32; c++)
244              start_bits[c] |= ~cd->cbits[c+cbit_space];
245          break;          break;
246    
247          case OP_WHITESPACE:          case OP_WHITESPACE:
248          for (c = 0; c < 32; c++) start_bits[c] |= pcre_cbits[c+cbit_space];          for (c = 0; c < 32; c++)
249              start_bits[c] |= cd->cbits[c+cbit_space];
250          break;          break;
251    
252          case OP_NOT_WORDCHAR:          case OP_NOT_WORDCHAR:
253          for (c = 0; c < 32; c++)          for (c = 0; c < 32; c++)
254            start_bits[c] |= ~(pcre_cbits[c] | pcre_cbits[c+cbit_word]);            start_bits[c] |= ~(cd->cbits[c] | cd->cbits[c+cbit_word]);
255          break;          break;
256    
257          case OP_WORDCHAR:          case OP_WORDCHAR:
258          for (c = 0; c < 32; c++)          for (c = 0; c < 32; c++)
259            start_bits[c] |= (pcre_cbits[c] | pcre_cbits[c+cbit_word]);            start_bits[c] |= (cd->cbits[c] | cd->cbits[c+cbit_word]);
260          break;          break;
261          }          }
262    
# Line 316  pcre_study(const pcre *external_re, int Line 329  pcre_study(const pcre *external_re, int
329  uschar start_bits[32];  uschar start_bits[32];
330  real_pcre_extra *extra;  real_pcre_extra *extra;
331  const real_pcre *re = (const real_pcre *)external_re;  const real_pcre *re = (const real_pcre *)external_re;
332    compile_data compile_block;
333    
334  *errorptr = NULL;  *errorptr = NULL;
335    
# Line 338  present. */ Line 352  present. */
352  if ((re->options & (PCRE_ANCHORED|PCRE_FIRSTSET|PCRE_STARTLINE)) != 0)  if ((re->options & (PCRE_ANCHORED|PCRE_FIRSTSET|PCRE_STARTLINE)) != 0)
353    return NULL;    return NULL;
354    
355    /* Set the character tables in the block which is passed around */
356    
357    compile_block.lcc = re->tables + lcc_offset;
358    compile_block.fcc = re->tables + fcc_offset;
359    compile_block.cbits = re->tables + cbits_offset;
360    compile_block.ctypes = re->tables + ctypes_offset;
361    
362  /* See if we can find a fixed set of initial characters for the pattern. */  /* See if we can find a fixed set of initial characters for the pattern. */
363    
364  memset(start_bits, 0, 32 * sizeof(uschar));  memset(start_bits, 0, 32 * sizeof(uschar));
365  if (!set_start_bits(re->code, start_bits, (re->options & PCRE_CASELESS) != 0))  if (!set_start_bits(re->code, start_bits, (re->options & PCRE_CASELESS) != 0,
366    return NULL;    &compile_block)) return NULL;
367    
368  /* Get an "extra" block and put the information therein. */  /* Get an "extra" block and put the information therein. */
369    
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