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+/*************************************************
+* Perl-Compatible Regular Expressions *
+*************************************************/
+
+/* PCRE is a library of functions to support regular expressions whose syntax
+and semantics are as close as possible to those of the Perl 5 language.
+
+ Written by Philip Hazel
+ Copyright (c) 1997-2008 University of Cambridge
+
+-----------------------------------------------------------------------------
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+ * Redistributions of source code must retain the above copyright notice,
+ this list of conditions and the following disclaimer.
+
+ * Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in the
+ documentation and/or other materials provided with the distribution.
+
+ * Neither the name of the University of Cambridge nor the names of its
+ contributors may be used to endorse or promote products derived from
+ this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+-----------------------------------------------------------------------------
+*/
+
+
+/* This module contains some convenience functions for extracting substrings
+from the subject string after a regex match has succeeded. The original idea
+for these functions came from Scott Wimer. */
+
+/* %ExternalCopyright% */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "pcre_internal.h"
+
+
+/*************************************************
+* Find number for named string *
+*************************************************/
+
+/* This function is used by the get_first_set() function below, as well
+as being generally available. It assumes that names are unique.
+
+Arguments:
+ code the compiled regex
+ stringname the name whose number is required
+
+Returns: the number of the named parentheses, or a negative number
+ (PCRE_ERROR_NOSUBSTRING) if not found
+*/
+
+int
+erts_pcre_get_stringnumber(const pcre *code, const char *stringname)
+{
+int rc;
+int entrysize;
+int top, bot;
+uschar *nametable;
+
+if ((rc = erts_pcre_fullinfo(code, NULL, PCRE_INFO_NAMECOUNT, &top)) != 0)
+ return rc;
+if (top <= 0) return PCRE_ERROR_NOSUBSTRING;
+
+if ((rc = erts_pcre_fullinfo(code, NULL, PCRE_INFO_NAMEENTRYSIZE, &entrysize)) != 0)
+ return rc;
+if ((rc = erts_pcre_fullinfo(code, NULL, PCRE_INFO_NAMETABLE, &nametable)) != 0)
+ return rc;
+
+bot = 0;
+while (top > bot)
+ {
+ int mid = (top + bot) / 2;
+ uschar *entry = nametable + entrysize*mid;
+ int c = strcmp(stringname, (char *)(entry + 2));
+ if (c == 0) return (entry[0] << 8) + entry[1];
+ if (c > 0) bot = mid + 1; else top = mid;
+ }
+
+return PCRE_ERROR_NOSUBSTRING;
+}
+
+
+
+/*************************************************
+* Find (multiple) entries for named string *
+*************************************************/
+
+/* This is used by the get_first_set() function below, as well as being
+generally available. It is used when duplicated names are permitted.
+
+Arguments:
+ code the compiled regex
+ stringname the name whose entries required
+ firstptr where to put the pointer to the first entry
+ lastptr where to put the pointer to the last entry
+
+Returns: the length of each entry, or a negative number
+ (PCRE_ERROR_NOSUBSTRING) if not found
+*/
+
+int
+erts_pcre_get_stringtable_entries(const pcre *code, const char *stringname,
+ char **firstptr, char **lastptr)
+{
+int rc;
+int entrysize;
+int top, bot;
+uschar *nametable, *lastentry;
+
+if ((rc = erts_pcre_fullinfo(code, NULL, PCRE_INFO_NAMECOUNT, &top)) != 0)
+ return rc;
+if (top <= 0) return PCRE_ERROR_NOSUBSTRING;
+
+if ((rc = erts_pcre_fullinfo(code, NULL, PCRE_INFO_NAMEENTRYSIZE, &entrysize)) != 0)
+ return rc;
+if ((rc = erts_pcre_fullinfo(code, NULL, PCRE_INFO_NAMETABLE, &nametable)) != 0)
+ return rc;
+
+lastentry = nametable + entrysize * (top - 1);
+bot = 0;
+while (top > bot)
+ {
+ int mid = (top + bot) / 2;
+ uschar *entry = nametable + entrysize*mid;
+ int c = strcmp(stringname, (char *)(entry + 2));
+ if (c == 0)
+ {
+ uschar *first = entry;
+ uschar *last = entry;
+ while (first > nametable)
+ {
+ if (strcmp(stringname, (char *)(first - entrysize + 2)) != 0) break;
+ first -= entrysize;
+ }
+ while (last < lastentry)
+ {
+ if (strcmp(stringname, (char *)(last + entrysize + 2)) != 0) break;
+ last += entrysize;
+ }
+ *firstptr = (char *)first;
+ *lastptr = (char *)last;
+ return entrysize;
+ }
+ if (c > 0) bot = mid + 1; else top = mid;
+ }
+
+return PCRE_ERROR_NOSUBSTRING;
+}
+
+
+
+/*************************************************
+* Find first set of multiple named strings *
+*************************************************/
+
+/* This function allows for duplicate names in the table of named substrings.
+It returns the number of the first one that was set in a pattern match.
+
+Arguments:
+ code the compiled regex
+ stringname the name of the capturing substring
+ ovector the vector of matched substrings
+
+Returns: the number of the first that is set,
+ or the number of the last one if none are set,
+ or a negative number on error
+*/
+
+static int
+get_first_set(const pcre *code, const char *stringname, int *ovector)
+{
+const real_pcre *re = (const real_pcre *)code;
+int entrysize;
+char *first, *last;
+uschar *entry;
+if ((re->options & PCRE_DUPNAMES) == 0 && (re->flags & PCRE_JCHANGED) == 0)
+ return erts_pcre_get_stringnumber(code, stringname);
+entrysize = erts_pcre_get_stringtable_entries(code, stringname, &first, &last);
+if (entrysize <= 0) return entrysize;
+for (entry = (uschar *)first; entry <= (uschar *)last; entry += entrysize)
+ {
+ int n = (entry[0] << 8) + entry[1];
+ if (ovector[n*2] >= 0) return n;
+ }
+return (first[0] << 8) + first[1];
+}
+
+
+
+
+/*************************************************
+* Copy captured string to given buffer *
+*************************************************/
+
+/* This function copies a single captured substring into a given buffer.
+Note that we use memcpy() rather than strncpy() in case there are binary zeros
+in the string.
+
+Arguments:
+ subject the subject string that was matched
+ ovector pointer to the offsets table
+ stringcount the number of substrings that were captured
+ (i.e. the yield of the pcre_exec call, unless
+ that was zero, in which case it should be 1/3
+ of the offset table size)
+ stringnumber the number of the required substring
+ buffer where to put the substring
+ size the size of the buffer
+
+Returns: if successful:
+ the length of the copied string, not including the zero
+ that is put on the end; can be zero
+ if not successful:
+ PCRE_ERROR_NOMEMORY (-6) buffer too small
+ PCRE_ERROR_NOSUBSTRING (-7) no such captured substring
+*/
+
+int
+erts_pcre_copy_substring(const char *subject, int *ovector, int stringcount,
+ int stringnumber, char *buffer, int size)
+{
+int yield;
+if (stringnumber < 0 || stringnumber >= stringcount)
+ return PCRE_ERROR_NOSUBSTRING;
+stringnumber *= 2;
+yield = ovector[stringnumber+1] - ovector[stringnumber];
+if (size < yield + 1) return PCRE_ERROR_NOMEMORY;
+memcpy(buffer, subject + ovector[stringnumber], yield);
+buffer[yield] = 0;
+return yield;
+}
+
+
+
+/*************************************************
+* Copy named captured string to given buffer *
+*************************************************/
+
+/* This function copies a single captured substring into a given buffer,
+identifying it by name. If the regex permits duplicate names, the first
+substring that is set is chosen.
+
+Arguments:
+ code the compiled regex
+ subject the subject string that was matched
+ ovector pointer to the offsets table
+ stringcount the number of substrings that were captured
+ (i.e. the yield of the pcre_exec call, unless
+ that was zero, in which case it should be 1/3
+ of the offset table size)
+ stringname the name of the required substring
+ buffer where to put the substring
+ size the size of the buffer
+
+Returns: if successful:
+ the length of the copied string, not including the zero
+ that is put on the end; can be zero
+ if not successful:
+ PCRE_ERROR_NOMEMORY (-6) buffer too small
+ PCRE_ERROR_NOSUBSTRING (-7) no such captured substring
+*/
+
+int
+erts_pcre_copy_named_substring(const pcre *code, const char *subject, int *ovector,
+ int stringcount, const char *stringname, char *buffer, int size)
+{
+int n = get_first_set(code, stringname, ovector);
+if (n <= 0) return n;
+return erts_pcre_copy_substring(subject, ovector, stringcount, n, buffer, size);
+}
+
+
+
+/*************************************************
+* Copy all captured strings to new store *
+*************************************************/
+
+/* This function gets one chunk of store and builds a list of pointers and all
+of the captured substrings in it. A NULL pointer is put on the end of the list.
+
+Arguments:
+ subject the subject string that was matched
+ ovector pointer to the offsets table
+ stringcount the number of substrings that were captured
+ (i.e. the yield of the pcre_exec call, unless
+ that was zero, in which case it should be 1/3
+ of the offset table size)
+ listptr set to point to the list of pointers
+
+Returns: if successful: 0
+ if not successful:
+ PCRE_ERROR_NOMEMORY (-6) failed to get store
+*/
+
+int
+erts_pcre_get_substring_list(const char *subject, int *ovector, int stringcount,
+ const char ***listptr)
+{
+int i;
+int size = sizeof(char *);
+int double_count = stringcount * 2;
+char **stringlist;
+char *p;
+
+for (i = 0; i < double_count; i += 2)
+ size += sizeof(char *) + ovector[i+1] - ovector[i] + 1;
+
+stringlist = (char **)(erts_pcre_malloc)(size);
+if (stringlist == NULL) return PCRE_ERROR_NOMEMORY;
+
+*listptr = (const char **)stringlist;
+p = (char *)(stringlist + stringcount + 1);
+
+for (i = 0; i < double_count; i += 2)
+ {
+ int len = ovector[i+1] - ovector[i];
+ memcpy(p, subject + ovector[i], len);
+ *stringlist++ = p;
+ p += len;
+ *p++ = 0;
+ }
+
+*stringlist = NULL;
+return 0;
+}
+
+
+
+/*************************************************
+* Free store obtained by get_substring_list *
+*************************************************/
+
+/* This function exists for the benefit of people calling PCRE from non-C
+programs that can call its functions, but not free() or (erts_pcre_free)() directly.
+
+Argument: the result of a previous erts_pcre_get_substring_list()
+Returns: nothing
+*/
+
+void
+erts_pcre_free_substring_list(const char **pointer)
+{
+(erts_pcre_free)((void *)pointer);
+}
+
+
+
+/*************************************************
+* Copy captured string to new store *
+*************************************************/
+
+/* This function copies a single captured substring into a piece of new
+store
+
+Arguments:
+ subject the subject string that was matched
+ ovector pointer to the offsets table
+ stringcount the number of substrings that were captured
+ (i.e. the yield of the pcre_exec call, unless
+ that was zero, in which case it should be 1/3
+ of the offset table size)
+ stringnumber the number of the required substring
+ stringptr where to put a pointer to the substring
+
+Returns: if successful:
+ the length of the string, not including the zero that
+ is put on the end; can be zero
+ if not successful:
+ PCRE_ERROR_NOMEMORY (-6) failed to get store
+ PCRE_ERROR_NOSUBSTRING (-7) substring not present
+*/
+
+int
+erts_pcre_get_substring(const char *subject, int *ovector, int stringcount,
+ int stringnumber, const char **stringptr)
+{
+int yield;
+char *substring;
+if (stringnumber < 0 || stringnumber >= stringcount)
+ return PCRE_ERROR_NOSUBSTRING;
+stringnumber *= 2;
+yield = ovector[stringnumber+1] - ovector[stringnumber];
+substring = (char *)(erts_pcre_malloc)(yield + 1);
+if (substring == NULL) return PCRE_ERROR_NOMEMORY;
+memcpy(substring, subject + ovector[stringnumber], yield);
+substring[yield] = 0;
+*stringptr = substring;
+return yield;
+}
+
+
+
+/*************************************************
+* Copy named captured string to new store *
+*************************************************/
+
+/* This function copies a single captured substring, identified by name, into
+new store. If the regex permits duplicate names, the first substring that is
+set is chosen.
+
+Arguments:
+ code the compiled regex
+ subject the subject string that was matched
+ ovector pointer to the offsets table
+ stringcount the number of substrings that were captured
+ (i.e. the yield of the pcre_exec call, unless
+ that was zero, in which case it should be 1/3
+ of the offset table size)
+ stringname the name of the required substring
+ stringptr where to put the pointer
+
+Returns: if successful:
+ the length of the copied string, not including the zero
+ that is put on the end; can be zero
+ if not successful:
+ PCRE_ERROR_NOMEMORY (-6) couldn't get memory
+ PCRE_ERROR_NOSUBSTRING (-7) no such captured substring
+*/
+
+int
+erts_pcre_get_named_substring(const pcre *code, const char *subject, int *ovector,
+ int stringcount, const char *stringname, const char **stringptr)
+{
+int n = get_first_set(code, stringname, ovector);
+if (n <= 0) return n;
+return erts_pcre_get_substring(subject, ovector, stringcount, n, stringptr);
+}
+
+
+
+
+/*************************************************
+* Free store obtained by get_substring *
+*************************************************/
+
+/* This function exists for the benefit of people calling PCRE from non-C
+programs that can call its functions, but not free() or (erts_pcre_free)() directly.
+
+Argument: the result of a previous erts_pcre_get_substring()
+Returns: nothing
+*/
+
+void
+erts_pcre_free_substring(const char *pointer)
+{
+(erts_pcre_free)((void *)pointer);
+}
+
+/* End of pcre_get.c */
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