get.c
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上传日期:2007-06-13
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- /*
- * ===========================================================================
- * PRODUCTION $Log: get.c,v $
- * PRODUCTION Revision 1000.0 2003/10/29 15:55:26 gouriano
- * PRODUCTION PRODUCTION: IMPORTED [ORIGINAL] Dev-tree R1.1
- * PRODUCTION
- * ===========================================================================
- */
- /*************************************************
- * Perl-Compatible Regular Expressions *
- *************************************************/
- /*
- This 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. See
- the file Tech.Notes for some information on the internals.
- Written by: Philip Hazel <ph10@cam.ac.uk>
- Copyright (c) 1997-2001 University of Cambridge
- -----------------------------------------------------------------------------
- Permission is granted to anyone to use this software for any purpose on any
- computer system, and to redistribute it freely, subject to the following
- restrictions:
- 1. This software is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
- 2. The origin of this software must not be misrepresented, either by
- explicit claim or by omission.
- 3. Altered versions must be plainly marked as such, and must not be
- misrepresented as being the original software.
- 4. If PCRE is embedded in any software that is released under the GNU
- General Purpose Licence (GPL), then the terms of that licence shall
- supersede any condition above with which it is incompatible.
- -----------------------------------------------------------------------------
- */
- /* 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 <scottw@cgibuilder.com>. */
- /* Include the internals header, which itself includes Standard C headers plus
- the external pcre header. */
- #include "pcre_internal.h"
- /*************************************************
- * 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
- 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 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
- 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 **)(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 (pcre_free)() directly.
- Argument: the result of a previous pcre_get_substring_list()
- Returns: nothing
- */
- void
- pcre_free_substring_list(const char **pointer)
- {
- (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
- 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 *)(pcre_malloc)(yield + 1);
- if (substring == NULL) return PCRE_ERROR_NOMEMORY;
- memcpy(substring, subject + ovector[stringnumber], yield);
- substring[yield] = 0;
- *stringptr = substring;
- return yield;
- }
- /*************************************************
- * 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 (pcre_free)() directly.
- Argument: the result of a previous pcre_get_substring()
- Returns: nothing
- */
- void
- pcre_free_substring(const char *pointer)
- {
- (pcre_free)((void *)pointer);
- }
- /* End of get.c */