| /* Copyright (C) 1996-2014 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library 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. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #ifndef _REGEXP_H |
| #define _REGEXP_H 1 |
| |
| /* The contents of this header file was first standardized in X/Open |
| System Interface and Headers Issue 2, originally coming from SysV. |
| In issue 4, version 2, it is marked as TO BE WITDRAWN, and it has |
| been withdrawn in SUSv3. |
| |
| This code shouldn't be used in any newly written code. It is |
| included only for compatibility reasons. Use the POSIX definition |
| in <regex.h> for portable applications and a reasonable interface. */ |
| |
| #include <features.h> |
| #include <alloca.h> |
| #include <regex.h> |
| #include <stdlib.h> |
| #include <string.h> |
| |
| /* The implementation provided here emulates the needed functionality |
| by mapping to the POSIX regular expression matcher. The interface |
| for the here included function is weird (this really is a harmless |
| word). |
| |
| The user has to provide six macros before this header file can be |
| included: |
| |
| INIT Declarations vor variables which can be used by the |
| other macros. |
| |
| GETC() Return the value of the next character in the regular |
| expression pattern. Successive calls should return |
| successive characters. |
| |
| PEEKC() Return the value of the next character in the regular |
| expression pattern. Immediately successive calls to |
| PEEKC() should return the same character which should |
| also be the next character returned by GETC(). |
| |
| UNGETC(c) Cause `c' to be returned by the next call to GETC() and |
| PEEKC(). |
| |
| RETURN(ptr) Used for normal exit of the `compile' function. `ptr' |
| is a pointer to the character after the last character of |
| the compiled regular expression. |
| |
| ERROR(val) Used for abnormal return from `compile'. `val' is the |
| error number. The error codes are: |
| 11 Range endpoint too large. |
| 16 Bad number. |
| 25 \digit out of range. |
| 36 Illegal or missing delimiter. |
| 41 No remembered search string. |
| 42 \( \) imbalance. |
| 43 Too many \(. |
| 44 More tan two numbers given in \{ \}. |
| 45 } expected after \. |
| 46 First number exceeds second in \{ \}. |
| 49 [ ] imbalance. |
| 50 Regular expression overflow. |
| |
| */ |
| |
| __BEGIN_DECLS |
| |
| /* Interface variables. They contain the results of the successful |
| calls to `setp' and `advance'. */ |
| extern char *loc1; |
| extern char *loc2; |
| |
| /* The use of this variable in the `advance' function is not |
| supported. */ |
| extern char *locs; |
| |
| |
| #ifndef __DO_NOT_DEFINE_COMPILE |
| /* Get and compile the user supplied pattern up to end of line or |
| string or until EOF is seen, whatever happens first. The result is |
| placed in the buffer starting at EXPBUF and delimited by ENDBUF. |
| |
| This function cannot be defined in the libc itself since it depends |
| on the macros. */ |
| char * |
| compile (char *__restrict instring, char *__restrict expbuf, |
| const char *__restrict endbuf, int eof) |
| { |
| char *__input_buffer = NULL; |
| size_t __input_size = 0; |
| size_t __current_size = 0; |
| int __ch; |
| int __error; |
| INIT |
| |
| /* Align the expression buffer according to the needs for an object |
| of type `regex_t'. Then check for minimum size of the buffer for |
| the compiled regular expression. */ |
| regex_t *__expr_ptr; |
| # if defined __GNUC__ && __GNUC__ >= 2 |
| const size_t __req = __alignof__ (regex_t *); |
| # else |
| /* How shall we find out? We simply guess it and can change it is |
| this really proofs to be wrong. */ |
| const size_t __req = 8; |
| # endif |
| expbuf += __req; |
| expbuf -= (expbuf - ((char *) 0)) % __req; |
| if (endbuf < expbuf + sizeof (regex_t)) |
| { |
| ERROR (50); |
| } |
| __expr_ptr = (regex_t *) expbuf; |
| /* The remaining space in the buffer can be used for the compiled |
| pattern. */ |
| __expr_ptr->__REPB_PREFIX (buffer) = expbuf + sizeof (regex_t); |
| __expr_ptr->__REPB_PREFIX (allocated) |
| = endbuf - (char *) __expr_ptr->__REPB_PREFIX (buffer); |
| |
| while ((__ch = (GETC ())) != eof) |
| { |
| if (__ch == '\0' || __ch == '\n') |
| { |
| UNGETC (__ch); |
| break; |
| } |
| |
| if (__current_size + 1 >= __input_size) |
| { |
| size_t __new_size = __input_size ? 2 * __input_size : 128; |
| char *__new_room = (char *) alloca (__new_size); |
| /* See whether we can use the old buffer. */ |
| if (__new_room + __new_size == __input_buffer) |
| { |
| __input_size += __new_size; |
| __input_buffer = (char *) memcpy (__new_room, __input_buffer, |
| __current_size); |
| } |
| else if (__input_buffer + __input_size == __new_room) |
| __input_size += __new_size; |
| else |
| { |
| __input_size = __new_size; |
| __input_buffer = (char *) memcpy (__new_room, __input_buffer, |
| __current_size); |
| } |
| } |
| __input_buffer[__current_size++] = __ch; |
| } |
| if (__current_size) |
| __input_buffer[__current_size++] = '\0'; |
| else |
| __input_buffer = ""; |
| |
| /* Now compile the pattern. */ |
| __error = regcomp (__expr_ptr, __input_buffer, REG_NEWLINE); |
| if (__error != 0) |
| /* Oh well, we have to translate POSIX error codes. */ |
| switch (__error) |
| { |
| case REG_BADPAT: |
| case REG_ECOLLATE: |
| case REG_ECTYPE: |
| case REG_EESCAPE: |
| case REG_BADRPT: |
| case REG_EEND: |
| case REG_ERPAREN: |
| default: |
| /* There is no matching error code. */ |
| RETURN (36); |
| case REG_ESUBREG: |
| RETURN (25); |
| case REG_EBRACK: |
| RETURN (49); |
| case REG_EPAREN: |
| RETURN (42); |
| case REG_EBRACE: |
| RETURN (44); |
| case REG_BADBR: |
| RETURN (46); |
| case REG_ERANGE: |
| RETURN (11); |
| case REG_ESPACE: |
| case REG_ESIZE: |
| ERROR (50); |
| } |
| |
| /* Everything is ok. */ |
| RETURN ((char *) (__expr_ptr->__REPB_PREFIX (buffer) |
| + __expr_ptr->__REPB_PREFIX (used))); |
| } |
| #endif |
| |
| |
| /* Find the next match in STRING. The compiled regular expression is |
| found in the buffer starting at EXPBUF. `loc1' will return the |
| first character matched and `loc2' points to the next unmatched |
| character. */ |
| extern int step (const char *__restrict __string, |
| const char *__restrict __expbuf) __THROW; |
| |
| /* Match the beginning of STRING with the compiled regular expression |
| in EXPBUF. If the match is successful `loc2' will contain the |
| position of the first unmatched character. */ |
| extern int advance (const char *__restrict __string, |
| const char *__restrict __expbuf) __THROW; |
| |
| |
| __END_DECLS |
| |
| #endif /* regexp.h */ |