Import latest regex module from gnulib.

1 files changed, 194 insertions, 299 deletions

diff --git a/lib/regex.h b/lib/regex.h
index 22384df1f..b1ae24906 100644
--- a/lib/regex.h
+++ b/lib/regex.h
@@ -28,16 +28,16 @@
 extern "C" {
 #endif
 
-/* Define _REGEX_SOURCE to get definitions that are incompatible with
-   POSIX.  */
-#if (!defined _REGEX_SOURCE					\
-     && (defined _GNU_SOURCE					\
-	 || (!defined _POSIX_C_SOURCE && !defined _POSIX_SOURCE	\
-	     && !defined _XOPEN_SOURCE)))
-# define _REGEX_SOURCE 1
+/* Define __USE_GNU_REGEX to declare GNU extensions that violate the
+   POSIX name space rules.  */
+#undef __USE_GNU_REGEX
+#if (defined _GNU_SOURCE					\
+     || (!defined _POSIX_C_SOURCE && !defined _POSIX_SOURCE	\
+	 && !defined _XOPEN_SOURCE))
+# define __USE_GNU_REGEX 1
 #endif
 
-#if defined _REGEX_SOURCE && defined VMS
+#ifdef __VMS
 /* VMS doesn't have `size_t' in <sys/types.h>, even though POSIX says it
    should be there.  */
 # include <stddef.h>
@@ -58,8 +58,8 @@ extern "C" {
    signalled its intention to change the requirement to be that
    regoff_t be at least as wide as ptrdiff_t and ssize_t; see XBD ERN
    60 (2005-08-25).  We don't know of any hosts where ssize_t or
-   ptrdiff_t is wider than long int, so long int is safe.  */
-typedef long int regoff_t;
+   ptrdiff_t is wider than ssize_t, so ssize_t is safe.  */
+typedef ssize_t regoff_t;
 
 /* The type of nonnegative object indexes.  Traditionally, GNU regex
    uses 'int' for these.  Code that uses __re_idx_t should work
@@ -99,20 +99,22 @@ typedef unsigned long int active_reg_t;
    add or remove a bit, only one other definition need change.  */
 typedef unsigned long int reg_syntax_t;
 
+#ifdef __USE_GNU_REGEX
+
 /* If this bit is not set, then \ inside a bracket expression is literal.
    If set, then such a \ quotes the following character.  */
-#define REG_BACKSLASH_ESCAPE_IN_LISTS 1ul
+# define RE_BACKSLASH_ESCAPE_IN_LISTS ((unsigned long int) 1)
 
 /* If this bit is not set, then + and ? are operators, and \+ and \? are
      literals.
    If set, then \+ and \? are operators and + and ? are literals.  */
-#define REG_BK_PLUS_QM (1ul << 1)
+# define RE_BK_PLUS_QM (RE_BACKSLASH_ESCAPE_IN_LISTS << 1)
 
 /* If this bit is set, then character classes are supported.  They are:
      [:alpha:], [:upper:], [:lower:],  [:digit:], [:alnum:], [:xdigit:],
      [:space:], [:print:], [:punct:], [:graph:], and [:cntrl:].
    If not set, then character classes are not supported.  */
-#define REG_CHAR_CLASSES (1ul << 2)
+# define RE_CHAR_CLASSES (RE_BK_PLUS_QM << 1)
 
 /* If this bit is set, then ^ and $ are always anchors (outside bracket
      expressions, of course).
@@ -122,11 +124,11 @@ typedef unsigned long int reg_syntax_t;
         $  is an anchor if it is at the end of a regular expression, or
            before a close-group or an alternation operator.
 
-   This bit could be (re)combined with REG_CONTEXT_INDEP_OPS, because
+   This bit could be (re)combined with RE_CONTEXT_INDEP_OPS, because
    POSIX draft 11.2 says that * etc. in leading positions is undefined.
    We already implemented a previous draft which made those constructs
    invalid, though, so we haven't changed the code back.  */
-#define REG_CONTEXT_INDEP_ANCHORS (1ul << 3)
+# define RE_CONTEXT_INDEP_ANCHORS (RE_CHAR_CLASSES << 1)
 
 /* If this bit is set, then special characters are always special
      regardless of where they are in the pattern.
@@ -134,70 +136,71 @@ typedef unsigned long int reg_syntax_t;
      some contexts; otherwise they are ordinary.  Specifically,
      * + ? and intervals are only special when not after the beginning,
      open-group, or alternation operator.  */
-#define REG_CONTEXT_INDEP_OPS (1ul << 4)
+# define RE_CONTEXT_INDEP_OPS (RE_CONTEXT_INDEP_ANCHORS << 1)
 
 /* If this bit is set, then *, +, ?, and { cannot be first in an re or
      immediately after an alternation or begin-group operator.  */
-#define REG_CONTEXT_INVALID_OPS (1ul << 5)
+# define RE_CONTEXT_INVALID_OPS (RE_CONTEXT_INDEP_OPS << 1)
 
 /* If this bit is set, then . matches newline.
    If not set, then it doesn't.  */
-#define REG_DOT_NEWLINE (1ul << 6)
+# define RE_DOT_NEWLINE (RE_CONTEXT_INVALID_OPS << 1)
 
 /* If this bit is set, then . doesn't match NUL.
    If not set, then it does.  */
-#define REG_DOT_NOT_NULL (1ul << 7)
+# define RE_DOT_NOT_NULL (RE_DOT_NEWLINE << 1)
 
 /* If this bit is set, nonmatching lists [^...] do not match newline.
    If not set, they do.  */
-#define REG_HAT_LISTS_NOT_NEWLINE (1ul << 8)
+# define RE_HAT_LISTS_NOT_NEWLINE (RE_DOT_NOT_NULL << 1)
 
 /* If this bit is set, either \{...\} or {...} defines an
-     interval, depending on REG_NO_BK_BRACES.
+     interval, depending on RE_NO_BK_BRACES.
    If not set, \{, \}, {, and } are literals.  */
-#define REG_INTERVALS (1ul << 9)
+# define RE_INTERVALS (RE_HAT_LISTS_NOT_NEWLINE << 1)
 
 /* If this bit is set, +, ? and | aren't recognized as operators.
    If not set, they are.  */
-#define REG_LIMITED_OPS (1ul << 10)
+# define RE_LIMITED_OPS (RE_INTERVALS << 1)
 
 /* If this bit is set, newline is an alternation operator.
    If not set, newline is literal.  */
-#define REG_NEWLINE_ALT (1ul << 11)
+# define RE_NEWLINE_ALT (RE_LIMITED_OPS << 1)
 
 /* If this bit is set, then `{...}' defines an interval, and \{ and \}
      are literals.
   If not set, then `\{...\}' defines an interval.  */
-#define REG_NO_BK_BRACES (1ul << 12)
+# define RE_NO_BK_BRACES (RE_NEWLINE_ALT << 1)
 
 /* If this bit is set, (...) defines a group, and \( and \) are literals.
    If not set, \(...\) defines a group, and ( and ) are literals.  */
-#define REG_NO_BK_PARENS (1ul << 13)
+# define RE_NO_BK_PARENS (RE_NO_BK_BRACES << 1)
 
 /* If this bit is set, then \<digit> matches <digit>.
    If not set, then \<digit> is a back-reference.  */
-#define REG_NO_BK_REFS (1ul << 14)
+# define RE_NO_BK_REFS (RE_NO_BK_PARENS << 1)
 
 /* If this bit is set, then | is an alternation operator, and \| is literal.
    If not set, then \| is an alternation operator, and | is literal.  */
-#define REG_NO_BK_VBAR (1ul << 15)
+# define RE_NO_BK_VBAR (RE_NO_BK_REFS << 1)
 
 /* If this bit is set, then an ending range point collating higher
      than the starting range point, as in [z-a], is invalid.
-   If not set, the containing range is empty and does not match any string.  */
-#define REG_NO_EMPTY_RANGES (1ul << 16)
+   If not set, then when ending range point collates higher than the
+     starting range point, the range is ignored.  */
+# define RE_NO_EMPTY_RANGES (RE_NO_BK_VBAR << 1)
 
 /* If this bit is set, then an unmatched ) is ordinary.
    If not set, then an unmatched ) is invalid.  */
-#define REG_UNMATCHED_RIGHT_PAREN_ORD (1ul << 17)
+# define RE_UNMATCHED_RIGHT_PAREN_ORD (RE_NO_EMPTY_RANGES << 1)
 
 /* If this bit is set, succeed as soon as we match the whole pattern,
    without further backtracking.  */
-#define REG_NO_POSIX_BACKTRACKING (1ul << 18)
+# define RE_NO_POSIX_BACKTRACKING (RE_UNMATCHED_RIGHT_PAREN_ORD << 1)
 
 /* If this bit is set, do not process the GNU regex operators.
    If not set, then the GNU regex operators are recognized. */
-#define REG_NO_GNU_OPS (1ul << 19)
+# define RE_NO_GNU_OPS (RE_NO_POSIX_BACKTRACKING << 1)
 
 /* If this bit is set, turn on internal regex debugging.
    If not set, and debugging was on, turn it off.
@@ -205,29 +208,31 @@ typedef unsigned long int reg_syntax_t;
    We define this bit always, so that all that's needed to turn on
    debugging is to recompile regex.c; the calling code can always have
    this bit set, and it won't affect anything in the normal case. */
-#define REG_DEBUG (1ul << 20)
+# define RE_DEBUG (RE_NO_GNU_OPS << 1)
 
 /* If this bit is set, a syntactically invalid interval is treated as
    a string of ordinary characters.  For example, the ERE 'a{1' is
    treated as 'a\{1'.  */
-#define REG_INVALID_INTERVAL_ORD (1ul << 21)
+# define RE_INVALID_INTERVAL_ORD (RE_DEBUG << 1)
 
 /* If this bit is set, then ignore case when matching.
    If not set, then case is significant.  */
-#define REG_IGNORE_CASE (1ul << 22)
+# define RE_ICASE (RE_INVALID_INTERVAL_ORD << 1)
 
-/* This bit is used internally like REG_CONTEXT_INDEP_ANCHORS but only
+/* This bit is used internally like RE_CONTEXT_INDEP_ANCHORS but only
    for ^, because it is difficult to scan the regex backwards to find
    whether ^ should be special.  */
-#define REG_CARET_ANCHORS_HERE (1ul << 23)
+# define RE_CARET_ANCHORS_HERE (RE_ICASE << 1)
 
 /* If this bit is set, then \{ cannot be first in an bre or
    immediately after an alternation or begin-group operator.  */
-#define REG_CONTEXT_INVALID_DUP (1ul << 24)
+# define RE_CONTEXT_INVALID_DUP (RE_CARET_ANCHORS_HERE << 1)
 
 /* If this bit is set, then no_sub will be set to 1 during
    re_compile_pattern.  */
-#define REG_NO_SUB (1ul << 25)
+# define RE_NO_SUB (RE_CONTEXT_INVALID_DUP << 1)
+
+#endif /* defined __USE_GNU_REGEX */
 
 /* This global variable defines the particular regexp syntax to use (for
    some interfaces).  When a regexp is compiled, the syntax used is
@@ -235,82 +240,92 @@ typedef unsigned long int reg_syntax_t;
    already-compiled regexps.  */
 extern reg_syntax_t re_syntax_options;
 
+#ifdef __USE_GNU_REGEX
 /* Define combinations of the above bits for the standard possibilities.
    (The [[[ comments delimit what gets put into the Texinfo file, so
    don't delete them!)  */
 /* [[[begin syntaxes]]] */
-#define REG_SYNTAX_EMACS 0
-
-#define REG_SYNTAX_AWK							\
-  (REG_BACKSLASH_ESCAPE_IN_LISTS   | REG_DOT_NOT_NULL			\
-   | REG_NO_BK_PARENS		   | REG_NO_BK_REFS			\
-   | REG_NO_BK_VBAR		   | REG_NO_EMPTY_RANGES		\
-   | REG_DOT_NEWLINE		   | REG_CONTEXT_INDEP_ANCHORS		\
-   | REG_UNMATCHED_RIGHT_PAREN_ORD | REG_NO_GNU_OPS)
-
-#define REG_SYNTAX_GNU_AWK						\
-  ((REG_SYNTAX_POSIX_EXTENDED | REG_BACKSLASH_ESCAPE_IN_LISTS		\
-    | REG_DEBUG)							\
-   & ~(REG_DOT_NOT_NULL | REG_INTERVALS | REG_CONTEXT_INDEP_OPS		\
-       | REG_CONTEXT_INVALID_OPS ))
-
-#define REG_SYNTAX_POSIX_AWK						\
-  (REG_SYNTAX_POSIX_EXTENDED | REG_BACKSLASH_ESCAPE_IN_LISTS		\
-   | REG_INTERVALS	     | REG_NO_GNU_OPS)
-
-#define REG_SYNTAX_GREP							\
-  (REG_BK_PLUS_QM	       | REG_CHAR_CLASSES			\
-   | REG_HAT_LISTS_NOT_NEWLINE | REG_INTERVALS				\
-   | REG_NEWLINE_ALT)
-
-#define REG_SYNTAX_EGREP						\
-  (REG_CHAR_CLASSES	   | REG_CONTEXT_INDEP_ANCHORS			\
-   | REG_CONTEXT_INDEP_OPS | REG_HAT_LISTS_NOT_NEWLINE			\
-   | REG_NEWLINE_ALT	   | REG_NO_BK_PARENS				\
-   | REG_NO_BK_VBAR)
-
-#define REG_SYNTAX_POSIX_EGREP						\
-  (REG_SYNTAX_EGREP | REG_INTERVALS | REG_NO_BK_BRACES			\
-   | REG_INVALID_INTERVAL_ORD)
+# define RE_SYNTAX_EMACS 0
+
+# define RE_SYNTAX_AWK							\
+  (RE_BACKSLASH_ESCAPE_IN_LISTS   | RE_DOT_NOT_NULL			\
+   | RE_NO_BK_PARENS              | RE_NO_BK_REFS			\
+   | RE_NO_BK_VBAR                | RE_NO_EMPTY_RANGES			\
+   | RE_DOT_NEWLINE		  | RE_CONTEXT_INDEP_ANCHORS		\
+   | RE_UNMATCHED_RIGHT_PAREN_ORD | RE_NO_GNU_OPS)
+
+# define RE_SYNTAX_GNU_AWK						\
+  ((RE_SYNTAX_POSIX_EXTENDED | RE_BACKSLASH_ESCAPE_IN_LISTS | RE_DEBUG)	\
+   & ~(RE_DOT_NOT_NULL | RE_INTERVALS | RE_CONTEXT_INDEP_OPS		\
+       | RE_CONTEXT_INVALID_OPS ))
+
+# define RE_SYNTAX_POSIX_AWK						\
+  (RE_SYNTAX_POSIX_EXTENDED | RE_BACKSLASH_ESCAPE_IN_LISTS		\
+   | RE_INTERVALS	    | RE_NO_GNU_OPS)
+
+# define RE_SYNTAX_GREP							\
+  (RE_BK_PLUS_QM              | RE_CHAR_CLASSES				\
+   | RE_HAT_LISTS_NOT_NEWLINE | RE_INTERVALS				\
+   | RE_NEWLINE_ALT)
+
+# define RE_SYNTAX_EGREP						\
+  (RE_CHAR_CLASSES        | RE_CONTEXT_INDEP_ANCHORS			\
+   | RE_CONTEXT_INDEP_OPS | RE_HAT_LISTS_NOT_NEWLINE			\
+   | RE_NEWLINE_ALT       | RE_NO_BK_PARENS				\
+   | RE_NO_BK_VBAR)
+
+# define RE_SYNTAX_POSIX_EGREP						\
+  (RE_SYNTAX_EGREP | RE_INTERVALS | RE_NO_BK_BRACES			\
+   | RE_INVALID_INTERVAL_ORD)
 
 /* P1003.2/D11.2, section 4.20.7.1, lines 5078ff.  */
-#define REG_SYNTAX_ED REG_SYNTAX_POSIX_BASIC
+# define RE_SYNTAX_ED RE_SYNTAX_POSIX_BASIC
 
-#define REG_SYNTAX_SED REG_SYNTAX_POSIX_BASIC
+# define RE_SYNTAX_SED RE_SYNTAX_POSIX_BASIC
 
 /* Syntax bits common to both basic and extended POSIX regex syntax.  */
-#define _REG_SYNTAX_POSIX_COMMON					\
-  (REG_CHAR_CLASSES | REG_DOT_NEWLINE	 | REG_DOT_NOT_NULL		\
-   | REG_INTERVALS  | REG_NO_EMPTY_RANGES)
+# define _RE_SYNTAX_POSIX_COMMON					\
+  (RE_CHAR_CLASSES | RE_DOT_NEWLINE      | RE_DOT_NOT_NULL		\
+   | RE_INTERVALS  | RE_NO_EMPTY_RANGES)
 
-#define REG_SYNTAX_POSIX_BASIC						\
-  (_REG_SYNTAX_POSIX_COMMON | REG_BK_PLUS_QM | REG_CONTEXT_INVALID_DUP)
+# define RE_SYNTAX_POSIX_BASIC						\
+  (_RE_SYNTAX_POSIX_COMMON | RE_BK_PLUS_QM | RE_CONTEXT_INVALID_DUP)
 
-/* Differs from ..._POSIX_BASIC only in that REG_BK_PLUS_QM becomes
-   REG_LIMITED_OPS, i.e., \? \+ \| are not recognized.  Actually, this
+/* Differs from ..._POSIX_BASIC only in that RE_BK_PLUS_QM becomes
+   RE_LIMITED_OPS, i.e., \? \+ \| are not recognized.  Actually, this
    isn't minimal, since other operators, such as \`, aren't disabled.  */
-#define REG_SYNTAX_POSIX_MINIMAL_BASIC					\
-  (_REG_SYNTAX_POSIX_COMMON | REG_LIMITED_OPS)
-
-#define REG_SYNTAX_POSIX_EXTENDED					\
-  (_REG_SYNTAX_POSIX_COMMON  | REG_CONTEXT_INDEP_ANCHORS		\
-   | REG_CONTEXT_INDEP_OPS   | REG_NO_BK_BRACES				\
-   | REG_NO_BK_PARENS	     | REG_NO_BK_VBAR				\
-   | REG_CONTEXT_INVALID_OPS | REG_UNMATCHED_RIGHT_PAREN_ORD)
-
-/* Differs from ..._POSIX_EXTENDED in that REG_CONTEXT_INDEP_OPS is
-   removed and REG_NO_BK_REFS is added.  */
-#define REG_SYNTAX_POSIX_MINIMAL_EXTENDED				\
-  (_REG_SYNTAX_POSIX_COMMON  | REG_CONTEXT_INDEP_ANCHORS		\
-   | REG_CONTEXT_INVALID_OPS | REG_NO_BK_BRACES				\
-   | REG_NO_BK_PARENS	     | REG_NO_BK_REFS				\
-   | REG_NO_BK_VBAR	     | REG_UNMATCHED_RIGHT_PAREN_ORD)
+# define RE_SYNTAX_POSIX_MINIMAL_BASIC					\
+  (_RE_SYNTAX_POSIX_COMMON | RE_LIMITED_OPS)
+
+# define RE_SYNTAX_POSIX_EXTENDED					\
+  (_RE_SYNTAX_POSIX_COMMON  | RE_CONTEXT_INDEP_ANCHORS			\
+   | RE_CONTEXT_INDEP_OPS   | RE_NO_BK_BRACES				\
+   | RE_NO_BK_PARENS        | RE_NO_BK_VBAR				\
+   | RE_CONTEXT_INVALID_OPS | RE_UNMATCHED_RIGHT_PAREN_ORD)
+
+/* Differs from ..._POSIX_EXTENDED in that RE_CONTEXT_INDEP_OPS is
+   removed and RE_NO_BK_REFS is added.  */
+# define RE_SYNTAX_POSIX_MINIMAL_EXTENDED				\
+  (_RE_SYNTAX_POSIX_COMMON  | RE_CONTEXT_INDEP_ANCHORS			\
+   | RE_CONTEXT_INVALID_OPS | RE_NO_BK_BRACES				\
+   | RE_NO_BK_PARENS        | RE_NO_BK_REFS				\
+   | RE_NO_BK_VBAR	    | RE_UNMATCHED_RIGHT_PAREN_ORD)
 /* [[[end syntaxes]]] */
+
+#endif /* defined __USE_GNU_REGEX */
 
-/* Maximum number of duplicates an interval can allow.  This is
-   distinct from RE_DUP_MAX, to conform to POSIX name space rules and
-   to avoid collisions with <limits.h>.  */
-#define REG_DUP_MAX 32767
+#ifdef __USE_GNU_REGEX
+
+/* Maximum number of duplicates an interval can allow.  POSIX-conforming
+   systems might define this in <limits.h>, but we want our
+   value, so remove any previous define.  */
+# ifdef RE_DUP_MAX
+#  undef RE_DUP_MAX
+# endif
+/* If sizeof(int) == 2, then ((1 << 15) - 1) overflows.  */
+# define RE_DUP_MAX (0x7fff)
+
+#endif /* defined __USE_GNU_REGEX */
 
 
 /* POSIX `cflags' bits (i.e., information for `regcomp').  */
@@ -356,72 +371,55 @@ extern reg_syntax_t re_syntax_options;
 typedef enum
 {
   _REG_ENOSYS = -1,	/* This will never happen for this implementation.  */
-#define REG_ENOSYS	_REG_ENOSYS
-
-  _REG_NOERROR,		/* Success.  */
-#define REG_NOERROR	_REG_NOERROR
-
+  _REG_NOERROR = 0,	/* Success.  */
   _REG_NOMATCH,		/* Didn't find a match (for regexec).  */
-#define REG_NOMATCH	_REG_NOMATCH
 
   /* POSIX regcomp return error codes.  (In the order listed in the
      standard.)  */
-
   _REG_BADPAT,		/* Invalid pattern.  */
-#define REG_BADPAT	_REG_BADPAT
-
-  _REG_ECOLLATE,	/* Inalid collating element.  */
-#define REG_ECOLLATE	_REG_ECOLLATE
-
+  _REG_ECOLLATE,	/* Invalid collating element.  */
   _REG_ECTYPE,		/* Invalid character class name.  */
-#define REG_ECTYPE	_REG_ECTYPE
-
   _REG_EESCAPE,		/* Trailing backslash.  */
-#define REG_EESCAPE	_REG_EESCAPE
-
   _REG_ESUBREG,		/* Invalid back reference.  */
-#define REG_ESUBREG	_REG_ESUBREG
-
   _REG_EBRACK,		/* Unmatched left bracket.  */
-#define REG_EBRACK	_REG_EBRACK
-
   _REG_EPAREN,		/* Parenthesis imbalance.  */
-#define REG_EPAREN	_REG_EPAREN
-
   _REG_EBRACE,		/* Unmatched \{.  */
-#define REG_EBRACE	_REG_EBRACE
-
   _REG_BADBR,		/* Invalid contents of \{\}.  */
-#define REG_BADBR	_REG_BADBR
-
   _REG_ERANGE,		/* Invalid range end.  */
-#define REG_ERANGE	_REG_ERANGE
-
   _REG_ESPACE,		/* Ran out of memory.  */
-#define REG_ESPACE	_REG_ESPACE
-
   _REG_BADRPT,		/* No preceding re for repetition op.  */
-#define REG_BADRPT	_REG_BADRPT
 
   /* Error codes we've added.  */
-
   _REG_EEND,		/* Premature end.  */
-#define REG_EEND	_REG_EEND
-
   _REG_ESIZE,		/* Compiled pattern bigger than 2^16 bytes.  */
-#define REG_ESIZE	_REG_ESIZE
-
   _REG_ERPAREN		/* Unmatched ) or \); not returned from regcomp.  */
-#define REG_ERPAREN	_REG_ERPAREN
-
 } reg_errcode_t;
+
+#ifdef _XOPEN_SOURCE
+# define REG_ENOSYS	_REG_ENOSYS
+#endif
+#define REG_NOERROR	_REG_NOERROR
+#define REG_NOMATCH	_REG_NOMATCH
+#define REG_BADPAT	_REG_BADPAT
+#define REG_ECOLLATE	_REG_ECOLLATE
+#define REG_ECTYPE	_REG_ECTYPE
+#define REG_EESCAPE	_REG_EESCAPE
+#define REG_ESUBREG	_REG_ESUBREG
+#define REG_EBRACK	_REG_EBRACK
+#define REG_EPAREN	_REG_EPAREN
+#define REG_EBRACE	_REG_EBRACE
+#define REG_BADBR	_REG_BADBR
+#define REG_ERANGE	_REG_ERANGE
+#define REG_ESPACE	_REG_ESPACE
+#define REG_BADRPT	_REG_BADRPT
+#define REG_EEND	_REG_EEND
+#define REG_ESIZE	_REG_ESIZE
+#define REG_ERPAREN	_REG_ERPAREN
 
-/* In the traditional GNU implementation, regex.h defined member names
-   like `buffer' that POSIX does not allow.  These members now have
-   names with leading `re_' (e.g., `re_buffer').  Support the old
-   names only if _REGEX_SOURCE is defined.  New programs should use
-   the new names.  */
-#ifdef _REGEX_SOURCE
+/* struct re_pattern_buffer normally uses member names like `buffer'
+   that POSIX does not allow.  In POSIX mode these members have names
+   with leading `re_' (e.g., `re_buffer').  */
+#ifdef __USE_GNU_REGEX
 # define _REG_RE_NAME(id) id
 # define _REG_RM_NAME(id) id
 #else
@@ -430,88 +428,87 @@ typedef enum
 #endif
 
 /* The user can specify the type of the re_translate member by
-   defining the macro REG_TRANSLATE_TYPE.  In the traditional GNU
-   implementation, this macro was named RE_TRANSLATE_TYPE, but POSIX
-   does not allow this.  Support the old name only if _REGEX_SOURCE
-   and if the new name is not defined. New programs should use the new
-   name.  */
-#ifndef REG_TRANSLATE_TYPE
-# if defined _REGEX_SOURCE && defined RE_TRANSLATE_TYPE
-#  define REG_TRANSLATE_TYPE RE_TRANSLATE_TYPE
-# else
-#  define REG_TRANSLATE_TYPE char *
+   defining the macro RE_TRANSLATE_TYPE, which defaults to unsigned
+   char *.  This pollutes the POSIX name space, so in POSIX mode just
+   use unsigned char *.  */
+#ifdef __USE_GNU_REGEX
+# ifndef RE_TRANSLATE_TYPE
+#  define RE_TRANSLATE_TYPE unsigned char *
 # endif
+# define REG_TRANSLATE_TYPE RE_TRANSLATE_TYPE
+#else
+# define REG_TRANSLATE_TYPE unsigned char *
 #endif
 
 /* This data structure represents a compiled pattern.  Before calling
-   the pattern compiler), the fields `re_buffer', `re_allocated', `re_fastmap',
-   `re_translate', and `re_no_sub' can be set.  After the pattern has been
+   the pattern compiler, the fields `buffer', `allocated', `fastmap',
+   `translate', and `no_sub' can be set.  After the pattern has been
    compiled, the `re_nsub' field is available.  All other fields are
    private to the regex routines.  */
 
 struct re_pattern_buffer
 {
-/* [[[begin pattern_buffer]]] */
-	/* Space that holds the compiled pattern.  It is declared as
-          `unsigned char *' because its elements are
-           sometimes used as array indexes.  */
+  /* Space that holds the compiled pattern.  It is declared as
+     `unsigned char *' because its elements are sometimes used as
+     array indexes.  */
   unsigned char *_REG_RE_NAME (buffer);
 
-	/* Number of bytes to which `re_buffer' points.  */
+  /* Number of bytes to which `buffer' points.  */
   __re_long_size_t _REG_RE_NAME (allocated);
 
-	/* Number of bytes actually used in `re_buffer'.  */
+  /* Number of bytes actually used in `buffer'.  */
   __re_long_size_t _REG_RE_NAME (used);
 
-        /* Syntax setting with which the pattern was compiled.  */
+  /* Syntax setting with which the pattern was compiled.  */
   reg_syntax_t _REG_RE_NAME (syntax);
 
-        /* Pointer to a fastmap, if any, otherwise zero.  re_search uses
-           the fastmap, if there is one, to skip over impossible
-           starting points for matches.  */
+  /* Pointer to a fastmap, if any, otherwise zero.  re_search uses the
+     fastmap, if there is one, to skip over impossible starting points
+     for matches.  */
   char *_REG_RE_NAME (fastmap);
 
-        /* Either a translate table to apply to all characters before
-           comparing them, or zero for no translation.  The translation
-           is applied to a pattern when it is compiled and to a string
-           when it is matched.  */
+  /* Either a translate table to apply to all characters before
+     comparing them, or zero for no translation.  The translation is
+     applied to a pattern when it is compiled and to a string when it
+     is matched.  */
   REG_TRANSLATE_TYPE _REG_RE_NAME (translate);
 
-	/* Number of subexpressions found by the compiler.  */
+  /* Number of subexpressions found by the compiler.  */
   size_t re_nsub;
 
-        /* Zero if this pattern cannot match the empty string, one else.
-           Well, in truth it's used only in `re_search_2', to see
-           whether or not we should use the fastmap, so we don't set
-           this absolutely perfectly; see `re_compile_fastmap' (the
-           `duplicate' case).  */
+  /* Zero if this pattern cannot match the empty string, one else.
+     Well, in truth it's used only in `re_search_2', to see whether or
+     not we should use the fastmap, so we don't set this absolutely
+     perfectly; see `re_compile_fastmap' (the `duplicate' case).  */
   unsigned int _REG_RE_NAME (can_be_null) : 1;
 
-        /* If REG_UNALLOCATED, allocate space in the `regs' structure
-             for `max (REG_NREGS, re_nsub + 1)' groups.
-           If REG_REALLOCATE, reallocate space if necessary.
-           If REG_FIXED, use what's there.  */
-#define REG_UNALLOCATED 0
-#define REG_REALLOCATE 1
-#define REG_FIXED 2
+  /* If REGS_UNALLOCATED, allocate space in the `regs' structure
+     for `max (RE_NREGS, re_nsub + 1)' groups.
+     If REGS_REALLOCATE, reallocate space if necessary.
+     If REGS_FIXED, use what's there.  */
+#ifdef __USE_GNU_REGEX
+# define REGS_UNALLOCATED 0
+# define REGS_REALLOCATE 1
+# define REGS_FIXED 2
+#endif
   unsigned int _REG_RE_NAME (regs_allocated) : 2;
 
-        /* Set to zero when `regex_compile' compiles a pattern; set to one
-           by `re_compile_fastmap' if it updates the fastmap.  */
+  /* Set to zero when `regex_compile' compiles a pattern; set to one
+     by `re_compile_fastmap' if it updates the fastmap.  */
   unsigned int _REG_RE_NAME (fastmap_accurate) : 1;
 
-        /* If set, `re_match_2' does not return information about
-           subexpressions.  */
+  /* If set, `re_match_2' does not return information about
+     subexpressions.  */
   unsigned int _REG_RE_NAME (no_sub) : 1;
 
-        /* If set, a beginning-of-line anchor doesn't match at the
-           beginning of the string.  */
+  /* If set, a beginning-of-line anchor doesn't match at the beginning
+     of the string.  */
   unsigned int _REG_RE_NAME (not_bol) : 1;
 
-        /* Similarly for an end-of-line anchor.  */
+  /* Similarly for an end-of-line anchor.  */
   unsigned int _REG_RE_NAME (not_eol) : 1;
 
-        /* If true, an anchor at a newline matches.  */
+  /* If true, an anchor at a newline matches.  */
   unsigned int _REG_RE_NAME (newline_anchor) : 1;
 
 /* [[[end pattern_buffer]]] */
@@ -529,11 +526,11 @@ struct re_registers
 };
 
 
-/* If `regs_allocated' is REG_UNALLOCATED in the pattern buffer,
+/* If `regs_allocated' is REGS_UNALLOCATED in the pattern buffer,
    `re_match_2' returns information about at least this many registers
    the first time a `regs' structure is passed.  */
-#ifndef REG_NREGS
-# define REG_NREGS 30
+#if !defined RE_NREGS && defined __USE_GNU_REGEX
+# define RE_NREGS 30
 #endif
 
 
@@ -569,7 +566,7 @@ extern int re_compile_fastmap (struct re_pattern_buffer *__buffer);
    compiled into BUFFER.  Start searching at position START, for RANGE
    characters.  Return the starting position of the match, -1 for no
    match, or -2 for an internal error.  Also return register
-   information in REGS (if REGS and BUFFER->re_no_sub are nonzero).  */
+   information in REGS (if REGS and BUFFER->no_sub are nonzero).  */
 extern regoff_t re_search (struct re_pattern_buffer *__buffer,
 			   const char *__string, __re_idx_t __length,
 			   __re_idx_t __start, regoff_t __range,
@@ -662,110 +659,8 @@ extern size_t regerror (int __errcode, const regex_t *__restrict __preg,
 extern void regfree (regex_t *__preg);
 
 
-#ifdef _REGEX_SOURCE
-
-/* Define the POSIX-compatible member names in terms of the
-   incompatible (and deprecated) names established by _REG_RE_NAME.
-   New programs should use the re_* names.  */
-
-# define re_allocated allocated
-# define re_buffer buffer
-# define re_can_be_null can_be_null
-# define re_fastmap fastmap
-# define re_fastmap_accurate fastmap_accurate
-# define re_newline_anchor newline_anchor
-# define re_no_sub no_sub
-# define re_not_bol not_bol
-# define re_not_eol not_eol
-# define re_regs_allocated regs_allocated
-# define re_syntax syntax
-# define re_translate translate
-# define re_used used
-
-/* Similarly for _REG_RM_NAME.  */
-
-# define rm_end end
-# define rm_num_regs num_regs
-# define rm_start start
-
-/* Undef RE_DUP_MAX first, in case the user has already included a
-   <limits.h> with an incompatible definition.
-
-   On GNU systems, the most common spelling for RE_DUP_MAX's value in
-   <limits.h> is (0x7ffff), so define RE_DUP_MAX to that, not to
-   REG_DUP_MAX.  This avoid some duplicate-macro-definition warnings
-   with programs that include <limits.h> after this file.
-
-   New programs should not assume that regex.h defines RE_DUP_MAX; to
-   get the value of RE_DUP_MAX, they should instead include <limits.h>
-   and possibly invoke the sysconf function.  */
-
-# undef RE_DUP_MAX
-# define RE_DUP_MAX (0x7fff)
-
-/* Define the following symbols for backward source compatibility.
-   These symbols violate the POSIX name space rules, and new programs
-   should avoid them.  */
-
-# define REGS_FIXED REG_FIXED
-# define REGS_REALLOCATE REG_REALLOCATE
-# define REGS_UNALLOCATED REG_UNALLOCATED
-# define RE_BACKSLASH_ESCAPE_IN_LISTS REG_BACKSLASH_ESCAPE_IN_LISTS
-# define RE_BK_PLUS_QM REG_BK_PLUS_QM
-# define RE_CARET_ANCHORS_HERE REG_CARET_ANCHORS_HERE
-# define RE_CHAR_CLASSES REG_CHAR_CLASSES
-# define RE_CONTEXT_INDEP_ANCHORS REG_CONTEXT_INDEP_ANCHORS
-# define RE_CONTEXT_INDEP_OPS REG_CONTEXT_INDEP_OPS
-# define RE_CONTEXT_INVALID_DUP REG_CONTEXT_INVALID_DUP
-# define RE_CONTEXT_INVALID_OPS REG_CONTEXT_INVALID_OPS
-# define RE_DEBUG REG_DEBUG
-# define RE_DOT_NEWLINE REG_DOT_NEWLINE
-# define RE_DOT_NOT_NULL REG_DOT_NOT_NULL
-# define RE_HAT_LISTS_NOT_NEWLINE REG_HAT_LISTS_NOT_NEWLINE
-# define RE_ICASE REG_IGNORE_CASE /* avoid collision with REG_ICASE */
-# define RE_INTERVALS REG_INTERVALS
-# define RE_INVALID_INTERVAL_ORD REG_INVALID_INTERVAL_ORD
-# define RE_LIMITED_OPS REG_LIMITED_OPS
-# define RE_NEWLINE_ALT REG_NEWLINE_ALT
-# define RE_NO_BK_BRACES REG_NO_BK_BRACES
-# define RE_NO_BK_PARENS REG_NO_BK_PARENS
-# define RE_NO_BK_REFS REG_NO_BK_REFS
-# define RE_NO_BK_VBAR REG_NO_BK_VBAR
-# define RE_NO_EMPTY_RANGES REG_NO_EMPTY_RANGES
-# define RE_NO_GNU_OPS REG_NO_GNU_OPS
-# define RE_NO_POSIX_BACKTRACKING REG_NO_POSIX_BACKTRACKING
-# define RE_NO_SUB REG_NO_SUB
-# define RE_NREGS REG_NREGS
-# define RE_SYNTAX_AWK REG_SYNTAX_AWK
-# define RE_SYNTAX_ED REG_SYNTAX_ED
-# define RE_SYNTAX_EGREP REG_SYNTAX_EGREP
-# define RE_SYNTAX_EMACS REG_SYNTAX_EMACS
-# define RE_SYNTAX_GNU_AWK REG_SYNTAX_GNU_AWK
-# define RE_SYNTAX_GREP REG_SYNTAX_GREP
-# define RE_SYNTAX_POSIX_AWK REG_SYNTAX_POSIX_AWK
-# define RE_SYNTAX_POSIX_BASIC REG_SYNTAX_POSIX_BASIC
-# define RE_SYNTAX_POSIX_EGREP REG_SYNTAX_POSIX_EGREP
-# define RE_SYNTAX_POSIX_EXTENDED REG_SYNTAX_POSIX_EXTENDED
-# define RE_SYNTAX_POSIX_MINIMAL_BASIC REG_SYNTAX_POSIX_MINIMAL_BASIC
-# define RE_SYNTAX_POSIX_MINIMAL_EXTENDED REG_SYNTAX_POSIX_MINIMAL_EXTENDED
-# define RE_SYNTAX_SED REG_SYNTAX_SED
-# define RE_UNMATCHED_RIGHT_PAREN_ORD REG_UNMATCHED_RIGHT_PAREN_ORD
-# ifndef RE_TRANSLATE_TYPE
-#  define RE_TRANSLATE_TYPE REG_TRANSLATE_TYPE
-# endif
-
-#endif /* defined _REGEX_SOURCE */
-
 #ifdef __cplusplus
 }
 #endif	/* C++ */
 
 #endif /* regex.h */
-
-/*
-Local variables:
-make-backup-files: t
-version-control: t
-trim-versions-without-asking: nil
-End:
-*/