Get rid of re_set_syntax

Instead of using a global variable for storing regex syntax, pass it
to re_compile_pattern.  This is only enabled when compiling Emacs (i.e.
‘#ifdef emacs’).

* src/regex.h (re_set_syntax): Declare only #ifndef emacs.
(re_compile_pattern): Now takes syntax argument #ifdef emacs.

* src/regex.c (re_syntax_options): Define only #ifndef emacs.
(re_compile_pattern): Use the new syntax argument #ifdef emacs.

* src/search.c (compile_pattern_1): Don’t use re_set_syntax and
instead pass syntax to re_compile_pattern directly.

1 files changed, 11 insertions, 1 deletions

diff --git a/src/regex.c b/src/regex.c
index 261d2997c32..4edc064d6b8 100644
--- a/src/regex.c
+++ b/src/regex.c
@@ -1149,6 +1149,8 @@ print_double_string (re_char *where, re_char *string1, ssize_t size1,
 
 #endif /* not DEBUG */
 
+#ifndef emacs
+
 /* Set by `re_set_syntax' to the current regexp syntax to recognize.  Can
    also be assigned to arbitrarily: each pattern buffer stores its own
    syntax, so it can be changed between regex compilations.  */
@@ -1174,6 +1176,8 @@ re_set_syntax (reg_syntax_t syntax)
 }
 WEAK_ALIAS (__re_set_syntax, re_set_syntax)
 
+#endif
+
 /* Regexp to use to replace spaces, or NULL meaning don't.  */
 static const_re_char *whitespace_regexp;
 
@@ -6271,8 +6275,14 @@ bcmp_translate (const_re_char *s1, const_re_char *s2, register ssize_t len,
 
 const char *
 re_compile_pattern (const char *pattern, size_t length,
+#ifdef emacs
+                    reg_syntax_t syntax,
+#endif
                     struct re_pattern_buffer *bufp)
 {
+#ifndef emacs
+  const reg_syntax_t syntax = re_syntax_options;
+#endif
   reg_errcode_t ret;
 
   /* GNU code is written to assume at least RE_NREGS registers will be set
@@ -6284,7 +6294,7 @@ re_compile_pattern (const char *pattern, size_t length,
      setting no_sub.  */
   bufp->no_sub = 0;
 
-  ret = regex_compile ((re_char*) pattern, length, re_syntax_options, bufp);
+  ret = regex_compile ((re_char*) pattern, length, syntax, bufp);
 
   if (!ret)
     return NULL;