[PATCH 1/2] regex: port to weird isascii platforms

[Paul Eggert]

* lib/regex_internal.h (isascii) [!_LIBC]: Supply glibc version.
---
 ChangeLog            | 5 +++++
 lib/regex_internal.h | 8 ++++++++
 2 files changed, 13 insertions(+)

diff --git a/ChangeLog b/ChangeLog
index 188bb8f2f..d15f158ab 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2020-09-23  Paul Eggert  <eggert@cs.ucla.edu>
+
+       regex: port to weird isascii platforms
+       * lib/regex_internal.h (isascii) [!_LIBC]: Supply glibc version.
+
 2020-09-20  Norihiro Tanaka  <noritnk@kcn.ne.jp>
 
        dfa: make dfasupported a global function
diff --git a/lib/regex_internal.h b/lib/regex_internal.h
index dbc503cd5..4a3cf779b 100644
--- a/lib/regex_internal.h
+++ b/lib/regex_internal.h
@@ -77,6 +77,14 @@
 # define isblank(ch) ((ch) == ' ' || (ch) == '\t')
 #endif
 
+/* regex code assumes isascii has its usual numeric meaning,
+   even if the portable character set uses EBCDIC encoding,
+   and even if wint_t is wider than int.  */
+#ifndef _LIBC
+# undef isascii
+# define isascii(c) (((c) & ~0x7f) == 0)
+#endif
+
 #ifdef _LIBC
 # ifndef _RE_DEFINE_LOCALE_FUNCTIONS
 #  define _RE_DEFINE_LOCALE_FUNCTIONS 1
-- 
2.25.4