From: Paul Eggert <eggert@cs.ucla.edu>
Date: Mon, 27 Apr 2026 21:15:40 +0000 (-0700)
Subject: regex: SSIZE_MAX porting
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f2bbb4391ee2ee20c5a9b9104afaf747df653d37;p=thirdparty%2Fgnulib.git

regex: SSIZE_MAX porting

* lib/regex_internal.h (IDX_MAX) [_REGEX_LARGE_OFFSETS]:
Port to non-POSIX platforms where limits.h does not define SSIZE_MAX.
This is for Gawk, which does not use Gnulib limits.h.
---

diff --git a/ChangeLog b/ChangeLog
index a3a87e555e..95d69e6611 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,10 @@
 2026-04-27  Paul Eggert  <eggert@cs.ucla.edu>
 
+	regex: SSIZE_MAX porting
+	* lib/regex_internal.h (IDX_MAX) [_REGEX_LARGE_OFFSETS]:
+	Port to non-POSIX platforms where limits.h does not define SSIZE_MAX.
+	This is for Gawk, which does not use Gnulib limits.h.
+
 	idx: cleaner namespace on GNU
 	* lib/idx.h: Include <stddef.h>, <stdint.h> only if needed.
 	(idx_t, IDX_MAX): Rely on builtin macros __PTRDIFF_TYPE__,
diff --git a/lib/regex_internal.h b/lib/regex_internal.h
index 87ed00b87a..6e526a6f38 100644
--- a/lib/regex_internal.h
+++ b/lib/regex_internal.h
@@ -180,7 +180,11 @@
    reindenting a lot of regex code that formerly used 'int'.  */
 typedef regoff_t Idx;
 #ifdef _REGEX_LARGE_OFFSETS
-# define IDX_MAX SSIZE_MAX
+# ifdef SSIZE_MAX
+#  define IDX_MAX SSIZE_MAX
+# else
+#  define IDX_MAX ((Idx) ((size_t) -1 / 2))
+# endif
 #else
 # define IDX_MAX INT_MAX
 #endif