Imported Upstream version 0.9.6+really0.9.6upstream/0.9.6+really0.9.6

1 files changed, 166 insertions, 49 deletions

diff --git a/lib/string.in.h b/lib/string.in.h
index 75deca01..9a630b16 100644
--- a/lib/string.in.h
+++ b/lib/string.in.h
@@ -1,6 +1,6 @@
 /* A GNU-like <string.h>.
 
-   Copyright (C) 1995-1996, 2001-2010 Free Software Foundation, Inc.
+   Copyright (C) 1995-1996, 2001-2015 Free Software Foundation, Inc.
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as published by
@@ -13,20 +13,36 @@
    GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
-   along with this program; if not, write to the Free Software Foundation,
-   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
-
-#ifndef _GL_STRING_H
+   along with this program; if not, see <http://www.gnu.org/licenses/>.  */
 
 #if __GNUC__ >= 3
 @PRAGMA_SYSTEM_HEADER@
 #endif
+@PRAGMA_COLUMNS@
+
+#if defined _GL_ALREADY_INCLUDING_STRING_H
+/* Special invocation convention:
+   - On OS X/NetBSD we have a sequence of nested includes
+       <string.h> -> <strings.h> -> "string.h"
+     In this situation system _chk variants due to -D_FORTIFY_SOURCE
+     might be used after any replacements defined here.  */
+
+#@INCLUDE_NEXT@ @NEXT_STRING_H@
+
+#else
+/* Normal invocation convention.  */
+
+#ifndef _@GUARD_PREFIX@_STRING_H
+
+#define _GL_ALREADY_INCLUDING_STRING_H
 
 /* The include_next requires a split double-inclusion guard.  */
 #@INCLUDE_NEXT@ @NEXT_STRING_H@
 
-#ifndef _GL_STRING_H
-#define _GL_STRING_H
+#undef _GL_ALREADY_INCLUDING_STRING_H
+
+#ifndef _@GUARD_PREFIX@_STRING_H
+#define _@GUARD_PREFIX@_STRING_H
 
 /* NetBSD 5.0 mis-defines NULL.  */
 #include <stddef.h>
@@ -36,17 +52,20 @@
 # include <wchar.h>
 #endif
 
-#ifndef __attribute__
-/* This feature is available in gcc versions 2.5 and later.  */
-# if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 5)
-#  define __attribute__(Spec) /* empty */
-# endif
-/* The attribute __pure__ was added in gcc 2.96.  */
-# if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 96)
-#  define __pure__ /* empty */
-# endif
+/* The __attribute__ feature is available in gcc versions 2.5 and later.
+   The attribute __pure__ was added in gcc 2.96.  */
+#if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 96)
+# define _GL_ATTRIBUTE_PURE __attribute__ ((__pure__))
+#else
+# define _GL_ATTRIBUTE_PURE /* empty */
 #endif
 
+/* NetBSD 5.0 declares strsignal in <unistd.h>, not in <string.h>.  */
+/* But in any case avoid namespace pollution on glibc systems.  */
+#if (@GNULIB_STRSIGNAL@ || defined GNULIB_POSIXCHECK) && defined __NetBSD__ \
+    && ! defined __GLIBC__
+# include <unistd.h>
+#endif
 
 /* The definitions of _GL_FUNCDECL_RPL etc. are copied here.  */
 
@@ -55,6 +74,36 @@
 /* The definition of _GL_WARN_ON_USE is copied here.  */
 
 
+/* Find the index of the least-significant set bit.  */
+#if @GNULIB_FFSL@
+# if !@HAVE_FFSL@
+_GL_FUNCDECL_SYS (ffsl, int, (long int i));
+# endif
+_GL_CXXALIAS_SYS (ffsl, int, (long int i));
+_GL_CXXALIASWARN (ffsl);
+#elif defined GNULIB_POSIXCHECK
+# undef ffsl
+# if HAVE_RAW_DECL_FFSL
+_GL_WARN_ON_USE (ffsl, "ffsl is not portable - use the ffsl module");
+# endif
+#endif
+
+
+/* Find the index of the least-significant set bit.  */
+#if @GNULIB_FFSLL@
+# if !@HAVE_FFSLL@
+_GL_FUNCDECL_SYS (ffsll, int, (long long int i));
+# endif
+_GL_CXXALIAS_SYS (ffsll, int, (long long int i));
+_GL_CXXALIASWARN (ffsll);
+#elif defined GNULIB_POSIXCHECK
+# undef ffsll
+# if HAVE_RAW_DECL_FFSLL
+_GL_WARN_ON_USE (ffsll, "ffsll is not portable - use the ffsll module");
+# endif
+#endif
+
+
 /* Return the first instance of C within N bytes of S, or NULL.  */
 #if @GNULIB_MEMCHR@
 # if @REPLACE_MEMCHR@
@@ -62,13 +111,13 @@
 #   define memchr rpl_memchr
 #  endif
 _GL_FUNCDECL_RPL (memchr, void *, (void const *__s, int __c, size_t __n)
-                                  __attribute__ ((__pure__))
+                                  _GL_ATTRIBUTE_PURE
                                   _GL_ARG_NONNULL ((1)));
 _GL_CXXALIAS_RPL (memchr, void *, (void const *__s, int __c, size_t __n));
 # else
 #  if ! @HAVE_MEMCHR@
 _GL_FUNCDECL_SYS (memchr, void *, (void const *__s, int __c, size_t __n)
-                                  __attribute__ ((__pure__))
+                                  _GL_ATTRIBUTE_PURE
                                   _GL_ARG_NONNULL ((1)));
 #  endif
   /* On some systems, this function is defined as an overloaded function:
@@ -78,7 +127,7 @@ _GL_CXXALIAS_SYS_CAST2 (memchr,
                         void *, (void const *__s, int __c, size_t __n),
                         void const *, (void const *__s, int __c, size_t __n));
 # endif
-# if __GLIBC__ == 2 && __GLIBC_MINOR__ >= 10 \
+# if ((__GLIBC__ == 2 && __GLIBC_MINOR__ >= 10) && !defined __UCLIBC__) \
      && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 4))
 _GL_CXXALIASWARN1 (memchr, void *, (void *__s, int __c, size_t __n));
 _GL_CXXALIASWARN1 (memchr, void const *,
@@ -102,7 +151,8 @@ _GL_WARN_ON_USE (memchr, "memchr has platform-specific bugs - "
 _GL_FUNCDECL_RPL (memmem, void *,
                   (void const *__haystack, size_t __haystack_len,
                    void const *__needle, size_t __needle_len)
-                  __attribute__ ((__pure__)) _GL_ARG_NONNULL ((1, 3)));
+                  _GL_ATTRIBUTE_PURE
+                  _GL_ARG_NONNULL ((1, 3)));
 _GL_CXXALIAS_RPL (memmem, void *,
                   (void const *__haystack, size_t __haystack_len,
                    void const *__needle, size_t __needle_len));
@@ -111,7 +161,8 @@ _GL_CXXALIAS_RPL (memmem, void *,
 _GL_FUNCDECL_SYS (memmem, void *,
                   (void const *__haystack, size_t __haystack_len,
                    void const *__needle, size_t __needle_len)
-                  __attribute__ ((__pure__)) _GL_ARG_NONNULL ((1, 3)));
+                  _GL_ATTRIBUTE_PURE
+                  _GL_ARG_NONNULL ((1, 3)));
 #  endif
 _GL_CXXALIAS_SYS (memmem, void *,
                   (void const *__haystack, size_t __haystack_len,
@@ -152,7 +203,7 @@ _GL_WARN_ON_USE (mempcpy, "mempcpy is unportable - "
 #if @GNULIB_MEMRCHR@
 # if ! @HAVE_DECL_MEMRCHR@
 _GL_FUNCDECL_SYS (memrchr, void *, (void const *, int, size_t)
-                                   __attribute__ ((__pure__))
+                                   _GL_ATTRIBUTE_PURE
                                    _GL_ARG_NONNULL ((1)));
 # endif
   /* On some systems, this function is defined as an overloaded function:
@@ -161,7 +212,7 @@ _GL_FUNCDECL_SYS (memrchr, void *, (void const *, int, size_t)
 _GL_CXXALIAS_SYS_CAST2 (memrchr,
                         void *, (void const *, int, size_t),
                         void const *, (void const *, int, size_t));
-# if __GLIBC__ == 2 && __GLIBC_MINOR__ >= 10 \
+# if ((__GLIBC__ == 2 && __GLIBC_MINOR__ >= 10) && !defined __UCLIBC__) \
      && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 4))
 _GL_CXXALIASWARN1 (memrchr, void *, (void *, int, size_t));
 _GL_CXXALIASWARN1 (memrchr, void const *, (void const *, int, size_t));
@@ -182,7 +233,7 @@ _GL_WARN_ON_USE (memrchr, "memrchr is unportable - "
 #if @GNULIB_RAWMEMCHR@
 # if ! @HAVE_RAWMEMCHR@
 _GL_FUNCDECL_SYS (rawmemchr, void *, (void const *__s, int __c_in)
-                                     __attribute__ ((__pure__))
+                                     _GL_ATTRIBUTE_PURE
                                      _GL_ARG_NONNULL ((1)));
 # endif
   /* On some systems, this function is defined as an overloaded function:
@@ -191,7 +242,7 @@ _GL_FUNCDECL_SYS (rawmemchr, void *, (void const *__s, int __c_in)
 _GL_CXXALIAS_SYS_CAST2 (rawmemchr,
                         void *, (void const *__s, int __c_in),
                         void const *, (void const *__s, int __c_in));
-# if __GLIBC__ == 2 && __GLIBC_MINOR__ >= 10 \
+# if ((__GLIBC__ == 2 && __GLIBC_MINOR__ >= 10) && !defined __UCLIBC__) \
      && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 4))
 _GL_CXXALIASWARN1 (rawmemchr, void *, (void *__s, int __c_in));
 _GL_CXXALIASWARN1 (rawmemchr, void const *, (void const *__s, int __c_in));
@@ -229,6 +280,7 @@ _GL_WARN_ON_USE (stpcpy, "stpcpy is unportable - "
 #if @GNULIB_STPNCPY@
 # if @REPLACE_STPNCPY@
 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
+#   undef stpncpy
 #   define stpncpy rpl_stpncpy
 #  endif
 _GL_FUNCDECL_RPL (stpncpy, char *,
@@ -270,18 +322,29 @@ _GL_WARN_ON_USE (strchr, "strchr cannot work correctly on character strings "
 
 /* Find the first occurrence of C in S or the final NUL byte.  */
 #if @GNULIB_STRCHRNUL@
-# if ! @HAVE_STRCHRNUL@
+# if @REPLACE_STRCHRNUL@
+#  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
+#   define strchrnul rpl_strchrnul
+#  endif
+_GL_FUNCDECL_RPL (strchrnul, char *, (const char *__s, int __c_in)
+                                     _GL_ATTRIBUTE_PURE
+                                     _GL_ARG_NONNULL ((1)));
+_GL_CXXALIAS_RPL (strchrnul, char *,
+                  (const char *str, int ch));
+# else
+#  if ! @HAVE_STRCHRNUL@
 _GL_FUNCDECL_SYS (strchrnul, char *, (char const *__s, int __c_in)
-                                     __attribute__ ((__pure__))
+                                     _GL_ATTRIBUTE_PURE
                                      _GL_ARG_NONNULL ((1)));
-# endif
+#  endif
   /* On some systems, this function is defined as an overloaded function:
        extern "C++" { const char * std::strchrnul (const char *, int); }
        extern "C++" { char * std::strchrnul (char *, int); }  */
 _GL_CXXALIAS_SYS_CAST2 (strchrnul,
                         char *, (char const *__s, int __c_in),
                         char const *, (char const *__s, int __c_in));
-# if __GLIBC__ == 2 && __GLIBC_MINOR__ >= 10 \
+# endif
+# if ((__GLIBC__ == 2 && __GLIBC_MINOR__ >= 10) && !defined __UCLIBC__) \
      && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 4))
 _GL_CXXALIASWARN1 (strchrnul, char *, (char *__s, int __c_in));
 _GL_CXXALIASWARN1 (strchrnul, char const *, (char const *__s, int __c_in));
@@ -306,6 +369,10 @@ _GL_WARN_ON_USE (strchrnul, "strchrnul is unportable - "
 _GL_FUNCDECL_RPL (strdup, char *, (char const *__s) _GL_ARG_NONNULL ((1)));
 _GL_CXXALIAS_RPL (strdup, char *, (char const *__s));
 # else
+#  if defined __cplusplus && defined GNULIB_NAMESPACE && defined strdup
+    /* strdup exists as a function and as a macro.  Get rid of the macro.  */
+#   undef strdup
+#  endif
 #  if !(@HAVE_DECL_STRDUP@ || defined strdup)
 _GL_FUNCDECL_SYS (strdup, char *, (char const *__s) _GL_ARG_NONNULL ((1)));
 #  endif
@@ -378,13 +445,13 @@ _GL_WARN_ON_USE (strndup, "strndup is unportable - "
 #   define strnlen rpl_strnlen
 #  endif
 _GL_FUNCDECL_RPL (strnlen, size_t, (char const *__string, size_t __maxlen)
-                                   __attribute__ ((__pure__))
+                                   _GL_ATTRIBUTE_PURE
                                    _GL_ARG_NONNULL ((1)));
 _GL_CXXALIAS_RPL (strnlen, size_t, (char const *__string, size_t __maxlen));
 # else
 #  if ! @HAVE_DECL_STRNLEN@
 _GL_FUNCDECL_SYS (strnlen, size_t, (char const *__string, size_t __maxlen)
-                                   __attribute__ ((__pure__))
+                                   _GL_ATTRIBUTE_PURE
                                    _GL_ARG_NONNULL ((1)));
 #  endif
 _GL_CXXALIAS_SYS (strnlen, size_t, (char const *__string, size_t __maxlen));
@@ -414,7 +481,7 @@ _GL_WARN_ON_USE (strcspn, "strcspn cannot work correctly on character strings "
 #if @GNULIB_STRPBRK@
 # if ! @HAVE_STRPBRK@
 _GL_FUNCDECL_SYS (strpbrk, char *, (char const *__s, char const *__accept)
-                                   __attribute__ ((__pure__))
+                                   _GL_ATTRIBUTE_PURE
                                    _GL_ARG_NONNULL ((1, 2)));
 # endif
   /* On some systems, this function is defined as an overloaded function:
@@ -423,7 +490,7 @@ _GL_FUNCDECL_SYS (strpbrk, char *, (char const *__s, char const *__accept)
 _GL_CXXALIAS_SYS_CAST2 (strpbrk,
                         char *, (char const *__s, char const *__accept),
                         const char *, (char const *__s, char const *__accept));
-# if __GLIBC__ == 2 && __GLIBC_MINOR__ >= 10 \
+# if ((__GLIBC__ == 2 && __GLIBC_MINOR__ >= 10) && !defined __UCLIBC__) \
      && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 4))
 _GL_CXXALIASWARN1 (strpbrk, char *, (char *__s, char const *__accept));
 _GL_CXXALIASWARN1 (strpbrk, char const *,
@@ -514,7 +581,7 @@ _GL_WARN_ON_USE (strsep, "strsep is unportable - "
 #   define strstr rpl_strstr
 #  endif
 _GL_FUNCDECL_RPL (strstr, char *, (const char *haystack, const char *needle)
-                                  __attribute__ ((__pure__))
+                                  _GL_ATTRIBUTE_PURE
                                   _GL_ARG_NONNULL ((1, 2)));
 _GL_CXXALIAS_RPL (strstr, char *, (const char *haystack, const char *needle));
 # else
@@ -525,7 +592,7 @@ _GL_CXXALIAS_SYS_CAST2 (strstr,
                         char *, (const char *haystack, const char *needle),
                         const char *, (const char *haystack, const char *needle));
 # endif
-# if __GLIBC__ == 2 && __GLIBC_MINOR__ >= 10 \
+# if ((__GLIBC__ == 2 && __GLIBC_MINOR__ >= 10) && !defined __UCLIBC__) \
      && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 4))
 _GL_CXXALIASWARN1 (strstr, char *, (char *haystack, const char *needle));
 _GL_CXXALIASWARN1 (strstr, const char *,
@@ -556,14 +623,16 @@ _GL_WARN_ON_USE (strstr, "strstr is quadratic on many systems, and cannot "
 #  endif
 _GL_FUNCDECL_RPL (strcasestr, char *,
                   (const char *haystack, const char *needle)
-                  __attribute__ ((__pure__)) _GL_ARG_NONNULL ((1, 2)));
+                  _GL_ATTRIBUTE_PURE
+                  _GL_ARG_NONNULL ((1, 2)));
 _GL_CXXALIAS_RPL (strcasestr, char *,
                   (const char *haystack, const char *needle));
 # else
 #  if ! @HAVE_STRCASESTR@
 _GL_FUNCDECL_SYS (strcasestr, char *,
                   (const char *haystack, const char *needle)
-                  __attribute__ ((__pure__)) _GL_ARG_NONNULL ((1, 2)));
+                  _GL_ATTRIBUTE_PURE
+                  _GL_ARG_NONNULL ((1, 2)));
 #  endif
   /* On some systems, this function is defined as an overloaded function:
        extern "C++" { const char * strcasestr (const char *, const char *); }
@@ -572,7 +641,7 @@ _GL_CXXALIAS_SYS_CAST2 (strcasestr,
                         char *, (const char *haystack, const char *needle),
                         const char *, (const char *haystack, const char *needle));
 # endif
-# if __GLIBC__ == 2 && __GLIBC_MINOR__ >= 10 \
+# if ((__GLIBC__ == 2 && __GLIBC_MINOR__ >= 10) && !defined __UCLIBC__) \
      && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 4))
 _GL_CXXALIASWARN1 (strcasestr, char *, (char *haystack, const char *needle));
 _GL_CXXALIASWARN1 (strcasestr, const char *,
@@ -671,10 +740,14 @@ _GL_WARN_ON_USE (strtok_r, "strtok_r is unportable - "
 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 #   define mbslen rpl_mbslen
 #  endif
-_GL_FUNCDECL_RPL (mbslen, size_t, (const char *string) _GL_ARG_NONNULL ((1)));
+_GL_FUNCDECL_RPL (mbslen, size_t, (const char *string)
+                                  _GL_ATTRIBUTE_PURE
+                                  _GL_ARG_NONNULL ((1)));
 _GL_CXXALIAS_RPL (mbslen, size_t, (const char *string));
 # else
-_GL_FUNCDECL_SYS (mbslen, size_t, (const char *string) _GL_ARG_NONNULL ((1)));
+_GL_FUNCDECL_SYS (mbslen, size_t, (const char *string)
+                                  _GL_ATTRIBUTE_PURE
+                                  _GL_ARG_NONNULL ((1)));
 _GL_CXXALIAS_SYS (mbslen, size_t, (const char *string));
 # endif
 _GL_CXXALIASWARN (mbslen);
@@ -684,6 +757,7 @@ _GL_CXXALIASWARN (mbslen);
 /* Return the number of multibyte characters in the character string starting
    at STRING and ending at STRING + LEN.  */
 _GL_EXTERN_C size_t mbsnlen (const char *string, size_t len)
+     _GL_ATTRIBUTE_PURE
      _GL_ARG_NONNULL ((1));
 #endif
 
@@ -697,10 +771,12 @@ _GL_EXTERN_C size_t mbsnlen (const char *string, size_t len)
 #   define mbschr rpl_mbschr /* avoid collision with HP-UX function */
 #  endif
 _GL_FUNCDECL_RPL (mbschr, char *, (const char *string, int c)
+                                  _GL_ATTRIBUTE_PURE
                                   _GL_ARG_NONNULL ((1)));
 _GL_CXXALIAS_RPL (mbschr, char *, (const char *string, int c));
 # else
 _GL_FUNCDECL_SYS (mbschr, char *, (const char *string, int c)
+                                  _GL_ATTRIBUTE_PURE
                                   _GL_ARG_NONNULL ((1)));
 _GL_CXXALIAS_SYS (mbschr, char *, (const char *string, int c));
 # endif
@@ -712,15 +788,17 @@ _GL_CXXALIASWARN (mbschr);
    and return a pointer to it.  Return NULL if C is not found in STRING.
    Unlike strrchr(), this function works correctly in multibyte locales with
    encodings such as GB18030.  */
-# if defined __hpux
+# if defined __hpux || defined __INTERIX
 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
-#   define mbsrchr rpl_mbsrchr /* avoid collision with HP-UX function */
+#   define mbsrchr rpl_mbsrchr /* avoid collision with system function */
 #  endif
 _GL_FUNCDECL_RPL (mbsrchr, char *, (const char *string, int c)
+                                   _GL_ATTRIBUTE_PURE
                                    _GL_ARG_NONNULL ((1)));
 _GL_CXXALIAS_RPL (mbsrchr, char *, (const char *string, int c));
 # else
 _GL_FUNCDECL_SYS (mbsrchr, char *, (const char *string, int c)
+                                   _GL_ATTRIBUTE_PURE
                                    _GL_ARG_NONNULL ((1)));
 _GL_CXXALIAS_SYS (mbsrchr, char *, (const char *string, int c));
 # endif
@@ -733,6 +811,7 @@ _GL_CXXALIASWARN (mbsrchr);
    Unlike strstr(), this function works correctly in multibyte locales with
    encodings different from UTF-8.  */
 _GL_EXTERN_C char * mbsstr (const char *haystack, const char *needle)
+     _GL_ATTRIBUTE_PURE
      _GL_ARG_NONNULL ((1, 2));
 #endif
 
@@ -744,6 +823,7 @@ _GL_EXTERN_C char * mbsstr (const char *haystack, const char *needle)
    different lengths!
    Unlike strcasecmp(), this function works correctly in multibyte locales.  */
 _GL_EXTERN_C int mbscasecmp (const char *s1, const char *s2)
+     _GL_ATTRIBUTE_PURE
      _GL_ARG_NONNULL ((1, 2));
 #endif
 
@@ -758,20 +838,21 @@ _GL_EXTERN_C int mbscasecmp (const char *s1, const char *s2)
    Unlike strncasecmp(), this function works correctly in multibyte locales.
    But beware that N is not a byte count but a character count!  */
 _GL_EXTERN_C int mbsncasecmp (const char *s1, const char *s2, size_t n)
+     _GL_ATTRIBUTE_PURE
      _GL_ARG_NONNULL ((1, 2));
 #endif
 
 #if @GNULIB_MBSPCASECMP@
 /* Compare the initial segment of the character string STRING consisting of
    at most mbslen (PREFIX) characters with the character string PREFIX,
-   ignoring case, returning less than, equal to or greater than zero if this
-   initial segment is lexicographically less than, equal to or greater than
-   PREFIX.
-   Note: This function may, in multibyte locales, return 0 if STRING is of
-   smaller length than PREFIX!
+   ignoring case.  If the two match, return a pointer to the first byte
+   after this prefix in STRING.  Otherwise, return NULL.
+   Note: This function may, in multibyte locales, return non-NULL if STRING
+   is of smaller length than PREFIX!
    Unlike strncasecmp(), this function works correctly in multibyte
    locales.  */
 _GL_EXTERN_C char * mbspcasecmp (const char *string, const char *prefix)
+     _GL_ATTRIBUTE_PURE
      _GL_ARG_NONNULL ((1, 2));
 #endif
 
@@ -782,6 +863,7 @@ _GL_EXTERN_C char * mbspcasecmp (const char *string, const char *prefix)
    strlen (haystack) < strlen (needle) !
    Unlike strcasestr(), this function works correctly in multibyte locales.  */
 _GL_EXTERN_C char * mbscasestr (const char *haystack, const char *needle)
+     _GL_ATTRIBUTE_PURE
      _GL_ARG_NONNULL ((1, 2));
 #endif
 
@@ -792,6 +874,7 @@ _GL_EXTERN_C char * mbscasestr (const char *haystack, const char *needle)
    if none exists.
    Unlike strcspn(), this function works correctly in multibyte locales.  */
 _GL_EXTERN_C size_t mbscspn (const char *string, const char *accept)
+     _GL_ATTRIBUTE_PURE
      _GL_ARG_NONNULL ((1, 2));
 #endif
 
@@ -805,10 +888,12 @@ _GL_EXTERN_C size_t mbscspn (const char *string, const char *accept)
 #   define mbspbrk rpl_mbspbrk /* avoid collision with HP-UX function */
 #  endif
 _GL_FUNCDECL_RPL (mbspbrk, char *, (const char *string, const char *accept)
+                                   _GL_ATTRIBUTE_PURE
                                    _GL_ARG_NONNULL ((1, 2)));
 _GL_CXXALIAS_RPL (mbspbrk, char *, (const char *string, const char *accept));
 # else
 _GL_FUNCDECL_SYS (mbspbrk, char *, (const char *string, const char *accept)
+                                   _GL_ATTRIBUTE_PURE
                                    _GL_ARG_NONNULL ((1, 2)));
 _GL_CXXALIAS_SYS (mbspbrk, char *, (const char *string, const char *accept));
 # endif
@@ -822,6 +907,7 @@ _GL_CXXALIASWARN (mbspbrk);
    if none exists.
    Unlike strspn(), this function works correctly in multibyte locales.  */
 _GL_EXTERN_C size_t mbsspn (const char *string, const char *reject)
+     _GL_ATTRIBUTE_PURE
      _GL_ARG_NONNULL ((1, 2));
 #endif
 
@@ -885,6 +971,35 @@ _GL_WARN_ON_USE (strerror, "strerror is unportable - "
                  "use gnulib module strerror to guarantee non-NULL result");
 #endif
 
+/* Map any int, typically from errno, into an error message.  Multithread-safe.
+   Uses the POSIX declaration, not the glibc declaration.  */
+#if @GNULIB_STRERROR_R@
+# if @REPLACE_STRERROR_R@
+#  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
+#   undef strerror_r
+#   define strerror_r rpl_strerror_r
+#  endif
+_GL_FUNCDECL_RPL (strerror_r, int, (int errnum, char *buf, size_t buflen)
+                                   _GL_ARG_NONNULL ((2)));
+_GL_CXXALIAS_RPL (strerror_r, int, (int errnum, char *buf, size_t buflen));
+# else
+#  if !@HAVE_DECL_STRERROR_R@
+_GL_FUNCDECL_SYS (strerror_r, int, (int errnum, char *buf, size_t buflen)
+                                   _GL_ARG_NONNULL ((2)));
+#  endif
+_GL_CXXALIAS_SYS (strerror_r, int, (int errnum, char *buf, size_t buflen));
+# endif
+# if @HAVE_DECL_STRERROR_R@
+_GL_CXXALIASWARN (strerror_r);
+# endif
+#elif defined GNULIB_POSIXCHECK
+# undef strerror_r
+# if HAVE_RAW_DECL_STRERROR_R
+_GL_WARN_ON_USE (strerror_r, "strerror_r is unportable - "
+                 "use gnulib module strerror_r-posix for portability");
+# endif
+#endif
+
 #if @GNULIB_STRSIGNAL@
 # if @REPLACE_STRSIGNAL@
 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
@@ -912,6 +1027,7 @@ _GL_WARN_ON_USE (strsignal, "strsignal is unportable - "
 #if @GNULIB_STRVERSCMP@
 # if !@HAVE_STRVERSCMP@
 _GL_FUNCDECL_SYS (strverscmp, int, (const char *, const char *)
+                                   _GL_ATTRIBUTE_PURE
                                    _GL_ARG_NONNULL ((1, 2)));
 # endif
 _GL_CXXALIAS_SYS (strverscmp, int, (const char *, const char *));
@@ -925,5 +1041,6 @@ _GL_WARN_ON_USE (strverscmp, "strverscmp is unportable - "
 #endif
 
 
-#endif /* _GL_STRING_H */
-#endif /* _GL_STRING_H */
+#endif /* _@GUARD_PREFIX@_STRING_H */
+#endif /* _@GUARD_PREFIX@_STRING_H */
+#endif