Use only US-ASCII charset when comparing stings as caseless as required by standard.

Comparisons for HTTP headers must not be affected by locale settings.

ChangeLog

@@ -1,3 +1,8 @@
+Sat Jan 16 19:14:39 CET 2016
+	Use US-ASCII only (instead of user locale settings) when
+	performing caseless string comparison as required by
+	standard. -EG
+
 Tue Jan 12 16:10:09 CET 2016
 	Fixed declaraion of MHD_get_reason_phrase_for(). -EG
 

configure.ac

@@ -86,6 +86,60 @@ MHD_LIBDEPS=""
 MHD_REQ_PRIVATE=''
 MHD_LIBDEPS_PKGCFG=''
 
+AC_CHECK_TYPE([_Bool],
+  [ AC_DEFINE([_MHD_bool],[_Bool],[Define to type which will be used as boolean type.]) ],
+  [
+    AC_CHECK_HEADER([stdbool.h], [ AC_DEFINE([HAVE_STDBOOL_H],[1],[Define to 1 if you have the <stdbool.h> header file and it's required for _MHD_bool.]) ])
+    AC_CHECK_TYPE([bool],
+      [ AC_DEFINE([_MHD_bool],[bool]) ],
+      [ AC_DEFINE([_MHD_bool],[int]) ],
+      [[
+        #ifdef HAVE_STDBOOL_H
+        #include <stdbool.h>
+        #endif
+      ]])
+  ])
+
+AC_MSG_CHECKING([[for function inline keywords suppoted by $CC]])
+save_CFLAGS="$CFLAGS"
+AX_APPEND_FLAG([[-Werror=attributes]])
+inln_prfx="none"
+# Prefer always inline functions
+for inln_prfx_chk in "inline __attribute__((always_inline))" __forceinline inline __inline__ __inline _inline _Inline; do
+  # Try to link to avoid "symbol undefined" problems at build time
+  AC_LINK_IFELSE(
+    [
+     AC_LANG_PROGRAM(
+       [[
+         #ifdef __cplusplus
+         choke me
+         #endif
+         #ifdef HAVE_STDBOOL_H
+         #include <stdbool.h>
+         #endif
+         static $inln_prfx_chk _MHD_bool cmpfn(int x, int y)
+         { return x > y; }
+         static $inln_prfx_chk int sumfn(int x, int y)
+         { return x + y; }
+       ]],[[
+       int a = 1, b = 100, c;
+       if (cmpfn(a, b))
+         c = sumfn(a, b);
+       else
+         c = 0 - sumfn(a, b);
+       ]])
+    ],
+    [[ inln_prfx="$inln_prfx_chk" ]])
+  test "x$inln_prfx" != "xnone" && break
+done
+AS_IF([[test "x$ac_cv_c_inline" != "xnone"]],
+      [
+       AC_DEFINE([INLINE_FUNC],[1],[Define to 1 if your C compiler supports inline functions.])
+       AC_DEFINE_UNQUOTED([_MHD_inline],[static $inln_prfx],[Define to prefix which will be used with MHD inline functions.])
+      ])
+AC_MSG_RESULT([[$inln_prfx]])
+CFLAGS="$save_CFLAGS"
+
 # Check system type
 AC_MSG_CHECKING([[for target host OS]])
 case "$host_os" in

src/include/platform_interface.h

@@ -34,43 +34,6 @@
 /* *****************************
      General function mapping
    *****************************/
-#if !defined(_WIN32) || defined(__CYGWIN__)
-/**
- * Check two strings case-insensitive equality
- * @param a first string to check
- * @param b second string to check
- * @return boolean true if strings are equal, boolean false if strings are unequal
- */
-#define MHD_str_equal_caseless_(a,b) (0==strcasecmp((a),(b)))
-#else
-/**
- * Check two strings case-insensitive equality
- * @param a first string to check
- * @param b second string to check
- * @return boolean true if strings are equal, boolean false if strings are unequal
- */
-#define MHD_str_equal_caseless_(a,b) (0==_stricmp((a),(b)))
-#endif
-
-#if !defined(_WIN32) || defined(__CYGWIN__)
-/**
- * Check not more than n chars in two strings case-insensitive equality
- * @param a first string to check
- * @param b second string to check
- * @param n maximum number of chars to check
- * @return boolean true if strings are equal, boolean false if strings are unequal
- */
-#define MHD_str_equal_caseless_n_(a,b,n) (0==strncasecmp((a),(b),(n)))
-#else
-/**
- * Check not more than n chars in two strings case-insensitive equality
- * @param a first string to check
- * @param b second string to check
- * @param n maximum number of chars to check
- * @return boolean true if strings are equal, boolean false if strings are unequal
- */
-#define MHD_str_equal_caseless_n_(a,b,n) (0==_strnicmp((a),(b),(n)))
-#endif
 
 /* Platform-independent snprintf name */
 #if defined(HAVE_SNPRINTF)

src/microhttpd/Makefile.am

@@ -65,6 +65,7 @@ libmicrohttpd_la_SOURCES = \
   mhd_mono_clock.c mhd_mono_clock.h \
   mhd_limits.h mhd_byteorder.h \
   sysfdsetsize.c sysfdsetsize.h \
+  mhd_str.c mhd_str.h \
   response.c response.h
 libmicrohttpd_la_CPPFLAGS = \
   $(AM_CPPFLAGS) $(MHD_LIB_CPPFLAGS) \

src/microhttpd/connection.c

@@ -30,6 +30,7 @@
 #include "memorypool.h"
 #include "response.h"
 #include "mhd_mono_clock.h"
+#include "mhd_str.h"
 
 #if HAVE_NETINET_TCP_H
 /* for TCP_CORK */

src/microhttpd/digestauth.c

@@ -27,6 +27,7 @@
 #include "internal.h"
 #include "md5.h"
 #include "mhd_mono_clock.h"
+#include "mhd_str.h"
 
 #if defined(_WIN32) && defined(MHD_W32_MUTEX_)
 #ifndef WIN32_LEAN_AND_MEAN

src/microhttpd/mhd_str.c

@@ -0,0 +1,231 @@
+/*
+  This file is part of libmicrohttpd
+  Copyright (C) 2015 Karlson2k (Evgeny Grin)
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+/**
+ * @file microhttpd/mhd_str.c
+ * @brief  Functions implementations for string manipulating
+ * @author Karlson2k (Evgeny Grin)
+ */
+
+#include "mhd_str.h"
+
+#include "MHD_config.h"
+
+#ifdef HAVE_STDBOOL_H
+#include <stdbool.h>
+#endif
+
+/*
+ * Block of functions/macros that use US-ASCII charset as required by HTTP
+ * standards. Not affected by current locale settings.
+ */
+
+#ifdef INLINE_FUNC
+ /**
+ * Check whether character is lower case letter in US-ASCII
+ * @param c character to check
+ * @return non-zero if character is lower case letter, zero otherwise
+ */
+_MHD_inline _MHD_bool
+isasciilower (char c)
+{
+  return c >= 'a' && c <= 'z';
+}
+
+/**
+ * Check whether character is upper case letter in US-ASCII
+ * @param c character to check
+ * @return non-zero if character is upper case letter, zero otherwise
+ */
+_MHD_inline _MHD_bool
+isasciiupper (char c)
+{
+  return c >= 'A' && c <= 'Z';
+}
+
+/**
+ * Check whether character is letter in US-ASCII
+ * @param c character to check
+ * @return non-zero if character is letter in US-ASCII, zero otherwise
+ */
+_MHD_inline _MHD_bool
+isasciialpha (char c)
+{
+  return isasciilower (c) || isasciiupper (c);
+}
+
+/**
+ * Check whether character is decimal digit in US-ASCII
+ * @param c character to check
+ * @return non-zero if character is decimal digit, zero otherwise
+ */
+_MHD_inline _MHD_bool
+isasciidigit (char c)
+{
+  return c >= '0' && c <= '9';
+}
+
+/**
+ * Check whether character is decimal digit or letter in US-ASCII
+ * @param c character to check
+ * @return non-zero if character is decimal digit or letter, zero otherwise
+ */
+_MHD_inline _MHD_bool
+isasciialmun (char c)
+{
+  return isasciialpha (c) || isasciidigit (c);
+}
+
+/**
+ * Convert US-ASCII character to lower case.
+ * If character is upper case letter in US-ASCII than it's converted to lower
+ * case analog. If character is NOT upper case letter than it's returned
+ * unmodified.
+ * @param c character to check
+ * @return converted to lower case character
+ */
+_MHD_inline char
+toasciilower (char c)
+{
+  return isasciiupper (c) ? (c - 'A' + 'a') : c;
+}
+
+ /**
+ * Convert US-ASCII character to upper case.
+ * If character is lower case letter in US-ASCII than it's converted to upper
+ * case analog. If character is NOT lower case letter than it's returned
+ * unmodified.
+ * @param c character to check
+ * @return converted to upper case character
+ */
+_MHD_inline char
+toasciiupper (char c)
+{
+  return isasciilower (c) ? (c - 'a' + 'A') : c;
+}
+
+#else  /* !INLINE_FUNC */
+
+/**
+ * Checks whether character is lower case letter in US-ASCII
+ * @param c character to check
+ * @return boolean true if character is lower case letter,
+ *         boolean false otherwise
+ */
+#define isasciilower(c) (((char)(c)) >= 'a' && ((char)(c)) <= 'z')
+
+/**
+ * Checks whether character is upper case letter in US-ASCII
+ * @param c character to check
+ * @return boolean true if character is upper case letter,
+ *         boolean false otherwise
+ */
+#define isasciiupper(c) (((char)(c)) >= 'A' && ((char)(c)) <= 'Z')
+
+/**
+ * Checks whether character is letter in US-ASCII
+ * @param c character to check
+ * @return boolean true if character is letter, boolean false
+ *         otherwise
+ */
+#define isasciialpha(c) (isasciilower(c) || isasciiupper(c))
+
+/**
+ * Check whether character is decimal digit in US-ASCII
+ * @param c character to check
+ * @return boolean true if character is decimal digit, boolean false
+ *         otherwise
+ */
+#define isasciidigit(c) (((char)(c)) >= '0' && ((char)(c)) <= '9')
+
+ /**
+ * Check whether character is decimal digit or letter in US-ASCII
+ * @param c character to check
+ * @return boolean true if character is decimal digit or letter,
+ *         boolean false otherwise
+ */
+#define isasciialmun(c) (isasciialpha(c) || isasciidigit(c))
+
+/**
+ * Convert US-ASCII character to lower case.
+ * If character is upper case letter in US-ASCII than it's converted to lower
+ * case analog. If character is NOT upper case letter than it's returned
+ * unmodified.
+ * @param c character to check
+ * @return converted to lower case character
+ */
+#define toasciilower(c) ((isasciiupper(c)) ? (((char)(c)) - 'A' + 'a') : ((char)(c)))
+
+/**
+ * Convert US-ASCII character to upper case.
+ * If character is lower case letter in US-ASCII than it's converted to upper
+ * case analog. If character is NOT lower case letter than it's returned
+ * unmodified.
+ * @param c character to check
+ * @return converted to upper case character
+ */
+#define toasciiupper(c) ((isasciilower(c)) ? (((char)(c)) - 'a' + 'A') : ((char)(c)))
+#endif /* !INLINE_FUNC */
+
+/**
+ * Check two string for equality, ignoring case of US-ASCII letters.
+ * @param str1 first string to compare
+ * @param str2 second string to compare
+ * @return non-zero if two strings are equal, zero otherwise.
+ */
+int
+MHD_str_equal_caseless_ (const char * str1, const char * str2)
+{
+  while (0 != (*str1))
+    {
+      const char c1 = *str1;
+      const char c2 = *str2;
+      if (c1 != c2 && toasciilower (c1) != toasciilower (c2))
+        return 0;
+      str1++;
+      str2++;
+    }
+  return 0 == (*str2);
+}
+
+
+/**
+ * Check two string for equality, ignoring case of US-ASCII letters and
+ * checking not more than @a maxlen characters.
+ * Compares up to first terminating null character, but not more than
+ * first @a maxlen characters.
+ * @param str1 first string to compare
+ * @param str2 second string to compare
+ * @patam maxlen maximum number of characters to compare
+ * @return non-zero if two strings are equal, zero otherwise.
+ */
+int
+MHD_str_equal_caseless_n_ (const char * const str1, const char * const str2, size_t maxlen)
+{
+  for (size_t i = 0; i < maxlen; ++i)
+    {
+      const char c1 = str1[i];
+      const char c2 = str2[i];
+      if (0 == c2)
+        return 0 == c1;
+      if (c1 != c2 && toasciilower (c1) != toasciilower (c2))
+        return 0;
+    }
+  return !0;
+}

src/microhttpd/mhd_str.h

@@ -0,0 +1,62 @@
+/*
+  This file is part of libmicrohttpd
+  Copyright (C) 2015 Karlson2k (Evgeny Grin)
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+/**
+ * @file microhttpd/mhd_str.h
+ * @brief  Header for string manipulating helpers
+ * @author Karlson2k (Evgeny Grin)
+ */
+
+#ifndef MHD_STR_H
+#define MHD_STR_H 1
+
+#include <stdint.h>
+
+/*
+ * Block of functions/macros that use US-ASCII charset as required by HTTP
+ * standards. Not affected by current locale settings.
+ */
+
+/**
+ * Check two string for equality, ignoring case of US-ASCII letters.
+ * @param str1 first string to compare
+ * @param str2 second string to compare
+ * @return non-zero if two strings are equal, zero otherwise.
+ */
+int
+MHD_str_equal_caseless_ (const char * str1,
+                 const char * str2);
+
+
+/**
+ * Check two string for equality, ignoring case of US-ASCII letters and
+ * checking not more than @a maxlen characters.
+ * Compares up to first terminating null character, but not more than
+ * first @a maxlen characters.
+ * @param str1 first string to compare
+ * @param str2 second string to compare
+ * @patam maxlen maximum number of characters to compare
+ * @return non-zero if two strings are equal, zero otherwise.
+ */
+int
+MHD_str_equal_caseless_n_ (const char * const str1,
+                  const char * const str2,
+                  size_t maxlen);
+
+#endif /* MHD_STR_H */

src/microhttpd/postprocessor.c

@@ -24,6 +24,7 @@
  */
 
 #include "internal.h"
+#include "mhd_str.h"
 
 /**
  * Size of on-stack buffer that we use for un-escaping of the value.

w32/common/MHD_config.h

@@ -9,6 +9,16 @@
 /* Define if MS VC compiler is used */
 #define MSVC 1
 
+/* Define to type which will be used as boolean type. */
+#define _MHD_bool _Bool
+
+/* Define to 1 if your C compiler supports inline functions. */
+#define INLINE_FUNC 1
+
+/* Define to prefix which will be used with MHD inline functions. */
+#define _MHD_inline static __forceinline
+
+
 /* *** MHD configuration *** */
 /* Undef to disable feature */
 

w32/common/libmicrohttpd-files.vcxproj

@@ -15,6 +15,7 @@
     <ClCompile Include="$(MhdSrc)microhttpd\response.c" />
     <ClCompile Include="$(MhdSrc)microhttpd\tsearch.c" />
     <ClCompile Include="$(MhdSrc)microhttpd\sysfdsetsize.c" />
+    <ClCompile Include="$(MhdSrc)microhttpd\mhd_str.c" />
     <ClCompile Include="$(MhdSrc)platform\w32functions.c" />
   </ItemGroup>
   <ItemGroup>
@@ -34,6 +35,7 @@
     <ClInclude Include="$(MhdSrc)microhttpd\response.h" />
     <ClInclude Include="$(MhdSrc)microhttpd\tsearch.h" />
     <ClInclude Include="$(MhdSrc)microhttpd\sysfdsetsize.h" />
+    <ClInclude Include="$(MhdSrc)microhttpd\mhd_str.h" />
     <ClInclude Include="$(MhdW32Common)MHD_config.h" />
   </ItemGroup>
   <ItemGroup>

w32/common/libmicrohttpd-filters.vcxproj

@@ -121,6 +121,12 @@
     <ClCompile Include="$(MhdSrc)microhttpd\sysfdsetsize.c">
       <Filter>Source Files</Filter>
     </ClCompile>
+    <ClInclude Include="$(MhdSrc)microhttpd\mhd_str.h">
+      <Filter>Source Files</Filter>
+    </ClInclude>
+    <ClCompile Include="$(MhdSrc)microhttpd\mhd_str.c">
+      <Filter>Source Files</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ResourceCompile Include="$(MhdW32Common)microhttpd_dll_res_vc.rc">