util/StringCompare: add more function attributes

src/util/StringCompare.cxx

 /*
- * Copyright (C) 2013-2017 Max Kellermann <max.kellermann@gmail.com>
+ * Copyright 2013-2018 Max Kellermann <max.kellermann@gmail.com>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions

src/util/StringCompare.hxx

 /*
- * Copyright (C) 2013-2017 Max Kellermann <max.kellermann@gmail.com>
+ * Copyright 2013-2018 Max Kellermann <max.kellermann@gmail.com>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -38,6 +38,7 @@
 #include "WStringCompare.hxx"
 #endif
 
+gcc_pure gcc_nonnull_all
 static inline bool
 StringIsEmpty(const char *string) noexcept
 {
@@ -51,7 +52,7 @@ StringStartsWith(const char *haystack, StringView needle) noexcept
 	return StringIsEqual(haystack, needle.data, needle.size);
 }
 
-gcc_pure
+gcc_pure gcc_nonnull_all
 bool
 StringEndsWith(const char *haystack, const char *needle) noexcept;
 
@@ -73,7 +74,7 @@ StringAfterPrefix(const char *haystack, StringView needle) noexcept
  * Check if the given string ends with the specified suffix.  If yes,
  * returns the position of the suffix, and nullptr otherwise.
  */
-gcc_pure
+gcc_pure gcc_nonnull_all
 const char *
 FindStringSuffix(const char *p, const char *suffix) noexcept;
 

src/util/WStringCompare.cxx

 /*
- * Copyright (C) 2013-2017 Max Kellermann <max.kellermann@gmail.com>
+ * Copyright 2013-2018 Max Kellermann <max.kellermann@gmail.com>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions

src/util/WStringCompare.hxx

 /*
- * Copyright (C) 2013-2015 Max Kellermann <max.kellermann@gmail.com>
+ * Copyright 2013-2018 Max Kellermann <max.kellermann@gmail.com>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -36,6 +36,7 @@
 
 #include <wchar.h>
 
+gcc_pure gcc_nonnull_all
 static inline bool
 StringIsEmpty(const wchar_t *string) noexcept
 {
@@ -49,7 +50,7 @@ StringStartsWith(const wchar_t *haystack, WStringView needle) noexcept
 	return StringIsEqual(haystack, needle.data, needle.size);
 }
 
-gcc_pure
+gcc_pure gcc_nonnull_all
 bool
 StringEndsWith(const wchar_t *haystack, const wchar_t *needle) noexcept;
 
@@ -71,7 +72,7 @@ StringAfterPrefix(const wchar_t *haystack, WStringView needle) noexcept
  * Check if the given string ends with the specified suffix.  If yes,
  * returns the position of the suffix, and nullptr otherwise.
  */
-gcc_pure
+gcc_pure gcc_nonnull_all
 const wchar_t *
 FindStringSuffix(const wchar_t *p, const wchar_t *suffix) noexcept;