21 Strings library [strings]

Tables [tab:strings.hdr.cctype], [tab:strings.hdr.cwctype], [tab:strings.hdr.cstring], [tab:strings.hdr.cwchar], [tab:strings.hdr.cstdlib], and [tab:strings.hdr.cuchar] describe headers <cctype>, <cwctype>, <cstring>, <cwchar>, <cstdlib> (character conversions), and <cuchar>, respectively.

The contents of these headers shall be the same as the Standard C Library headers <ctype.h>, <wctype.h>, <string.h>, <wchar.h>, and <stdlib.h> and the C Unicode TR header <uchar.h>, respectively, with the following modifications:

The headers shall not define the types char16_t, char32_t, and wchar_t ([lex.key]).

The function signature strchr(const char*, int) shall be replaced by the two declarations:

const char* strchr(const char* s, int c);
      char* strchr(      char* s, int c);

both of which shall have the same behavior as the original declaration.

The function signature strpbrk(const char*, const char*) shall be replaced by the two declarations:

const char* strpbrk(const char* s1, const char* s2);
      char* strpbrk(      char* s1, const char* s2);

both of which shall have the same behavior as the original declaration.

The function signature strrchr(const char*, int) shall be replaced by the two declarations:

const char* strrchr(const char* s, int c);
      char* strrchr(      char* s, int c);

both of which shall have the same behavior as the original declaration.

The function signature strstr(const char*, const char*) shall be replaced by the two declarations:

const char* strstr(const char* s1, const char* s2);
      char* strstr(      char* s1, const char* s2);

both of which shall have the same behavior as the original declaration.

The function signature memchr(const void*, int, size_t) shall be replaced by the two declarations:

const void* memchr(const void* s, int c, size_t n);
      void* memchr(      void* s, int c, size_t n);

both of which shall have the same behavior as the original declaration.

The function signature wcschr(const wchar_t*, wchar_t) shall be replaced by the two declarations:

const wchar_t* wcschr(const wchar_t* s, wchar_t c);
      wchar_t* wcschr(      wchar_t* s, wchar_t c);

both of which shall have the same behavior as the original declaration.

The function signature wcspbrk(const wchar_t*, const wchar_t*) shall be replaced by the two declarations:

const wchar_t* wcspbrk(const wchar_t* s1, const wchar_t* s2);
      wchar_t* wcspbrk(      wchar_t* s1, const wchar_t* s2);

both of which shall have the same behavior as the original declaration.

The function signature wcsrchr(const wchar_t*, wchar_t) shall be replaced by the two declarations:

const wchar_t* wcsrchr(const wchar_t* s, wchar_t c);
      wchar_t* wcsrchr(      wchar_t* s, wchar_t c);

both of which shall have the same behavior as the original declaration.

The function signature wcsstr(const wchar_t*, const wchar_t*) shall be replaced by the two declarations:

const wchar_t* wcsstr(const wchar_t* s1, const wchar_t* s2);
      wchar_t* wcsstr(      wchar_t* s1, const wchar_t* s2);

both of which shall have the same behavior as the original declaration.

The function signature wmemchr(const wwchar_t*, int, size_t) shall be replaced by the two declarations:

const wchar_t* wmemchr(const wchar_t* s, wchar_t c, size_t n);
      wchar_t* wmemchr(      wchar_t* s, wchar_t c, size_t n);

both of which shall have the same behavior as the original declaration.

The functions strerror and strtok are not required to avoid data races ([res.on.data.races]).

Calling the functions listed in Table [tab:mbstate.data.races] with an mbstate_t* argument of NULL may introduce a data race ([res.on.data.races]) with other calls to these functions with an mbstate_t* argument of NULL.

See also: ISO C 7.3, 7.10.7, 7.10.8, and 7.11. Amendment 1 4.4, 4.5, and 4.6.