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Showing content from https://timsong-cpp.github.io/cppwp/n4140/c.strings below:

[c.strings]

21.8 Null-terminated sequence utilities [c.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.

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.

Table

— Potential

mbstate_t

data races

mbrlen mbrtowc mbsrtowc mbtowc wcrtomb wcsrtomb wctomb

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

Table

— Header

<cctype>

synopsis

Type Name(s) Functions: isalnum isblank isdigit isprint isupper tolower isalpha isgraph ispunct isxdigit toupper iscntrl islower isspace

Table

— Header

<cwctype>

synopsis

Type Name(s) Macro: WEOF Types: wctrans_t wctype_t wint_t Functions: iswalnum iswctype iswprint iswxdigit wctrans iswalpha iswdigit iswpunct towctrans wctype iswblank iswgraph iswspace towlower iswcntrl iswlower iswupper towupper

Table

— Header

<cstring>

synopsis

Type Name(s) Macro: NULL <cstring> Type: size_t <cstring> Functions: memchr strcat strcspn strncpy strtok memcmp strchr strerror strpbrk strxfrm memcpy strcmp strlen strrchr memmove strcoll strncat strspn memset strcpy strncmp strstr

Table

— Header

<cwchar>

synopsis

Type Name(s) Macros: NULL WCHAR_MAX WCHAR_MIN WEOF Types: mbstate_t wint_t size_t tm Functions: btowc mbsinit vwscanf wcsncpy wcstoull fgetwc mbsrtowcs wcrtomb wcspbrk wcstoul fgetws putwchar wcscat wcsrchr wcsxfrm fputwc putwc wcschr wcsrtombs wctob fputws swprintf wcscmp wcsspn wmemchr fwide swscanf wcscoll wcsstr wmemcmp fwprintf ungetwc wcscpy wcstod wmemcpy fwscanf vfwprintf wcscspn wcstof wmemmove getwchar vfwscanf wcsftime wcstok wmemset getwc vswprintf wcslen wcstold wprintf mbrlen vswscanf wcsncat wcstoll wscanf mbrtowc vwprintf wcsncmp wcstol

Table

— Header

<cstdlib>

synopsis

Type Name(s) Macros: MB_CUR_MAX Functions: atof mblen strtof strtoul atoi mbtowc strtol strtoull atol mbstowcs strtold wctomb atoll strtod strtoll wcstombs

Table

— Header

<cuchar>

synopsis

Type Name(s) Macros: __STDC_UTF_16__ __STDC_UTF_32__ Functions: mbrtoc16 c16rtomb mbrtoc32 c32rtomb

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