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‎docs/c-runtime-library/reference/access-s-waccess-s.md

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api_location: ["msvcrt.dll", "msvcr80.dll", "msvcr90.dll", "msvcr100.dll", "msvcr100_clr0400.dll", "msvcr110.dll", "msvcr110_clr0400.dll", "msvcr120.dll", "msvcr120_clr0400.dll", "ucrtbase.dll", "api-ms-win-crt-filesystem-l1-1-0.dll"]
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api_type: ["DLLExport"]
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topic_type: ["apiref"]
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f1_keywords: ["waccess_s", "access_s", "_waccess_s", "_access_s"]
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helpviewer_keywords: ["access_s function", "taccess_s function", "_taccess_s function", "waccess_s function", "_access_s function", "_waccess_s function"]
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ms.assetid: fb3004fc-dcd3-4569-8b27-d817546e947e
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f1_keywords: ["waccess_s", "access_s", "_waccess_s", "_access_s", "taccess_s"]
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helpviewer_keywords: ["access_s function", "taccess_s function", "waccess_s function", "_access_s function", "_waccess_s function"]
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---
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# `_access_s`, `_waccess_s`
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# `_access_s`, `_waccess_s`, `taccess_s`
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Determines file read/write permissions. These functions are versions of [`_access`, `_waccess`](access-waccess.md) with security enhancements as described in [Security features in the CRT](../security-features-in-the-crt.md).
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For `taccess_s`, see [Generic-text routine mappings](#generic-text-routine-mappings).
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## Syntax
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```C
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### Generic-text routine mappings
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| Tchar.h routine | `_UNICODE` and `_MBCS` not defined | `_MBCS` defined | `_UNICODE` defined |
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The function in the `tchar.h` column maps to the function in the other columns depending on the character set that is defined at compile time.
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| `tchar.h` function | `_UNICODE` and `_MBCS` not defined | `_MBCS` defined | `_UNICODE` defined |
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|---|---|---|---|
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| `_taccess_s` | **`_access_s`** | **`_access_s`** | **`_waccess_s`** |
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| `_taccess_s` | `_access_s` | `_access_s` | `_waccess_s` |
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## Requirements
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| Routine | Required header | Optional header |
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|---|---|---|
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| **`_access_s`** | \<io.h> | \<errno.h> |
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| **`_waccess_s`** | \<wchar.h> or \<io.h> | \<errno.h> |
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| **`_access_s`** | `<io.h>` | `<errno.h>` |
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| **`_waccess_s`** | `<wchar.h>` or `<io.h>` | `<errno.h>` |
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## Example
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‎docs/c-runtime-library/reference/fprintf-fprintf-l-fwprintf-fwprintf-l.md

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api_location: ["msvcrt.dll", "msvcr80.dll", "msvcr90.dll", "msvcr100.dll", "msvcr100_clr0400.dll", "msvcr110.dll", "msvcr110_clr0400.dll", "msvcr120.dll", "msvcr120_clr0400.dll", "ucrtbase.dll"]
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api_type: ["DLLExport"]
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topic_type: ["apiref"]
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f1_keywords: ["fprintf", "fwprintf", "_ftprintf"]
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helpviewer_keywords: ["_fwprintf_l function", "fprintf function", "fprintf_l function", "_fprintf_l function", "_ftprintf function", "fwprintf function", "ftprintf_l function", "ftprintf function", "_ftprintf_l function", "print formatted data to streams", "fwprintf_l function"]
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f1_keywords: ["fprintf", "fwprintf", "_ftprintf", "_fwprintf_l"]
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helpviewer_keywords: ["_fwprintf_l function", "fprintf function", "fprintf_l function", "_fprintf_l function", "_ftprintf function", "fwprintf function", "ftprintf_l function", "ftprintf function", "_fwprintf_l function", "_ftprintf_l function", "print formatted data to streams", "fwprintf_l function"]
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---
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# `fprintf`, `_fprintf_l`, `fwprintf`, `_fwprintf_l`
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### Generic-text routine mappings
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| `TCHAR.H` routine | `_UNICODE` and `_MBCS` not defined | `_MBCS` defined | `_UNICODE` defined |
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The function in the `tchar.h` column maps to the function in the other columns depending on the character set that is defined at compile time.
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| `tchar.h` function | `_UNICODE` and `_MBCS` not defined | `_MBCS` defined | `_UNICODE` defined |
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|---|---|---|---|
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| **`_ftprintf`** | **`fprintf`** | **`fprintf`** | **`fwprintf`** |
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| **`_ftprintf_l`** | **`_fprintf_l`** | **`_fprintf_l`** | **`_fwprintf_l`** |
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| `_ftprintf` | `fprintf` | `fprintf` | `fwprintf` |
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| `_ftprintf_l` | `_fprintf_l` | `_fprintf_l` | `_fwprintf_l` |
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For more information, see [Format specification syntax](../format-specification-syntax-printf-and-wprintf-functions.md).
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‎docs/c-runtime-library/reference/fprintf-p-fprintf-p-l-fwprintf-p-fwprintf-p-l.md

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api_location: ["msvcrt.dll", "msvcr80.dll", "msvcr90.dll", "msvcr100.dll", "msvcr100_clr0400.dll", "msvcr110.dll", "msvcr110_clr0400.dll", "msvcr120.dll", "msvcr120_clr0400.dll", "ucrtbase.dll"]
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f1_keywords: ["_fprintf_p", "_ftprintf_p", "fwprintf_p", "_fwprintf_p", "fprintf_p", "ftprintf_p"]
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f1_keywords: ["_fprintf_p", "_ftprintf_p", "fwprintf_p", "_fwprintf_p", "fprintf_p", "ftprintf_p", "_fwprintf_p_l"]
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helpviewer_keywords: ["fprintf_p_l function", "fprintf_p function", "_fprintf_p_l function", "_fprintf_p function", "_ftprintf_p_l function", "streams, printing formatted data to", "_fwprintf_p function", "fwprintf_p function", "_ftprintf_p function", "_fwprintf_p_l function", "ftprintf_p function", "printing [C++], formatted data to streams", "ftprintf_p_l function", "fwprintf_p_l function"]
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# `_fprintf_p`, `_fprintf_p_l`, `_fwprintf_p`, `_fwprintf_p_l`
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### Generic-text routine mappings
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| Tchar.h routine | `_UNICODE` and `_MBCS` not defined | `_MBCS` defined | `_UNICODE` defined |
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The function in the `tchar.h` column maps to the function in the other columns depending on the character set that is defined at compile time.
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| `tchar.h` function | `_UNICODE` and `_MBCS` not defined | `_MBCS` defined | `_UNICODE` defined |
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|---|---|---|---|
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| `_ftprintf_p` | **`_fprintf_p`** | **`_fprintf_p`** | **`_fwprintf_p`** |
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| `_ftprintf_p_l` | **`_fprintf_p_l`** | **`_fprintf_p_l`** | **`_fwprintf_p_l`** |
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| `_ftprintf_p` | `_fprintf_p` | `_fprintf_p` | `_fwprintf_p` |
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| `_ftprintf_p_l` | `_fprintf_p_l` | `_fprintf_p_l` | `_fwprintf_p_l` |
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For more information, see [Format specification syntax](../format-specification-syntax-printf-and-wprintf-functions.md).
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## Requirements
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| Function | Required header |
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| **`_fprintf_p`**, **`_fprintf_p_l`** | \<stdio.h> |
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| **`_fwprintf_p`**, **`_fwprintf_p_l`** | \<stdio.h> or \<wchar.h> |
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| `_fprintf_p`, `_fprintf_p_l` | `<stdio.h>` |
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| `_fwprintf_p`, `_fwprintf_p_l` | `<stdio.h>` or `<wchar.h>` |
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For more compatibility information, see [Compatibility](../compatibility.md).
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‎docs/c-runtime-library/reference/fprintf-s-fprintf-s-l-fwprintf-s-fwprintf-s-l.md

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api_location: ["msvcrt.dll", "msvcr80.dll", "msvcr90.dll", "msvcr100.dll", "msvcr100_clr0400.dll", "msvcr110.dll", "msvcr110_clr0400.dll", "msvcr120.dll", "msvcr120_clr0400.dll", "ucrtbase.dll"]
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f1_keywords: ["_ftprintf_s", "fprintf_s", "fwprintf_s"]
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helpviewer_keywords: ["ftprintf_s_l function", "ftprintf_s function", "_fprintf_s_l function", "_ftprintf_s function", "_ftprintf_s_l function", "fwprintf_s_l function", "fwprintf_s function", "fprintf_s_l function", "fprintf_s function", "_fwprintf_s_l function", "print formatted data to streams"]
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f1_keywords: ["_ftprintf_s", "fprintf_s", "fwprintf_s", "_fwprintf_s_l"]
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helpviewer_keywords: ["ftprintf_s_l function", "ftprintf_s function", "_fprintf_s_l function", "_ftprintf_s function", "_ftprintf_s_l function", "fwprintf_s_l function", "fwprintf_s function", "fprintf_s_l function", "fprintf_s function", "_fwprintf_s_l function", "_fwprintf_s_l function", "print formatted data to streams"]
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# `fprintf_s`, `_fprintf_s_l`, `fwprintf_s`, `_fwprintf_s_l`
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### Generic-text routine mappings
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| `TCHAR.H` routine | `_UNICODE` and `_MBCS` not defined | `_MBCS` defined | `_UNICODE` defined |
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The function in the `tchar.h` column maps to the function in the other columns depending on the character set that is defined at compile time.
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| `tchar.h` function | `_UNICODE` and `_MBCS` not defined | `_MBCS` defined | `_UNICODE` defined |
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| **`_ftprintf_s`** | **`fprintf_s`** | **`fprintf_s`** | **`fwprintf_s`** |
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| **`_ftprintf_s_l`** | **`_fprintf_s_l`** | **`_fprintf_s_l`** | **`_fwprintf_s_l`** |
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| `_ftprintf_s` | `fprintf_s` | `fprintf_s` | `fwprintf_s` |
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| `_ftprintf_s_l` | `_fprintf_s_l` | `_fprintf_s_l` | `_fwprintf_s_l` |
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For more information, see [Format specification syntax](../format-specification-syntax-printf-and-wprintf-functions.md).
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‎docs/c-runtime-library/reference/putenv-s-wputenv-s.md

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api_location: ["msvcrt.dll", "msvcr80.dll", "msvcr90.dll", "msvcr100.dll", "msvcr100_clr0400.dll", "msvcr110.dll", "msvcr110_clr0400.dll", "msvcr120.dll", "msvcr120_clr0400.dll", "ucrtbase.dll", "api-ms-win-crt-environment-l1-1-0.dll"]
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f1_keywords: ["putenv_s", "wputenv_s", "_wputenv_s", "_putenv_s"]
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helpviewer_keywords: ["wputenv_s function", "_putenv_s function", "environment variables, deleting", "putenv_s function", "_wputenv_s function", "environment variables, creating", "environment variables, modifying"]
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f1_keywords: ["putenv_s", "wputenv_s", "_wputenv_s", "_putenv_s", "_tputenv_s"]
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helpviewer_keywords: ["wputenv_s function", "_putenv_s function", "environment variables, deleting", "putenv_s function", "_wputenv_s function", "environment variables, creating", "environment variables, modifying", "_tputenv_s function"]
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# `_putenv_s`, `_wputenv_s`
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# `_putenv_s`, `_wputenv_s`, `_tputenv_s`
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Creates, modifies, or removes environment variables. These functions are versions of [`_putenv`, `_wputenv`](putenv-wputenv.md) that have security enhancements, as described in [Security features in the CRT](../security-features-in-the-crt.md).
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> [!IMPORTANT]
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For `_tputenv_s`, see [Generic-text routine mappings](#generic-text-routine-mappings).
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## Syntax
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| `TCHAR.H` routine | `_UNICODE` and `_MBCS` not defined | `_MBCS` defined | `_UNICODE` defined |
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The function in the `tchar.h` column maps to the function in the other columns depending on the character set that is defined at compile time.
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| `tchar.h` function | `_UNICODE` and `_MBCS` not defined | `_MBCS` defined | `_UNICODE` defined |
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| `_tputenv_s` | **`_putenv_s`** | **`_putenv_s`** | **`_wputenv_s`** |
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| `_tputenv_s` | `_putenv_s` | `_putenv_s` | `_wputenv_s` |
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*`varname`* is the name of the environment variable to be added or modified and *`value_string`* is the variable's value. If *`varname`* is already part of the environment, its value is replaced by *`value_string`*; otherwise, the new *`varname`* variable and its *`value_string`* are added to the environment. You can remove a variable from the environment by specifying an empty string (that is, `""`) for *`value_string`*.
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‎docs/c-runtime-library/reference/strncpy-s-strncpy-s-l-wcsncpy-s-wcsncpy-s-l-mbsncpy-s-mbsncpy-s-l.md

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api_location: ["msvcrt.dll", "msvcr80.dll", "msvcr90.dll", "msvcr100.dll", "msvcr100_clr0400.dll", "msvcr110.dll", "msvcr110_clr0400.dll", "msvcr120.dll", "msvcr120_clr0400.dll", "ucrtbase.dll", "api-ms-win-crt-multibyte-l1-1-0.dll", "api-ms-win-crt-string-l1-1-0.dll", "ntoskrnl.exe"]
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f1_keywords: ["_tcsncpy_s", "_wcsncpy_s_l", "strncpy_s", "_strncpy_s_l", "wcsncpy_s", "_tcsncpy_s_l"]
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helpviewer_keywords: ["_wcsncpy_s_l function", "_mbsnbcpy_s function", "_tcsncpy_s_l function", "mbsncpy_s function", "strncpy_s_l function", "_strncpy_s_l function", "strncpy_s function", "mbsncpy_s_l function", "wcsncpy_s function", "copying strings", "strings [C++], copying", "_mbsnbcpy_s_l function", "_tcsncpy_s function", "wcsncpy_s_l function"]
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ms.assetid: a971c800-94d1-4d88-92f3-a2fe236a4546
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f1_keywords: ["_tcsncpy_s", "_wcsncpy_s_l", "strncpy_s", "_strncpy_s_l", "wcsncpy_s", "_tcsncpy_s_l", "_tcsnccpy_s", "_tcsnccpy_s_l"]
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helpviewer_keywords: ["_wcsncpy_s_l function", "_mbsnbcpy_s function", "_tcsncpy_s_l function", "mbsncpy_s function", "strncpy_s_l function", "_strncpy_s_l function", "strncpy_s function", "mbsncpy_s_l function", "wcsncpy_s function", "_tcsnccpy_s function", "copying strings", "strings [C++], copying", "_mbsnbcpy_s_l function", "_tcsncpy_s function", "wcsncpy_s_l function", "_tcsnccpy_s_l function"]
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# `strncpy_s`, `_strncpy_s_l`, `wcsncpy_s`, `_wcsncpy_s_l`, `_mbsncpy_s`, `_mbsncpy_s_l`
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# `strncpy_s`, `_strncpy_s_l`, `wcsncpy_s`, `_wcsncpy_s_l`, `_mbsncpy_s`, `_mbsncpy_s_l`, `_tcsnccpy_s`, `_tcsnccpy_s_l`
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Copies characters of one string to another. These versions of [`strncpy`, `_strncpy_l`, `wcsncpy`, `_wcsncpy_l`, `_mbsncpy`, `_mbsncpy_l`](strncpy-strncpy-l-wcsncpy-wcsncpy-l-mbsncpy-mbsncpy-l.md) have security enhancements, as described in [Security features in the CRT](../security-features-in-the-crt.md).
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> [!IMPORTANT]
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> **`_mbsncpy_s`** and **`_mbsncpy_s_l`** cannot be used in applications that execute in the Windows Runtime. For more information, see [CRT functions not supported in Universal Windows Platform apps](../../cppcx/crt-functions-not-supported-in-universal-windows-platform-apps.md).
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For `_tcsnccpy_s` and `_tcsnccpy_s_l`, see [Generic-text routine mappings](#generic-text-routine-mappings).
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## Syntax
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```C
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| `TCHAR.H` routine | `_UNICODE` and `_MBCS` not defined | `_MBCS` defined | `_UNICODE` defined |
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The function in the `tchar.h` column maps to the function in the other columns depending on the character set that is defined at compile time.
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| `tchar.h` routine | `_UNICODE` and `_MBCS` not defined | `_MBCS` defined | `_UNICODE` defined |
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|---|---|---|---|
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| `_tcsncpy_s` | **`strncpy_s`** | **`_mbsnbcpy_s`** | **`wcsncpy_s`** |
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| `_tcsncpy_s_l` | **`_strncpy_s_l`** | **`_mbsnbcpy_s_l`** | **`_wcsncpy_s_l`** |
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| `_tcsnccpy_s` | **`strncpy_s`** | **`_mbsncpy_s`** | **`_wcsncpy_s`** |
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| `_tcsnccpy_s_l` | **`_strncpy_s_l`** | **`_mbsncpy_s_l`** | **`_wcsncpy_s_l`** |
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> [!NOTE]
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> **`_strncpy_s_l`**, **`_wcsncpy_s_l`** and **`_mbsncpy_s_l`** have no locale dependence. They're provided just for `_tcsncpy_s_l` and aren't intended to be called directly.

‎docs/c-runtime-library/reference/strnset-s-strnset-s-l-wcsnset-s-wcsnset-s-l-mbsnset-s-mbsnset-s-l.md

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api_location: ["msvcrt.dll", "msvcr80.dll", "msvcr90.dll", "msvcr100.dll", "msvcr100_clr0400.dll", "msvcr110.dll", "msvcr110_clr0400.dll", "msvcr120.dll", "msvcr120_clr0400.dll", "ucrtbase.dll", "api-ms-win-crt-multibyte-l1-1-0.dll", "api-ms-win-crt-string-l1-1-0.dll", "ntoskrnl.exe"]
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api_type: ["DLLExport"]
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f1_keywords: ["_mbsnset_s_l", "wcsnset_s", "_tcsnset_s_l", "_wcsnset_s", "_mbsnset_s", "_wcsnset_s_l", "_strnset_s_l", "strnset_s_l", "_tcsnset_s", "_strnset_s", "strnset_s", "mbsnset_s_l", "mbsnset_s", "wcsnset_s_l"]
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helpviewer_keywords: ["tcsnset_s function", "mbsnset_s_l function", "initializing characters", "wcsnset_s function", "mbsnset_s function", "_tcsnset_s_l function", "_strnset_s_l function", "_mbsnset_s function", "strnset_s_l function", "_tcsnset_s function", "_strnset_s function", "tcsnset_s_l function", "_mbsnset_s_l function", "strnset_s function", "_wcsnset_s function"]
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ms.assetid: 9cf1b321-b5cb-4469-b285-4c07cfbd8813
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f1_keywords: ["_mbsnset_s_l", "wcsnset_s", "_tcsnset_s_l", "_wcsnset_s", "_mbsnset_s", "_wcsnset_s_l", "_strnset_s_l", "strnset_s_l", "_tcsnset_s", "_strnset_s", "strnset_s", "mbsnset_s_l", "mbsnset_s", "wcsnset_s_l", "_tcsncset_s", "_tcsncset_s_l"]
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helpviewer_keywords: ["tcsnset_s function", "mbsnset_s_l function", "initializing characters", "wcsnset_s function", "mbsnset_s function", "_tcsnset_s_l function", "_strnset_s_l function", "_mbsnset_s function", "strnset_s_l function", "_tcsnset_s function", "_strnset_s function", "tcsnset_s_l function", "_mbsnset_s_l function", "strnset_s function", "_wcsnset_s function", "_tcsncset_s function", "_tcsncset_s_l function"]
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---
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# `_strnset_s`, `_strnset_s_l`, `_wcsnset_s`, `_wcsnset_s_l`, `_mbsnset_s`, `_mbsnset_s_l`
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# `_strnset_s`, `_strnset_s_l`, `_wcsnset_s`, `_wcsnset_s_l`, `_mbsnset_s`, `_mbsnset_s_l`, `_tcsncset_s`, `_tcsncset_s_l`
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Initializes characters of a string to a given character. These versions of [`_strnset`, `_strnset_l`, `_wcsnset`, `_wcsnset_l`, `_mbsnset`, `_mbsnset_l`](strnset-strnset-l-wcsnset-wcsnset-l-mbsnset-mbsnset-l.md) have security enhancements, as described in [Security features in the CRT](../security-features-in-the-crt.md).
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> [!IMPORTANT]
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> **`_mbsnset_s`** and **`_mbsnset_s_l`** cannot be used in applications that execute in the Windows Runtime. For more information, see [CRT functions not supported in Universal Windows Platform apps](../../cppcx/crt-functions-not-supported-in-universal-windows-platform-apps.md).
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For `_tcsncset_s` and `_tcsncset_s_l`, see [Generic-text routine mappings](#generic-text-routine-mappings).
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## Syntax
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```C
@@ -92,26 +93,30 @@ These functions set, at most, the first *`count`* characters of *`str`* to *`c`*
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The output value is affected by the setting of the `LC_CTYPE` category setting of the locale. For more information, see [`setlocale`](setlocale-wsetlocale.md). The versions of these functions without the `_l` suffix use the current locale for this locale-dependent behavior; the versions with the `_l` suffix are identical except that they use the locale parameter passed in instead. For more information, see [Locale](../locale.md).
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The debug library versions of these functions first fill the buffer with 0xFE. To disable this behavior, use [`_CrtSetDebugFillThreshold`](crtsetdebugfillthreshold.md).
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The debug library versions of these functions first fill the buffer with `0xFE`. To disable this behavior, use [`_CrtSetDebugFillThreshold`](crtsetdebugfillthreshold.md).
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By default, this function's global state is scoped to the application. To change this behavior, see [Global state in the CRT](../global-state.md).
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### Generic-text routine mappings
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| TCHAR.H routine | `_UNICODE` and `_MBCS` not defined | `_MBCS` defined | `_UNICODE` defined |
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The function in the `tchar.h` column maps to the function in the other columns depending on the character set that is defined at compile time.
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| `tchar.h` function | `_UNICODE` and `_MBCS` not defined | `_MBCS` defined | `_UNICODE` defined |
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|---|---|---|---|
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| `_tcsnset_s` | **`_strnset_s`** | **`_mbsnbset_s`** | **`_wcsnset_s`** |
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| `_tcsnset_s_l` | **`_strnset_s_l`** | **`_mbsnbset_s_l`** | **`_wcsnset_s_l`** |
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| `_tcsnset_s` | `_strnset_s` | `_mbsnbset_s` | `_wcsnset_s` |
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| `_tcsnset_s_l` | `_strnset_s_l` | `_mbsnbset_s_l` | `_wcsnset_s_l` |
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| `_tcsncset_s` | `_strnset_s` | `_mbsnset_s` | `_wcsnset_s` |
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| `_tcsncset_s_l` | `_strnset_s_l` | `_mbsnset_s_l` | `_wcsnset_s_l` |
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## Requirements
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| Routine | Required header |
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|---|---|
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| **`_strnset_s`** | \<string.h> |
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| **`_strnset_s_l`** | \<tchar.h> |
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| **`_wcsnset_s`** | \<string.h> or \<wchar.h> |
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| **`_wcsnset_s_l`** | \<tchar.h> |
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| **`_mbsnset_s`**, **`_mbsnset_s_l`** | \<mbstring.h> |
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| **`_strnset_s`** | `<string.h>` |
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| **`_strnset_s_l`** | `<tchar.h>` |
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| **`_wcsnset_s`** | `<string.h>` or `<wchar.h>` |
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| **`_wcsnset_s_l`** | `<tchar.h>` |
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| **`_mbsnset_s`**, **`_mbsnset_s_l`** | `<mbstring.h>` |
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For more compatibility information, see [Compatibility](../compatibility.md).
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