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The gets() function was deprecated by Technical Corrigendum 3 to C99 and eliminated from C11. The Annex K gets_s() function is a recommended alternative to gets().
Obsolescent Functions
Functions in the first column of the following table are hereby defined to be obsolescent functions. To remediate invocations of obsolescent functions, an application might use inline coding that, in all respects, conforms to this guideline, or an alternative library that, in all respects, conforms to this guideline, or alternative non-obsolescent functions.
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Unchecked Obsolescent Functions
The following If you are using platforms that support Annex K, then functions in the first column of the following table are hereby defined to be unchecked obsolescent functions:
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bsearch
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fprintf
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fscanf
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fwprintf
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fwscanf
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getenv
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gmtime
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localtime
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mbsrtowcs
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mbstowcs
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memcpy
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memmove
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printf
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qsort
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setbuf
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snprintf
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sprintf
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sscanf
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strcat
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strcpy
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strerror
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strncat
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strncpy
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strtok
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swprintf
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swscanf
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vfprintf
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vfscanf
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vfwprintf
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vfwscanf
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vprintf
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vscanf
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vsnprintf
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vsprintf
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vsscanf
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vswprintf
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vswscanf
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vwprintf
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vwscanf
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wcrtomb
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wcscat
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wcscpy
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wcsncat
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wcsncpy
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wcsrtombs
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wcstok
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wcstombs
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wctomb
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wmemcpy
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wmemmove
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wprintf
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wscanf
To remediate invocations of unchecked obsolescent functions, an application might use inline coding that, in all respects, conforms to this guideline, or an alternative library that, in all respects, conforms to this guideline, or alternative nonobsolescent functions from C11, Annex K:
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abort_handler_s
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bsearch_s
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fprintf_s
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freopen_s
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fscanf_s
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fwprintf_s
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fwscanf_s
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getenv_s
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gets_s
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gmtime_s
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ignore_handler_s
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localtime_s
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mbsrtowcs_s
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mbstowcs_s
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memcpy_s
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memmove_s
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printf_s
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qsort_s
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scanf_s
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set_constraint_handler_s
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snprintf_s
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snwprintf_s
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sprintf_s
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sscanf_s
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strcat_s
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strcpy_s
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strerror_s
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strerrorlen_s
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strncat_s
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strncpy_s
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strnlen_s
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strtok_s
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swprintf_s
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swscanf_s
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vfprintf_s
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vfscanf_s
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vfwprintf_s
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vfwscanf_s
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vprintf_s
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vscanf_s
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vsnprintf_s
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vsnwprintf_s
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vsprintf_s
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vsscanf_s
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vswprintf_s
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vswscanf_s
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vwprintf_s
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vwscanf_s
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wcrtomb_s
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wcrtoms_s
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wcscat_s
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wcscpy_s
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wcsncat_s
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wcsncpy_s
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wcsnlen_s
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wcsrtombs_s
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wcstok_s
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wcstombs_s
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wctomb_s
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wmemcpy_s
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wmemmove_s
obsolescent functions, with functions in the second column being the recommended alternatives from Annex K.
Obsolescent | Recommended |
|---|---|
| bsearch() | bsearch_s() |
| fprintf() | fprintf_s() |
| fscanf() | fscanf_s() |
| fwprintf() | fwprintf_s() |
| fwscanf() | fwscanf_s() |
| getenv() | getenv_s() |
| gmtime() | gmtime_s() |
| localtime() | localtime_s() |
| mbsrtowcs() | mbsrtowcs_s() |
| mbstowcs() | mbstowcs_s() |
| memcpy() | memcpy_s() |
| memmove() | memmove_s() |
| printf() | printf_s() |
| qsort() | qsort_s() |
| scanf() | scanf_s() |
| snprintf() | snprintf_s() |
| sprintf() | sprintf_s() |
| sscanf() | sscanf_s() |
| strcat() | strcat_s() |
| strcpy() | strcpy_s() |
| strerror() | strerror_s() |
| strlen() | strnlen_s() |
| strncat() | strncat_s() |
| strncpy() | strncpy_s() |
| strtok() | strtok_s() |
| swprintf() | swprintf_s() |
| swscanf() | swscanf_s() |
| vfprintf() | vfprintf_s() |
| vfscanf() | vfscanf_s() |
| vfwprintf() | vfwprintf_s() |
| vfwscanf() | vfwscanf_s() |
| vprintf() | vprintf_s() |
| vscanf() | vscanf_s() |
| vsnprintf() | vsnprintf_s() |
| vsprintf() | vsprintf_s() |
| vsscanf() | vsscanf_s() |
| vswprintf() | vswprintf_s() |
| vswscanf() | vswscanf_s() |
| vwprintf() | vwprintf_s() |
| vwscanf() | vwscanf_s() |
| wcrtomb() | wcrtomb_s() |
| wcscat() | wcscat_s() |
| wcscpy() | wcscpy_s() |
| wcslen() | wcsnlen_s() |
| wcsncat() | wcsncat_s() |
| wcsncpy() | wcsncpy_s() |
| wcsrtombs() | wcsrtombs_s() |
| wcstok() | wcstok_s() |
| wcstombs() | wcstombs_s() |
| wctomb() | wctomb_s() |
| wmemcpy() | wmemcpy_s() |
| wmemmove() | wmemmove_s() |
| wprintf() | wprintf_s() |
| wscanf() | wscanf_s() |
For information on the tmpfile() and tmpfile_s() functions, see FIO21-C. Do not create temporary files in shared directories.
For information on the memset() and memset_s() functions, see MSC06-C. Beware of compiler optimizations.
To remediate invocations of obsolescent functions, an application might use any of the following recommended functions from ISO
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wprintf_s
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wscanf_s
or alternative nonobsolescent functions from ISO/IEC TR 24731-2, Extensions to the C Library—Part II: Dynamic Allocation Functions [ISO/IEC TR 24731-2]:
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| Tool | Version | Checker | Description | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Astrée |
| stdlib-use-ato stdlib-macro-ato stdlib-use-atoll stdlib-macro-atoll | Partially checked | ||||||||||
| Axivion Bauhaus Suite |
| CertC-MSC24 | Fully implemented | ||||||||||
| CodeSonar |
| BADFUNC.* | A number of CodeSonar's "Use of *" checks are for deprecated/obsolescent functions | ||||||||||
| CC2.MSC34 | Fully implemented | |||||||||||
| LDRA tool suite |
| 44 S | Fully implemented | ||||||||||
| Parasoft C/C++test |
| CERT_C-MSC24-a | The library functions atof, atoi and atol from library stdlib.h shall not be used | ||||||||||
| PC-lint Plus |
| 586 | Fully supported | ||||||||||
| Polyspace Bug Finder |
| R2016a |
| CERT C: Rec. MSC24-C | Checks for use Use of obsolete standard function (rec. fully covered) Obsolete routines can cause security vulnerabilities and portability issues | ||||||||
| PVS-Studio |
| V513, V2001, V2002 | |||||||||||
| RuleChecker |
| stdlib-use-ato stdlib-macro-ato stdlib-use-atoll stdlib-macro-atoll | Partially checked |
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| [Apple 2006] | Apple Secure Coding Guide, "Avoiding Race Conditions and Insecure File Operations" |
| [Burch 2006] | Specifications for Managed Strings, Second Edition |
| [Drepper 2006] | Section 2.2.1 "Identification When Opening" |
| [IEEE Std 1003.1:2013] | XSH, System Interfaces, open |
| ISO/IEC 23360-1:2006 | |
| [ISO/IEC WG14 N1173] | Rationale for TR 24731 Extensions to the C Library Part I: Bounds-checking interfaces |
| [Klein 2002] | "Bullet Proof Integer Input Using strtol()" |
| [Linux 2008] | strtok(3) |
| [Seacord 2013] | Chapter 2, "Strings" Chapter 8, "File I/O" |
| [Seacord 2005b] | "Managed String Library for C, C/C++" |
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