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Following is an incomplete list of C library functions to which this rule applies :to.
Library functions that take a pointer and integer
The following standard library functions take a pointer argument and a size argument, with the constraint that the pointer must point to a valid memory object of at least the number of bytes or wide characters (as appropriate) indicated by the size argument.
fgets() | fread()* | fwrite()* | mblen() |
memchr() | memset() | fgetws() | wmemchr() |
wmemset() | mbrlen() | tmpnam_s() | gets_s() |
getenv_s() | memset_s() | strerror_s() | strnlen_s() |
asctime_s() | ctime_s() | wcscpy_s() | wcsncpy_s() |
wmemcpy_s() | wmemmove_s() | wcscat_s() | wcsncat_s() |
wcsnlen_s() |
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Library functions that take two pointers and an integer
The following standard library functions take two pointer arguments and a size argument, with the constraint that both pointers must point to valid memory objects of at least the number of bytes or wide characters as appropriate, indicated by the size argument.
mbtowc() | wctomb() | mbtowcs() | wcstombs() |
memcpy() | memmove() | strncpy() | strncat() |
memcmp() | strncmp() | strxfrm() | mbrtoc16() |
mbrtoc32() | wcsncpymemset() | wmemcpy() | wmemmove() |
wcsncat() | wcsncmp() | wcsxfrm() | wmemcmp() |
mbrtowc() | wcrtomb() | mbsrtowcs() | wcsrtombs() |
wctomb_s() | mbtowcs_s() | strftimewcstombs_s() | callocmemcpy_s() |
mallocmemmove_s() | reallocstrcpy_s() | strncpy_s() | strcat_s() |
strncat_sswprintf() | vswprintfwcscpy_s() | wcsncpy_s() | wmemcpy_s() |
wmemmove_s() | wcscat_s() | wcsncat_s() | wcrtomb_s() |
mbsrtowcs_s() | wcsrtombs_s() |
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Library functions that take a pointer and two integers
The following standard library functions take a pointer argument and two size arguments, with the constraint that the pointer must point to a valid memory object containing at least as many bytes as the product of the two size arguments.
bsearch() |
qsort() |
bsearch_s() |
qsort_s() |
Standard memory allocation functions
The following are the standard memory allocation functions that take a size integer argument and return a pointer.
aligned_alloc() |
calloc() |
malloc() |
realloc() |
Other Library Functions:
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| vswprintf()swprintf() |
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strxfrmfwrite()* | freadsnprintf()* |
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*Both functions take more than one size_t argument. In such cases, the compliant code must be consistent with the purpose of these arguments. For example, in the case of fread():
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size_t fread(void *ptr, size_t size, size_t count, FILE *stream) |
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