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aligned_alloc()

Pointer to space

NULL

asctime_s()

0

Nonzero

at_quick_exit()

0

Nonzero

atexit()

0

Nonzero

bsearch()

Pointer to matching element

NULL

bsearch_s()

Pointer to matching element

NULL

btowc()

Converted wide character

WEOF

c16rtomb()

Number of bytes

(size_t)(-1)

c32rtomb()

Number of bytes

(size_t)(-1)

calloc()

Pointer to space

NULL

clock()

Processor time

(clock_t)(-1)

cnd_broadcast()

thrd_success

thrd_error

cnd_init()

thrd_success

thrd_nomem or thrd_error

cnd_signal()

thrd_success

thrd_error

cnd_timedwait()

thrd_success

thrd_timedout or thrd_error

cnd_wait()

thrd_success

thrd_error

ctime_s()

0

Nonzero

fclose()

0

EOF (negative)

fflush()

0

EOF (negative)

fgetc()

Character read

EOF¹

fgetpos()

0

Nonzero, errno > 0

fgets()

Pointer to string

NULL

fgetwc()

Wide character read

WEOF¹

fopen()

Pointer to stream

NULL

fopen_s()

0

Nonzero

fprintf()

Number of characters (nonnegative)

Negative

fprintf_s()

Number of characters (nonnegative)

Negative

fputc()

Character written

EOF²

fputs()

Nonnegative

EOF (negative)

fputws()

Nonnegative

EOF (negative)

fread()

Elements read

Elements read

freopen()

Pointer to stream

NULL

freopen_s()

0

Nonzero

fscanf()

Number of conversions (nonnegative)

EOF (negative)

fscanf_s()

Number of conversions (nonnegative)

EOF (negative)

fseek()

0

Nonzero

fsetpos()

0

Nonzero, errno > 0

ftell()

File position

−1L, errno > 0

fwprintf()

Number of wide characters (nonnegative)

Negative

fwprintf_s()

Number of wide characters (nonnegative)

Negative

fwrite()

Elements written

Elements written

fwscanf()

Number of conversions (nonnegative)

EOF (negative)

fwscanf_s()

Number of conversions (nonnegative)

EOF (negative)

getc()

Character read

EOF¹

getchar()

Character read

EOF¹

getenv()

Pointer to string

NULL

getenv_s()

Pointer to string

NULL

gets_s()

Pointer to string

NULL

getwc()

Wide character read

WEOF

getwchar()

Wide character read

WEOF

gmtime()

Pointer to broken-down time

NULL

gmtime_s()

Pointer to broken-down time

NULL

localtime()

Pointer to broken-down time

NULL

localtime_s()

Pointer to broken-down time

NULL

malloc()

Pointer to space

NULL

mblen(), s != NULL

Number of bytes

−1

mbrlen(), s != NULL

Number of bytes or status

(size_t)(-1)

mbrtoc16()

Number of bytes or status

(size_t)(-1), errno == EILSEQ

mbrtoc32()

Number of bytes or status

(size_t)(-1), errno == EILSEQ

mbrtowc(), s != NULL

Number of bytes or status

(size_t)(-1), errno == EILSEQ

mbsrtowcs()

Number of non-null elements

(size_t)(-1), errno == EILSEQ

mbsrtowcs_s()

0

Nonzero

mbstowcs()

Number of non-null elements

(size_t)(-1)

mbstowcs_s()

0

Nonzero

mbtowc(), s != NULL

Number of bytes

−1

memchr()

Pointer to located character

NULL

mktime()

Calendar time

(time_t)(-1)

mtx_init()

thrd_success

thrd_error

mtx_lock()

thrd_success

thrd_error

mtx_timedlock()

thrd_success

thrd_timedout or thrd_error

mtx_trylock()

thrd_success

thrd_busy or thrd_error

mtx_unlock()

thrd_success

thrd_error

printf_s()

Number of characters (nonnegative)

Negative

putc()

Character written

EOF²

putwc()

Wide character written

WEOF

raise()

0

Nonzero

realloc()

Pointer to space

NULL

remove()

0

Nonzero

rename()

0

Nonzero

setlocale()

Pointer to string

NULL

setvbuf()

0

Nonzero

scanf()

Number of conversions (nonnegative)

EOF (negative)

scanf_s()

Number of conversions (nonnegative)

EOF (negative)

signal()

Pointer to previous function

SIG_ERR, errno > 0

snprintf()

Number of characters that would be written (nonnegative)

Negative

snprintf_s()

Number of characters that would be written (nonnegative)

Negative

sprintf()

Number of non-null characters written

Negative

sprintf_s()

Number of non-null characters written

Negative

sscanf()

Number of conversions (nonnegative)

EOF (negative)

sscanf_s()

Number of conversions (nonnegative)

EOF (negative)

strchr()

Pointer to located character

NULL

strerror_s()

0

Nonzero

strftime()

Number of non-null characters

0

strpbrk()

Pointer to located character

NULL

strrchr()

Pointer to located character

NULL

strstr()

Pointer to located string

NULL

strtod()

Converted value

0, errno == ERANGE

strtof()

Converted value

0, errno == ERANGE

strtoimax()

Converted value

INTMAX_MAX or INTMAX_MIN, errno == ERANGE

strtok()

Pointer to first character of a token

NULL

strtok_s()

Pointer to first character of a token

NULL

strtol()

Converted value

LONG_MAX or LONG_MIN, errno == ERANGE

strtold()

Converted value

0, errno == ERANGE

strtoll()

Converted value

LLONG_MAX or LLONG_MIN, errno == ERANGE

strtoumax()

Converted value

UINTMAX_MAX, errno == ERANGE

strtoul()

Converted value

ULONG_MAX, errno == ERANGE

strtoull()

Converted value

ULLONG_MAX, errno == ERANGE

strxfrm()

Length of transformed string

>= n

swprintf()

Number of non-null wide characters

Negative

swprintf_s()

Number of non-null wide characters

Negative

swscanf()

Number of conversions (nonnegative)

EOF (negative)

swscanf_s()

Number of conversions (nonnegative)

EOF (negative)

thrd_create()

thrd_success

thrd_nomem or thrd_error

thrd_detach()

thrd_success

thrd_error

thrd_join()

thrd_success

thrd_error

thrd_sleep()

0

Negative

time()

Calendar time

(time_t)(-1)

timespec_get()

Base

0

tmpfile()

Pointer to stream

NULL

tmpfile_s()

0

Nonzero

tmpnam()

Non-null pointer

NULL

tmpnam_s()

0

Nonzero

tss_create()

thrd_success

thrd_error

tss_get()

Value of thread-specific storage

0

tss_set()

thrd_success

thrd_error

ungetc()

Character pushed back

EOF (see below)

ungetwc()

Character pushed back

WEOF

vfprintf()

Number of characters (nonnegative)

Negative

vfprintf_s()

Number of characters (nonnegative)

Negative

vfscanf()

Number of conversions (nonnegative)

EOF (negative)

vfscanf_s()

Number of conversions (nonnegative)

EOF (negative)

vfwprintf()

Number of wide characters (nonnegative)

Negative

vfwprintf_s()

Number of wide characters (nonnegative)

Negative

vfwscanf()

Number of conversions (nonnegative)

EOF (negative)

vfwscanf_s()

Number of conversions (nonnegative)

EOF (negative)

vprintf_s()

Number of characters (nonnegative)

Negative

vscanf()

Number of conversions (nonnegative)

EOF (negative)

vscanf_s()

Number of conversions (nonnegative)

EOF (negative)

vsnprintf()

Number of characters that would be written (nonnegative)

Negative

vsnprintf_s()

Number of characters that would be written (nonnegative)

Negative

vsprintf()

Number of non-null characters (nonnegative)

Negative

vsprintf_s()

Number of non-null characters (nonnegative)

Negative

vsscanf()

Number of conversions (nonnegative)

EOF (negative)

vsscanf_s()

Number of conversions (nonnegative)

EOF (negative)

vswprintf()

Number of non-null wide characters

Negative

vswprintf_s()

Number of non-null wide characters

Negative

vswscanf()

Number of conversions (nonnegative)

EOF (negative)

vswscanf_s()

Number of conversions (nonnegative)

EOF (negative)

vwprintf_s()

Number of wide characters (nonnegative)

Negative

vwscanf()

Number of conversions (nonnegative)

EOF (negative)

vwscanf_s()

Number of conversions (nonnegative)

EOF (negative)

wcrtomb()

Number of bytes stored

(size_t)(-1)

wcschr()

Pointer to located wide character

NULL

wcsftime()

Number of non-null wide characters

0

wcspbrk()

Pointer to located wide character

NULL

wcsrchr()

Pointer to located wide character

NULL

wcsrtombs()

Number of non-null bytes

(size_t)(-1), errno == EILSEQ

wcsrtombs_s()

0

Nonzero

wcsstr()

Pointer to located wide string

NULL

wcstod()

Converted value

0, errno == ERANGE

wcstof()

Converted value

0, errno == ERANGE

wcstoimax()

Converted value

INTMAX_MAX or INTMAX_MIN, errno == ERANGE

wcstok()

Pointer to first wide character of a token

NULL

wcstok_s()

Pointer to first wide character of a token

NULL

wcstol()

Converted value

LONG_MAX or LONG_MIN, errno == ERANGE

wcstold()

Converted value

0, errno == ERANGE

wcstoll()

Converted value

LLONG_MAX or LLONG_MIN, errno == ERANGE

wcstombs()

Number of non-null bytes

(size_t)(-1)

wcstombs_s()

0

Nonzero

wcstoumax()

Converted value

UINTMAX_MAX, errno == ERANGE

wcstoul()

Converted value

ULONG_MAX, errno == ERANGE

wcstoull()

Converted value

ULLONG_MAX, errno == ERANGE

wcsxfrm()

Length of transformed wide string

>= n

wctob()

Converted character

EOF

wctomb(), s != NULL

Number of bytes stored

−1

wctomb_s(), s != NULL

Number of bytes stored

−1

wctrans()

Valid argument to towctrans

0

wctype()

Valid argument to iswctype

0

wmemchr()

Pointer to located wide character

NULL

wprintf_s()

Number of wide characters (nonnegative)

Negative

wscanf()

Number of conversions (nonnegative)

EOF (negative)

wscanf_s()

Number of conversions (nonnegative)

EOF (negative)