14. C17 Standard Library

This chapter has a subsection per header file to detail the methods provided by RTEMS that are in that header file.

The follow table summarizes alignment with the C17 Standard Library standard:

Support	Amount
Supported	531
ENOSYS	1
Not supported	1

14.1. <assert.h>

The following methods and variables in <assert.h> are supported:

• assert()

14.2. <complex.h>

The following methods and variables in <complex.h> are supported:

• cabs()

• cabsf()

• cabsl()

• cacos()

• cacosf()

• cacosh()

• cacoshf()

• cacoshl()

• cacosl()

• carg()

• cargf()

• cargl()

• casin()

• casinf()

• casinh()

• casinhf()

• casinhl()

• casinl()

• catan()

• catanf()

• catanh()

• catanhf()

• catanhl()

• catanl()

• ccos()

• ccosf()

• ccosh()

• ccoshf()

• ccoshl()

• ccosl()

• cexp()

• cexpf()

• cexpl()

• cimag()

• cimagf()

• cimagl()

• clog()

• clogf()

• clogl()

• conj()

• conjf()

• conjl()

• cpow()

• cpowf()

• cpowl()

• cproj()

• cprojf()

• cprojl()

• creal()

• crealf()

• creall()

• csin()

• csinf()

• csinh()

• csinhf()

• csinhl()

• csinl()

• csqrt()

• csqrtf()

• csqrtl()

• ctan()

• ctanf()

• ctanh()

• ctanhf()

• ctanhl()

• ctanl()

14.3. <ctype.h>

The following methods and variables in <ctype.h> are supported:

• isalnum()

• isalpha()

• isblank()

• iscntrl()

• isdigit()

• isgraph()

• islower()

• isprint()

• ispunct()

• isspace()

• isupper()

• isxdigit()

• tolower()

• toupper()

14.4. <errno.h>

The following methods and variables in <errno.h> are supported:

• errno

14.5. <fenv.h>

The following methods and variables in <fenv.h> are supported:

• feclearexcept()

• fegetenv()

• fegetexceptflag()

• fegetround()

• feholdexcept()

• feraiseexcept()

• fesetenv()

• fesetexceptflag()

• fesetround()

• fetestexcept()

• feupdateenv()

14.6. <inttypes.h>

The following methods and variables in <inttypes.h> are supported:

• imaxabs()

• imaxdiv()

• strtoimax()

• strtoumax()

• wcstoimax()

• wcstoumax()

14.7. <locale.h>

The following methods and variables in <locale.h> are supported:

• localeconv()

• setlocale()

14.8. <math.h>

The following methods and variables in <math.h> are supported:

• acos()

• acosf()

• acosh()

• acoshf()

• acoshl()

• acosl()

• asin()

• asinf()

• asinh()

• asinhf()

• asinhl()

• asinl()

• atan()

• atan2()

• atan2f()

• atan2l()

• atanf()

• atanh()

• atanhf()

• atanhl()

• atanl()

• cbrt()

• cbrtf()

• cbrtl()

• ceil()

• ceilf()

• ceill()

• copysign()

• copysignf()

• copysignl()

• cos()

• cosf()

• cosh()

• coshf()

• coshl()

• cosl()

• erf()

• erfc()

• erfcf()

• erfcl()

• erff()

• erfl()

• exp()

• exp2()

• exp2f()

• exp2l()

• expf()

• expl()

• expm1()

• expm1f()

• expm1l()

• fabs()

• fabsf()

• fabsl()

• fdim()

• fdimf()

• fdiml()

• floor()

• floorf()

• floorl()

• fma()

• fmaf()

• fmal()

• fmax()

• fmaxf()

• fmaxl()

• fmin()

• fminf()

• fminl()

• fmod()

• fmodf()

• fmodl()

• fpclassify()

• frexp()

• frexpf()

• frexpl()

• hypot()

• hypotf()

• hypotl()

• ilogb()

• ilogbf()

• ilogbl()

• isfinite()

• isgreater()

• isgreaterequal()

• isinf()

• isless()

• islessequal()

• islessgreater()

• isnan()

• isnormal()

• isunordered()

• ldexp()

• ldexpf()

• ldexpl()

• lgamma()

• lgammaf()

• lgammal()

• llrint()

• llrintf()

• llrintl()

• llround()

• llroundf()

• llroundl()

• log()

• log10()

• log10f()

• log10l()

• log1p()

• log1pf()

• log1pl()

• log2()

• log2f()

• log2l()

• logb()

• logbf()

• logbl()

• logf()

• logl()

• lrint()

• lrintf()

• lrintl()

• lround()

• lroundf()

• lroundl()

• modf()

• modff()

• modfl()

• nan()

• nanf()

• nanl()

• nearbyint()

• nearbyintf()

• nearbyintl()

• nextafter()

• nextafterf()

• nextafterl()

• nexttoward()

• nexttowardf()

• nexttowardl()

• pow()

• powf()

• powl()

• remainder()

• remainderf()

• remainderl()

• remquo()

• remquof()

• remquol()

• rint()

• rintf()

• rintl()

• round()

• roundf()

• roundl()

• scalbln()

• scalblnf()

• scalblnl()

• scalbn()

• scalbnf()

• scalbnl()

• sin()

• sinf()

• sinh()

• sinhf()

• sinhl()

• sinl()

• sqrt()

• sqrtf()

• sqrtl()

• tan()

• tanf()

• tanh()

• tanhf()

• tanhl()

• tanl()

• tgamma()

• tgammaf()

• tgammal()

• trunc()

• truncf()

• truncl()

The following methods and variables in <math.h> are not supported:

• signbit()

14.9. <setjmp.h>

The following methods and variables in <setjmp.h> are supported:

• longjmp()

• setjmp()

14.10. <signal.h>

The following methods and variables in <signal.h> are supported:

• raise()

• signal()

14.11. <stdarg.h>

The following methods and variables in <stdarg.h> are supported:

• va_arg()

• va_copy()

• va_end()

• va_start()

14.12. <stdatomic.h>

The following methods and variables in <stdatomic.h> are supported:

• ATOMIC_VAR_INIT()

• atomic_compare_exchange_strong()

• atomic_compare_exchange_strong_explicit()

• atomic_compare_exchange_weak()

• atomic_compare_exchange_weak_explicit()

• atomic_exchange()

• atomic_exchange_explicit()

• atomic_fetch_key()

• atomic_fetch_key_explicit()

• atomic_flag_clear()

• atomic_flag_clear_explicit()

• atomic_flag_test_and_set()

• atomic_flag_test_and_set_explicit()

• atomic_init()

• atomic_is_lock_free()

• atomic_load()

• atomic_load_explicit()

• atomic_signal_fence()

• atomic_store()

• atomic_store_explicit()

• atomic_thread_fence()

14.13. <stddef.h>

The following methods and variables in <stddef.h> are supported:

• offsetof()

14.14. <stdint.h>

The following methods and variables in <stdint.h> are supported:

• INTMAX_C()

• INTN_C()

• UINTMAX_C()

• UINTN_C()

14.15. <stdio.h>

The following methods and variables in <stdio.h> are supported:

• clearerr()

• fclose()

• feof()

• ferror()

• fflush()

• fgetc()

• fgetpos()

• fgets()

• fopen()

• fprintf()

• fputc()

• fputs()

• fread()

• freopen()

• fscanf()

• fseek()

• fsetpos()

• ftell()

• fwrite()

• getc()

• getchar()

• perror()

• printf()

• puts()

• remove()

• rename()

• rewind()

• scanf()

• setbuf()

• setvbuf()

• snprintf()

• sprintf()

• sscanf()

• tmpfile()

• tmpnam()

• ungetc()

• vfprintf()

• vfscanf()

• vprintf()

• vscanf()

• vsnprintf()

• vsprintf()

• vsscanf()

14.16. <stdlib.h>

The following methods and variables in <stdlib.h> are supported:

• _Exit()

• abort()

• abs()

• aligned_alloc()

• at_quick_exit()

• atexit()

• atof()

• atoi()

• atol()

• atoll()

• bsearch()

• calloc()

• div()

• exit()

• free()

• getenv()

• labs()

• ldiv()

• llabs()

• lldiv()

• malloc()

• mblen()

• mbstowcs()

• mbtowc()

• qsort()

• quick_exit()

• rand()

• realloc()

• srand()

• strtod()

• strtof()

• strtol()

• strtold()

• strtoll()

• strtoul()

• strtoull()

• wcstombs()

• wctomb()

The following methods in <stdlib.h> are implemented as stubs returning -1 and setting errno to ENOSYS:

• system()

14.17. <string.h>

The following methods and variables in <string.h> are supported:

• memchr()

• memcmp()

• memcpy()

• memmove()

• memset()

• strcat()

• strchr()

• strcmp()

• strcoll()

• strcpy()

• strcspn()

• strerror()

• strlen()

• strncat()

• strncmp()

• strncpy()

• strpbrk()

• strrchr()

• strspn()

• strstr()

• strtok()

• strxfrm()

14.18. <threads.h>

The following methods and variables in <threads.h> are supported:

• call_once()

• cnd_broadcast()

• cnd_destroy()

• cnd_init()

• cnd_signal()

• cnd_timedwait()

• cnd_wait()

• mtx_destroy()

• mtx_init()

• mtx_lock()

• mtx_timedlock()

• mtx_trylock()

• mtx_unlock()

• thrd_create()

• thrd_current()

• thrd_detach()

• thrd_equal()

• thrd_exit()

• thrd_join()

• thrd_sleep()

• thrd_yield()

• tss_create()

• tss_delete()

• tss_get()

• tss_set()

14.19. <time.h>

The following methods and variables in <time.h> are supported:

• asctime()

• clock()

• ctime()

• difftime()

• gmtime()

• localtime()

• mktime()

• strftime()

• time()

14.20. <wchar.h>

The following methods and variables in <wchar.h> are supported:

• btowc()

• fgetwc()

• fgetws()

• fputwc()

• fputws()

• fwide()

• fwprintf()

• fwscanf()

• getwc()

• getwchar()

• mbrlen()

• mbrtowc()

• mbsinit()

• mbsrtowcs()

• putwc()

• putwchar()

• swprintf()

• swscanf()

• ungetwc()

• vfwprintf()

• vfwscanf()

• vswprintf()

• vswscanf()

• vwprintf()

• vwscanf()

• wcrtomb()

• wcscat()

• wcschr()

• wcscmp()

• wcscoll()

• wcscpy()

• wcscspn()

• wcsftime()

• wcslen()

• wcsncat()

• wcsncmp()

• wcsncpy()

• wcspbrk()

• wcsrchr()

• wcsrtombs()

• wcsspn()

• wcsstr()

• wcstod()

• wcstof()

• wcstok()

• wcstol()

• wcstold()

• wcstoll()

• wcstoul()

• wcstoull()

• wcsxfrm()

• wctob()

• wmemchr()

• wmemcmp()

• wmemcpy()

• wmemmove()

• wmemset()

• wprintf()

• wscanf()

14.21. <wctype.h>

The following methods and variables in <wctype.h> are supported:

• iswalnum()

• iswalpha()

• iswblank()

• iswcntrl()

• iswctype()

• iswdigit()

• iswgraph()

• iswlower()

• iswprint()

• iswpunct()

• iswspace()

• iswupper()

• iswxdigit()

• towctrans()

• towlower()

• towupper()

• wctrans()

• wctype()