cert-err33-c¶
Warns on unused function return values. Many of the standard library functions return a value that indicates if the call was successful. Ignoring the returned value can cause unexpected behavior if an error has occurred. The following functions are checked:
- aligned_alloc()
- asctime_s()
- at_quick_exit()
- atexit()
- bsearch()
- bsearch_s()
- btowc()
- c16rtomb()
- c32rtomb()
- calloc()
- clock()
- cnd_broadcast()
- cnd_init()
- cnd_signal()
- cnd_timedwait()
- cnd_wait()
- ctime_s()
- fclose()
- fflush()
- fgetc()
- fgetpos()
- fgets()
- fgetwc()
- fopen()
- fopen_s()
- fprintf()
- fprintf_s()
- fputc()
- fputs()
- fputwc()
- fputws()
- fread()
- freopen()
- freopen_s()
- fscanf()
- fscanf_s()
- fseek()
- fsetpos()
- ftell()
- fwprintf()
- fwprintf_s()
- fwrite()
- fwscanf()
- fwscanf_s()
- getc()
- getchar()
- getenv()
- getenv_s()
- gets_s()
- getwc()
- getwchar()
- gmtime()
- gmtime_s()
- localtime()
- localtime_s()
- malloc()
- mbrtoc16()
- mbrtoc32()
- mbsrtowcs()
- mbsrtowcs_s()
- mbstowcs()
- mbstowcs_s()
- memchr()
- mktime()
- mtx_init()
- mtx_lock()
- mtx_timedlock()
- mtx_trylock()
- mtx_unlock()
- printf_s()
- putc()
- putwc()
- raise()
- realloc()
- remove()
- rename()
- setlocale()
- setvbuf()
- scanf()
- scanf_s()
- signal()
- snprintf()
- snprintf_s()
- sprintf()
- sprintf_s()
- sscanf()
- sscanf_s()
- strchr()
- strerror_s()
- strftime()
- strpbrk()
- strrchr()
- strstr()
- strtod()
- strtof()
- strtoimax()
- strtok()
- strtok_s()
- strtol()
- strtold()
- strtoll()
- strtoumax()
- strtoul()
- strtoull()
- strxfrm()
- swprintf()
- swprintf_s()
- swscanf()
- swscanf_s()
- thrd_create()
- thrd_detach()
- thrd_join()
- thrd_sleep()
- time()
- timespec_get()
- tmpfile()
- tmpfile_s()
- tmpnam()
- tmpnam_s()
- tss_create()
- tss_get()
- tss_set()
- ungetc()
- ungetwc()
- vfprintf()
- vfprintf_s()
- vfscanf()
- vfscanf_s()
- vfwprintf()
- vfwprintf_s()
- vfwscanf()
- vfwscanf_s()
- vprintf_s()
- vscanf()
- vscanf_s()
- vsnprintf()
- vsnprintf_s()
- vsprintf()
- vsprintf_s()
- vsscanf()
- vsscanf_s()
- vswprintf()
- vswprintf_s()
- vswscanf()
- vswscanf_s()
- vwprintf_s()
- vwscanf()
- vwscanf_s()
- wcrtomb()
- wcschr()
- wcsftime()
- wcspbrk()
- wcsrchr()
- wcsrtombs()
- wcsrtombs_s()
- wcsstr()
- wcstod()
- wcstof()
- wcstoimax()
- wcstok()
- wcstok_s()
- wcstol()
- wcstold()
- wcstoll()
- wcstombs()
- wcstombs_s()
- wcstoumax()
- wcstoul()
- wcstoull()
- wcsxfrm()
- wctob()
- wctrans()
- wctype()
- wmemchr()
- wprintf_s()
- wscanf()
- wscanf_s()
This check is an alias of check bugprone-unused-return-value with a fixed set of functions.
The check corresponds to a part of CERT C Coding Standard rule ERR33-C. Detect and handle standard library errors. The list of checked functions is taken from the rule, with following exception:
- The check can not differentiate if a function is called with
NULL
argument. Therefore the following functions are not checked:mblen
,mbrlen
,mbrtowc
,mbtowc
,wctomb
,wctomb_s