Defined in header <string.h> void* memmove( void* dest, const void* src, size_t count ); (1) errno_t memmove_s(void *dest, rsize_t destsz, const void *src, rsize_t count); (2) (since C11) 1) Copies count characters from the object pointed to by src to the object pointed to by dest. Both objects are interpreted as arrays of unsigned char. The objects may overlap: copying takes place as if the characters were copied to a temporary character array and then the character

Each individual type in the C type system has several qualified versions of that type, corresponding to one, two, or all three of the const, volatile, and, for pointers to object types, restrict qualifiers. This page describes the effects of the const qualifier. Objects declared with const-qualified types may be placed in read-only memory by the compiler, and if the address of a const object is never taken in a program, it may not be stored at all. const semantics apply to lvalue expressions on

Defined in header <threads.h> int cnd_signal( cnd_t *cond ); (since C11) Unblocks one thread that currently waits on condition variable pointed to by cond. If no threads are blocked, does nothing and returns thrd_success. Parameters cond - pointer to a condition variable Return value thrd_success if successful, thrd_error otherwise. References C11 standard (ISO/IEC 9899:2011): 7.26.3.4 The cnd_signal function (p: 379) See also cnd_broadcast (C11)

Defined in header <time.h> size_t strftime( char * str, size_t count, const char * format, const struct tm * time ); (until C99) size_t strftime( char *restrict str, size_t count, const char *restrict format, const struct tm *restrict time ); (since C99) Converts the date and time information from a given calendar time time to a null-terminated multibyte character string str according to format string format.

Defined in header <ctype.h> int isalpha( int ch ); Checks if the given character is an alphabetic character, i.e. either an uppercase letter (ABCDEFGHIJKLMNOPQRSTUVWXYZ), or a lowercase letter (abcdefghijklmnopqrstuvwxyz). In locales other than "C", an alphabetic character is a character for which isupper() or islower() returns true or any other character considered alphabetic by the locale. In any case, iscntrl(), isdigit(), ispunct() and isspace() will return false for th

Defined in header <float.h> #define FLT_EVAL_METHOD /* implementation defined */ (since C99) Specifies the precision in which all floating-point arithmetic operations other than assignment and cast are done. Value Explanation negative values except -1 implementation-defined behavior -1 the default precision is not known 0 all operations and constants evaluate in the range and precision of the type used. Additionally, float_t and double_t are equivalent to flo

Defined in header <threads.h> int thrd_create( thrd_t *thr, thrd_start_t func, void *arg ); (since C11) Creates a new thread executing the function func. The function is invoked as func(arg). If successful, the object pointed to by thr is set to the identifier of the new thread. The completion of this function synchronizes-with the beginning of the thread. Parameters thr - pointer to memory location to put the identifier of the new thread func - function to ex

Defined in header <threads.h> _Noreturn void thrd_exit( int res ); (since C11) First, for every thread-specific storage key which was created with a non-null destructor and for which the associated value is non-null (see tss_create), thrd_exit sets the value associated with the key to NULL and then invokes the destructor with the previous value of the key. The order in which the destructors are invoked is unspecified. If, after this, there remain keys with both non-null des

Defined in header <math.h> float copysignf( float x, float y ); (1) (since C99) double copysign( double x, double y ); (2) (since C99) long double copysignl( long double x, long double y ); (3) (since C99) Defined in header <tgmath.h> #define copysign(from, to) (7) (since C99) 1-3) Composes a floating point value with the magnitude of x and the sign of y. 4) Type-generic macro: If any argument has type long double, copysignl is c

If the macro constant __STDC_NO_COMPLEX__ is defined by the implementation, the complex types, the header <complex.h> and all of the names listed here are not provided. (since C11) The C programming language, as of C99, supports complex number math with the three built-in types double _Complex, float _Complex, and long double _Complex (see _Complex). When the header <complex.h> is included, the three complex number types are also accessible as double complex, float complex, long