Zilog ZUSBOPTS Bedienungsanleitung PDF herunterladen (Seite 429)

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101

UM017105-0511 Standard Header Files

Zilog Developer Studio II – ZNEO™

User Manual

401

The following additional nearest integer functions are provided:

Nonlocal Jumps <setjmp.h>

The <setjmp.h> header declares two functions and one type for bypassing the normal

function call and return discipline.

Type

Functions

Variable Arguments <stdarg.h>

The <stdarg.h> header declares a type and a function and defines two macros for

advancing through a list of arguments whose number and types are not known to the called

function when it is translated.

A function can be called with a variable number of arguments of varying types. A Func-

tion Definitions parameter list contains one or more parameters. The rightmost parameter

plays a special role in the access mechanism and is designated parmN in this description.

Type

float ceilf(float x); Finds integer ceiling of x.

float fabsf(float x); Finds absolute value of x.

float floorf(float x); Finds largest integer less than or equal to x.

float fmodf(float x,float y); Finds floating-point remainder of x/y.

jmp_buf An array type suitable for holding the information required to restore a

calling environment.

int setjmp(jmp_buf env); Saves a stack environment.

void longjmp(jmp_buf env, int val); Restores a saved stack environ-

ment.

va_list An array type suitable for holding information required by the macro

va_arg and the function va_end. The called function declares a variable

(referred to as ap in this section) having type va_list. The variable ap can

be passed as an argument to another function.

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