Functions that support IEEE and ASCII encoding

The include files <stdio.h> and <stdlib.h> of the C runtime system contain some functions that support both IEEE floating-point arithmetic and ASCII encoding.

The original functions (/390, EBCDIC) are mapped to the corresponding ASCII/IEEE functions when the preprocessor defines _IEEE_SOURCE (see "Controlling the mapping of original functions to the associated IEEE variants") and _ASCII_SOURCE (see "Controlling the mapping of original functions to the associated ASCII variants") are both set to 1.

Names of the ASCII/IEEE functions

The syntax of the names of these ASCII/IEEE functions is as follows:

__ originalfunction_ ascii_ieee()

The name of the original function should be used for originalfunction.

The ASCII/IEEE variant of printf(), for example, is __printf_ascii_ieee().

C library functions for which there is an ASCII/IEEE function

atof()	ecvt()	ecvt_r()	fcvt()	fcvt_r()
fprintf()	fscanf()	gcvt()	printf()	scanf()
snprintf()	sprintf()	sscanf()	strfmon()	srtod()
srtof()	srtold()	syslog()	vfprintf()	vfscanf()
vprintf()	vscanf()	vsnprintf	vsprintf()	vsscanf()