CC78K4 datasheet(184/523 Pages) NEC

184 / 523 page

CHAPTER 10 LIBRARY FUNCTIONS

User’s Manual U15556EJ1V0UM

184

sscanf

I/O Functions

s ................. Inputs a character string consisting of a non-blank character string.

The corresponding

argument is a pointer to an integer. 0x or 0X can be allocated at the first hexadecimal integer.

The corresponding argument must be a pointer an array that has sufficient size to

accommodate this character string and a null terminator.

The null terminator will be

automatically added.

[ .................. Inputs a character string consisting of expected character groups (called a scanset). The

corresponding argument must be a pointer to the first character of an array that has sufficient

size to accommodate this character string and a null terminator. The null terminator will be

automatically added. The format commands continue from this character up to the closing

square bracket (]). The character string (called a scanlist) enclosed in the square brackets

constitutes a scanset except when the character immediately after the opening square

bracket is a circumflex (^).

When the character is a circumflex, all the characters other than a scanlist between the

circumflex and the closing square bracket constitute a scanset. However, when a scanlist

begins with [ ] or [^], this closing square bracket is contained in the scanlist and the next

closing square brocket becomes the end of the scanlist. A hyphen (–) at other than the left or

right end of a scanlist is interpreted as the punctuation mark for hyphenation if the character

at the left of the range specifying hyphen (–) is not smaller than the right-hand character in

ASCII code value.

c ................. Inputs a character string consisting of the number of characters specified by the field width. (If

the field width specification is omitted, 1 is assumed.) The corresponding argument must be a

pointer to the first character of an array that has sufficient size to accommodate this character

string. The null terminator will not be added.

p ................. Reads an unsigned hexadecimal integer. The corresponding argument must be a pointer to

void pointer. For the large model, a hexadecimal 8-digit integer is input, and the higher two

digits are ignored.

n ................. Receives no input from the string s. The corresponding argument must be a pointer to an

integer. The number of characters that are read thus far by this function from the string “s” is

stored in the object that is pointed to by this pointer. The %n format command is not included

in the return value assignment count.

% ................ Reads a % sign. Neither conversion nor assignment takes place.

If a format specification is invalid, the format command execution fails.

If a null terminator appears in the input stream, sscanf will terminate.

If an overflow occurs in an integer conversion (with the d, i, o, u, x, or p format specifier), the higher bits will

be truncated depending on the number of bits of the data type after the conversion.

The syntax of input format commands is illustrated below.

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