fscanf和换行符

Question

I have fscanf to read lines of setting from a configuration file. Those settings have strictly predefined format which looks like

name1=option1;
name2=option2;
...

so basically I do

fscanf(configuration,"%[^=]=%[^;];",name,option);

where configuration is the file stream and name and option are programming buffers.

The problem is that the name buffer contains a newline character I don't want. Is there format specifier I've missed in the "[^...]" set to skip newline character? Anyway, can it be solved through format specifier ever?

BTW: Swallowing the newline character by writting this

"%[^=]=%[^;];\n"

is not elegent I think for that the newline character could repeat more than once anywhere.

Answer 1

Just add space at the end of the format string:

"%[^=]=%[^;]; "

This will eat all whitespace characters, including new-lines.

Quotation from cplusplus.com :

Whitespace character: the function will read and ignore any whitespace characters encountered before the next non-whitespace character (whitespace characters include spaces, newline and tab characters -- see isspace). A single whitespace in the format string validates any quantity of whitespace characters extracted from the stream (including none).

Answer 2

An alternative is to use fgets() to read the entire line into a string, then use sscanf() . This has an advantage in debugging in that you can see exactly what data the function is working on.

Answer 3

This will work:

fscanf(configuration,"%[^=]=%[^;];%[^\\n]",name,option,dummy);

You will have to consume the new line character.Otherwise,the newline is left in the input stream.