## How to printf a length-delimited string

Thursday, November 15, 2012.

You often see code like this:

TODO insert example of copying length-delimited string to null-delimited string just for a printf

The extra copying isn’t necessary, since printf(3) can format length-delimited strings too.

I always end up looking this one up in the printf(3) man page.

 The precision

An optional precision, in the form of a period ('.') followed by an optional decimal digit string. Instead of a decimal digit string one may write "*" or "*m\$" (for some decimal integer m) to specify that the precision is given in the next argument, or in the m-th argument, respectively, which must be of type int. This gives ... the maximum number of characters to be printed from a string for s and S conversions.
Posted by Alan on Thursday, November 15, 2012. (Discuss)