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printf conversion specifications are % followed by flags, width, precision, length modifier and conversion specifier. Is there practical limit to size of a conversion specification?
I.e. %s is 2 chars long, while %08.2f is 6 chars long. My question is, what is the length of the maximal single specification in a format string that can be created, according to C99 standard?
There is no such conversion specification of maximum length. If you think you’ve found such a spec, I can come up with one that is one char longer.
For example, consider field width and precision. The standard says they are decimal integers but does not specify their range. Therefore you can write conversion specifiers with arbitrarily large integers as field width or precision.