snprintf : simple way to force . as radix?

Question

My program was not behaving correctly on one machine so I started to hunt for the bug, and I discovered that on that machine, snprintf uses a comma (,), not a . (dot) as 99% of

Answer 1

For library code, you may wish to use the POSIX 2008 uselocale function instead of setlocale. It is able to set a thread-specific locale, so that if your library code is called from a program that uses threads, it won't mess up the other threads' behavior (and/or crash the program, since setlocale is not thread-safe).

For application code, you should simply avoid ever setting the LC_NUMERIC locale category to anything but C/POSIX. The only categories you really need to set for most applications are LC_CTYPE, LC_MESSAGES, and possibly LC_COLLATE.