- It's typically faster.
POSIX says that only '0' through '9' are digits. Prefer ISDIGIT to
ISDIGIT unless it's important to use the locale's definition
- of `digit' even when the host does not conform to POSIX. */
+ of "digit" even when the host does not conform to POSIX. */
#define ISDIGIT(c) ((unsigned int) (c) - '0' <= 9)
/* The extension added to file names to produce a simple (as opposed