Libfmt is a port of Plan 9's formatted print library.
As a base it provides all the syntax of ANSI printf
but adds the ability for client programs to install
new print verbs. One such print verb (installed by
default) is %r, which prints the system error string.
Instead of perror("foo"), you can write fprint(2, "foo: %r\n").
This is especially nice when you write verbs to format
the data structures used by your particular program.
WWW: http://pdos.lcs.mit.edu/~rsc/software/
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