util

Download util-20240909.tar.gz (13 kb)

This is a collection of single-file C programs, all with the following useful properties:

Public domain.
Only require the C89 standard library, and only a subset of that. (See util.h for list of excluded functions)
No dynamic allocations used.
No floating-point used.
No 64-bit types used.

Currently the following well-known UNIX utilities are included:

basename
cat
dirname
echo
false
true
yes

Also included are my own inventions:

cxd - Hex dump colorizer
fmt - Text formatter (minimal variant of UNIX fmt)
segoff - segment/offset calculator (for Intel 80x86 CPUs)
u2cp437 - Convert text from UTF-8 to IBM PC code page 437
xd - Hex dump and reverse hex dump utility

The included header files are all self-contained code snippets:

numtab.h - Lookup table for fast conversion of ASCII hex digits
strtou32.h - Convert string to 32-bit unsigned integer
u16.h - Provides 16-bit unsigned integer on C89
u32.h - Provides 32-bit unsigned integer on C89
u8.h - Provides 8-bit unsigned integer on C89
util.h - Miscellaneous macros