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a42a039132
Use more constrained argument matching to improve forward compatibility and robustness. For example it's better that `cksum -a sha3` is _not_ equivalent to `cksum -a sha386`, so that a user specifying `-a sha3` on an older cksum would not be surprised. Also argmatch() is used when parsing tags from lines like: SHA3 (filename) = abcedf.... so it's more robust that older cksum instances to fail earlier in the parsing process, when parsing output from possible future cksum implementations that might support SHA3. * src/digest.c (algorithm_from_tag): Use argmatch_exact() to ensure we don't match abbreviated algorithms. (main): Likewise. * tests/misc/cksum-a.sh: Add a test case.