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Moar string stuff: snprintf(3)#796

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Commits on Dec 4, 2023

• lib/, src/: snprintf(3) already terminates strings with NUL

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• lib/string/sprintf.h: Add SNPRINTF() macro

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• src/login.c: Group preprocessor conditionals

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• lib/, src/: Align variable definitions

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• lib/, src/: Use SNPRINTF() instead of its pattern

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• lib/string/sprintf.[ch]: Add x[v]snprintf() and XSNPRINTF()

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• lib/, src/: Use XSNPRINTF() instead of assert(SNPRINTF())

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• lib/string/sprintf.[ch]: Add [v]snprintf_()

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• lib/: Use snprintf_() where appropriate

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• tests/unit/test_snprintf.c: Test SNPRINTF()

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