FreeCalypso > hg > themwi-system-sw
view libutil/nanp_valid.c @ 267:81958b35f74d
NANP validation: allow made-up area codes of N9X form
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Mon, 13 Nov 2023 15:28:09 -0800 |
parents | b1c364729a93 |
children |
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/* * Utility functions for NANP number validation. */ is_nanp_valid_prefix(s) char *s; { /* validate NPA part */ if (s[0] < '2') return(0); if (s[1] == '1' && s[2] == '1') return(0); /* validate exchange part */ if (s[3] < '2') return(0); if (s[4] == '1' && s[5] == '1') return(0); /* all checks passed */ return(1); }