FreeCalypso > hg > themwi-nanp

annotate libnumutil/nanp_valid.c @ 1:6534965175dd

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libnumdb ported over
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 13 Dec 2023 00:53:04 +0000
parents 159dd90eeafe
children
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1 /*
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2 * Utility functions for NANP number validation.
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3 */
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4
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5 #include <stdbool.h>
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6
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7 #include <themwi/nanp/number_utils.h>
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8
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9 bool is_nanp_valid_prefix(const char *s)
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10 {
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11 /* validate NPA part */
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12 if (s[0] < '2')
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13 return false;
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14 if (s[1] == '1' && s[2] == '1')
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15 return false;
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16 /* validate exchange part */
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17 if (s[3] < '2')
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18 return false;
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19 if (s[4] == '1' && s[5] == '1')
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20 return false;
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21 /* all checks passed */
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22 return true;
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23 }