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annotate libnumutil/digit_groups.c @ 15:a24f0794ab4d default tip

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INSTALL: document the new way
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 21 May 2024 00:29:21 +0000
parents 159dd90eeafe
children
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1 /*
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2 * In version 2 of ThemWi owned number database, NANP numbers are stored as 3
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3 * uint16_t words: NPA, exchange and prefix, each uint16_t encoding a group of
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4 * 3 or 4 digits of the full telephone number. This library module provides
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5 * functions for turning groups of 3 or 4 digits into uint16_t words.
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6 */
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7
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8 #include <stdint.h>
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9
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10 #include <themwi/nanp/number_utils.h>
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11
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12 uint16_t digits3_to_uint16(const char *str)
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13 {
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14 int acc;
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15
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16 acc = (str[0] - '0') * 100;
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17 acc += (str[1] - '0') * 10;
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18 acc += str[2] - '0';
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19 return acc;
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20 }
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21
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22 uint16_t digits4_to_uint16(const char *str)
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23 {
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24 int acc;
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25
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26 acc = (str[0] - '0') * 1000;
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27 acc += (str[1] - '0') * 100;
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28 acc += (str[2] - '0') * 10;
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29 acc += str[3] - '0';
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30 return acc;
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31 }