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annotate libnumdb2/check_short.c @ 275:def9f6e4f49e default tip

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doc/Use-outside-USA: Fake-NANP-numbers article is here
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 27 Nov 2023 21:49:19 -0800
parents 38cac1cbe010
children
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1d590563e64b libnumdb: implement short number lookup
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1 /*
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2 * The library function implemented in this module looks up 4-digit short
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3 * dialing numbers in ThemWi number db to determine their disposition.
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4 */
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5
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6 #include <stdio.h>
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7 #include <stdint.h>
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8 #include <stdlib.h>
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9 #include "../include/number_db_v2.h"
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11 extern struct numdb_file_hdr numdb_hdr;
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12 extern struct short_number_rec *numdb_short_numbers;
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13
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14 static int
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15 compare_short_num(p1, p2)
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16 uint16_t *p1, *p2;
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17 {
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18 if (*p1 < *p2)
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19 return(-1);
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20 if (*p1 > *p2)
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21 return(1);
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22 return(0);
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23 }
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24
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25 struct short_number_rec *
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26 numdb_lookup_short(numstr)
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27 char *numstr;
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28 {
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29 uint16_t key;
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31 if (!numdb_short_numbers || !numdb_hdr.short_number_count)
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32 return(0);
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33 key = digits4_to_uint16(numstr);
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34 return bsearch(&key, numdb_short_numbers, numdb_hdr.short_number_count,
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35 sizeof(struct short_number_rec), compare_short_num);
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36 }