FreeCalypso > hg > themwi-nanp

annotate libnumdb/check_nanp.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 6534965175dd
children
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1 /*
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2 * The library function implemented in this module consults ThemWi number db
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3 * to see if a given NANP number is owned by us or not.
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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
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10 #include <themwi/nanp/number_db_v2.h>
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11 #include <themwi/nanp/number_lookup.h>
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12 #include <themwi/nanp/number_utils.h>
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13
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14 extern struct numdb_file_hdr numdb_hdr;
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15 extern struct owned_number_rec *numdb_owned_numbers;
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16
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17 static int compare_owned_num(const void *p1v, const void *p2v)
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18 {
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19 const uint16_t *p1 = p1v, *p2 = p2v;
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20
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21 if (p1[0] < p2[0])
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22 return(-1);
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23 if (p1[0] > p2[0])
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24 return(1);
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25 if (p1[1] < p2[1])
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26 return(-1);
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27 if (p1[1] > p2[1])
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28 return(1);
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29 if (p1[2] < p2[2])
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30 return(-1);
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31 if (p1[2] > p2[2])
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32 return(1);
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33 return(0);
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34 }
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35
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36 const struct owned_number_rec *numdb_lookup_nanp(const char *numstr)
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37 {
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38 uint16_t key[3];
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39
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40 if (!numdb_owned_numbers || !numdb_hdr.owned_number_count)
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41 return(0);
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42 key[0] = digits3_to_uint16(numstr);
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43 key[1] = digits3_to_uint16(numstr + 3);
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44 key[2] = digits4_to_uint16(numstr + 6);
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45 return bsearch(key, numdb_owned_numbers, numdb_hdr.owned_number_count,
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46 sizeof(struct owned_number_rec), compare_owned_num);
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47 }