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720b0eaae9
These probably should have been static all along, it was only forgotten out of sloppiness. Reviewed-by: Andres Freund <andres@anarazel.de> Discussion: https://www.postgresql.org/message-id/flat/e0a62134-83da-4ba4-8cdb-ceb0111c95ce@eisentraut.org
53 lines
1.3 KiB
C
53 lines
1.3 KiB
C
/*
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* ISMN.h
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* PostgreSQL type definitions for ISNs (ISBN, ISMN, ISSN, EAN13, UPC)
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*
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* Information recompiled by Kronuz on November 12, 2004
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* http://www.ismn-international.org
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*
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* IDENTIFICATION
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* contrib/isn/ISMN.h
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*
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* M-3452-4680-5 <=> (0)-3452-4680-5 <=> 0345246805 <=> 9790345246805 <=> 979-0-3452-4680-5
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*
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* (M counts as 3)
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* ISMN M 3 4 5 2 4 6 8 0
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* Weight 3 1 3 1 3 1 3 1 3
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* Product 9 + 3 + 12 + 5 + 6 + 4 + 18 + 8 + 0 = 65
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* 65 / 10 = 6 remainder 5
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* Check digit 10 - 5 = 5
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* => M-3452-4680-5
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*
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* ISMN 9 7 9 0 3 4 5 2 4 6 8 0
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* Weight 1 3 1 3 1 3 1 3 1 3 1 3
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* Product 9 + 21 + 9 + 0 + 3 + 12 + 5 + 6 + 4 + 18 + 8 + 0 = 95
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* 95 / 10 = 9 remainder 5
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* Check digit 10 - 5 = 5
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* => 979-0-3452-4680-5
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*
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* Since mod10(9*1 + 7*3 + 9*1 + 0*3) = mod10(M*3) = mod10(3*3) = 9; the check digit remains the same.
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*
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*/
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/* where the digit set begins, and how many of them are in the table */
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static const unsigned ISMN_index[10][2] = {
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{0, 5},
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{5, 0},
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{5, 0},
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{5, 0},
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{5, 0},
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{5, 0},
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{5, 0},
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{5, 0},
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{5, 0},
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{5, 0},
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};
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static const char *ISMN_range[][2] = {
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{"0-000", "0-099"},
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{"0-1000", "0-3999"},
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{"0-40000", "0-69999"},
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{"0-700000", "0-899999"},
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{"0-9000000", "0-9999999"},
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{NULL, NULL}
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};
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