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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
50 lines
1.3 KiB
C
50 lines
1.3 KiB
C
/*
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* ISSN.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.issn.org/
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*
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* IDENTIFICATION
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* contrib/isn/ISSN.h
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*
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* 1144-875X <=> 1144875(X) <=> 1144875 <=> (977)1144875 <=> 9771144875(00) <=> 977114487500(7) <=> 977-1144-875-00-7
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*
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*
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* ISSN 1 1 4 4 8 7 5
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* Weight 8 7 6 5 4 3 2
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* Product 8 + 7 + 24 + 20 + 32 + 21 + 10 = 122
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* 122 / 11 = 11 remainder 1
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* Check digit 11 - 1 = 10 = X
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* => 1144-875X
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*
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* ISSN 9 7 7 1 1 4 4 8 7 5 0 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 + 7 + 3 + 1 + 12 + 4 + 24 + 7 + 15 + 0 + 0 = 103
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* 103 / 10 = 10 remainder 3
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* Check digit 10 - 3 = 7
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* => 977-1144875-00-7 ?? <- supplemental number (number of the week, month, etc.)
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* ^^ 00 for non-daily publications (01=Monday, 02=Tuesday, ...)
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*
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* The hyphenation is always in after the four digits of the ISSN code.
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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 ISSN_index[10][2] = {
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{0, 1},
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{0, 1},
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{0, 1},
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{0, 1},
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{0, 1},
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{0, 1},
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{0, 1},
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{0, 1},
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{0, 1},
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{0, 1},
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};
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static const char *ISSN_range[][2] = {
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{"0000-000", "9999-999"},
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{NULL, NULL}
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};
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