mirror of https://github.com/postgres/postgres
50 lines
1.3 KiB
C
50 lines
1.3 KiB
C
/*
|
|
* ISSN.h
|
|
* PostgreSQL type definitions for ISNs (ISBN, ISMN, ISSN, EAN13, UPC)
|
|
*
|
|
* Information recompiled by Kronuz on November 12, 2004
|
|
* http://www.issn.org/
|
|
*
|
|
* IDENTIFICATION
|
|
* contrib/isn/ISSN.h
|
|
*
|
|
* 1144-875X <=> 1144875(X) <=> 1144875 <=> (977)1144875 <=> 9771144875(00) <=> 977114487500(7) <=> 977-1144-875-00-7
|
|
*
|
|
*
|
|
* ISSN 1 1 4 4 8 7 5
|
|
* Weight 8 7 6 5 4 3 2
|
|
* Product 8 + 7 + 24 + 20 + 32 + 21 + 10 = 122
|
|
* 122 / 11 = 11 remainder 1
|
|
* Check digit 11 - 1 = 10 = X
|
|
* => 1144-875X
|
|
*
|
|
* ISSN 9 7 7 1 1 4 4 8 7 5 0 0
|
|
* Weight 1 3 1 3 1 3 1 3 1 3 1 3
|
|
* Product 9 + 21 + 7 + 3 + 1 + 12 + 4 + 24 + 7 + 15 + 0 + 0 = 103
|
|
* 103 / 10 = 10 remainder 3
|
|
* Check digit 10 - 3 = 7
|
|
* => 977-1144875-00-7 ?? <- supplemental number (number of the week, month, etc.)
|
|
* ^^ 00 for non-daily publications (01=Monday, 02=Tuesday, ...)
|
|
*
|
|
* The hyphenation is always in after the four digits of the ISSN code.
|
|
*
|
|
*/
|
|
|
|
/* where the digit set begins, and how many of them are in the table */
|
|
static const unsigned ISSN_index[10][2] = {
|
|
{0, 1},
|
|
{0, 1},
|
|
{0, 1},
|
|
{0, 1},
|
|
{0, 1},
|
|
{0, 1},
|
|
{0, 1},
|
|
{0, 1},
|
|
{0, 1},
|
|
{0, 1},
|
|
};
|
|
static const char *ISSN_range[][2] = {
|
|
{"0000-000", "9999-999"},
|
|
{NULL, NULL}
|
|
};
|