diff options
Diffstat (limited to 'contrib/isbn_issn/isbn.c')
| -rw-r--r-- | contrib/isbn_issn/isbn.c | 68 |
1 files changed, 41 insertions, 27 deletions
diff --git a/contrib/isbn_issn/isbn.c b/contrib/isbn_issn/isbn.c index ed608f3e13..5f4ac88905 100644 --- a/contrib/isbn_issn/isbn.c +++ b/contrib/isbn_issn/isbn.c @@ -1,7 +1,7 @@ /* * PostgreSQL type definitions for ISBNs. * - * $Id: isbn.c,v 1.1 1998/08/17 03:35:04 scrappy Exp $ + * $Id: isbn.c,v 1.2 1999/05/25 16:05:40 momjian Exp $ */ #include <stdio.h> @@ -16,8 +16,8 @@ typedef struct isbn { - char num[13]; - char pad[3]; + char num[13]; + char pad[3]; } isbn; /* @@ -50,13 +50,15 @@ isbn_in(char *str) char *cp; int count; - if (strlen(str) != 13) { + if (strlen(str) != 13) + { elog(ERROR, "isbn_in: invalid ISBN \"%s\"", str); return (NULL); } - if (isbn_sum(str) != 0) { + if (isbn_sum(str) != 0) + { elog(ERROR, "isbn_in: purported ISBN \"%s\" failed checksum", - str); + str); return (NULL); } @@ -84,28 +86,40 @@ isbn_in(char *str) int4 isbn_sum(char *str) { - int4 sum = 0, dashes = 0, val; - int i; - - for (i = 0; str[i] && i < 13; i++) { - switch(str[i]) { - case '-': - if (++dashes > 3) + int4 sum = 0, + dashes = 0, + val; + int i; + + for (i = 0; str[i] && i < 13; i++) + { + switch (str[i]) + { + case '-': + if (++dashes > 3) + return 12; + continue; + + case '0': + case '1': + case '2': + case '3': + case '4': + case '5': + case '6': + case '7': + case '8': + case '9': + val = str[i] - '0'; + break; + + case 'X': + case 'x': + val = 10; + break; + + default: return 12; - continue; - - case '0': case '1': case '2': case '3': - case '4': case '5': case '6': case '7': - case '8': case '9': - val = str[i] - '0'; - break; - - case 'X': case 'x': - val = 10; - break; - - default: - return 12; } sum += val * (i + 1 - dashes); |