diff options
Diffstat (limited to 'src/backend/utils/mb/conv.c')
| -rw-r--r-- | src/backend/utils/mb/conv.c | 55 |
1 files changed, 50 insertions, 5 deletions
diff --git a/src/backend/utils/mb/conv.c b/src/backend/utils/mb/conv.c index f957b6efd32..9757dbabec5 100644 --- a/src/backend/utils/mb/conv.c +++ b/src/backend/utils/mb/conv.c @@ -15,6 +15,51 @@ /* + * local2local: a generic single byte charset encoding + * conversion between two ASCII-superset encodings. + * + * l points to the source string of length len + * p is the output area (must be large enough!) + * src_encoding is the PG identifier for the source encoding + * dest_encoding is the PG identifier for the target encoding + * tab holds conversion entries for the source charset + * starting from 128 (0x80). each entry in the table holds the corresponding + * code point for the target charset, or 0 if there is no equivalent code. + */ +void +local2local(const unsigned char *l, + unsigned char *p, + int len, + int src_encoding, + int dest_encoding, + const unsigned char *tab) +{ + unsigned char c1, + c2; + + while (len > 0) + { + c1 = *l; + if (c1 == 0) + report_invalid_encoding(src_encoding, (const char *) l, len); + if (!IS_HIGHBIT_SET(c1)) + *p++ = c1; + else + { + c2 = tab[c1 - HIGHBIT]; + if (c2) + *p++ = c2; + else + report_untranslatable_char(src_encoding, dest_encoding, + (const char *) l, len); + } + l++; + len--; + } + *p = '\0'; +} + +/* * LATINn ---> MIC when the charset's local codes map directly to MIC * * l points to the source string of length len @@ -141,8 +186,8 @@ pg_mic2ascii(const unsigned char *mic, unsigned char *p, int len) * lc is the mule character set id for the local encoding * encoding is the PG identifier for the local encoding * tab holds conversion entries for the local charset - * starting from 128 (0x80). each entry in the table - * holds the corresponding code point for the mule internal code. + * starting from 128 (0x80). each entry in the table holds the corresponding + * code point for the mule encoding, or 0 if there is no equivalent code. */ void latin2mic_with_table(const unsigned char *l, @@ -188,9 +233,9 @@ latin2mic_with_table(const unsigned char *l, * p is the output area (must be large enough!) * lc is the mule character set id for the local encoding * encoding is the PG identifier for the local encoding - * tab holds conversion entries for the mule internal code's - * second byte, starting from 128 (0x80). each entry in the table - * holds the corresponding code point for the local charset. + * tab holds conversion entries for the mule internal code's second byte, + * starting from 128 (0x80). each entry in the table holds the corresponding + * code point for the local charset, or 0 if there is no equivalent code. */ void mic2latin_with_table(const unsigned char *mic, |