TODO item:
* Make n of CHAR(n)/VARCHAR(n) the number of letters, not bytes
This commit is contained in:
Tatsuo Ishii
parent
b08e86d557
commit
1032445e5d
@ -8,7 +8,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/utils/adt/varchar.c,v 1.80 2001/06/09 23:21:55 petere Exp $
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* $Header: /cvsroot/pgsql/src/backend/utils/adt/varchar.c,v 1.81 2001/07/15 11:07:37 ishii Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -73,26 +73,48 @@ bpcharin(PG_FUNCTION_ARGS)
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char *r;
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size_t len, maxlen;
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int i;
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#ifdef MULTIBYTE
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int charlen; /* number of charcters in the input string */
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#endif
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len = strlen(s);
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#ifdef MULTIBYTE
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charlen = pg_mbstrlen(s);
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#endif
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/* If typmod is -1 (or invalid), use the actual string length */
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if (atttypmod < (int32) VARHDRSZ)
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#ifdef MULTIBYTE
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maxlen = charlen;
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#else
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maxlen = len;
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#endif
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else
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maxlen = atttypmod - VARHDRSZ;
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#ifdef MULTIBYTE
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if (charlen > maxlen)
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#else
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if (len > maxlen)
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#endif
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{
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/* Verify that extra characters are spaces, and clip them off */
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#ifdef MULTIBYTE
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size_t mbmaxlen = pg_mbcliplen(s, len, maxlen);
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size_t mbmaxlen = pg_mbcharcliplen(s, len, maxlen);
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/*
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* at this point, len is the actual BYTE length of the
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* input string, maxlen is the max number of
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* CHARACTERS allowed for this bpchar type.
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*/
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if (strspn(s + mbmaxlen, " ") == len - mbmaxlen)
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len = mbmaxlen;
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else
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elog(ERROR, "value too long for type character(%d)", maxlen);
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Assert(len <= maxlen);
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/*
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* XXX: at this point, maxlen is the necessary byte
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* length, not the number of CHARACTERS!
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*/
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maxlen = len;
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#else
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if (strspn(s + maxlen, " ") == len - maxlen)
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len = maxlen;
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@ -100,6 +122,16 @@ bpcharin(PG_FUNCTION_ARGS)
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elog(ERROR, "value too long for type character(%d)", maxlen);
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#endif
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}
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#ifdef MULTIBYTE
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else
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{
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/*
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* XXX: at this point, maxlen is the necessary byte
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* length, not the number of CHARACTERS!
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*/
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maxlen = len + (maxlen - charlen);
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}
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#endif
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result = palloc(maxlen + VARHDRSZ);
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VARATT_SIZEP(result) = maxlen + VARHDRSZ;
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@ -158,19 +190,29 @@ bpchar(PG_FUNCTION_ARGS)
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char *r;
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char *s;
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int i;
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#ifdef MULTIBYTE
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int charlen; /* number of charcters in the input string
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+ VARHDRSZ*/
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#endif
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len = VARSIZE(source);
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#ifdef MULTIBYTE
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charlen = pg_mbstrlen_with_len(VARDATA(source), len - VARHDRSZ) + VARHDRSZ;
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#endif
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/* No work if typmod is invalid or supplied data matches it already */
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if (maxlen < (int32) VARHDRSZ || len == maxlen)
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PG_RETURN_BPCHAR_P(source);
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#ifdef MULTIBYTE
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if (charlen > maxlen)
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#else
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if (len > maxlen)
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#endif
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{
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/* Verify that extra characters are spaces, and clip them off */
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#ifdef MULTIBYTE
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size_t maxmblen;
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maxmblen = pg_mbcliplen(VARDATA(source), len - VARHDRSZ,
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maxmblen = pg_mbcharcliplen(VARDATA(source), len - VARHDRSZ,
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maxlen - VARHDRSZ) + VARHDRSZ;
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for (i = maxmblen - VARHDRSZ; i < len - VARHDRSZ; i++)
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@ -179,7 +221,11 @@ bpchar(PG_FUNCTION_ARGS)
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maxlen - VARHDRSZ);
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len = maxmblen;
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Assert(len <= maxlen);
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/*
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* XXX: at this point, maxlen is the necessary byte
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* length+VARHDRSZ, not the number of CHARACTERS!
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*/
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maxlen = len;
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#else
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for (i = maxlen - VARHDRSZ; i < len - VARHDRSZ; i++)
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if (*(VARDATA(source) + i) != ' ')
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@ -189,6 +235,16 @@ bpchar(PG_FUNCTION_ARGS)
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len = maxlen;
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#endif
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}
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#ifdef MULTIBYTE
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else
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{
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/*
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* XXX: at this point, maxlen is the necessary byte
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* length+VARHDRSZ, not the number of CHARACTERS!
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*/
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maxlen = len + (maxlen - charlen);
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}
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#endif
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s = VARDATA(source);
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@ -333,9 +389,12 @@ name_bpchar(PG_FUNCTION_ARGS)
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* Convert a C string to VARCHAR internal representation. atttypmod
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* is the declared length of the type plus VARHDRSZ.
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*
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* If the C string is too long, raise an error, unless the extra
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* characters are spaces, in which case they're truncated. (per SQL)
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*/
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* Note that if MULTIBYTE is enabled, atttypmod is regarded as the
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* number of characters, rather than number of bytes.
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*
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* If the C string is too long,
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* raise an error, unless the extra characters are spaces, in which
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* case they're truncated. (per SQL) */
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Datum
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varcharin(PG_FUNCTION_ARGS)
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{
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@ -354,7 +413,7 @@ varcharin(PG_FUNCTION_ARGS)
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{
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/* Verify that extra characters are spaces, and clip them off */
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#ifdef MULTIBYTE
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size_t mbmaxlen = pg_mbcliplen(s, len, maxlen);
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size_t mbmaxlen = pg_mbcharcliplen(s, len, maxlen);
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if (strspn(s + mbmaxlen, " ") == len - mbmaxlen)
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len = mbmaxlen;
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@ -428,7 +487,7 @@ varchar(PG_FUNCTION_ARGS)
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size_t maxmblen;
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/* truncate multi-byte string preserving multi-byte boundary */
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maxmblen = pg_mbcliplen(VARDATA(source), len - VARHDRSZ,
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maxmblen = pg_mbcharcliplen(VARDATA(source), len - VARHDRSZ,
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maxlen - VARHDRSZ) + VARHDRSZ;
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for (i = maxmblen - VARHDRSZ; i < len - VARHDRSZ; i++)
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@ -515,22 +574,9 @@ bpcharlen(PG_FUNCTION_ARGS)
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BpChar *arg = PG_GETARG_BPCHAR_P(0);
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#ifdef MULTIBYTE
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unsigned char *s;
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int len,
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l,
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wl;
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l = VARSIZE(arg) - VARHDRSZ;
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len = 0;
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s = VARDATA(arg);
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while (l > 0)
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{
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wl = pg_mblen(s);
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l -= wl;
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s += wl;
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len++;
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}
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PG_RETURN_INT32(len);
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PG_RETURN_INT32(
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pg_mbstrlen_with_len(VARDATA(arg), VARSIZE(arg) - VARHDRSZ)
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);
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#else
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PG_RETURN_INT32(VARSIZE(arg) - VARHDRSZ);
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#endif
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@ -736,22 +782,9 @@ varcharlen(PG_FUNCTION_ARGS)
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VarChar *arg = PG_GETARG_VARCHAR_P(0);
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#ifdef MULTIBYTE
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unsigned char *s;
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int len,
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l,
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wl;
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len = 0;
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s = VARDATA(arg);
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l = VARSIZE(arg) - VARHDRSZ;
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while (l > 0)
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{
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wl = pg_mblen(s);
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l -= wl;
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s += wl;
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len++;
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}
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PG_RETURN_INT32(len);
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PG_RETURN_INT32(
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pg_mbstrlen_with_len(VARDATA(arg), VARSIZE(arg) - VARHDRSZ)
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);
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#else
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PG_RETURN_INT32(VARSIZE(arg) - VARHDRSZ);
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#endif
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@ -3,7 +3,7 @@
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* client encoding and server internal encoding.
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* (currently mule internal code (mic) is used)
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* Tatsuo Ishii
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* $Id: mbutils.c,v 1.17 2001/04/16 02:42:01 tgl Exp $
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* $Id: mbutils.c,v 1.18 2001/07/15 11:07:36 ishii Exp $
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*/
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#include "postgres.h"
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@ -241,9 +241,9 @@ pg_mbstrlen_with_len(const unsigned char *mbstr, int limit)
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}
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/*
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* returns the length of a multi-byte string
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* returns the byte length of a multi-byte string
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* (not necessarily NULL terminated)
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* that is not longer than limit.
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* that is no longer than limit.
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* this function does not break multi-byte word boundary.
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*/
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int
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@ -267,8 +267,30 @@ pg_mbcliplen(const unsigned char *mbstr, int len, int limit)
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}
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/*
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* functions for utils/init
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*/
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* Similar to pg_mbcliplen but the limit parameter specifies the
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* character length, not the byte length. */
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int
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pg_mbcharcliplen(const unsigned char *mbstr, int len, int limit)
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{
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int clen = 0;
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int nch = 0;
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int l;
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while (len > 0 && *mbstr)
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{
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l = pg_mblen(mbstr);
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nch++;
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if (nch > limit)
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break;
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clen += l;
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len -= l;
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mbstr += l;
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}
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return (clen);
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}
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/*
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* functions for utils/init */
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static int DatabaseEncoding = MULTIBYTE;
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void
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@ -1,4 +1,4 @@
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/* $Id: pg_wchar.h,v 1.26 2001/05/03 21:38:44 momjian Exp $ */
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/* $Id: pg_wchar.h,v 1.27 2001/07/15 11:07:37 ishii Exp $ */
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#ifndef PG_WCHAR_H
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#define PG_WCHAR_H
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@ -136,6 +136,7 @@ extern int pg_mic_mblen(const unsigned char *);
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extern int pg_mbstrlen(const unsigned char *);
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extern int pg_mbstrlen_with_len(const unsigned char *, int);
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extern int pg_mbcliplen(const unsigned char *, int, int);
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extern int pg_mbcharcliplen(const unsigned char *, int, int);
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extern pg_encoding_conv_tbl *pg_get_encent_by_encoding(int);
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extern int pg_set_client_encoding(int);
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extern int pg_get_client_encoding(void);
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