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Commit1032445

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committed
TODO item:
* Make n of CHAR(n)/VARCHAR(n) the number of letters, not bytes
1 parentb08e86d commit1032445

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3 files changed

+106
-50
lines changed

3 files changed

+106
-50
lines changed

‎src/backend/utils/adt/varchar.c‎

Lines changed: 77 additions & 44 deletions
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
*
99
*
1010
* IDENTIFICATION
11-
* $Header: /cvsroot/pgsql/src/backend/utils/adt/varchar.c,v 1.80 2001/06/09 23:21:55 petere Exp $
11+
* $Header: /cvsroot/pgsql/src/backend/utils/adt/varchar.c,v 1.81 2001/07/15 11:07:37 ishii Exp $
1212
*
1313
*-------------------------------------------------------------------------
1414
*/
@@ -73,33 +73,65 @@ bpcharin(PG_FUNCTION_ARGS)
7373
char*r;
7474
size_tlen,maxlen;
7575
inti;
76+
#ifdefMULTIBYTE
77+
intcharlen;/* number of charcters in the input string */
78+
#endif
7679

7780
len=strlen(s);
81+
#ifdefMULTIBYTE
82+
charlen=pg_mbstrlen(s);
83+
#endif
7884

7985
/* If typmod is -1 (or invalid), use the actual string length */
8086
if (atttypmod< (int32)VARHDRSZ)
87+
#ifdefMULTIBYTE
88+
maxlen=charlen;
89+
#else
8190
maxlen=len;
91+
#endif
8292
else
8393
maxlen=atttypmod-VARHDRSZ;
8494

95+
#ifdefMULTIBYTE
96+
if (charlen>maxlen)
97+
#else
8598
if (len>maxlen)
99+
#endif
86100
{
87101
/* Verify that extra characters are spaces, and clip them off */
88102
#ifdefMULTIBYTE
89-
size_tmbmaxlen=pg_mbcliplen(s,len,maxlen);
90-
103+
size_tmbmaxlen=pg_mbcharcliplen(s,len,maxlen);
104+
/*
105+
* at this point, len is the actual BYTE length of the
106+
* input string, maxlen is the max number of
107+
* CHARACTERS allowed for this bpchar type.
108+
*/
91109
if (strspn(s+mbmaxlen," ")==len-mbmaxlen)
92110
len=mbmaxlen;
93111
else
94112
elog(ERROR,"value too long for type character(%d)",maxlen);
95-
Assert(len <=maxlen);
113+
/*
114+
* XXX: at this point, maxlen is the necessary byte
115+
* length, not the number of CHARACTERS!
116+
*/
117+
maxlen=len;
96118
#else
97119
if (strspn(s+maxlen," ")==len-maxlen)
98120
len=maxlen;
99121
else
100122
elog(ERROR,"value too long for type character(%d)",maxlen);
101123
#endif
102124
}
125+
#ifdefMULTIBYTE
126+
else
127+
{
128+
/*
129+
* XXX: at this point, maxlen is the necessary byte
130+
* length, not the number of CHARACTERS!
131+
*/
132+
maxlen=len+ (maxlen-charlen);
133+
}
134+
#endif
103135

104136
result=palloc(maxlen+VARHDRSZ);
105137
VARATT_SIZEP(result)=maxlen+VARHDRSZ;
@@ -158,19 +190,29 @@ bpchar(PG_FUNCTION_ARGS)
158190
char*r;
159191
char*s;
160192
inti;
193+
#ifdefMULTIBYTE
194+
intcharlen;/* number of charcters in the input string
195+
+ VARHDRSZ*/
196+
#endif
161197

162198
len=VARSIZE(source);
199+
#ifdefMULTIBYTE
200+
charlen=pg_mbstrlen_with_len(VARDATA(source),len-VARHDRSZ)+VARHDRSZ;
201+
#endif
163202
/* No work if typmod is invalid or supplied data matches it already */
164203
if (maxlen< (int32)VARHDRSZ||len==maxlen)
165204
PG_RETURN_BPCHAR_P(source);
166-
205+
#ifdefMULTIBYTE
206+
if (charlen>maxlen)
207+
#else
167208
if (len>maxlen)
209+
#endif
168210
{
169211
/* Verify that extra characters are spaces, and clip them off */
170212
#ifdefMULTIBYTE
171213
size_tmaxmblen;
172214

173-
maxmblen=pg_mbcliplen(VARDATA(source),len-VARHDRSZ,
215+
maxmblen=pg_mbcharcliplen(VARDATA(source),len-VARHDRSZ,
174216
maxlen-VARHDRSZ)+VARHDRSZ;
175217

176218
for (i=maxmblen-VARHDRSZ;i<len-VARHDRSZ;i++)
@@ -179,7 +221,11 @@ bpchar(PG_FUNCTION_ARGS)
179221
maxlen-VARHDRSZ);
180222

181223
len=maxmblen;
182-
Assert(len <=maxlen);
224+
/*
225+
* XXX: at this point, maxlen is the necessary byte
226+
* length+VARHDRSZ, not the number of CHARACTERS!
227+
*/
228+
maxlen=len;
183229
#else
184230
for (i=maxlen-VARHDRSZ;i<len-VARHDRSZ;i++)
185231
if (*(VARDATA(source)+i)!=' ')
@@ -189,6 +235,16 @@ bpchar(PG_FUNCTION_ARGS)
189235
len=maxlen;
190236
#endif
191237
}
238+
#ifdefMULTIBYTE
239+
else
240+
{
241+
/*
242+
* XXX: at this point, maxlen is the necessary byte
243+
* length+VARHDRSZ, not the number of CHARACTERS!
244+
*/
245+
maxlen=len+ (maxlen-charlen);
246+
}
247+
#endif
192248

193249
s=VARDATA(source);
194250

@@ -333,9 +389,12 @@ name_bpchar(PG_FUNCTION_ARGS)
333389
* Convert a C string to VARCHAR internal representation. atttypmod
334390
* is the declared length of the type plus VARHDRSZ.
335391
*
336-
* If the C string is too long, raise an error, unless the extra
337-
* characters are spaces, in which case they're truncated. (per SQL)
338-
*/
392+
* Note that if MULTIBYTE is enabled, atttypmod is regarded as the
393+
* number of characters, rather than number of bytes.
394+
*
395+
* If the C string is too long,
396+
* raise an error, unless the extra characters are spaces, in which
397+
* case they're truncated. (per SQL) */
339398
Datum
340399
varcharin(PG_FUNCTION_ARGS)
341400
{
@@ -354,7 +413,7 @@ varcharin(PG_FUNCTION_ARGS)
354413
{
355414
/* Verify that extra characters are spaces, and clip them off */
356415
#ifdefMULTIBYTE
357-
size_tmbmaxlen=pg_mbcliplen(s,len,maxlen);
416+
size_tmbmaxlen=pg_mbcharcliplen(s,len,maxlen);
358417

359418
if (strspn(s+mbmaxlen," ")==len-mbmaxlen)
360419
len=mbmaxlen;
@@ -428,7 +487,7 @@ varchar(PG_FUNCTION_ARGS)
428487
size_tmaxmblen;
429488

430489
/* truncate multi-byte string preserving multi-byte boundary */
431-
maxmblen=pg_mbcliplen(VARDATA(source),len-VARHDRSZ,
490+
maxmblen=pg_mbcharcliplen(VARDATA(source),len-VARHDRSZ,
432491
maxlen-VARHDRSZ)+VARHDRSZ;
433492

434493
for (i=maxmblen-VARHDRSZ;i<len-VARHDRSZ;i++)
@@ -515,22 +574,9 @@ bpcharlen(PG_FUNCTION_ARGS)
515574
BpChar*arg=PG_GETARG_BPCHAR_P(0);
516575

517576
#ifdefMULTIBYTE
518-
unsignedchar*s;
519-
intlen,
520-
l,
521-
wl;
522-
523-
l=VARSIZE(arg)-VARHDRSZ;
524-
len=0;
525-
s=VARDATA(arg);
526-
while (l>0)
527-
{
528-
wl=pg_mblen(s);
529-
l-=wl;
530-
s+=wl;
531-
len++;
532-
}
533-
PG_RETURN_INT32(len);
577+
PG_RETURN_INT32(
578+
pg_mbstrlen_with_len(VARDATA(arg),VARSIZE(arg)-VARHDRSZ)
579+
);
534580
#else
535581
PG_RETURN_INT32(VARSIZE(arg)-VARHDRSZ);
536582
#endif
@@ -736,22 +782,9 @@ varcharlen(PG_FUNCTION_ARGS)
736782
VarChar*arg=PG_GETARG_VARCHAR_P(0);
737783

738784
#ifdefMULTIBYTE
739-
unsignedchar*s;
740-
intlen,
741-
l,
742-
wl;
743-
744-
len=0;
745-
s=VARDATA(arg);
746-
l=VARSIZE(arg)-VARHDRSZ;
747-
while (l>0)
748-
{
749-
wl=pg_mblen(s);
750-
l-=wl;
751-
s+=wl;
752-
len++;
753-
}
754-
PG_RETURN_INT32(len);
785+
PG_RETURN_INT32(
786+
pg_mbstrlen_with_len(VARDATA(arg),VARSIZE(arg)-VARHDRSZ)
787+
);
755788
#else
756789
PG_RETURN_INT32(VARSIZE(arg)-VARHDRSZ);
757790
#endif

‎src/backend/utils/mb/mbutils.c‎

Lines changed: 27 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -3,7 +3,7 @@
33
* client encoding and server internal encoding.
44
* (currently mule internal code (mic) is used)
55
* Tatsuo Ishii
6-
* $Id: mbutils.c,v 1.17 2001/04/16 02:42:01 tgl Exp $
6+
* $Id: mbutils.c,v 1.18 2001/07/15 11:07:36 ishii Exp $
77
*/
88
#include"postgres.h"
99

@@ -241,9 +241,9 @@ pg_mbstrlen_with_len(const unsigned char *mbstr, int limit)
241241
}
242242

243243
/*
244-
* returns the length of a multi-byte string
244+
* returns thebytelength of a multi-byte string
245245
* (not necessarily NULL terminated)
246-
* that isnot longer than limit.
246+
* that isno longer than limit.
247247
* this function does not break multi-byte word boundary.
248248
*/
249249
int
@@ -267,8 +267,30 @@ pg_mbcliplen(const unsigned char *mbstr, int len, int limit)
267267
}
268268

269269
/*
270-
* functions for utils/init
271-
*/
270+
* Similar to pg_mbcliplen but the limit parameter specifies the
271+
* character length, not the byte length. */
272+
int
273+
pg_mbcharcliplen(constunsignedchar*mbstr,intlen,intlimit)
274+
{
275+
intclen=0;
276+
intnch=0;
277+
intl;
278+
279+
while (len>0&&*mbstr)
280+
{
281+
l=pg_mblen(mbstr);
282+
nch++;
283+
if (nch>limit)
284+
break;
285+
clen+=l;
286+
len-=l;
287+
mbstr+=l;
288+
}
289+
return (clen);
290+
}
291+
292+
/*
293+
* functions for utils/init */
272294
staticintDatabaseEncoding=MULTIBYTE;
273295

274296
void

‎src/include/mb/pg_wchar.h‎

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1,4 +1,4 @@
1-
/* $Id: pg_wchar.h,v 1.26 2001/05/03 21:38:44 momjian Exp $ */
1+
/* $Id: pg_wchar.h,v 1.27 2001/07/15 11:07:37 ishii Exp $ */
22

33
#ifndefPG_WCHAR_H
44
#definePG_WCHAR_H
@@ -136,6 +136,7 @@ extern intpg_mic_mblen(const unsigned char *);
136136
externintpg_mbstrlen(constunsignedchar*);
137137
externintpg_mbstrlen_with_len(constunsignedchar*,int);
138138
externintpg_mbcliplen(constunsignedchar*,int,int);
139+
externintpg_mbcharcliplen(constunsignedchar*,int,int);
139140
externpg_encoding_conv_tbl*pg_get_encent_by_encoding(int);
140141
externintpg_set_client_encoding(int);
141142
externintpg_get_client_encoding(void);

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