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Postgres FD Implementation
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Abuhujair Javed
Postgres FD Implementation
Commits
bf138e21
Commit
bf138e21
authored
27 years ago
by
Thomas G. Lockhart
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Add routines for text trimming on both ends, substring, and string position.
Used to support SQL92 compatibility.
parent
d95c93bf
No related merge requests found
Changes
2
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2 changed files
with
147 additions
and
39 deletions
+147
-39
src/backend/utils/adt/oracle_compat.c
src/backend/utils/adt/oracle_compat.c
+82
-15
src/backend/utils/adt/varlena.c
src/backend/utils/adt/varlena.c
+65
-24
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src/backend/utils/adt/oracle_compat.c
View file @
bf138e21
/*
* Edmund Mergl <E.Mergl@bawue.de>
*
* $Id: oracle_compat.c,v 1.
6 1997/05/07 02:46:45 scrappy
Exp $
* $Id: oracle_compat.c,v 1.
7 1997/07/29 16:12:01 thomas
Exp $
*
*/
...
...
@@ -15,6 +15,7 @@ text *upper(text *string);
text
*
initcap
(
text
*
string
);
text
*
lpad
(
text
*
string1
,
int4
len
,
text
*
string2
);
text
*
rpad
(
text
*
string1
,
int4
len
,
text
*
string2
);
text
*
btrim
(
text
*
string
,
text
*
set
);
text
*
ltrim
(
text
*
string
,
text
*
set
);
text
*
rtrim
(
text
*
string
,
text
*
set
);
text
*
substr
(
text
*
string
,
int4
m
,
int4
n
);
...
...
@@ -246,6 +247,81 @@ rpad(text *string1, int4 len, text *string2)
}
/********************************************************************
*
* btrim
*
* Syntax:
*
* text *btrim(text *string, text *set)
*
* Purpose:
*
* Returns string with characters removed from the front and back
* up to the first character not in set.
*
********************************************************************/
text
*
btrim
(
text
*
string
,
text
*
set
)
{
text
*
ret
;
char
*
ptr
,
*
end
,
*
ptr2
,
*
end2
;
int
m
;
if
((
string
==
(
text
*
)
NULL
)
||
((
m
=
VARSIZE
(
string
)
-
VARHDRSZ
)
<=
0
)
||
(
set
==
(
text
*
)
NULL
)
||
((
VARSIZE
(
set
)
-
VARHDRSZ
)
<=
0
))
return
string
;
ptr
=
VARDATA
(
string
);
ptr2
=
VARDATA
(
set
);
end2
=
VARDATA
(
set
)
+
VARSIZE
(
set
)
-
VARHDRSZ
-
1
;
while
(
m
--
)
{
while
(
ptr2
<=
end2
)
{
if
(
*
ptr
==
*
ptr2
)
{
break
;
}
++
ptr2
;
}
if
(
*
ptr
!=
*
ptr2
)
{
break
;
}
ptr
++
;
ptr2
=
VARDATA
(
set
);
}
++
m
;
end
=
VARDATA
(
string
)
+
VARSIZE
(
string
)
-
VARHDRSZ
-
1
;
ptr2
=
VARDATA
(
set
);
while
(
m
--
)
{
while
(
ptr2
<=
end2
)
{
if
(
*
end
==
*
ptr2
)
{
break
;
}
++
ptr2
;
}
if
(
*
end
!=
*
ptr2
)
{
break
;
}
--
end
;
ptr2
=
VARDATA
(
set
);
}
++
m
;
ret
=
(
text
*
)
palloc
(
VARHDRSZ
+
m
);
VARSIZE
(
ret
)
=
VARHDRSZ
+
m
;
memcpy
(
VARDATA
(
ret
),
ptr
,
m
);
return
ret
;
}
/* btrim() */
/********************************************************************
*
* ltrim
...
...
@@ -265,7 +341,7 @@ text *
ltrim
(
text
*
string
,
text
*
set
)
{
text
*
ret
;
char
*
ptr
,
*
ptr2
,
*
end2
,
*
ptr_ret
;
char
*
ptr
,
*
ptr2
,
*
end2
;
int
m
;
if
((
string
==
(
text
*
)
NULL
)
||
...
...
@@ -297,11 +373,7 @@ ltrim(text *string, text *set)
ret
=
(
text
*
)
palloc
(
VARHDRSZ
+
m
);
VARSIZE
(
ret
)
=
VARHDRSZ
+
m
;
ptr_ret
=
VARDATA
(
ret
);
while
(
m
--
)
{
*
ptr_ret
++
=
*
ptr
++
;
}
memcpy
(
VARDATA
(
ret
),
ptr
,
m
);
return
ret
;
}
...
...
@@ -357,6 +429,9 @@ rtrim(text *string, text *set)
ret
=
(
text
*
)
palloc
(
VARHDRSZ
+
m
);
VARSIZE
(
ret
)
=
VARHDRSZ
+
m
;
#if FALSE
memcpy
(
VARDATA
(
ret
),
ptr
-
VARSIZE
(
ret
)
+
m
,
m
);
#endif
ptr_ret
=
VARDATA
(
ret
)
+
m
-
1
;
...
...
@@ -454,11 +529,3 @@ translate(text *string, char from, char to)
/* EOF */
This diff is collapsed.
Click to expand it.
src/backend/utils/adt/varlena.c
View file @
bf138e21
...
...
@@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/adt/varlena.c,v 1.1
6 1997/06/11 05:18:02 vadim
Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/adt/varlena.c,v 1.1
7 1997/07/29 16:12:07 thomas
Exp $
*
*-------------------------------------------------------------------------
*/
...
...
@@ -216,40 +216,81 @@ int textlen (text* t)
/*
* textcat -
* takes two text* and returns a text* that is the concatentation of
* the two
*/
/*
* Rewrited by Sapa, sapa@hq.icb.chel.su. 8-Jul-96.
* the two.
*
* Rewritten by Sapa, sapa@hq.icb.chel.su. 8-Jul-96.
* Updated by Thomas, Thomas.Lockhart@jpl.nasa.gov 1997-07-10.
* Allocate space for output in all cases.
* XXX - thomas 1997-07-10
* As in previous code, allow concatenation when one string is NULL.
* Is this OK?
*/
text
*
textcat
(
text
*
t1
,
text
*
t2
)
{
int
len1
,
len2
,
new
len
;
int
len1
,
len2
,
len
;
char
*
ptr
;
text
*
result
;
/* Check for NULL strings... */
if
(
t1
==
NULL
)
return
t2
;
if
(
t2
==
NULL
)
return
t1
;
if
(
!
PointerIsValid
(
t1
)
&&
!
PointerIsValid
(
t2
))
return
(
NULL
);
/* Check for ZERO-LENGTH strings... */
/* I use <= instead of == , I know - it's paranoia, but... */
if
((
len1
=
VARSIZE
(
t1
)
-
VARHDRSZ
)
<=
0
)
return
t2
;
if
((
len2
=
VARSIZE
(
t2
)
-
VARHDRSZ
)
<=
0
)
return
t1
;
len1
=
(
PointerIsValid
(
t1
)
?
(
VARSIZE
(
t1
)
-
VARHDRSZ
)
:
0
);
if
(
len1
<
0
)
len1
=
0
;
len2
=
(
PointerIsValid
(
t2
)
?
(
VARSIZE
(
t2
)
-
VARHDRSZ
)
:
0
)
;
if
(
len2
<
0
)
len2
=
0
;
result
=
(
text
*
)
palloc
(
new
len
=
len1
+
len2
+
VARHDRSZ
);
result
=
PALLOC
(
len
=
len1
+
len2
+
VARHDRSZ
);
/* Fill data field of result string... */
memcpy
(
ptr
=
VARDATA
(
result
),
VARDATA
(
t1
),
len1
);
memcpy
(
ptr
+
len1
,
VARDATA
(
t2
),
len2
);
ptr
=
VARDATA
(
result
);
if
(
PointerIsValid
(
t1
))
memcpy
(
ptr
,
VARDATA
(
t1
),
len1
);
if
(
PointerIsValid
(
t2
))
memcpy
(
ptr
+
len1
,
VARDATA
(
t2
),
len2
);
/* Set size of result string... */
VARSIZE
(
result
)
=
new
len
;
VARSIZE
(
result
)
=
len
;
return
result
;
}
return
(
result
);
}
/* textcat() */
/*
* textpos -
* Return the position of the specified substring.
* Implements the SQL92 POSITION() function.
* Ref: A Guide To The SQL Standard, Date & Darwen, 1997
* - thomas 1997-07-27
*/
int32
textpos
(
text
*
t1
,
text
*
t2
)
{
int
pos
;
int
px
,
p
;
int
len1
,
len2
;
char
*
p1
,
*
p2
;
if
(
!
PointerIsValid
(
t1
)
||
!
PointerIsValid
(
t2
))
return
(
0
);
if
(
VARSIZE
(
t2
)
<=
0
)
return
(
1
);
len1
=
(
VARSIZE
(
t1
)
-
VARHDRSZ
);
len2
=
(
VARSIZE
(
t2
)
-
VARHDRSZ
);
p1
=
VARDATA
(
t1
);
p2
=
VARDATA
(
t2
);
pos
=
0
;
px
=
(
len1
-
len2
);
for
(
p
=
0
;
p
<=
px
;
p
++
)
{
if
((
*
p2
==
*
p1
)
&&
(
strncmp
(
p1
,
p2
,
len2
)
==
0
))
{
pos
=
p
+
1
;
break
;
};
p1
++
;
};
return
(
pos
);
}
/* textpos() */
/*
* texteq - returns 1 iff arguments are equal
...
...
@@ -269,15 +310,15 @@ texteq(struct varlena *arg1, struct varlena *arg2)
a2p
=
arg2
->
vl_dat
;
/*
* Varlenas are stored as the total size (data + size variable)
* followed by the data.
The size variable is an int32 so the
*
length of the data is the total length less sizeof(int32)
* followed by the data.
*
Use VARHDRSZ instead of explicit sizeof() - thomas 1997-07-10
*/
len
-=
sizeof
(
int32
)
;
len
-=
VARHDRSZ
;
while
(
len
--
!=
0
)
if
(
*
a1p
++
!=
*
a2p
++
)
return
((
bool
)
0
);
return
((
bool
)
1
);
}
}
/* texteq() */
bool
textne
(
struct
varlena
*
arg1
,
struct
varlena
*
arg2
)
...
...
This diff is collapsed.
Click to expand it.
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