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Commit85b762b

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Clean up array-dimensions parser a bit.
This code still needs a lot of love, however ...
1 parent12b401f commit85b762b

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1 file changed

+57
-41
lines changed

1 file changed

+57
-41
lines changed

‎src/backend/utils/adt/arrayfuncs.c‎

Lines changed: 57 additions & 41 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/arrayfuncs.c,v 1.64 2000/07/27 03:50:52 tgl Exp $
11+
* $Header: /cvsroot/pgsql/src/backend/utils/adt/arrayfuncs.c,v 1.65 2000/11/14 23:28:13 tgl Exp $
1212
*
1313
*-------------------------------------------------------------------------
1414
*/
@@ -100,15 +100,12 @@ array_in(PG_FUNCTION_ARGS)
100100
Oidelement_type=PG_GETARG_OID(1);/* type of an array element */
101101
int32typmod=PG_GETARG_INT32(2);/* typmod for array elements */
102102
inttyplen;
103-
booltypbyval,
104-
done;
103+
booltypbyval;
105104
chartypdelim;
106105
Oidtypinput;
107106
Oidtypelem;
108107
char*string_save,
109-
*p,
110-
*q,
111-
*r;
108+
*p;
112109
FmgrInfoinputproc;
113110
inti,
114111
nitems;
@@ -120,64 +117,83 @@ array_in(PG_FUNCTION_ARGS)
120117
lBound[MAXDIM];
121118
chartypalign;
122119

120+
/* Get info about element type, including its input conversion proc */
123121
system_cache_lookup(element_type, true,&typlen,&typbyval,&typdelim,
124122
&typelem,&typinput,&typalign);
125-
126123
fmgr_info(typinput,&inputproc);
127124

125+
/* Make a modifiable copy of the input */
126+
/* XXX why are we allocating an extra 2 bytes here? */
128127
string_save= (char*)palloc(strlen(string)+3);
129128
strcpy(string_save,string);
130129

131-
/* --- read array dimensions ---------- */
132-
p=q=string_save;
133-
done= false;
134-
for (ndim=0; !done;)
130+
/*
131+
* If the input string starts with dimension info, read and use that.
132+
* Otherwise, we require the input to be in curly-brace style, and we
133+
* prescan the input to determine dimensions.
134+
*
135+
* Dimension info takes the form of one or more [n] or [m:n] items.
136+
* The outer loop iterates once per dimension item.
137+
*/
138+
p=string_save;
139+
ndim=0;
140+
for (;;)
135141
{
142+
char*q;
143+
intub;
144+
145+
/*
146+
* Note: we currently allow whitespace between, but not within,
147+
* dimension items.
148+
*/
136149
while (isspace((int)*p))
137150
p++;
138-
if (*p=='[')
151+
if (*p!='[')
152+
break;/* no more dimension items */
153+
p++;
154+
if (ndim >=MAXDIM)
155+
elog(ERROR,"array_in: more than %d dimensions",MAXDIM);
156+
for (q=p;isdigit((int)*q);q++);
157+
if (q==p)/* no digits? */
158+
elog(ERROR,"array_in: missing dimension value");
159+
if (*q==':')
139160
{
140-
p++;
141-
if ((r= (char*)strchr(p,':'))== (char*)NULL)
142-
lBound[ndim]=1;
143-
else
144-
{
145-
*r='\0';
146-
lBound[ndim]=atoi(p);
147-
p=r+1;
148-
}
149-
for (q=p;isdigit((int)*q);q++);
150-
if (*q!=']')
151-
elog(ERROR,"array_in: missing ']' in array declaration");
161+
/* [m:n] format */
152162
*q='\0';
153-
dim[ndim]=atoi(p);
154-
if ((dim[ndim]<0)|| (lBound[ndim]<0))
155-
elog(ERROR,"array_in: array dimensions need to be positive");
156-
dim[ndim]=dim[ndim]-lBound[ndim]+1;
157-
if (dim[ndim]<0)
158-
elog(ERROR,"array_in: upper_bound cannot be < lower_bound");
163+
lBound[ndim]=atoi(p);
159164
p=q+1;
160-
ndim++;
165+
for (q=p;isdigit((int)*q);q++);
166+
if (q==p)/* no digits? */
167+
elog(ERROR,"array_in: missing dimension value");
161168
}
162169
else
163-
done= true;
170+
{
171+
/* [n] format */
172+
lBound[ndim]=1;
173+
}
174+
if (*q!=']')
175+
elog(ERROR,"array_in: missing ']' in array declaration");
176+
*q='\0';
177+
ub=atoi(p);
178+
p=q+1;
179+
if (ub<lBound[ndim])
180+
elog(ERROR,"array_in: upper_bound cannot be < lower_bound");
181+
dim[ndim]=ub-lBound[ndim]+1;
182+
ndim++;
164183
}
165184

166185
if (ndim==0)
167186
{
168-
if (*p=='{')
169-
{
170-
ndim=ArrayCount(p,dim,typdelim);
171-
for (i=0;i<ndim;i++)
172-
lBound[i]=1;
173-
}
174-
else
187+
/* No array dimensions, so intuit dimensions from brace structure */
188+
if (*p!='{')
175189
elog(ERROR,"array_in: Need to specify dimension");
190+
ndim=ArrayCount(p,dim,typdelim);
191+
for (i=0;i<ndim;i++)
192+
lBound[i]=1;
176193
}
177194
else
178195
{
179-
while (isspace((int)*p))
180-
p++;
196+
/* If array dimensions are given, expect '=' operator */
181197
if (strncmp(p,ASSGN,strlen(ASSGN))!=0)
182198
elog(ERROR,"array_in: missing assignment operator");
183199
p+=strlen(ASSGN);

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