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-rw-r--r--src/backend/parser/Makefile6
-rw-r--r--src/backend/parser/scan.l129
2 files changed, 73 insertions, 62 deletions
diff --git a/src/backend/parser/Makefile b/src/backend/parser/Makefile
index b9e955e8523..63403cae170 100644
--- a/src/backend/parser/Makefile
+++ b/src/backend/parser/Makefile
@@ -4,7 +4,7 @@
# Makefile for parser
#
# IDENTIFICATION
-# $Header: /cvsroot/pgsql/src/backend/parser/Makefile,v 1.20 1999/05/03 19:09:40 momjian Exp $
+# $Header: /cvsroot/pgsql/src/backend/parser/Makefile,v 1.21 1999/10/18 02:42:31 tgl Exp $
#
#-------------------------------------------------------------------------
@@ -37,9 +37,7 @@ gram.c parse.h: gram.y
scan.c: scan.l
$(LEX) $<
- sed -e 's/#define YY_BUF_SIZE .*/#define YY_BUF_SIZE 65536/' \
- <lex.yy.c >scan.c
- rm -f lex.yy.c
+ mv lex.yy.c scan.c
# The following dependencies on parse.h are computed by
# make depend, but we state them here explicitly anyway because
diff --git a/src/backend/parser/scan.l b/src/backend/parser/scan.l
index 5e66e14fe19..02cecf0e589 100644
--- a/src/backend/parser/scan.l
+++ b/src/backend/parser/scan.l
@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/parser/scan.l,v 1.59 1999/10/09 01:32:38 momjian Exp $
+ * $Header: /cvsroot/pgsql/src/backend/parser/scan.l,v 1.60 1999/10/18 02:42:31 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -20,6 +20,7 @@
#include <errno.h>
#include "postgres.h"
+
#include "miscadmin.h"
#include "nodes/parsenodes.h"
#include "nodes/pg_list.h"
@@ -29,16 +30,6 @@
#include "parser/scansup.h"
#include "utils/builtins.h"
-#ifdef YY_READ_BUF_SIZE
-#undef YY_READ_BUF_SIZE
-#endif
-#define YY_READ_BUF_SIZE MAX_PARSE_BUFFER
-
-#ifdef YY_READ_BUF_SIZE
-#undef YY_READ_BUF_SIZE
-#endif
-#define YY_READ_BUF_SIZE MAX_PARSE_BUFFER
-
extern char *parseString;
static char *parseCh;
@@ -47,9 +38,8 @@ static char *parseCh;
#undef yywrap
#endif /* yywrap */
+/* set up my input handler --- need one flavor for flex, one for lex */
#if defined(FLEX_SCANNER)
-/* MAX_PARSE_BUFFER is defined in miscadmin.h */
-#define YYLMAX MAX_PARSE_BUFFER
#define YY_NO_UNPUT
static int myinput(char* buf, int max);
#undef YY_INPUT
@@ -63,8 +53,18 @@ void unput(char);
extern YYSTYPE yylval;
-int llen;
-char literal[MAX_PARSE_BUFFER];
+/*
+ * literalbuf is used to accumulate literal values when multiple rules
+ * are needed to parse a single literal. Call startlit to reset buffer
+ * to empty, addlit to add text. Note that the buffer is palloc'd and
+ * starts life afresh on every parse cycle.
+ */
+static char *literalbuf; /* expandable buffer */
+static int literallen; /* actual current length */
+static int literalalloc; /* current allocated buffer size */
+
+#define startlit() (literalbuf[0] = '\0', literallen = 0)
+static void addlit(char *ytext, int yleng);
%}
/* OK, here is a short description of lex/flex rules behavior.
@@ -153,17 +153,14 @@ self [,()\[\].;$\:\+\-\*\/\%\^\<\>\=\|]
op_and_self [\~\!\@\#\^\&\|\`\?\$\:\+\-\*\/\%\<\>\=]
operator {op_and_self}+
-/* we do not allow unary minus in numbers.
- * instead we pass it verbatim to parser. there it gets
+/* we no longer allow unary minus in numbers.
+ * instead we pass it separately to parser. there it gets
* coerced via doNegate() -- Leon aug 20 1999
*/
integer {digit}+
decimal (({digit}*\.{digit}+)|({digit}+\.{digit}*))
real ((({digit}*\.{digit}+)|({digit}+\.{digit}*)|({digit}+))([Ee][-+]?{digit}+))
-/*
-real (((({digit}*\.{digit}+)|({digit}+\.{digit}*))([Ee][-+]?{digit}+)?)|({digit}+[Ee][-+]?{digit}+))
-*/
param \${integer}
@@ -199,25 +196,22 @@ other .
{xbstart} {
BEGIN(xb);
- llen = 0;
- *literal = '\0';
+ startlit();
}
<xb>{xbstop} {
char* endptr;
BEGIN(INITIAL);
errno = 0;
- yylval.ival = strtol((char *)literal,&endptr,2);
+ yylval.ival = strtol(literalbuf, &endptr, 2);
if (*endptr != '\0' || errno == ERANGE)
- elog(ERROR,"Bad binary integer input '%s'",literal);
+ elog(ERROR, "Bad binary integer input '%s'",
+ literalbuf);
return ICONST;
}
<xh>{xhinside} |
<xb>{xbinside} {
- if ((llen+yyleng) > (MAX_PARSE_BUFFER - 1))
- elog(ERROR,"quoted string parse buffer of %d chars exceeded",MAX_PARSE_BUFFER);
- memcpy(literal+llen, yytext, yyleng+1);
- llen += yyleng;
+ addlit(yytext, yyleng);
}
<xh>{xhcat} |
<xb>{xbcat} {
@@ -225,37 +219,33 @@ other .
{xhstart} {
BEGIN(xh);
- llen = 0;
- *literal = '\0';
+ startlit();
}
<xh>{xhstop} {
char* endptr;
BEGIN(INITIAL);
errno = 0;
- yylval.ival = strtol((char *)literal,&endptr,16);
+ yylval.ival = strtol(literalbuf, &endptr, 16);
if (*endptr != '\0' || errno == ERANGE)
- elog(ERROR,"Bad hexadecimal integer input '%s'",literal);
+ elog(ERROR, "Bad hexadecimal integer input '%s'",
+ literalbuf);
return ICONST;
}
{xqstart} {
BEGIN(xq);
- llen = 0;
- *literal = '\0';
+ startlit();
}
<xq>{xqstop} {
BEGIN(INITIAL);
- yylval.str = scanstr(literal);
+ yylval.str = scanstr(literalbuf);
return SCONST;
}
<xq>{xqdouble} |
<xq>{xqinside} |
<xq>{xqliteral} {
- if ((llen+yyleng) > (MAX_PARSE_BUFFER - 1))
- elog(ERROR,"quoted string parse buffer of %d chars exceeded",MAX_PARSE_BUFFER);
- memcpy(literal+llen, yytext, yyleng+1);
- llen += yyleng;
+ addlit(yytext, yyleng);
}
<xq>{xqcat} {
}
@@ -263,24 +253,20 @@ other .
{xdstart} {
BEGIN(xd);
- llen = 0;
- *literal = '\0';
+ startlit();
}
<xd>{xdstop} {
BEGIN(INITIAL);
- yylval.str = pstrdup(literal);
+ yylval.str = pstrdup(literalbuf);
return IDENT;
}
<xd>{xdinside} {
- if ((llen+yyleng) > (MAX_PARSE_BUFFER - 1))
- elog(ERROR,"quoted string parse buffer of %d chars exceeded",MAX_PARSE_BUFFER);
- memcpy(literal+llen, yytext, yyleng+1);
- llen += yyleng;
+ addlit(yytext, yyleng);
}
{typecast} { return TYPECAST; }
-{self} { return yytext[0]; }
+{self} { return yytext[0]; }
{operator} {
if (strcmp((char*)yytext,"!=") == 0)
@@ -391,6 +377,12 @@ init_io()
because input()/myinput() checks the non-nullness of parseCh
to know when to pass the string to lex/flex */
parseCh = NULL;
+
+ /* initialize literal buffer to a reasonable but expansible size */
+ literalalloc = 128;
+ literalbuf = (char *) palloc(literalalloc);
+ startlit();
+
#if defined(FLEX_SCANNER)
if (YY_CURRENT_BUFFER)
yy_flush_buffer(YY_CURRENT_BUFFER);
@@ -398,7 +390,24 @@ init_io()
BEGIN INITIAL;
}
+static void
+addlit(char *ytext, int yleng)
+{
+ /* enlarge buffer if needed */
+ if ((literallen+yleng) >= literalalloc)
+ {
+ do {
+ literalalloc *= 2;
+ } while ((literallen+yleng) >= literalalloc);
+ literalbuf = (char *) repalloc(literalbuf, literalalloc);
+ }
+ /* append data --- note we assume ytext is null-terminated */
+ memcpy(literalbuf+literallen, ytext, yleng+1);
+ literallen += yleng;
+}
+
#if !defined(FLEX_SCANNER)
+
/* get lex input from a string instead of from stdin */
int
input()
@@ -420,27 +429,31 @@ unput(char c)
else if (c != 0)
*--parseCh = c;
}
+
#endif /* !defined(FLEX_SCANNER) */
#ifdef FLEX_SCANNER
+
/* input routine for flex to read input from a string instead of a file */
static int
myinput(char* buf, int max)
{
- int len, copylen;
+ int len;
if (parseCh == NULL)
parseCh = parseString;
len = strlen(parseCh); /* remaining data available */
- if (len >= max)
- copylen = max - 1;
- else
- copylen = len;
- if (copylen > 0)
- memcpy(buf, parseCh, copylen);
- buf[copylen] = '\0';
- parseCh += copylen;
- return copylen;
+ /* Note: this code used to think that flex wants a null-terminated
+ * string. It does NOT, and returning 1 less character than it asks
+ * for will cause failure under the right boundary conditions. So
+ * shut up and fill the buffer to the limit, you hear?
+ */
+ if (len > max)
+ len = max;
+ if (len > 0)
+ memcpy(buf, parseCh, len);
+ parseCh += len;
+ return len;
}
-#endif /* FLEX_SCANNER */
+#endif /* FLEX_SCANNER */
generated by cgit v1.2.3 (git 2.25.1) at 2025-06-10 14:01:34 +0000