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/*-------------------------------------------------------------------------
*
* scansup.c
* scanner support routines used by the core lexer
*
* Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* src/backend/parser/scansup.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include <ctype.h>
#include "mb/pg_wchar.h"
#include "parser/scansup.h"
#include "utils/pg_locale.h"
/*
* downcase_truncate_identifier() --- do appropriate downcasing and
* truncation of an unquoted identifier. Optionally warn of truncation.
*
* Returns a palloc'd string containing the adjusted identifier.
*
* Note: in some usages the passed string is not null-terminated.
*
* Note: the API of this function is designed to allow for downcasing
* transformations that increase the string length, but we don't yet
* support that. If you want to implement it, you'll need to fix
* SplitIdentifierString() in utils/adt/varlena.c.
*/
char *
downcase_truncate_identifier(const char *ident, int len, bool warn)
{
return downcase_identifier(ident, len, warn, true);
}
/*
* a workhorse for downcase_truncate_identifier
*/
char *
downcase_identifier(const char *ident, int len, bool warn, bool truncate)
{
char *result;
size_t needed pg_attribute_unused();
/*
* Preserves string length.
*
* NB: if we decide to support Unicode-aware identifier case folding, then
* we need to account for a change in string length.
*/
result = palloc(len + 1);
needed = pg_downcase_ident(result, len + 1, ident, len);
Assert(needed == len);
Assert(result[len] == '\0');
if (len >= NAMEDATALEN && truncate)
truncate_identifier(result, len, warn);
return result;
}
/*
* truncate_identifier() --- truncate an identifier to NAMEDATALEN-1 bytes.
*
* The given string is modified in-place, if necessary. A warning is
* issued if requested.
*
* We require the caller to pass in the string length since this saves a
* strlen() call in some common usages.
*/
void
truncate_identifier(char *ident, int len, bool warn)
{
if (len >= NAMEDATALEN)
{
len = pg_mbcliplen(ident, len, NAMEDATALEN - 1);
if (warn)
ereport(NOTICE,
(errcode(ERRCODE_NAME_TOO_LONG),
errmsg("identifier \"%s\" will be truncated to \"%.*s\"",
ident, len, ident)));
ident[len] = '\0';
}
}
/*
* scanner_isspace() --- return true if flex scanner considers char whitespace
*
* This should be used instead of the potentially locale-dependent isspace()
* function when it's important to match the lexer's behavior.
*
* In principle we might need similar functions for isalnum etc, but for the
* moment only isspace seems needed.
*/
bool
scanner_isspace(char ch)
{
/* This must match scan.l's list of {space} characters */
if (ch == ' ' ||
ch == '\t' ||
ch == '\n' ||
ch == '\r' ||
ch == '\v' ||
ch == '\f')
return true;
return false;
}
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