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/*-------------------------------------------------------------------------
*
* scansup.c--
* support routines for the lex/flex scanner, used by both the normal
* backend as well as the bootstrap backend
*
* Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/parser/scansup.c,v 1.2 1996/07/23 02:23:35 scrappy Exp $
*
*-------------------------------------------------------------------------
*/
#include <ctype.h>
#include <string.h>
#include "c.h"
#include "postgres.h"
#include "miscadmin.h"
#include "utils/elog.h"
#include "parser/scansup.h"
/*
* Scanner error handler.
*/
static void
serror(char *str)
{
elog(WARN, "*** scanner error: %s\n", str);
}
/* ----------------
* scanstr
*
* if the string passed in has escaped codes, map the escape codes to actual
* chars
*
* also, remove leading and ending quotes '"' if any
*
* the string passed in must be non-null
*
* the string returned is a pointer to static storage and should NOT
* be freed by the CALLER.
* ----------------
*/
char*
scanstr(char *s)
{
static char newStr[MAX_PARSE_BUFFER];
int len, i, start, j;
char delimiter;
if (s == NULL || s[0] == '\0')
return s;
len = strlen(s);
start = 0;
/* remove leading and trailing quotes, if any */
/* the normal backend lexer only accepts single quotes, but the
bootstrap lexer accepts double quotes */
delimiter = 0;
if (s[0] == '"' || s[0] == '\''){
delimiter = s[0];
start = 1;
}
if (delimiter != 0) {
if (s[len-1] == delimiter)
len = len - 1;
else
serror("mismatched quote delimiters");
}
for (i = start, j = 0; i < len ; i++) {
if (s[i] == '\'') {
i = i + 1;
if (s[i] == '\'')
newStr[j] = '\'';
}
else {
if (s[i] == '\\') {
i = i + 1;
switch (s[i]) {
case '\\':
newStr[j] = '\\';
break;
case 'b':
newStr[j] = '\b';
break;
case 'f':
newStr[j] = '\f';
break;
case 'n':
newStr[j] = '\n';
break;
case 'r':
newStr[j] = '\r';
break;
case 't':
newStr[j] = '\t';
break;
case '"':
newStr[j] = '"';
break;
case '\'':
newStr[j] = '\'';
break;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
{
char octal[4];
int k;
long octVal;
for (k=0;
s[i+k] >= '0' && s[i+k] <= '7' && k < 3;
k++)
octal[k] = s[i+k];
i += k-1;
octal[3] = '\0';
octVal = strtol(octal,0,8);
/* elog (NOTICE, "octal = %s octVal = %d, %od", octal, octVal, octVal);*/
if (octVal <= 0377) {
newStr[j] = ((char)octVal);
break;
}
}
default:
#ifdef ESCAPE_PATCH
newStr[j] = s[i];
#else
elog (WARN, "Bad escape sequence, s[i] = %d", s[i]);
#endif
} /* switch */
} /* s[i] == '\\' */
else
newStr[j] = s[i];
}
j++;
}
newStr[j] = '\0';
return newStr;
}
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