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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 1.17 1999/09/11 22:26:35 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#include <ctype.h>
#include "postgres.h"
#include "miscadmin.h"
#include "parser/scansup.h"
/* ----------------
* scanstr
*
* if the string passed in has escaped codes, map the escape codes to actual
* chars
*
* the string returned is palloc'd and should eventually be pfree'd by the
* caller!
* ----------------
*/
char *
scanstr(char *s)
{
char *newStr;
int len,
i,
j;
if (s == NULL || s[0] == '\0')
return pstrdup("");
len = strlen(s);
newStr = palloc(len+1); /* string cannot get longer */
for (i = 0, j = 0; i < len; i++)
{
if (s[i] == '\'')
{
/*
* Note: if scanner is working right, unescaped quotes can
* only appear in pairs, so there should be another character.
*/
i++;
newStr[j] = s[i];
}
else if (s[i] == '\\')
{
i++;
switch (s[i])
{
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 '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
{
int k;
long octVal = 0;
for (k = 0;
s[i + k] >= '0' && s[i + k] <= '7' && k < 3;
k++)
octVal = (octVal << 3) + (s[i + k] - '0');
i += k - 1;
newStr[j] = ((char) octVal);
}
break;
default:
newStr[j] = s[i];
break;
} /* switch */
} /* s[i] == '\\' */
else
newStr[j] = s[i];
j++;
}
newStr[j] = '\0';
return newStr;
}
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