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/*
* stringutil.c - some tools for string handling
*
* Copyright (c) 2007 Marko Kreen, Skype Technologies OÜ
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <postgres.h>
#include <lib/stringinfo.h>
#include <utils/memutils.h>
#include <utils/builtins.h>
#if PG_VERSION_NUM >= 90200
#include <utils/json.h>
#endif
#if PG_VERSION_NUM >= 90300
#include <access/htup_details.h>
#endif
#if PG_VERSION_NUM >= 160000
#include <varatt.h>
#endif
#include "stringutil.h"
#ifndef SET_VARSIZE
#define SET_VARSIZE(x, len) VARATT_SIZEP(x) = len
#endif
#if PG_VERSION_NUM < 90100
static char *quote_literal_cstr(const char *str)
{
StringInfoData buf;
initStringInfo(&buf);
if (strchr(str, '\\'))
appendStringInfoCharMacro(&buf, 'E');
appendStringInfoCharMacro(&buf, '\'');
for (; *str; str++) {
if (*str == '\'' || *str == '\\')
appendStringInfoCharMacro(&buf, *str);
appendStringInfoCharMacro(&buf, *str);
}
appendStringInfoCharMacro(&buf, '\'');
return buf.data;
}
#endif
StringInfo pgq_init_varbuf(void)
{
StringInfo buf;
buf = makeStringInfo();
appendStringInfoString(buf, "XXXX");
return buf;
}
Datum pgq_finish_varbuf(StringInfo buf)
{
if (!buf) return (Datum)0;
SET_VARSIZE(buf->data, buf->len);
return PointerGetDatum(buf->data);
}
/*
* Find a string in comma-separated list.
*
* It does not support space inside tokens.
*/
bool pgq_strlist_contains(const char *liststr, const char *str)
{
int c, len = strlen(str);
const char *p, *listpos = liststr;
loop:
/* find string fragment, later check if actual token */
p = strstr(listpos, str);
if (p == NULL)
return false;
/* move listpos further */
listpos = p + len;
/* survive len=0 and avoid unnecessary compare */
if (*listpos)
listpos++;
/* check previous symbol */
if (p > liststr) {
c = *(p - 1);
if (!isspace(c) && c != ',')
goto loop;
}
/* check following symbol */
c = p[len];
if (c != 0 && !isspace(c) && c != ',')
goto loop;
return true;
}
/*
* quoting
*/
static void pgq_urlencode(StringInfo buf, const char *src)
{
static const char hextbl[] = "0123456789abcdef";
while (*src) {
unsigned c = (unsigned char)*src++;
if (c == ' ') {
appendStringInfoCharMacro(buf, '+');
} else if ((c >= '0' && c <= '9')
|| (c >= 'A' && c <= 'Z')
|| (c >= 'a' && c <= 'z')
|| c == '_' || c == '.' || c == '-') {
appendStringInfoCharMacro(buf, c);
} else {
appendStringInfoCharMacro(buf, '%');
appendStringInfoCharMacro(buf, hextbl[c >> 4]);
appendStringInfoCharMacro(buf, hextbl[c & 15]);
}
}
}
static void pgq_quote_literal(StringInfo buf, const char *src)
{
const char *quoted = quote_literal_cstr(src);
appendStringInfoString(buf, quoted);
pfree((char*)quoted);
}
/*
* pgq_quote_ident - Quote an identifier only if needed
*/
static void pgq_quote_ident(StringInfo buf, const char *src)
{
const char *quoted = quote_identifier(src);
appendStringInfoString(buf, quoted);
if (quoted != src)
pfree((char *)quoted);
}
#if PG_VERSION_NUM < 90200
static void escape_json(StringInfo buf, const char *p)
{
appendStringInfoCharMacro(buf, '\"');
for (; *p; p++) {
switch (*p) {
case '\b': appendStringInfoString(buf, "\\b"); break;
case '\f': appendStringInfoString(buf, "\\f"); break;
case '\n': appendStringInfoString(buf, "\\n"); break;
case '\r': appendStringInfoString(buf, "\\r"); break;
case '\t': appendStringInfoString(buf, "\\t"); break;
case '"': appendStringInfoString(buf, "\\\""); break;
case '\\': appendStringInfoString(buf, "\\\\"); break;
default:
if ((unsigned char) *p < ' ')
appendStringInfo(buf, "\\u%04x", (int) *p);
else
appendStringInfoCharMacro(buf, *p);
break;
}
}
appendStringInfoCharMacro(buf, '\"');
}
#endif
void pgq_encode_cstring(StringInfo tbuf, const char *str, enum PgqEncode encoding)
{
if (str == NULL)
elog(ERROR, "tbuf_encode_cstring: NULL");
switch (encoding) {
case TBUF_QUOTE_LITERAL:
pgq_quote_literal(tbuf, str);
break;
case TBUF_QUOTE_IDENT:
pgq_quote_ident(tbuf, str);
break;
case TBUF_QUOTE_URLENC:
pgq_urlencode(tbuf, str);
break;
case TBUF_QUOTE_JSON:
escape_json(tbuf, str);
break;
default:
elog(ERROR, "bad encoding");
}
}
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