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#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include "postgres.h"
#include "miscadmin.h"
#include "libpq/pqcomm.h"
#include "libpq/libpq.h"
/*
* The backend supports the old little endian byte order and the current
* network byte order.
*/
#ifndef FRONTEND
#include "libpq/libpq-be.h"
#ifdef HAVE_ENDIAN_H
#include <endian.h>
#endif
#ifndef BYTE_ORDER
#error BYTE_ORDER must be defined as LITTLE_ENDIAN, BIG_ENDIAN or PDP_ENDIAN
#endif
#if BYTE_ORDER == LITTLE_ENDIAN
#define ntoh_s(n) n
#define ntoh_l(n) n
#define hton_s(n) n
#define hton_l(n) n
#else
#if BYTE_ORDER == BIG_ENDIAN
/*
#define ntoh_s(n) (uint16)(((u_char *)&n)[1] << 8 \
| ((u_char *)&n)[0])
#define ntoh_l(n) (uint32)(((u_char *)&n)[3] << 24 \
| ((u_char *)&n)[2] << 16 \
| ((u_char *)&n)[1] << 8 \
| ((u_char *)&n)[0])
*/
#define ntoh_s(n) (uint16)((((uint16)n & 0x00ff) << 8) | \
(((uint16)n & 0xff00) >> 8))
#define ntoh_l(n) (uint32)((((uint32)n & 0x000000ff) << 24) | \
(((uint32)n & 0x0000ff00) << 8) | \
(((uint32)n & 0x00ff0000) >> 8) | \
(((uint32)n & 0xff000000) >> 24))
#define hton_s(n) (ntoh_s(n))
#define hton_l(n) (ntoh_l(n))
#else
#if BYTE_ORDER == PDP_ENDIAN
#error PDP_ENDIAN macros not written yet
#else
#error BYTE_ORDER not defined as anything understood
#endif
#endif
#endif
#endif
/* --------------------------------------------------------------------- */
int
pqPutShort(int integer)
{
uint16 n;
#ifdef FRONTEND
n = htons((uint16) integer);
#else
n = ((PG_PROTOCOL_MAJOR(FrontendProtocol) == 0) ? hton_s(integer) : htons((uint16) integer));
#endif
return pqPutNBytes((char *)&n, 2); /* 0 on success, EOF otherwise */
}
/* --------------------------------------------------------------------- */
int
pqPutLong(int integer)
{
uint32 n;
#ifdef FRONTEND
n = htonl((uint32) integer);
#else
n = ((PG_PROTOCOL_MAJOR(FrontendProtocol) == 0) ? hton_l(integer) : htonl((uint32) integer));
#endif
return pqPutNBytes((char *)&n, 4);
}
/* --------------------------------------------------------------------- */
int
pqGetShort(int *result)
{
uint16 n;
if (pqGetNBytes((char *)&n, 2) != 0)
return EOF;
#ifdef FRONTEND
*result = (int) ntohs(n);
#else
*result = (int) ((PG_PROTOCOL_MAJOR(FrontendProtocol) == 0) ? ntoh_s(n) : ntohs(n));
#endif
return 0;
}
/* --------------------------------------------------------------------- */
int
pqGetLong(int *result)
{
uint32 n;
if (pqGetNBytes((char *)&n, 4) != 0)
return EOF;
#ifdef FRONTEND
*result = (int) ntohl(n);
#else
*result = (int) ((PG_PROTOCOL_MAJOR(FrontendProtocol) == 0) ? ntoh_l(n) : ntohl(n));
#endif
return 0;
}
/* --------------------------------------------------------------------- */
/* pqGetNBytes: Read a chunk of exactly len bytes into buffer s.
* Return 0 if ok, EOF if trouble.
*/
int
pqGetNBytes(char *s, size_t len)
{
size_t amount;
while (len > 0)
{
while (PqRecvPointer >= PqRecvLength)
{
if (pq_recvbuf()) /* If nothing in buffer, then recv some */
return EOF; /* Failed to recv data */
}
amount = PqRecvLength - PqRecvPointer;
if (amount > len)
amount = len;
memcpy(s, PqRecvBuffer + PqRecvPointer, amount);
PqRecvPointer += amount;
s += amount;
len -= amount;
}
return 0;
}
/* --------------------------------------------------------------------- */
int
pqPutNBytes(const char *s, size_t len)
{
size_t amount;
while (len > 0)
{
if (PqSendPointer >= PQ_BUFFER_SIZE)
if (pq_flush()) /* If buffer is full, then flush it out */
return EOF;
amount = PQ_BUFFER_SIZE - PqSendPointer;
if (amount > len)
amount = len;
memcpy(PqSendBuffer + PqSendPointer, s, amount);
PqSendPointer += amount;
s += amount;
len -= amount;
}
return 0;
}
/* --------------------------------------------------------------------- */
int
pqGetString(char *s, size_t len)
{
int c;
/*
* Keep on reading until we get the terminating '\0',
* discarding any bytes we don't have room for.
*/
while ((c = pq_getchar()) != EOF && c != '\0')
if (len > 1)
{
*s++ = c;
len--;
}
*s = '\0';
if (c == EOF)
return EOF;
return 0;
}
/* --------------------------------------------------------------------- */
int
pqPutString(const char *s)
{
return pqPutNBytes(s,strlen(s)+1);
}
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