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963 lines (894 loc) · 25.3 KB
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/*
* SimplePgSQL.c - Lightweight PostgreSQL connector for Arduino
* Copyright (C) Bohdan R. Rau 2016 <ethanak@polip.com>
*
* SimplePgSQL is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* SimplePgSQL is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with SimplePgSQL. If not, write to:
* The Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301, USA.
*/
// 238 469 / 34004
#include "SimplePgSQL.h"
#ifdef PG_USE_MD5
static void
bytesToHex(const uint8_t b[16], char *s)
{
int q, w;
static PROGMEM const char hex[] = "0123456789abcdef";
for (q = 0, w = 0; q < 16; q++)
{
s[w++] = pgm_read_byte(&hex[(b[q] >> 4) & 0x0F]);
s[w++] = pgm_read_byte(&hex[b[q] & 0x0F]);
}
s[w] = '\0';
}
#ifdef ESP8266
#include <md5.h>
static void pg_md5_encrypt(const char *password, char *salt, int salt_len, char *outbuf)
{
md5_context_t context;
uint8_t sum[16];
*outbuf++ = 'm';
*outbuf++ = 'd';
*outbuf++ = '5';
MD5Init(&context);
MD5Update(&context, (uint8_t *)password, strlen(password));
MD5Update(&context, (uint8_t *)salt, salt_len);
MD5Final(sum, &context);
bytesToHex(sum, outbuf);
}
#else
#include <MD5.h>
static void pg_md5_encrypt(const char *password, char *salt, int salt_len, char *outbuf)
{
MD5_CTX context;
uint8_t sum[16];
*outbuf++ = 'm';
*outbuf++ = 'd';
*outbuf++ = '5';
MD5::MD5Init(&context);
MD5::MD5Update(&context, (uint8_t *)password, strlen(password));
MD5::MD5Update(&context, (uint8_t *)salt, salt_len);
MD5::MD5Final(sum, &context);
bytesToHex(sum, outbuf);
}
#endif
#endif
#define MD5_PASSWD_LEN 35
#define AUTH_REQ_OK 0 /* User is authenticated */
#define AUTH_REQ_PASSWORD 3 /* Password */
#define AUTH_REQ_MD5 5 /* md5 password */
static PROGMEM const char EM_OOM [] = "Out of memory";
static PROGMEM const char EM_READ [] = "Backend read error";
static PROGMEM const char EM_WRITE [] = "Backend write error";
static PROGMEM const char EM_CONN [] = "Cannot connect to server";
static PROGMEM const char EM_SYNC [] = "Backend out of sync";
static PROGMEM const char EM_INTR [] = "Internal error";
static PROGMEM const char EM_UAUTH [] = "Unsupported auth method";
static PROGMEM const char EM_BIN [] = "Binary format not supported";
static PROGMEM const char EM_EXEC [] = "Previous execution not finished";
static PROGMEM const char EM_PASSWD [] = "Password required";
static PROGMEM const char EM_EMPTY [] = "Query is empty";
static PROGMEM const char EM_FORMAT [] = "Illegal formatting character";
PGconnection::PGconnection(Client *c,
int flags,
int memory,
char *foreignBuffer)
{
conn_status = CONNECTION_NEEDED;
client = c;
Buffer = foreignBuffer;
_passwd = NULL;
_flags = flags & ~PG_FLAG_STATIC_BUFFER;
if (memory <= 0) bufSize = PG_BUFFER_SIZE;
else bufSize = memory;
if (foreignBuffer) {
_flags |= PG_FLAG_STATIC_BUFFER;
}
}
int PGconnection::setDbLogin(IPAddress server,
const char *user,
const char *passwd,
const char *db,
const char *charset,
int port)
{
char *startpacket;
int packetlen;
int len;
close();
if (!db) db = user;
len = strlen(user) + 1;
if (passwd) {
len += strlen(passwd) + 1;
}
_user = (char *)malloc(len);
strcpy(_user, user);
if (passwd) {
_passwd = _user + strlen(user) + 1;
strcpy(_passwd, passwd);
}
else {
_passwd = NULL;
}
if (!Buffer) Buffer = (char *) malloc(bufSize);
byte connected = client -> connect(server, port);
if (!connected) {
setMsg_P(EM_CONN, PG_RSTAT_HAVE_ERROR);
return conn_status = CONNECTION_BAD;
}
packetlen = build_startup_packet(NULL, db, charset);
if (packetlen > bufSize - 10) {
setMsg_P(EM_OOM, PG_RSTAT_HAVE_ERROR);
conn_status = CONNECTION_BAD;
return conn_status;
}
startpacket=Buffer + (bufSize - (packetlen + 1));
build_startup_packet(startpacket, db, charset);
if (pqPacketSend(0, startpacket, packetlen) < 0) {
setMsg_P(EM_WRITE, PG_RSTAT_HAVE_ERROR);
return conn_status = CONNECTION_BAD;
}
attempts = 0;
return conn_status = CONNECTION_AWAITING_RESPONSE;
}
void PGconnection::close(void)
{
if (client->connected()) {
pqPacketSend('X', NULL, 0);
client->stop();
}
if (Buffer && !(_flags & PG_FLAG_STATIC_BUFFER)) {
free(Buffer);
Buffer = NULL;
}
if (_user) {
free(_user);
_user = _passwd = NULL;
}
conn_status = CONNECTION_NEEDED;
}
int PGconnection::status(void)
{
char bereq;
char rc;
int32_t msgLen;
int32_t areq;
char * pwd = _passwd;
char salt[4];
switch(conn_status) {
case CONNECTION_NEEDED:
case CONNECTION_OK:
case CONNECTION_BAD:
return conn_status;
case CONNECTION_AWAITING_RESPONSE:
if (!client->available()) return conn_status;
if (attempts++ >= 2) {
setMsg_P(EM_SYNC, PG_RSTAT_HAVE_ERROR);
return conn_status = CONNECTION_BAD;
}
if (pqGetc(&bereq)) {
goto read_error;
}
if (bereq == 'E') {
pqGetInt4(&msgLen);
pqGetNotice(PG_RSTAT_HAVE_ERROR);
return conn_status = CONNECTION_BAD;
}
if (bereq != 'R') {
setMsg_P(EM_SYNC, PG_RSTAT_HAVE_ERROR);
return conn_status = CONNECTION_BAD;
}
if (pqGetInt4(&msgLen)) {
goto read_error;
}
if (pqGetInt4(&areq)) {
goto read_error;
}
if (areq == AUTH_REQ_OK) {
if (_user) {
free(_user);
_user = _passwd=NULL;
}
result_status = PG_RSTAT_READY;
return conn_status = CONNECTION_AUTH_OK;
}
if (
#ifdef PG_USE_MD5
areq != AUTH_REQ_MD5 &&
#endif
areq != AUTH_REQ_PASSWORD) {
setMsg_P(EM_UAUTH, PG_RSTAT_HAVE_ERROR);
return conn_status = CONNECTION_BAD;
}
if (!_passwd || !*_passwd) {
setMsg_P(EM_PASSWD, PG_RSTAT_HAVE_ERROR);
return conn_status = CONNECTION_BAD;
}
pwd = _passwd;
#ifdef PG_USE_MD5
if (areq == AUTH_REQ_MD5) {
if (pqGetnchar(salt, 4)) goto read_error;
if (bufSize < 3 * MD5_PASSWD_LEN + 10) {
setMsg_P(EM_OOM, PG_RSTAT_HAVE_ERROR);
return conn_status = CONNECTION_BAD;
}
char *crypt_pwd = Buffer + (bufSize - (2 * (MD5_PASSWD_LEN + 1)));
char *crypt_pwd2 = crypt_pwd + MD5_PASSWD_LEN + 1;
pg_md5_encrypt(pwd, _user, strlen(_user), crypt_pwd2);
pg_md5_encrypt(crypt_pwd2 + 3, salt,4, crypt_pwd);
pwd = crypt_pwd;
}
#endif
rc=pqPacketSend('p', pwd, strlen(pwd) + 1);
if (rc) {
goto write_error;
}
return conn_status;
case CONNECTION_AUTH_OK:
for (;;) {
if (!client -> available()) return conn_status;
if (pqGetc(&bereq)) goto read_error;
if (pqGetInt4(&msgLen)) goto read_error;
msgLen -= 4;
if (bereq == 'A' || bereq == 'N' || bereq == 'S' || bereq == 'K') {
if (pqSkipnchar(msgLen)) goto read_error;
continue;
}
if (bereq == 'E') {
pqGetNotice(PG_RSTAT_HAVE_ERROR);
return conn_status = CONNECTION_BAD;
}
/* if (bereq == 'K') {
if (pqGetInt4(&be_pid)) goto read_error;
if (pqGetInt4(&be_key)) goto read_error;
continue;
}
*/
if (bereq == 'Z') {
pqSkipnchar(msgLen);
return conn_status = CONNECTION_OK;
}
return conn_status = CONNECTION_BAD;
}
default:
setMsg_P(EM_INTR, PG_RSTAT_HAVE_ERROR);
return conn_status = CONNECTION_BAD;
}
read_error:
setMsg_P(EM_READ, PG_RSTAT_HAVE_ERROR);
return conn_status = CONNECTION_BAD;
write_error:
setMsg_P(EM_WRITE, PG_RSTAT_HAVE_ERROR);
return conn_status = CONNECTION_BAD;
}
int PGconnection::execute(const char *query, int progmem)
{
if (!(result_status & PG_RSTAT_READY)) {
setMsg_P(EM_EXEC, PG_RSTAT_HAVE_ERROR);
return -1;
}
int len = progmem ? strlen_P(query) :strlen(query);
if (pqPacketSend('Q', query, len+1, progmem)) {
setMsg_P(EM_WRITE, PG_RSTAT_HAVE_ERROR);
conn_status = CONNECTION_BAD;
return -1;
}
result_status = PG_RSTAT_COMMAND_SENT;
return 0;
}
int PGconnection::escapeName(const char *inbuf, char *outbuf)
{
const char *c;
int l = 2;
for (c=inbuf; *c; c++) {
l++;
if (*c == '\\' || *c == '"') l++;
}
if (outbuf) {
*outbuf++='"';
for (c=inbuf; *c; c++) {
*outbuf++ = *c;
if (*c == '\\' || *c == '"') *outbuf++ = *c;
}
*outbuf++='"';
}
return l;
}
int PGconnection::escapeString(const char *inbuf, char *outbuf)
{
const char *c;
int e = 0, l;
for (c=inbuf; *c; c++) {
if (*c == '\\' || *c == '\'') e++;
}
l = e + (c - inbuf) + (e ? 4 : 2);
if (outbuf) {
if (e) {
*outbuf++=' ';
*outbuf++='E';
}
*outbuf++='\'';
for (c=inbuf; *c; c++) {
*outbuf++ = *c;
if (*c == '\\' || *c == '\'') *outbuf++ = *c;
}
*outbuf++='\'';
}
return l;
}
char * PGconnection::getValue(int nr)
{
int i;
if (_null & (1<<nr)) return NULL;
char *c=Buffer;
if (nr < 0 || nr >= _nfields) return NULL;
for (i=0; i < nr; i++) {
if (_null & (1 <<i)) continue;
c += strlen(c) + 1;
}
return c;
}
char *PGconnection::getColumn(int n)
{
char *c;int i;
if (!(result_status & PG_RSTAT_HAVE_COLUMNS)) return NULL;
if (n < 0 || n >= _nfields) return NULL;
for (c = Buffer, i = 0; i<n; i++) {
c += strlen(c) + 1;
}
return c;
}
char *PGconnection::getMessage(void)
{
if (!(result_status & PG_RSTAT_HAVE_MESSAGE)) return NULL;
return Buffer;
}
int PGconnection::getData(void)
{
char id;
int32_t msgLen;
int rc;
char *c;
if (!client->available()) return 0;
if (pqGetc(&id)) goto read_error;
if (pqGetInt4(&msgLen)) goto read_error;
//Serial.printf("ID=%c\n", id);
msgLen -= 4;
switch(id) {
case 'T':
if ((rc=pqGetRowDescriptions())) {
if (rc == -2) setMsg_P(EM_OOM, PG_RSTAT_HAVE_ERROR);
else if (rc == -3) setMsg_P(EM_BIN, PG_RSTAT_HAVE_ERROR);
goto read_error;
}
if (_flags & PG_FLAG_IGNORE_COLUMNS) {
result_status &= ~PG_RSTAT_HAVE_MASK;
return 0;
}
return result_status = (result_status & ~PG_RSTAT_HAVE_MASK) | PG_RSTAT_HAVE_COLUMNS;
case 'E':
if (pqGetNotice(PG_RSTAT_HAVE_ERROR)) goto read_error;
return result_status;
case 'N':
if (_flags & PG_FLAG_IGNORE_NOTICES) {
if (pqSkipnchar(msgLen)) goto read_error;
return 0;
}
if(pqGetNotice(PG_RSTAT_HAVE_NOTICE)) goto read_error;
return result_status = (result_status & ~PG_RSTAT_HAVE_MASK) | PG_RSTAT_HAVE_NOTICE;
case 'A':
if (_flags & PG_FLAG_IGNORE_NOTICES) {
if (pqSkipnchar(msgLen)) goto read_error;
return 0;
}
if (pqGetNotify(msgLen)) goto read_error;
return result_status = (result_status & ~PG_RSTAT_HAVE_MASK) | PG_RSTAT_HAVE_NOTICE;
case 'Z':
if (pqSkipnchar(msgLen)) goto read_error;
result_status = (result_status & PG_RSTAT_HAVE_SUMMARY) | PG_RSTAT_READY;
return PG_RSTAT_READY;
case 'S': // parameters setting ignored
case 'K': // should not be here?
if (pqSkipnchar(msgLen)) goto read_error;
return 0;
case 'C': // summary
if (msgLen > bufSize - 1) goto oom;
if (pqGetnchar(Buffer, msgLen)) goto read_error;
Buffer[msgLen] = 0;
_ntuples = 0;
result_status = (result_status & ~PG_RSTAT_HAVE_MASK) | PG_RSTAT_HAVE_SUMMARY;
for (c = Buffer; *c && !isdigit(*c); c++);
if (!*c) return result_status;
if (strncmp(Buffer,"SELECT ",7)) {
for (; *c && isdigit(*c); c++);
for (; *c && !isdigit(*c); c++);
}
if (*c) _ntuples = strtol(c, NULL, 10);
return result_status;
case 'D':
if ((rc=pqGetRow())) {
if (rc == -2) setMsg_P(EM_OOM, PG_RSTAT_HAVE_ERROR);
else if (rc == -3) setMsg_P(EM_SYNC, PG_RSTAT_HAVE_ERROR);
goto read_error;
}
if (_flags & PG_FLAG_IGNORE_COLUMNS) {
result_status &= ~PG_RSTAT_HAVE_MASK;
return 0;
}
return result_status = (result_status & ~PG_RSTAT_HAVE_MASK) | PG_RSTAT_HAVE_ROW;
case 'I':
if (pqSkipnchar(msgLen)) goto read_error;
setMsg_P(EM_EMPTY, PG_RSTAT_HAVE_ERROR);
return result_status;
default:
setMsg_P(EM_SYNC, PG_RSTAT_HAVE_ERROR);
conn_status = CONNECTION_BAD;
return -1;
}
oom:
setMsg_P(EM_OOM, PG_RSTAT_HAVE_ERROR);
read_error:
if (!(result_status & PG_RSTAT_HAVE_ERROR)) {
setMsg_P(EM_READ, PG_RSTAT_HAVE_ERROR);
}
conn_status = CONNECTION_BAD;
return -1;
}
int PGconnection::executeFormat(int progmem, const char *format, ...)
{
int32_t msgLen;
va_list va;
va_start(va, format);
msgLen = writeFormattedQuery(0, progmem, format, va);
va_end(va);
if (msgLen < 0) return -1;
va_start(va, format);
msgLen = writeFormattedQuery(msgLen, progmem, format, va);
va_end(va);
if (msgLen) {
return -1;
}
result_status = PG_RSTAT_COMMAND_SENT;
return 0;
}
#ifdef ESP8266
// there is no strchr_P in ESP8266 ROM :(
static const char *strchr_P(const char *str, char c)
{
char z;
for (;;) {
z = pgm_read_byte(str);
if (!z) return NULL;
if (z == c) return str;
str++;
}
}
#endif
int PGconnection::build_startup_packet(
char *packet,
const char *db,
const char *charset)
{
int packet_len = 4;
if (packet) {
memcpy(packet,"\0\003\0\0", 4);
}
#define ADD_STARTUP_OPTION(optname, optval) \
do { \
if (packet) \
strcpy_P(packet + packet_len, (char *)optname); \
packet_len += strlen_P((char *)optname) + 1; \
if (packet) \
strcpy(packet + packet_len, (char *)optval); \
packet_len += strlen((char *)optval) + 1; \
} while(0)
#define ADD_STARTUP_OPTION_P(optname, optval) \
do { \
if (packet) \
strcpy_P(packet + packet_len, (char *)optname); \
packet_len += strlen_P((char *)optname) + 1; \
if (packet) \
strcpy_P(packet + packet_len, (char *)optval); \
packet_len += strlen_P((char *)optval) + 1; \
} while(0)
if (_user && _user[0])
ADD_STARTUP_OPTION(PSTR("user"), _user);
if (db && db[0])
ADD_STARTUP_OPTION(PSTR("database"), db);
if (charset && charset[0])
ADD_STARTUP_OPTION(PSTR("client_encoding"), charset);
ADD_STARTUP_OPTION_P(PSTR("application_name"), PSTR("arduino"));
#undef ADD_STARTUP_OPTION
if (packet)
packet[packet_len] = '\0';
packet_len++;
return packet_len;
}
int PGconnection::pqPacketSend(char pack_type, const char *buf, int buf_len, int progmem)
{
char *start = Buffer;
int l = bufSize - 4;
int n;
if (pack_type) {
*start++ = pack_type;
l--;
}
*start++ = ((buf_len + 4) >> 24) & 0xff;
*start++ = ((buf_len + 4) >> 16) & 0xff;
*start++ = ((buf_len + 4) >> 8) & 0xff;
*start++ = (buf_len + 4) & 0xff;
if (progmem) {
while (buf_len > 0) {
while (buf_len > 0 && l > 0) {
*start++ = pgm_read_byte(buf++);
buf_len--;
}
n = client->write((const uint8_t *)Buffer, start - Buffer);
if (n != start - Buffer) return -1;
start = Buffer;
l = bufSize;
}
}
else {
if (buf) {
if (buf_len <= l) {
memcpy(start, buf, buf_len);
start += buf_len;
buf_len = 0;
}
else {
memcpy(start, buf, l);
start += l;
buf_len -= l;
buf += l;
}
}
n = client->write((const uint8_t *)Buffer, start - Buffer);
if (n != start - Buffer) return -1;
if (buf && buf_len) {
n = client->write((const uint8_t *)buf, buf_len);
if (n != buf_len) return -1;
}
}
return 0;
}
int PGconnection::pqGetc(char *buf)
{
int i;
for (i=0; !client->available() && i < 10; i++) {
delay (i * 10 + 10);
}
if (!client->available()) {
return -1;
}
*buf = client->read();
return 0;
}
int PGconnection::pqGetInt4(int32_t *result)
{
uint32_t tmp4 = 0;
byte tmp,i;
for (i = 0; i < 4; i++) {
if (pqGetc((char *)&tmp)) return -1;
tmp4 = (tmp4 << 8) | tmp;
}
*result = tmp4;
return 0;
}
int PGconnection::pqGetInt2(int16_t *result)
{
uint16_t tmp2 = 0;
byte tmp,i;
for (i = 0; i < 2; i++) {
if (pqGetc((char *)&tmp)) return -1;
tmp2 = (tmp2 << 8) | tmp;
}
*result = tmp2;
return 0;
}
int PGconnection::pqGetnchar(char *s, int len)
{
while (len-- > 0) {
if (pqGetc(s++)) return -1;
}
return 0;
}
int PGconnection::pqGets(char *s, int maxlen)
{
int len;
char z;
for (len = 0;len < maxlen; len++) {
if (pqGetc(&z)) return -1;
if (s) *s++ = z;
if (!z) return len+1;
}
return - (len + 1);
}
int PGconnection::pqSkipnchar(int len)
{
char dummy;
while (len-- > 0) {
if (pqGetc(&dummy)) return -1;
}
return 0;
}
int PGconnection::pqGetRow(void)
{
int i;
int bufpos = 0;
int32_t len;
int16_t cols;
_null = 0;
if (pqGetInt2(&cols)) return -1;
if (cols != _nfields) {
return -3;
}
for (i=0; i < _nfields; i++) {
if (pqGetInt4(&len)) return -1;
if (len < 0) {
_null |= 1<<i;
continue;
}
if (bufpos + len + 1 > bufSize) {
return -2;
}
if (pqGetnchar(Buffer + bufpos, len)) return -1;
bufpos += len;
Buffer[bufpos++]=0;
}
return 0;
}
int PGconnection::pqGetRowDescriptions(void)
{
int i;
int16_t format;
int rc;
int bufpos;
if (pqGetInt2(&_nfields)) return -1;
if (_nfields > PG_MAX_FIELDS) return -2; // implementation limit
_formats = 0;
bufpos = 0;
for (i = 0;i < _nfields; i++) {
if (!(_flags & PG_FLAG_IGNORE_COLUMNS)) {
if (bufpos >= bufSize - 1) return -2;
rc = pqGets(Buffer + bufpos, bufSize - bufpos);
if (rc < 0) return -1;
bufpos += rc;
}
else {
if (pqGets(NULL, 8192) < 0) {
return -1;
}
}
if (pqSkipnchar(16)) return -1;
if (pqGetInt2(&format)) return -1;
format = format ? 1 : 0;
_formats |= format << i;
}
if (_formats) return -3;
return 0;
}
void PGconnection::setMsg(const char *s, int type)
{
strcpy(Buffer, s);
result_status = (result_status & ~PG_RSTAT_HAVE_MASK) | type;
}
void PGconnection::setMsg_P(const char *s, int type)
{
strcpy_P(Buffer, s);
result_status = (result_status & ~PG_RSTAT_HAVE_MASK) | type;
}
int PGconnection::pqGetNotice(int type)
{
int bufpos = 0;
char id;
int rc;
for (;;) {
if (pqGetc(&id)) goto read_error;
if (!id) break;
if (id == 'S' || id == 'M') {
if (bufpos && bufpos < bufSize - 1) Buffer[bufpos++]=':';
rc = pqGets(Buffer + bufpos, bufSize - bufpos);
if (rc < 0) goto read_error;
bufpos += rc -1;
}
else {
rc = pqGets(NULL, 8192);
if (rc < 0) goto read_error;
}
}
Buffer[bufpos] = 0;
result_status = (result_status & ~PG_RSTAT_HAVE_MASK) | type;
return 0;
read_error:
if (!bufpos) setMsg_P(EM_READ, PG_RSTAT_HAVE_ERROR);
return -1;
}
int PGconnection::pqGetNotify(int32_t msgLen)
{
int32_t pid;
int bufpos, i;
if (pqGetInt4(&pid)) return -1;
msgLen -= 4;
bufpos = sprintf(Buffer,"%d:",pid);
if (msgLen > bufSize - (bufpos + 1)) {
if (pqGetnchar(Buffer+bufpos, bufSize - (bufpos + 1)))
return -1;
msgLen -= bufSize - (bufpos + 1);
if (pqSkipnchar(msgLen)) return -1;
Buffer[msgLen = bufSize - 1] = 0;
}
else {
if (pqGetnchar(Buffer+ bufpos, msgLen)) return -1;
Buffer[bufpos + msgLen] = 0;
msgLen += bufpos;
}
for (i=0; i<msgLen; i++) if (!Buffer[i]) Buffer[i] = ':';
return 0;
}
int PGconnection::writeMsgPart_P(const char *s, int len, int fine)
{
while (len > 0) {
if (bufPos >= bufSize) {
if (client->write((uint8_t *)Buffer, bufPos) != (size_t)bufPos) {
return -1;
}
bufPos = 0;
}
Buffer[bufPos++] = pgm_read_byte(s++);
len--;
}
if (bufPos && fine) {
if (client->write((uint8_t *)Buffer, bufPos) != (size_t)bufPos) {
return -1;
}
bufPos = 0;
}
return 0;
}
int PGconnection::writeMsgPart(const char *s, int len, int fine)
{
while (len > 0) {
int n = len;
if (n > bufSize - bufPos) n = bufSize - bufPos;
memcpy(Buffer + bufPos, s, n);
bufPos += n;
s += n;
len -= n;
if (bufPos >= bufSize) {
if (client->write((uint8_t *)Buffer, bufPos) != (size_t)bufPos) {
return -1;
}
bufPos = 0;
}
}
if (bufPos && fine) {
if (client->write((uint8_t *)Buffer, bufPos) != (size_t)bufPos) {
return -1;
}
bufPos = 0;
}
return 0;
}
int32_t PGconnection::writeFormattedQuery(int32_t length, int progmem, const char *format, va_list va)
{
int32_t msgLen = 0;
const char *percent;
int blen, rc;
char buf[32], znak;
if (length) {
length += 4;
bufPos = 0;
Buffer[bufPos++] = 'Q';
Buffer[bufPos++] = (length >> 24) & 0xff;
Buffer[bufPos++] = (length >> 16) & 0xff;
Buffer[bufPos++] = (length >> 8) & 0xff;
Buffer[bufPos++] = (length) & 0xff;
}
for (;;) {
if (progmem) {
percent = strchr_P(format, '%');
}
else {
percent = strchr(format, '%');
}
if (!percent) break;
if (progmem) {
znak = pgm_read_byte(percent+1);
}
else {
znak = percent[1];
}
if (!length) {
msgLen += (percent - format);
}
else {
if (progmem) {
rc = writeMsgPart_P(format, percent - format, false);
}
else {
rc = writeMsgPart(format, percent - format, false);
}
if (rc) goto write_error;
}
format = percent + 2;
if (znak == 's' || znak == 'n') {
char *str = va_arg(va, char *);
blen = (znak == 's') ? escapeString(str, NULL) : escapeName(str, NULL);
if (!length) {
msgLen += blen;
}
else {
if (bufPos + blen > bufSize) {
rc = writeMsgPart(NULL, 0, true);
if (rc) goto write_error;
}
}
if (znak == 's') {
escapeString(str, Buffer + bufPos);
}
else {
escapeName(str, Buffer + bufPos);
}
bufPos += blen;
continue;
}
if (znak == 'l' || znak == 'd') {
if (znak == 'l') {
long n = va_arg(va, long);
blen = snprintf(buf, 32, "'%ld'", n);
}
else {
int n = va_arg(va, int);
blen = snprintf(buf, 32, "'%d'", n);
}
if (length) {
rc = writeMsgPart(buf, blen, false);
if (rc) goto write_error;
}
else {
msgLen += blen;
}
}
setMsg_P(EM_FORMAT, PG_RSTAT_HAVE_ERROR);
return -1;
}
if (progmem) {
blen = strlen_P(format);
}
else {
blen = strlen(format);
}
if (length) {
if (progmem) {
rc = writeMsgPart_P(format, blen, false);
}
else {
rc = writeMsgPart(format, blen, false);
}
if (!rc) {
rc = writeMsgPart("\0",1,true);
}
if (rc) goto write_error;
}
else {
msgLen += blen + 1;
}
return msgLen;
write_error:
setMsg_P(EM_WRITE, PG_RSTAT_HAVE_ERROR);
conn_status = CONNECTION_BAD;
return -1;
}
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