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smallchat-client.c
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smallchat-client.c
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/* smallchat-client.c -- Client program for smallchat-server.
*
* Copyright (c) 2023, Salvatore Sanfilippo <antirez at gmail dot com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the project name of nor the names of its contributors may be used
* to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <assert.h>
#include <errno.h>
#include <io.h>
#include <winsock.h>
#include <Windows.h>
#include "chatlib.h"
/* ============================================================================
* Low level terminal handling.
* ========================================================================== */
void disableRawModeAtExit(void);
/* Raw mode: 1960 magic shit. */
int setRawMode(HANDLE fd, int enable) {
#if 0
/* We have a bit of global state (but local in scope) here.
* This is needed to correctly set/undo raw mode. */
static struct termios orig_termios; // Save original terminal status here.
static int atexit_registered = 0; // Avoid registering atexit() many times.
static int rawmode_is_set = 0; // True if raw mode was enabled.
struct termios raw;
/* If enable is zero, we just have to disable raw mode if it is
* currently set. */
if (enable == 0) {
/* Don't even check the return value as it's too late. */
if (rawmode_is_set && tcsetattr(fd,TCSAFLUSH,&orig_termios) != -1)
rawmode_is_set = 0;
return 0;
}
/* Enable raw mode. */
if (!isatty(fd)) goto fatal;
if (!atexit_registered) {
atexit(disableRawModeAtExit);
atexit_registered = 1;
}
if (tcgetattr(fd,&orig_termios) == -1) goto fatal;
raw = orig_termios; /* modify the original mode */
/* input modes: no break, no CR to NL, no parity check, no strip char,
* no start/stop output control. */
raw.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
/* output modes - do nothing. We want post processing enabled so that
* \n will be automatically translated to \r\n. */
// raw.c_oflag &= ...
/* control modes - set 8 bit chars */
raw.c_cflag |= (CS8);
/* local modes - choing off, canonical off, no extended functions,
* but take signal chars (^Z,^C) enabled. */
raw.c_lflag &= ~(ECHO | ICANON | IEXTEN);
/* control chars - set return condition: min number of bytes and timer.
* We want read to return every single byte, without timeout. */
raw.c_cc[VMIN] = 1; raw.c_cc[VTIME] = 0; /* 1 byte, no timer */
/* put terminal in raw mode after flushing */
if (tcsetattr(fd,TCSAFLUSH,&raw) < 0) goto fatal;
rawmode_is_set = 1;
return 0;
fatal:
errno = ENOTTY;
return -1;
#else
/* We have a bit of global state (but local in scope) here.
* This is needed to correctly set/undo raw mode. */
static DWORD orig_mode;
static int atexit_registered = 0; // Avoid registering atexit() many times.
static int rawmode_is_set = 0; // True if raw mode was enabled.
DWORD mode;
/* If enable is zero, we just have to disable raw mode if it is
* currently set. */
if (enable == 0) {
/* Don't even check the return value as it's too late. */
if (rawmode_is_set && SetConsoleMode(fd, orig_mode) != 0)
rawmode_is_set = 0;
return 0;
}
/* Enable raw mode. */
// if (!_isatty(fd)) goto fatal;
if (!atexit_registered) {
atexit(disableRawModeAtExit);
atexit_registered = 1;
}
if (GetConsoleMode(fd,&orig_mode) == -1) return -1;
/* input modes: no break, no CR to NL, no parity check, no strip char,
* no start/stop output control. */
mode = orig_mode;
mode &= ~(ENABLE_MOUSE_INPUT | ENABLE_LINE_INPUT | ENABLE_ECHO_INPUT | ENABLE_WINDOW_INPUT);
/* put terminal in raw mode */
if (SetConsoleMode(fd, mode) == 0) return -1;
FlushConsoleInputBuffer(fd);
rawmode_is_set = 1;
return 0;
// fatal:
// errno = ENOTTY;
// return -1;
// GetConsoleMode(fd, &mode);
// if(!SetConsoleMode(fd, 0)) {
// }
#endif
}
/* At exit we'll try to fix the terminal to the initial conditions. */
void disableRawModeAtExit(void) {
HANDLE hStdIn = GetStdHandle(STD_INPUT_HANDLE);
setRawMode(hStdIn,0);
}
/* ============================================================================
* Mininal line editing.
* ========================================================================== */
void terminalCleanCurrentLine(void) {
HANDLE hStdOut = GetStdHandle(STD_OUTPUT_HANDLE);
// WriteFile(hStdOut, "\e[2K", 4, NULL, NULL);
// write(fileno(stdout),"\e[2K",4);
}
void terminalCursorAtLineStart(void) {
// write(fileno(stdout),"\r",1);
HANDLE hStdOut = GetStdHandle(STD_OUTPUT_HANDLE);
WriteFile(hStdOut, "\r", 1, NULL, NULL);
}
#define IB_MAX 128
struct InputBuffer {
char buf[IB_MAX]; // Buffer holding the data.
int len; // Current length.
};
/* inputBuffer*() return values: */
#define IB_ERR 0 // Sorry, unable to comply.
#define IB_OK 1 // Ok, got the new char, did the operation, ...
#define IB_GOTLINE 2 // Hey, now there is a well formed line to read.
/* Append the specified character to the buffer. */
int inputBufferAppend(struct InputBuffer *ib, int c) {
if (ib->len >= IB_MAX) return IB_ERR; // No room.
ib->buf[ib->len] = c;
ib->len++;
return IB_OK;
}
void inputBufferHide(struct InputBuffer *ib);
void inputBufferShow(struct InputBuffer *ib);
/* Process every new keystroke arriving from the keyboard. As a side effect
* the input buffer state is modified in order to reflect the current line
* the user is typing, so that reading the input buffer 'buf' for 'len'
* bytes will contain it. */
int inputBufferFeedChar(struct InputBuffer *ib, int c) {
switch(c) {
case '\n':
break; // Ignored. We handle \r instead.
case '\r':
return IB_GOTLINE;
case 127: // Backspace.
if (ib->len > 0) {
ib->len--;
inputBufferHide(ib);
inputBufferShow(ib);
}
break;
default:
if (inputBufferAppend(ib,c) == IB_OK)
write(fileno(stdout),ib->buf+ib->len-1,1);
break;
}
return IB_OK;
}
/* Hide the line the user is typing. */
void inputBufferHide(struct InputBuffer *ib) {
(void)ib; // Not used var, but is conceptually part of the API.
terminalCleanCurrentLine();
terminalCursorAtLineStart();
}
/* Show again the current line. Usually called after InputBufferHide(). */
void inputBufferShow(struct InputBuffer *ib) {
write(fileno(stdout),ib->buf,ib->len);
}
/* Reset the buffer to be empty. */
void inputBufferClear(struct InputBuffer *ib) {
ib->len = 0;
inputBufferHide(ib);
}
/* =============================================================================
* Main program logic, finally :)
* ========================================================================== */
int main(int argc, char **argv) {
if (argc != 3) {
printf("Usage: %s <host> <port>\n", argv[0]);
exit(1);
}
if(initWSA() != 0) {
exit(1);
}
/* Create a TCP connection with the server. */
int s = TCPConnect(argv[1],atoi(argv[2]),0);
if (s == -1) {
perror("Connecting to server");
exit(1);
}
/* Put the terminal in raw mode: this way we will receive every
* single key stroke as soon as the user types it. No buffering
* nor translation of escape sequences of any kind. */
setRawMode(GetStdHandle(STD_INPUT_HANDLE),1);
fd_set readfds;
struct InputBuffer ib;
inputBufferClear(&ib);
HANDLE hStdOut = GetStdHandle(STD_OUTPUT_HANDLE);
HANDLE hStdIn = GetStdHandle(STD_INPUT_HANDLE);
struct timeval timeout;
timeout.tv_sec = 0;
timeout.tv_usec = 0;
while(1) {
FD_ZERO(&readfds);
FD_SET(s, &readfds);
int maxfd = s;
char buf[128]; /* Generic buffer for both code paths. */
DWORD dwBuff = 128;
DWORD dwRead = 0;
DWORD res = WaitForSingleObject(hStdIn, 10);
DWORD ret;
switch (res)
{
case WAIT_OBJECT_0: // stdin
/* code */
ret = ReadConsole(hStdIn, buf, dwBuff, &dwRead, NULL);
if (ret == 0) {
printf("Error: %d\n", GetLastError());
} else {
for (int j = 0; j < dwRead; ++j) {
int res = inputBufferFeedChar(&ib, buf[j]);
switch (res)
{
case IB_GOTLINE:
inputBufferAppend(&ib,'\n');
inputBufferHide(&ib);
WriteFile(hStdOut,"you> ", 5, NULL, NULL);
WriteFile(hStdOut,ib.buf,ib.len, NULL, NULL);
send(s,ib.buf,ib.len, 0);
inputBufferClear(&ib);
break;
case IB_OK:
break;
}
}
}
break;
case WAIT_TIMEOUT:
break;
case WAIT_FAILED:
printf("Error: %d", GetLastError());
exit(1);
break;
default:
continue;
}
int num_events = select(maxfd+1, &readfds, NULL, NULL, &timeout);
if (num_events == -1) {
perror("select() error");
exit(1);
} else if (num_events) {
char buf[128]; /* Generic buffer for both code paths. */
if (FD_ISSET(s, &readfds)) {
/* Data from the server? */
ssize_t count = recv(s,buf,sizeof(buf), 0);
if (count <= 0) {
printf("Connection lost\n");
exit(1);
}
inputBufferHide(&ib);
// send(fileno(stdout),buf,count, 0);
WriteConsole(hStdOut, buf, count, NULL, NULL);
inputBufferShow(&ib);
}
// else if (FD_ISSET(stdin_fd, &readfds)) {
// /* Data from the user typing on the terminal? */
// ssize_t count = recv(stdin_fd,buf,sizeof(buf), 0);
// for (int j = 0; j < count; j++) {
// int res = inputBufferFeedChar(&ib,buf[j]);
// switch(res) {
// case IB_GOTLINE:
// inputBufferAppend(&ib,'\n');
// inputBufferHide(&ib);
// send(fileno(stdout),"you> ", 5, 0);
// send(fileno(stdout),ib.buf,ib.len, 0);
// send(s,ib.buf,ib.len, 0);
// inputBufferClear(&ib);
// break;
// case IB_OK:
// break;
// }
// }
// }
}
}
closesocket(s);
cleanWSA();
return 0;
}