From 012f9e4156919157bfff0d5ce8f105a04b0c4a70 Mon Sep 17 00:00:00 2001
From: tomsmeding <tom.smeding@gmail.com>
Date: Fri, 17 Mar 2017 23:16:21 +0100
Subject: client: Start working on a simple client

---
 client/.gitignore |   1 +
 client/Makefile   |  30 ++++
 client/client.c   | 418 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 client/global.c   |  33 +++++
 client/global.h   |  14 ++
 client/memory.c   |  16 +++
 client/memory.h   |  15 ++
 7 files changed, 527 insertions(+)
 create mode 100644 client/.gitignore
 create mode 100644 client/Makefile
 create mode 100644 client/client.c
 create mode 100644 client/global.c
 create mode 100644 client/global.h
 create mode 100644 client/memory.c
 create mode 100644 client/memory.h

(limited to 'client')

diff --git a/client/.gitignore b/client/.gitignore
new file mode 100644
index 0000000..b051c6c
--- /dev/null
+++ b/client/.gitignore
@@ -0,0 +1 @@
+client
diff --git a/client/Makefile b/client/Makefile
new file mode 100644
index 0000000..e9bbb91
--- /dev/null
+++ b/client/Makefile
@@ -0,0 +1,30 @@
+CC = gcc
+CFLAGS = -Wall -Wextra -std=c11 -g -fwrapv -I$(TERMIO)/include
+LDFLAGS = -L$(TERMIO)/lib -ltermio
+
+TERMIO = $(HOME)/prefix
+
+TARGETS = client
+
+.PHONY: all clean remake
+
+# Clear all implicit suffix rules
+.SUFFIXES:
+
+# Don't delete intermediate files
+.SECONDARY:
+
+all: $(TARGETS)
+
+clean:
+	rm -f $(TARGETS) *.o
+
+remake: clean
+	$(MAKE) all
+
+
+$(TARGETS): $(patsubst %.c,%.o,$(wildcard *.c))
+	$(CC) -o $@ $^ $(LDFLAGS)
+
+%.o: %.c $(wildcard *.h)
+	$(CC) $(CFLAGS) -c -o $@ $<
diff --git a/client/client.c b/client/client.c
new file mode 100644
index 0000000..6609f89
--- /dev/null
+++ b/client/client.c
@@ -0,0 +1,418 @@
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <stdarg.h>
+#include <string.h>
+#include <sys/select.h>
+#include <sys/socket.h>
+#include <netdb.h>
+#include <unistd.h>
+#include <errno.h>
+#include <assert.h>
+#include <termio.h>
+#include "global.h"
+
+
+static const Style normal_style={9,9,false,false};
+static const Style bold_style={9,9,true,false};
+static const Style command_style={3,9,false,false};
+static const Style server_style={6,9,false,false};
+static const Style error_style={1,9,true,false};
+
+
+static i64 uniqid(void){
+	static i64 id=1;
+	return id++;
+}
+
+static ssize_t send_all(int socket,const void *buffer,i64 length){
+	ssize_t cursor=0;
+	while(cursor<length){
+		ssize_t nwr=send(socket,buffer+cursor,length-cursor,0);
+		if(nwr<=0)return nwr;
+		cursor+=nwr;
+	}
+	return cursor;
+}
+
+
+static int connect_server(const char *hostname,int port){
+	struct addrinfo hints,*res;
+
+	memset(&hints,0,sizeof(hints));
+	hints.ai_family=AF_UNSPEC;
+	hints.ai_socktype=SOCK_STREAM;
+
+	char portbuf[16];
+	snprintf(portbuf,16,"%d",port);
+	int ret=getaddrinfo(hostname,portbuf,&hints,&res);
+	if(ret!=0){
+		fprintf(stderr,"getaddrinfo: %s\n",gai_strerror(ret));
+		exit(1);
+	}
+
+	int sock;
+	struct addrinfo *current=res;
+	while(current){
+		sock=socket(res->ai_family,res->ai_socktype,res->ai_protocol);
+		if(sock!=-1){
+			if(connect(sock,res->ai_addr,res->ai_addrlen)==0){
+				break;
+			}
+		}
+		close(sock);
+		sock=-1;
+		current=current->ai_next;
+	}
+	freeaddrinfo(res);
+
+	return sock;
+}
+
+static bool termio_needs_reset=false;
+
+static void termio_reset(void){
+	if(!termio_needs_reset)return;
+	endkeyboard();
+	endscreen();
+	termio_needs_reset=false;
+}
+
+static void termio_init(void){
+	initscreen();
+	initkeyboard(false);
+	installCLhandler(true);
+	atexit(termio_reset);
+	termio_needs_reset=true;
+}
+
+
+static i64 bar_width=11;
+
+static char *user_buffer=NULL;
+static i64 user_bufsz=0;
+static i64 user_buflen=0;
+
+static int server_sock=-1;
+
+
+enum log_type{
+	LOG_MESSAGE,
+	LOG_SERVER,
+	LOG_COMMAND,
+	LOG_ERROR,
+};
+
+static void emit_log_line(enum log_type type,const char *head,const char *line){
+	i64 headlen=strlen(head);
+	if(headlen+1>bar_width){
+		bar_width=headlen+1;
+	}
+	Size termsize=gettermsize();
+	assert(termsize.w>bar_width);
+
+	i64 linelen=strlen(line);
+	i64 nlines=1,cursor=termsize.w-bar_width;
+	while(cursor<linelen){
+		cursor+=termsize.w-bar_width;
+		nlines++;
+	}
+
+	scrollterm(0,1,termsize.w,termsize.h-2,nlines);
+
+	char buffer[termsize.w+1];
+
+	switch(type){
+		case LOG_MESSAGE: setstyle(&normal_style); break;
+		case LOG_SERVER: setstyle(&server_style); break;
+		case LOG_COMMAND: setstyle(&command_style); break;
+		case LOG_ERROR: setstyle(&error_style); break;
+	}
+
+	pushcursor();
+	moveto(bar_width-1-headlen,termsize.h-1-nlines);
+	tprintf("%s",head);
+	cursor=0;
+	for(int y=0;y<nlines;y++){
+		memcpy(buffer,line+cursor,termsize.w-bar_width);
+		buffer[termsize.w-bar_width]='\0';
+
+		moveto(bar_width,termsize.h-1-nlines);
+		tprintf("%s",buffer);
+
+		cursor+=termsize.w-bar_width;
+	}
+	popcursor();
+	redraw();
+}
+
+__attribute__((format (printf, 3, 4)))
+static void emit_log_line_f(enum log_type type,const char *head,const char *format,...){
+	va_list ap;
+	va_start(ap,format);
+	char *buf=NULL;
+	vasprintf(&buf,format,ap);
+	va_end(ap);
+	assert(buf);
+	emit_log_line(type,head,buf);
+	free(buf);
+}
+
+static void redraw_prompt(void){
+	Size termsize=gettermsize();
+	moveto(0,termsize.h-1);
+	setstyle(&bold_style);
+	tprintf("> ");
+
+	setstyle(&normal_style);
+	fillrect(2,termsize.h-1,termsize.w-2,1,' ');
+	tprintf("%s",user_buffer);
+	redraw();
+}
+
+
+static char *server_user=NULL;
+static char *server_room=NULL;
+
+static void send_message(const char *msg){
+	if(server_user==NULL){
+		emit_log_line(LOG_ERROR,"--","Cannot send messages while not logged in");
+		return;
+	}
+	if(server_room==NULL){
+		emit_log_line(LOG_ERROR,"--","Cannot send messages while not in a room");
+		return;
+	}
+}
+
+static void cmd_register(const char **args){
+	emit_log_line_f(LOG_COMMAND,"##","/register %s %s",args[0],args[1]);
+}
+
+static void cmd_login(const char **args){
+	emit_log_line_f(LOG_COMMAND,"##","Login called with %s and %s",args[0],args[1]);
+}
+
+static void cmd_quit(const char **args){
+	close(server_sock);
+	exit(0);
+}
+
+struct cmd_list_item{
+	const char *name;
+	int nargs;
+	bool longlast;
+	void (*func)(const char **args);
+};
+
+static struct cmd_list_item cmd_list[]={
+	{"register",2,true,cmd_register},
+	{"login",2,true,cmd_login},
+	{"quit",0,false,cmd_quit},
+};
+#define NCOMMANDS ((i64)(sizeof(cmd_list)/sizeof(cmd_list[0])))
+
+static void execute_command(char *line){
+	if(line[0]=='/'){
+		send_message(line);
+		return;
+	}
+
+	i64 linelen=strlen(line);
+	char *sepp=memchr(line,' ',linelen);
+	if(sepp==NULL)sepp=line+linelen;
+	*sepp='\0';
+	i64 cmdlen=sepp-line;
+	i64 cmdi;
+	for(cmdi=0;cmdi<NCOMMANDS;cmdi++){
+		if(strncmp(line,cmd_list[cmdi].name,cmdlen)==0){
+			break;
+		}
+	}
+
+	if(cmdi==NCOMMANDS){
+		emit_log_line_f(LOG_ERROR,"--","Unknown command '%s'",line);
+		return;
+	}
+
+	int nargs=cmd_list[cmdi].nargs;
+	char *args[nargs];
+	i64 cursor=cmdlen+1;
+	while(line[cursor]==' ')cursor++;
+
+	for(int i=0;i<nargs;i++){
+		if(cursor>linelen){
+			emit_log_line_f(LOG_ERROR,"--","Too few parameters to command '%s'",line);
+			return;
+		}
+		if(i==nargs-1&&cmd_list[cmdi].longlast){
+			sepp=line+linelen;
+		} else {
+			sepp=memchr(line+cursor,' ',linelen-cursor);
+			if(sepp==NULL)sepp=line+linelen;
+		}
+		*sepp='\0';
+		args[i]=line+cursor;
+		cursor=sepp-line+1;
+		while(line[cursor]==' ')cursor++;
+	}
+	if(sepp-line<linelen){
+		emit_log_line_f(LOG_ERROR,"--","Too many parameters to command '%s'",line);
+		return;
+	}
+
+	cmd_list[cmdi].func((const char**)args);
+}
+
+
+// Returns whether stdin was closed
+static bool handle_stdin(void){
+	int key=tgetkey();
+	switch(key){
+		case KEY_LF:
+		case KEY_CR: {
+			if(user_buffer[0]=='/'){
+				execute_command(user_buffer+1);
+			} else {
+				send_message(user_buffer);
+			}
+			user_buflen=0;
+			user_buffer[0]='\0';
+			redraw_prompt();
+			break;
+		}
+
+		case KEY_BACKSPACE:
+			if(user_buflen>0){
+				user_buflen--;
+				user_buffer[user_buflen]='\0';
+				redraw_prompt();
+			} else {
+				bel();
+			}
+			break;
+
+		case KEY_CTRL+'U':
+			user_buflen=0;
+			user_buffer[0]='\0';
+			redraw_prompt();
+			break;
+
+		default:
+			if(key>=32&&key<=126){
+				if(user_buflen==user_bufsz-1){
+					user_bufsz*=2;
+					user_buffer=realloc(user_buffer,user_bufsz,char);
+				}
+				user_buffer[user_buflen++]=key;
+				user_buffer[user_buflen]='\0';
+				redraw_prompt();
+			} else {
+				bel();
+			}
+			break;
+	}
+	return false;
+}
+
+// Returns whether socket was closed
+static bool handle_server(void){
+	static i64 bufsz=256,buflen=0;
+	static char *buffer=NULL;
+	if(buffer==NULL){
+		buffer=malloc(bufsz,char);
+	}
+
+	if(bufsz-buflen<128){
+		bufsz*=2;
+		buffer=realloc(buffer,bufsz,char);
+	}
+
+	ssize_t nr;
+	while(true){
+		nr=read(server_sock,buffer+buflen,bufsz-buflen);
+		if(nr<0){
+			if(errno==EINTR)continue;
+			if(errno==ECONNRESET){
+				buflen=0;
+				return true;
+			}
+			perror("read");
+			exit(1);
+		}
+		if(nr==0){
+			buflen=0;
+			return true;
+		}
+		buflen+=nr;
+		break;
+	}
+
+	char *lfp=memchr(buffer,'\n',buflen);
+	if(lfp==NULL)return false;
+	*lfp='\0';
+	emit_log_line(LOG_SERVER,">>",buffer);
+	i64 linelen=lfp-buffer;
+	memmove(buffer,buffer+linelen+1,buflen-linelen-1);
+	buflen-=linelen+1;
+	return false;
+}
+
+
+int main(int argc,char **argv){
+	const char *hostname="tomsmeding.com";
+	int port=29536;
+
+	if(argc>=2){
+		hostname=argv[1];
+		if(argc>=3){
+			port=strtol(argv[2],NULL,10);
+			if(argc>=4){
+				fprintf(stderr,"Usage: %s [host [port]]\n",argv[0]);
+				return 1;
+			}
+		}
+	}
+
+	server_sock=connect_server(hostname,port);
+	if(server_sock==-1){
+		fprintf(stderr,"Could not connect to %s port %d\n",hostname,port);
+		return 1;
+	}
+
+	termio_init();
+
+	clearscreen();
+	moveto(0,0);
+	setstyle(&bold_style);
+	tprintf("TOMSG CLIENT");
+
+	user_bufsz=256;
+	user_buflen=0;
+	user_buffer=malloc(user_bufsz,char);
+
+	redraw_prompt();
+
+	while(true){
+		fd_set inset;
+		FD_ZERO(&inset);
+		FD_SET(STDIN_FILENO,&inset);
+		FD_SET(server_sock,&inset);
+		int ret=select(server_sock+1,&inset,NULL,NULL,NULL);
+		if(ret==-1){
+			if(errno==EINTR)continue;
+			perror("select");
+			return 1;
+		}
+		if(FD_ISSET(STDIN_FILENO,&inset)){
+			if(handle_stdin())break;
+		}
+		if(FD_ISSET(server_sock,&inset)){
+			if(handle_server())break;
+		}
+	}
+
+	close(server_sock);
+	termio_reset();
+}
diff --git a/client/global.c b/client/global.c
new file mode 100644
index 0000000..bf5bf2e
--- /dev/null
+++ b/client/global.c
@@ -0,0 +1,33 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdarg.h>
+#include <errno.h>
+#include "global.h"
+
+__attribute__((noreturn, format(printf, 1, 2)))
+void die(const char *format,...){
+	fprintf(stderr,"DIE: ");
+	va_list ap;
+	va_start(ap,format);
+	vfprintf(stderr,format,ap);
+	va_end(ap);
+	fputc('\n',stderr);
+	exit(1);
+}
+
+__attribute__((noreturn))
+void die_perror(const char *func){
+	fprintf(stderr,"DIE: %s: %s\n",func,strerror(errno));
+	exit(1);
+}
+
+__attribute__((format (printf, 1, 2)))
+void debug(const char *format,...){
+	fprintf(stderr,"DEBUG: ");
+	va_list ap;
+	va_start(ap,format);
+	vfprintf(stderr,format,ap);
+	va_end(ap);
+	fputc('\n',stderr);
+}
diff --git a/client/global.h b/client/global.h
new file mode 100644
index 0000000..de0873b
--- /dev/null
+++ b/client/global.h
@@ -0,0 +1,14 @@
+#pragma once
+
+#include <stdbool.h>
+#include <stdint.h>
+#include <inttypes.h>
+#include "memory.h"
+
+typedef int64_t i64;
+typedef uint64_t u64;
+
+void die(const char *format,...) __attribute__((noreturn, format(printf, 1, 2)));
+void die_perror(const char *func) __attribute__((noreturn));
+
+void debug(const char *format,...) __attribute__((format(printf, 1, 2)));
diff --git a/client/memory.c b/client/memory.c
new file mode 100644
index 0000000..aec3da2
--- /dev/null
+++ b/client/memory.c
@@ -0,0 +1,16 @@
+#include "global.h"
+#include "memory.h"
+
+void* check_after_allocation(const char *func,size_t num,size_t sz,void *ptr){
+	if(ptr==NULL){
+		die("Allocation failed: %s(%zu * %zuB = %zu)",func,num,sz,num*sz);
+	}
+	return ptr;
+}
+
+void* check_after_allocation_str(const char *func,void *ptr){
+	if(ptr==NULL){
+		die("Allocation failed: %s()",func);
+	}
+	return ptr;
+}
diff --git a/client/memory.h b/client/memory.h
new file mode 100644
index 0000000..19cfb95
--- /dev/null
+++ b/client/memory.h
@@ -0,0 +1,15 @@
+#pragma once
+
+#include <stdlib.h>
+
+#define malloc(num,type) \
+	((type*)check_after_allocation("malloc",num,sizeof(type),malloc((num)*sizeof(type))))
+#define calloc(num,type) \
+	((type*)check_after_allocation("calloc",num,sizeof(type),calloc((num),sizeof(type))))
+#define realloc(ptr,num,type) \
+	((type*)check_after_allocation("realloc",num,sizeof(type),realloc((ptr),(num)*sizeof(type))))
+#define strdup(str) \
+	((char*)check_after_allocation_str("strdup",strdup(str)))
+
+void* check_after_allocation(const char *func,size_t num,size_t sz,void *ptr);
+void* check_after_allocation_str(const char *func,void *ptr);
-- 
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