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#define _POSIX_C_SOURCE 200809L
#include <netdb.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <unistd.h>
#include <libsx.h>
#define BUFSIZE 513 /* IRC max line length is 510 + \r\n + \0 */
struct textpair {
Widget in, out;
};
static int sfd;
int sock_write(int sfd, char *msg, ...){
va_list ap;
va_start(ap, msg);
if (vdprintf(sfd, msg, ap) < 0) {
perror("sock_write");
va_end(ap);
return 1;
}
va_end(ap);
return 0;
}
void
add_text_to_display_newline(char *s, Widget w) {
size_t len;
char *old, *new;
old = GetTextWidgetText(w);
if (old == NULL) {
fprintf(stderr, "error getting old text\n");
exit(1);
}
len = strlen(old);
new = calloc(strlen(s) + len + 2, 1);
if (new == NULL) {
perror("malloc");
exit(1);
}
strcpy(new, old);
if (len > 0 && old[len - 1] != '\n')
strcat(new, "\n");
strcat(new, s);
SetTextWidgetText(w, new, 0);
free(new);
}
void
submit_cb(Widget w, void *d) {
struct textpair *tp = (struct textpair *)d;
char *new;
new = GetTextWidgetText(tp->in);
if (new == NULL) {
fprintf(stderr, "error getting text\n");
exit(1);
}
sock_write(sfd, "%s\r\n", /* TODO: conditionally add \r\n */ new);
add_text_to_display_newline(new, tp->out);
SetStringEntry(tp->in, "");
}
void
string_cb(Widget w, char *s, void *data) {
sock_write(sfd, "%s\r\n", /* TODO: conditionally add \r\n */ s);
add_text_to_display_newline(s, (Widget)data);
SetStringEntry(w, "");
}
void
quit(Widget w, void *d) {
sock_write(sfd, "QUIT :nähdään\r\n");
close(sfd);
exit(0);
}
void
pollin_cb(XtPointer client_data, int *source, XtInputId *id) {
char c[BUFSIZE] = {'\0'};
if (read(*source, c, BUFSIZE) == 0)
XtRemoveInput(*id);
else
add_text_to_display_newline(c, (Widget)client_data);
}
int
setup_sx(int argc, char **argv, XtAppContext *app, Widget *output) {
static struct textpair tp;
static Widget w[4];
if (OpenDisplay(argc, argv) == 0) {
fprintf(stderr, "couldn't open display\n");
return 1;
}
w[0] = MakeTextWidget("", 0, 0, 300, 200);
w[1] = MakeStringEntry(NULL, 200, string_cb, w[0]);
tp.in = w[1];
tp.out = w[0];
*output = w[0];
w[2] = MakeButton("Submit", submit_cb, &tp);
w[3] = MakeButton("Quit", quit, NULL);
SetWidgetPos(w[1], PLACE_UNDER, w[0], NO_CARE, NULL);
SetWidgetPos(w[2], PLACE_RIGHT, w[1], PLACE_UNDER, w[0]);
SetWidgetPos(w[3], PLACE_RIGHT, w[2], PLACE_UNDER, w[0]);
if (!w[0] || !w[1])
return 1;
*app = XtWidgetToApplicationContext(w[0]);
if (*app == NULL)
return 1;
return 0;
}
int
server_connect(char *nodename, char *servname) {
int s, sfd;
struct addrinfo hints = {0}, *result, *rp;
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_PASSIVE;
s = getaddrinfo(nodename, servname, &hints, &result);
if (s != 0) {
fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(s));
return -1;
}
for (rp = result; rp != NULL; rp = rp->ai_next) {
sfd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
if (sfd == -1)
continue;
if (connect(sfd, rp->ai_addr, rp->ai_addrlen) == 0)
break;
if (close(sfd) == -1) {
perror("close");
return -1;
}
}
freeaddrinfo(result);
if (rp == NULL)
return -1;
return sfd;
}
int
setup_irc(int *sockfd) {
/* initially hardcode the user details; TODO make a popup to prompt for them */
char nodename[] = "irc.libera.chat";
char servname[] = "6667";
char nick[] = "sxirc";
int s;
s = server_connect(nodename, servname);
if (s == -1)
return 1;
/* identify */
sock_write(s, "NICK %s\r\nUSER %s 8 x :%s\r\n", nick, nick, nick);
*sockfd = s;
return 0;
}
int
main(int argc, char **argv) {
XtAppContext app;
Widget output;
if (setup_sx(argc, argv, &app, &output) != 0)
return 1;
if (setup_irc(&sfd) != 0)
return 1;
XtAppAddInput(app, sfd, XtInputReadMask, pollin_cb, output);
ShowDisplay();
GetStandardColors();
MainLoop();
return 0;
}
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