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Comments? In /my/ code? It's more likely than you think.

This commit is contained in:
Kevin Lange 2011-12-03 19:49:30 -06:00
parent 93fcebb156
commit cedbee69a2
1 changed files with 143 additions and 58 deletions
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201
src/nyancat.c
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@ -4,6 +4,16 @@
* Developed by: Kevin Lange * Developed by: Kevin Lange
* http://github.com/klange/nyancat * http://github.com/klange/nyancat
* *
* This is a simple telnet server / standalone application which renders the
* classic Nyan Cat (or "poptart cat") to your terminal.
*
* It makes use of various ANSI escape sequences to render color, or in the case
* of a VT220, simply dumps text to the screen.
*
* For more information, please see:
*
* http://miku.acm.uiuc.edu
*
* Permission is hereby granted, free of charge, to any person obtaining a copy * Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to * of this software and associated documentation files (the "Software"), to
* deal with the Software without restriction, including without limitation the * deal with the Software without restriction, including without limitation the
@ -37,54 +47,95 @@
#include <signal.h> #include <signal.h>
#include "telnet.h" #include "telnet.h"
/* The animation frames are stored separately. */
#include "animation.h" #include "animation.h"
/* The color palette is not yet set */
char * colors[256] = {NULL}; char * colors[256] = {NULL};
/*
* For most modes, we ouput spaces, but for some
* we will use block characters.
*/
char * output = " "; char * output = " ";
/*
* These values crop the animation, as we have a full 64x64 stored,
* but we only want to display 80x24.
*/
#define MIN_ROW 20 #define MIN_ROW 20
#define MAX_ROW 44 #define MAX_ROW 44
#define MIN_COL 10 #define MIN_COL 10
#define MAX_COL 50 #define MAX_COL 50
/*
* In the standalone mode, we want to handle an interrupt signal
* (^C) so that we can restore the cursor.
*/
void SIGINT_handler(int sig){ void SIGINT_handler(int sig){
printf("\033[?25h"); printf("\033[?25h");
exit(0); exit(0);
} }
/*
* These are the options we want to use as
* a telnet server. These are set in set_options()
*/
unsigned char telnet_options[256] = { 0 }; unsigned char telnet_options[256] = { 0 };
unsigned char telnet_willack[256] = { 0 }; unsigned char telnet_willack[256] = { 0 };
/*
* These are the values we have set or
* agreed to during our handshake.
* These are set in send_command(...)
*/
unsigned char telnet_do_set[256] = { 0 }; unsigned char telnet_do_set[256] = { 0 };
unsigned char telnet_will_set[256]= { 0 }; unsigned char telnet_will_set[256]= { 0 };
/*
* Set the default options for the telnet server.
*/
void set_options() { void set_options() {
/* We will not echo input */
telnet_options[ECHO] = WONT; telnet_options[ECHO] = WONT;
/* We will set graphics modes */
telnet_options[SGA] = WILL; telnet_options[SGA] = WILL;
/* We will not set new environments */
telnet_options[NEW_ENVIRON] = WONT; telnet_options[NEW_ENVIRON] = WONT;
/* The client should echo its own input */
telnet_willack[ECHO] = DO; telnet_willack[ECHO] = DO;
/* The client can set a graphics mode */
telnet_willack[SGA] = DO; telnet_willack[SGA] = DO;
/* The client should not change the window size */
telnet_willack[NAWS] = DONT; telnet_willack[NAWS] = DONT;
/* The client should tell us its terminal type (very important) */
telnet_willack[TTYPE] = DO; telnet_willack[TTYPE] = DO;
/* No linemode */
telnet_willack[LINEMODE] = DONT; telnet_willack[LINEMODE] = DONT;
/* And the client can set a new environment */
telnet_willack[NEW_ENVIRON] = DO; telnet_willack[NEW_ENVIRON] = DO;
} }
void send_command(int cmd, int opt) { void send_command(int cmd, int opt) {
/* Send a command to the telnet client */
if (cmd == DO || cmd == DONT) { if (cmd == DO || cmd == DONT) {
/* DO commands say what the client should do. */
if (((cmd == DO) && (telnet_do_set[opt] != DO)) || if (((cmd == DO) && (telnet_do_set[opt] != DO)) ||
((cmd == DONT) && (telnet_do_set[opt] != DONT))) { ((cmd == DONT) && (telnet_do_set[opt] != DONT))) {
/* And we only send them if there is a disagreement */
telnet_do_set[opt] = cmd; telnet_do_set[opt] = cmd;
printf("%c%c%c", IAC, cmd, opt); printf("%c%c%c", IAC, cmd, opt);
} }
} else if (cmd == WILL || cmd == WONT) { } else if (cmd == WILL || cmd == WONT) {
/* Similarly, WILL commands say what the server will do. */
if (((cmd == WILL) && (telnet_will_set[opt] != WILL)) || if (((cmd == WILL) && (telnet_will_set[opt] != WILL)) ||
((cmd == WONT) && (telnet_will_set[opt] != WONT))) { ((cmd == WONT) && (telnet_will_set[opt] != WONT))) {
/* And we only send them during disagreements */
telnet_will_set[opt] = cmd; telnet_will_set[opt] = cmd;
printf("%c%c%c", IAC, cmd, opt); printf("%c%c%c", IAC, cmd, opt);
} }
} else { } else {
/* Other commands are sent raw */
printf("%c%c", IAC, cmd); printf("%c%c", IAC, cmd);
} }
} }
@ -92,17 +143,23 @@ void send_command(int cmd, int opt) {
int main(int argc, char ** argv) { int main(int argc, char ** argv) {
/* I have a bad habit of being very C99, so this may not be everything */
/* The default terminal is ANSI */
char term[1024] = {'a','n','s','i'};
int k, ttype; int k, ttype;
uint32_t option = 0, done = 0, sb_mode = 0, do_echo = 0; uint32_t option = 0, done = 0, sb_mode = 0, do_echo = 0;
char term[1024] = {'a','n','s','i'}; /* Various pieces for the telnet communication */
char sb[1024] = {0}; char sb[1024] = {0};
char sb_len = 0; char sb_len = 0;
if (argc > 1) { if (argc > 1) {
if (!strcmp(argv[1], "-t")) { if (!strcmp(argv[1], "-t")) {
/* Yes, I know, lame way to get arguments, whatever, we only want one of them. */
/* Set the default options */
set_options(); set_options();
/* Let the client know what we're using */
for (option = 0; option < 256; option++) { for (option = 0; option < 256; option++) {
if (telnet_options[option]) { if (telnet_options[option]) {
send_command(telnet_options[option], option); send_command(telnet_options[option], option);
@ -116,13 +173,15 @@ int main(int argc, char ** argv) {
} }
} }
/* Negotiate options */
while (!feof(stdin) && !done) { while (!feof(stdin) && !done) {
unsigned char i = getchar(); unsigned char i = getchar();
unsigned char opt = 0; unsigned char opt = 0;
if (i == 255) { if (i == IAC) {
i = getchar(); i = getchar();
switch (i) { switch (i) {
case SE: case SE:
/* End of extended option mode */
sb_mode = 0; sb_mode = 0;
if (sb[0] == TTYPE) { if (sb[0] == TTYPE) {
strcpy(term, &sb[2]); strcpy(term, &sb[2]);
@ -130,11 +189,13 @@ int main(int argc, char ** argv) {
} }
break; break;
case NOP: case NOP:
/* No Op */
send_command(NOP, 0); send_command(NOP, 0);
fflush(stdout); fflush(stdout);
break; break;
case WILL: case WILL:
case WONT: case WONT:
/* Will / Won't Negotiation */
opt = getchar(); opt = getchar();
if (!telnet_willack[opt]) { if (!telnet_willack[opt]) {
telnet_willack[opt] = WONT; telnet_willack[opt] = WONT;
@ -142,70 +203,82 @@ int main(int argc, char ** argv) {
send_command(telnet_willack[opt], opt); send_command(telnet_willack[opt], opt);
fflush(stdout); fflush(stdout);
if ((i == WILL) && (opt == TTYPE)) { if ((i == WILL) && (opt == TTYPE)) {
/* WILL TTYPE? Great, let's do that now! */
printf("%c%c%c%c%c%c", IAC, SB, TTYPE, SEND, IAC, SE); printf("%c%c%c%c%c%c", IAC, SB, TTYPE, SEND, IAC, SE);
fflush(stdout); fflush(stdout);
} }
break; break;
case DO: case DO:
case DONT: case DONT:
/* Do / Don't Negotation */
opt = getchar(); opt = getchar();
if (!telnet_options[opt]) { if (!telnet_options[opt]) {
telnet_options[opt] = DONT; telnet_options[opt] = DONT;
} }
send_command(telnet_options[opt], opt); send_command(telnet_options[opt], opt);
if (opt == ECHO) { if (opt == ECHO) {
/* We don't really need this, as we don't accept input, but,
* in case we do in the future, set our echo mode */
do_echo = (i == DO); do_echo = (i == DO);
} }
fflush(stdout); fflush(stdout);
break; break;
case SB: case SB:
/* Begin Extended Option Mode */
sb_mode = 1; sb_mode = 1;
sb_len = 0; sb_len = 0;
memset(sb, 0, 1024); memset(sb, 0, 1024);
break; break;
case IAC: case IAC:
/* Connection Closed */ /* Connection Closed During Negotiation */
done = 1; done = 1;
break; break;
default: default:
break; break;
} }
} else if (sb_mode) { } else if (sb_mode) {
sb[sb_len] = i; /* Extended Option Mode -> Accept character */
sb_len++; if (sb_len < 1023) {
sb[sb_len] = i;
sb_len++;
}
} }
} }
} }
} else { } else {
/* Otherwise, we were run standalone, find the terminal type from the environement */
char * nterm = getenv("TERM"); char * nterm = getenv("TERM");
strcpy(term, nterm); strcpy(term, nterm);
} }
ready: ready:
/* Convert the entire terminal string to lower case */
for (k = 0; k < strlen(term); ++k) { for (k = 0; k < strlen(term); ++k) {
term[k] = tolower(term[k]); term[k] = tolower(term[k]);
} }
/* Do our terminal detection */
if (strstr(term, "xterm")) { if (strstr(term, "xterm")) {
ttype = 1; ttype = 1; /* 256-color, spaces */
} else if (strstr(term, "linux")) { } else if (strstr(term, "linux")) {
ttype = 3; ttype = 3; /* Spaces and blink attribute */
} else if (strstr(term, "vtnt")) { } else if (strstr(term, "vtnt")) {
ttype = 5; ttype = 5; /* Extended ASCII fallback == Windows */
} else if (strstr(term, "cygwin")) { } else if (strstr(term, "cygwin")) {
ttype = 5; ttype = 5; /* Extended ASCII fallback == Windows */
} else if (strstr(term, "vt220")) { } else if (strstr(term, "vt220")) {
ttype = 6; ttype = 6; /* No color support */
} else if (strstr(term, "fallback")) { } else if (strstr(term, "fallback")) {
ttype = 4; ttype = 4; /* Unicode fallback */
} else if (strstr(term, "rxvt")) { } else if (strstr(term, "rxvt")) {
ttype = 3; ttype = 3; /* Accepts LINUX mode */
} else { } else {
ttype = 2; ttype = 2; /* Verything else */
} }
int always_escape = 0; int always_escape = 0; /* Used for text mode */
/* Accept ^C -> restore cursor */
signal(SIGINT, SIGINT_handler); signal(SIGINT, SIGINT_handler);
switch (ttype) { switch (ttype) {
case 1: case 1:
@ -257,63 +330,65 @@ ready:
colors['%'] = "\033[5;45m"; /* Pink cheeks */ colors['%'] = "\033[5;45m"; /* Pink cheeks */
break; break;
case 4: case 4:
colors[','] = "\033[0;34;44m"; /* Blue background */ colors[','] = "\033[0;34;44m"; /* Blue background */
colors['.'] = "\033[1;37;47m"; /* White stars */ colors['.'] = "\033[1;37;47m"; /* White stars */
colors['\''] = "\033[0;30;40m"; /* Black border */ colors['\''] = "\033[0;30;40m"; /* Black border */
colors['@'] = "\033[1;37;47m"; /* Tan poptart */ colors['@'] = "\033[1;37;47m"; /* Tan poptart */
colors['$'] = "\033[1;35;45m"; /* Pink poptart */ colors['$'] = "\033[1;35;45m"; /* Pink poptart */
colors['-'] = "\033[1;31;41m"; /* Red poptart */ colors['-'] = "\033[1;31;41m"; /* Red poptart */
colors['>'] = "\033[1;31;41m"; /* Red rainbow */ colors['>'] = "\033[1;31;41m"; /* Red rainbow */
colors['&'] = "\033[0;33;43m"; /* Orange rainbow */ colors['&'] = "\033[0;33;43m"; /* Orange rainbow */
colors['+'] = "\033[1;33;43m"; /* Yellow Rainbow */ colors['+'] = "\033[1;33;43m"; /* Yellow Rainbow */
colors['#'] = "\033[1;32;42m"; /* Green rainbow */ colors['#'] = "\033[1;32;42m"; /* Green rainbow */
colors['='] = "\033[1;34;44m"; /* Light blue rainbow */ colors['='] = "\033[1;34;44m"; /* Light blue rainbow */
colors[';'] = "\033[0;34;44m"; /* Dark blue rainbow */ colors[';'] = "\033[0;34;44m"; /* Dark blue rainbow */
colors['*'] = "\033[1;30;40m"; /* Gray cat face */ colors['*'] = "\033[1;30;40m"; /* Gray cat face */
colors['%'] = "\033[1;35;45m"; /* Pink cheeks */ colors['%'] = "\033[1;35;45m"; /* Pink cheeks */
output = "██"; output = "██";
break; break;
case 5: case 5:
colors[','] = "\033[0;34;44m"; /* Blue background */ colors[','] = "\033[0;34;44m"; /* Blue background */
colors['.'] = "\033[1;37;47m"; /* White stars */ colors['.'] = "\033[1;37;47m"; /* White stars */
colors['\''] = "\033[0;30;40m"; /* Black border */ colors['\''] = "\033[0;30;40m"; /* Black border */
colors['@'] = "\033[1;37;47m"; /* Tan poptart */ colors['@'] = "\033[1;37;47m"; /* Tan poptart */
colors['$'] = "\033[1;35;45m"; /* Pink poptart */ colors['$'] = "\033[1;35;45m"; /* Pink poptart */
colors['-'] = "\033[1;31;41m"; /* Red poptart */ colors['-'] = "\033[1;31;41m"; /* Red poptart */
colors['>'] = "\033[1;31;41m"; /* Red rainbow */ colors['>'] = "\033[1;31;41m"; /* Red rainbow */
colors['&'] = "\033[0;33;43m"; /* Orange rainbow */ colors['&'] = "\033[0;33;43m"; /* Orange rainbow */
colors['+'] = "\033[1;33;43m"; /* Yellow Rainbow */ colors['+'] = "\033[1;33;43m"; /* Yellow Rainbow */
colors['#'] = "\033[1;32;42m"; /* Green rainbow */ colors['#'] = "\033[1;32;42m"; /* Green rainbow */
colors['='] = "\033[1;34;44m"; /* Light blue rainbow */ colors['='] = "\033[1;34;44m"; /* Light blue rainbow */
colors[';'] = "\033[0;34;44m"; /* Dark blue rainbow */ colors[';'] = "\033[0;34;44m"; /* Dark blue rainbow */
colors['*'] = "\033[1;30;40m"; /* Gray cat face */ colors['*'] = "\033[1;30;40m"; /* Gray cat face */
colors['%'] = "\033[1;35;45m"; /* Pink cheeks */ colors['%'] = "\033[1;35;45m"; /* Pink cheeks */
output = "\333\333"; output = "\333\333";
break; break;
case 6: case 6:
colors[','] = "::"; /* Blue background */ colors[','] = "::"; /* Blue background */
colors['.'] = "@@"; /* White stars */ colors['.'] = "@@"; /* White stars */
colors['\''] = " "; /* Black border */ colors['\''] = " "; /* Black border */
colors['@'] = "##"; /* Tan poptart */ colors['@'] = "##"; /* Tan poptart */
colors['$'] = "??"; /* Pink poptart */ colors['$'] = "??"; /* Pink poptart */
colors['-'] = "<>"; /* Red poptart */ colors['-'] = "<>"; /* Red poptart */
colors['>'] = "##"; /* Red rainbow */ colors['>'] = "##"; /* Red rainbow */
colors['&'] = "=="; /* Orange rainbow */ colors['&'] = "=="; /* Orange rainbow */
colors['+'] = "--"; /* Yellow Rainbow */ colors['+'] = "--"; /* Yellow Rainbow */
colors['#'] = "++"; /* Green rainbow */ colors['#'] = "++"; /* Green rainbow */
colors['='] = "~~"; /* Light blue rainbow */ colors['='] = "~~"; /* Light blue rainbow */
colors[';'] = "$$"; /* Dark blue rainbow */ colors[';'] = "$$"; /* Dark blue rainbow */
colors['*'] = ";;"; /* Gray cat face */ colors['*'] = ";;"; /* Gray cat face */
colors['%'] = "()"; /* Pink cheeks */ colors['%'] = "()"; /* Pink cheeks */
always_escape = 1; always_escape = 1;
break; break;
default: default:
break; break;
} }
/* Clear the screen */
printf("\033[H\033[2J\033[?25l"); printf("\033[H\033[2J\033[?25l");
/* Display the MOTD */
int countdown_clock = 5; int countdown_clock = 5;
for (k = 0; k < countdown_clock; ++k) { for (k = 0; k < countdown_clock; ++k) {
printf("\n\n\n"); printf("\n\n\n");
@ -333,9 +408,10 @@ ready:
fflush(stdout); fflush(stdout);
usleep(400000); usleep(400000);
printf("\033[H"); printf("\033[H"); /* Reset cursor */
} }
/* Clear the screen again */
printf("\033[H\033[2J\033[?25l"); printf("\033[H\033[2J\033[?25l");
int playing = 1; int playing = 1;
@ -343,27 +419,36 @@ ready:
char last = 0; char last = 0;
size_t y, x; size_t y, x;
while (playing) { while (playing) {
/* Render the frame */
for (y = MIN_ROW; y < MAX_ROW; ++y) { for (y = MIN_ROW; y < MAX_ROW; ++y) {
for (x = MIN_COL; x < MAX_COL; ++x) { for (x = MIN_COL; x < MAX_COL; ++x) {
if (always_escape) { if (always_escape) {
/* Text mode (or "Always Send Color Escapse") */
printf("%s", colors[frames[i][y][x]]); printf("%s", colors[frames[i][y][x]]);
} else { } else {
if (frames[i][y][x] != last && colors[frames[i][y][x]]) { if (frames[i][y][x] != last && colors[frames[i][y][x]]) {
/* Normal Mode, send escape (because the color changed) */
last = frames[i][y][x]; last = frames[i][y][x];
printf("%s%s", colors[frames[i][y][x]], output); printf("%s%s", colors[frames[i][y][x]], output);
} else { } else {
/* Same color, just send the output characters */
printf("%s", output); printf("%s", output);
} }
} }
} }
/* End of row, send newline */
if (y != MAX_ROW - 1) if (y != MAX_ROW - 1)
printf("\n"); printf("\n");
} }
/* Update frame crount */
++i; ++i;
if (!frames[i]) { if (!frames[i]) {
/* Loop animation */
i = 0; i = 0;
} }
/* Reset cursor */
printf("\033[H"); printf("\033[H");
/* Wait */
usleep(90000); usleep(90000);
} }
return 0; return 0;