1 /* interestingtimes.c - cursor control 2 * 3 * Copyright 2015 Rob Landley <rob (at) landley.net> 4 */ 5 6 #include "toys.h" 7 8 int xgettty(void) 9 { 10 int i, j; 11 12 for (i = 0; i<3; i++) if (isatty(j = (i+1)%3)) return j; 13 14 return xopen("/dev/tty", O_RDWR); 15 } 16 17 // Quick and dirty query size of terminal, doesn't do ANSI probe fallback. 18 // set x=80 y=25 before calling to provide defaults. Returns 0 if couldn't 19 // determine size. 20 21 int terminal_size(unsigned *xx, unsigned *yy) 22 { 23 struct winsize ws; 24 unsigned i, x = 0, y = 0; 25 char *s; 26 27 // stdin, stdout, stderr 28 for (i=0; i<3; i++) { 29 memset(&ws, 0, sizeof(ws)); 30 if (!ioctl(i, TIOCGWINSZ, &ws)) { 31 if (ws.ws_col) x = ws.ws_col; 32 if (ws.ws_row) y = ws.ws_row; 33 34 break; 35 } 36 } 37 s = getenv("COLUMNS"); 38 if (s) sscanf(s, "%u", &x); 39 s = getenv("LINES"); 40 if (s) sscanf(s, "%u", &y); 41 42 // Never return 0 for either value, leave it at default instead. 43 if (xx && x) *xx = x; 44 if (yy && y) *yy = y; 45 46 return x || y; 47 } 48 49 // Query terminal size, sending ANSI probe if necesary. (Probe queries xterm 50 // size through serial connection, when local TTY doesn't know but remote does.) 51 // Returns 0 if ANSI probe sent, 1 if size determined from tty or environment 52 53 int terminal_probesize(unsigned *xx, unsigned *yy) 54 { 55 if (terminal_size(xx, yy) && (!xx || *xx) && (!yy || *yy)) return 1; 56 57 // Send probe: bookmark cursor position, jump to bottom right, 58 // query position, return cursor to bookmarked position. 59 xprintf("\e[s\e[999C\e[999B\e[6n\e[u"); 60 61 return 0; 62 } 63 64 // Wrapper that parses results from ANSI probe to update screensize. 65 // Otherwise acts like scan_key() 66 int scan_key_getsize(char *scratch, int miliwait, unsigned *xx, unsigned *yy) 67 { 68 int key; 69 70 if (512&(key = scan_key(scratch, miliwait))) { 71 if (key>0) { 72 if (xx) *xx = (key>>10)&1023; 73 if (yy) *yy = (key>>20)&1023; 74 toys.signal = SIGWINCH; 75 76 return -3; 77 } 78 } 79 80 return key; 81 } 82 83 // Reset terminal to known state, saving copy of old state if old != NULL. 84 int set_terminal(int fd, int raw, struct termios *old) 85 { 86 struct termios termio; 87 88 // Fetch local copy of old terminfo, and copy struct contents to *old if set 89 if (!tcgetattr(fd, &termio) && old) *old = termio; 90 91 // the following are the bits set for an xterm. Linux text mode TTYs by 92 // default add two additional bits that only matter for serial processing 93 // (turn serial line break into an interrupt, and XON/XOFF flow control) 94 95 // Any key unblocks output, swap CR and NL on input 96 termio.c_iflag = IXANY|ICRNL|INLCR; 97 if (toys.which->flags & TOYFLAG_LOCALE) termio.c_iflag |= IUTF8; 98 99 // Output appends CR to NL, does magic undocumented postprocessing 100 termio.c_oflag = ONLCR|OPOST; 101 102 // Leave serial port speed alone 103 // termio.c_cflag = C_READ|CS8|EXTB; 104 105 // Generate signals, input entire line at once, echo output 106 // erase, line kill, escape control characters with ^ 107 // erase line char at a time 108 // "extended" behavior: ctrl-V quotes next char, ctrl-R reprints unread chars, 109 // ctrl-W erases word 110 termio.c_lflag = ISIG|ICANON|ECHO|ECHOE|ECHOK|ECHOCTL|ECHOKE|IEXTEN; 111 112 if (raw) cfmakeraw(&termio); 113 114 return tcsetattr(fd, TCSANOW, &termio); 115 } 116 117 void xset_terminal(int fd, int raw, struct termios *old) 118 { 119 if (-1 == set_terminal(fd, raw, old)) perror_exit("bad tty fd#%d", fd); 120 } 121 122 struct scan_key_list { 123 char *name, *seq; 124 } static const scan_key_list[] = TAGGED_ARRAY(KEY, 125 // up down right left pgup pgdn home end ins 126 {"UP", "\033[A"}, {"DOWN", "\033[B"}, {"RIGHT", "\033[C"}, {"LEFT", "\033[D"}, 127 {"PGUP", "\033[5~"}, {"PGDN", "\033[6~"}, {"HOME", "\033OH"}, 128 {"END", "\033OF"}, {"INSERT", "\033[2~"}, 129 130 {"F1", "\033OP"}, {"F2", "\033OQ"}, {"F3", "\033OR"}, {"F4", "\033OS"}, 131 {"F5", "\033[15~"}, {"F6", "\033[17~"}, {"F7", "\033[18~"}, 132 {"F8", "\033[19~"}, {"F9", "\033[20~"}, 133 134 {"SUP", "\033[1;2A"}, {"AUP", "\033[1;3A"}, {"CUP", "\033[1;5A"}, 135 {"SDOWN", "\033[1;2B"}, {"ADOWN", "\033[1;3B"}, {"CDOWN", "\033[1;5B"}, 136 {"SRIGHT", "\033[1;2C"}, {"ARIGHT", "\033[1;3C"}, {"CRIGHT", "\033[1;5C"}, 137 {"SLEFT", "\033[1;2D"}, {"ALEFT", "\033[1;3D"}, {"CLEFT", "\033[1;5D"}, 138 139 {"SF1", "\033O1;2P"}, {"AF1", "\033O1;3P"}, {"CF1", "\033[1;5P"} 140 ); 141 142 // Scan stdin for a keypress, parsing known escape sequences 143 // Blocks for miliwait miliseconds, none 0, forever if -1 144 // Returns: 0-255=literal, -1=EOF, -2=NONE, 256-...=index into scan_key_list 145 // >512 is x<<9+y<<21 146 // scratch space is necessary because last char of !seq could start new seq 147 // Zero out first byte of scratch before first call to scan_key 148 // block=0 allows fetching multiple characters before updating display 149 int scan_key(char *scratch, int miliwait) 150 { 151 struct pollfd pfd; 152 int maybe, i, j; 153 char *test; 154 155 for (;;) { 156 pfd.fd = 0; 157 pfd.events = POLLIN; 158 pfd.revents = 0; 159 160 maybe = 0; 161 if (*scratch) { 162 int pos[6]; 163 unsigned x, y; 164 165 // Check for return from terminal size probe 166 memset(pos, 0, 6*sizeof(int)); 167 scratch[(1+*scratch)&15] = 0; 168 sscanf(scratch+1, "\033%n[%n%3u%n;%n%3u%nR%n", pos, pos+1, &y, 169 pos+2, pos+3, &x, pos+4, pos+5); 170 if (pos[5]) { 171 // Recognized X/Y position, consume and return 172 *scratch = 0; 173 return 512+(x<<10)+(y<<20); 174 } else for (i=0; i<6; i++) if (pos[i]==*scratch) maybe = 1; 175 176 // Check sequences 177 for (i = 0; i<ARRAY_LEN(scan_key_list); i++) { 178 test = scan_key_list[i].seq; 179 for (j = 0; j<*scratch; j++) if (scratch[j+1] != test[j]) break; 180 if (j == *scratch) { 181 maybe = 1; 182 if (!test[j]) { 183 // We recognized current sequence: consume and return 184 *scratch = 0; 185 return 256+i; 186 } 187 } 188 } 189 190 // If current data can't be a known sequence, return next raw char 191 if (!maybe) break; 192 } 193 194 // Need more data to decide 195 196 // 30 miliseconds is about the gap between characters at 300 baud 197 if (maybe || miliwait != -1) 198 if (!xpoll(&pfd, 1, maybe ? 30 : miliwait)) break; 199 200 // Read 1 byte so we don't overshoot sequence match. (We can deviate 201 // and fail to match, but match consumes entire buffer.) 202 if (toys.signal || 1 != read(0, scratch+1+*scratch, 1)) 203 return toys.signal ? -3 : -1; 204 ++*scratch; 205 } 206 207 // Was not a sequence 208 if (!*scratch) return -2; 209 i = scratch[1]; 210 if (--*scratch) memmove(scratch+1, scratch+2, *scratch); 211 212 return i; 213 } 214 215 void tty_esc(char *s) 216 { 217 printf("\033[%s", s); 218 } 219 220 void tty_jump(int x, int y) 221 { 222 char s[32]; 223 224 sprintf(s, "%d;%dH", y+1, x+1); 225 tty_esc(s); 226 } 227 228 void tty_reset(void) 229 { 230 set_terminal(1, 0, 0); 231 tty_esc("?25h"); 232 tty_esc("0m"); 233 tty_jump(0, 999); 234 tty_esc("K"); 235 fflush(0); 236 } 237 238 // If you call set_terminal(), use sigatexit(tty_sigreset); 239 void tty_sigreset(int i) 240 { 241 tty_reset(); 242 _exit(128+i); 243 } 244
