From 72cd2e07f1cea190925021472465325e72589f47 Mon Sep 17 00:00:00 2001 From: Rob Landley Date: Fri, 8 May 2015 20:20:29 -0500 Subject: Move not-curses code into interstingtimes.c --- lib/interestingtimes.c | 124 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 124 insertions(+) create mode 100644 lib/interestingtimes.c (limited to 'lib/interestingtimes.c') diff --git a/lib/interestingtimes.c b/lib/interestingtimes.c new file mode 100644 index 00000000..cea5039f --- /dev/null +++ b/lib/interestingtimes.c @@ -0,0 +1,124 @@ +/* interestingtimes.c - cursor control + * + * Copyright 2015 Rob Landley + */ + +#include "toys.h" + +// Quick and dirty query size of terminal, doesn't do ANSI probe fallback. +// set x=80 y=25 before calling to provide defaults. Returns 0 if couldn't +// determine size. + +int terminal_size(unsigned *xx, unsigned *yy) +{ + struct winsize ws; + unsigned i, x = 0, y = 0; + char *s; + + // stdin, stdout, stderr + for (i=0; i<3; i++) { + memset(&ws, 0, sizeof(ws)); + if (!ioctl(i, TIOCGWINSZ, &ws)) { + if (ws.ws_col) x = ws.ws_col; + if (ws.ws_row) y = ws.ws_row; + + break; + } + } + s = getenv("COLUMNS"); + if (s) sscanf(s, "%u", &x); + s = getenv("LINES"); + if (s) sscanf(s, "%u", &y); + + // Never return 0 for either value, leave it at default instead. + if (xx && x) *xx = x; + if (yy && y) *yy = y; + + return x || y; +} + +// Reset terminal to known state, saving copy of old state if old != NULL. +int set_terminal(int fd, int raw, struct termios *old) +{ + struct termios termio; + + // Fetch local copy of old terminfo, and copy struct contents to *old if set + if (!tcgetattr(fd, &termio) && old) *old = termio; + + // the following are the bits set for an xterm. Linux text mode TTYs by + // default add two additional bits that only matter for serial processing + // (turn serial line break into an interrupt, and XON/XOFF flow control) + + // Any key unblocks output, swap CR and NL on input + termio.c_iflag = IXANY|ICRNL|INLCR; + if (toys.which->flags & TOYFLAG_LOCALE) termio.c_iflag |= IUTF8; + + // Output appends CR to NL, does magic undocumented postprocessing + termio.c_oflag = ONLCR|OPOST; + + // Leave serial port speed alone + // termio.c_cflag = C_READ|CS8|EXTB; + + // Generate signals, input entire line at once, echo output + // erase, line kill, escape control characters with ^ + // erase line char at a time + // "extended" behavior: ctrl-V quotes next char, ctrl-R reprints unread chars, + // ctrl-W erases word + termio.c_lflag = ISIG|ICANON|ECHO|ECHOE|ECHOK|ECHOCTL|ECHOKE|IEXTEN; + + if (raw) cfmakeraw(&termio); + + return tcsetattr(fd, TCSANOW, &termio); +} + +// Scan stdin for a keypress, parsing known escape sequences +// seqs is array of char * strings, ends with NULL ptr +// Returns: 0-255=literal, -1=EOF, -2=NONE, 256-...=index into seq +// scratch space is necessary because last char of !seq could start new seq +// Zero out first byte of scratch before first call to scan_key +// block=0 allows fetching multiple characters before updating display +int scan_key(char *scratch, char **seqs, int block) +{ + struct pollfd pfd; + int maybe, i, j; + char *test; + + for (;;) { + pfd.fd = 0; + pfd.events = POLLIN; + pfd.revents = 0; + + // check sequences + maybe = 0; + if (*scratch) { + for (i = maybe = 0; (test = seqs[i]); i++) { + for (j = 0; j<*scratch; j++) if (scratch[j+1] != test[j]) break; + if (j == *scratch) { + maybe = 1; + if (!test[j]) { + // We recognized current sequence: consume and return + *scratch = 0; + return 256+i; + } + } + } + // If current data can't be a known sequence, return next raw char + if (!maybe) break; + } + + // Need more data to decide + + // 30 miliseconds is about the gap between characters at 300 baud + if (maybe || !block) if (!xpoll(&pfd, 1, 30*maybe)) break; + + if (1 != read(0, scratch+1+*scratch, 1)) return -1; + ++*scratch; + } + + // Was not a sequence + if (!*scratch) return -2; + i = scratch[1]; + if (--*scratch) memmove(scratch+1, scratch+2, *scratch); + + return i; +} -- cgit v1.2.3