Annotation of src/usr.bin/mg/ttyio.c, Revision 1.20
1.20 ! millert 1: /* $OpenBSD: ttyio.c,v 1.19 2002/03/27 17:42:37 millert Exp $ */
1.13 niklas 2:
1.1 deraadt 3: /*
1.5 millert 4: * POSIX terminal I/O.
1.1 deraadt 5: *
6: * The functions in this file
7: * negotiate with the operating system for
8: * keyboard characters, and write characters to
9: * the display in a barely buffered fashion.
10: */
11: #include "def.h"
12:
13: #include <sys/types.h>
1.5 millert 14: #include <sys/time.h>
15: #include <sys/ioctl.h>
1.1 deraadt 16: #include <fcntl.h>
1.2 deraadt 17: #include <termios.h>
1.4 millert 18: #include <term.h>
1.1 deraadt 19:
1.8 millert 20: #define NOBUF 512 /* Output buffer size. */
1.1 deraadt 21:
1.7 millert 22: #ifndef TCSASOFT
23: #define TCSASOFT 0
24: #endif
25:
1.1 deraadt 26: char obuf[NOBUF]; /* Output buffer. */
1.8 millert 27: int nobuf; /* Buffer count. */
28: struct termios oldtty; /* POSIX tty settings. */
29: struct termios newtty;
1.1 deraadt 30: int nrow; /* Terminal size, rows. */
31: int ncol; /* Terminal size, columns. */
32:
1.8 millert 33: /*
1.10 millert 34: * This function gets called once, to set up the terminal.
1.8 millert 35: * On systems w/o TCSASOFT we turn off off flow control,
36: * which isn't really the right thing to do.
1.1 deraadt 37: */
1.8 millert 38: void
1.1 deraadt 39: ttopen()
40: {
41:
1.12 millert 42: if (!isatty(STDIN_FILENO) || !isatty(STDOUT_FILENO))
1.16 mickey 43: panic("standard input and output must be a terminal");
1.12 millert 44:
1.8 millert 45: if (ttraw() == FALSE)
46: panic("aborting due to terminal initialize failure");
47: }
1.1 deraadt 48:
1.8 millert 49: /*
50: * This function sets the terminal to RAW mode, as defined for the current
51: * shell. This is called both by ttopen() above and by spawncli() to
52: * get the current terminal settings and then change them to what
53: * mg expects. Thus, tty changes done while spawncli() is in effect
54: * will be reflected in mg.
55: */
56: int
57: ttraw()
58: {
59:
60: if (tcgetattr(0, &oldtty) < 0) {
61: ewprintf("ttopen can't get terminal attributes");
62: return(FALSE);
63: }
64: (void)memcpy(&newtty, &oldtty, sizeof(newtty));
65: /* Set terminal to 'raw' mode and ignore a 'break' */
66: newtty.c_cc[VMIN] = 1;
67: newtty.c_cc[VTIME] = 0;
68: newtty.c_iflag |= IGNBRK;
69: newtty.c_iflag &= ~(BRKINT | PARMRK | INLCR | IGNCR | ICRNL | IXON);
70: newtty.c_oflag &= ~OPOST;
71: newtty.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
1.7 millert 72:
73: #if !TCSASOFT
1.8 millert 74: /*
75: * If we don't have TCSASOFT, force terminal to
76: * 8 bits, no parity.
77: */
78: newtty.c_iflag &= ~ISTRIP;
79: newtty.c_cflag &= ~(CSIZE | PARENB);
80: newtty.c_cflag |= CS8;
1.7 millert 81: #endif
1.8 millert 82: if (tcsetattr(0, TCSASOFT | TCSADRAIN, &newtty) < 0) {
83: ewprintf("ttopen can't tcsetattr");
84: return(FALSE);
85: }
1.10 millert 86: return(TRUE);
1.8 millert 87: }
1.1 deraadt 88:
1.8 millert 89: /*
90: * This function gets called just before we go back home to the shell.
91: * Put all of the terminal parameters back.
92: * Under UN*X this just calls ttcooked(), but the ttclose() hook is in
93: * because vttidy() in display.c expects it for portability reasons.
94: */
95: void
96: ttclose()
97: {
1.1 deraadt 98:
1.8 millert 99: if (ttcooked() == FALSE)
100: panic(""); /* ttcooked() already printf'd */
1.1 deraadt 101: }
102:
103: /*
1.8 millert 104: * This function restores all terminal settings to their default values,
105: * in anticipation of exiting or suspending the editor.
1.1 deraadt 106: */
1.8 millert 107: int
108: ttcooked()
1.1 deraadt 109: {
1.8 millert 110:
1.1 deraadt 111: ttflush();
1.8 millert 112: if (tcsetattr(0, TCSASOFT | TCSADRAIN, &oldtty) < 0) {
113: ewprintf("ttclose can't tcsetattr");
114: return(FALSE);
115: }
116: return(TRUE);
1.1 deraadt 117: }
118:
119: /*
1.8 millert 120: * Write character to the display. Characters are buffered up,
121: * to make things a little bit more efficient.
1.1 deraadt 122: */
1.11 millert 123: int
1.19 millert 124: ttputc(int c)
1.1 deraadt 125: {
1.5 millert 126:
1.1 deraadt 127: if (nobuf >= NOBUF)
128: ttflush();
129: obuf[nobuf++] = c;
1.11 millert 130: return(c);
1.1 deraadt 131: }
132:
133: /*
134: * Flush output.
135: */
1.8 millert 136: void
1.1 deraadt 137: ttflush()
138: {
1.19 millert 139: ssize_t written;
1.20 ! millert 140: char *buf = obuf;
1.19 millert 141:
142: if (nobuf == 0)
143: return;
1.5 millert 144:
1.20 ! millert 145: while ((written = write(fileno(stdout), buf, nobuf)) != nobuf) {
1.19 millert 146: if (written == -1)
1.8 millert 147: panic("ttflush write failed");
1.20 ! millert 148: buf += written;
! 149: nobuf -= written;
1.1 deraadt 150: }
151: }
152:
153: /*
154: * Read character from terminal.
155: * All 8 bits are returned, so that you can use
156: * a multi-national terminal.
157: */
1.8 millert 158: int
1.1 deraadt 159: ttgetc()
160: {
1.9 millert 161: char c;
1.18 deraadt 162: int ret;
1.5 millert 163:
1.18 deraadt 164: do {
165: ret = read(0, &c, 1);
166: if (ret == -1 && errno == EINTR) {
167: if (winch_flag) {
168: refresh(0, 0);
169: winch_flag = 0;
170: }
171: } else if (ret == 1)
172: break;
173: } while (1);
1.9 millert 174: return ((int) c);
1.1 deraadt 175: }
176:
1.8 millert 177: /*
178: * Returns TRUE if there are characters waiting to be read.
179: */
180: int
181: typeahead()
182: {
183: int x;
184:
185: return((ioctl(0, FIONREAD, (char *) &x) < 0) ? 0 : x);
186: }
187:
188: /*
189: * panic - just exit, as quickly as we can.
190: */
1.15 art 191: void
1.19 millert 192: panic(char *s)
1.8 millert 193: {
194:
195: (void) fputs("panic: ", stderr);
196: (void) fputs(s, stderr);
197: (void) fputc('\n', stderr);
1.12 millert 198: exit(1);
1.8 millert 199: }
200:
1.1 deraadt 201: /*
1.14 art 202: * This function returns FALSE if any characters have showed up on the
203: * tty before 'msec' miliseconds.
1.1 deraadt 204: */
1.8 millert 205: int
1.14 art 206: ttwait(int msec)
1.1 deraadt 207: {
1.8 millert 208: fd_set readfds;
209: struct timeval tmout;
1.5 millert 210:
1.16 mickey 211: FD_ZERO(&readfds);
1.5 millert 212: FD_SET(0, &readfds);
213:
1.14 art 214: tmout.tv_sec = msec/1000;
215: tmout.tv_usec = msec - tmout.tv_sec * 1000;
1.5 millert 216:
217: if ((select(1, &readfds, NULL, NULL, &tmout)) == 0)
1.8 millert 218: return (TRUE);
219: return (FALSE);
1.1 deraadt 220: }
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