Annotation of src/usr.bin/mg/ttyio.c, Revision 1.26
1.26 ! db 1: /* $OpenBSD: ttyio.c,v 1.25 2003/12/04 01:37:28 vincent Exp $ */
1.13 niklas 2:
1.1 deraadt 3: /*
1.5 millert 4: * POSIX terminal I/O.
1.1 deraadt 5: *
1.23 vincent 6: * The functions in this file negotiate with the operating system for
7: * keyboard characters, and write characters to the display in a barely
8: * buffered fashion.
1.1 deraadt 9: */
1.26 ! db 10: #include "def.h"
1.1 deraadt 11:
1.26 ! db 12: #include <sys/types.h>
! 13: #include <sys/time.h>
! 14: #include <sys/ioctl.h>
! 15: #include <fcntl.h>
! 16: #include <termios.h>
! 17: #include <term.h>
1.1 deraadt 18:
1.23 vincent 19: #define NOBUF 512 /* Output buffer size. */
1.1 deraadt 20:
1.7 millert 21: #ifndef TCSASOFT
22: #define TCSASOFT 0
23: #endif
24:
1.24 vincent 25: int ttstarted;
1.23 vincent 26: char obuf[NOBUF]; /* Output buffer. */
27: int nobuf; /* Buffer count. */
28: struct termios oldtty; /* POSIX tty settings. */
1.8 millert 29: struct termios newtty;
1.23 vincent 30: int nrow; /* Terminal size, rows. */
31: int ncol; /* Terminal size, columns. */
1.1 deraadt 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
1.23 vincent 39: ttopen(void)
1.1 deraadt 40: {
1.12 millert 41: if (!isatty(STDIN_FILENO) || !isatty(STDOUT_FILENO))
1.16 mickey 42: panic("standard input and output must be a terminal");
1.12 millert 43:
1.8 millert 44: if (ttraw() == FALSE)
45: panic("aborting due to terminal initialize failure");
46: }
1.1 deraadt 47:
1.8 millert 48: /*
49: * This function sets the terminal to RAW mode, as defined for the current
50: * shell. This is called both by ttopen() above and by spawncli() to
51: * get the current terminal settings and then change them to what
52: * mg expects. Thus, tty changes done while spawncli() is in effect
53: * will be reflected in mg.
54: */
55: int
1.23 vincent 56: ttraw(void)
1.8 millert 57: {
58: if (tcgetattr(0, &oldtty) < 0) {
59: ewprintf("ttopen can't get terminal attributes");
1.23 vincent 60: return (FALSE);
1.8 millert 61: }
62: (void)memcpy(&newtty, &oldtty, sizeof(newtty));
63: /* Set terminal to 'raw' mode and ignore a 'break' */
64: newtty.c_cc[VMIN] = 1;
65: newtty.c_cc[VTIME] = 0;
66: newtty.c_iflag |= IGNBRK;
67: newtty.c_iflag &= ~(BRKINT | PARMRK | INLCR | IGNCR | ICRNL | IXON);
68: newtty.c_oflag &= ~OPOST;
69: newtty.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
1.7 millert 70:
71: #if !TCSASOFT
1.8 millert 72: /*
73: * If we don't have TCSASOFT, force terminal to
74: * 8 bits, no parity.
75: */
76: newtty.c_iflag &= ~ISTRIP;
77: newtty.c_cflag &= ~(CSIZE | PARENB);
78: newtty.c_cflag |= CS8;
1.7 millert 79: #endif
1.8 millert 80: if (tcsetattr(0, TCSASOFT | TCSADRAIN, &newtty) < 0) {
81: ewprintf("ttopen can't tcsetattr");
1.23 vincent 82: return (FALSE);
1.8 millert 83: }
1.24 vincent 84: ttstarted = 1;
85:
1.23 vincent 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
1.23 vincent 96: ttclose(void)
1.8 millert 97: {
1.24 vincent 98: if (ttstarted) {
99: if (ttcooked() == FALSE)
100: panic(""); /* ttcooked() already printf'd */
101: ttstarted = 0;
102: }
1.1 deraadt 103: }
104:
105: /*
1.8 millert 106: * This function restores all terminal settings to their default values,
107: * in anticipation of exiting or suspending the editor.
1.1 deraadt 108: */
1.8 millert 109: int
1.23 vincent 110: ttcooked(void)
1.1 deraadt 111: {
112: ttflush();
1.8 millert 113: if (tcsetattr(0, TCSASOFT | TCSADRAIN, &oldtty) < 0) {
114: ewprintf("ttclose can't tcsetattr");
1.23 vincent 115: return (FALSE);
1.8 millert 116: }
1.23 vincent 117: return (TRUE);
1.1 deraadt 118: }
119:
120: /*
1.8 millert 121: * Write character to the display. Characters are buffered up,
122: * to make things a little bit more efficient.
1.1 deraadt 123: */
1.11 millert 124: int
1.19 millert 125: ttputc(int c)
1.1 deraadt 126: {
127: if (nobuf >= NOBUF)
128: ttflush();
129: obuf[nobuf++] = c;
1.23 vincent 130: return (c);
1.1 deraadt 131: }
132:
133: /*
134: * Flush output.
135: */
1.8 millert 136: void
1.23 vincent 137: ttflush(void)
1.1 deraadt 138: {
1.26 ! db 139: ssize_t written;
! 140: char *buf = obuf;
1.22 deraadt 141:
1.19 millert 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: }
1.21 millert 151: nobuf = 0;
1.1 deraadt 152: }
153:
154: /*
1.23 vincent 155: * Read character from terminal. All 8 bits are returned, so that you
156: * can use a multi-national terminal.
1.1 deraadt 157: */
1.8 millert 158: int
1.23 vincent 159: ttgetc(void)
1.1 deraadt 160: {
1.9 millert 161: char c;
1.26 ! db 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);
1.25 vincent 174: return ((int) c) & 0xFF;
1.1 deraadt 175: }
176:
1.8 millert 177: /*
178: * Returns TRUE if there are characters waiting to be read.
179: */
180: int
1.23 vincent 181: typeahead(void)
1.8 millert 182: {
183: int x;
184:
1.23 vincent 185: return ((ioctl(0, FIONREAD, (char *) &x) < 0) ? 0 : x);
1.8 millert 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: {
1.24 vincent 194: ttclose();
1.8 millert 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
1.26 ! db 203: * tty before 'msec' milliseconds.
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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