Annotation of src/usr.bin/mg/ttyio.c, Revision 1.9
1.1 deraadt 1: /*
1.5 millert 2: * POSIX terminal I/O.
1.1 deraadt 3: *
4: * The functions in this file
5: * negotiate with the operating system for
6: * keyboard characters, and write characters to
7: * the display in a barely buffered fashion.
8: */
9: #include "def.h"
10:
11: #include <sys/types.h>
1.5 millert 12: #include <sys/time.h>
13: #include <sys/ioctl.h>
1.1 deraadt 14: #include <fcntl.h>
1.2 deraadt 15: #include <termios.h>
1.4 millert 16: #include <term.h>
1.1 deraadt 17:
1.8 millert 18: #define NOBUF 512 /* Output buffer size. */
1.1 deraadt 19:
1.7 millert 20: #ifndef TCSASOFT
21: #define TCSASOFT 0
22: #endif
23:
1.1 deraadt 24: char obuf[NOBUF]; /* Output buffer. */
1.8 millert 25: int nobuf; /* Buffer count. */
26: struct termios oldtty; /* POSIX tty settings. */
27: struct termios newtty;
1.1 deraadt 28: int nrow; /* Terminal size, rows. */
29: int ncol; /* Terminal size, columns. */
30:
1.8 millert 31: /* XXX - move most of these to def.h? */
32: void ttopen __P((void));
33: int ttraw __P((void));
34: void ttclose __P((void));
35: int ttcooked __P((void));
36: void ttputc __P((int));
37: void ttflush __P((void));
38: int ttgetc __P((void));
39: void setttysize __P((void));
40: int typeahead __P((void));
41: void panic __P((char *));
42: int ttwait __P((void));
43:
44: /*
45: * This function gets called once, to set up the terminal
46: * On systems w/o TCSASOFT we turn off off flow control,
47: * which isn't really the right thing to do.
1.1 deraadt 48: */
1.8 millert 49: void
1.1 deraadt 50: ttopen()
51: {
52:
1.8 millert 53: if (ttraw() == FALSE)
54: panic("aborting due to terminal initialize failure");
55: }
1.1 deraadt 56:
1.8 millert 57: /*
58: * This function sets the terminal to RAW mode, as defined for the current
59: * shell. This is called both by ttopen() above and by spawncli() to
60: * get the current terminal settings and then change them to what
61: * mg expects. Thus, tty changes done while spawncli() is in effect
62: * will be reflected in mg.
63: */
64: int
65: ttraw()
66: {
67:
68: if (tcgetattr(0, &oldtty) < 0) {
69: ewprintf("ttopen can't get terminal attributes");
70: return(FALSE);
71: }
72: (void)memcpy(&newtty, &oldtty, sizeof(newtty));
73: /* Set terminal to 'raw' mode and ignore a 'break' */
74: newtty.c_cc[VMIN] = 1;
75: newtty.c_cc[VTIME] = 0;
76: newtty.c_iflag |= IGNBRK;
77: newtty.c_iflag &= ~(BRKINT | PARMRK | INLCR | IGNCR | ICRNL | IXON);
78: newtty.c_oflag &= ~OPOST;
79: newtty.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
1.7 millert 80:
81: #if !TCSASOFT
1.8 millert 82: /*
83: * If we don't have TCSASOFT, force terminal to
84: * 8 bits, no parity.
85: */
86: newtty.c_iflag &= ~ISTRIP;
87: newtty.c_cflag &= ~(CSIZE | PARENB);
88: newtty.c_cflag |= CS8;
1.7 millert 89: #endif
1.8 millert 90: if (tcsetattr(0, TCSASOFT | TCSADRAIN, &newtty) < 0) {
91: ewprintf("ttopen can't tcsetattr");
92: return(FALSE);
93: }
94: }
1.1 deraadt 95:
1.8 millert 96: /*
97: * This function gets called just before we go back home to the shell.
98: * Put all of the terminal parameters back.
99: * Under UN*X this just calls ttcooked(), but the ttclose() hook is in
100: * because vttidy() in display.c expects it for portability reasons.
101: */
102: void
103: ttclose()
104: {
1.1 deraadt 105:
1.8 millert 106: if (ttcooked() == FALSE)
107: panic(""); /* ttcooked() already printf'd */
1.1 deraadt 108: }
109:
110: /*
1.8 millert 111: * This function restores all terminal settings to their default values,
112: * in anticipation of exiting or suspending the editor.
1.1 deraadt 113: */
1.8 millert 114: int
115: ttcooked()
1.1 deraadt 116: {
1.8 millert 117:
1.1 deraadt 118: ttflush();
1.8 millert 119: if (tcsetattr(0, TCSASOFT | TCSADRAIN, &oldtty) < 0) {
120: ewprintf("ttclose can't tcsetattr");
121: return(FALSE);
122: }
123: return(TRUE);
1.1 deraadt 124: }
125:
126: /*
1.8 millert 127: * Write character to the display. Characters are buffered up,
128: * to make things a little bit more efficient.
1.1 deraadt 129: */
1.8 millert 130: void
1.1 deraadt 131: ttputc(c)
1.8 millert 132: int c;
1.1 deraadt 133: {
1.5 millert 134:
1.1 deraadt 135: if (nobuf >= NOBUF)
136: ttflush();
137: obuf[nobuf++] = c;
138: }
139:
140: /*
141: * Flush output.
142: */
1.8 millert 143: void
1.1 deraadt 144: ttflush()
145: {
1.5 millert 146:
1.1 deraadt 147: if (nobuf != 0) {
1.8 millert 148: if (write(1, obuf, nobuf) != nobuf)
149: panic("ttflush write failed");
1.1 deraadt 150: nobuf = 0;
151: }
152: }
153:
154: /*
155: * Read character from terminal.
156: * All 8 bits are returned, so that you can use
157: * a multi-national terminal.
158: */
1.8 millert 159: int
1.1 deraadt 160: ttgetc()
161: {
1.9 ! millert 162: char c;
1.5 millert 163:
1.9 ! millert 164: while (read(0, &c, 1) != 1)
1.5 millert 165: ;
1.9 ! millert 166: return ((int) c);
1.1 deraadt 167: }
168:
169: /*
1.8 millert 170: * Set the tty size.
171: * XXX - belongs in tty.c since it uses terminfo vars.
1.1 deraadt 172: */
1.8 millert 173: void
1.1 deraadt 174: setttysize()
175: {
176: #ifdef TIOCGWINSZ
1.8 millert 177: struct winsize winsize;
1.5 millert 178:
1.1 deraadt 179: if (ioctl(0, TIOCGWINSZ, (char *) &winsize) == 0) {
1.5 millert 180: nrow = winsize.ws_row;
181: ncol = winsize.ws_col;
1.8 millert 182: } else nrow = 0;
1.1 deraadt 183: #endif
1.8 millert 184: if ((nrow <= 0 || ncol <= 0) &&
185: ((nrow = lines) <= 0 || (ncol = columns) <= 0)) {
1.1 deraadt 186: nrow = 24;
187: ncol = 80;
188: }
1.4 millert 189:
190: /* Enforce maximum screen size. */
191: if (nrow > NROW)
192: nrow = NROW;
193: if (ncol > NCOL)
1.1 deraadt 194: ncol = NCOL;
195: }
196:
1.8 millert 197: /*
198: * Returns TRUE if there are characters waiting to be read.
199: */
200: int
201: typeahead()
202: {
203: int x;
204:
205: return((ioctl(0, FIONREAD, (char *) &x) < 0) ? 0 : x);
206: }
207:
208: /*
209: * panic - just exit, as quickly as we can.
210: */
211: void
212: panic(s)
213: char *s;
214: {
215:
216: (void) fputs("panic: ", stderr);
217: (void) fputs(s, stderr);
218: (void) fputc('\n', stderr);
219: abort(); /* To leave a core image. */
220: }
221:
1.1 deraadt 222: #ifndef NO_DPROMPT
223: /*
1.8 millert 224: * A program to return TRUE if we wait for 2 seconds without anything
225: * happening, else return FALSE. Cribbed from mod.sources xmodem.
1.1 deraadt 226: */
1.8 millert 227: int
1.1 deraadt 228: ttwait()
229: {
1.8 millert 230: fd_set readfds;
231: struct timeval tmout;
1.5 millert 232:
1.8 millert 233: FD_ZERO(&readfds);
1.5 millert 234: FD_SET(0, &readfds);
235:
236: tmout.tv_sec = 2;
237: tmout.tv_usec = 0;
238:
239: if ((select(1, &readfds, NULL, NULL, &tmout)) == 0)
1.8 millert 240: return (TRUE);
241: return (FALSE);
1.1 deraadt 242: }
1.8 millert 243: #endif /* NO_DPROMPT */
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