1: #ifndef lint
   2: static char *rcsid_Xttylib_c = "$Header: Xttylib.c,v 10.6 86/02/01 15:42:48 tony Rel $";
   3: #endif
   4: /* This version has a single reverse-video argument instead of colors.  It
   5:    really only works well on monochrome displays */
   6: 
   7: /* Library of routines to create a terminal emulator window
   8:  *
   9:  * Routines in this library are:
  10:  *
  11:  *	CreateTTYWindow		Creates a new instance of a terminal window
  12:  *	DestroyTTYWindow	Destroys a terminal window
  13:  *	TTYPutString		Puts a string in a terminal window
  14:  *	TTYPutChar		Puts a character in a terminal window
  15:  *	TTYPrintf		Does a printf in a terminal window
  16:  *	TTYGetString		Gets s string from a terminal window
  17:  *	TTYGetChar		Gets a char from a terminal window
  18:  *	SetStdout		Flushes stdout and assigns it to a window
  19:  *	ResetStdout		Resets stdout to its inital value
  20:  *
  21:  * The terminal window created responds to exactly the same character
  22:  * sequences as xterm (not surprising).  Creating a window automatically
  23:  * maps it
  24:  *
  25:  * These routines pass around a pointer to a TTYWindow:
  26:  *
  27:  * typedef struct _TTYWindow {
  28:  * 	Window w;		The window id
  29:  *	int pid;		The pid of the subprocess xterm
  30:  *	short file;		The file id of the tty to read/write characters to/from
  31:  * } TTYWindow;
  32:  *
  33:  *
  34:  * The SetStdout routine is highly useful in conjunction with curses
  35:  * since curses always writes to stdout.
  36:  */
  37: 
  38: #include <X/Xlib.h>
  39: #include <stdio.h>
  40: #include <signal.h>
  41: #include <sys/file.h>
  42: #include <sys/ioctl.h>
  43: #include <sgtty.h>
  44: #include "Xtty.h"
  45: 
  46: TTYWindow *CreateTTYWindow(cols, lines, x, y, normFont, boldFont, bwidth,
  47:         reverse)
  48:     int lines, cols, x, y, bwidth, reverse;
  49:     char *normFont, *boldFont;
  50: {
  51:     TTYWindow *t;
  52: 
  53:     if ((t = (TTYWindow *) malloc(sizeof(TTYWindow))) ==
  54:         NULL) return NULL;
  55: 
  56:     if (Start_slave_xterm(t, lines, cols, x, y, normFont, boldFont,
  57:         bwidth, reverse) == 0) {
  58:         free(t);
  59:         fprintf(stderr, "Couldn't start slave xterm\n");
  60:         return NULL;
  61:     }
  62: 
  63:     return t;
  64: }
  65: 
  66: int ttyMasterPty;
  67: int keepMasterOpen = 0;
  68: 
  69: int Start_slave_xterm(t, lines, cols, x, y, normFont, boldFont, bwidth,
  70:         reverse)
  71:     TTYWindow *t;
  72:     int lines, cols, x, y, bwidth, reverse;
  73:     char *normFont, *boldFont;
  74: {
  75: #define BUFSIZE 20
  76: 
  77:     char ttyName[BUFSIZE];
  78:     char Sbuf[BUFSIZE], sizeBuf[BUFSIZE], wdBuf[BUFSIZE],
  79:         inputBuffer[BUFSIZE];
  80:     int bytesRead, len;
  81: 
  82:     if (boldFont == NULL) boldFont = normFont;
  83: 
  84:     ttyMasterPty = GetPty(ttyName);
  85:     if (ttyMasterPty == -1) return 0;
  86: 
  87:     if ((t->pid = vfork()) < 0) return 0;
  88: 
  89:     if (t->pid == 0) {
  90:         sprintf(Sbuf, "-S%c%c%d", ttyName[8], ttyName[9], ttyMasterPty);
  91:         sprintf(sizeBuf, "=%dx%d+%d+%d", cols, lines, x, y);
  92:         sprintf(wdBuf, "%d", bwidth);
  93: 
  94:         execlp("xterm", "xterm", Sbuf, "-fn", normFont, "-fb", boldFont,
  95:             sizeBuf, "-bw", wdBuf, reverse ? "-rv" : (char *) 0,
  96:             (char *) 0);
  97: 
  98:     } else {
  99:         if (!keepMasterOpen) close(ttyMasterPty);
 100: 
 101:         /* Open the slave end of the pty */
 102: 
 103:         ttyName[5] = 't';   /* Change /dev/pty?? to /dev/tty?? */
 104: 
 105:         t->file = open(ttyName, O_RDWR, 0777);
 106: 
 107:         if (t->file < 0) {
 108:         /* Couldn't open the tty--better get rid of the process */
 109:         kill (t->pid, SIGINT);
 110:         return 0;
 111:         }
 112: 
 113:         /* Read the windowid from the pty */
 114: 
 115:         len = 0;
 116:         while ((bytesRead = read(t->file, inputBuffer + len,
 117:             sizeof(Window) - len)) > 0) len += bytesRead;
 118: 
 119:         /* Flush the rest of the garbahge */
 120: 
 121:         ioctl(t->file, TIOCFLUSH, (struct sgttyb *) NULL);
 122: 
 123:         /* the data consists of a binary window ID */
 124: 
 125:         t->w = *(Window *) inputBuffer;
 126:     }
 127:     return 1;
 128: #undef BUFSIZE
 129: }
 130: 
 131: int GetPty(name)
 132:     char *name;
 133: {
 134:     register int devindex, letter;
 135:     int fd;
 136: 
 137:     strcpy(name, "/dev/ptyp0");
 138: 
 139:     for (letter = 0; letter < 4; letter++) {
 140:         name[8] = "pqrs"[letter];
 141: 
 142:         for (devindex = 0; devindex < 16; devindex++) {
 143:         name[9] = "0123456789abcdef"[devindex];
 144:         if ((fd = open (name, O_RDWR)) >= 0) return fd;
 145:         }
 146:     }
 147: 
 148:     return -1;
 149: }
 150: 
 151: DestroyTTYWindow(t)
 152:     TTYWindow *t;
 153: {
 154:     /* close the tty; this should cause the xterm to terminate with an I/O error */
 155:     close(t->file);
 156:     free(t);
 157: }
 158: 
 159: TTYPutString(t, str)
 160:     TTYWindow *t;
 161:     char *str;
 162: {
 163:     write(t->file, str, strlen(str));
 164: }
 165: 
 166: TTYPutChar(t, ch)
 167:     TTYWindow *t;
 168:     char ch;
 169: {
 170:     write(t->file, &ch, 1);
 171: }
 172: 
 173: TTYPrintf(t, format, args)
 174:     TTYWindow *t;
 175:     char *format;
 176: {
 177: #define TTY_BUFSIZE 2048
 178:     char buffer[TTY_BUFSIZE+1];
 179:     struct _iobuf _strbuf;
 180: 
 181:     _strbuf._flag = _IOWRT+_IOSTRG;
 182:     _strbuf._ptr = buffer;
 183:     _strbuf._cnt = TTY_BUFSIZE;
 184:     _doprnt(format, &args, &_strbuf);
 185:     _strbuf._cnt++;     /* Be sure there's room for the \0 */
 186:     putc('\0', &_strbuf);
 187:     TTYPutString(t, buffer);
 188: #undef TTY_BUFSIZE
 189: }
 190: 
 191: static initial_stdout = -1;
 192: 
 193: SetStdout(t)
 194:     TTYWindow *t;
 195: {
 196:     if (initial_stdout == -1) initial_stdout = stdout->_file;
 197:     fflush(stdout);
 198:     stdout->_file = t->file;
 199: }
 200: 
 201: ResetStdout()
 202: {
 203:     fflush(stdout);
 204:     stdout->_file = initial_stdout;
 205:     initial_stdout = -1;
 206: }
 207: 
 208: #define CMASK 0377
 209: 
 210: int TTYGetChar(t)
 211:     TTYWindow *t;
 212: {
 213:     char c;
 214: 
 215:     if (read(t->file, &c, 1) > 0)
 216:         return (c & CMASK);
 217:     else return (EOF);
 218: }
 219: 
 220: char *TTYGetString(t, str, n)
 221:     register TTYWindow *t;
 222:     char *str;
 223:     register int n;
 224: {
 225:     register char *cs;
 226: 
 227:     cs = str;
 228:     while (--n > 0 && read(t->file, cs, 1) > 0) {
 229:         if (*cs++ == '\n') break;
 230:     }
 231: 
 232:     if (cs == str) return NULL;
 233: 
 234:     *cs = '\0';
 235:     return str;
 236: 
 237: }

Defined functions

CreateTTYWindow defined in line 46; used 1 times
DestroyTTYWindow defined in line 151; never used
GetPty defined in line 131; used 1 times
  • in line 84
ResetStdout defined in line 201; never used
SetStdout defined in line 193; never used
Start_slave_xterm defined in line 69; used 1 times
  • in line 56
TTYGetChar defined in line 210; never used
TTYGetString defined in line 220; never used
TTYPrintf defined in line 173; never used
TTYPutChar defined in line 166; never used
TTYPutString defined in line 159; used 1 times

Defined variables

keepMasterOpen defined in line 67; used 1 times
  • in line 99
rcsid_Xttylib_c defined in line 2; never used
ttyMasterPty defined in line 66; used 4 times

Defined macros

BUFSIZE defined in line 75; used 6 times
CMASK defined in line 208; used 1 times
TTY_BUFSIZE defined in line 177; used 3 times
Last modified: 1986-02-01
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