git.distorted.org.uk Git - u/mdw/putty/blob - ldisc.c

   1 #include <windows.h>
   2 #include <stdio.h>
   3 #include <ctype.h>
   4
   5 #include "putty.h"
   6
   7 /*
   8  * ldisc.c: PuTTY line disciplines
   9  */
  10
  11 static void c_write (char *buf, int len) {
  12     while (len--) {
  13         int new_head = (inbuf_head + 1) & INBUF_MASK;
  14         int c = (unsigned char) *buf;
  15         if (new_head != inbuf_reap) {
  16             inbuf[inbuf_head] = *buf++;
  17             inbuf_head = new_head;
  18         }
  19     }
  20 }
  21
  22 static char *term_buf = NULL;
  23 static int term_buflen = 0, term_bufsiz = 0, term_quotenext = 0;
  24
  25 static int plen(unsigned char c) {
  26     if ((c >= 32 && c <= 126) ||
  27         (c >= 160))
  28         return 1;
  29     else if (c < 128)
  30         return 2;                      /* ^x for some x */
  31     else
  32         return 4;                      /* <XY> for hex XY */
  33 }
  34
  35 static void pwrite(unsigned char c) {
  36     if ((c >= 32 && c <= 126) ||
  37         (c >= 160)) {
  38         char cc = (char)c;
  39         c_write(&cc, 1);
  40     } else if (c < 128) {
  41         char cc[2];
  42         cc[1] = (c == 127 ? '?' : c + 0x40);
  43         cc[0] = '^';
  44         c_write(cc, 2);
  45     } else {
  46         char cc[5];
  47         sprintf(cc, "<%02X>", c);
  48         c_write(cc, 4);
  49     }
  50 }
  51
  52 static void bsb(int n) {
  53     while (n--)
  54         c_write("\010 \010", 3);
  55 }
  56
  57 static void term_send(char *buf, int len) {
  58     while (len--) {
  59         char c;
  60         c = *buf++;
  61         switch (term_quotenext ? ' ' : c) {
  62             /*
  63              * ^h/^?: delete one char and output one BSB
  64              * ^w: delete, and output BSBs, to return to last space/nonspace
  65              * boundary
  66              * ^u: delete, and output BSBs, to return to BOL
  67              * ^r: echo "^R\n" and redraw line
  68              * ^v: quote next char
  69              * ^d: if at BOL, end of file and close connection, else send line
  70              * and reset to BOL
  71              * ^m/^j: send line-plus-\r\n and reset to BOL
  72              */
  73           case 8: case 127:            /* backspace/delete */
  74             if (term_buflen > 0) {
  75                 bsb(plen(term_buf[term_buflen-1]));
  76                 term_buflen--;
  77             }
  78             break;
  79           case 23:                     /* ^W delete word */
  80             while (term_buflen > 0) {
  81                 bsb(plen(term_buf[term_buflen-1]));
  82                 term_buflen--;
  83                 if (term_buflen > 0 &&
  84                     isspace(term_buf[term_buflen-1]) &&
  85                     !isspace(term_buf[term_buflen]))
  86                     break;
  87             }
  88             break;
  89           case 21:                     /* ^U delete line */
  90             while (term_buflen > 0) {
  91                 bsb(plen(term_buf[term_buflen-1]));
  92                 term_buflen--;
  93             }
  94             break;
  95           case 18:                     /* ^R redraw line */
  96             c_write("^R\r\n", 4);
  97             {
  98                 int i;
  99                 for (i = 0; i < term_buflen; i++)
 100                     pwrite(term_buf[i]);
 101             }
 102             break;
 103           case 22:                     /* ^V quote next char */
 104             term_quotenext = TRUE;
 105             break;
 106           case 4:                      /* ^D logout or send */
 107             if (term_buflen == 0) {
 108                 /* FIXME: eof */;
 109             } else {
 110                 back->send(term_buf, term_buflen);
 111                 term_buflen = 0;
 112             }
 113             break;
 114           case 13: case 10:            /* ^M/^J send with newline */
 115             back->send(term_buf, term_buflen);
 116             back->send("\r\n", 2);
 117             c_write("\r\n", 2);
 118             term_buflen = 0;
 119             break;
 120           default:                     /* get to this label from ^V handler */
 121             if (term_buflen >= term_bufsiz) {
 122                 term_bufsiz = term_buflen + 256;
 123                 term_buf = saferealloc(term_buf, term_bufsiz);
 124             }
 125             term_buf[term_buflen++] = c;
 126             pwrite(c);
 127             term_quotenext = FALSE;
 128             break;
 129         }
 130     }
 131 }
 132
 133 static void simple_send(char *buf, int len) {
 134     back->send(buf, len);
 135 }
 136
 137 Ldisc ldisc_term = { term_send };
 138 Ldisc ldisc_simple = { simple_send };