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

   1 #include <windows.h>
   2 #ifndef AUTO_WINSOCK
   3 #ifdef WINSOCK_TWO
   4 #include <winsock2.h>
   5 #else
   6 #include <winsock.h>
   7 #endif
   8 #endif
   9 #include <stdio.h>
  10 #include <ctype.h>
  11
  12 #include "putty.h"
  13
  14 /*
  15  * ldisc.c: PuTTY line disciplines
  16  */
  17
  18 static void c_write (char *buf, int len) {
  19     from_backend(0, buf, len);
  20 }
  21
  22 static void c_write1 (char c) {
  23     c_write(&c, 1);
  24 }
  25
  26 static char *term_buf = NULL;
  27 static int term_buflen = 0, term_bufsiz = 0, term_quotenext = 0;
  28
  29 static int plen(unsigned char c) {
  30     if ((c >= 32 && c <= 126) ||
  31         (c >= 160))
  32         return 1;
  33     else if (c < 128)
  34         return 2;                      /* ^x for some x */
  35     else
  36         return 4;                      /* <XY> for hex XY */
  37 }
  38
  39 static void pwrite(unsigned char c) {
  40     if ((c >= 32 && c <= 126) ||
  41         (c >= 160)) {
  42         c_write1(c);
  43     } else if (c < 128) {
  44         char cc[2];
  45         cc[1] = (c == 127 ? '?' : c + 0x40);
  46         cc[0] = '^';
  47         c_write(cc, 2);
  48     } else {
  49         char cc[5];
  50         sprintf(cc, "<%02X>", c);
  51         c_write(cc, 4);
  52     }
  53 }
  54
  55 static void bsb(int n) {
  56     while (n--)
  57         c_write("\010 \010", 3);
  58 }
  59
  60 #define CTRL(x) (x^'@')
  61
  62 static void term_send(char *buf, int len) {
  63     while (len--) {
  64         char c;
  65         c = *buf++;
  66         switch (term_quotenext ? ' ' : c) {
  67             /*
  68              * ^h/^?: delete one char and output one BSB
  69              * ^w: delete, and output BSBs, to return to last space/nonspace
  70              * boundary
  71              * ^u: delete, and output BSBs, to return to BOL
  72              * ^c: Do a ^u then send a telnet IP
  73              * ^z: Do a ^u then send a telnet SUSP
  74              * ^\: Do a ^u then send a telnet ABORT
  75              * ^r: echo "^R\n" and redraw line
  76              * ^v: quote next char
  77              * ^d: if at BOL, end of file and close connection, else send line
  78              * and reset to BOL
  79              * ^m: send line-plus-\r\n and reset to BOL
  80              */
  81           case CTRL('H'): case CTRL('?'):      /* backspace/delete */
  82             if (term_buflen > 0) {
  83                 bsb(plen(term_buf[term_buflen-1]));
  84                 term_buflen--;
  85             }
  86             break;
  87           case CTRL('W'):                      /* delete word */
  88             while (term_buflen > 0) {
  89                 bsb(plen(term_buf[term_buflen-1]));
  90                 term_buflen--;
  91                 if (term_buflen > 0 &&
  92                     isspace(term_buf[term_buflen-1]) &&
  93                     !isspace(term_buf[term_buflen]))
  94                     break;
  95             }
  96             break;
  97           case CTRL('U'):              /* delete line */
  98           case CTRL('C'):              /* Send IP */
  99           case CTRL('\\'):             /* Quit */
 100           case CTRL('Z'):              /* Suspend */
 101             while (term_buflen > 0) {
 102                 bsb(plen(term_buf[term_buflen-1]));
 103                 term_buflen--;
 104             }
 105             back->special (TS_EL);
 106             if( c == CTRL('C') )  back->special (TS_IP);
 107             if( c == CTRL('Z') )  back->special (TS_SUSP);
 108             if( c == CTRL('\\') ) back->special (TS_ABORT);
 109             break;
 110           case CTRL('R'):              /* redraw line */
 111             c_write("^R\r\n", 4);
 112             {
 113                 int i;
 114                 for (i = 0; i < term_buflen; i++)
 115                     pwrite(term_buf[i]);
 116             }
 117             break;
 118           case CTRL('V'):              /* quote next char */
 119             term_quotenext = TRUE;
 120             break;
 121           case CTRL('D'):              /* logout or send */
 122             if (term_buflen == 0) {
 123                 back->special (TS_EOF);
 124             } else {
 125                 back->send(term_buf, term_buflen);
 126                 term_buflen = 0;
 127             }
 128             break;
 129           case CTRL('M'):              /* send with newline */
 130             if (term_buflen > 0)
 131                 back->send(term_buf, term_buflen);
 132             if (cfg.protocol == PROT_RAW)
 133                 back->send("\r\n", 2);
 134             else
 135                 back->send("\r", 1);
 136             c_write("\r\n", 2);
 137             term_buflen = 0;
 138             break;
 139           default:                     /* get to this label from ^V handler */
 140             if (term_buflen >= term_bufsiz) {
 141                 term_bufsiz = term_buflen + 256;
 142                 term_buf = saferealloc(term_buf, term_bufsiz);
 143             }
 144             term_buf[term_buflen++] = c;
 145             pwrite(c);
 146             term_quotenext = FALSE;
 147             break;
 148         }
 149     }
 150 }
 151
 152 static void simple_send(char *buf, int len) {
 153     if( term_buflen != 0 )
 154     {
 155         back->send(term_buf, term_buflen);
 156         while (term_buflen > 0) {
 157             bsb(plen(term_buf[term_buflen-1]));
 158             term_buflen--;
 159         }
 160     }
 161     if (len > 0)
 162         back->send(buf, len);
 163 }
 164
 165 Ldisc ldisc_term = { term_send };
 166 Ldisc ldisc_simple = { simple_send };