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