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