dist/nvi/ip/ip_read.c

   1 /*      $NetBSD$ */
   2
   3 /*-
   4  * Copyright (c) 1996
   5  *      Keith Bostic.  All rights reserved.
   6  *
   7  * See the LICENSE file for redistribution information.
   8  */
   9
  10 #include "config.h"
  11
  12 #ifndef lint
  13 static const char sccsid[] = "Id: ip_read.c,v 8.23 2001/06/25 15:19:24 skimo Exp (Berkeley) Date: 2001/06/25 15:19:24";
  14 #endif /* not lint */
  15
  16 #include <sys/types.h>
  17 #include <sys/queue.h>
  18 #include <sys/time.h>
  19
  20 #include <bitstring.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <termios.h>
  25 #include <time.h>
  26 #include <unistd.h>
  27 #include <netinet/in.h>
  28
  29 #include "../common/common.h"
  30 #include "../ex/script.h"
  31 #include "../ipc/ip.h"
  32 #include "extern.h"
  33
  34 extern GS *__global_list;
  35
  36 VIPFUNLIST const vipfuns[] = {
  37 /* VI_C_BOL         Cursor to start of line. */
  38     {"",    E_IPCOMMAND},
  39 /* VI_C_BOTTOM   2      /* Cursor to bottom. */
  40     {"",    E_IPCOMMAND},
  41 /* VI_C_DEL      3      /* Cursor delete. */
  42     {"",    E_IPCOMMAND},
  43 /* VI_C_DOWN        Cursor down N lines: IPO_INT. */
  44     {"1",   E_IPCOMMAND},
  45 /* VI_C_EOL      5      /* Cursor to end of line. */
  46     {"",    E_IPCOMMAND},
  47 /* VI_C_INSERT   6      /* Cursor: enter insert mode. */
  48     {"",    E_IPCOMMAND},
  49 /* VI_C_LEFT     7      /* Cursor left. */
  50     {"",    E_IPCOMMAND},
  51 /* VI_C_PGDOWN   8      /* Cursor down N pages: IPO_INT. */
  52     {"1",   E_IPCOMMAND},
  53 /* VI_C_PGUP     9      /* Cursor up N lines: IPO_INT. */
  54     {"1",   E_IPCOMMAND},
  55 /* VI_C_RIGHT   10      /* Cursor right. */
  56     {"",    E_IPCOMMAND},
  57 /* VI_C_SEARCH  11      /* Cursor: search: IPO_INT, IPO_STR. */
  58     {"a1",  E_IPCOMMAND},
  59 /* VI_C_SETTOP  12      /* Cursor: set screen top line: IPO_INT. */
  60     {"1",   E_IPCOMMAND},
  61 /* VI_C_TOP     13      /* Cursor to top. */
  62     {"",    E_IPCOMMAND},
  63 /* VI_C_UP              14      /* Cursor up N lines: IPO_INT. */
  64     {"1",   E_IPCOMMAND},
  65 /* VI_EDIT              15      /* Edit a file: IPO_STR. */
  66     {"a",   E_IPCOMMAND},
  67 /* VI_EDITOPT   16      /* Edit option: 2 * IPO_STR, IPO_INT. */
  68     {"ab1", E_IPCOMMAND},
  69 /* VI_EDITSPLIT 17      /* Split to a file: IPO_STR. */
  70     {"a",   E_IPCOMMAND},
  71 /* VI_EOF               18      /* End of input (NOT ^D). */
  72     {"",    E_EOF},
  73 /* VI_ERR               19      /* Input error. */
  74     {"",    E_ERR},
  75 /* VI_FLAGS         Flags */
  76     {"1",   E_FLAGS},
  77 /* VI_INTERRUPT 20      /* Interrupt. */
  78     {"",    E_INTERRUPT},
  79 /* VI_MOUSE_MOVE        21      /* Mouse click move: IPO_INT, IPO_INT. */
  80     {"12",  E_IPCOMMAND},
  81 /* VI_QUIT              22      /* Quit. */
  82     {"",    E_IPCOMMAND},
  83 /* VI_RESIZE        Screen resize: IPO_INT, IPO_INT. */
  84     {"12",  E_WRESIZE},
  85 /* VI_SEL_END   24      /* Select end: IPO_INT, IPO_INT. */
  86     {"12",  E_IPCOMMAND},
  87 /* VI_SEL_START 25      /* Select start: IPO_INT, IPO_INT. */
  88     {"12",  E_IPCOMMAND},
  89 /* VI_SIGHUP    26      /* SIGHUP. */
  90     {"",    E_SIGHUP},
  91 /* VI_SIGTERM   27      /* SIGTERM. */
  92     {"",    E_SIGTERM},
  93 /* VI_STRING        Input string: IPO_STR. */
  94     {"a",   E_STRING},
  95 /* VI_TAG               29      /* Tag. */
  96     {"",    E_IPCOMMAND},
  97 /* VI_TAGAS     30      /* Tag to a string: IPO_STR. */
  98     {"a",   E_IPCOMMAND},
  99 /* VI_TAGSPLIT  31      /* Split to a tag. */
 100     {"",    E_IPCOMMAND},
 101 /* VI_UNDO              32      /* Undo. */
 102     {"",    E_IPCOMMAND},
 103 /* VI_WQ                33      /* Write and quit. */
 104     {"",    E_IPCOMMAND},
 105 /* VI_WRITE     34      /* Write. */
 106     {"",    E_IPCOMMAND},
 107 /* VI_WRITEAS   35      /* Write as another file: IPO_STR. */
 108     {"a",   E_IPCOMMAND},
 109 /* VI_EVENT_SUP */
 110 };
 111
 112 typedef enum { INP_OK=0, INP_EOF, INP_ERR, INP_TIMEOUT } input_t;
 113
 114 static input_t  ip_read __P((SCR *, IP_PRIVATE *, struct timeval *, int, int*));
 115 static int      ip_resize __P((SCR *, u_int32_t, u_int32_t));
 116 static int      ip_trans __P((SCR *, IP_PRIVATE *, EVENT *));
 117
 118 /*
 119  * ip_event --
 120  *      Return a single event.
 121  *
 122  * PUBLIC: int ip_event __P((SCR *, EVENT *, u_int32_t, int));
 123  */
 124 int
 125 ip_event(SCR *sp, EVENT *evp, u_int32_t flags, int ms)
 126 {
 127         return ip_wevent(sp->wp, sp, evp, flags, ms);
 128 }
 129
 130 /*
 131  * XXX probably better to require new_window to send size
 132  *     so we never have to call ip_wevent with sp == NULL
 133  *
 134  * ip_wevent --
 135  *      Return a single event.
 136  *
 137  * PUBLIC: int ip_wevent __P((WIN *, SCR *, EVENT *, u_int32_t, int));
 138  */
 139 int
 140 ip_wevent(WIN *wp, SCR *sp, EVENT *evp, u_int32_t flags, int ms)
 141 {
 142         IP_PRIVATE *ipp;
 143         struct timeval t, *tp;
 144         int termread;
 145         int nr;
 146
 147         if (LF_ISSET(EC_INTERRUPT)) {           /* XXX */
 148                 evp->e_event = E_TIMEOUT;
 149                 return (0);
 150         }
 151
 152         ipp = sp == NULL ? WIPP(wp) : IPP(sp);
 153
 154         /* Discard the last command. */
 155         if (ipp->iskip != 0) {
 156                 ipp->iblen -= ipp->iskip;
 157                 memmove(ipp->ibuf, ipp->ibuf + ipp->iskip, ipp->iblen);
 158                 ipp->iskip = 0;
 159         }
 160
 161         termread = F_ISSET(ipp, IP_IN_EX) ||
 162                     (sp && F_ISSET(sp, SC_SCR_EXWROTE));
 163
 164         /* Process possible remaining commands */
 165         if (!termread && ipp->iblen >= IPO_CODE_LEN && ip_trans(sp, ipp, evp))
 166                 return 0;
 167
 168         /* Set timer. */
 169         if (ms == 0)
 170                 tp = NULL;
 171         else {
 172                 t.tv_sec = ms / 1000;
 173                 t.tv_usec = (ms % 1000) * 1000;
 174                 tp = &t;
 175         }
 176
 177         /* Read input events. */
 178         for (;;) {
 179                 switch (ip_read(sp, ipp, tp, termread, &nr)) {
 180                 case INP_OK:
 181                         if (termread) {
 182                                 evp->e_csp = ipp->tbuf;
 183                                 evp->e_len = nr;
 184                                 evp->e_event = E_STRING;
 185                         } else if (!ip_trans(sp, ipp, evp))
 186                                 continue;
 187                         break;
 188                 case INP_EOF:
 189                         evp->e_event = E_EOF;
 190                         break;
 191                 case INP_ERR:
 192                         evp->e_event = E_ERR;
 193                         break;
 194                 case INP_TIMEOUT:
 195                         evp->e_event = E_TIMEOUT;
 196                         break;
 197                 default:
 198                         abort();
 199                 }
 200                 break;
 201         }
 202         return (0);
 203 }
 204
 205 /*
 206  * ip_read --
 207  *      Read characters from the input.
 208  */
 209 static input_t
 210 ip_read(SCR *sp, IP_PRIVATE *ipp, struct timeval *tp, int termread, int *nr)
 211 {
 212         struct timeval poll;
 213         GS *gp;
 214         fd_set rdfd;
 215         input_t rval;
 216         size_t blen;
 217         int maxfd;
 218         char *bp;
 219         int fd;
 220         CHAR_T *wp;
 221         size_t wlen;
 222
 223         gp = sp == NULL ? __global_list : sp->gp;
 224         bp = ipp->ibuf + ipp->iblen;
 225         blen = sizeof(ipp->ibuf) - ipp->iblen;
 226         fd = termread ? ipp->t_fd : ipp->i_fd;
 227
 228         /*
 229          * 1: A read with an associated timeout, e.g., trying to complete
 230          *    a map sequence.  If input exists, we fall into #2.
 231          */
 232         FD_ZERO(&rdfd);
 233         poll.tv_sec = 0;
 234         poll.tv_usec = 0;
 235         if (tp != NULL) {
 236                 FD_SET(fd, &rdfd);
 237                 switch (select(fd + 1,
 238                     &rdfd, NULL, NULL, tp == NULL ? &poll : tp)) {
 239                 case 0:
 240                         return (INP_TIMEOUT);
 241                 case -1:
 242                         goto err;
 243                 default:
 244                         break;
 245                 }
 246         }
 247
 248         /*
 249          * 2: Wait for input.
 250          *
 251          * Select on the command input and scripting window file descriptors.
 252          * It's ugly that we wait on scripting file descriptors here, but it's
 253          * the only way to keep from locking out scripting windows.
 254          */
 255         if (sp != NULL && F_ISSET(gp, G_SCRWIN)) {
 256                 FD_ZERO(&rdfd);
 257                 FD_SET(fd, &rdfd);
 258                 maxfd = fd;
 259                 if (sscr_check_input(sp, &rdfd, maxfd))
 260                         goto err;
 261         }
 262
 263         /*
 264          * 3: Read the input.
 265          */
 266         switch (*nr = read(fd, termread ? (char *)ipp->tbuf : bp,
 267                               termread ? sizeof(ipp->tbuf)/sizeof(CHAR_T)
 268                                        : blen)) {
 269         case  0:                                /* EOF. */
 270                 rval = INP_EOF;
 271                 break;
 272         case -1:                                /* Error or interrupt. */
 273 err:            rval = INP_ERR;
 274                 msgq(sp, M_SYSERR, "input");
 275                 break;
 276         default:                                /* Input characters. */
 277                 if (!termread) ipp->iblen += *nr;
 278                 else {
 279                         CHAR2INT(sp, (char *)ipp->tbuf, *nr, wp, wlen);
 280                         MEMMOVEW(ipp->tbuf, wp, wlen);
 281                 }
 282                 rval = INP_OK;
 283                 break;
 284         }
 285         return (rval);
 286 }
 287
 288 /*
 289  * ip_trans --
 290  *      Translate messages into events.
 291  */
 292 static int
 293 ip_trans(SCR *sp, IP_PRIVATE *ipp, EVENT *evp)
 294 {
 295         u_int32_t skip, val;
 296         char *fmt;
 297         CHAR_T *wp;
 298         size_t wlen;
 299
 300         if (ipp->ibuf[0] == CODE_OOB ||
 301             ipp->ibuf[0] >= VI_EVENT_SUP)
 302         {
 303                 /*
 304                  * XXX: Protocol is out of sync?
 305                  */
 306                 abort();
 307         }
 308         fmt = vipfuns[ipp->ibuf[0]-1].format;
 309         evp->e_event = vipfuns[ipp->ibuf[0]-1].e_event;
 310         evp->e_ipcom = ipp->ibuf[0];
 311
 312         for (skip = IPO_CODE_LEN; *fmt != '\0'; ++fmt)
 313                 switch (*fmt) {
 314                 case '1':
 315                 case '2':
 316                         if (ipp->iblen < skip + IPO_INT_LEN)
 317                                 return (0);
 318                         memcpy(&val, ipp->ibuf + skip, IPO_INT_LEN);
 319                         val = ntohl(val);
 320                         if (*fmt == '1')
 321                                 evp->e_val1 = val;
 322                         else
 323                                 evp->e_val2 = val;
 324                         skip += IPO_INT_LEN;
 325                         break;
 326                 case 'a':
 327                 case 'b':
 328                         if (ipp->iblen < skip + IPO_INT_LEN)
 329                                 return (0);
 330                         memcpy(&val, ipp->ibuf + skip, IPO_INT_LEN);
 331                         val = ntohl(val);
 332                         skip += IPO_INT_LEN;
 333                         if (ipp->iblen < skip + val)
 334                                 return (0);
 335                         if (*fmt == 'a') {
 336                                 CHAR2INT(sp, ipp->ibuf + skip, val,
 337                                          wp, wlen);
 338                                 MEMCPYW(ipp->tbuf, wp, wlen);
 339                                 evp->e_str1 = ipp->tbuf;
 340                                 evp->e_len1 = wlen;
 341                         } else {
 342                                 CHAR2INT(sp, ipp->ibuf + skip, val,
 343                                          wp, wlen);
 344                                 MEMCPYW(ipp->tbuf, wp, wlen);
 345                                 evp->e_str2 = ipp->tbuf;
 346                                 evp->e_len2 = wlen;
 347                         }
 348                         skip += val;
 349                         break;
 350                 }
 351
 352         ipp->iskip = skip;
 353
 354         if (evp->e_event == E_WRESIZE)
 355                 (void)ip_resize(sp, evp->e_val1, evp->e_val2);
 356
 357         return (1);
 358 }
 359
 360 /*
 361  * ip_resize --
 362  *      Reset the options for a resize event.
 363  */
 364 static int
 365 ip_resize(SCR *sp, u_int32_t lines, u_int32_t columns)
 366 {
 367         GS *gp;
 368         int rval;
 369
 370         /*
 371          * XXX
 372          * The IP screen has to know the lines and columns before anything
 373          * else happens.  So, we may not have a valid SCR pointer, and we
 374          * have to deal with that.
 375          */
 376         if (sp == NULL) {
 377                 gp = __global_list;
 378                 OG_VAL(gp, GO_LINES) = OG_D_VAL(gp, GO_LINES) = lines;
 379                 OG_VAL(gp, GO_COLUMNS) = OG_D_VAL(gp, GO_COLUMNS) = columns;
 380                 return (0);
 381         }
 382
 383         rval = api_opts_set(sp, L("lines"), NULL, lines, 0);
 384         if (api_opts_set(sp, L("columns"), NULL, columns, 0))
 385                 rval = 1;
 386         return (rval);
 387 }