1 /* vi:set ts=8 sts=4 sw=4 noet: 2 * 3 * VIM - Vi IMproved by Bram Moolenaar 4 * VMS port by Henk Elbers 5 * VMS deport by Zoltan Arpadffy 6 * 7 * Do ":help uganda" in Vim to read copying and usage conditions. 8 * Do ":help credits" in Vim to see a list of people who contributed. 9 * See README.txt for an overview of the Vim source code. 10 */ 11 12 #include "vim.h" 13 14 // define _generic_64 for use in time functions 15 #if !defined(VAX) && !defined(PROTO) 16 # include <gen64def.h> 17 #else 18 // based on Alpha's gen64def.h; the file is absent on VAX 19 typedef struct _generic_64 { 20 # pragma __nomember_alignment 21 __union { // You can treat me as... 22 // long long is not available on VAXen 23 // unsigned __int64 gen64$q_quadword; ...a single 64-bit value, or 24 25 unsigned int gen64$l_longword [2]; // ...two 32-bit values, or 26 unsigned short int gen64$w_word [4]; // ...four 16-bit values 27 } gen64$r_quad_overlay; 28 } GENERIC_64; 29 #endif 30 31 typedef struct 32 { 33 char class; 34 char type; 35 short width; 36 union 37 { 38 struct 39 { 40 char _basic[3]; 41 char length; 42 } y; 43 int basic; 44 } x; 45 int extended; 46 } TT_MODE; 47 48 typedef struct 49 { 50 short buflen; 51 short itemcode; 52 char *bufadrs; 53 int *retlen; 54 } ITEM; 55 56 typedef struct 57 { 58 ITEM equ; 59 int nul; 60 } ITMLST1; 61 62 typedef struct 63 { 64 ITEM index; 65 ITEM string; 66 int nul; 67 } ITMLST2; 68 69 static TT_MODE orgmode; 70 static short iochan; // TTY I/O channel 71 static short iosb[4]; // IO status block 72 73 static int vms_match_num = 0; 74 static int vms_match_free = 0; 75 static char_u **vms_fmatch = NULL; 76 static char *Fspec_Rms; // rms file spec, passed implicitly between routines 77 78 79 80 static TT_MODE get_tty(void); 81 static void set_tty(int row, int col); 82 83 #define EXPL_ALLOC_INC 64 84 85 #define EQN(S1,S2,LN) (strncmp(S1,S2,LN) == 0) 86 #define SKIP_FOLLOWING_SLASHES(Str) do { while (Str[1] == '/') ++Str; } while (0) 87 88 89 /* 90 * vul_desc vult een descriptor met een string en de lengte 91 * hier van. 92 */ 93 static void 94 vul_desc(DESC *des, char *str) 95 { 96 des->dsc$b_dtype = DSC$K_DTYPE_T; 97 des->dsc$b_class = DSC$K_CLASS_S; 98 des->dsc$a_pointer = str; 99 des->dsc$w_length = str ? strlen(str) : 0; 100 } 101 102 /* 103 * vul_item vult een item met een aantal waarden 104 */ 105 static void 106 vul_item(ITEM *itm, short len, short cod, char *adr, int *ret) 107 { 108 itm->buflen = len; 109 itm->itemcode = cod; 110 itm->bufadrs = adr; 111 itm->retlen = ret; 112 } 113 114 void 115 mch_settmode(tmode_T tmode) 116 { 117 int status; 118 119 if ( tmode == TMODE_RAW ) 120 set_tty(0, 0); 121 else{ 122 switch (orgmode.width) 123 { 124 case 132: OUT_STR_NF((char_u *)"\033[?3h\033>"); break; 125 case 80: OUT_STR_NF((char_u *)"\033[?3l\033>"); break; 126 default: break; 127 } 128 out_flush(); 129 status = sys$qiow(0, iochan, IO$_SETMODE, iosb, 0, 0, 130 &orgmode, sizeof(TT_MODE), 0,0,0,0); 131 if (status!=SS$_NORMAL || (iosb[0]&0xFFFF)!=SS$_NORMAL) 132 return; 133 (void)sys$dassgn(iochan); 134 iochan = 0; 135 } 136 } 137 138 static void 139 set_tty(int row, int col) 140 { 141 int status; 142 TT_MODE newmode; // New TTY mode bits 143 static short first_time = TRUE; 144 145 if (first_time) 146 { 147 orgmode = get_tty(); 148 first_time = FALSE; 149 } 150 newmode = get_tty(); 151 if (col) 152 newmode.width = col; 153 if (row) 154 newmode.x.y.length = row; 155 newmode.x.basic |= (TT$M_NOECHO | TT$M_HOSTSYNC); 156 newmode.x.basic &= ~TT$M_TTSYNC; 157 newmode.extended |= TT2$M_PASTHRU; 158 status = sys$qiow(0, iochan, IO$_SETMODE, iosb, 0, 0, 159 &newmode, sizeof(newmode), 0, 0, 0, 0); 160 if (status!=SS$_NORMAL || (iosb[0]&0xFFFF)!=SS$_NORMAL) 161 return; 162 } 163 164 static TT_MODE 165 get_tty(void) 166 { 167 168 static $DESCRIPTOR(odsc,"SYS$OUTPUT"); // output descriptor 169 170 int status; 171 TT_MODE tt_mode; 172 173 if (!iochan) 174 status = sys$assign(&odsc,&iochan,0,0); 175 176 status = sys$qiow(0, iochan, IO$_SENSEMODE, iosb, 0, 0, 177 &tt_mode, sizeof(tt_mode), 0, 0, 0, 0); 178 if (status != SS$_NORMAL || (iosb[0] & 0xFFFF) != SS$_NORMAL) 179 { 180 tt_mode.width = 0; 181 tt_mode.type = 0; 182 tt_mode.class = 0; 183 tt_mode.x.basic = 0; 184 tt_mode.x.y.length = 0; 185 tt_mode.extended = 0; 186 } 187 return(tt_mode); 188 } 189 190 /* 191 * Get the current window size in Rows and Columns. 192 */ 193 int 194 mch_get_shellsize(void) 195 { 196 TT_MODE tmode; 197 198 tmode = get_tty(); // get size from VMS 199 Columns = tmode.width; 200 Rows = tmode.x.y.length; 201 return OK; 202 } 203 204 /* 205 * Try to set the window size to Rows and new_Columns. 206 */ 207 void 208 mch_set_shellsize(void) 209 { 210 set_tty(Rows, Columns); 211 switch (Columns) 212 { 213 case 132: OUT_STR_NF((char_u *)"\033[?3h\033>"); break; 214 case 80: OUT_STR_NF((char_u *)"\033[?3l\033>"); break; 215 default: break; 216 } 217 out_flush(); 218 screen_start(); 219 } 220 221 char_u * 222 mch_getenv(char_u *lognam) 223 { 224 DESC d_file_dev, d_lognam ; 225 static char buffer[LNM$C_NAMLENGTH+1]; 226 char_u *cp = NULL; 227 unsigned long attrib; 228 int lengte = 0, dum = 0, idx = 0; 229 ITMLST2 itmlst; 230 char *sbuf = NULL; 231 232 vul_desc(&d_lognam, (char *)lognam); 233 vul_desc(&d_file_dev, "LNM$FILE_DEV"); 234 attrib = LNM$M_CASE_BLIND; 235 vul_item(&itmlst.index, sizeof(int), LNM$_INDEX, (char *)&idx, &dum); 236 vul_item(&itmlst.string, LNM$C_NAMLENGTH, LNM$_STRING, buffer, &lengte); 237 itmlst.nul = 0; 238 if (sys$trnlnm(&attrib, &d_file_dev, &d_lognam, NULL,&itmlst) == SS$_NORMAL) 239 { 240 buffer[lengte] = '\0'; 241 if (cp = alloc(lengte + 1)) 242 strcpy((char *)cp, buffer); 243 return(cp); 244 } 245 else if ((sbuf = getenv((char *)lognam))) 246 { 247 lengte = strlen(sbuf) + 1; 248 cp = alloc(lengte); 249 if (cp) 250 strcpy((char *)cp, sbuf); 251 return cp; 252 } 253 else 254 return(NULL); 255 } 256 257 /* 258 * mch_setenv VMS version of setenv() 259 */ 260 int 261 mch_setenv(char *var, char *value, int x) 262 { 263 int res, dum; 264 long attrib = 0L; 265 char acmode = PSL$C_SUPER; // needs SYSNAM privilege 266 DESC tabnam, lognam; 267 ITMLST1 itmlst; 268 269 vul_desc(&tabnam, "LNM$JOB"); 270 vul_desc(&lognam, var); 271 vul_item(&itmlst.equ, value ? strlen(value) : 0, value ? LNM$_STRING : 0, 272 value, &dum); 273 itmlst.nul = 0; 274 res = sys$crelnm(&attrib, &tabnam, &lognam, &acmode, &itmlst); 275 return((res == 1) ? 0 : -1); 276 } 277 278 int 279 vms_sys(char *cmd, char *out, char *inp) 280 { 281 DESC cdsc, odsc, idsc; 282 long status; 283 284 if (cmd) 285 vul_desc(&cdsc, cmd); 286 if (out) 287 vul_desc(&odsc, out); 288 if (inp) 289 vul_desc(&idsc, inp); 290 291 lib$spawn(cmd ? &cdsc : NULL, // command string 292 inp ? &idsc : NULL, // input file 293 out ? &odsc : NULL, // output file 294 0, 0, 0, &status, 0, 0, 0, 0, 0, 0); 295 return status; 296 } 297 298 /* 299 * Convert string to lowercase - most often filename 300 */ 301 char * 302 vms_tolower( char *name ) 303 { 304 int i,nlen = strlen(name); 305 for (i = 0; i < nlen; i++) 306 name[i] = TOLOWER_ASC(name[i]); 307 return name; 308 } 309 310 /* 311 * Convert VMS system() or lib$spawn() return code to Unix-like exit value. 312 */ 313 int 314 vms_sys_status(int status) 315 { 316 if (status != SS$_NORMAL && (status & STS$M_SUCCESS) == 0) 317 return status; // Command failed. 318 return 0; 319 } 320 321 /* 322 * vms_read() 323 * function for low level char input 324 * 325 * Returns: input length 326 */ 327 int 328 vms_read(char *inbuf, size_t nbytes) 329 { 330 int status, function, len; 331 TT_MODE tt_mode; 332 ITEM itmlst[2]; // terminates on everything 333 static long trm_mask[8] = {-1, -1, -1, -1, -1, -1, -1, -1}; 334 335 // whatever happened earlier we need an iochan here 336 if (!iochan) 337 tt_mode = get_tty(); 338 339 // important: clean the inbuf 340 memset(inbuf, 0, nbytes); 341 342 // set up the itemlist for the first read 343 vul_item(&itmlst[0], 0, TRM$_MODIFIERS, 344 (char *)( TRM$M_TM_NOECHO | TRM$M_TM_NOEDIT | 345 TRM$M_TM_NOFILTR | TRM$M_TM_TRMNOECHO | 346 TRM$M_TM_NORECALL) , 0); 347 vul_item(&itmlst[1], sizeof(trm_mask), TRM$_TERM, (char *)&trm_mask, 0); 348 349 // wait forever for a char 350 function = (IO$_READLBLK | IO$M_EXTEND); 351 status = sys$qiow(0, iochan, function, &iosb, 0, 0, 352 inbuf, nbytes-1, 0, 0, &itmlst, sizeof(itmlst)); 353 len = strlen(inbuf); // how many chars we got? 354 355 // read immediately the rest in the IO queue 356 function = (IO$_READLBLK | IO$M_TIMED | IO$M_ESCAPE | IO$M_NOECHO | IO$M_NOFILTR); 357 status = sys$qiow(0, iochan, function, &iosb, 0, 0, 358 inbuf+len, nbytes-1-len, 0, 0, 0, 0); 359 360 len = strlen(inbuf); // return the total length 361 362 return len; 363 } 364 365 /* 366 * vms_wproc() is called for each matching filename by decc$to_vms(). 367 * We want to save each match for later retrieval. 368 * 369 * Returns: 1 - continue finding matches 370 * 0 - stop trying to find any further matches 371 */ 372 static int 373 vms_wproc(char *name, int val) 374 { 375 int i; 376 static int vms_match_alloced = 0; 377 378 if (val == DECC$K_FOREIGN ) // foreign non VMS files are not counting 379 return 1; 380 381 // accept all DECC$K_FILE and DECC$K_DIRECTORY 382 if (vms_match_num == 0) { 383 // first time through, setup some things 384 if (NULL == vms_fmatch) { 385 vms_fmatch = ALLOC_MULT(char_u *, EXPL_ALLOC_INC); 386 if (!vms_fmatch) 387 return 0; 388 vms_match_alloced = EXPL_ALLOC_INC; 389 vms_match_free = EXPL_ALLOC_INC; 390 } 391 else { 392 // re-use existing space 393 vms_match_free = vms_match_alloced; 394 } 395 } 396 397 // make matches look uniform 398 vms_remove_version(name); 399 name=vms_tolower(name); 400 401 // if name already exists, don't add it 402 for (i = 0; i<vms_match_num; i++) { 403 if (0 == STRCMP((char_u *)name,vms_fmatch[i])) 404 return 1; 405 } 406 if (--vms_match_free == 0) { 407 char_u **old_vms_fmatch = vms_fmatch; 408 409 // add more space to store matches 410 vms_match_alloced += EXPL_ALLOC_INC; 411 vms_fmatch = vim_realloc(old_vms_fmatch, 412 sizeof(char **) * vms_match_alloced); 413 if (!vms_fmatch) 414 { 415 vim_free(old_vms_fmatch); 416 return 0; 417 } 418 vms_match_free = EXPL_ALLOC_INC; 419 } 420 vms_fmatch[vms_match_num] = vim_strsave((char_u *)name); 421 422 ++vms_match_num; 423 return 1; 424 } 425 426 /* 427 * mch_expand_wildcards this code does wild-card pattern 428 * matching NOT using the shell 429 * 430 * return OK for success, FAIL for error (you may lose some 431 * memory) and put an error message in *file. 432 * 433 * num_pat number of input patterns 434 * pat array of pointers to input patterns 435 * num_file pointer to number of matched file names 436 * file pointer to array of pointers to matched file names 437 * 438 */ 439 int 440 mch_expand_wildcards(int num_pat, char_u **pat, int *num_file, char_u ***file, int flags) 441 { 442 int i, cnt = 0; 443 char_u buf[MAXPATHL]; 444 char *result; 445 int dir; 446 int files_alloced, files_free; 447 448 *num_file = 0; // default: no files found 449 files_alloced = EXPL_ALLOC_INC; 450 files_free = EXPL_ALLOC_INC; 451 *file = ALLOC_MULT(char_u *, files_alloced); 452 if (*file == NULL) 453 { 454 *num_file = 0; 455 return FAIL; 456 } 457 for (i = 0; i < num_pat; i++) 458 { 459 // expand environment var or home dir 460 if (vim_strchr(pat[i],'$') || vim_strchr(pat[i],'~')) 461 expand_env(pat[i],buf,MAXPATHL); 462 else 463 STRCPY(buf,pat[i]); 464 465 vms_match_num = 0; // reset collection counter 466 result = decc$translate_vms(vms_fixfilename(buf)); 467 if ( (int) result == 0 || (int) result == -1 ) { 468 cnt = 0; 469 } else { 470 cnt = decc$to_vms(result, vms_wproc, 1 /*allow wild*/ , (flags & EW_DIR ? 0:1 ) /*allow directory*/) ; 471 } 472 if (cnt > 0) 473 cnt = vms_match_num; 474 475 if (cnt < 1) 476 continue; 477 478 for (i = 0; i < cnt; i++) 479 { 480 // files should exist if expanding interactively 481 if (!(flags & EW_NOTFOUND) && mch_getperm(vms_fmatch[i]) < 0) 482 continue; 483 484 // do not include directories 485 dir = (mch_isdir(vms_fmatch[i])); 486 if (( dir && !(flags & EW_DIR)) || (!dir && !(flags & EW_FILE))) 487 continue; 488 489 // Skip files that are not executable if we check for that. 490 if (!dir && (flags & EW_EXEC) 491 && !mch_can_exe(vms_fmatch[i], NULL, !(flags & EW_SHELLCMD))) 492 continue; 493 494 // allocate memory for pointers 495 if (--files_free < 1) 496 { 497 char_u **old_file = *file; 498 499 files_alloced += EXPL_ALLOC_INC; 500 *file = vim_realloc(old_file, sizeof(char_u **) * files_alloced); 501 if (*file == NULL) 502 { 503 vim_free(old_file); 504 *file = (char_u **)""; 505 *num_file = 0; 506 return(FAIL); 507 } 508 files_free = EXPL_ALLOC_INC; 509 } 510 511 (*file)[*num_file++] = vms_fmatch[i]; 512 } 513 } 514 return OK; 515 } 516 517 int 518 mch_expandpath(garray_T *gap, char_u *path, int flags) 519 { 520 int i,cnt = 0; 521 char *result; 522 523 vms_match_num = 0; 524 // the result from the decc$translate_vms needs to be handled 525 // otherwise it might create ACCVIO error in decc$to_vms 526 result = decc$translate_vms(vms_fixfilename(path)); 527 if ( (int) result == 0 || (int) result == -1 ) { 528 cnt = 0; 529 } else { 530 cnt = decc$to_vms(result, vms_wproc, 1 /*allow_wild*/, (flags & EW_DIR ? 0:1 ) /*allow directory*/); 531 } 532 if (cnt > 0) 533 cnt = vms_match_num; 534 for (i = 0; i < cnt; i++) 535 { 536 if (mch_getperm(vms_fmatch[i]) >= 0) // add existing file 537 addfile(gap, vms_fmatch[i], flags); 538 } 539 return cnt; 540 } 541 542 /* 543 * attempt to translate a mixed unix-vms file specification to pure vms 544 */ 545 static void 546 vms_unix_mixed_filespec(char *in, char *out) 547 { 548 char *lastcolon; 549 char *end_of_dir; 550 char ch; 551 int len; 552 char *out_str=out; 553 554 // copy vms filename portion up to last colon 555 // (node and/or disk) 556 lastcolon = strrchr(in, ':'); // find last colon 557 if (lastcolon != NULL) { 558 len = lastcolon - in + 1; 559 strncpy(out, in, len); 560 out += len; 561 in += len; 562 } 563 564 end_of_dir = NULL; // default: no directory 565 566 // start of directory portion 567 ch = *in; 568 if ((ch == '[') || (ch == '/') || (ch == '<')) { // start of directory(s) ? 569 ch = '['; 570 SKIP_FOLLOWING_SLASHES(in); 571 } else if (EQN(in, "../", 3)) { // Unix parent directory? 572 *out++ = '['; 573 *out++ = '-'; 574 end_of_dir = out; 575 ch = '.'; 576 in += 2; 577 SKIP_FOLLOWING_SLASHES(in); 578 } else { // not a special character 579 while (EQN(in, "./", 2)) { // Ignore Unix "current dir" 580 in += 2; 581 SKIP_FOLLOWING_SLASHES(in); 582 } 583 if (strchr(in, '/') == NULL) { // any more Unix directories ? 584 strcpy(out, in); // No - get rest of the spec 585 return; 586 } else { 587 *out++ = '['; // Yes, denote a Vms subdirectory 588 ch = '.'; 589 --in; 590 } 591 } 592 593 // if we get here, there is a directory part of the filename 594 595 // initialize output file spec 596 *out++ = ch; 597 ++in; 598 599 while (*in != '\0') { 600 ch = *in; 601 if ((ch == ']') || (ch == '/') || (ch == '>') ) { // end of (sub)directory ? 602 end_of_dir = out; 603 ch = '.'; 604 SKIP_FOLLOWING_SLASHES(in); 605 } 606 else if (EQN(in, "../", 3)) { // Unix parent directory? 607 *out++ = '-'; 608 end_of_dir = out; 609 ch = '.'; 610 in += 2; 611 SKIP_FOLLOWING_SLASHES(in); 612 } 613 else { 614 while (EQN(in, "./", 2)) { // Ignore Unix "current dir" 615 end_of_dir = out; 616 in += 2; 617 SKIP_FOLLOWING_SLASHES(in); 618 ch = *in; 619 } 620 } 621 622 // Place next character into output file spec 623 *out++ = ch; 624 ++in; 625 } 626 627 *out = '\0'; // Terminate output file spec 628 629 if (end_of_dir != NULL) // Terminate directory portion 630 *end_of_dir = ']'; 631 } 632 633 /* 634 * for decc$to_vms in vms_fixfilename 635 */ 636 static int 637 vms_fspec_proc(char *fil, int val) 638 { 639 strcpy(Fspec_Rms,fil); 640 return(1); 641 } 642 643 /* 644 * change unix and mixed filenames to VMS 645 */ 646 void * 647 vms_fixfilename(void *instring) 648 { 649 static char *buf = NULL; 650 static size_t buflen = 0; 651 size_t len; 652 653 // get a big-enough buffer 654 len = strlen(instring) + 1; 655 if (len > buflen) 656 { 657 buflen = len + 128; 658 buf = vim_realloc(buf, buflen * sizeof(char)); 659 } 660 661 #ifdef DEBUG 662 char *tmpbuf = NULL; 663 tmpbuf = ALLOC_MULT(char, buflen); 664 strcpy(tmpbuf, instring); 665 #endif 666 667 Fspec_Rms = buf; // for decc$to_vms 668 669 if (strchr(instring,'/') == NULL) 670 // It is already a VMS file spec 671 strcpy(buf, instring); 672 else if (strchr(instring,'"') == NULL) // password in the path? 673 { 674 // Seems it is a regular file, let guess that it is pure Unix fspec 675 if (decc$to_vms(instring, vms_fspec_proc, 0, 0) <= 0) 676 // No... it must be mixed 677 vms_unix_mixed_filespec(instring, buf); 678 } 679 else 680 // we have a password in the path 681 // decc$ functions can not handle 682 // this is our only hope to resolv 683 vms_unix_mixed_filespec(instring, buf); 684 685 return buf; 686 } 687 688 /* 689 * Remove version number from file name 690 * we need it in some special cases as: 691 * creating swap file name and writing new file 692 */ 693 void 694 vms_remove_version(void * fname) 695 { 696 char_u *cp; 697 char_u *fp; 698 699 if ((cp = vim_strchr( fname, ';')) != NULL) // remove version 700 *cp = '\0'; 701 else if ((cp = vim_strrchr( fname, '.')) != NULL ) 702 { 703 if ((fp = vim_strrchr( fname, ']')) != NULL ) {;} 704 else if ((fp = vim_strrchr( fname, '>')) != NULL ) {;} 705 else fp = fname; 706 707 while ( *fp != '\0' && fp < cp ) 708 if ( *fp++ == '.' ) 709 *cp = '\0'; 710 } 711 return ; 712 } 713 714 struct typeahead_st { 715 unsigned short numchars; 716 unsigned char firstchar; 717 unsigned char reserved0; 718 unsigned long reserved1; 719 } typeahead; 720 721 /* 722 * Wait "msec" msec until a character is available from file descriptor "fd". 723 * "msec" == 0 will check for characters once. 724 * "msec" == -1 will block until a character is available. 725 */ 726 int 727 RealWaitForChar( 728 int fd UNUSED, // always read from iochan 729 long msec, 730 int *check_for_gpm UNUSED, 731 int *interrupted) 732 { 733 int status; 734 struct _generic_64 time_curr; 735 struct _generic_64 time_diff; 736 struct _generic_64 time_out; 737 unsigned int convert_operation = LIB$K_DELTA_SECONDS_F; 738 float sec =(float) msec/1000; 739 740 // make sure the iochan is set 741 if (!iochan) 742 get_tty(); 743 744 if (sec > 0) { 745 // time-out specified; convert it to absolute time 746 // sec>0 requirement of lib$cvtf_to_internal_time() 747 748 // get current time (number of 100ns ticks since the VMS Epoch) 749 status = sys$gettim(&time_curr); 750 if (status != SS$_NORMAL) 751 return 0; // error 752 // construct the delta time 753 #if __G_FLOAT==0 754 # ifndef VAX 755 // IEEE is default on IA64, but can be used on Alpha too - but not on VAX 756 status = lib$cvts_to_internal_time( 757 &convert_operation, &sec, &time_diff); 758 # endif 759 #else // default on Alpha and VAX 760 status = lib$cvtf_to_internal_time( 761 &convert_operation, &sec, &time_diff); 762 #endif 763 if (status != LIB$_NORMAL) 764 return 0; // error 765 // add them up 766 status = lib$add_times( 767 &time_curr, 768 &time_diff, 769 &time_out); 770 if (status != LIB$_NORMAL) 771 return 0; // error 772 } 773 774 while (TRUE) { 775 // select() 776 status = sys$qiow(0, iochan, IO$_SENSEMODE | IO$M_TYPEAHDCNT, iosb, 777 0, 0, &typeahead, 8, 0, 0, 0, 0); 778 if (status != SS$_NORMAL || (iosb[0] & 0xFFFF) != SS$_NORMAL) 779 return 0; // error 780 781 if (typeahead.numchars) 782 return 1; // ready to read 783 784 // there's nothing to read; what now? 785 if (msec == 0) { 786 // immediate time-out; return impatiently 787 return 0; 788 } else if (msec < 0) { 789 // no time-out; wait on indefinitely 790 return 1; // fakeout to force a wait in vms_read() 791 } else { 792 // time-out needs to be checked 793 status = sys$gettim(&time_curr); 794 if (status != SS$_NORMAL) 795 return 0; // error 796 797 status = lib$sub_times( 798 &time_out, 799 &time_curr, 800 &time_diff); 801 if (status != LIB$_NORMAL) 802 return 0; // error, incl. time_diff < 0 (i.e. time-out) 803 804 // otherwise wait some more 805 } 806 } 807 } 808