src/commands.c

   1 /* commands.c
   2  * Code for directives
   3  * Copyright (C) 1991-2003,2004,2005,2006,2010,2011,2012,2013,2014,2015,2016 Olly Betts
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  18  */
  19
  20 #ifdef HAVE_CONFIG_H
  21 #include <config.h>
  22 #endif
  23
  24 #include <assert.h>
  25 #include <limits.h>
  26 #include <stddef.h> /* for offsetof */
  27 #include <string.h>
  28
  29 #include <proj_api.h>
  30
  31 #include "cavern.h"
  32 #include "commands.h"
  33 #include "datain.h"
  34 #include "date.h"
  35 #include "debug.h"
  36 #include "filename.h"
  37 #include "message.h"
  38 #include "netbits.h"
  39 #include "netskel.h"
  40 #include "out.h"
  41 #include "readval.h"
  42 #include "str.h"
  43
  44 /*** Extracted from proj.4 projects (yuck, but grass also does this): */
  45 struct DERIVS {
  46     double x_l, x_p; /* derivatives of x for lambda-phi */
  47     double y_l, y_p; /* derivatives of y for lambda-phi */
  48 };
  49
  50 struct FACTORS {
  51     struct DERIVS der;
  52     double h, k;        /* meridinal, parallel scales */
  53     double omega, thetap;       /* angular distortion, theta prime */
  54     double conv;        /* convergence */
  55     double s;           /* areal scale factor */
  56     double a, b;        /* max-min scale error */
  57     int code;           /* info as to analytics, see following */
  58 };
  59
  60 int pj_factors(projLP, projPJ *, double, struct FACTORS *);
  61 /***/
  62
  63 static projPJ proj_wgs84;
  64
  65 static void
  66 default_grade(settings *s)
  67 {
  68    /* Values correspond to those in bcra5.svx */
  69    s->Var[Q_POS] = (real)sqrd(0.05);
  70    s->Var[Q_LENGTH] = (real)sqrd(0.05);
  71    s->Var[Q_BACKLENGTH] = (real)sqrd(0.05);
  72    s->Var[Q_COUNT] = (real)sqrd(0.05);
  73    s->Var[Q_DX] = s->Var[Q_DY] = s->Var[Q_DZ] = (real)sqrd(0.05);
  74    s->Var[Q_BEARING] = (real)sqrd(rad(0.5));
  75    s->Var[Q_GRADIENT] = (real)sqrd(rad(0.5));
  76    s->Var[Q_BACKBEARING] = (real)sqrd(rad(0.5));
  77    s->Var[Q_BACKGRADIENT] = (real)sqrd(rad(0.5));
  78    /* SD of plumbed legs (0.25 degrees?) */
  79    s->Var[Q_PLUMB] = (real)sqrd(rad(0.25));
  80    /* SD of level legs (0.25 degrees?) */
  81    s->Var[Q_LEVEL] = (real)sqrd(rad(0.25));
  82    s->Var[Q_DEPTH] = (real)sqrd(0.05);
  83 }
  84
  85 static void
  86 default_truncate(settings *s)
  87 {
  88    s->Truncate = INT_MAX;
  89 }
  90
  91 static void
  92 default_case(settings *s)
  93 {
  94    s->Case = LOWER;
  95 }
  96
  97 static reading default_order[] = { Fr, To, Tape, Comp, Clino, End };
  98
  99 static void
 100 default_style(settings *s)
 101 {
 102    s->style = STYLE_NORMAL;
 103    s->ordering = default_order;
 104    s->dash_for_anon_wall_station = fFalse;
 105 }
 106
 107 static void
 108 default_prefix(settings *s)
 109 {
 110    s->Prefix = root;
 111 }
 112
 113 static void
 114 default_translate(settings *s)
 115 {
 116    int i;
 117    short *t;
 118    if (s->next && s->next->Translate == s->Translate) {
 119       t = ((short*)osmalloc(ossizeof(short) * 257)) + 1;
 120       memcpy(t - 1, s->Translate - 1, sizeof(short) * 257);
 121       s->Translate = t;
 122    }
 123 /*  SVX_ASSERT(EOF==-1);*/ /* important, since we rely on this */
 124    t = s->Translate;
 125    memset(t - 1, 0, sizeof(short) * 257);
 126    for (i = '0'; i <= '9'; i++) t[i] = SPECIAL_NAMES;
 127    for (i = 'A'; i <= 'Z'; i++) t[i] = SPECIAL_NAMES;
 128    for (i = 'a'; i <= 'z'; i++) t[i] = SPECIAL_NAMES;
 129
 130    t['\t'] |= SPECIAL_BLANK;
 131    t[' '] |= SPECIAL_BLANK;
 132    t[','] |= SPECIAL_BLANK;
 133    t[';'] |= SPECIAL_COMMENT;
 134    t['\032'] |= SPECIAL_EOL; /* Ctrl-Z, so olde DOS text files are handled ok */
 135    t[EOF] |= SPECIAL_EOL;
 136    t['\n'] |= SPECIAL_EOL;
 137    t['\r'] |= SPECIAL_EOL;
 138    t['*'] |= SPECIAL_KEYWORD;
 139    t['-'] |= SPECIAL_OMIT;
 140    t['\\'] |= SPECIAL_ROOT;
 141    t['.'] |= SPECIAL_SEPARATOR;
 142    t['_'] |= SPECIAL_NAMES;
 143    t['-'] |= SPECIAL_NAMES; /* Added in 0.97 prerelease 4 */
 144    t['.'] |= SPECIAL_DECIMAL;
 145    t['-'] |= SPECIAL_MINUS;
 146    t['+'] |= SPECIAL_PLUS;
 147 #if 0 /* FIXME */
 148    t['{'] |= SPECIAL_OPEN;
 149    t['}'] |= SPECIAL_CLOSE;
 150 #endif
 151 }
 152
 153 void
 154 default_units(settings *s)
 155 {
 156    int quantity;
 157    for (quantity = 0; quantity < Q_MAC; quantity++) {
 158       if (TSTBIT(ANG_QMASK, quantity))
 159          s->units[quantity] = (real)(M_PI / 180.0); /* degrees */
 160       else
 161          s->units[quantity] = (real)1.0; /* metres */
 162    }
 163    s->f_clino_percent = s->f_backclino_percent = fFalse;
 164 }
 165
 166 void
 167 default_calib(settings *s)
 168 {
 169    int quantity;
 170    for (quantity = 0; quantity < Q_MAC; quantity++) {
 171       s->z[quantity] = (real)0.0;
 172       s->sc[quantity] = (real)1.0;
 173    }
 174 }
 175
 176 static void
 177 default_flags(settings *s)
 178 {
 179    s->flags = 0;
 180 }
 181
 182 extern void
 183 default_all(settings *s)
 184 {
 185    default_truncate(s);
 186    s->infer = 0;
 187    default_case(s);
 188    default_style(s);
 189    default_prefix(s);
 190    default_translate(s);
 191    default_grade(s);
 192    default_units(s);
 193    default_calib(s);
 194    default_flags(s);
 195 }
 196
 197 char *buffer = NULL;
 198 static int buf_len;
 199
 200 static char *ucbuffer = NULL;
 201
 202 /* read token */
 203 extern void
 204 get_token(void)
 205 {
 206    skipblanks();
 207    get_token_no_blanks();
 208 }
 209
 210 extern void
 211 get_token_no_blanks(void)
 212 {
 213    int i = -1;
 214
 215    s_zero(&buffer);
 216    osfree(ucbuffer);
 217    while (isalpha(ch)) {
 218       s_catchar(&buffer, &buf_len, (char)ch);
 219       nextch();
 220    }
 221
 222    if (!buffer) s_catchar(&buffer, &buf_len, '\0');
 223
 224    ucbuffer = osmalloc(buf_len);
 225    do {
 226       i++;
 227       ucbuffer[i] = toupper(buffer[i]);
 228    } while (buffer[i]);
 229 #if 0
 230    printf("get_token_no_blanks() got “%s”\n", buffer);
 231 #endif
 232 }
 233
 234 /* read word */
 235 static void
 236 get_word(void)
 237 {
 238    s_zero(&buffer);
 239    skipblanks();
 240    while (!isBlank(ch) && !isEol(ch)) {
 241       s_catchar(&buffer, &buf_len, (char)ch);
 242       nextch();
 243    }
 244
 245    if (!buffer) s_catchar(&buffer, &buf_len, '\0');
 246 #if 0
 247    printf("get_word() got “%s”\n", buffer);
 248 #endif
 249 }
 250
 251 /* match_tok() now uses binary chop
 252  * tab argument should be alphabetically sorted (ascending)
 253  */
 254 extern int
 255 match_tok(const sztok *tab, int tab_size)
 256 {
 257    int a = 0, b = tab_size - 1, c;
 258    int r;
 259    assert(tab_size > 0); /* catch empty table */
 260 /*  printf("[%d,%d]",a,b); */
 261    while (a <= b) {
 262       c = (unsigned)(a + b) / 2;
 263 /*     printf(" %d",c); */
 264       r = strcmp(tab[c].sz, ucbuffer);
 265       if (r == 0) return tab[c].tok; /* match */
 266       if (r < 0)
 267          a = c + 1;
 268       else
 269          b = c - 1;
 270    }
 271    return tab[tab_size].tok; /* no match */
 272 }
 273
 274 typedef enum {
 275    CMD_NULL = -1, CMD_ALIAS, CMD_BEGIN, CMD_CALIBRATE, CMD_CASE, CMD_COPYRIGHT,
 276    CMD_CS, CMD_DATA, CMD_DATE, CMD_DECLINATION, CMD_DEFAULT, CMD_END,
 277    CMD_ENTRANCE, CMD_EQUATE, CMD_EXPORT, CMD_FIX, CMD_FLAGS, CMD_INCLUDE,
 278    CMD_INFER, CMD_INSTRUMENT, CMD_PREFIX, CMD_REF, CMD_REQUIRE, CMD_SD,
 279    CMD_SET, CMD_SOLVE, CMD_TEAM, CMD_TITLE, CMD_TRUNCATE, CMD_UNITS
 280 } cmds;
 281
 282 static const sztok cmd_tab[] = {
 283      {"ALIAS",     CMD_ALIAS},
 284      {"BEGIN",     CMD_BEGIN},
 285      {"CALIBRATE", CMD_CALIBRATE},
 286      {"CASE",      CMD_CASE},
 287      {"COPYRIGHT", CMD_COPYRIGHT},
 288      {"CS",        CMD_CS},
 289      {"DATA",      CMD_DATA},
 290      {"DATE",      CMD_DATE},
 291      {"DECLINATION", CMD_DECLINATION},
 292 #ifndef NO_DEPRECATED
 293      {"DEFAULT",   CMD_DEFAULT},
 294 #endif
 295      {"END",       CMD_END},
 296      {"ENTRANCE",  CMD_ENTRANCE},
 297      {"EQUATE",    CMD_EQUATE},
 298      {"EXPORT",    CMD_EXPORT},
 299      {"FIX",       CMD_FIX},
 300      {"FLAGS",     CMD_FLAGS},
 301      {"INCLUDE",   CMD_INCLUDE},
 302      {"INFER",     CMD_INFER},
 303      {"INSTRUMENT",CMD_INSTRUMENT},
 304 #ifndef NO_DEPRECATED
 305      {"PREFIX",    CMD_PREFIX},
 306 #endif
 307      {"REF",       CMD_REF},
 308      {"REQUIRE",   CMD_REQUIRE},
 309      {"SD",        CMD_SD},
 310      {"SET",       CMD_SET},
 311      {"SOLVE",     CMD_SOLVE},
 312      {"TEAM",      CMD_TEAM},
 313      {"TITLE",     CMD_TITLE},
 314      {"TRUNCATE",  CMD_TRUNCATE},
 315      {"UNITS",     CMD_UNITS},
 316      {NULL,        CMD_NULL}
 317 };
 318
 319 /* masks for units which are length and angles respectively */
 320 #define LEN_UMASK (BIT(UNITS_METRES) | BIT(UNITS_FEET) | BIT(UNITS_YARDS))
 321 #define ANG_UMASK (BIT(UNITS_DEGS) | BIT(UNITS_GRADS) | BIT(UNITS_MINUTES))
 322
 323 /* ordering must be the same as the units enum */
 324 const real factor_tab[] = {
 325    1.0, METRES_PER_FOOT, (METRES_PER_FOOT*3.0),
 326    (M_PI/180.0), (M_PI/200.0), 0.01, (M_PI/180.0/60.0)
 327 };
 328
 329 const int units_to_msgno[] = {
 330     /*m*/424,
 331     /*ft*/428,
 332     -1, /* yards */
 333     /*°*/344,
 334     /*ᵍ*/76,
 335     /*%*/96,
 336     -1 /* minutes */
 337 };
 338
 339 int get_length_units(int quantity) {
 340     double factor = pcs->units[quantity];
 341     if (fabs(factor - METRES_PER_FOOT) <= REAL_EPSILON ||
 342         fabs(factor - METRES_PER_FOOT * 3.0) <= REAL_EPSILON) {
 343         return UNITS_FEET;
 344     }
 345     return UNITS_METRES;
 346 }
 347
 348 int get_angle_units(int quantity) {
 349     double factor = pcs->units[quantity];
 350     if (fabs(factor - M_PI / 200.0) <= REAL_EPSILON) {
 351         return UNITS_GRADS;
 352     }
 353     return UNITS_DEGS;
 354 }
 355
 356 static int
 357 get_units(unsigned long qmask, bool percent_ok)
 358 {
 359    static const sztok utab[] = {
 360         {"DEGREES",       UNITS_DEGS },
 361         {"DEGS",          UNITS_DEGS },
 362         {"FEET",          UNITS_FEET },
 363         {"GRADS",         UNITS_GRADS },
 364         {"METERS",        UNITS_METRES },
 365         {"METRES",        UNITS_METRES },
 366         {"METRIC",        UNITS_METRES },
 367         {"MILS",          UNITS_GRADS },
 368         {"MINUTES",       UNITS_MINUTES },
 369         {"PERCENT",       UNITS_PERCENT },
 370         {"PERCENTAGE",    UNITS_PERCENT },
 371         {"YARDS",         UNITS_YARDS },
 372         {NULL,            UNITS_NULL }
 373    };
 374    int units;
 375    get_token();
 376    units = match_tok(utab, TABSIZE(utab));
 377    if (units == UNITS_NULL) {
 378       compile_diagnostic(DIAG_ERR|DIAG_BUF|DIAG_SKIP, /*Unknown units “%s”*/35, buffer);
 379       return UNITS_NULL;
 380    }
 381    if (units == UNITS_PERCENT && percent_ok &&
 382        !(qmask & ~(BIT(Q_GRADIENT)|BIT(Q_BACKGRADIENT)))) {
 383       return units;
 384    }
 385    if (((qmask & LEN_QMASK) && !TSTBIT(LEN_UMASK, units)) ||
 386        ((qmask & ANG_QMASK) && !TSTBIT(ANG_UMASK, units))) {
 387       /* TRANSLATORS: Note: In English you talk about the *units* of a single
 388        * measurement, but the correct term in other languages may be singular.
 389        */
 390       compile_diagnostic(DIAG_ERR|DIAG_BUF|DIAG_SKIP, /*Invalid units “%s” for quantity*/37, buffer);
 391       return UNITS_NULL;
 392    }
 393    return units;
 394 }
 395
 396 /* returns mask with bit x set to indicate quantity x specified */
 397 static unsigned long
 398 get_qlist(unsigned long mask_bad)
 399 {
 400    static const sztok qtab[] = {
 401         {"ALTITUDE",     Q_DZ },
 402         {"BACKBEARING",  Q_BACKBEARING },
 403         {"BACKCLINO",    Q_BACKGRADIENT },    /* alternative name */
 404         {"BACKCOMPASS",  Q_BACKBEARING },     /* alternative name */
 405         {"BACKGRADIENT", Q_BACKGRADIENT },
 406         {"BACKLENGTH",   Q_BACKLENGTH },
 407         {"BACKTAPE",     Q_BACKLENGTH },    /* alternative name */
 408         {"BEARING",      Q_BEARING },
 409         {"CEILING",      Q_UP },          /* alternative name */
 410         {"CLINO",        Q_GRADIENT },    /* alternative name */
 411         {"COMPASS",      Q_BEARING },     /* alternative name */
 412         {"COUNT",        Q_COUNT },
 413         {"COUNTER",      Q_COUNT },       /* alternative name */
 414         {"DECLINATION",  Q_DECLINATION },
 415         {"DEFAULT",      Q_DEFAULT }, /* not a real quantity... */
 416         {"DEPTH",        Q_DEPTH },
 417         {"DOWN",         Q_DOWN },
 418         {"DX",           Q_DX },          /* alternative name */
 419         {"DY",           Q_DY },          /* alternative name */
 420         {"DZ",           Q_DZ },          /* alternative name */
 421         {"EASTING",      Q_DX },
 422         {"FLOOR",        Q_DOWN },        /* alternative name */
 423         {"GRADIENT",     Q_GRADIENT },
 424         {"LEFT",         Q_LEFT },
 425         {"LENGTH",       Q_LENGTH },
 426         {"LEVEL",        Q_LEVEL},
 427         {"NORTHING",     Q_DY },
 428         {"PLUMB",        Q_PLUMB},
 429         {"POSITION",     Q_POS },
 430         {"RIGHT",        Q_RIGHT },
 431         {"TAPE",         Q_LENGTH },      /* alternative name */
 432         {"UP",           Q_UP },
 433         {NULL,           Q_NULL }
 434    };
 435    unsigned long qmask = 0;
 436    int tok;
 437    filepos fp;
 438
 439    while (1) {
 440       get_pos(&fp);
 441       get_token();
 442       tok = match_tok(qtab, TABSIZE(qtab));
 443       if (tok == Q_DEFAULT && !(mask_bad & BIT(Q_DEFAULT))) {
 444           /* Only recognise DEFAULT if it is the first quantity, and then don't
 445            * look for any more. */
 446           if (qmask == 0)
 447               return BIT(Q_DEFAULT);
 448           break;
 449       }
 450       /* bail out if we reach the table end with no match */
 451       if (tok == Q_NULL) break;
 452       qmask |= BIT(tok);
 453       if (qmask & mask_bad) {
 454          compile_diagnostic(DIAG_ERR|DIAG_BUF|DIAG_SKIP, /*Unknown instrument “%s”*/39, buffer);
 455          return 0;
 456       }
 457    }
 458
 459    if (qmask == 0) {
 460       /* TRANSLATORS: A "quantity" is something measured like "LENGTH",
 461        * "BEARING", "ALTITUDE", etc. */
 462       compile_diagnostic(DIAG_ERR|DIAG_BUF|DIAG_SKIP, /*Unknown quantity “%s”*/34, buffer);
 463    } else {
 464       set_pos(&fp);
 465    }
 466
 467    return qmask;
 468 }
 469
 470 #define SPECIAL_UNKNOWN 0
 471 static void
 472 cmd_set(void)
 473 {
 474    static const sztok chartab[] = {
 475         {"BLANK",     SPECIAL_BLANK },
 476 /*FIXME {"CLOSE",     SPECIAL_CLOSE }, */
 477         {"COMMENT",   SPECIAL_COMMENT },
 478         {"DECIMAL",   SPECIAL_DECIMAL },
 479         {"EOL",       SPECIAL_EOL }, /* EOL won't work well */
 480         {"KEYWORD",   SPECIAL_KEYWORD },
 481         {"MINUS",     SPECIAL_MINUS },
 482         {"NAMES",     SPECIAL_NAMES },
 483         {"OMIT",      SPECIAL_OMIT },
 484 /*FIXME {"OPEN",      SPECIAL_OPEN }, */
 485         {"PLUS",      SPECIAL_PLUS },
 486 #ifndef NO_DEPRECATED
 487         {"ROOT",      SPECIAL_ROOT },
 488 #endif
 489         {"SEPARATOR", SPECIAL_SEPARATOR },
 490         {NULL,        SPECIAL_UNKNOWN }
 491    };
 492    int mask;
 493    int i;
 494
 495    get_token();
 496    mask = match_tok(chartab, TABSIZE(chartab));
 497
 498    if (mask == SPECIAL_UNKNOWN) {
 499       compile_diagnostic(DIAG_ERR|DIAG_BUF|DIAG_SKIP, /*Unknown character class “%s”*/42, buffer);
 500       return;
 501    }
 502
 503 #ifndef NO_DEPRECATED
 504    if (mask == SPECIAL_ROOT) {
 505       if (root_depr_count < 5) {
 506          /* TRANSLATORS: Use of the ROOT character (which is "\" by default) is
 507           * deprecated, so this error would be generated by:
 508           *
 509           * *equate \foo.7 1
 510           *
 511           * If you're unsure what "deprecated" means, see:
 512           * http://en.wikipedia.org/wiki/Deprecation */
 513          compile_diagnostic(DIAG_WARN|DIAG_BUF, /*ROOT is deprecated*/25);
 514          if (++root_depr_count == 5)
 515              /* TRANSLATORS: If you're unsure what "deprecated" means, see:
 516               * http://en.wikipedia.org/wiki/Deprecation */
 517             compile_diagnostic(DIAG_WARN, /*Further uses of this deprecated feature will not be reported*/95);
 518       }
 519    }
 520 #endif
 521
 522    /* if we're currently using an inherited translation table, allocate a new
 523     * table, and copy old one into it */
 524    if (pcs->next && pcs->next->Translate == pcs->Translate) {
 525       short *p;
 526       p = ((short*)osmalloc(ossizeof(short) * 257)) + 1;
 527       memcpy(p - 1, pcs->Translate - 1, sizeof(short) * 257);
 528       pcs->Translate = p;
 529    }
 530
 531    skipblanks();
 532
 533    /* clear this flag for all non-alphanums */
 534    for (i = 0; i < 256; i++)
 535       if (!isalnum(i)) pcs->Translate[i] &= ~mask;
 536
 537    /* now set this flag for all specified chars */
 538    while (!isEol(ch)) {
 539       if (!isalnum(ch)) {
 540          pcs->Translate[ch] |= mask;
 541       } else if (tolower(ch) == 'x') {
 542          int hex;
 543          filepos fp;
 544          get_pos(&fp);
 545          nextch();
 546          if (!isxdigit(ch)) {
 547             set_pos(&fp);
 548             break;
 549          }
 550          hex = isdigit(ch) ? ch - '0' : tolower(ch) - 'a';
 551          nextch();
 552          if (!isxdigit(ch)) {
 553             set_pos(&fp);
 554             break;
 555          }
 556          hex = hex << 4 | (isdigit(ch) ? ch - '0' : tolower(ch) - 'a');
 557          pcs->Translate[hex] |= mask;
 558       } else {
 559          break;
 560       }
 561       nextch();
 562    }
 563 }
 564
 565 static void
 566 check_reentry(prefix *survey, const filepos* fpos_ptr)
 567 {
 568    /* Don't try to check "*prefix \" or "*begin \" */
 569    if (!survey->up) return;
 570    if (TSTBIT(survey->sflags, SFLAGS_PREFIX_ENTERED)) {
 571       static int reenter_depr_count = 0;
 572       filepos fp_tmp;
 573
 574       if (reenter_depr_count >= 5)
 575          return;
 576
 577       get_pos(&fp_tmp);
 578       set_pos(fpos_ptr);
 579       /* TRANSLATORS: The first of two warnings given when a survey which has
 580        * already been completed is reentered.  This example file crawl.svx:
 581        *
 582        * *begin crawl     ; <- second warning here
 583        * 1 2 9.45 234 -01
 584        * *end crawl
 585        * *begin crawl     ; <- first warning here
 586        * 2 3 7.67 223 -03
 587        * *end crawl
 588        *
 589        * Would lead to:
 590        *
 591        * crawl.svx:4: Reentering an existing survey is deprecated
 592        * crawl.svx:1: Originally entered here
 593        *
 594        * If you're unsure what "deprecated" means, see:
 595        * http://en.wikipedia.org/wiki/Deprecation */
 596       compile_diagnostic(DIAG_WARN|DIAG_TOKEN, /*Reentering an existing survey is deprecated*/29);
 597       set_pos(&fp_tmp);
 598       /* TRANSLATORS: The second of two warnings given when a survey which has
 599        * already been completed is reentered.  This example file crawl.svx:
 600        *
 601        * *begin crawl
 602        * 1 2 9.45 234 -01 # <- second warning here
 603        * *end crawl
 604        * *begin crawl     # <- first warning here
 605        * 2 3 7.67 223 -03
 606        * *end crawl
 607        *
 608        * Would lead to:
 609        *
 610        * crawl.svx:3: Reentering an existing survey is deprecated
 611        * crawl.svx:1: Originally entered here
 612        *
 613        * If you're unsure what "deprecated" means, see:
 614        * http://en.wikipedia.org/wiki/Deprecation */
 615       compile_diagnostic_pfx(DIAG_WARN, survey, /*Originally entered here*/30);
 616       if (++reenter_depr_count == 5) {
 617          /* After we've warned about 5 uses of the same deprecated feature, we
 618           * give up for the rest of the current processing run.
 619           *
 620           * If you're unsure what "deprecated" means, see:
 621           * http://en.wikipedia.org/wiki/Deprecation */
 622          compile_diagnostic(DIAG_WARN, /*Further uses of this deprecated feature will not be reported*/95);
 623       }
 624    } else {
 625       survey->sflags |= BIT(SFLAGS_PREFIX_ENTERED);
 626       survey->filename = file.filename;
 627       survey->line = file.line;
 628    }
 629 }
 630
 631 #ifndef NO_DEPRECATED
 632 static void
 633 cmd_prefix(void)
 634 {
 635    static int prefix_depr_count = 0;
 636    prefix *survey;
 637    filepos fp;
 638    /* Issue warning first, so "*prefix \" warns first that *prefix is
 639     * deprecated and then that ROOT is...
 640     */
 641    if (prefix_depr_count < 5) {
 642       /* TRANSLATORS: If you're unsure what "deprecated" means, see:
 643        * http://en.wikipedia.org/wiki/Deprecation */
 644       compile_diagnostic(DIAG_WARN|DIAG_BUF, /**prefix is deprecated - use *begin and *end instead*/6);
 645       if (++prefix_depr_count == 5)
 646          compile_diagnostic(DIAG_WARN, /*Further uses of this deprecated feature will not be reported*/95);
 647    }
 648    get_pos(&fp);
 649    survey = read_prefix(PFX_SURVEY|PFX_ALLOW_ROOT);
 650    pcs->Prefix = survey;
 651    check_reentry(survey, &fp);
 652 }
 653 #endif
 654
 655 static void
 656 cmd_alias(void)
 657 {
 658    /* Currently only two forms are supported:
 659     * *alias station - ..
 660     * *alias station -
 661     */
 662    get_token();
 663    if (strcmp(ucbuffer, "STATION") != 0)
 664       goto bad;
 665    get_word();
 666    if (strcmp(buffer, "-") != 0)
 667       goto bad;
 668    get_word();
 669    if (*buffer && strcmp(buffer, "..") != 0)
 670       goto bad;
 671    pcs->dash_for_anon_wall_station = (*buffer != '\0');
 672    return;
 673 bad:
 674    compile_diagnostic(DIAG_ERR|DIAG_SKIP, /*Bad *alias command*/397);
 675 }
 676
 677 static void
 678 cmd_begin(void)
 679 {
 680    settings *pcsNew;
 681
 682    pcsNew = osnew(settings);
 683    *pcsNew = *pcs; /* copy contents */
 684    pcsNew->begin_lineno = file.line;
 685    pcsNew->next = pcs;
 686    pcs = pcsNew;
 687
 688    skipblanks();
 689    pcs->begin_survey = NULL;
 690    if (!isEol(ch) && !isComm(ch)) {
 691       filepos fp;
 692       prefix *survey;
 693       get_pos(&fp);
 694       survey = read_prefix(PFX_SURVEY|PFX_ALLOW_ROOT|PFX_WARN_SEPARATOR);
 695       pcs->begin_survey = survey;
 696       pcs->Prefix = survey;
 697       check_reentry(survey, &fp);
 698       f_export_ok = fTrue;
 699    }
 700 }
 701
 702 extern void
 703 free_settings(settings *p) {
 704    /* don't free default ordering or ordering used by parent */
 705    reading *order = p->ordering;
 706    if (order != default_order && (!p->next || order != p->next->ordering))
 707       osfree(order);
 708
 709    /* free Translate if not used by parent */
 710    if (!p->next || p->Translate != p->next->Translate)
 711       osfree(p->Translate - 1);
 712
 713    /* free meta if not used by parent, or in this block */
 714    if (p->meta && (!p->next || p->meta != p->next->meta) && p->meta->ref_count == 0)
 715        osfree(p->meta);
 716
 717    /* free proj if not used by parent, or as the output projection */
 718    if (p->proj && (!p->next || p->proj != p->next->proj) && p->proj != proj_out)
 719        pj_free(p->proj);
 720
 721    osfree(p);
 722 }
 723
 724 static void
 725 cmd_end(void)
 726 {
 727    settings *pcsParent;
 728    prefix *survey, *begin_survey;
 729    filepos fp;
 730
 731    pcsParent = pcs->next;
 732
 733    if (pcs->begin_lineno == 0) {
 734       if (pcsParent == NULL) {
 735          /* more ENDs than BEGINs */
 736          compile_diagnostic(DIAG_ERR|DIAG_SKIP, /*No matching BEGIN*/192);
 737       } else {
 738          compile_diagnostic(DIAG_ERR|DIAG_SKIP, /*END with no matching BEGIN in this file*/22);
 739       }
 740       return;
 741    }
 742
 743    begin_survey = pcs->begin_survey;
 744
 745    SVX_ASSERT(pcsParent);
 746    free_settings(pcs);
 747    pcs = pcsParent;
 748
 749    /* note need to read using root *before* BEGIN */
 750    skipblanks();
 751    if (isEol(ch) || isComm(ch)) {
 752       survey = NULL;
 753    } else {
 754       get_pos(&fp);
 755       survey = read_prefix(PFX_SURVEY|PFX_ALLOW_ROOT);
 756    }
 757
 758    if (survey != begin_survey) {
 759       if (survey) {
 760          set_pos(&fp);
 761          if (!begin_survey) {
 762             /* TRANSLATORS: Used when a BEGIN command has no survey, but the
 763              * END command does, e.g.:
 764              *
 765              * *begin
 766              * 1 2 10.00 178 -01
 767              * *end entrance      <--[Message given here] */
 768             compile_diagnostic(DIAG_ERR|DIAG_TOKEN, /*Matching BEGIN command has no survey name*/36);
 769          } else {
 770             /* TRANSLATORS: *BEGIN <survey> and *END <survey> should have the
 771              * same <survey> if it’s given at all */
 772             compile_diagnostic(DIAG_ERR|DIAG_TOKEN, /*Survey name doesn’t match BEGIN*/193);
 773          }
 774          skipline();
 775       } else {
 776          /* TRANSLATORS: Used when a BEGIN command has a survey name, but the
 777           * END command omits it, e.g.:
 778           *
 779           * *begin entrance
 780           * 1 2 10.00 178 -01
 781           * *end     <--[Message given here] */
 782          compile_diagnostic(DIAG_WARN|DIAG_COL, /*Survey name omitted from END*/194);
 783       }
 784    }
 785 }
 786
 787 static void
 788 cmd_entrance(void)
 789 {
 790    prefix *pfx = read_prefix(PFX_STATION);
 791    pfx->sflags |= BIT(SFLAGS_ENTRANCE);
 792 }
 793
 794 static const prefix * first_fix_name = NULL;
 795 static const char * first_fix_filename;
 796 static unsigned first_fix_line;
 797
 798 static void
 799 cmd_fix(void)
 800 {
 801    prefix *fix_name;
 802    node *stn = NULL;
 803    static prefix *name_omit_already = NULL;
 804    static const char * name_omit_already_filename = NULL;
 805    static unsigned int name_omit_already_line;
 806    real x, y, z;
 807    filepos fp;
 808
 809    fix_name = read_prefix(PFX_STATION|PFX_ALLOW_ROOT);
 810    fix_name->sflags |= BIT(SFLAGS_FIXED);
 811
 812    get_pos(&fp);
 813    get_token();
 814    if (strcmp(ucbuffer, "REFERENCE") == 0) {
 815       /* suppress "unused fixed point" warnings for this station */
 816       fix_name->sflags |= BIT(SFLAGS_USED);
 817    } else {
 818       if (*ucbuffer) set_pos(&fp);
 819    }
 820
 821    x = read_numeric(fTrue);
 822    if (x == HUGE_REAL) {
 823       /* If the end of the line isn't blank, read a number after all to
 824        * get a more helpful error message */
 825       if (!isEol(ch) && !isComm(ch)) x = read_numeric(fFalse);
 826    }
 827    if (x == HUGE_REAL) {
 828       if (pcs->proj || proj_out) {
 829          compile_diagnostic(DIAG_ERR|DIAG_SKIP, /*Coordinates can't be omitted when coordinate system has been specified*/439);
 830          return;
 831       }
 832
 833       if (fix_name == name_omit_already) {
 834          compile_diagnostic(DIAG_WARN, /*Same station fixed twice with no coordinates*/61);
 835          return;
 836       }
 837
 838       /* TRANSLATORS: " *fix a " gives this message: */
 839       compile_diagnostic(DIAG_WARN, /*FIX command with no coordinates - fixing at (0,0,0)*/54);
 840
 841       if (name_omit_already) {
 842          /* TRANSLATORS: Emitted after second and subsequent "FIX command with
 843           * no coordinates - fixing at (0,0,0)" warnings.
 844           */
 845          compile_diagnostic_at(DIAG_ERR,
 846                                name_omit_already_filename,
 847                                name_omit_already_line,
 848                                /*Already had FIX command with no coordinates for station “%s”*/441,
 849                                sprint_prefix(name_omit_already));
 850       } else {
 851          name_omit_already = fix_name;
 852          name_omit_already_filename = file.filename;
 853          name_omit_already_line = file.line;
 854       }
 855
 856       x = y = z = (real)0.0;
 857    } else {
 858       real sdx;
 859       y = read_numeric(fFalse);
 860       z = read_numeric(fFalse);
 861
 862       if (pcs->proj && proj_out) {
 863          if (pj_is_latlong(pcs->proj)) {
 864             /* PROJ expects lat and long in radians. */
 865             x = rad(x);
 866             y = rad(y);
 867          }
 868          int r = pj_transform(pcs->proj, proj_out, 1, 1, &x, &y, &z);
 869          if (r != 0) {
 870             compile_diagnostic(DIAG_ERR, /*Failed to convert coordinates: %s*/436, pj_strerrno(r));
 871          }
 872       } else if (pcs->proj) {
 873          compile_diagnostic(DIAG_ERR, /*The input projection is set but the output projection isn't*/437);
 874       } else if (proj_out) {
 875          compile_diagnostic(DIAG_ERR, /*The output projection is set but the input projection isn't*/438);
 876       }
 877
 878       get_pos(&fp);
 879       sdx = read_numeric(fTrue);
 880       if (sdx <= 0) {
 881           set_pos(&fp);
 882           compile_diagnostic(DIAG_ERR|DIAG_SKIP|DIAG_NUM, /*Standard deviation must be positive*/48);
 883           return;
 884       }
 885       if (sdx != HUGE_REAL) {
 886          real sdy, sdz;
 887          real cxy = 0, cyz = 0, czx = 0;
 888          get_pos(&fp);
 889          sdy = read_numeric(fTrue);
 890          if (sdy == HUGE_REAL) {
 891             /* only one variance given */
 892             sdy = sdz = sdx;
 893          } else {
 894             if (sdy <= 0) {
 895                set_pos(&fp);
 896                compile_diagnostic(DIAG_ERR|DIAG_SKIP|DIAG_NUM, /*Standard deviation must be positive*/48);
 897                return;
 898             }
 899             get_pos(&fp);
 900             sdz = read_numeric(fTrue);
 901             if (sdz == HUGE_REAL) {
 902                /* two variances given - horizontal & vertical */
 903                sdz = sdy;
 904                sdy = sdx;
 905             } else {
 906                if (sdz <= 0) {
 907                   set_pos(&fp);
 908                   compile_diagnostic(DIAG_ERR|DIAG_SKIP|DIAG_NUM, /*Standard deviation must be positive*/48);
 909                   return;
 910                }
 911                cxy = read_numeric(fTrue);
 912                if (cxy != HUGE_REAL) {
 913                   /* covariances given */
 914                   cyz = read_numeric(fFalse);
 915                   czx = read_numeric(fFalse);
 916                } else {
 917                   cxy = 0;
 918                }
 919             }
 920          }
 921          stn = StnFromPfx(fix_name);
 922          if (!fixed(stn)) {
 923             node *fixpt = osnew(node);
 924             prefix *name;
 925             name = osnew(prefix);
 926             name->pos = osnew(pos);
 927             name->ident = NULL;
 928             name->shape = 0;
 929             fixpt->name = name;
 930             name->stn = fixpt;
 931             name->up = NULL;
 932             if (TSTBIT(pcs->infer, INFER_EXPORTS)) {
 933                name->min_export = USHRT_MAX;
 934             } else {
 935                name->min_export = 0;
 936             }
 937             name->max_export = 0;
 938             name->sflags = 0;
 939             add_stn_to_list(&stnlist, fixpt);
 940             POS(fixpt, 0) = x;
 941             POS(fixpt, 1) = y;
 942             POS(fixpt, 2) = z;
 943             fix(fixpt);
 944             fixpt->leg[0] = fixpt->leg[1] = fixpt->leg[2] = NULL;
 945             addfakeleg(fixpt, stn, 0, 0, 0,
 946                        sdx * sdx, sdy * sdy, sdz * sdz
 947 #ifndef NO_COVARIANCES
 948                        , cxy, cyz, czx
 949 #endif
 950                        );
 951          }
 952
 953          if (!first_fix_name) {
 954             /* We track if we've fixed a station yet, and if so what the name
 955              * of the first fix was, so that we can issue an error if the
 956              * output coordinate system is set after fixing a station. */
 957             first_fix_name = fix_name;
 958             first_fix_filename = file.filename;
 959             first_fix_line = file.line;
 960          }
 961
 962          return;
 963       }
 964    }
 965
 966    if (!first_fix_name) {
 967       /* We track if we've fixed a station yet, and if so what the name of the
 968        * first fix was, so that we can issue an error if the output coordinate
 969        * system is set after fixing a station. */
 970       first_fix_name = fix_name;
 971       first_fix_filename = file.filename;
 972       first_fix_line = file.line;
 973    }
 974
 975    stn = StnFromPfx(fix_name);
 976    if (!fixed(stn)) {
 977       POS(stn, 0) = x;
 978       POS(stn, 1) = y;
 979       POS(stn, 2) = z;
 980       fix(stn);
 981       return;
 982    }
 983
 984    if (x != POS(stn, 0) || y != POS(stn, 1) || z != POS(stn, 2)) {
 985       compile_diagnostic(DIAG_ERR, /*Station already fixed or equated to a fixed point*/46);
 986       return;
 987    }
 988    /* TRANSLATORS: *fix a 1 2 3 / *fix a 1 2 3 */
 989    compile_diagnostic(DIAG_WARN, /*Station already fixed at the same coordinates*/55);
 990 }
 991
 992 static void
 993 cmd_flags(void)
 994 {
 995    static const sztok flagtab[] = {
 996         {"DUPLICATE", FLAGS_DUPLICATE },
 997         {"NOT",       FLAGS_NOT },
 998         {"SPLAY",     FLAGS_SPLAY },
 999         {"SURFACE",   FLAGS_SURFACE },
1000         {NULL,        FLAGS_UNKNOWN }
1001    };
1002    bool fNot = fFalse;
1003    bool fEmpty = fTrue;
1004    while (1) {
1005       int flag;
1006       get_token();
1007       /* If buffer is empty, it could mean end of line, or maybe
1008        * some non-letter junk which is better reported later */
1009       if (!buffer[0]) break;
1010
1011       fEmpty = fFalse;
1012       flag = match_tok(flagtab, TABSIZE(flagtab));
1013       /* treat the second NOT in "NOT NOT" as an unknown flag */
1014       if (flag == FLAGS_UNKNOWN || (fNot && flag == FLAGS_NOT)) {
1015          compile_diagnostic(DIAG_ERR|DIAG_BUF, /*FLAG “%s” unknown*/68, buffer);
1016          /* Recover from “*FLAGS NOT BOGUS SURFACE” by ignoring "NOT BOGUS" */
1017          fNot = fFalse;
1018       } else if (flag == FLAGS_NOT) {
1019          fNot = fTrue;
1020       } else if (fNot) {
1021          pcs->flags &= ~BIT(flag);
1022          fNot = fFalse;
1023       } else {
1024          pcs->flags |= BIT(flag);
1025       }
1026    }
1027
1028    if (fNot) {
1029       compile_diagnostic(DIAG_ERR|DIAG_BUF, /*Expecting “DUPLICATE”, “SPLAY”, or “SURFACE”*/188);
1030    } else if (fEmpty) {
1031       compile_diagnostic(DIAG_ERR|DIAG_BUF, /*Expecting “NOT”, “DUPLICATE”, “SPLAY”, or “SURFACE”*/189);
1032    }
1033 }
1034
1035 static void
1036 cmd_equate(void)
1037 {
1038    prefix *name1, *name2;
1039    bool fOnlyOneStn = fTrue; /* to trap eg *equate entrance.6 */
1040    filepos fp;
1041
1042    get_pos(&fp);
1043    name1 = read_prefix(PFX_STATION|PFX_ALLOW_ROOT|PFX_SUSPECT_TYPO);
1044    while (fTrue) {
1045       name2 = name1;
1046       skipblanks();
1047       if (isEol(ch) || isComm(ch)) {
1048          if (fOnlyOneStn) {
1049             set_pos(&fp);
1050             /* TRANSLATORS: EQUATE is a command name, so shouldn’t be
1051              * translated.
1052              *
1053              * Here "station" is a survey station, not a train station.
1054              */
1055             compile_diagnostic(DIAG_ERR|DIAG_SKIP|DIAG_TOKEN, /*Only one station in EQUATE command*/33);
1056          }
1057          return;
1058       }
1059
1060       name1 = read_prefix(PFX_STATION|PFX_ALLOW_ROOT|PFX_SUSPECT_TYPO);
1061       process_equate(name1, name2);
1062       fOnlyOneStn = fFalse;
1063    }
1064 }
1065
1066 static void
1067 report_missing_export(prefix *pfx, int depth)
1068 {
1069    char *s;
1070    const char *p;
1071    prefix *survey = pfx;
1072    int i;
1073    for (i = depth + 1; i; i--) {
1074       survey = survey->up;
1075       SVX_ASSERT(survey);
1076    }
1077    s = osstrdup(sprint_prefix(survey));
1078    p = sprint_prefix(pfx);
1079    if (survey->filename) {
1080       /* TRANSLATORS: A station must be exported out of each level it is in, so
1081        * this would give "Station “\outer.inner.1” not exported from survey
1082        * “\outer”)":
1083        *
1084        * *equate entrance outer.inner.1
1085        * *begin outer
1086        * *begin inner
1087        * *export 1
1088        * 1 2 1.23 045 -6
1089        * *end inner
1090        * *end outer
1091        *
1092        * Here "survey" is a "cave map" rather than list of questions - it should be
1093        * translated to the terminology that cavers using the language would use.
1094        */
1095       compile_diagnostic_pfx(DIAG_ERR, survey,
1096                              /*Station “%s” not exported from survey “%s”*/26, p, s);
1097    } else {
1098       compile_diagnostic(DIAG_ERR, /*Station “%s” not exported from survey “%s”*/26, p, s);
1099    }
1100    osfree(s);
1101 }
1102
1103 static void
1104 cmd_export(void)
1105 {
1106    prefix *pfx;
1107
1108    fExportUsed = fTrue;
1109    do {
1110       int depth = 0;
1111       pfx = read_prefix(PFX_STATION|PFX_NEW);
1112       if (pfx == NULL) {
1113          /* The argument was an existing station. */
1114          /* FIXME */
1115       } else {
1116          prefix *p = pfx;
1117          while (p != NULL && p != pcs->Prefix) {
1118             depth++;
1119             p = p->up;
1120          }
1121          /* Something like: *export \foo, but we've excluded use of root */
1122          SVX_ASSERT(p);
1123       }
1124       /* *export \ or similar bogus stuff */
1125       SVX_ASSERT(depth);
1126 #if 0
1127       printf("C min %d max %d depth %d pfx %s\n",
1128              pfx->min_export, pfx->max_export, depth, sprint_prefix(pfx));
1129 #endif
1130       if (pfx->min_export == 0) {
1131          /* not encountered *export for this name before */
1132          if (pfx->max_export > depth) report_missing_export(pfx, depth);
1133          pfx->min_export = pfx->max_export = depth;
1134       } else if (pfx->min_export != USHRT_MAX) {
1135          /* FIXME: what to do if a station is marked for inferred exports
1136           * but is then explicitly exported?  Currently we just ignore the
1137           * explicit export... */
1138          if (pfx->min_export - 1 > depth) {
1139             report_missing_export(pfx, depth);
1140          } else if (pfx->min_export - 1 < depth) {
1141             /* TRANSLATORS: Here "station" is a survey station, not a train station.
1142              *
1143              * Exporting a station twice gives this error:
1144              *
1145              * *begin example
1146              * *export 1
1147              * *export 1
1148              * 1 2 1.24 045 -6
1149              * *end example */
1150             compile_diagnostic(DIAG_ERR, /*Station “%s” already exported*/66,
1151                                sprint_prefix(pfx));
1152          }
1153          pfx->min_export = depth;
1154       }
1155       skipblanks();
1156    } while (!isEol(ch) && !isComm(ch));
1157 }
1158
1159 static void
1160 cmd_data(void)
1161 {
1162    static const sztok dtab[] = {
1163         {"ALTITUDE",     Dz },
1164         {"BACKBEARING",  BackComp },
1165         {"BACKCLINO",    BackClino }, /* alternative name */
1166         {"BACKCOMPASS",  BackComp }, /* alternative name */
1167         {"BACKGRADIENT", BackClino },
1168         {"BACKLENGTH",   BackTape },
1169         {"BACKTAPE",     BackTape }, /* alternative name */
1170         {"BEARING",      Comp },
1171         {"CEILING",      Up }, /* alternative name */
1172         {"CLINO",        Clino }, /* alternative name */
1173         {"COMPASS",      Comp }, /* alternative name */
1174         {"COUNT",        Count }, /* FrCount&ToCount in multiline */
1175         {"DEPTH",        Depth }, /* FrDepth&ToDepth in multiline */
1176         {"DEPTHCHANGE",  DepthChange },
1177         {"DIRECTION",    Dir },
1178         {"DOWN",         Down },
1179         {"DX",           Dx },
1180         {"DY",           Dy },
1181         {"DZ",           Dz },
1182         {"EASTING",      Dx },
1183         {"FLOOR",        Down }, /* alternative name */
1184         {"FROM",         Fr },
1185         {"FROMCOUNT",    FrCount },
1186         {"FROMDEPTH",    FrDepth },
1187         {"GRADIENT",     Clino },
1188         {"IGNORE",       Ignore },
1189         {"IGNOREALL",    IgnoreAll },
1190         {"LEFT",         Left },
1191         {"LENGTH",       Tape },
1192         {"NEWLINE",      Newline },
1193         {"NORTHING",     Dy },
1194         {"RIGHT",        Right },
1195         {"STATION",      Station }, /* Fr&To in multiline */
1196         {"TAPE",         Tape }, /* alternative name */
1197         {"TO",           To },
1198         {"TOCOUNT",      ToCount },
1199         {"TODEPTH",      ToDepth },
1200         {"UP",           Up },
1201         {NULL,           End }
1202    };
1203
1204 #define MASK_stns BIT(Fr) | BIT(To) | BIT(Station)
1205 #define MASK_tape BIT(Tape) | BIT(BackTape) | BIT(FrCount) | BIT(ToCount) | BIT(Count)
1206 #define MASK_dpth BIT(FrDepth) | BIT(ToDepth) | BIT(Depth) | BIT(DepthChange)
1207 #define MASK_comp BIT(Comp) | BIT(BackComp)
1208 #define MASK_clin BIT(Clino) | BIT(BackClino)
1209
1210 #define MASK_NORMAL MASK_stns | BIT(Dir) | MASK_tape | MASK_comp | MASK_clin
1211 #define MASK_DIVING MASK_NORMAL | MASK_dpth
1212 #define MASK_CARTESIAN MASK_stns | BIT(Dx) | BIT(Dy) | BIT(Dz)
1213 #define MASK_CYLPOLAR  MASK_stns | BIT(Dir) | MASK_tape | MASK_comp | MASK_dpth
1214 #define MASK_NOSURVEY MASK_stns
1215 #define MASK_PASSAGE BIT(Station) | BIT(Left) | BIT(Right) | BIT(Up) | BIT(Down)
1216
1217    /* readings which may be given for each style */
1218    static const unsigned long mask[] = {
1219       MASK_NORMAL, MASK_DIVING, MASK_CARTESIAN, MASK_CYLPOLAR, MASK_NOSURVEY,
1220       MASK_PASSAGE
1221    };
1222
1223    /* readings which may be omitted for each style */
1224    static const unsigned long mask_optional[] = {
1225       BIT(Dir) | BIT(Clino) | BIT(BackClino),
1226       BIT(Dir) | BIT(Clino) | BIT(BackClino),
1227       0,
1228       BIT(Dir),
1229       0,
1230       0 /* BIT(Left) | BIT(Right) | BIT(Up) | BIT(Down), */
1231    };
1232
1233    /* all valid readings */
1234    static const unsigned long mask_all[] = {
1235       MASK_NORMAL | BIT(Newline) | BIT(Ignore) | BIT(IgnoreAll) | BIT(End),
1236       MASK_DIVING | BIT(Newline) | BIT(Ignore) | BIT(IgnoreAll) | BIT(End),
1237       MASK_CARTESIAN | BIT(Newline) | BIT(Ignore) | BIT(IgnoreAll) | BIT(End),
1238       MASK_CYLPOLAR | BIT(Newline) | BIT(Ignore) | BIT(IgnoreAll) | BIT(End),
1239       MASK_NOSURVEY | BIT(Ignore) | BIT(IgnoreAll) | BIT(End),
1240       MASK_PASSAGE | BIT(Ignore) | BIT(IgnoreAll) | BIT(End)
1241    };
1242 #define STYLE_DEFAULT   -2
1243 #define STYLE_UNKNOWN   -1
1244
1245    static const sztok styletab[] = {
1246         {"CARTESIAN",    STYLE_CARTESIAN },
1247         {"CYLPOLAR",     STYLE_CYLPOLAR },
1248         {"DEFAULT",      STYLE_DEFAULT },
1249         {"DIVING",       STYLE_DIVING },
1250         {"NORMAL",       STYLE_NORMAL },
1251         {"NOSURVEY",     STYLE_NOSURVEY },
1252         {"PASSAGE",      STYLE_PASSAGE },
1253         {"TOPOFIL",      STYLE_NORMAL },
1254         {NULL,           STYLE_UNKNOWN }
1255    };
1256
1257 #define m_multi (BIT(Station) | BIT(Count) | BIT(Depth))
1258
1259    int style, k = 0, kMac;
1260    reading *new_order, d;
1261    unsigned long mUsed = 0;
1262    char *style_name;
1263
1264    /* after a bad *data command ignore survey data until the next
1265     * *data command to avoid an avalanche of errors */
1266    pcs->style = STYLE_IGNORE;
1267
1268    kMac = 6; /* minimum for NORMAL style */
1269    new_order = osmalloc(kMac * sizeof(reading));
1270
1271    get_token();
1272    style = match_tok(styletab, TABSIZE(styletab));
1273
1274    if (style == STYLE_DEFAULT) {
1275       default_style(pcs);
1276       return;
1277    }
1278
1279    if (style == STYLE_UNKNOWN) {
1280       /* TRANSLATORS: e.g. trying to refer to an invalid FNORD data style */
1281       compile_diagnostic(DIAG_ERR|DIAG_BUF|DIAG_SKIP, /*Data style “%s” unknown*/65, buffer);
1282       return;
1283    }
1284
1285    skipblanks();
1286 #ifndef NO_DEPRECATED
1287    /* Olde syntax had optional field for survey grade, so allow an omit
1288     * but issue a warning about it */
1289    if (isOmit(ch)) {
1290       static int data_depr_count = 0;
1291       if (data_depr_count < 5) {
1292          compile_diagnostic(DIAG_WARN|DIAG_BUF, /*“*data %s %c …” is deprecated - use “*data %s …” instead*/104,
1293                             buffer, ch, buffer);
1294          if (++data_depr_count == 5)
1295             compile_diagnostic(DIAG_WARN, /*Further uses of this deprecated feature will not be reported*/95);
1296       }
1297       nextch();
1298    }
1299 #endif
1300
1301    style_name = osstrdup(buffer);
1302    do {
1303       filepos fp;
1304       get_pos(&fp);
1305       get_token();
1306       d = match_tok(dtab, TABSIZE(dtab));
1307       /* only token allowed after IGNOREALL is NEWLINE */
1308       if (k && new_order[k - 1] == IgnoreAll && d != Newline) {
1309          set_pos(&fp);
1310          break;
1311       }
1312       /* Note: an unknown token is reported as trailing garbage */
1313       if (!TSTBIT(mask_all[style], d)) {
1314          /* TRANSLATORS: a data "style" is something like NORMAL, DIVING, etc.
1315           * a "reading" is one of FROM, TO, TAPE, COMPASS, CLINO for NORMAL
1316           * neither style nor reading is a keyword in the program This error
1317           * complains about a depth gauge reading in normal style, for example
1318           */
1319          compile_diagnostic(DIAG_ERR|DIAG_BUF|DIAG_SKIP,
1320                             /*Reading “%s” not allowed in data style “%s”*/63,
1321                             buffer, style_name);
1322          osfree(style_name);
1323          osfree(new_order);
1324          return;
1325       }
1326       if (TSTBIT(mUsed, Newline) && TSTBIT(m_multi, d)) {
1327          /* TRANSLATORS: caused by e.g.
1328           *
1329           * *data diving station newline depth tape compass
1330           *
1331           * ("depth" needs to occur before "newline"). */
1332          compile_diagnostic(DIAG_ERR|DIAG_BUF|DIAG_SKIP,
1333                             /*Reading “%s” must occur before NEWLINE*/225, buffer);
1334          osfree(style_name);
1335          osfree(new_order);
1336          return;
1337       }
1338       /* Check for duplicates unless it's a special reading:
1339        *   IGNOREALL,IGNORE (duplicates allowed) ; END (not possible)
1340        */
1341       if (!((BIT(Ignore) | BIT(End) | BIT(IgnoreAll)) & BIT(d))) {
1342          if (TSTBIT(mUsed, d)) {
1343             /* TRANSLATORS: complains about a situation like trying to define
1344              * two from stations per leg */
1345             compile_diagnostic(DIAG_ERR|DIAG_BUF|DIAG_SKIP, /*Duplicate reading “%s”*/67, buffer);
1346             osfree(style_name);
1347             osfree(new_order);
1348             return;
1349          } else {
1350             /* Check for previously listed readings which are incompatible
1351              * with this one - e.g. Count vs FrCount */
1352             bool fBad = fFalse;
1353             switch (d) {
1354              case Station:
1355                if (mUsed & (BIT(Fr) | BIT(To))) fBad = fTrue;
1356                break;
1357              case Fr: case To:
1358                if (TSTBIT(mUsed, Station)) fBad = fTrue;
1359                break;
1360              case Count:
1361                if (mUsed & (BIT(FrCount) | BIT(ToCount) | BIT(Tape)))
1362                   fBad = fTrue;
1363                break;
1364              case FrCount: case ToCount:
1365                if (mUsed & (BIT(Count) | BIT(Tape)))
1366                   fBad = fTrue;
1367                break;
1368              case Depth:
1369                if (mUsed & (BIT(FrDepth) | BIT(ToDepth) | BIT(DepthChange)))
1370                   fBad = fTrue;
1371                break;
1372              case FrDepth: case ToDepth:
1373                if (mUsed & (BIT(Depth) | BIT(DepthChange))) fBad = fTrue;
1374                break;
1375              case DepthChange:
1376                if (mUsed & (BIT(FrDepth) | BIT(ToDepth) | BIT(Depth)))
1377                   fBad = fTrue;
1378                break;
1379              case Newline:
1380                if (mUsed & ~m_multi) {
1381                   /* TRANSLATORS: e.g.
1382                    *
1383                    * *data normal from to tape newline compass clino */
1384                   compile_diagnostic(DIAG_ERR|DIAG_BUF|DIAG_SKIP, /*NEWLINE can only be preceded by STATION, DEPTH, and COUNT*/226);
1385                   osfree(style_name);
1386                   osfree(new_order);
1387                   return;
1388                }
1389                if (k == 0) {
1390                   /* TRANSLATORS: error from:
1391                    *
1392                    * *data normal newline from to tape compass clino */
1393                   compile_diagnostic(DIAG_ERR|DIAG_BUF|DIAG_SKIP, /*NEWLINE can’t be the first reading*/222);
1394                   osfree(style_name);
1395                   osfree(new_order);
1396                   return;
1397                }
1398                break;
1399              default: /* avoid compiler warnings about unhandled enums */
1400                break;
1401             }
1402             if (fBad) {
1403                /* Not entirely happy with phrasing this... */
1404                /* TRANSLATORS: This is an error from the *DATA command.  It
1405                 * means that a reading (which will appear where %s is isn't
1406                 * valid as the list of readings has already included the same
1407                 * reading, or an equivalent one (e.g. you can't have both
1408                 * DEPTH and DEPTHCHANGE together). */
1409                compile_diagnostic(DIAG_ERR|DIAG_BUF|DIAG_SKIP, /*Reading “%s” duplicates previous reading(s)*/77,
1410                                          buffer);
1411                osfree(style_name);
1412                osfree(new_order);
1413                return;
1414             }
1415             mUsed |= BIT(d); /* used to catch duplicates */
1416          }
1417       }
1418       if (k && new_order[k - 1] == IgnoreAll) {
1419          SVX_ASSERT(d == Newline);
1420          k--;
1421          d = IgnoreAllAndNewLine;
1422       }
1423       if (k >= kMac) {
1424          kMac = kMac * 2;
1425          new_order = osrealloc(new_order, kMac * sizeof(reading));
1426       }
1427       new_order[k++] = d;
1428    } while (d != End);
1429
1430    if (k >= 2 && new_order[k - 2] == Newline) {
1431       /* TRANSLATORS: error from:
1432        *
1433        * *data normal from to tape compass clino newline */
1434       compile_diagnostic(DIAG_ERR|DIAG_BUF|DIAG_SKIP, /*NEWLINE can’t be the last reading*/223);
1435       osfree(style_name);
1436       osfree(new_order);
1437       return;
1438    }
1439
1440    if (style == STYLE_NOSURVEY) {
1441       if (TSTBIT(mUsed, Station)) {
1442          if (k >= kMac) {
1443             kMac = kMac * 2;
1444             new_order = osrealloc(new_order, kMac * sizeof(reading));
1445          }
1446          new_order[k - 1] = Newline;
1447          new_order[k++] = End;
1448       }
1449    } else if (style == STYLE_PASSAGE) {
1450       /* Station doesn't mean "multiline" for STYLE_PASSAGE. */
1451    } else if (!TSTBIT(mUsed, Newline) && (m_multi & mUsed)) {
1452       /* TRANSLATORS: Error given by something like:
1453        *
1454        * *data normal station tape compass clino
1455        *
1456        * ("station" signifies interleaved data). */
1457       compile_diagnostic(DIAG_ERR|DIAG_SKIP, /*Interleaved readings, but no NEWLINE*/224);
1458       osfree(style_name);
1459       osfree(new_order);
1460       return;
1461    }
1462
1463 #if 0
1464    printf("mUsed = 0x%x\n", mUsed);
1465 #endif
1466
1467    /* Check the supplied readings form a sufficient set. */
1468    if (style != STYLE_PASSAGE) {
1469        if ((mUsed & (BIT(Fr) | BIT(To))) == (BIT(Fr) | BIT(To)))
1470            mUsed |= BIT(Station);
1471        else if (TSTBIT(mUsed, Station))
1472            mUsed |= BIT(Fr) | BIT(To);
1473    }
1474
1475    if (mUsed & (BIT(Comp) | BIT(BackComp)))
1476       mUsed |= BIT(Comp) | BIT(BackComp);
1477
1478    if (mUsed & (BIT(Clino) | BIT(BackClino)))
1479       mUsed |= BIT(Clino) | BIT(BackClino);
1480
1481    if ((mUsed & (BIT(FrDepth) | BIT(ToDepth))) == (BIT(FrDepth) | BIT(ToDepth)))
1482       mUsed |= BIT(Depth) | BIT(DepthChange);
1483    else if (mUsed & (BIT(Depth) | BIT(DepthChange)))
1484       mUsed |= BIT(FrDepth) | BIT(ToDepth) | BIT(Depth) | BIT(DepthChange);
1485
1486    if ((mUsed & (BIT(FrCount) | BIT(ToCount))) == (BIT(FrCount) | BIT(ToCount)))
1487       mUsed |= BIT(Count) | BIT(Tape) | BIT(BackTape);
1488    else if (mUsed & (BIT(Count) | BIT(Tape) | BIT(BackTape)))
1489       mUsed |= BIT(FrCount) | BIT(ToCount) | BIT(Count) | BIT(Tape) | BIT(BackTape);
1490
1491 #if 0
1492    printf("mUsed = 0x%x, opt = 0x%x, mask = 0x%x\n", mUsed,
1493           mask_optional[style], mask[style]);
1494 #endif
1495
1496    if (((mUsed &~ BIT(Newline)) | mask_optional[style]) != mask[style]) {
1497       /* Test should only fail with too few bits set, not too many */
1498       SVX_ASSERT((((mUsed &~ BIT(Newline)) | mask_optional[style])
1499               &~ mask[style]) == 0);
1500       /* TRANSLATORS: i.e. not enough readings for the style. */
1501       compile_diagnostic(DIAG_ERR|DIAG_SKIP, /*Too few readings for data style “%s”*/64, style_name);
1502       osfree(style_name);
1503       osfree(new_order);
1504       return;
1505    }
1506
1507    /* don't free default ordering or ordering used by parent */
1508    if (pcs->ordering != default_order &&
1509        !(pcs->next && pcs->next->ordering == pcs->ordering))
1510       osfree(pcs->ordering);
1511
1512    pcs->style = style;
1513    pcs->ordering = new_order;
1514
1515    osfree(style_name);
1516
1517    if (style == STYLE_PASSAGE) {
1518       lrudlist * new_psg = osnew(lrudlist);
1519       new_psg->tube = NULL;
1520       new_psg->next = model;
1521       model = new_psg;
1522       next_lrud = &(new_psg->tube);
1523    }
1524 }
1525
1526 static void
1527 cmd_units(void)
1528 {
1529    int units, quantity;
1530    unsigned long qmask;
1531    unsigned long m; /* mask with bit x set to indicate quantity x specified */
1532    real factor;
1533    filepos fp;
1534
1535    qmask = get_qlist(BIT(Q_POS)|BIT(Q_PLUMB)|BIT(Q_LEVEL));
1536
1537    if (!qmask) return;
1538    if (qmask == BIT(Q_DEFAULT)) {
1539       default_units(pcs);
1540       return;
1541    }
1542
1543    get_pos(&fp);
1544    factor = read_numeric(fTrue);
1545    if (factor == 0.0) {
1546       set_pos(&fp);
1547       /* TRANSLATORS: error message given by "*units tape 0 feet" - it’s
1548        * meaningless to say your tape is marked in "0 feet" (but you might
1549        * measure distance by counting knots on a diving line, and tie them
1550        * every "2 feet"). */
1551       compile_diagnostic(DIAG_ERR|DIAG_TOKEN, /**UNITS factor must be non-zero*/200);
1552       skipline();
1553       return;
1554    }
1555
1556    units = get_units(qmask, fTrue);
1557    if (units == UNITS_NULL) return;
1558    if (TSTBIT(qmask, Q_GRADIENT))
1559       pcs->f_clino_percent = (units == UNITS_PERCENT);
1560    if (TSTBIT(qmask, Q_BACKGRADIENT))
1561       pcs->f_backclino_percent = (units == UNITS_PERCENT);
1562
1563    if (factor == HUGE_REAL) {
1564       factor = factor_tab[units];
1565    } else {
1566       factor *= factor_tab[units];
1567    }
1568
1569    for (quantity = 0, m = BIT(quantity); m <= qmask; quantity++, m <<= 1)
1570       if (qmask & m) pcs->units[quantity] = factor;
1571 }
1572
1573 static void
1574 cmd_calibrate(void)
1575 {
1576    real sc, z;
1577    unsigned long qmask, m;
1578    int quantity;
1579    filepos fp;
1580
1581    qmask = get_qlist(BIT(Q_POS)|BIT(Q_PLUMB)|BIT(Q_LEVEL));
1582    if (!qmask) return; /* error already reported */
1583
1584    if (qmask == BIT(Q_DEFAULT)) {
1585       default_calib(pcs);
1586       return;
1587    }
1588
1589    if (((qmask & LEN_QMASK)) && ((qmask & ANG_QMASK))) {
1590       /* TRANSLATORS: e.g.
1591        *
1592        * *calibrate tape compass 1 1
1593        */
1594       compile_diagnostic(DIAG_ERR|DIAG_SKIP, /*Can’t calibrate angular and length quantities together*/227);
1595       return;
1596    }
1597
1598    z = read_numeric(fFalse);
1599    get_pos(&fp);
1600    sc = read_numeric(fTrue);
1601    if (sc == HUGE_REAL) {
1602       if (isalpha(ch)) {
1603          int units = get_units(qmask, fFalse);
1604          if (units == UNITS_NULL) {
1605             return;
1606          }
1607          z *= factor_tab[units];
1608          sc = read_numeric(fTrue);
1609          if (sc == HUGE_REAL) {
1610             sc = (real)1.0;
1611          } else {
1612             /* Adjustment applied is: (reading - z) * sc
1613              * We want: reading * sc - z
1614              * So divide z by sc so the applied adjustment does what we want.
1615              */
1616             z /= sc;
1617          }
1618       } else {
1619          sc = (real)1.0;
1620       }
1621    }
1622
1623    if (sc == HUGE_REAL) sc = (real)1.0;
1624    /* check for declination scale */
1625    if (TSTBIT(qmask, Q_DECLINATION) && sc != 1.0) {
1626       set_pos(&fp);
1627       /* TRANSLATORS: DECLINATION is a built-in keyword, so best not to
1628        * translate */
1629       compile_diagnostic(DIAG_ERR|DIAG_TOKEN, /*Scale factor must be 1.0 for DECLINATION*/40);
1630       skipline();
1631       return;
1632    }
1633    if (sc == 0.0) {
1634       set_pos(&fp);
1635       /* TRANSLATORS: If the scale factor for an instrument is zero, then any
1636        * reading would be mapped to zero, which doesn't make sense. */
1637       compile_diagnostic(DIAG_ERR|DIAG_TOKEN, /*Scale factor must be non-zero*/391);
1638       skipline();
1639       return;
1640    }
1641    for (quantity = 0, m = BIT(quantity); m <= qmask; quantity++, m <<= 1) {
1642       if (qmask & m) {
1643          pcs->z[quantity] = pcs->units[quantity] * z;
1644          pcs->sc[quantity] = sc;
1645       }
1646    }
1647 }
1648
1649 static void
1650 cmd_declination(void)
1651 {
1652     real v = read_numeric(fTrue);
1653     if (v == HUGE_REAL) {
1654         get_token_no_blanks();
1655         if (strcmp(ucbuffer, "AUTO") != 0) {
1656             compile_diagnostic(DIAG_ERR|DIAG_SKIP|DIAG_COL, /*Expected number or 'AUTO'*/309);
1657             return;
1658         }
1659         /* *declination auto X Y Z */
1660         real x = read_numeric(fFalse);
1661         real y = read_numeric(fFalse);
1662         real z = read_numeric(fFalse);
1663         if (!pcs->proj) {
1664             compile_diagnostic(DIAG_ERR, /*Input coordinate system must be specified for '*DECLINATION AUTO'*/301);
1665             return;
1666         }
1667         if (!proj_wgs84) {
1668             proj_wgs84 = pj_init_plus("+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs");
1669         }
1670         /* Convert to WGS84 lat long. */
1671         if (pj_is_latlong(pcs->proj)) {
1672             /* PROJ expects lat and long in radians. */
1673             x = rad(x);
1674             y = rad(y);
1675         }
1676         int r = pj_transform(pcs->proj, proj_wgs84, 1, 1, &x, &y, &z);
1677         if (r != 0) {
1678             compile_diagnostic(DIAG_ERR, /*Failed to convert coordinates: %s*/436, pj_strerrno(r));
1679             return;
1680         }
1681         pcs->z[Q_DECLINATION] = HUGE_REAL;
1682         pcs->dec_x = x;
1683         pcs->dec_y = y;
1684         pcs->dec_z = z;
1685         /* Invalidate cached declination. */
1686         pcs->declination = HUGE_REAL;
1687         {
1688             projLP lp = { x, y };
1689             struct FACTORS factors;
1690             memset(&factors, 0, sizeof(factors));
1691             pj_factors(lp, proj_out, 0.0, &factors);
1692             pcs->convergence = factors.conv;
1693         }
1694     } else {
1695         /* *declination D UNITS */
1696         int units = get_units(BIT(Q_DECLINATION), fFalse);
1697         if (units == UNITS_NULL) {
1698             return;
1699         }
1700         pcs->z[Q_DECLINATION] = -v * factor_tab[units];
1701         pcs->convergence = 0;
1702     }
1703 }
1704
1705 #ifndef NO_DEPRECATED
1706 static void
1707 cmd_default(void)
1708 {
1709    static const sztok defaulttab[] = {
1710       { "CALIBRATE", CMD_CALIBRATE },
1711       { "DATA",      CMD_DATA },
1712       { "UNITS",     CMD_UNITS },
1713       { NULL,        CMD_NULL }
1714    };
1715    static int default_depr_count = 0;
1716
1717    if (default_depr_count < 5) {
1718       /* TRANSLATORS: If you're unsure what "deprecated" means, see:
1719        * http://en.wikipedia.org/wiki/Deprecation */
1720       compile_diagnostic(DIAG_WARN|DIAG_COL, /**DEFAULT is deprecated - use *CALIBRATE/DATA/SD/UNITS with argument DEFAULT instead*/20);
1721       if (++default_depr_count == 5)
1722          compile_diagnostic(DIAG_WARN, /*Further uses of this deprecated feature will not be reported*/95);
1723    }
1724
1725    get_token();
1726    switch (match_tok(defaulttab, TABSIZE(defaulttab))) {
1727     case CMD_CALIBRATE:
1728       default_calib(pcs);
1729       break;
1730     case CMD_DATA:
1731       default_style(pcs);
1732       default_grade(pcs);
1733       break;
1734     case CMD_UNITS:
1735       default_units(pcs);
1736       break;
1737     default:
1738       compile_diagnostic(DIAG_ERR|DIAG_BUF|DIAG_SKIP, /*Unknown setting “%s”*/41, buffer);
1739    }
1740 }
1741 #endif
1742
1743 static void
1744 cmd_include(void)
1745 {
1746    char *pth, *fnm = NULL;
1747    int fnm_len;
1748 #ifndef NO_DEPRECATED
1749    prefix *root_store;
1750 #endif
1751    int ch_store;
1752
1753    pth = path_from_fnm(file.filename);
1754
1755    read_string(&fnm, &fnm_len);
1756
1757 #ifndef NO_DEPRECATED
1758    /* Since *begin / *end nesting cannot cross file boundaries we only
1759     * need to preserve the prefix if the deprecated *prefix command
1760     * can be used */
1761    root_store = root;
1762    root = pcs->Prefix; /* Root for include file is current prefix */
1763 #endif
1764    ch_store = ch;
1765
1766    data_file(pth, fnm);
1767
1768 #ifndef NO_DEPRECATED
1769    root = root_store; /* and restore root */
1770 #endif
1771    ch = ch_store;
1772
1773    s_free(&fnm);
1774    osfree(pth);
1775 }
1776
1777 static void
1778 cmd_sd(void)
1779 {
1780    real sd, variance;
1781    int units;
1782    unsigned long qmask, m;
1783    int quantity;
1784    qmask = get_qlist(BIT(Q_DECLINATION));
1785    if (!qmask) return; /* no quantities found - error already reported */
1786
1787    if (qmask == BIT(Q_DEFAULT)) {
1788       default_grade(pcs);
1789       return;
1790    }
1791    sd = read_numeric(fFalse);
1792    if (sd <= (real)0.0) {
1793       compile_diagnostic(DIAG_ERR|DIAG_SKIP|DIAG_COL, /*Standard deviation must be positive*/48);
1794       return;
1795    }
1796    units = get_units(qmask, fFalse);
1797    if (units == UNITS_NULL) return;
1798
1799    sd *= factor_tab[units];
1800    variance = sqrd(sd);
1801
1802    for (quantity = 0, m = BIT(quantity); m <= qmask; quantity++, m <<= 1)
1803       if (qmask & m) pcs->Var[quantity] = variance;
1804 }
1805
1806 static void
1807 cmd_title(void)
1808 {
1809    if (!fExplicitTitle && pcs->Prefix == root) {
1810        /* If we don't have an explicit title yet, and we're currently in the
1811         * root prefix, use this title explicitly. */
1812       fExplicitTitle = fTrue;
1813       read_string(&survey_title, &survey_title_len);
1814    } else {
1815       /* parse and throw away this title (but still check rest of line) */
1816       char *s = NULL;
1817       int len;
1818       read_string(&s, &len);
1819       s_free(&s);
1820    }
1821 }
1822
1823 static const sztok case_tab[] = {
1824      {"PRESERVE", OFF},
1825      {"TOLOWER",  LOWER},
1826      {"TOUPPER",  UPPER},
1827      {NULL,       -1}
1828 };
1829
1830 static void
1831 cmd_case(void)
1832 {
1833    int setting;
1834    get_token();
1835    setting = match_tok(case_tab, TABSIZE(case_tab));
1836    if (setting != -1) {
1837       pcs->Case = setting;
1838    } else {
1839       compile_diagnostic(DIAG_ERR|DIAG_BUF|DIAG_SKIP, /*Found “%s”, expecting “PRESERVE”, “TOUPPER”, or “TOLOWER”*/10, buffer);
1840    }
1841 }
1842
1843 typedef enum {
1844     CS_NONE = -1,
1845     CS_CUSTOM,
1846     CS_EPSG,
1847     CS_ESRI,
1848     CS_EUR,
1849     CS_IJTSK,
1850     CS_JTSK,
1851     CS_LAT,
1852     CS_LOCAL,
1853     CS_LONG,
1854     CS_OSGB,
1855     CS_S_MERC,
1856     CS_UTM
1857 } cs_class;
1858
1859 static const sztok cs_tab[] = {
1860      {"CUSTOM", CS_CUSTOM},
1861      {"EPSG",   CS_EPSG},       /* EPSG:<number> */
1862      {"ESRI",   CS_ESRI},       /* ESRI:<number> */
1863      {"EUR",    CS_EUR},        /* EUR79Z30 */
1864      {"IJTSK",  CS_IJTSK},      /* IJTSK or IJTSK03 */
1865      {"JTSK",   CS_JTSK},       /* JTSK or JTSK03 */
1866      {"LAT",    CS_LAT},        /* LAT-LONG */
1867      {"LOCAL",  CS_LOCAL},
1868      {"LONG",   CS_LONG},       /* LONG-LAT */
1869      {"OSGB",   CS_OSGB},       /* OSGB:<H, N, O, S or T><A-Z except I> */
1870      {"S",      CS_S_MERC},     /* S-MERC */
1871      {"UTM",    CS_UTM},        /* UTM<zone><N or S or nothing> */
1872      {NULL,     CS_NONE}
1873 };
1874
1875 static void
1876 cmd_cs(void)
1877 {
1878    char * proj_str = NULL;
1879    int proj_str_len;
1880    cs_class cs;
1881    int cs_sub = INT_MIN;
1882    filepos fp;
1883    bool output = fFalse;
1884    enum { YES, NO, MAYBE } ok_for_output = YES;
1885    static bool had_cs = fFalse;
1886
1887    if (!had_cs) {
1888       had_cs = fTrue;
1889       if (first_fix_name) {
1890          compile_diagnostic_at(DIAG_ERR,
1891                                first_fix_filename, first_fix_line,
1892                                /*Station “%s” fixed before CS command first used*/442,
1893                                sprint_prefix(first_fix_name));
1894       }
1895    }
1896
1897    get_pos(&fp);
1898    /* Note get_token() only accepts letters - it'll stop at digits so "UTM12"
1899     * will give token "UTM". */
1900    get_token();
1901    if (strcmp(ucbuffer, "OUT") == 0) {
1902       output = fTrue;
1903       get_pos(&fp);
1904       get_token();
1905    }
1906    cs = match_tok(cs_tab, TABSIZE(cs_tab));
1907    switch (cs) {
1908       case CS_NONE:
1909          break;
1910       case CS_CUSTOM:
1911          ok_for_output = MAYBE;
1912          get_pos(&fp);
1913          read_string(&proj_str, &proj_str_len);
1914          cs_sub = 0;
1915          break;
1916       case CS_EPSG: case CS_ESRI:
1917          ok_for_output = MAYBE;
1918          if (ch == ':' && isdigit(nextch())) {
1919             unsigned n = read_uint();
1920             if (n < 1000000) {
1921                cs_sub = (int)n;
1922             }
1923          }
1924          break;
1925       case CS_EUR:
1926          if (isdigit(ch) &&
1927              read_uint() == 79 &&
1928              (ch == 'Z' || ch == 'z') &&
1929              isdigit(nextch()) &&
1930              read_uint() == 30) {
1931             cs_sub = 7930;
1932          }
1933          break;
1934       case CS_JTSK:
1935          ok_for_output = NO;
1936          /* FALLTHRU */
1937       case CS_IJTSK:
1938          if (ch == '0') {
1939             if (nextch() == '3') {
1940                nextch();
1941                cs_sub = 3;
1942             }
1943          } else {
1944             cs_sub = 0;
1945          }
1946          break;
1947       case CS_LAT: case CS_LONG:
1948          ok_for_output = NO;
1949          if (ch == '-') {
1950             nextch();
1951             get_token_no_blanks();
1952             cs_class cs2 = match_tok(cs_tab, TABSIZE(cs_tab));
1953             if ((cs ^ cs2) == (CS_LAT ^ CS_LONG)) {
1954                 cs_sub = 0;
1955             }
1956          }
1957          break;
1958       case CS_LOCAL:
1959          cs_sub = 0;
1960          break;
1961       case CS_OSGB:
1962          if (ch == ':') {
1963             int uch1 = toupper(nextch());
1964             if (strchr("HNOST", uch1)) {
1965                int uch2 = toupper(nextch());
1966                if (uch2 >= 'A' && uch2 <= 'Z' && uch2 != 'I') {
1967                   int x, y;
1968                   nextch();
1969                   if (uch1 > 'I') --uch1;
1970                   uch1 -= 'A';
1971                   if (uch2 > 'I') --uch2;
1972                   uch2 -= 'A';
1973                   x = uch1 % 5;
1974                   y = uch1 / 5;
1975                   x = (x * 5) + uch2 % 5;
1976                   y = (y * 5) + uch2 / 5;
1977                   cs_sub = y * 25 + x;
1978                }
1979             }
1980          }
1981          break;
1982       case CS_S_MERC:
1983          if (ch == '-') {
1984             nextch();
1985             get_token_no_blanks();
1986             if (strcmp(ucbuffer, "MERC") == 0) {
1987                cs_sub = 0;
1988             }
1989          }
1990          break;
1991       case CS_UTM:
1992          if (isdigit(ch)) {
1993             unsigned n = read_uint();
1994             if (n >= 1 && n <= 60) {
1995                int uch = toupper(ch);
1996                cs_sub = (int)n;
1997                if (uch == 'S') {
1998                   nextch();
1999                   cs_sub = -cs_sub;
2000                } else if (uch == 'N') {
2001                   nextch();
2002                }
2003             }
2004          }
2005          break;
2006    }
2007    if (cs_sub == INT_MIN || isalnum(ch)) {
2008       set_pos(&fp);
2009       compile_diagnostic(DIAG_ERR|DIAG_TOKEN, /*Unknown coordinate system*/434);
2010       skipline();
2011       return;
2012    }
2013    /* Actually handle the cs */
2014    switch (cs) {
2015       case CS_NONE:
2016          break;
2017       case CS_CUSTOM:
2018          /* proj_str already set */
2019          break;
2020       case CS_EPSG:
2021          proj_str = osmalloc(32);
2022          sprintf(proj_str, "+init=epsg:%d +no_defs", cs_sub);
2023          break;
2024       case CS_ESRI:
2025          proj_str = osmalloc(32);
2026          sprintf(proj_str, "+init=esri:%d +no_defs", cs_sub);
2027          break;
2028       case CS_EUR:
2029          proj_str = osstrdup("+proj=utm +zone=30 +ellps=intl +towgs84=-86,-98,-119,0,0,0,0 +no_defs");
2030          break;
2031       case CS_IJTSK:
2032          if (cs_sub == 0)
2033             proj_str = osstrdup("+proj=krovak +ellps=bessel +towgs84=570.8285,85.6769,462.842,4.9984,1.5867,5.2611,3.5623 +no_defs");
2034          else
2035             proj_str = osstrdup("+proj=krovak +ellps=bessel +towgs84=485.021,169.465,483.839,7.786342,4.397554,4.102655,0 +no_defs");
2036          break;
2037       case CS_JTSK:
2038          if (cs_sub == 0)
2039             proj_str = osstrdup("+proj=krovak +czech +ellps=bessel +towgs84=570.8285,85.6769,462.842,4.9984,1.5867,5.2611,3.5623 +no_defs");
2040          else
2041             proj_str = osstrdup("+proj=krovak +czech +ellps=bessel +towgs84=485.021,169.465,483.839,7.786342,4.397554,4.102655,0 +no_defs");
2042          break;
2043       case CS_LAT:
2044          /* FIXME: Requires PROJ >= 4.8.0 for +axis, and the SDs will be
2045           * misapplied, so we may want to swap ourselves.  Also, while
2046           * therion supports lat-long, I'm not totally convinced that it is
2047           * sensible to do so - people often say "lat-long", but probably
2048           * don't think that that's actually "Northing, Easting".  This
2049           * seems like it'll result in people accidentally getting X and Y
2050           * swapped in their fixed points...
2051           */
2052 #if 0
2053          proj_str = osstrdup("+proj=longlat +ellps=WGS84 +datum=WGS84 +axis=neu +no_defs");
2054 #endif
2055          break;
2056       case CS_LOCAL:
2057          /* FIXME: Is it useful to be able to explicitly specify this? */
2058          break;
2059       case CS_LONG:
2060          proj_str = osstrdup("+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs");
2061          break;
2062       case CS_OSGB: {
2063          int x = 14 - (cs_sub % 25);
2064          int y = (cs_sub / 25) - 20;
2065          proj_str = osmalloc(160);
2066          sprintf(proj_str, "+proj=tmerc +lat_0=49 +lon_0=-2 +k=0.9996012717 +x_0=%d +y_0=%d +ellps=airy +datum=OSGB36 +units=m +no_defs", x * 100000, y * 100000);
2067          break;
2068       }
2069       case CS_S_MERC:
2070          proj_str = osstrdup("+proj=merc +lat_ts=0 +lon_0=0 +k=1 +x_0=0 +y_0=0 +a=6378137 +b=6378137 +units=m +nadgrids=@null +no_defs");
2071          break;
2072       case CS_UTM:
2073          proj_str = osmalloc(74);
2074          if (cs_sub > 0) {
2075             sprintf(proj_str, "+proj=utm +ellps=WGS84 +datum=WGS84 +units=m +zone=%d +no_defs", cs_sub);
2076          } else {
2077             sprintf(proj_str, "+proj=utm +ellps=WGS84 +datum=WGS84 +units=m +zone=%d +south +no_defs", -cs_sub);
2078          }
2079          break;
2080    }
2081
2082    if (!proj_str) {
2083       /* printf("CS %d:%d\n", (int)cs, cs_sub); */
2084       set_pos(&fp);
2085       compile_diagnostic(DIAG_ERR|DIAG_TOKEN, /*Unknown coordinate system*/434);
2086       skipline();
2087       return;
2088    }
2089
2090    if (output) {
2091       if (ok_for_output == NO) {
2092          set_pos(&fp);
2093          compile_diagnostic(DIAG_ERR|DIAG_TOKEN, /*Coordinate system unsuitable for output*/435);
2094          skipline();
2095          return;
2096       }
2097
2098       /* If the output projection is already set, we still need to create the
2099        * projection object for a custom projection, so we can report errors.
2100        * But if the string is identical, we know it's valid.
2101        */
2102       if (!proj_out ||
2103           (ok_for_output == MAYBE && strcmp(proj_str, proj_str_out) != 0)) {
2104          projPJ pj = pj_init_plus(proj_str);
2105          if (!pj) {
2106             set_pos(&fp);
2107             compile_diagnostic(DIAG_ERR|DIAG_TOKEN, /*Invalid coordinate system: %s*/443,
2108                                pj_strerrno(pj_errno));
2109             skipline();
2110             return;
2111          }
2112          if (ok_for_output == MAYBE && pj_is_latlong(pj)) {
2113             set_pos(&fp);
2114             compile_diagnostic(DIAG_ERR|DIAG_TOKEN, /*Coordinate system unsuitable for output*/435);
2115             skipline();
2116             return;
2117          }
2118          if (proj_out) {
2119             pj_free(pj);
2120             osfree(proj_str);
2121          } else {
2122             proj_out = pj;
2123             proj_str_out = proj_str;
2124          }
2125       }
2126    } else {
2127       projPJ pj;
2128       if (proj_str_out && strcmp(proj_str, proj_str_out) == 0) {
2129          /* Same as the current output projection. */
2130          pj = proj_out;
2131       } else {
2132          pj = pj_init_plus(proj_str);
2133          if (!pj) {
2134             set_pos(&fp);
2135             compile_diagnostic(DIAG_ERR|DIAG_TOKEN, /*Invalid coordinate system: %s*/443,
2136                                pj_strerrno(pj_errno));
2137             skipline();
2138             return;
2139          }
2140       }
2141
2142       /* Free proj if not used by parent, or as the output projection. */
2143       settings * p = pcs;
2144       if (p->proj && (!p->next || p->proj != p->next->proj))
2145          if (p->proj != proj_out)
2146             pj_free(p->proj);
2147       p->proj = pj;
2148    }
2149 }
2150
2151 static const sztok infer_tab[] = {
2152      { "EQUATES",       INFER_EQUATES },
2153      { "EXPORTS",       INFER_EXPORTS },
2154      { "PLUMBS",        INFER_PLUMBS },
2155 #if 0 /* FIXME */
2156      { "SUBSURVEYS",    INFER_SUBSURVEYS },
2157 #endif
2158      { NULL,            INFER_NULL }
2159 };
2160
2161 static const sztok onoff_tab[] = {
2162      { "OFF", 0 },
2163      { "ON",  1 },
2164      { NULL, -1 }
2165 };
2166
2167 static void
2168 cmd_infer(void)
2169 {
2170    infer_what setting;
2171    int on;
2172    get_token();
2173    setting = match_tok(infer_tab, TABSIZE(infer_tab));
2174    if (setting == INFER_NULL) {
2175       compile_diagnostic(DIAG_ERR|DIAG_BUF|DIAG_SKIP, /*Found “%s”, expecting “EQUATES”, “EXPORTS”, or “PLUMBS”*/31, buffer);
2176       return;
2177    }
2178    get_token();
2179    on = match_tok(onoff_tab, TABSIZE(onoff_tab));
2180    if (on == -1) {
2181       compile_diagnostic(DIAG_ERR|DIAG_BUF|DIAG_SKIP, /*Found “%s”, expecting “ON” or “OFF”*/32, buffer);
2182       return;
2183    }
2184
2185    if (on) {
2186       pcs->infer |= BIT(setting);
2187       if (setting == INFER_EXPORTS) fExportUsed = fTrue;
2188    } else {
2189       pcs->infer &= ~BIT(setting);
2190    }
2191 }
2192
2193 static void
2194 cmd_truncate(void)
2195 {
2196    unsigned int truncate_at = 0; /* default is no truncation */
2197    filepos fp;
2198
2199    get_pos(&fp);
2200
2201    get_token();
2202    if (strcmp(ucbuffer, "OFF") != 0) {
2203       if (*ucbuffer) set_pos(&fp);
2204       truncate_at = read_uint();
2205    }
2206    /* for backward compatibility, "*truncate 0" means "*truncate off" */
2207    pcs->Truncate = (truncate_at == 0) ? INT_MAX : truncate_at;
2208 }
2209
2210 static void
2211 cmd_ref(void)
2212 {
2213    /* Just syntax check for now. */
2214    char *ref = NULL;
2215    int ref_len;
2216    read_string(&ref, &ref_len);
2217    s_free(&ref);
2218 }
2219
2220 static void
2221 cmd_require(void)
2222 {
2223    const unsigned int version[] = {COMMAVERSION};
2224    const unsigned int *ver = version;
2225    filepos fp;
2226
2227    skipblanks();
2228    get_pos(&fp);
2229    while (1) {
2230       int diff = *ver++ - read_uint();
2231       if (diff > 0) break;
2232       if (diff < 0) {
2233          size_t i, len;
2234          char *v;
2235          filepos fp_tmp;
2236
2237          /* find end of version number */
2238          while (isdigit(ch) || ch == '.') nextch();
2239          get_pos(&fp_tmp);
2240          len = (size_t)(fp_tmp.offset - fp.offset);
2241          v = osmalloc(len + 1);
2242          set_pos(&fp);
2243          for (i = 0; i < len; i++) {
2244             v[i] = ch;
2245             nextch();
2246          }
2247          v[i] = '\0';
2248          /* TRANSLATORS: Feel free to translate as "or newer" instead of "or
2249           * greater" if that gives a more natural translation.  It's
2250           * technically not quite right when there are parallel active release
2251           * series (e.g. Survex 1.0.40 was released *after* 1.2.0), but this
2252           * seems unlikely to confuse users.  "Survex" is the name of the
2253           * software, so should not be translated.
2254           *
2255           * Here "survey" is a "cave map" rather than list of questions - it should be
2256           * translated to the terminology that cavers using the language would use.
2257           */
2258          fatalerror_in_file(file.filename, file.line, /*Survex version %s or greater required to process this survey data.*/2, v);
2259       }
2260       if (ch != '.') break;
2261       nextch();
2262       if (!isdigit(ch) || ver == version + sizeof(version) / sizeof(*version))
2263          break;
2264    }
2265    /* skip rest of version number */
2266    while (isdigit(ch) || ch == '.') nextch();
2267 }
2268
2269 /* allocate new meta_data if need be */
2270 void
2271 copy_on_write_meta(settings *s)
2272 {
2273    if (!s->meta || s->meta->ref_count != 0) {
2274        meta_data * meta_new = osnew(meta_data);
2275        if (!s->meta) {
2276            meta_new->days1 = meta_new->days2 = -1;
2277        } else {
2278            *meta_new = *(s->meta);
2279        }
2280        meta_new->ref_count = 0;
2281        s->meta = meta_new;
2282    }
2283 }
2284
2285 static void
2286 cmd_date(void)
2287 {
2288     int year, month, day;
2289     int days1, days2;
2290     bool implicit_range = fFalse;
2291     filepos fp, fp2;
2292
2293     get_pos(&fp);
2294     read_date(&year, &month, &day);
2295     days1 = days_since_1900(year, month ? month : 1, day ? day : 1);
2296
2297     if (days1 > current_days_since_1900) {
2298         set_pos(&fp);
2299         compile_diagnostic(DIAG_WARN|DIAG_DATE, /*Date is in the future!*/80);
2300     }
2301
2302     skipblanks();
2303     if (ch == '-') {
2304         nextch();
2305         get_pos(&fp2);
2306         read_date(&year, &month, &day);
2307     } else {
2308         if (month && day) {
2309             days2 = days1;
2310             goto read;
2311         }
2312         implicit_range = fTrue;
2313     }
2314
2315     if (month == 0) month = 12;
2316     if (day == 0) day = last_day(year, month);
2317     days2 = days_since_1900(year, month, day);
2318
2319     if (!implicit_range && days2 > current_days_since_1900) {
2320         set_pos(&fp2);
2321         compile_diagnostic(DIAG_WARN|DIAG_DATE, /*Date is in the future!*/80);
2322     }
2323
2324     if (days2 < days1) {
2325         set_pos(&fp);
2326         compile_diagnostic(DIAG_ERR|DIAG_TOKEN, /*End of date range is before the start*/81);
2327         int tmp = days1;
2328         days1 = days2;
2329         days2 = tmp;
2330     }
2331
2332 read:
2333     if (!pcs->meta || pcs->meta->days1 != days1 || pcs->meta->days2 != days2) {
2334         copy_on_write_meta(pcs);
2335         pcs->meta->days1 = days1;
2336         pcs->meta->days2 = days2;
2337         /* Invalidate cached declination. */
2338         pcs->declination = HUGE_REAL;
2339     }
2340 }
2341
2342 typedef void (*cmd_fn)(void);
2343
2344 static const cmd_fn cmd_funcs[] = {
2345    cmd_alias,
2346    cmd_begin,
2347    cmd_calibrate,
2348    cmd_case,
2349    skipline, /*cmd_copyright,*/
2350    cmd_cs,
2351    cmd_data,
2352    cmd_date,
2353    cmd_declination,
2354 #ifndef NO_DEPRECATED
2355    cmd_default,
2356 #endif
2357    cmd_end,
2358    cmd_entrance,
2359    cmd_equate,
2360    cmd_export,
2361    cmd_fix,
2362    cmd_flags,
2363    cmd_include,
2364    cmd_infer,
2365    skipline, /*cmd_instrument,*/
2366 #ifndef NO_DEPRECATED
2367    cmd_prefix,
2368 #endif
2369    cmd_ref,
2370    cmd_require,
2371    cmd_sd,
2372    cmd_set,
2373    solve_network,
2374    skipline, /*cmd_team,*/
2375    cmd_title,
2376    cmd_truncate,
2377    cmd_units
2378 };
2379
2380 extern void
2381 handle_command(void)
2382 {
2383    int cmdtok;
2384    get_token();
2385    cmdtok = match_tok(cmd_tab, TABSIZE(cmd_tab));
2386
2387    if (cmdtok < 0 || cmdtok >= (int)(sizeof(cmd_funcs) / sizeof(cmd_fn))) {
2388       compile_diagnostic(DIAG_ERR|DIAG_BUF|DIAG_SKIP, /*Unknown command “%s”*/12, buffer);
2389       return;
2390    }
2391
2392    switch (cmdtok) {
2393     case CMD_EXPORT:
2394       if (!f_export_ok)
2395          /* TRANSLATORS: The *EXPORT command is only valid just after *BEGIN
2396           * <SURVEY>, so this would generate this error:
2397           *
2398           * *begin fred
2399           * 1 2 1.23 045 -6
2400           * *export 2
2401           * *end fred */
2402          compile_diagnostic(DIAG_ERR, /**EXPORT must immediately follow “*BEGIN <SURVEY>”*/57);
2403       break;
2404     case CMD_ALIAS:
2405     case CMD_CALIBRATE:
2406     case CMD_CASE:
2407     case CMD_COPYRIGHT:
2408     case CMD_CS:
2409     case CMD_DATA:
2410     case CMD_DATE:
2411     case CMD_DECLINATION:
2412     case CMD_DEFAULT:
2413     case CMD_FLAGS:
2414     case CMD_INFER:
2415     case CMD_INSTRUMENT:
2416     case CMD_REF:
2417     case CMD_REQUIRE:
2418     case CMD_SD:
2419     case CMD_SET:
2420     case CMD_TEAM:
2421     case CMD_TITLE:
2422     case CMD_TRUNCATE:
2423     case CMD_UNITS:
2424       /* These can occur between *begin and *export */
2425       break;
2426     default:
2427       /* NB: additional handling for "*begin <survey>" in cmd_begin */
2428       f_export_ok = fFalse;
2429       break;
2430    }
2431
2432    cmd_funcs[cmdtok]();
2433 }