src/commands.c

   1 /* commands.c
   2  * Code for directives
   3  * Copyright (C) 1991-2003,2004,2005,2006,2010,2011,2012,2013,2014,2015,2016,2019 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.h>
  30 #if PROJ_VERSION_MAJOR < 8 || \
  31     (PROJ_VERSION_MAJOR == 8 && PROJ_VERSION_MINOR < 2)
  32 // Needed for proj_factors workaround
  33 # include <proj_experimental.h>
  34 #endif
  35
  36 #include "cavern.h"
  37 #include "commands.h"
  38 #include "datain.h"
  39 #include "date.h"
  40 #include "debug.h"
  41 #include "filename.h"
  42 #include "message.h"
  43 #include "netbits.h"
  44 #include "netskel.h"
  45 #include "out.h"
  46 #include "readval.h"
  47 #include "str.h"
  48
  49 #define WGS84_DATUM_STRING "EPSG:4326"
  50
  51 static void
  52 default_grade(settings *s)
  53 {
  54    /* Values correspond to those in bcra5.svx */
  55    s->Var[Q_POS] = (real)sqrd(0.05);
  56    s->Var[Q_LENGTH] = (real)sqrd(0.05);
  57    s->Var[Q_BACKLENGTH] = (real)sqrd(0.05);
  58    s->Var[Q_COUNT] = (real)sqrd(0.05);
  59    s->Var[Q_DX] = s->Var[Q_DY] = s->Var[Q_DZ] = (real)sqrd(0.05);
  60    s->Var[Q_BEARING] = (real)sqrd(rad(0.5));
  61    s->Var[Q_GRADIENT] = (real)sqrd(rad(0.5));
  62    s->Var[Q_BACKBEARING] = (real)sqrd(rad(0.5));
  63    s->Var[Q_BACKGRADIENT] = (real)sqrd(rad(0.5));
  64    /* SD of plumbed legs (0.25 degrees?) */
  65    s->Var[Q_PLUMB] = (real)sqrd(rad(0.25));
  66    /* SD of level legs (0.25 degrees?) */
  67    s->Var[Q_LEVEL] = (real)sqrd(rad(0.25));
  68    s->Var[Q_DEPTH] = (real)sqrd(0.05);
  69 }
  70
  71 static void
  72 default_truncate(settings *s)
  73 {
  74    s->Truncate = INT_MAX;
  75 }
  76
  77 static void
  78 default_case(settings *s)
  79 {
  80    s->Case = LOWER;
  81 }
  82
  83 static reading default_order[] = { Fr, To, Tape, Comp, Clino, End };
  84
  85 static void
  86 default_style(settings *s)
  87 {
  88    s->style = STYLE_NORMAL;
  89    s->ordering = default_order;
  90    s->dash_for_anon_wall_station = fFalse;
  91 }
  92
  93 static void
  94 default_prefix(settings *s)
  95 {
  96    s->Prefix = root;
  97 }
  98
  99 static void
 100 default_translate(settings *s)
 101 {
 102    int i;
 103    short *t;
 104    if (s->next && s->next->Translate == s->Translate) {
 105       t = ((short*)osmalloc(ossizeof(short) * 257)) + 1;
 106       memcpy(t - 1, s->Translate - 1, sizeof(short) * 257);
 107       s->Translate = t;
 108    }
 109 /*  SVX_ASSERT(EOF==-1);*/ /* important, since we rely on this */
 110    t = s->Translate;
 111    memset(t - 1, 0, sizeof(short) * 257);
 112    for (i = '0'; i <= '9'; i++) t[i] = SPECIAL_NAMES;
 113    for (i = 'A'; i <= 'Z'; i++) t[i] = SPECIAL_NAMES;
 114    for (i = 'a'; i <= 'z'; i++) t[i] = SPECIAL_NAMES;
 115
 116    t['\t'] |= SPECIAL_BLANK;
 117    t[' '] |= SPECIAL_BLANK;
 118    t[','] |= SPECIAL_BLANK;
 119    t[';'] |= SPECIAL_COMMENT;
 120    t['\032'] |= SPECIAL_EOL; /* Ctrl-Z, so olde DOS text files are handled ok */
 121    t[EOF] |= SPECIAL_EOL;
 122    t['\n'] |= SPECIAL_EOL;
 123    t['\r'] |= SPECIAL_EOL;
 124    t['*'] |= SPECIAL_KEYWORD;
 125    t['-'] |= SPECIAL_OMIT;
 126    t['\\'] |= SPECIAL_ROOT;
 127    t['.'] |= SPECIAL_SEPARATOR;
 128    t['_'] |= SPECIAL_NAMES;
 129    t['-'] |= SPECIAL_NAMES; /* Added in 0.97 prerelease 4 */
 130    t['.'] |= SPECIAL_DECIMAL;
 131    t['-'] |= SPECIAL_MINUS;
 132    t['+'] |= SPECIAL_PLUS;
 133 #if 0 /* FIXME */
 134    t['{'] |= SPECIAL_OPEN;
 135    t['}'] |= SPECIAL_CLOSE;
 136 #endif
 137 }
 138
 139 void
 140 default_units(settings *s)
 141 {
 142    int quantity;
 143    for (quantity = 0; quantity < Q_MAC; quantity++) {
 144       if (TSTBIT(ANG_QMASK, quantity))
 145          s->units[quantity] = (real)(M_PI / 180.0); /* degrees */
 146       else
 147          s->units[quantity] = (real)1.0; /* metres */
 148    }
 149    s->f_clino_percent = s->f_backclino_percent = fFalse;
 150    s->f_bearing_quadrants = s->f_backbearing_quadrants = fFalse;
 151 }
 152
 153 void
 154 default_calib(settings *s)
 155 {
 156    int quantity;
 157    for (quantity = 0; quantity < Q_MAC; quantity++) {
 158       s->z[quantity] = (real)0.0;
 159       s->sc[quantity] = (real)1.0;
 160    }
 161 }
 162
 163 static void
 164 default_flags(settings *s)
 165 {
 166    s->flags = 0;
 167 }
 168
 169 extern void
 170 default_all(settings *s)
 171 {
 172    default_truncate(s);
 173    s->infer = 0;
 174    default_case(s);
 175    default_style(s);
 176    default_prefix(s);
 177    default_translate(s);
 178    default_grade(s);
 179    default_units(s);
 180    default_calib(s);
 181    default_flags(s);
 182 }
 183
 184 char *buffer = NULL;
 185 static int buf_len;
 186
 187 static char *ucbuffer = NULL;
 188
 189 /* read token */
 190 extern void
 191 get_token(void)
 192 {
 193    skipblanks();
 194    get_token_no_blanks();
 195 }
 196
 197 extern void
 198 get_token_no_blanks(void)
 199 {
 200    int i = -1;
 201
 202    s_zero(&buffer);
 203    osfree(ucbuffer);
 204    while (isalpha(ch)) {
 205       s_catchar(&buffer, &buf_len, (char)ch);
 206       nextch();
 207    }
 208
 209    if (!buffer) s_catchar(&buffer, &buf_len, '\0');
 210
 211    ucbuffer = osmalloc(buf_len);
 212    do {
 213       i++;
 214       ucbuffer[i] = toupper(buffer[i]);
 215    } while (buffer[i]);
 216 #if 0
 217    printf("get_token_no_blanks() got “%s”\n", buffer);
 218 #endif
 219 }
 220
 221 /* read word */
 222 static void
 223 get_word(void)
 224 {
 225    s_zero(&buffer);
 226    skipblanks();
 227    while (!isBlank(ch) && !isEol(ch)) {
 228       s_catchar(&buffer, &buf_len, (char)ch);
 229       nextch();
 230    }
 231
 232    if (!buffer) s_catchar(&buffer, &buf_len, '\0');
 233 #if 0
 234    printf("get_word() got “%s”\n", buffer);
 235 #endif
 236 }
 237
 238 /* match_tok() now uses binary chop
 239  * tab argument should be alphabetically sorted (ascending)
 240  */
 241 extern int
 242 match_tok(const sztok *tab, int tab_size)
 243 {
 244    int a = 0, b = tab_size - 1, c;
 245    int r;
 246    assert(tab_size > 0); /* catch empty table */
 247 /*  printf("[%d,%d]",a,b); */
 248    while (a <= b) {
 249       c = (unsigned)(a + b) / 2;
 250 /*     printf(" %d",c); */
 251       r = strcmp(tab[c].sz, ucbuffer);
 252       if (r == 0) return tab[c].tok; /* match */
 253       if (r < 0)
 254          a = c + 1;
 255       else
 256          b = c - 1;
 257    }
 258    return tab[tab_size].tok; /* no match */
 259 }
 260
 261 typedef enum {
 262    CMD_NULL = -1, CMD_ALIAS, CMD_BEGIN, CMD_CALIBRATE, CMD_CASE, CMD_COPYRIGHT,
 263    CMD_CS, CMD_DATA, CMD_DATE, CMD_DECLINATION, CMD_DEFAULT, CMD_END,
 264    CMD_ENTRANCE, CMD_EQUATE, CMD_EXPORT, CMD_FIX, CMD_FLAGS, CMD_INCLUDE,
 265    CMD_INFER, CMD_INSTRUMENT, CMD_PREFIX, CMD_REF, CMD_REQUIRE, CMD_SD,
 266    CMD_SET, CMD_SOLVE, CMD_TEAM, CMD_TITLE, CMD_TRUNCATE, CMD_UNITS
 267 } cmds;
 268
 269 static const sztok cmd_tab[] = {
 270      {"ALIAS",     CMD_ALIAS},
 271      {"BEGIN",     CMD_BEGIN},
 272      {"CALIBRATE", CMD_CALIBRATE},
 273      {"CASE",      CMD_CASE},
 274      {"COPYRIGHT", CMD_COPYRIGHT},
 275      {"CS",        CMD_CS},
 276      {"DATA",      CMD_DATA},
 277      {"DATE",      CMD_DATE},
 278      {"DECLINATION", CMD_DECLINATION},
 279 #ifndef NO_DEPRECATED
 280      {"DEFAULT",   CMD_DEFAULT},
 281 #endif
 282      {"END",       CMD_END},
 283      {"ENTRANCE",  CMD_ENTRANCE},
 284      {"EQUATE",    CMD_EQUATE},
 285      {"EXPORT",    CMD_EXPORT},
 286      {"FIX",       CMD_FIX},
 287      {"FLAGS",     CMD_FLAGS},
 288      {"INCLUDE",   CMD_INCLUDE},
 289      {"INFER",     CMD_INFER},
 290      {"INSTRUMENT",CMD_INSTRUMENT},
 291 #ifndef NO_DEPRECATED
 292      {"PREFIX",    CMD_PREFIX},
 293 #endif
 294      {"REF",       CMD_REF},
 295      {"REQUIRE",   CMD_REQUIRE},
 296      {"SD",        CMD_SD},
 297      {"SET",       CMD_SET},
 298      {"SOLVE",     CMD_SOLVE},
 299      {"TEAM",      CMD_TEAM},
 300      {"TITLE",     CMD_TITLE},
 301      {"TRUNCATE",  CMD_TRUNCATE},
 302      {"UNITS",     CMD_UNITS},
 303      {NULL,        CMD_NULL}
 304 };
 305
 306 /* masks for units which are length and angles respectively */
 307 #define LEN_UMASK (BIT(UNITS_METRES) | BIT(UNITS_FEET) | BIT(UNITS_YARDS))
 308 #define ANG_UMASK (BIT(UNITS_DEGS) | BIT(UNITS_GRADS) | BIT(UNITS_MINUTES))
 309
 310 /* ordering must be the same as the units enum */
 311 const real factor_tab[] = {
 312    1.0, METRES_PER_FOOT, (METRES_PER_FOOT*3.0),
 313    (M_PI/180.0), (M_PI/180.0), (M_PI/200.0), 0.01, (M_PI/180.0/60.0)
 314 };
 315
 316 const int units_to_msgno[] = {
 317     /*m*/424,
 318     /*ft*/428,
 319     -1, /* yards */
 320     /*°*/344, /* quadrants */
 321     /*°*/344,
 322     /*ᵍ*/345,
 323     /*%*/96,
 324     -1 /* minutes */
 325 };
 326
 327 int get_length_units(int quantity) {
 328     double factor = pcs->units[quantity];
 329     if (fabs(factor - METRES_PER_FOOT) <= REAL_EPSILON ||
 330         fabs(factor - METRES_PER_FOOT * 3.0) <= REAL_EPSILON) {
 331         return UNITS_FEET;
 332     }
 333     return UNITS_METRES;
 334 }
 335
 336 int get_angle_units(int quantity) {
 337     double factor = pcs->units[quantity];
 338     if (fabs(factor - M_PI / 200.0) <= REAL_EPSILON) {
 339         return UNITS_GRADS;
 340     }
 341     return UNITS_DEGS;
 342 }
 343
 344 static int
 345 get_units(unsigned long qmask, bool percent_ok)
 346 {
 347    static const sztok utab[] = {
 348         {"DEGREES",       UNITS_DEGS },
 349         {"DEGS",          UNITS_DEGS },
 350         {"FEET",          UNITS_FEET },
 351         {"GRADS",         UNITS_GRADS },
 352         {"METERS",        UNITS_METRES },
 353         {"METRES",        UNITS_METRES },
 354         {"METRIC",        UNITS_METRES },
 355         {"MILS",          UNITS_DEPRECATED_ALIAS_FOR_GRADS },
 356         {"MINUTES",       UNITS_MINUTES },
 357         {"PERCENT",       UNITS_PERCENT },
 358         {"PERCENTAGE",    UNITS_PERCENT },
 359         {"QUADRANTS",     UNITS_QUADRANTS },
 360         {"QUADS",         UNITS_QUADRANTS },
 361         {"YARDS",         UNITS_YARDS },
 362         {NULL,            UNITS_NULL }
 363    };
 364    int units;
 365    get_token();
 366    units = match_tok(utab, TABSIZE(utab));
 367    if (units == UNITS_NULL) {
 368       compile_diagnostic(DIAG_ERR|DIAG_BUF|DIAG_SKIP, /*Unknown units “%s”*/35, buffer);
 369       return UNITS_NULL;
 370    }
 371    /* Survex has long misdefined "mils" as an alias for "grads", of which
 372     * there are 400 in a circle.  There are several definitions of "mils"
 373     * with a circle containing 2000π SI milliradians, 6400 NATO mils, 6000
 374     * Warsaw Pact mils, and 6300 Swedish streck, and they aren't in common
 375     * use by cave surveyors, so we now just warn if mils are used.
 376     */
 377    if (units == UNITS_DEPRECATED_ALIAS_FOR_GRADS) {
 378       compile_diagnostic(DIAG_WARN|DIAG_BUF|DIAG_SKIP,
 379                          /*Units “%s” are deprecated, assuming “grads” - see manual for details*/479,
 380                          buffer);
 381       units = UNITS_GRADS;
 382    }
 383    if (units == UNITS_PERCENT && percent_ok &&
 384        !(qmask & ~(BIT(Q_GRADIENT)|BIT(Q_BACKGRADIENT)))) {
 385       return units;
 386    }
 387    if (units == UNITS_QUADRANTS &&
 388        !(qmask & ~(BIT(Q_BEARING)|BIT(Q_BACKBEARING)))) {
 389       return units;
 390    }
 391    if (((qmask & LEN_QMASK) && !TSTBIT(LEN_UMASK, units)) ||
 392        ((qmask & ANG_QMASK) && !TSTBIT(ANG_UMASK, units))) {
 393       /* TRANSLATORS: Note: In English you talk about the *units* of a single
 394        * measurement, but the correct term in other languages may be singular.
 395        */
 396       compile_diagnostic(DIAG_ERR|DIAG_BUF|DIAG_SKIP, /*Invalid units “%s” for quantity*/37, buffer);
 397       return UNITS_NULL;
 398    }
 399    return units;
 400 }
 401
 402 /* returns mask with bit x set to indicate quantity x specified */
 403 static unsigned long
 404 get_qlist(unsigned long mask_bad)
 405 {
 406    static const sztok qtab[] = {
 407         {"ALTITUDE",     Q_DZ },
 408         {"BACKBEARING",  Q_BACKBEARING },
 409         {"BACKCLINO",    Q_BACKGRADIENT },    /* alternative name */
 410         {"BACKCOMPASS",  Q_BACKBEARING },     /* alternative name */
 411         {"BACKGRADIENT", Q_BACKGRADIENT },
 412         {"BACKLENGTH",   Q_BACKLENGTH },
 413         {"BACKTAPE",     Q_BACKLENGTH },    /* alternative name */
 414         {"BEARING",      Q_BEARING },
 415         {"CEILING",      Q_UP },          /* alternative name */
 416         {"CLINO",        Q_GRADIENT },    /* alternative name */
 417         {"COMPASS",      Q_BEARING },     /* alternative name */
 418         {"COUNT",        Q_COUNT },
 419         {"COUNTER",      Q_COUNT },       /* alternative name */
 420         {"DECLINATION",  Q_DECLINATION },
 421         {"DEFAULT",      Q_DEFAULT }, /* not a real quantity... */
 422         {"DEPTH",        Q_DEPTH },
 423         {"DOWN",         Q_DOWN },
 424         {"DX",           Q_DX },          /* alternative name */
 425         {"DY",           Q_DY },          /* alternative name */
 426         {"DZ",           Q_DZ },          /* alternative name */
 427         {"EASTING",      Q_DX },
 428         {"FLOOR",        Q_DOWN },        /* alternative name */
 429         {"GRADIENT",     Q_GRADIENT },
 430         {"LEFT",         Q_LEFT },
 431         {"LENGTH",       Q_LENGTH },
 432         {"LEVEL",        Q_LEVEL},
 433         {"NORTHING",     Q_DY },
 434         {"PLUMB",        Q_PLUMB},
 435         {"POSITION",     Q_POS },
 436         {"RIGHT",        Q_RIGHT },
 437         {"TAPE",         Q_LENGTH },      /* alternative name */
 438         {"UP",           Q_UP },
 439         {NULL,           Q_NULL }
 440    };
 441    unsigned long qmask = 0;
 442    int tok;
 443    filepos fp;
 444
 445    while (1) {
 446       get_pos(&fp);
 447       get_token();
 448       tok = match_tok(qtab, TABSIZE(qtab));
 449       if (tok == Q_DEFAULT && !(mask_bad & BIT(Q_DEFAULT))) {
 450           /* Only recognise DEFAULT if it is the first quantity, and then don't
 451            * look for any more. */
 452           if (qmask == 0)
 453               return BIT(Q_DEFAULT);
 454           break;
 455       }
 456       /* bail out if we reach the table end with no match */
 457       if (tok == Q_NULL) break;
 458       qmask |= BIT(tok);
 459       if (qmask & mask_bad) {
 460          compile_diagnostic(DIAG_ERR|DIAG_BUF|DIAG_SKIP, /*Unknown instrument “%s”*/39, buffer);
 461          return 0;
 462       }
 463    }
 464
 465    if (qmask == 0) {
 466       /* TRANSLATORS: A "quantity" is something measured like "LENGTH",
 467        * "BEARING", "ALTITUDE", etc. */
 468       compile_diagnostic(DIAG_ERR|DIAG_BUF|DIAG_SKIP, /*Unknown quantity “%s”*/34, buffer);
 469    } else {
 470       set_pos(&fp);
 471    }
 472
 473    return qmask;
 474 }
 475
 476 #define SPECIAL_UNKNOWN 0
 477 static void
 478 cmd_set(void)
 479 {
 480    static const sztok chartab[] = {
 481         {"BLANK",     SPECIAL_BLANK },
 482 /*FIXME {"CLOSE",     SPECIAL_CLOSE }, */
 483         {"COMMENT",   SPECIAL_COMMENT },
 484         {"DECIMAL",   SPECIAL_DECIMAL },
 485         {"EOL",       SPECIAL_EOL }, /* EOL won't work well */
 486         {"KEYWORD",   SPECIAL_KEYWORD },
 487         {"MINUS",     SPECIAL_MINUS },
 488         {"NAMES",     SPECIAL_NAMES },
 489         {"OMIT",      SPECIAL_OMIT },
 490 /*FIXME {"OPEN",      SPECIAL_OPEN }, */
 491         {"PLUS",      SPECIAL_PLUS },
 492 #ifndef NO_DEPRECATED
 493         {"ROOT",      SPECIAL_ROOT },
 494 #endif
 495         {"SEPARATOR", SPECIAL_SEPARATOR },
 496         {NULL,        SPECIAL_UNKNOWN }
 497    };
 498    int mask;
 499    int i;
 500
 501    get_token();
 502    mask = match_tok(chartab, TABSIZE(chartab));
 503
 504    if (mask == SPECIAL_UNKNOWN) {
 505       compile_diagnostic(DIAG_ERR|DIAG_BUF|DIAG_SKIP, /*Unknown character class “%s”*/42, buffer);
 506       return;
 507    }
 508
 509 #ifndef NO_DEPRECATED
 510    if (mask == SPECIAL_ROOT) {
 511       if (root_depr_count < 5) {
 512          /* TRANSLATORS: Use of the ROOT character (which is "\" by default) is
 513           * deprecated, so this error would be generated by:
 514           *
 515           * *equate \foo.7 1
 516           *
 517           * If you're unsure what "deprecated" means, see:
 518           * https://en.wikipedia.org/wiki/Deprecation */
 519          compile_diagnostic(DIAG_WARN|DIAG_BUF, /*ROOT is deprecated*/25);
 520          if (++root_depr_count == 5)
 521              /* TRANSLATORS: If you're unsure what "deprecated" means, see:
 522               * https://en.wikipedia.org/wiki/Deprecation */
 523             compile_diagnostic(DIAG_WARN, /*Further uses of this deprecated feature will not be reported*/95);
 524       }
 525    }
 526 #endif
 527
 528    /* if we're currently using an inherited translation table, allocate a new
 529     * table, and copy old one into it */
 530    if (pcs->next && pcs->next->Translate == pcs->Translate) {
 531       short *p;
 532       p = ((short*)osmalloc(ossizeof(short) * 257)) + 1;
 533       memcpy(p - 1, pcs->Translate - 1, sizeof(short) * 257);
 534       pcs->Translate = p;
 535    }
 536
 537    skipblanks();
 538
 539    /* clear this flag for all non-alphanums */
 540    for (i = 0; i < 256; i++)
 541       if (!isalnum(i)) pcs->Translate[i] &= ~mask;
 542
 543    /* now set this flag for all specified chars */
 544    while (!isEol(ch)) {
 545       if (!isalnum(ch)) {
 546          pcs->Translate[ch] |= mask;
 547       } else if (tolower(ch) == 'x') {
 548          int hex;
 549          filepos fp;
 550          get_pos(&fp);
 551          nextch();
 552          if (!isxdigit(ch)) {
 553             set_pos(&fp);
 554             break;
 555          }
 556          hex = isdigit(ch) ? ch - '0' : tolower(ch) - 'a';
 557          nextch();
 558          if (!isxdigit(ch)) {
 559             set_pos(&fp);
 560             break;
 561          }
 562          hex = hex << 4 | (isdigit(ch) ? ch - '0' : tolower(ch) - 'a');
 563          pcs->Translate[hex] |= mask;
 564       } else {
 565          break;
 566       }
 567       nextch();
 568    }
 569 }
 570
 571 static void
 572 check_reentry(prefix *survey, const filepos* fpos_ptr)
 573 {
 574    /* Don't try to check "*prefix \" or "*begin \" */
 575    if (!survey->up) return;
 576    if (TSTBIT(survey->sflags, SFLAGS_PREFIX_ENTERED)) {
 577       static int reenter_depr_count = 0;
 578       filepos fp_tmp;
 579
 580       if (reenter_depr_count >= 5)
 581          return;
 582
 583       get_pos(&fp_tmp);
 584       set_pos(fpos_ptr);
 585       /* TRANSLATORS: The first of two warnings given when a survey which has
 586        * already been completed is reentered.  This example file crawl.svx:
 587        *
 588        * *begin crawl     ; <- second warning here
 589        * 1 2 9.45 234 -01
 590        * *end crawl
 591        * *begin crawl     ; <- first warning here
 592        * 2 3 7.67 223 -03
 593        * *end crawl
 594        *
 595        * Would lead to:
 596        *
 597        * crawl.svx:4: Reentering an existing survey is deprecated
 598        * crawl.svx:1: Originally entered here
 599        *
 600        * If you're unsure what "deprecated" means, see:
 601        * https://en.wikipedia.org/wiki/Deprecation */
 602       compile_diagnostic(DIAG_WARN|DIAG_TOKEN, /*Reentering an existing survey is deprecated*/29);
 603       set_pos(&fp_tmp);
 604       /* TRANSLATORS: The second of two warnings given when a survey which has
 605        * already been completed is reentered.  This example file crawl.svx:
 606        *
 607        * *begin crawl
 608        * 1 2 9.45 234 -01 # <- second warning here
 609        * *end crawl
 610        * *begin crawl     # <- first warning here
 611        * 2 3 7.67 223 -03
 612        * *end crawl
 613        *
 614        * Would lead to:
 615        *
 616        * crawl.svx:3: Reentering an existing survey is deprecated
 617        * crawl.svx:1: Originally entered here
 618        *
 619        * If you're unsure what "deprecated" means, see:
 620        * https://en.wikipedia.org/wiki/Deprecation */
 621       compile_diagnostic_pfx(DIAG_WARN, survey, /*Originally entered here*/30);
 622       if (++reenter_depr_count == 5) {
 623          /* After we've warned about 5 uses of the same deprecated feature, we
 624           * give up for the rest of the current processing run.
 625           *
 626           * If you're unsure what "deprecated" means, see:
 627           * https://en.wikipedia.org/wiki/Deprecation */
 628          compile_diagnostic(DIAG_WARN, /*Further uses of this deprecated feature will not be reported*/95);
 629       }
 630    } else {
 631       survey->sflags |= BIT(SFLAGS_PREFIX_ENTERED);
 632       survey->filename = file.filename;
 633       survey->line = file.line;
 634    }
 635 }
 636
 637 #ifndef NO_DEPRECATED
 638 static void
 639 cmd_prefix(void)
 640 {
 641    static int prefix_depr_count = 0;
 642    prefix *survey;
 643    filepos fp;
 644    /* Issue warning first, so "*prefix \" warns first that *prefix is
 645     * deprecated and then that ROOT is...
 646     */
 647    if (prefix_depr_count < 5) {
 648       /* TRANSLATORS: If you're unsure what "deprecated" means, see:
 649        * https://en.wikipedia.org/wiki/Deprecation */
 650       compile_diagnostic(DIAG_WARN|DIAG_BUF, /**prefix is deprecated - use *begin and *end instead*/6);
 651       if (++prefix_depr_count == 5)
 652          compile_diagnostic(DIAG_WARN, /*Further uses of this deprecated feature will not be reported*/95);
 653    }
 654    get_pos(&fp);
 655    survey = read_prefix(PFX_SURVEY|PFX_ALLOW_ROOT);
 656    pcs->Prefix = survey;
 657    check_reentry(survey, &fp);
 658 }
 659 #endif
 660
 661 static void
 662 cmd_alias(void)
 663 {
 664    /* Currently only two forms are supported:
 665     * *alias station - ..
 666     * *alias station -
 667     */
 668    get_token();
 669    if (strcmp(ucbuffer, "STATION") != 0)
 670       goto bad;
 671    get_word();
 672    if (strcmp(buffer, "-") != 0)
 673       goto bad;
 674    get_word();
 675    if (*buffer && strcmp(buffer, "..") != 0)
 676       goto bad;
 677    pcs->dash_for_anon_wall_station = (*buffer != '\0');
 678    return;
 679 bad:
 680    compile_diagnostic(DIAG_ERR|DIAG_SKIP, /*Bad *alias command*/397);
 681 }
 682
 683 static void
 684 cmd_begin(void)
 685 {
 686    settings *pcsNew;
 687
 688    pcsNew = osnew(settings);
 689    *pcsNew = *pcs; /* copy contents */
 690    pcsNew->begin_lineno = file.line;
 691    pcsNew->next = pcs;
 692    pcs = pcsNew;
 693
 694    skipblanks();
 695    pcs->begin_survey = NULL;
 696    if (!isEol(ch) && !isComm(ch)) {
 697       filepos fp;
 698       prefix *survey;
 699       get_pos(&fp);
 700       survey = read_prefix(PFX_SURVEY|PFX_ALLOW_ROOT|PFX_WARN_SEPARATOR);
 701       pcs->begin_survey = survey;
 702       pcs->Prefix = survey;
 703       check_reentry(survey, &fp);
 704       f_export_ok = fTrue;
 705    }
 706 }
 707
 708 extern void
 709 free_settings(settings *p) {
 710    /* don't free default ordering or ordering used by parent */
 711    const reading *order = p->ordering;
 712    if (order != default_order && (!p->next || order != p->next->ordering))
 713       osfree((reading*)order);
 714
 715    /* free Translate if not used by parent */
 716    if (!p->next || p->Translate != p->next->Translate)
 717       osfree(p->Translate - 1);
 718
 719    /* free meta if not used by parent, or in this block */
 720    if (p->meta && (!p->next || p->meta != p->next->meta) && p->meta->ref_count == 0)
 721        osfree(p->meta);
 722
 723    /* free proj_str if not used by parent, or as the output projection */
 724    if (p->proj_str &&
 725        (!p->next || p->proj_str != p->next->proj_str) &&
 726        p->proj_str != proj_str_out) {
 727        osfree(p->proj_str);
 728    }
 729
 730    osfree(p);
 731 }
 732
 733 static void
 734 cmd_end(void)
 735 {
 736    settings *pcsParent;
 737    prefix *survey, *begin_survey;
 738    filepos fp;
 739
 740    pcsParent = pcs->next;
 741
 742    if (pcs->begin_lineno == 0) {
 743       if (pcsParent == NULL) {
 744          /* more ENDs than BEGINs */
 745          compile_diagnostic(DIAG_ERR|DIAG_SKIP, /*No matching BEGIN*/192);
 746       } else {
 747          compile_diagnostic(DIAG_ERR|DIAG_SKIP, /*END with no matching BEGIN in this file*/22);
 748       }
 749       return;
 750    }
 751
 752    begin_survey = pcs->begin_survey;
 753
 754    SVX_ASSERT(pcsParent);
 755    free_settings(pcs);
 756    pcs = pcsParent;
 757
 758    /* note need to read using root *before* BEGIN */
 759    skipblanks();
 760    if (isEol(ch) || isComm(ch)) {
 761       survey = NULL;
 762    } else {
 763       get_pos(&fp);
 764       survey = read_prefix(PFX_SURVEY|PFX_ALLOW_ROOT);
 765    }
 766
 767    if (survey != begin_survey) {
 768       if (survey) {
 769          set_pos(&fp);
 770          if (!begin_survey) {
 771             /* TRANSLATORS: Used when a BEGIN command has no survey, but the
 772              * END command does, e.g.:
 773              *
 774              * *begin
 775              * 1 2 10.00 178 -01
 776              * *end entrance      <--[Message given here] */
 777             compile_diagnostic(DIAG_ERR|DIAG_TOKEN, /*Matching BEGIN command has no survey name*/36);
 778          } else {
 779             /* TRANSLATORS: *BEGIN <survey> and *END <survey> should have the
 780              * same <survey> if it’s given at all */
 781             compile_diagnostic(DIAG_ERR|DIAG_TOKEN, /*Survey name doesn’t match BEGIN*/193);
 782          }
 783          skipline();
 784       } else {
 785          /* TRANSLATORS: Used when a BEGIN command has a survey name, but the
 786           * END command omits it, e.g.:
 787           *
 788           * *begin entrance
 789           * 1 2 10.00 178 -01
 790           * *end     <--[Message given here] */
 791          compile_diagnostic(DIAG_WARN|DIAG_COL, /*Survey name omitted from END*/194);
 792       }
 793    }
 794 }
 795
 796 static void
 797 cmd_entrance(void)
 798 {
 799    prefix *pfx = read_prefix(PFX_STATION);
 800    pfx->sflags |= BIT(SFLAGS_ENTRANCE);
 801 }
 802
 803 static const prefix * first_fix_name = NULL;
 804 static const char * first_fix_filename;
 805 static unsigned first_fix_line;
 806
 807 static void
 808 cmd_fix(void)
 809 {
 810    prefix *fix_name;
 811    node *stn = NULL;
 812    static prefix *name_omit_already = NULL;
 813    static const char * name_omit_already_filename = NULL;
 814    static unsigned int name_omit_already_line;
 815    real x, y, z;
 816    filepos fp;
 817
 818    fix_name = read_prefix(PFX_STATION|PFX_ALLOW_ROOT);
 819    fix_name->sflags |= BIT(SFLAGS_FIXED);
 820
 821    get_pos(&fp);
 822    get_token();
 823    if (strcmp(ucbuffer, "REFERENCE") == 0) {
 824       /* suppress "unused fixed point" warnings for this station */
 825       fix_name->sflags |= BIT(SFLAGS_USED);
 826    } else {
 827       if (*ucbuffer) set_pos(&fp);
 828    }
 829
 830    x = read_numeric(fTrue);
 831    if (x == HUGE_REAL) {
 832       /* If the end of the line isn't blank, read a number after all to
 833        * get a more helpful error message */
 834       if (!isEol(ch) && !isComm(ch)) x = read_numeric(fFalse);
 835    }
 836    if (x == HUGE_REAL) {
 837       if (pcs->proj_str || proj_str_out) {
 838          compile_diagnostic(DIAG_ERR|DIAG_COL|DIAG_SKIP, /*Coordinates can't be omitted when coordinate system has been specified*/439);
 839          return;
 840       }
 841
 842       if (fix_name == name_omit_already) {
 843          compile_diagnostic(DIAG_WARN|DIAG_COL, /*Same station fixed twice with no coordinates*/61);
 844          return;
 845       }
 846
 847       /* TRANSLATORS: " *fix a " gives this message: */
 848       compile_diagnostic(DIAG_WARN|DIAG_COL, /*FIX command with no coordinates - fixing at (0,0,0)*/54);
 849
 850       if (name_omit_already) {
 851          /* TRANSLATORS: Emitted after second and subsequent "FIX command with
 852           * no coordinates - fixing at (0,0,0)" warnings.
 853           */
 854          compile_diagnostic_at(DIAG_ERR|DIAG_COL,
 855                                name_omit_already_filename,
 856                                name_omit_already_line,
 857                                /*Already had FIX command with no coordinates for station “%s”*/441,
 858                                sprint_prefix(name_omit_already));
 859       } else {
 860          name_omit_already = fix_name;
 861          name_omit_already_filename = file.filename;
 862          name_omit_already_line = file.line;
 863       }
 864
 865       x = y = z = (real)0.0;
 866    } else {
 867       real sdx;
 868       y = read_numeric(fFalse);
 869       z = read_numeric(fFalse);
 870
 871       if (pcs->proj_str && proj_str_out) {
 872          PJ *transform = proj_create_crs_to_crs(PJ_DEFAULT_CTX,
 873                                                 pcs->proj_str,
 874                                                 proj_str_out,
 875                                                 NULL);
 876          if (transform) {
 877             // Normalise the output order so x is longitude and y latitude - by
 878             // default new PROJ has them switched for EPSG:4326 which just seems
 879             // confusing.
 880             PJ* pj_norm = proj_normalize_for_visualization(PJ_DEFAULT_CTX,
 881                                                            transform);
 882             proj_destroy(transform);
 883             transform = pj_norm;
 884          }
 885
 886          if (proj_angular_input(transform, PJ_FWD)) {
 887             /* Input coordinate system expects radians. */
 888             x = rad(x);
 889             y = rad(y);
 890          }
 891
 892          PJ_COORD coord = {{x, y, z, HUGE_VAL}};
 893          coord = proj_trans(transform, PJ_FWD, coord);
 894          x = coord.xyzt.x;
 895          y = coord.xyzt.y;
 896          z = coord.xyzt.z;
 897
 898          if (x == HUGE_VAL || y == HUGE_VAL || z == HUGE_VAL) {
 899             compile_diagnostic(DIAG_ERR, /*Failed to convert coordinates: %s*/436,
 900                                proj_errno_string(proj_errno(transform)));
 901             // Set dummy values which are finite.
 902             x = y = z = 0;
 903          }
 904          proj_destroy(transform);
 905       } else if (pcs->proj_str) {
 906          compile_diagnostic(DIAG_ERR, /*The input projection is set but the output projection isn't*/437);
 907       } else if (proj_str_out) {
 908          compile_diagnostic(DIAG_ERR, /*The output projection is set but the input projection isn't*/438);
 909       }
 910
 911       get_pos(&fp);
 912       sdx = read_numeric(fTrue);
 913       if (sdx <= 0) {
 914           set_pos(&fp);
 915           compile_diagnostic(DIAG_ERR|DIAG_SKIP|DIAG_NUM, /*Standard deviation must be positive*/48);
 916           return;
 917       }
 918       if (sdx != HUGE_REAL) {
 919          real sdy, sdz;
 920          real cxy = 0, cyz = 0, czx = 0;
 921          get_pos(&fp);
 922          sdy = read_numeric(fTrue);
 923          if (sdy == HUGE_REAL) {
 924             /* only one variance given */
 925             sdy = sdz = sdx;
 926          } else {
 927             if (sdy <= 0) {
 928                set_pos(&fp);
 929                compile_diagnostic(DIAG_ERR|DIAG_SKIP|DIAG_NUM, /*Standard deviation must be positive*/48);
 930                return;
 931             }
 932             get_pos(&fp);
 933             sdz = read_numeric(fTrue);
 934             if (sdz == HUGE_REAL) {
 935                /* two variances given - horizontal & vertical */
 936                sdz = sdy;
 937                sdy = sdx;
 938             } else {
 939                if (sdz <= 0) {
 940                   set_pos(&fp);
 941                   compile_diagnostic(DIAG_ERR|DIAG_SKIP|DIAG_NUM, /*Standard deviation must be positive*/48);
 942                   return;
 943                }
 944                cxy = read_numeric(fTrue);
 945                if (cxy != HUGE_REAL) {
 946                   /* covariances given */
 947                   cyz = read_numeric(fFalse);
 948                   czx = read_numeric(fFalse);
 949                } else {
 950                   cxy = 0;
 951                }
 952             }
 953          }
 954          stn = StnFromPfx(fix_name);
 955          if (!fixed(stn)) {
 956             node *fixpt = osnew(node);
 957             prefix *name;
 958             name = osnew(prefix);
 959             name->pos = osnew(pos);
 960             name->ident = NULL;
 961             name->shape = 0;
 962             fixpt->name = name;
 963             name->stn = fixpt;
 964             name->up = NULL;
 965             if (TSTBIT(pcs->infer, INFER_EXPORTS)) {
 966                name->min_export = USHRT_MAX;
 967             } else {
 968                name->min_export = 0;
 969             }
 970             name->max_export = 0;
 971             name->sflags = 0;
 972             add_stn_to_list(&stnlist, fixpt);
 973             POS(fixpt, 0) = x;
 974             POS(fixpt, 1) = y;
 975             POS(fixpt, 2) = z;
 976             fix(fixpt);
 977             fixpt->leg[0] = fixpt->leg[1] = fixpt->leg[2] = NULL;
 978             addfakeleg(fixpt, stn, 0, 0, 0,
 979                        sdx * sdx, sdy * sdy, sdz * sdz
 980 #ifndef NO_COVARIANCES
 981                        , cxy, cyz, czx
 982 #endif
 983                        );
 984          }
 985
 986          if (!first_fix_name) {
 987             /* We track if we've fixed a station yet, and if so what the name
 988              * of the first fix was, so that we can issue an error if the
 989              * output coordinate system is set after fixing a station. */
 990             first_fix_name = fix_name;
 991             first_fix_filename = file.filename;
 992             first_fix_line = file.line;
 993          }
 994
 995          return;
 996       }
 997    }
 998
 999    if (!first_fix_name) {
1000       /* We track if we've fixed a station yet, and if so what the name of the
1001        * first fix was, so that we can issue an error if the output coordinate
1002        * system is set after fixing a station. */
1003       first_fix_name = fix_name;
1004       first_fix_filename = file.filename;
1005       first_fix_line = file.line;
1006    }
1007
1008    stn = StnFromPfx(fix_name);
1009    if (!fixed(stn)) {
1010       POS(stn, 0) = x;
1011       POS(stn, 1) = y;
1012       POS(stn, 2) = z;
1013       fix(stn);
1014       return;
1015    }
1016
1017    if (x != POS(stn, 0) || y != POS(stn, 1) || z != POS(stn, 2)) {
1018       compile_diagnostic(DIAG_ERR, /*Station already fixed or equated to a fixed point*/46);
1019       return;
1020    }
1021    /* TRANSLATORS: *fix a 1 2 3 / *fix a 1 2 3 */
1022    compile_diagnostic(DIAG_WARN, /*Station already fixed at the same coordinates*/55);
1023 }
1024
1025 static void
1026 cmd_flags(void)
1027 {
1028    static const sztok flagtab[] = {
1029         {"DUPLICATE", FLAGS_DUPLICATE },
1030         {"NOT",       FLAGS_NOT },
1031         {"SPLAY",     FLAGS_SPLAY },
1032         {"SURFACE",   FLAGS_SURFACE },
1033         {NULL,        FLAGS_UNKNOWN }
1034    };
1035    bool fNot = fFalse;
1036    bool fEmpty = fTrue;
1037    while (1) {
1038       int flag;
1039       get_token();
1040       /* If buffer is empty, it could mean end of line, or maybe
1041        * some non-letter junk which is better reported later */
1042       if (!buffer[0]) break;
1043
1044       fEmpty = fFalse;
1045       flag = match_tok(flagtab, TABSIZE(flagtab));
1046       /* treat the second NOT in "NOT NOT" as an unknown flag */
1047       if (flag == FLAGS_UNKNOWN || (fNot && flag == FLAGS_NOT)) {
1048          compile_diagnostic(DIAG_ERR|DIAG_BUF, /*FLAG “%s” unknown*/68, buffer);
1049          /* Recover from “*FLAGS NOT BOGUS SURFACE” by ignoring "NOT BOGUS" */
1050          fNot = fFalse;
1051       } else if (flag == FLAGS_NOT) {
1052          fNot = fTrue;
1053       } else if (fNot) {
1054          pcs->flags &= ~BIT(flag);
1055          fNot = fFalse;
1056       } else {
1057          pcs->flags |= BIT(flag);
1058       }
1059    }
1060
1061    if (fNot) {
1062       compile_diagnostic(DIAG_ERR|DIAG_BUF, /*Expecting “DUPLICATE”, “SPLAY”, or “SURFACE”*/188);
1063    } else if (fEmpty) {
1064       compile_diagnostic(DIAG_ERR|DIAG_BUF, /*Expecting “NOT”, “DUPLICATE”, “SPLAY”, or “SURFACE”*/189);
1065    }
1066 }
1067
1068 static void
1069 cmd_equate(void)
1070 {
1071    prefix *name1, *name2;
1072    bool fOnlyOneStn = fTrue; /* to trap eg *equate entrance.6 */
1073    filepos fp;
1074
1075    get_pos(&fp);
1076    name1 = read_prefix(PFX_STATION|PFX_ALLOW_ROOT|PFX_SUSPECT_TYPO);
1077    while (fTrue) {
1078       name2 = name1;
1079       skipblanks();
1080       if (isEol(ch) || isComm(ch)) {
1081          if (fOnlyOneStn) {
1082             set_pos(&fp);
1083             /* TRANSLATORS: EQUATE is a command name, so shouldn’t be
1084              * translated.
1085              *
1086              * Here "station" is a survey station, not a train station.
1087              */
1088             compile_diagnostic(DIAG_ERR|DIAG_SKIP|DIAG_TOKEN, /*Only one station in EQUATE command*/33);
1089          }
1090          return;
1091       }
1092
1093       name1 = read_prefix(PFX_STATION|PFX_ALLOW_ROOT|PFX_SUSPECT_TYPO);
1094       process_equate(name1, name2);
1095       fOnlyOneStn = fFalse;
1096    }
1097 }
1098
1099 static void
1100 report_missing_export(prefix *pfx, int depth)
1101 {
1102    char *s;
1103    const char *p;
1104    prefix *survey = pfx;
1105    int i;
1106    for (i = depth + 1; i; i--) {
1107       survey = survey->up;
1108       SVX_ASSERT(survey);
1109    }
1110    s = osstrdup(sprint_prefix(survey));
1111    p = sprint_prefix(pfx);
1112    if (survey->filename) {
1113       /* TRANSLATORS: A station must be exported out of each level it is in, so
1114        * this would give "Station “\outer.inner.1” not exported from survey
1115        * “\outer”)":
1116        *
1117        * *equate entrance outer.inner.1
1118        * *begin outer
1119        * *begin inner
1120        * *export 1
1121        * 1 2 1.23 045 -6
1122        * *end inner
1123        * *end outer
1124        *
1125        * Here "survey" is a "cave map" rather than list of questions - it should be
1126        * translated to the terminology that cavers using the language would use.
1127        */
1128       compile_diagnostic_pfx(DIAG_ERR, survey,
1129                              /*Station “%s” not exported from survey “%s”*/26, p, s);
1130    } else {
1131       compile_diagnostic(DIAG_ERR, /*Station “%s” not exported from survey “%s”*/26, p, s);
1132    }
1133    osfree(s);
1134 }
1135
1136 static void
1137 cmd_export(void)
1138 {
1139    prefix *pfx;
1140
1141    fExportUsed = fTrue;
1142    do {
1143       int depth = 0;
1144       pfx = read_prefix(PFX_STATION|PFX_NEW);
1145       if (pfx == NULL) {
1146          /* The argument was an existing station. */
1147          /* FIXME */
1148       } else {
1149          prefix *p = pfx;
1150          while (p != NULL && p != pcs->Prefix) {
1151             depth++;
1152             p = p->up;
1153          }
1154          /* Something like: *export \foo, but we've excluded use of root */
1155          SVX_ASSERT(p);
1156       }
1157       /* *export \ or similar bogus stuff */
1158       SVX_ASSERT(depth);
1159 #if 0
1160       printf("C min %d max %d depth %d pfx %s\n",
1161              pfx->min_export, pfx->max_export, depth, sprint_prefix(pfx));
1162 #endif
1163       if (pfx->min_export == 0) {
1164          /* not encountered *export for this name before */
1165          if (pfx->max_export > depth) report_missing_export(pfx, depth);
1166          pfx->min_export = pfx->max_export = depth;
1167       } else if (pfx->min_export != USHRT_MAX) {
1168          /* FIXME: what to do if a station is marked for inferred exports
1169           * but is then explicitly exported?  Currently we just ignore the
1170           * explicit export... */
1171          if (pfx->min_export - 1 > depth) {
1172             report_missing_export(pfx, depth);
1173          } else if (pfx->min_export - 1 < depth) {
1174             /* TRANSLATORS: Here "station" is a survey station, not a train station.
1175              *
1176              * Exporting a station twice gives this error:
1177              *
1178              * *begin example
1179              * *export 1
1180              * *export 1
1181              * 1 2 1.24 045 -6
1182              * *end example */
1183             compile_diagnostic(DIAG_ERR, /*Station “%s” already exported*/66,
1184                                sprint_prefix(pfx));
1185          }
1186          pfx->min_export = depth;
1187       }
1188       skipblanks();
1189    } while (!isEol(ch) && !isComm(ch));
1190 }
1191
1192 static void
1193 cmd_data(void)
1194 {
1195    static const sztok dtab[] = {
1196         {"ALTITUDE",     Dz },
1197         {"BACKBEARING",  BackComp },
1198         {"BACKCLINO",    BackClino }, /* alternative name */
1199         {"BACKCOMPASS",  BackComp }, /* alternative name */
1200         {"BACKGRADIENT", BackClino },
1201         {"BACKLENGTH",   BackTape },
1202         {"BACKTAPE",     BackTape }, /* alternative name */
1203         {"BEARING",      Comp },
1204         {"CEILING",      Up }, /* alternative name */
1205         {"CLINO",        Clino }, /* alternative name */
1206         {"COMPASS",      Comp }, /* alternative name */
1207         {"COUNT",        Count }, /* FrCount&ToCount in multiline */
1208         {"DEPTH",        Depth }, /* FrDepth&ToDepth in multiline */
1209         {"DEPTHCHANGE",  DepthChange },
1210         {"DIRECTION",    Dir },
1211         {"DOWN",         Down },
1212         {"DX",           Dx },
1213         {"DY",           Dy },
1214         {"DZ",           Dz },
1215         {"EASTING",      Dx },
1216         {"FLOOR",        Down }, /* alternative name */
1217         {"FROM",         Fr },
1218         {"FROMCOUNT",    FrCount },
1219         {"FROMDEPTH",    FrDepth },
1220         {"GRADIENT",     Clino },
1221         {"IGNORE",       Ignore },
1222         {"IGNOREALL",    IgnoreAll },
1223         {"LEFT",         Left },
1224         {"LENGTH",       Tape },
1225         {"NEWLINE",      Newline },
1226         {"NORTHING",     Dy },
1227         {"RIGHT",        Right },
1228         {"STATION",      Station }, /* Fr&To in multiline */
1229         {"TAPE",         Tape }, /* alternative name */
1230         {"TO",           To },
1231         {"TOCOUNT",      ToCount },
1232         {"TODEPTH",      ToDepth },
1233         {"UP",           Up },
1234         {NULL,           End }
1235    };
1236
1237 #define MASK_stns BIT(Fr) | BIT(To) | BIT(Station)
1238 #define MASK_tape BIT(Tape) | BIT(BackTape) | BIT(FrCount) | BIT(ToCount) | BIT(Count)
1239 #define MASK_dpth BIT(FrDepth) | BIT(ToDepth) | BIT(Depth) | BIT(DepthChange)
1240 #define MASK_comp BIT(Comp) | BIT(BackComp)
1241 #define MASK_clin BIT(Clino) | BIT(BackClino)
1242
1243 #define MASK_NORMAL MASK_stns | BIT(Dir) | MASK_tape | MASK_comp | MASK_clin
1244 #define MASK_DIVING MASK_NORMAL | MASK_dpth
1245 #define MASK_CARTESIAN MASK_stns | BIT(Dx) | BIT(Dy) | BIT(Dz)
1246 #define MASK_CYLPOLAR  MASK_stns | BIT(Dir) | MASK_tape | MASK_comp | MASK_dpth
1247 #define MASK_NOSURVEY MASK_stns
1248 #define MASK_PASSAGE BIT(Station) | BIT(Left) | BIT(Right) | BIT(Up) | BIT(Down)
1249
1250    /* readings which may be given for each style */
1251    static const unsigned long mask[] = {
1252       MASK_NORMAL, MASK_DIVING, MASK_CARTESIAN, MASK_CYLPOLAR, MASK_NOSURVEY,
1253       MASK_PASSAGE
1254    };
1255
1256    /* readings which may be omitted for each style */
1257    static const unsigned long mask_optional[] = {
1258       BIT(Dir) | BIT(Clino) | BIT(BackClino),
1259       BIT(Dir) | BIT(Clino) | BIT(BackClino),
1260       0,
1261       BIT(Dir),
1262       0,
1263       0 /* BIT(Left) | BIT(Right) | BIT(Up) | BIT(Down), */
1264    };
1265
1266    /* all valid readings */
1267    static const unsigned long mask_all[] = {
1268       MASK_NORMAL | BIT(Newline) | BIT(Ignore) | BIT(IgnoreAll) | BIT(End),
1269       MASK_DIVING | BIT(Newline) | BIT(Ignore) | BIT(IgnoreAll) | BIT(End),
1270       MASK_CARTESIAN | BIT(Newline) | BIT(Ignore) | BIT(IgnoreAll) | BIT(End),
1271       MASK_CYLPOLAR | BIT(Newline) | BIT(Ignore) | BIT(IgnoreAll) | BIT(End),
1272       MASK_NOSURVEY | BIT(Ignore) | BIT(IgnoreAll) | BIT(End),
1273       MASK_PASSAGE | BIT(Ignore) | BIT(IgnoreAll) | BIT(End)
1274    };
1275 #define STYLE_DEFAULT   -2
1276 #define STYLE_UNKNOWN   -1
1277
1278    static const sztok styletab[] = {
1279         {"CARTESIAN",    STYLE_CARTESIAN },
1280         {"CYLPOLAR",     STYLE_CYLPOLAR },
1281         {"DEFAULT",      STYLE_DEFAULT },
1282         {"DIVING",       STYLE_DIVING },
1283         {"NORMAL",       STYLE_NORMAL },
1284         {"NOSURVEY",     STYLE_NOSURVEY },
1285         {"PASSAGE",      STYLE_PASSAGE },
1286         {"TOPOFIL",      STYLE_NORMAL },
1287         {NULL,           STYLE_UNKNOWN }
1288    };
1289
1290 #define m_multi (BIT(Station) | BIT(Count) | BIT(Depth))
1291
1292    int style, k = 0;
1293    reading d;
1294    unsigned long mUsed = 0;
1295    int old_style = pcs->style;
1296
1297    /* after a bad *data command ignore survey data until the next
1298     * *data command to avoid an avalanche of errors */
1299    pcs->style = STYLE_IGNORE;
1300
1301    get_token();
1302    style = match_tok(styletab, TABSIZE(styletab));
1303
1304    if (style == STYLE_DEFAULT) {
1305       default_style(pcs);
1306       return;
1307    }
1308
1309    if (style == STYLE_UNKNOWN) {
1310       if (!buffer[0]) {
1311          /* "*data" reinitialises the current style - for *data passage that
1312           * breaks the passage.
1313           */
1314          pcs->style = style = old_style;
1315          goto reinit_style;
1316       }
1317       /* TRANSLATORS: e.g. trying to refer to an invalid FNORD data style */
1318       compile_diagnostic(DIAG_ERR|DIAG_BUF|DIAG_SKIP, /*Data style “%s” unknown*/65, buffer);
1319       return;
1320    }
1321
1322    skipblanks();
1323 #ifndef NO_DEPRECATED
1324    /* Olde syntax had optional field for survey grade, so allow an omit
1325     * but issue a warning about it */
1326    if (isOmit(ch)) {
1327       static int data_depr_count = 0;
1328       if (data_depr_count < 5) {
1329          compile_diagnostic(DIAG_WARN|DIAG_BUF, /*“*data %s %c …” is deprecated - use “*data %s …” instead*/104,
1330                             buffer, ch, buffer);
1331          if (++data_depr_count == 5)
1332             compile_diagnostic(DIAG_WARN, /*Further uses of this deprecated feature will not be reported*/95);
1333       }
1334       nextch();
1335    }
1336 #endif
1337
1338    int kMac = 6; /* minimum for NORMAL style */
1339    reading *new_order = osmalloc(kMac * sizeof(reading));
1340    char *style_name = osstrdup(buffer);
1341    do {
1342       filepos fp;
1343       get_pos(&fp);
1344       get_token();
1345       d = match_tok(dtab, TABSIZE(dtab));
1346       /* only token allowed after IGNOREALL is NEWLINE */
1347       if (k && new_order[k - 1] == IgnoreAll && d != Newline) {
1348          set_pos(&fp);
1349          break;
1350       }
1351       /* Note: an unknown token is reported as trailing garbage */
1352       if (!TSTBIT(mask_all[style], d)) {
1353          /* TRANSLATORS: a data "style" is something like NORMAL, DIVING, etc.
1354           * a "reading" is one of FROM, TO, TAPE, COMPASS, CLINO for NORMAL
1355           * neither style nor reading is a keyword in the program This error
1356           * complains about a depth gauge reading in normal style, for example
1357           */
1358          compile_diagnostic(DIAG_ERR|DIAG_BUF|DIAG_SKIP,
1359                             /*Reading “%s” not allowed in data style “%s”*/63,
1360                             buffer, style_name);
1361          osfree(style_name);
1362          osfree(new_order);
1363          return;
1364       }
1365       if (TSTBIT(mUsed, Newline) && TSTBIT(m_multi, d)) {
1366          /* TRANSLATORS: caused by e.g.
1367           *
1368           * *data diving station newline depth tape compass
1369           *
1370           * ("depth" needs to occur before "newline"). */
1371          compile_diagnostic(DIAG_ERR|DIAG_BUF|DIAG_SKIP,
1372                             /*Reading “%s” must occur before NEWLINE*/225, buffer);
1373          osfree(style_name);
1374          osfree(new_order);
1375          return;
1376       }
1377       /* Check for duplicates unless it's a special reading:
1378        *   IGNOREALL,IGNORE (duplicates allowed) ; END (not possible)
1379        */
1380       if (!((BIT(Ignore) | BIT(End) | BIT(IgnoreAll)) & BIT(d))) {
1381          if (TSTBIT(mUsed, d)) {
1382             /* TRANSLATORS: complains about a situation like trying to define
1383              * two from stations per leg */
1384             compile_diagnostic(DIAG_ERR|DIAG_BUF|DIAG_SKIP, /*Duplicate reading “%s”*/67, buffer);
1385             osfree(style_name);
1386             osfree(new_order);
1387             return;
1388          } else {
1389             /* Check for previously listed readings which are incompatible
1390              * with this one - e.g. Count vs FrCount */
1391             bool fBad = fFalse;
1392             switch (d) {
1393              case Station:
1394                if (mUsed & (BIT(Fr) | BIT(To))) fBad = fTrue;
1395                break;
1396              case Fr: case To:
1397                if (TSTBIT(mUsed, Station)) fBad = fTrue;
1398                break;
1399              case Count:
1400                if (mUsed & (BIT(FrCount) | BIT(ToCount) | BIT(Tape)))
1401                   fBad = fTrue;
1402                break;
1403              case FrCount: case ToCount:
1404                if (mUsed & (BIT(Count) | BIT(Tape)))
1405                   fBad = fTrue;
1406                break;
1407              case Depth:
1408                if (mUsed & (BIT(FrDepth) | BIT(ToDepth) | BIT(DepthChange)))
1409                   fBad = fTrue;
1410                break;
1411              case FrDepth: case ToDepth:
1412                if (mUsed & (BIT(Depth) | BIT(DepthChange))) fBad = fTrue;
1413                break;
1414              case DepthChange:
1415                if (mUsed & (BIT(FrDepth) | BIT(ToDepth) | BIT(Depth)))
1416                   fBad = fTrue;
1417                break;
1418              case Newline:
1419                if (mUsed & ~m_multi) {
1420                   /* TRANSLATORS: e.g.
1421                    *
1422                    * *data normal from to tape newline compass clino */
1423                   compile_diagnostic(DIAG_ERR|DIAG_BUF|DIAG_SKIP, /*NEWLINE can only be preceded by STATION, DEPTH, and COUNT*/226);
1424                   osfree(style_name);
1425                   osfree(new_order);
1426                   return;
1427                }
1428                if (k == 0) {
1429                   /* TRANSLATORS: error from:
1430                    *
1431                    * *data normal newline from to tape compass clino */
1432                   compile_diagnostic(DIAG_ERR|DIAG_BUF|DIAG_SKIP, /*NEWLINE can’t be the first reading*/222);
1433                   osfree(style_name);
1434                   osfree(new_order);
1435                   return;
1436                }
1437                break;
1438              default: /* avoid compiler warnings about unhandled enums */
1439                break;
1440             }
1441             if (fBad) {
1442                /* Not entirely happy with phrasing this... */
1443                /* TRANSLATORS: This is an error from the *DATA command.  It
1444                 * means that a reading (which will appear where %s is isn't
1445                 * valid as the list of readings has already included the same
1446                 * reading, or an equivalent one (e.g. you can't have both
1447                 * DEPTH and DEPTHCHANGE together). */
1448                compile_diagnostic(DIAG_ERR|DIAG_BUF|DIAG_SKIP, /*Reading “%s” duplicates previous reading(s)*/77,
1449                                          buffer);
1450                osfree(style_name);
1451                osfree(new_order);
1452                return;
1453             }
1454             mUsed |= BIT(d); /* used to catch duplicates */
1455          }
1456       }
1457       if (k && new_order[k - 1] == IgnoreAll) {
1458          SVX_ASSERT(d == Newline);
1459          k--;
1460          d = IgnoreAllAndNewLine;
1461       }
1462       if (k >= kMac) {
1463          kMac = kMac * 2;
1464          new_order = osrealloc(new_order, kMac * sizeof(reading));
1465       }
1466       new_order[k++] = d;
1467    } while (d != End);
1468
1469    if (k >= 2 && new_order[k - 2] == Newline) {
1470       /* TRANSLATORS: error from:
1471        *
1472        * *data normal from to tape compass clino newline */
1473       compile_diagnostic(DIAG_ERR|DIAG_BUF|DIAG_SKIP, /*NEWLINE can’t be the last reading*/223);
1474       osfree(style_name);
1475       osfree(new_order);
1476       return;
1477    }
1478
1479    if (style == STYLE_NOSURVEY) {
1480       if (TSTBIT(mUsed, Station)) {
1481          if (k >= kMac) {
1482             kMac = kMac * 2;
1483             new_order = osrealloc(new_order, kMac * sizeof(reading));
1484          }
1485          new_order[k - 1] = Newline;
1486          new_order[k++] = End;
1487       }
1488    } else if (style == STYLE_PASSAGE) {
1489       /* Station doesn't mean "multiline" for STYLE_PASSAGE. */
1490    } else if (!TSTBIT(mUsed, Newline) && (m_multi & mUsed)) {
1491       /* TRANSLATORS: Error given by something like:
1492        *
1493        * *data normal station tape compass clino
1494        *
1495        * ("station" signifies interleaved data). */
1496       compile_diagnostic(DIAG_ERR|DIAG_SKIP, /*Interleaved readings, but no NEWLINE*/224);
1497       osfree(style_name);
1498       osfree(new_order);
1499       return;
1500    }
1501
1502 #if 0
1503    printf("mUsed = 0x%x\n", mUsed);
1504 #endif
1505
1506    /* Check the supplied readings form a sufficient set. */
1507    if (style != STYLE_PASSAGE) {
1508        if ((mUsed & (BIT(Fr) | BIT(To))) == (BIT(Fr) | BIT(To)))
1509            mUsed |= BIT(Station);
1510        else if (TSTBIT(mUsed, Station))
1511            mUsed |= BIT(Fr) | BIT(To);
1512    }
1513
1514    if (mUsed & (BIT(Comp) | BIT(BackComp)))
1515       mUsed |= BIT(Comp) | BIT(BackComp);
1516
1517    if (mUsed & (BIT(Clino) | BIT(BackClino)))
1518       mUsed |= BIT(Clino) | BIT(BackClino);
1519
1520    if ((mUsed & (BIT(FrDepth) | BIT(ToDepth))) == (BIT(FrDepth) | BIT(ToDepth)))
1521       mUsed |= BIT(Depth) | BIT(DepthChange);
1522    else if (mUsed & (BIT(Depth) | BIT(DepthChange)))
1523       mUsed |= BIT(FrDepth) | BIT(ToDepth) | BIT(Depth) | BIT(DepthChange);
1524
1525    if ((mUsed & (BIT(FrCount) | BIT(ToCount))) == (BIT(FrCount) | BIT(ToCount)))
1526       mUsed |= BIT(Count) | BIT(Tape) | BIT(BackTape);
1527    else if (mUsed & (BIT(Count) | BIT(Tape) | BIT(BackTape)))
1528       mUsed |= BIT(FrCount) | BIT(ToCount) | BIT(Count) | BIT(Tape) | BIT(BackTape);
1529
1530 #if 0
1531    printf("mUsed = 0x%x, opt = 0x%x, mask = 0x%x\n", mUsed,
1532           mask_optional[style], mask[style]);
1533 #endif
1534
1535    if (((mUsed &~ BIT(Newline)) | mask_optional[style]) != mask[style]) {
1536       /* Test should only fail with too few bits set, not too many */
1537       SVX_ASSERT((((mUsed &~ BIT(Newline)) | mask_optional[style])
1538               &~ mask[style]) == 0);
1539       /* TRANSLATORS: i.e. not enough readings for the style. */
1540       compile_diagnostic(DIAG_ERR|DIAG_SKIP, /*Too few readings for data style “%s”*/64, style_name);
1541       osfree(style_name);
1542       osfree(new_order);
1543       return;
1544    }
1545
1546    /* don't free default ordering or ordering used by parent */
1547    if (pcs->ordering != default_order &&
1548        !(pcs->next && pcs->next->ordering == pcs->ordering))
1549       osfree((reading*)pcs->ordering);
1550
1551    pcs->style = style;
1552    pcs->ordering = new_order;
1553
1554    osfree(style_name);
1555
1556 reinit_style:
1557    if (style == STYLE_PASSAGE) {
1558       lrudlist * new_psg = osnew(lrudlist);
1559       new_psg->tube = NULL;
1560       new_psg->next = model;
1561       model = new_psg;
1562       next_lrud = &(new_psg->tube);
1563    }
1564 }
1565
1566 static void
1567 cmd_units(void)
1568 {
1569    int units, quantity;
1570    unsigned long qmask;
1571    unsigned long m; /* mask with bit x set to indicate quantity x specified */
1572    real factor;
1573    filepos fp;
1574
1575    qmask = get_qlist(BIT(Q_POS)|BIT(Q_PLUMB)|BIT(Q_LEVEL));
1576
1577    if (!qmask) return;
1578    if (qmask == BIT(Q_DEFAULT)) {
1579       default_units(pcs);
1580       return;
1581    }
1582
1583    get_pos(&fp);
1584    factor = read_numeric(fTrue);
1585    if (factor == 0.0) {
1586       set_pos(&fp);
1587       /* TRANSLATORS: error message given by "*units tape 0 feet" - it’s
1588        * meaningless to say your tape is marked in "0 feet" (but you might
1589        * measure distance by counting knots on a diving line, and tie them
1590        * every "2 feet"). */
1591       compile_diagnostic(DIAG_ERR|DIAG_TOKEN, /**UNITS factor must be non-zero*/200);
1592       skipline();
1593       return;
1594    }
1595
1596    units = get_units(qmask, fTrue);
1597    if (units == UNITS_NULL) return;
1598    if (TSTBIT(qmask, Q_GRADIENT))
1599       pcs->f_clino_percent = (units == UNITS_PERCENT);
1600    if (TSTBIT(qmask, Q_BACKGRADIENT))
1601       pcs->f_backclino_percent = (units == UNITS_PERCENT);
1602
1603    if (TSTBIT(qmask, Q_BEARING)) {
1604       pcs->f_bearing_quadrants = (units == UNITS_QUADRANTS);
1605    }
1606    if (TSTBIT(qmask, Q_BACKBEARING)) {
1607       pcs->f_backbearing_quadrants = (units == UNITS_QUADRANTS);
1608    }
1609
1610    if (factor == HUGE_REAL) {
1611       factor = factor_tab[units];
1612    } else {
1613       factor *= factor_tab[units];
1614    }
1615
1616    for (quantity = 0, m = BIT(quantity); m <= qmask; quantity++, m <<= 1)
1617       if (qmask & m) pcs->units[quantity] = factor;
1618 }
1619
1620 static void
1621 cmd_calibrate(void)
1622 {
1623    real sc, z;
1624    unsigned long qmask, m;
1625    int quantity;
1626    filepos fp;
1627
1628    qmask = get_qlist(BIT(Q_POS)|BIT(Q_PLUMB)|BIT(Q_LEVEL));
1629    if (!qmask) return; /* error already reported */
1630
1631    if (qmask == BIT(Q_DEFAULT)) {
1632       default_calib(pcs);
1633       return;
1634    }
1635
1636    if (((qmask & LEN_QMASK)) && ((qmask & ANG_QMASK))) {
1637       /* TRANSLATORS: e.g.
1638        *
1639        * *calibrate tape compass 1 1
1640        */
1641       compile_diagnostic(DIAG_ERR|DIAG_SKIP, /*Can’t calibrate angular and length quantities together*/227);
1642       return;
1643    }
1644
1645    z = read_numeric(fFalse);
1646    get_pos(&fp);
1647    sc = read_numeric(fTrue);
1648    if (sc == HUGE_REAL) {
1649       if (isalpha(ch)) {
1650          int units = get_units(qmask, fFalse);
1651          if (units == UNITS_NULL) {
1652             return;
1653          }
1654          z *= factor_tab[units];
1655          sc = read_numeric(fTrue);
1656          if (sc == HUGE_REAL) {
1657             sc = (real)1.0;
1658          } else {
1659             /* Adjustment applied is: (reading - z) * sc
1660              * We want: reading * sc - z
1661              * So divide z by sc so the applied adjustment does what we want.
1662              */
1663             z /= sc;
1664          }
1665       } else {
1666          sc = (real)1.0;
1667       }
1668    }
1669
1670    if (sc == HUGE_REAL) sc = (real)1.0;
1671    /* check for declination scale */
1672    if (TSTBIT(qmask, Q_DECLINATION) && sc != 1.0) {
1673       set_pos(&fp);
1674       /* TRANSLATORS: DECLINATION is a built-in keyword, so best not to
1675        * translate */
1676       compile_diagnostic(DIAG_ERR|DIAG_TOKEN, /*Scale factor must be 1.0 for DECLINATION*/40);
1677       skipline();
1678       return;
1679    }
1680    if (sc == 0.0) {
1681       set_pos(&fp);
1682       /* TRANSLATORS: If the scale factor for an instrument is zero, then any
1683        * reading would be mapped to zero, which doesn't make sense. */
1684       compile_diagnostic(DIAG_ERR|DIAG_TOKEN, /*Scale factor must be non-zero*/391);
1685       skipline();
1686       return;
1687    }
1688    for (quantity = 0, m = BIT(quantity); m <= qmask; quantity++, m <<= 1) {
1689       if (qmask & m) {
1690          pcs->z[quantity] = pcs->units[quantity] * z;
1691          pcs->sc[quantity] = sc;
1692       }
1693    }
1694 }
1695
1696 static void
1697 cmd_declination(void)
1698 {
1699     real v = read_numeric(fTrue);
1700     if (v == HUGE_REAL) {
1701         get_token_no_blanks();
1702         if (strcmp(ucbuffer, "AUTO") != 0) {
1703             compile_diagnostic(DIAG_ERR|DIAG_SKIP|DIAG_COL, /*Expected number or “AUTO”*/309);
1704             return;
1705         }
1706         /* *declination auto X Y Z */
1707         real x = read_numeric(fFalse);
1708         real y = read_numeric(fFalse);
1709         real z = read_numeric(fFalse);
1710         if (!pcs->proj_str) {
1711             compile_diagnostic(DIAG_ERR, /*Input coordinate system must be specified for “*DECLINATION AUTO”*/301);
1712             return;
1713         }
1714         /* Convert to WGS84 lat long. */
1715         PJ *transform = proj_create_crs_to_crs(PJ_DEFAULT_CTX,
1716                                                pcs->proj_str,
1717                                                WGS84_DATUM_STRING,
1718                                                NULL);
1719         if (transform) {
1720             // Normalise the output order so x is longitude and y latitude - by
1721             // default new PROJ has them switched for EPSG:4326 which just seems
1722             // confusing.
1723             PJ* pj_norm = proj_normalize_for_visualization(PJ_DEFAULT_CTX,
1724                                                            transform);
1725             proj_destroy(transform);
1726             transform = pj_norm;
1727         }
1728
1729         if (proj_angular_input(transform, PJ_FWD)) {
1730             /* Input coordinate system expects radians. */
1731             x = rad(x);
1732             y = rad(y);
1733         }
1734
1735         PJ_COORD coord = {{x, y, z, HUGE_VAL}};
1736         coord = proj_trans(transform, PJ_FWD, coord);
1737         x = coord.xyzt.x;
1738         y = coord.xyzt.y;
1739         z = coord.xyzt.z;
1740
1741         if (x == HUGE_VAL || y == HUGE_VAL || z == HUGE_VAL) {
1742            compile_diagnostic(DIAG_ERR, /*Failed to convert coordinates: %s*/436,
1743                               proj_errno_string(proj_errno(transform)));
1744            // Set dummy values which are finite.
1745            x = y = z = 0;
1746         }
1747         proj_destroy(transform);
1748         double lon = rad(x);
1749         double lat = rad(y);
1750         pcs->z[Q_DECLINATION] = HUGE_REAL;
1751         pcs->dec_lat = lat;
1752         pcs->dec_lon = lon;
1753         pcs->dec_alt = z;
1754         /* Invalidate cached declination. */
1755         pcs->declination = HUGE_REAL;
1756         {
1757             PJ *pj = proj_create(PJ_DEFAULT_CTX, proj_str_out);
1758             PJ_COORD lp;
1759             lp.lp.lam = lon;
1760             lp.lp.phi = lat;
1761 #if PROJ_VERSION_MAJOR < 8 || \
1762     (PROJ_VERSION_MAJOR == 8 && PROJ_VERSION_MINOR < 2)
1763             // Code adapted from fix in PROJ 8.2.0 to make proj_factors() work in
1764             // cases we need (e.g. a CRS specified as "EPSG:<number>").
1765             switch (proj_get_type(pj)) {
1766                 case PJ_TYPE_PROJECTED_CRS: {
1767                     // If it is a projected CRS, then compute the factors on the conversion
1768                     // associated to it. We need to start from a temporary geographic CRS
1769                     // using the same datum as the one of the projected CRS, and with
1770                     // input coordinates being in longitude, latitude order in radian,
1771                     // to be consistent with the expectations of the lp input parameter.
1772
1773                     PJ * geodetic_crs = proj_get_source_crs(PJ_DEFAULT_CTX, pj);
1774                     if (!geodetic_crs)
1775                         break;
1776                     PJ * datum = proj_crs_get_datum(PJ_DEFAULT_CTX, geodetic_crs);
1777                     PJ * datum_ensemble = proj_crs_get_datum_ensemble(PJ_DEFAULT_CTX, geodetic_crs);
1778                     PJ * cs = proj_create_ellipsoidal_2D_cs(
1779                         PJ_DEFAULT_CTX, PJ_ELLPS2D_LONGITUDE_LATITUDE, "Radian", 1.0);
1780                     PJ * temp = proj_create_geographic_crs_from_datum(
1781                         PJ_DEFAULT_CTX, "unnamed crs", datum ? datum : datum_ensemble,
1782                         cs);
1783                     proj_destroy(datum);
1784                     proj_destroy(datum_ensemble);
1785                     proj_destroy(cs);
1786                     proj_destroy(geodetic_crs);
1787                     PJ * newOp = proj_create_crs_to_crs_from_pj(PJ_DEFAULT_CTX, temp, pj, NULL, NULL);
1788                     proj_destroy(temp);
1789                     if (!newOp) {
1790                         break;
1791                     }
1792                     proj_destroy(pj);
1793                     pj = newOp;
1794                     break;
1795                 }
1796                 default:
1797                     break;
1798             }
1799 #endif
1800             PJ_FACTORS factors = proj_factors(pj, lp);
1801             pcs->convergence = factors.meridian_convergence;
1802             proj_destroy(pj);
1803         }
1804     } else {
1805         /* *declination D UNITS */
1806         int units = get_units(BIT(Q_DECLINATION), fFalse);
1807         if (units == UNITS_NULL) {
1808             return;
1809         }
1810         pcs->z[Q_DECLINATION] = -v * factor_tab[units];
1811         pcs->convergence = 0;
1812     }
1813 }
1814
1815 #ifndef NO_DEPRECATED
1816 static void
1817 cmd_default(void)
1818 {
1819    static const sztok defaulttab[] = {
1820       { "CALIBRATE", CMD_CALIBRATE },
1821       { "DATA",      CMD_DATA },
1822       { "UNITS",     CMD_UNITS },
1823       { NULL,        CMD_NULL }
1824    };
1825    static int default_depr_count = 0;
1826
1827    if (default_depr_count < 5) {
1828       /* TRANSLATORS: If you're unsure what "deprecated" means, see:
1829        * https://en.wikipedia.org/wiki/Deprecation */
1830       compile_diagnostic(DIAG_WARN|DIAG_COL, /**DEFAULT is deprecated - use *CALIBRATE/DATA/SD/UNITS with argument DEFAULT instead*/20);
1831       if (++default_depr_count == 5)
1832          compile_diagnostic(DIAG_WARN, /*Further uses of this deprecated feature will not be reported*/95);
1833    }
1834
1835    get_token();
1836    switch (match_tok(defaulttab, TABSIZE(defaulttab))) {
1837     case CMD_CALIBRATE:
1838       default_calib(pcs);
1839       break;
1840     case CMD_DATA:
1841       default_style(pcs);
1842       default_grade(pcs);
1843       break;
1844     case CMD_UNITS:
1845       default_units(pcs);
1846       break;
1847     default:
1848       compile_diagnostic(DIAG_ERR|DIAG_BUF|DIAG_SKIP, /*Unknown setting “%s”*/41, buffer);
1849    }
1850 }
1851 #endif
1852
1853 static void
1854 cmd_include(void)
1855 {
1856    char *pth, *fnm = NULL;
1857    int fnm_len;
1858 #ifndef NO_DEPRECATED
1859    prefix *root_store;
1860 #endif
1861    int ch_store;
1862
1863    pth = path_from_fnm(file.filename);
1864
1865    read_string(&fnm, &fnm_len);
1866
1867 #ifndef NO_DEPRECATED
1868    /* Since *begin / *end nesting cannot cross file boundaries we only
1869     * need to preserve the prefix if the deprecated *prefix command
1870     * can be used */
1871    root_store = root;
1872    root = pcs->Prefix; /* Root for include file is current prefix */
1873 #endif
1874    ch_store = ch;
1875
1876    data_file(pth, fnm);
1877
1878 #ifndef NO_DEPRECATED
1879    root = root_store; /* and restore root */
1880 #endif
1881    ch = ch_store;
1882
1883    s_free(&fnm);
1884    osfree(pth);
1885 }
1886
1887 static void
1888 cmd_sd(void)
1889 {
1890    real sd, variance;
1891    int units;
1892    unsigned long qmask, m;
1893    int quantity;
1894    qmask = get_qlist(BIT(Q_DECLINATION));
1895    if (!qmask) return; /* no quantities found - error already reported */
1896
1897    if (qmask == BIT(Q_DEFAULT)) {
1898       default_grade(pcs);
1899       return;
1900    }
1901    sd = read_numeric(fFalse);
1902    if (sd <= (real)0.0) {
1903       compile_diagnostic(DIAG_ERR|DIAG_SKIP|DIAG_COL, /*Standard deviation must be positive*/48);
1904       return;
1905    }
1906    units = get_units(qmask, fFalse);
1907    if (units == UNITS_NULL) return;
1908
1909    sd *= factor_tab[units];
1910    variance = sqrd(sd);
1911
1912    for (quantity = 0, m = BIT(quantity); m <= qmask; quantity++, m <<= 1)
1913       if (qmask & m) pcs->Var[quantity] = variance;
1914 }
1915
1916 static void
1917 cmd_title(void)
1918 {
1919    if (!fExplicitTitle && pcs->Prefix == root) {
1920        /* If we don't have an explicit title yet, and we're currently in the
1921         * root prefix, use this title explicitly. */
1922       fExplicitTitle = fTrue;
1923       read_string(&survey_title, &survey_title_len);
1924    } else {
1925       /* parse and throw away this title (but still check rest of line) */
1926       char *s = NULL;
1927       int len;
1928       read_string(&s, &len);
1929       s_free(&s);
1930    }
1931 }
1932
1933 static const sztok case_tab[] = {
1934      {"PRESERVE", OFF},
1935      {"TOLOWER",  LOWER},
1936      {"TOUPPER",  UPPER},
1937      {NULL,       -1}
1938 };
1939
1940 static void
1941 cmd_case(void)
1942 {
1943    int setting;
1944    get_token();
1945    setting = match_tok(case_tab, TABSIZE(case_tab));
1946    if (setting != -1) {
1947       pcs->Case = setting;
1948    } else {
1949       compile_diagnostic(DIAG_ERR|DIAG_BUF|DIAG_SKIP, /*Found “%s”, expecting “PRESERVE”, “TOUPPER”, or “TOLOWER”*/10, buffer);
1950    }
1951 }
1952
1953 typedef enum {
1954     CS_NONE = -1,
1955     CS_CUSTOM,
1956     CS_EPSG,
1957     CS_ESRI,
1958     CS_EUR,
1959     CS_IJTSK,
1960     CS_JTSK,
1961     CS_LAT,
1962     CS_LOCAL,
1963     CS_LONG,
1964     CS_OSGB,
1965     CS_S_MERC,
1966     CS_UTM
1967 } cs_class;
1968
1969 static const sztok cs_tab[] = {
1970      {"CUSTOM", CS_CUSTOM},
1971      {"EPSG",   CS_EPSG},       /* EPSG:<number> */
1972      {"ESRI",   CS_ESRI},       /* ESRI:<number> */
1973      {"EUR",    CS_EUR},        /* EUR79Z30 */
1974      {"IJTSK",  CS_IJTSK},      /* IJTSK or IJTSK03 */
1975      {"JTSK",   CS_JTSK},       /* JTSK or JTSK03 */
1976      {"LAT",    CS_LAT},        /* LAT-LONG */
1977      {"LOCAL",  CS_LOCAL},
1978      {"LONG",   CS_LONG},       /* LONG-LAT */
1979      {"OSGB",   CS_OSGB},       /* OSGB:<H, N, O, S or T><A-Z except I> */
1980      {"S",      CS_S_MERC},     /* S-MERC */
1981      {"UTM",    CS_UTM},        /* UTM<zone><N or S or nothing> */
1982      {NULL,     CS_NONE}
1983 };
1984
1985 static void
1986 cmd_cs(void)
1987 {
1988    char * proj_str = NULL;
1989    int proj_str_len;
1990    cs_class cs;
1991    int cs_sub = INT_MIN;
1992    filepos fp;
1993    bool output = fFalse;
1994    enum { YES, NO, MAYBE } ok_for_output = YES;
1995    static bool had_cs = fFalse;
1996
1997    if (!had_cs) {
1998       had_cs = fTrue;
1999       if (first_fix_name) {
2000          compile_diagnostic_at(DIAG_ERR,
2001                                first_fix_filename, first_fix_line,
2002                                /*Station “%s” fixed before CS command first used*/442,
2003                                sprint_prefix(first_fix_name));
2004       }
2005    }
2006
2007    get_pos(&fp);
2008    /* Note get_token() only accepts letters - it'll stop at digits so "UTM12"
2009     * will give token "UTM". */
2010    get_token();
2011    if (strcmp(ucbuffer, "OUT") == 0) {
2012       output = fTrue;
2013       get_pos(&fp);
2014       get_token();
2015    }
2016    cs = match_tok(cs_tab, TABSIZE(cs_tab));
2017    switch (cs) {
2018       case CS_NONE:
2019          break;
2020       case CS_CUSTOM:
2021          ok_for_output = MAYBE;
2022          get_pos(&fp);
2023          read_string(&proj_str, &proj_str_len);
2024          cs_sub = 0;
2025          break;
2026       case CS_EPSG: case CS_ESRI:
2027          ok_for_output = MAYBE;
2028          if (ch == ':' && isdigit(nextch())) {
2029             unsigned n = read_uint();
2030             if (n < 1000000) {
2031                cs_sub = (int)n;
2032             }
2033          }
2034          break;
2035       case CS_EUR:
2036          if (isdigit(ch) &&
2037              read_uint() == 79 &&
2038              (ch == 'Z' || ch == 'z') &&
2039              isdigit(nextch()) &&
2040              read_uint() == 30) {
2041             cs_sub = 7930;
2042          }
2043          break;
2044       case CS_JTSK:
2045          ok_for_output = NO;
2046          /* FALLTHRU */
2047       case CS_IJTSK:
2048          if (ch == '0') {
2049             if (nextch() == '3') {
2050                nextch();
2051                cs_sub = 3;
2052             }
2053          } else {
2054             cs_sub = 0;
2055          }
2056          break;
2057       case CS_LAT: case CS_LONG:
2058          ok_for_output = NO;
2059          if (ch == '-') {
2060             nextch();
2061             get_token_no_blanks();
2062             cs_class cs2 = match_tok(cs_tab, TABSIZE(cs_tab));
2063             if ((cs ^ cs2) == (CS_LAT ^ CS_LONG)) {
2064                 cs_sub = 0;
2065             }
2066          }
2067          break;
2068       case CS_LOCAL:
2069          cs_sub = 0;
2070          break;
2071       case CS_OSGB:
2072          if (ch == ':') {
2073             int uch1 = toupper(nextch());
2074             if (strchr("HNOST", uch1)) {
2075                int uch2 = toupper(nextch());
2076                if (uch2 >= 'A' && uch2 <= 'Z' && uch2 != 'I') {
2077                   int x, y;
2078                   nextch();
2079                   if (uch1 > 'I') --uch1;
2080                   uch1 -= 'A';
2081                   if (uch2 > 'I') --uch2;
2082                   uch2 -= 'A';
2083                   x = uch1 % 5;
2084                   y = uch1 / 5;
2085                   x = (x * 5) + uch2 % 5;
2086                   y = (y * 5) + uch2 / 5;
2087                   cs_sub = y * 25 + x;
2088                }
2089             }
2090          }
2091          break;
2092       case CS_S_MERC:
2093          if (ch == '-') {
2094             nextch();
2095             get_token_no_blanks();
2096             if (strcmp(ucbuffer, "MERC") == 0) {
2097                cs_sub = 0;
2098             }
2099          }
2100          break;
2101       case CS_UTM:
2102          if (isdigit(ch)) {
2103             unsigned n = read_uint();
2104             if (n >= 1 && n <= 60) {
2105                int uch = toupper(ch);
2106                cs_sub = (int)n;
2107                if (uch == 'S') {
2108                   nextch();
2109                   cs_sub = -cs_sub;
2110                } else if (uch == 'N') {
2111                   nextch();
2112                }
2113             }
2114          }
2115          break;
2116    }
2117    if (cs_sub == INT_MIN || isalnum(ch)) {
2118       set_pos(&fp);
2119       compile_diagnostic(DIAG_ERR|DIAG_TOKEN, /*Unknown coordinate system*/434);
2120       skipline();
2121       return;
2122    }
2123    /* Actually handle the cs */
2124    switch (cs) {
2125       case CS_NONE:
2126          break;
2127       case CS_CUSTOM:
2128          /* proj_str already set */
2129          break;
2130       case CS_EPSG:
2131          proj_str = osmalloc(32);
2132          sprintf(proj_str, "EPSG:%d", cs_sub);
2133          break;
2134       case CS_ESRI:
2135          proj_str = osmalloc(32);
2136          sprintf(proj_str, "ESRI:%d", cs_sub);
2137          break;
2138       case CS_EUR:
2139          proj_str = osstrdup("+proj=utm +zone=30 +ellps=intl +towgs84=-86,-98,-119,0,0,0,0 +no_defs");
2140          break;
2141       case CS_IJTSK:
2142          if (cs_sub == 0)
2143             proj_str = osstrdup("+proj=krovak +ellps=bessel +towgs84=570.8285,85.6769,462.842,4.9984,1.5867,5.2611,3.5623 +no_defs");
2144          else
2145             proj_str = osstrdup("+proj=krovak +ellps=bessel +towgs84=485.021,169.465,483.839,7.786342,4.397554,4.102655,0 +no_defs");
2146          break;
2147       case CS_JTSK:
2148          if (cs_sub == 0)
2149             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");
2150          else
2151             proj_str = osstrdup("+proj=krovak +czech +ellps=bessel +towgs84=485.021,169.465,483.839,7.786342,4.397554,4.102655,0 +no_defs");
2152          break;
2153       case CS_LAT:
2154          /* FIXME: Requires PROJ >= 4.8.0 for +axis, and the SDs will be
2155           * misapplied, so we may want to swap ourselves.  Also, while
2156           * therion supports lat-long, I'm not totally convinced that it is
2157           * sensible to do so - people often say "lat-long", but probably
2158           * don't think that that's actually "Northing, Easting".  This
2159           * seems like it'll result in people accidentally getting X and Y
2160           * swapped in their fixed points...
2161           */
2162 #if 0
2163          proj_str = osstrdup("+proj=longlat +ellps=WGS84 +datum=WGS84 +axis=neu +no_defs");
2164 #endif
2165          break;
2166       case CS_LOCAL:
2167          /* FIXME: Is it useful to be able to explicitly specify this? */
2168          break;
2169       case CS_LONG:
2170          proj_str = osstrdup("EPSG:4326");
2171          break;
2172       case CS_OSGB: {
2173          int x = 14 - (cs_sub % 25);
2174          int y = (cs_sub / 25) - 20;
2175          proj_str = osmalloc(160);
2176          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);
2177          break;
2178       }
2179       case CS_S_MERC:
2180          proj_str = osstrdup("EPSG:3857");
2181          break;
2182       case CS_UTM:
2183          proj_str = osmalloc(32);
2184          if (cs_sub > 0) {
2185             sprintf(proj_str, "EPSG:%d", 32600 + cs_sub);
2186          } else {
2187             sprintf(proj_str, "EPSG:%d", 32700 - cs_sub);
2188          }
2189          break;
2190    }
2191
2192    if (!proj_str) {
2193       /* printf("CS %d:%d\n", (int)cs, cs_sub); */
2194       set_pos(&fp);
2195       compile_diagnostic(DIAG_ERR|DIAG_TOKEN, /*Unknown coordinate system*/434);
2196       skipline();
2197       return;
2198    }
2199
2200    if (output) {
2201       if (ok_for_output == NO) {
2202          set_pos(&fp);
2203          compile_diagnostic(DIAG_ERR|DIAG_TOKEN, /*Coordinate system unsuitable for output*/435);
2204          skipline();
2205          return;
2206       }
2207
2208       /* If the output projection is already set, we still need to create the
2209        * projection object for a custom projection, so we can report errors.
2210        * But if the string is identical, we know it's valid.
2211        */
2212       if (!proj_str_out ||
2213           (ok_for_output == MAYBE && strcmp(proj_str, proj_str_out) != 0)) {
2214          PJ* pj = proj_create(PJ_DEFAULT_CTX, proj_str);
2215          if (!pj) {
2216             set_pos(&fp);
2217             compile_diagnostic(DIAG_ERR|DIAG_TOKEN, /*Invalid coordinate system: %s*/443,
2218                                proj_errno_string(proj_context_errno(PJ_DEFAULT_CTX)));
2219             skipline();
2220             return;
2221          }
2222          if (ok_for_output == MAYBE) {
2223             int type = proj_get_type(pj);
2224             if (type == PJ_TYPE_GEOGRAPHIC_2D_CRS ||
2225                 type == PJ_TYPE_GEOGRAPHIC_3D_CRS) {
2226                set_pos(&fp);
2227                compile_diagnostic(DIAG_ERR|DIAG_TOKEN, /*Coordinate system unsuitable for output*/435);
2228                skipline();
2229                return;
2230             }
2231          }
2232          if (proj_str_out) {
2233             osfree(proj_str);
2234          } else {
2235             proj_str_out = proj_str;
2236          }
2237       }
2238    } else {
2239       if (proj_str_out && strcmp(proj_str, proj_str_out) == 0) {
2240          /* Same as the current output projection. */
2241       } else {
2242          PJ* pj = proj_create(PJ_DEFAULT_CTX, proj_str);
2243          if (!pj) {
2244             set_pos(&fp);
2245             compile_diagnostic(DIAG_ERR|DIAG_TOKEN, /*Invalid coordinate system: %s*/443,
2246                                proj_errno_string(proj_context_errno(PJ_DEFAULT_CTX)));
2247             skipline();
2248             return;
2249          }
2250          proj_destroy(pj);
2251       }
2252
2253       /* Free proj if not used by parent, or as the output projection. */
2254       settings * p = pcs;
2255       if (p->proj_str && (!p->next || p->proj_str != p->next->proj_str))
2256          if (p->proj_str != proj_str_out)
2257             osfree(p->proj_str);
2258       p->proj_str = proj_str;
2259    }
2260 }
2261
2262 static const sztok infer_tab[] = {
2263      { "EQUATES",       INFER_EQUATES },
2264      { "EXPORTS",       INFER_EXPORTS },
2265      { "PLUMBS",        INFER_PLUMBS },
2266 #if 0 /* FIXME */
2267      { "SUBSURVEYS",    INFER_SUBSURVEYS },
2268 #endif
2269      { NULL,            INFER_NULL }
2270 };
2271
2272 static const sztok onoff_tab[] = {
2273      { "OFF", 0 },
2274      { "ON",  1 },
2275      { NULL, -1 }
2276 };
2277
2278 static void
2279 cmd_infer(void)
2280 {
2281    infer_what setting;
2282    int on;
2283    get_token();
2284    setting = match_tok(infer_tab, TABSIZE(infer_tab));
2285    if (setting == INFER_NULL) {
2286       compile_diagnostic(DIAG_ERR|DIAG_BUF|DIAG_SKIP, /*Found “%s”, expecting “EQUATES”, “EXPORTS”, or “PLUMBS”*/31, buffer);
2287       return;
2288    }
2289    get_token();
2290    on = match_tok(onoff_tab, TABSIZE(onoff_tab));
2291    if (on == -1) {
2292       compile_diagnostic(DIAG_ERR|DIAG_BUF|DIAG_SKIP, /*Found “%s”, expecting “ON” or “OFF”*/32, buffer);
2293       return;
2294    }
2295
2296    if (on) {
2297       pcs->infer |= BIT(setting);
2298       if (setting == INFER_EXPORTS) fExportUsed = fTrue;
2299    } else {
2300       pcs->infer &= ~BIT(setting);
2301    }
2302 }
2303
2304 static void
2305 cmd_truncate(void)
2306 {
2307    unsigned int truncate_at = 0; /* default is no truncation */
2308    filepos fp;
2309
2310    get_pos(&fp);
2311
2312    get_token();
2313    if (strcmp(ucbuffer, "OFF") != 0) {
2314       if (*ucbuffer) set_pos(&fp);
2315       truncate_at = read_uint();
2316    }
2317    /* for backward compatibility, "*truncate 0" means "*truncate off" */
2318    pcs->Truncate = (truncate_at == 0) ? INT_MAX : truncate_at;
2319 }
2320
2321 static void
2322 cmd_ref(void)
2323 {
2324    /* Just syntax check for now. */
2325    char *ref = NULL;
2326    int ref_len;
2327    read_string(&ref, &ref_len);
2328    s_free(&ref);
2329 }
2330
2331 static void
2332 cmd_require(void)
2333 {
2334    const unsigned int version[] = {COMMAVERSION};
2335    const unsigned int *ver = version;
2336    filepos fp;
2337
2338    skipblanks();
2339    get_pos(&fp);
2340    while (1) {
2341       int diff = *ver++ - read_uint();
2342       if (diff > 0) break;
2343       if (diff < 0) {
2344          size_t i, len;
2345          char *v;
2346          filepos fp_tmp;
2347
2348          /* find end of version number */
2349          while (isdigit(ch) || ch == '.') nextch();
2350          get_pos(&fp_tmp);
2351          len = (size_t)(fp_tmp.offset - fp.offset);
2352          v = osmalloc(len + 1);
2353          set_pos(&fp);
2354          for (i = 0; i < len; i++) {
2355             v[i] = ch;
2356             nextch();
2357          }
2358          v[i] = '\0';
2359          /* TRANSLATORS: Feel free to translate as "or newer" instead of "or
2360           * greater" if that gives a more natural translation.  It's
2361           * technically not quite right when there are parallel active release
2362           * series (e.g. Survex 1.0.40 was released *after* 1.2.0), but this
2363           * seems unlikely to confuse users.  "Survex" is the name of the
2364           * software, so should not be translated.
2365           *
2366           * Here "survey" is a "cave map" rather than list of questions - it should be
2367           * translated to the terminology that cavers using the language would use.
2368           */
2369          fatalerror_in_file(file.filename, file.line, /*Survex version %s or greater required to process this survey data.*/2, v);
2370       }
2371       if (ch != '.') break;
2372       nextch();
2373       if (!isdigit(ch) || ver == version + sizeof(version) / sizeof(*version))
2374          break;
2375    }
2376    /* skip rest of version number */
2377    while (isdigit(ch) || ch == '.') nextch();
2378 }
2379
2380 /* allocate new meta_data if need be */
2381 void
2382 copy_on_write_meta(settings *s)
2383 {
2384    if (!s->meta || s->meta->ref_count != 0) {
2385        meta_data * meta_new = osnew(meta_data);
2386        if (!s->meta) {
2387            meta_new->days1 = meta_new->days2 = -1;
2388        } else {
2389            *meta_new = *(s->meta);
2390        }
2391        meta_new->ref_count = 0;
2392        s->meta = meta_new;
2393    }
2394 }
2395
2396 static void
2397 cmd_date(void)
2398 {
2399     int year, month, day;
2400     int days1, days2;
2401     bool implicit_range = fFalse;
2402     filepos fp, fp2;
2403
2404     get_pos(&fp);
2405     read_date(&year, &month, &day);
2406     days1 = days_since_1900(year, month ? month : 1, day ? day : 1);
2407
2408     if (days1 > current_days_since_1900) {
2409         set_pos(&fp);
2410         compile_diagnostic(DIAG_WARN|DIAG_DATE, /*Date is in the future!*/80);
2411     }
2412
2413     skipblanks();
2414     if (ch == '-') {
2415         nextch();
2416         get_pos(&fp2);
2417         read_date(&year, &month, &day);
2418     } else {
2419         if (month && day) {
2420             days2 = days1;
2421             goto read;
2422         }
2423         implicit_range = fTrue;
2424     }
2425
2426     if (month == 0) month = 12;
2427     if (day == 0) day = last_day(year, month);
2428     days2 = days_since_1900(year, month, day);
2429
2430     if (!implicit_range && days2 > current_days_since_1900) {
2431         set_pos(&fp2);
2432         compile_diagnostic(DIAG_WARN|DIAG_DATE, /*Date is in the future!*/80);
2433     }
2434
2435     if (days2 < days1) {
2436         set_pos(&fp);
2437         compile_diagnostic(DIAG_ERR|DIAG_TOKEN, /*End of date range is before the start*/81);
2438         int tmp = days1;
2439         days1 = days2;
2440         days2 = tmp;
2441     }
2442
2443 read:
2444     if (!pcs->meta || pcs->meta->days1 != days1 || pcs->meta->days2 != days2) {
2445         copy_on_write_meta(pcs);
2446         pcs->meta->days1 = days1;
2447         pcs->meta->days2 = days2;
2448         /* Invalidate cached declination. */
2449         pcs->declination = HUGE_REAL;
2450     }
2451 }
2452
2453 typedef void (*cmd_fn)(void);
2454
2455 static const cmd_fn cmd_funcs[] = {
2456    cmd_alias,
2457    cmd_begin,
2458    cmd_calibrate,
2459    cmd_case,
2460    skipline, /*cmd_copyright,*/
2461    cmd_cs,
2462    cmd_data,
2463    cmd_date,
2464    cmd_declination,
2465 #ifndef NO_DEPRECATED
2466    cmd_default,
2467 #endif
2468    cmd_end,
2469    cmd_entrance,
2470    cmd_equate,
2471    cmd_export,
2472    cmd_fix,
2473    cmd_flags,
2474    cmd_include,
2475    cmd_infer,
2476    skipline, /*cmd_instrument,*/
2477 #ifndef NO_DEPRECATED
2478    cmd_prefix,
2479 #endif
2480    cmd_ref,
2481    cmd_require,
2482    cmd_sd,
2483    cmd_set,
2484    solve_network,
2485    skipline, /*cmd_team,*/
2486    cmd_title,
2487    cmd_truncate,
2488    cmd_units
2489 };
2490
2491 extern void
2492 handle_command(void)
2493 {
2494    int cmdtok;
2495    get_token();
2496    cmdtok = match_tok(cmd_tab, TABSIZE(cmd_tab));
2497
2498    if (cmdtok < 0 || cmdtok >= (int)(sizeof(cmd_funcs) / sizeof(cmd_fn))) {
2499       compile_diagnostic(DIAG_ERR|DIAG_BUF|DIAG_SKIP, /*Unknown command “%s”*/12, buffer);
2500       return;
2501    }
2502
2503    switch (cmdtok) {
2504     case CMD_EXPORT:
2505       if (!f_export_ok)
2506          /* TRANSLATORS: The *EXPORT command is only valid just after *BEGIN
2507           * <SURVEY>, so this would generate this error:
2508           *
2509           * *begin fred
2510           * 1 2 1.23 045 -6
2511           * *export 2
2512           * *end fred */
2513          compile_diagnostic(DIAG_ERR, /**EXPORT must immediately follow “*BEGIN <SURVEY>”*/57);
2514       break;
2515     case CMD_ALIAS:
2516     case CMD_CALIBRATE:
2517     case CMD_CASE:
2518     case CMD_COPYRIGHT:
2519     case CMD_CS:
2520     case CMD_DATA:
2521     case CMD_DATE:
2522     case CMD_DECLINATION:
2523     case CMD_DEFAULT:
2524     case CMD_FLAGS:
2525     case CMD_INFER:
2526     case CMD_INSTRUMENT:
2527     case CMD_REF:
2528     case CMD_REQUIRE:
2529     case CMD_SD:
2530     case CMD_SET:
2531     case CMD_TEAM:
2532     case CMD_TITLE:
2533     case CMD_TRUNCATE:
2534     case CMD_UNITS:
2535       /* These can occur between *begin and *export */
2536       break;
2537     default:
2538       /* NB: additional handling for "*begin <survey>" in cmd_begin */
2539       f_export_ok = fFalse;
2540       break;
2541    }
2542
2543    cmd_funcs[cmdtok]();
2544 }