2 * Empire - A multi-player, client/server Internet based war game.
3 * Copyright (C) 1986-2013, Dave Pare, Jeff Bailey, Thomas Ruschak,
4 * Ken Stevens, Steve McClure, Markus Armbruster
6 * Empire is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 3 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
21 * See files README, COPYING and CREDITS in the root of the source
22 * tree for related information and legal notices. It is expected
23 * that future projects/authors will amend these files as needed.
27 * xundump.c: Load back xdump output
29 * Known contributors to this file:
30 * Ron Koenderink, 2005
31 * Markus Armbruster, 2005-2011
35 * See doc/xdump! And keep it up-to-date.
37 * Parsing of machine-readable xdump is not precise: it recognizes
38 * comments, accepts whitespace in place of single space, and accepts
39 * the full human-readable field syntax instead of its machine-
43 * - Normalize terminology: table/rows/columns or file/records/fields
44 * - Loading tables with NSC_STRING elements more than once leaks memory
46 * - Symbolic array indexes
47 * - Option to treat missing and unknown fields as warning, not error
48 * TODO, but hardly worth the effort:
49 * - Permit reordering of array elements
66 static char *fname; /* Name of file being read */
67 static int lineno; /* Current line number */
69 static int cur_type; /* Current table's file type */
70 static int partno; /* Counts from 0..#parts-1 */
71 static void *cur_obj; /* The object being read into */
72 static int cur_id; /* and its index in the table */
74 static unsigned char *idgap; /* idgap && idgap[ID] iff part#0 lacks ID */
75 static int idgap_len; /* #elements in idgap[] */
77 static int human; /* Reading human-readable syntax? */
78 static int ellipsis; /* Header ended with ...? */
79 static int nflds; /* #fields in input records */
80 static struct castr **fldca; /* Map field number to selector */
81 static int *fldidx; /* Map field number to index */
82 static int *caflds; /* Map selector number to #fields seen */
83 static int *cafldspp; /* ditto, in previous parts */
84 static int may_omit_id; /* Okay to omit IDs? */
85 static int may_trunc; /* Okay to truncate? */
87 static int gripe(char *, ...) ATTRIBUTE((format (printf, 1, 2)));
88 static int deffld(int, char *, int);
89 static int defellipsis(void);
90 static int chkflds(void);
91 static int setnum(int, double);
92 static int setstr(int, char *);
93 static int setsym(int, char *);
94 static int mtsymset(int, long *);
95 static int add2symset(int, long *, char *);
96 static int xubody(FILE *);
97 static int xutail(FILE *, struct castr *);
100 * Gripe about the current line to stderr, return -1.
103 gripe(char *fmt, ...)
107 fprintf(stderr, "%s:%d: ", fname, lineno);
109 vfprintf(stderr, fmt, ap);
116 /* Make TYPE the current table. */
124 old_nelem = type == EF_BAD ? 0 : ef_nelem(type);
129 /* End the current table. */
138 * Seek to current table's ID-th record.
139 * ID must be acceptable.
140 * Store it in cur_obj, and set cur_id accordingly.
141 * Return 0 on success, -1 on failure.
146 struct empfile *ep = &empfile[cur_type];
148 if (id >= ef_nelem(cur_type)) {
149 if (!ef_ensure_space(cur_type, id, 1))
150 return gripe("Can't put ID %d into table %s", id, ep->name);
153 cur_obj = ef_ptr(cur_type, id);
154 if (CANT_HAPPEN(!cur_obj))
161 * Get the next object.
162 * Must not have a record index.
163 * Store it in cur_obj, and set cur_id accordingly.
164 * Return 0 on success, -1 on failure.
169 int max_id = ef_id_limit(cur_type);
171 if (cur_id >= max_id)
172 return gripe("Too many rows");
173 return tbl_seek(cur_id + 1);
178 * Reset the omitted objects to default state.
181 omit_ids(int id1, int id2)
188 idgap = realloc(idgap, id2 * sizeof(*idgap));
189 for (i = idgap_len; i < id1; i++)
191 for (i = id1; i < id2; i++) {
192 ef_blank(cur_type, i, ef_ptr(cur_type, i));
199 * Return the smallest non-omitted ID in ID1..ID2-1 if any, else -1.
202 expected_id(int id1, int id2)
206 for (i = id1; i < id2; i++) {
207 if (i >= idgap_len || !idgap[i])
214 * Get the next object, it has record index ID.
215 * Store it in cur_obj, and set cur_id accordingly.
216 * Ensure we're omitting the same objects as the previous parts.
217 * Reset any omitted objects to default state.
218 * Return 0 on success, -1 on failure.
221 tbl_skip_to_obj(int id)
223 struct empfile *ep = &empfile[cur_type];
224 int prev_id = cur_id;
228 if (!may_omit_id && id != cur_id + 1)
229 return gripe("Expected %d in field %d", cur_id + 1, 1);
231 return gripe("Field %d must be > %d", 1, cur_id);
232 max_id = ef_id_limit(cur_type);
234 return gripe("Field %d must be <= %d", 1, max_id);
236 exp_id = expected_id(cur_id + 1, ep->fids);
238 return gripe("Table's first part doesn't have this row");
239 else if (id != exp_id)
240 return gripe("Expected %d in field %d,"
241 " like in table's first part",
245 if (tbl_seek(id) < 0)
249 omit_ids(prev_id + 1, id);
255 * If the table has variable length, truncate it.
256 * Else ensure we're omitting the same objects as the previous parts.
257 * Reset any omitted objects to default state.
258 * Return 0 on success, -1 on failure.
263 struct empfile *ep = &empfile[cur_type];
266 if (cur_id + 1 < ep->fids) {
269 if (!ef_truncate(cur_type, cur_id + 1))
273 return gripe("Expected %d more rows",
274 ep->fids - (cur_id + 1));
275 omit_ids(cur_id + 1, ep->fids);
278 exp_id = expected_id(cur_id + 1, ep->fids);
280 return gripe("Expected row with %d in field %d,"
281 " like in table's first part",
293 * Read and ignore field separators from FP.
294 * Return first character that is not a field separator.
303 } while (ch == ' ' || ch == '\t');
308 } while (ch != EOF && ch != '\n');
315 * Decode escape sequences in BUF.
316 * Return BUF on success, null pointer on failure.
328 if (sscanf(++src, "%3o%n", &octal_chr, &n) != 1 || n != 3)
330 *dst++ = (char)octal_chr;
340 * Read an identifier from FP into BUF.
341 * BUF must have space for 1024 characters.
342 * Return number of characters read on success, -1 on failure.
345 getid(FILE *fp, char *buf)
348 if (fscanf(fp, "%1023[^\"#()<>= \t\n]%n", buf, &n) != 1
356 * Try to read a field name from FP.
357 * I is the field number, counting from zero.
358 * If a name is read, set fldca[I] and fldidx[I] for it, and update
360 * Return 1 if a name or ... was read, 0 on end of line, -1 on error.
363 xufldname(FILE *fp, int i)
371 return gripe("Unexpected EOF");
378 if (getc(fp) != '.' || getc(fp) != '.')
379 return gripe("Junk in header field %d", i + 1);
380 if (defellipsis() < 0)
383 if (ch != EOF && ch != '\n')
384 return gripe("Junk after ...");
389 if (getid(fp, buf) < 0)
390 return gripe("Junk in header field %d", i + 1);
394 return deffld(i, buf, -1);
398 if (isdigit(ch) || ch == '-' || ch == '+') {
399 if (fscanf(fp, "%d", &idx) != 1)
400 return gripe("Malformed number in index of header field %d",
403 return gripe("Index must not be negative in header field %d",
406 if (getid(fp, buf) < 0)
407 return gripe("Malformed index in header field %d", i + 1);
408 return gripe("Symbolic index in header field %d not yet implemented",
413 return gripe("Malformed index in header field %d", i + 1);
414 return deffld(i, buf, idx);
419 * Try to read a field value from FP.
420 * I is the field number, counting from zero.
421 * Return 1 if a value was read, 0 on end of line, -1 on error.
424 xufld(FILE *fp, int i)
434 return gripe("Unexpected EOF");
436 CANT_HAPPEN(i > nflds);
438 if (fldca[i]->ca_type != NSC_STRINGY && fldca[i]->ca_len)
439 return gripe("Field %s(%d) missing",
440 fldca[i]->ca_name, fldidx[i]);
441 return gripe("Field %s missing", fldca[i]->ca_name);
445 case '+': case '-': case '.':
446 case '0': case '1': case '2': case '3': case '4':
447 case '5': case '6': case '7': case '8': case '9':
449 if (fscanf(fp, "%lg", &dbl) != 1)
450 return gripe("Malformed number in field %d", i + 1);
451 return setnum(i, dbl);
458 if (fscanf(fp, "%1023[^\"\n]", buf) != 1 || getc(fp) != '"')
459 return gripe("Malformed string in field %d", i + 1);
461 return gripe("Invalid escape sequence in field %d",
464 return setstr(i, buf);
466 if (mtsymset(i, &set) < 0)
470 if (ch == EOF || ch == '\n')
471 return gripe("Unmatched '(' in field %d", i + 1);
475 if (getid(fp, buf) < 0)
476 return gripe("Junk in field %d", i + 1);
477 if (add2symset(i, &set, buf) < 0)
480 return setnum(i, set);
483 if (getid(fp, buf) < 0)
484 return gripe("Junk in field %d", i + 1);
485 if (!strcmp(buf, "nil"))
486 return setstr(i, NULL);
488 return setsym(i, buf);
493 * Read fields from FP.
494 * Use PARSE() to read each field.
495 * Return number of fields read on success, -1 on error.
498 xuflds(FILE *fp, int (*parse)(FILE *, int))
511 else if (ch != ' ' && ch != '\t')
512 return gripe("Bad field separator after field %d", i + 1);
517 * Define the FLDNO-th field.
518 * If IDX is negative, define as selector NAME, else as NAME(IDX).
519 * Set fldca[FLDNO] and fldidx[FLDNO] accordingly.
521 * Return 1 on success, -1 on error.
524 deffld(int fldno, char *name, int idx)
526 struct castr *ca = ef_cadef(cur_type);
529 res = stmtch(name, ca, offsetof(struct castr, ca_name),
530 sizeof(struct castr));
532 return gripe("Header %s of field %d is %s", name, fldno + 1,
533 res == M_NOTUNIQUE ? "ambiguous" : "unknown");
534 if ((ca[res].ca_flags & NSC_EXTRA) || CANT_HAPPEN(ca[res].ca_get))
535 return gripe("Extraneous header %s in field %d", name, fldno + 1);
536 if (ca[res].ca_type != NSC_STRINGY && ca[res].ca_len != 0) {
538 return gripe("Header %s requires an index in field %d",
539 ca[res].ca_name, fldno + 1);
540 if (idx >= ca[res].ca_len)
541 return gripe("Header %s(%d) index out of bounds in field %d",
542 ca[res].ca_name, idx, fldno + 1);
543 if (idx < caflds[res])
544 return gripe("Duplicate header %s(%d) in field %d",
545 ca[res].ca_name, idx, fldno + 1);
546 if (idx > caflds[res])
547 return gripe("Expected header %s(%d) in field %d",
548 ca[res].ca_name, caflds[res], fldno + 1);
551 return gripe("Header %s doesn't take an index in field %d",
552 ca[res].ca_name, fldno + 1);
555 return gripe("Duplicate header %s in field %d",
556 ca[res].ca_name, fldno + 1);
558 fldca[fldno] = &ca[res];
565 * Record that header ends with ...
566 * Set ellipsis and is_partial.
567 * Return 0 on success, -1 on error.
572 struct castr *ca = ef_cadef(cur_type);
574 if (ca[0].ca_table != cur_type || (ca[0].ca_flags & NSC_EXTRA))
575 return gripe("Table %s doesn't support ...", ef_nameof(cur_type));
580 /* Is table split into parts? */
584 return ellipsis || partno;
588 * Check fields in xdump are sane.
589 * Return 0 on success, -1 on error.
594 struct castr *ca = ef_cadef(cur_type);
595 int i, len, cafldsmax, res = 0;
597 /* Record index must come first, to make cur_id work, see setnum() */
598 if (ca[0].ca_table == cur_type && caflds[0] && fldca[0] != &ca[0])
599 res = gripe("Header field %s must come first", ca[0].ca_name);
602 /* Need a join field, use 0-th selector */
604 res = gripe("Header field %s required in each table part",
609 return res; /* table is split, another part expected */
611 /* Check for missing fields */
612 for (i = 0; ca[i].ca_name; i++) {
613 cafldsmax = MAX(caflds[i], cafldspp[i]);
614 if (ca[i].ca_flags & NSC_EXTRA)
616 len = ca[i].ca_type != NSC_STRINGY ? ca[i].ca_len : 0;
617 if (!len && !cafldsmax)
618 res = gripe("Header field %s missing", ca[i].ca_name);
619 else if (len && cafldsmax == len - 1)
620 res = gripe("Header field %s(%d) missing",
621 ca[i].ca_name, len - 1);
622 else if (len && cafldsmax < len - 1)
623 res = gripe("Header fields %s(%d) ... %s(%d) missing",
624 ca[i].ca_name, cafldsmax, ca[i].ca_name, len - 1);
631 * Get selector for field FLDNO.
632 * Assign the field's selector index to *IDX, unless it is null.
633 * Return the selector on success, null pointer on error.
635 static struct castr *
636 getfld(int fldno, int *idx)
638 if (fldno >= nflds) {
639 gripe("Too many fields, expected only %d", nflds);
642 if (CANT_HAPPEN(fldno < 0))
645 *idx = fldidx[fldno];
650 * Is a new value for field FLDNO required to match the old one?
653 fldval_must_match(int fldno)
655 struct castr *ca = ef_cadef(cur_type);
656 int i = fldca[fldno] - ca;
659 * Value must match if:
660 * it's for a const selector, unless the object is still blank, or
661 * it was already given in a previous part of a split table.
663 return (cur_id < old_nelem && (fldca[fldno]->ca_flags & NSC_CONST))
664 || fldidx[fldno] < cafldspp[i];
668 * Set value of field FLDNO in current object to DBL.
669 * Return 1 on success, -1 on error.
672 setnum(int fldno, double dbl)
679 ca = getfld(fldno, &idx);
684 if (ca->ca_table == cur_type) {
685 /* Got record index */
688 return gripe("Field %d can't hold this value", fldno + 1);
689 if (tbl_skip_to_obj(next_id) < 0)
692 if (tbl_next_obj() < 0)
697 memb_ptr += ca->ca_off;
699 switch (ca->ca_type) {
701 old = ((signed char *)memb_ptr)[idx];
702 new = ((signed char *)memb_ptr)[idx] = (signed char)dbl;
706 old = ((unsigned char *)memb_ptr)[idx];
707 new = ((unsigned char *)memb_ptr)[idx] = (unsigned char)dbl;
710 old = ((short *)memb_ptr)[idx];
711 new = ((short *)memb_ptr)[idx] = (short)dbl;
714 old = ((unsigned short *)memb_ptr)[idx];
715 new = ((unsigned short *)memb_ptr)[idx] = (unsigned short)dbl;
718 old = ((int *)memb_ptr)[idx];
719 new = ((int *)memb_ptr)[idx] = (int)dbl;
722 old = ((long *)memb_ptr)[idx];
723 new = ((long *)memb_ptr)[idx] = (long)dbl;
726 old = ((coord *)memb_ptr)[idx];
727 /* FIXME use variant of xrel() that takes orig instead of nation */
728 if (old >= WORLD_X / 2)
730 new = ((coord *)memb_ptr)[idx] = XNORM((coord)dbl);
731 if (new >= WORLD_X / 2)
735 old = ((coord *)memb_ptr)[idx];
736 /* FIXME use variant of yrel() that takes orig instead of nation */
737 if (old >= WORLD_Y / 2)
739 new = ((coord *)memb_ptr)[idx] = YNORM((coord)dbl);
740 if (new >= WORLD_Y / 2)
744 old = ((float *)memb_ptr)[idx];
745 ((float *)memb_ptr)[idx] = (float)dbl;
746 new = dbl; /* suppress new != dbl check */
749 old = ((double *)memb_ptr)[idx];
750 ((double *)memb_ptr)[idx] = dbl;
751 new = dbl; /* suppress new != dbl check */
754 old = ((time_t *)memb_ptr)[idx];
755 new = ((time_t *)memb_ptr)[idx] = (time_t)dbl;
758 return gripe("Field %d doesn't take numbers", fldno + 1);
761 if (fldval_must_match(fldno) && old != dbl)
762 return gripe("Value for field %d must be %g", fldno + 1, old);
764 return gripe("Field %d can't hold this value", fldno + 1);
770 * Set value of field FLDNO in current object to STR.
771 * Return 1 on success, -1 on error.
774 setstr(int fldno, char *str)
779 char *memb_ptr, *old;
781 ca = getfld(fldno, &idx);
786 if (tbl_next_obj() < 0)
790 memb_ptr += ca->ca_off;
791 must_match = fldval_must_match(fldno);
793 switch (ca->ca_type) {
795 old = ((char **)memb_ptr)[idx];
797 /* FIXME may leak old value */
798 ((char **)memb_ptr)[idx] = str ? strdup(str) : NULL;
799 len = 65535; /* really SIZE_MAX, but that's C99 */
802 if (CANT_HAPPEN(idx))
805 return gripe("Field %d doesn't take nil", fldno + 1);
807 if (strlen(str) > len)
808 return gripe("Field %d takes at most %d characters",
809 fldno + 1, (int)len);
812 strncpy(memb_ptr, str, len);
815 return gripe("Field %d doesn't take strings", fldno + 1);
819 if (old && (!str || strncmp(old, str, len)))
820 return gripe("Value for field %d must be \"%.*s\"",
821 fldno + 1, (int)len, old);
823 return gripe("Value for field %d must be nil", fldno + 1);
830 * Resolve symbol name ID in table referred to by CA.
831 * Use field number N for error messages.
832 * Return index in referred table on success, -1 on failure.
835 xunsymbol(char *id, struct castr *ca, int n)
837 int i = ef_elt_byname(ca->ca_table, id);
839 return gripe("%s %s symbol `%s' in field %d",
840 i == M_NOTUNIQUE ? "Ambiguous" : "Unknown",
841 ca->ca_name, id, n + 1);
846 * Map symbol index to symbol value.
847 * CA is the table, and I is the index in it.
850 symval(struct castr *ca, int i)
852 int type = ca->ca_table;
854 if (type != EF_BAD && ef_cadef(type) == symbol_ca)
855 /* symbol table, value is in the table */
856 return ((struct symbol *)ef_ptr(type, i))->value;
857 /* value is the table index */
862 * Set value of field FLDNO in current object to value of symbol SYM.
863 * Return 1 on success, -1 on error.
866 setsym(int fldno, char *sym)
871 ca = getfld(fldno, NULL);
875 if (ca->ca_table == EF_BAD || (ca->ca_flags & NSC_BITS))
876 return gripe("Field %d doesn't take symbols", fldno + 1);
878 i = xunsymbol(sym, ca, fldno);
881 return setnum(fldno, symval(ca, i));
885 * Create an empty symbol set for field FLDNO in *SET.
886 * Return 1 on success, -1 on error.
889 mtsymset(int fldno, long *set)
893 ca = getfld(fldno, NULL);
897 if (ca->ca_table == EF_BAD || ef_cadef(ca->ca_table) != symbol_ca
898 || !(ca->ca_flags & NSC_BITS))
899 return gripe("Field %d doesn't take symbol sets", fldno + 1);
905 * Add a symbol to a symbol set for field FLDNO in *SET.
906 * SYM is the name of the symbol to add.
907 * Return 1 on success, -1 on error.
910 add2symset(int fldno, long *set, char *sym)
915 ca = getfld(fldno, NULL);
919 i = xunsymbol(sym, ca, fldno);
922 *set |= symval(ca, i);
927 * Read an xdump table header line from FP.
928 * Expect header for EXPECTED_TABLE, unless it is EF_BAD.
929 * Recognize header for machine- and human-readable syntax, and set
931 * Return table type on success, -2 on EOF before header, -1 on failure.
934 xuheader(FILE *fp, int expected_table)
940 while ((ch = skipfs(fp)) == '\n')
942 if (ch == EOF && expected_table == EF_BAD)
949 ? fscanf(fp, "config%*[ \t]%63[^ \t#\n]%n", name, &res) != 1
950 : fscanf(fp, "XDUMP%*[ \t]%63[^ \t#\n]%*[ \t]%*[^ \t#\n]%n",
951 name, &res) != 1) || res < 0)
952 return gripe("Expected xdump header");
954 type = ef_byname(name);
956 return gripe("Unknown table `%s'", name);
957 if (expected_table != EF_BAD && expected_table != type)
958 return gripe("Expected table `%s', not `%s'",
959 ef_nameof(expected_table), name);
961 if (!empfile[type].file
962 || !ef_cadef(type) || !(ef_flags(type) & EFF_MEM)) {
963 CANT_HAPPEN(expected_table != EF_BAD);
964 return gripe("Table `%s' is not permitted here", name);
967 if (skipfs(fp) != '\n')
968 return gripe("Junk after xdump header");
975 * Find fields in this xdump.
976 * If reading human-readable syntax, read a field header line from FP.
977 * Else take fields from the table's selectors in CA[].
978 * Set ellipsis, nflds, fldca[], fldidx[] and caflds[] accordingly.
979 * Return 0 on success, -1 on failure.
982 xufldhdr(FILE *fp, struct castr ca[])
988 for (i = 0; ca[i].ca_name; i++)
993 while ((ch = skipfs(fp)) == '\n')
996 nflds = xuflds(fp, xufldname);
999 nflds -= ellipsis != 0;
1004 for (i = 0; ca[i].ca_name; i++) {
1005 if ((ca[i].ca_flags & NSC_EXTRA))
1007 n = ca[i].ca_type != NSC_STRINGY ? ca[i].ca_len : 0;
1015 nflds = fidx - fldidx;
1022 * Read xdump footer from FP.
1023 * CA[] contains the table's selectors.
1024 * The body had RECS records.
1025 * Update cafldspp[] from caflds[].
1026 * Return 0 on success, -1 on failure.
1029 xufooter(FILE *fp, struct castr ca[], int recs)
1035 if (fscanf(fp, "config%n", &res) != 0 || res < 0)
1036 return gripe("Malformed table footer");
1038 if (fscanf(fp, "%d", &n) != 1)
1039 return gripe("Malformed table footer");
1041 return gripe("Read %d rows, which doesn't match footer "
1042 "%d rows", recs, n);
1044 if (skipfs(fp) != '\n')
1045 return gripe("Junk after table footer");
1046 if (tbl_part_done() < 0)
1050 for (i = 0; ca[i].ca_name; i++) {
1051 if (cafldspp[i] < caflds[i])
1052 cafldspp[i] = caflds[i];
1059 * Read an xdump table from FP.
1060 * Both machine- and human-readable xdump syntax are recognized.
1061 * Expect table EXPECTED_TABLE, unless it is EF_BAD.
1062 * Report errors to stderr.
1063 * Messages assume FP starts in the file FILE at line *PLNO.
1064 * Update *PLNO to reflect lines read from FP.
1065 * Return table type on success, -2 on EOF before header, -1 on failure.
1068 xundump(FILE *fp, char *file, int *plno, int expected_table)
1071 int type, nca, nf, i, ch;
1076 if ((type = xuheader(fp, expected_table)) < 0)
1079 ca = ef_cadef(type);
1080 if (CANT_HAPPEN(!ca))
1085 may_trunc = empfile[type].nent < 0;
1086 for (i = 0; ca[i].ca_name; i++) {
1088 if (!(ca[i].ca_flags & NSC_EXTRA)) {
1089 nf += MAX(1, ca[i].ca_type != NSC_STRINGY ? ca[i].ca_len : 0);
1090 if (ca[i].ca_flags & NSC_CONST)
1091 may_omit_id = may_trunc = 0;
1094 fldca = malloc(nf * sizeof(*fldca));
1095 fldidx = malloc(nf * sizeof(*fldidx));
1096 caflds = malloc(nca * sizeof(*caflds));
1097 cafldspp = calloc(nca, sizeof(*cafldspp));
1100 if (xutail(fp, ca) < 0)
1109 /* Skip empty lines so that callers can easily check for EOF */
1110 while ((ch = skipfs(fp)) == '\n')
1119 * Read the remainder of an xdump after the table header line from FP.
1120 * CA[] contains the table's selectors.
1121 * Return 0 on success, -1 on failure.
1124 xutail(FILE *fp, struct castr *ca)
1129 if (xufldhdr(fp, ca) < 0)
1131 if ((recs = xubody(fp)) < 0)
1133 if (xufooter(fp, ca, recs) < 0)
1137 if (xuheader(fp, cur_type) < 0)
1143 * Read the body of an xdump table from FP.
1144 * Return number of rows read on success, -1 on failure.
1152 while ((ch = skipfs(fp)) == '\n')
1157 if (xuflds(fp, xufld) < 0)