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database.c
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database.c
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/*** database.c ***************************************************************
**
** This file is part of BibTool.
** It is distributed under the GNU General Public License.
** See the file COPYING for details.
**
** (c) 1996-20120Gerd Neugebauer
**
** Net: [email protected]
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2, or (at your option)
** any later version.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
**
**-----------------------------------------------------------------------------
** Description:
** This module contains functions which deal with databases.
** Databases are stored in an abstract datatype |DB| which is defined
** in |database.h|. Methods are provided to query and modify a database.
**
******************************************************************************/
#include <bibtool/general.h>
#include <bibtool/expand.h>
#include <bibtool/symbols.h>
#include <bibtool/database.h>
#include <bibtool/record.h>
#include <bibtool/parse.h>
#include <bibtool/macros.h>
#include <bibtool/print.h>
#include <bibtool/error.h>
#include <bibtool/entry.h>
#include <bibtool/key.h>
#include <bibtool/rsc.h>
/*****************************************************************************/
/* Internal Programs */
/*===========================================================================*/
#ifdef __STDC__
#define _ARG(A) A
#else
#define _ARG(A) ()
#endif
static Record insert_record _ARG((Record rec, Record ptr,int (*less)_ARG((Record, Record))));/**/
static Record rec__sort _ARG((Record rec,int (*less)_ARG((Record, Record))));/**/
static int cmp_heap _ARG((Record r1, Record r2)); /* */
static void mark_string _ARG((Record rec, String s));/* */
/*****************************************************************************/
/* External Programs */
/*===========================================================================*/
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
#define SkipWarning WARNING("Skipping to next '@'")
/*---------------------------------------------------------------------------*/
/*-----------------------------------------------------------------------------
** Function: new_db()
** Purpose: Create a new database and initialize it to contain no
** information.
** If no memory is left then an error is raised and the program
** is terminated.
** Arguments: none
** Returns: The new database.
**___________________________________________________ */
DB new_db() /* */
{ register DB new; /* */
/* */
if ((new=(DB)malloc(sizeof(sDB))) == NoDB) /* */
{ OUT_OF_MEMORY("db"); } /* */
DBnormal(new) = RecordNULL; /* */
DBstring(new) = RecordNULL; /* */
DBpreamble(new) = RecordNULL; /* */
DBcomment(new) = RecordNULL; /* */
DBalias(new) = RecordNULL; /* */
DBinclude(new) = RecordNULL; /* */
DBmodify(new) = RecordNULL; /* */
return new; /* */
} /*------------------------*/
/*-----------------------------------------------------------------------------
** Function: free_db()
** Purpose: Deallocate the memory occupied by a database.
** Note that any references to this database becomes invalid.
** Arguments:
** db Database to release.
** Returns: nothing
**___________________________________________________ */
void free_db(db) /* */
DB db; /* */
{ /* */
free_record(DBnormal(db)); /* */
free_record(DBstring(db)); /* */
free_record(DBpreamble(db)); /* */
free_record(DBcomment(db)); /* */
free_record(DBalias(db)); /* */
free_record(DBinclude(db)); /* */
free_record(DBmodify(db)); /* */
free(db); /* */
} /*------------------------*/
/*-----------------------------------------------------------------------------
** Function: apply_modify()
** Type: int
** Purpose:
**
** Arguments:
** db the database
** key the key
** rec the record
** Returns:
**___________________________________________________ */
int apply_modify(db, key, rec) /* */
DB db; /* */
Symbol key; /* */
Record rec; /* */
{ Symbol *hp = RecordHeap(rec); /* */
int i; /* */
Record r = db_find(db, key); /* */
if (r == RecordNULL) /* */
{ WARNING2("Entry to modify not found: ", /* */
SymbolValue(key)); /* */
return 0; /* */
} /* */
DebugPrint2("Modify ", /* */
SymbolValue(*RecordHeap(rec))); /* */
/* */
for (i = RecordFree(rec); i > 0; i -= 2) /* */
{ /* No deleted or */
if (*hp && /* */
is_allowed(*SymbolValue(*hp)) && /* */
*(hp+1)) /* private entry */
{ DebugPrint3(SymbolValue(*hp), /* */
" => ", /* */
SymbolValue(*(hp+1))); /* */
push_to_record(r, *hp, *(hp+1), false); /* */
} /* */
hp += 2; /* Goto next pair. */
} /* */
return 1; /* */
} /*------------------------*/
/*-----------------------------------------------------------------------------
** Function*: apply_alias()
** Type: bool
** Purpose:
**
** Arguments:
** db the database
** key the key
** rec the record
** verbose the verbose indicator
** Returns:
**___________________________________________________ */
static bool apply_alias(db, key, rec, verbose) /* */
DB db; /* */
Symbol key; /* */
Record rec; /* */
bool verbose; /* */
{ Record r = db_find(db, key); /* */
if (r == RecordNULL) /* */
{ WARNING2("Entry to alias not found: ", key); /* */
return false; /* */
} /* */
DebugPrint2("Alias ", /* */
SymbolValue(*RecordHeap(rec))); /* */
/* */
r = copy_record(r); /* Make a private copy. */
RecordOldKey(r) = *RecordHeap(rec); /* */
*RecordHeap(r) = *RecordHeap(rec); /* */
db_insert(db, r, verbose); /* */
return true; /* */
} /*------------------------*/
/*-----------------------------------------------------------------------------
** Function: db_insert()
** Purpose: Add a record to a database.
** The record can be any kind of record. It is added to the
** appropriate category.
** Arguments:
** db Database to insert the record into.
** rec Record to add to the database.
** verbose Boolean to determine whether progress should be reported.
** Returns: nothing
**___________________________________________________ */
void db_insert(db, rec, verbose) /* */
DB db; /* */
Record rec; /* */
bool verbose; /* */
{ Record *rp; /* */
/* */
switch (RecordType(rec)) /* */
{ case BIB_STRING: /* */
rp = &DBstring(db); /* */
DebugPrint1("Inserting String"); /* */
break; /* */
case BIB_PREAMBLE: /* */
rp = &DBpreamble(db); /* */
DebugPrint1("Inserting Preamble"); /* */
break; /* */
case BIB_COMMENT: /* */
rp = &DBcomment(db); /* */
DebugPrint1("Inserting Comment"); /* */
break; /* */
case BIB_MODIFY: /* */
if(rsc_apply_modify && /* */
apply_modify(db, *RecordHeap(rec), rec)) /* */
{ free_record(rec); /* */
return; /* */
} else { /* */
rp = &DBmodify(db); /* */
DebugPrint1("Inserting Modify"); /* */
} /* */
break; /* */
case BIB_INCLUDE: /* */
if(rsc_apply_include) /* */
{ DebugPrint2("Including ", /* */
SymbolValue(*RecordHeap(rec)));/* */
if (read_db(db, /* */
SymbolValue(*RecordHeap(rec)), /* */
verbose)) /* */
{ ERROR2("File not found: ", /* */
SymbolValue(*RecordHeap(rec))); /* */
} /* */
free_record(rec); /* */
return; /* */
} else { /* */
rp = &DBinclude(db); /* */
DebugPrint1("Inserting Include"); /* */
} /* */
break; /* */
case BIB_ALIAS: /* */
if (rsc_apply_alias) /* */
{ DebugPrint2("Alias ", /* */
SymbolValue(*RecordHeap(rec)));/* */
apply_alias(db, *(RecordHeap(rec)+1), /* */
rec, verbose); /* */
free_record(rec); /* */
return; /* */
} else { /* */
rp = &DBalias(db); /* */
DebugPrint1("Inserting Alias"); /* */
} /* */
break; /* */
default: /* */
rp = &DBnormal(db); /* */
DebugPrint2("Inserting Entry ", /* */
SymbolValue(*RecordHeap(rec))); /* */
break; /* */
} /* */
/* */
if (*rp == RecordNULL) /* List is empty */
{ *rp = rec; } /* Just remember the rec. */
else /* */
{ NextRecord(*rp) = rec; /* */
PrevRecord(rec) = *rp; /* */
*rp = rec; /* */
} /* */
} /*------------------------*/
/*-----------------------------------------------------------------------------
** Function: read_db()
** Purpose: Read records from a file and add them to a database.
** A function has to be given as one argument. This function is
** called for each record. If this function returns |true| then
** the record is added to the database. Otherwise the record is
** discarded.
**
** The progress of reading is reported to |stderr| if the
** boolean argument |verbose| is |true|.
** Arguments:
** db Database to augment.
** file File name to read from.
** verbose Boolean to determine whether progress should be reported.
** Returns: |true| if the file can not be opened. |false| otherwise.
**___________________________________________________ */
bool read_db(db, file, verbose) /* */
DB db; /* */
String file; /* */
bool verbose; /* */
{ register int type; /* */
static Record master_record = RecordNULL; /* */
Record rec; /* */
register Record dbn; /* */
/* */
if (!see_bib(file)) return 1; /* */
if (master_record == RecordNULL) /* */
{ master_record = new_record(0, 32); } /* */
/* */
if (file == NULL) /* */
{ file = (String)"<stdin>"; /* */
RecordSource(master_record) = sym_empty; /* */
LinkSymbol(sym_empty); /* */
} /* */
else /* */
{ RecordSource(master_record) = symbol(file); /* */
} /* */
/* */
if (verbose) /* If desired print an */
{ VerbosePrint2("Reading ",file); } /* open message. */
/* */
dbn = DBnormal(db); /* */
if (dbn != RecordNULL) /* */
{ /* */
while (NextRecord(dbn) != RecordNULL) /* */
{ dbn = NextRecord(dbn); } /* */
} /* */
DBnormal(db) = dbn; /* */
/* */
for (type = parse_bib(master_record); /* */
type != BIB_EOF; /* */
type = parse_bib(master_record)) /* */
{ /* */
if (type < 0) /* Errors give rise to */
{ SkipWarning; } /* a warning. */
else if (IsSpecialRecord(type)) /* STRING/PREAMBLE/COMMENT*/
{ db_insert(db, /* */
copy_record(master_record), /* */
verbose); /* */
} /* */
else /* */
{ rec = copy_record(master_record); /* Make a private copy. */
RecordOldKey(rec) = *RecordHeap(rec); /* */
db_insert(db,rec, verbose); /* */
if (verbose) { ErrC('+'); FlushErr; } /* */
} /* */
} /* */
/* */
if (verbose) /* If desired print a */
{ VerbosePrint2("Done with ",file); } /* close message. */
/* */
(void)seen(); /* Close the file. */
/* */
return false; /* */
} /*------------------------*/
/*-----------------------------------------------------------------------------
** Function*: mark_string()
** Purpose:
**
**
** Arguments:
** rec the record
** s the string
** Returns: nothing
**___________________________________________________ */
static void mark_string(rec, s) /* */
Record rec; /* */
String s; /* */
{ int d; /* */
Record r; /* */
/* */
while (*s) /* */
{ /* */
switch (*s) /* */
{ case '\0': return; /* */
case '"': /* */
d = 0; /* */
while (*++s && (*s != '"' || d > 0)) /* */
{ switch (*s) /* */
{ case '{': d++; break; /* */
case '}': d--; break; /* */
case '\\': if (s[1]) s++; /* */
} /* */
} /* */
if (*s) s++; /* */
break; /* */
case '{': /* */
d = 1; /* */
while (*++s && d > 0) /* */
{ switch (*s) /* */
{ case '{': d++; break; /* */
case '}': d--; break; /* */
case '\\': if (s[1]) s++; /* */
} /* */
} /* */
if (*s) s++; /* */
break; /* */
default: /* */
if (is_allowed(*s)) /* */
{ Symbol mac = sym_extract(&s, false); /* */
/* */
for (r = rec; r; r = NextRecord(r)) /* */
{ if (*RecordHeap(r) == mac) /* */
{ SetRecordMARK(r); /* */
break; /* */
} /* */
} /* */
} /* */
else s++; /* */
} /* */
} /* */
} /*------------------------*/
/*-----------------------------------------------------------------------------
** Function*: print_segment()
** Type: void
** Purpose:
**
** Arguments:
** file the file
** db the database
** rec the record
** allp the indicator for printing all
** Returns: nothing
**___________________________________________________ */
static void print_segment(file, db, rec, allp) /* */
FILE *file; /* */
DB db; /* */
Record rec; /* */
bool allp; /* */
{ /* */
if (rec == RecordNULL) return; /* */
/* */
while (PrevRecord(rec) != RecordNULL) /* Rewind to beginning. */
{ rec = PrevRecord(rec); } /* */
/* */
for ( ; rec != RecordNULL; rec = NextRecord(rec))/* */
{ /* */
if (!RecordIsDELETED(rec)) /* */
{ if (allp || RecordIsMARKED(rec)) /* */
{ fput_record(file, rec, db, (String)"@"); /* */
} /* */
} /* */
else if (rsc_del_q) /* */
{ fput_record(file, rec,db, rsc_del_pre); } /* */
} /* */
} /*------------------------*/
/*-----------------------------------------------------------------------------
** Function*: preprint_string()
** Type: void
** Purpose:
**
** Arguments:
** file the file
** db the database
** strings the string definition
** rec the record
** Returns: nothing
**___________________________________________________ */
static void preprint_string(file, db, strings, rec)/* */
FILE *file; /* */
DB db; /* */
Record strings; /* */
Record rec; /* */
{ int i, d; /* */
Record r; /* */
/* */
for (i = 0; i < RecordFree(rec); i += 2) /* */
{ if (RecordHeap(rec)[i] != NO_SYMBOL) /* */
{ String s = SymbolValue(RecordHeap(rec)[i+1]);/* */
/* */
while(*s) /* */
{ /* */
switch (*s) /* */
{ case '\0': return; /* */
case '"': /* */
d = 0; /* */
while (*++s && (*s != '"' || d > 0)) /* */
{ switch (*s) /* */
{ case '{': d++; break; /* */
case '}': d--; break; /* */
case '\\': if (s[1]) s++; /* */
} /* */
} /* */
if (*s) s++; /* */
break; /* */
case '{': /* */
d = 1; /* */
while (*++s && d > 0) /* */
{ switch (*s) /* */
{ case '{': d++; break; /* */
case '}': d--; break; /* */
case '\\': if (s[1]) s++; /* */
} /* */
} /* */
if (*s) s++; /* */
break; /* */
default: /* */
if (is_allowed(*s)) /* */
{ Symbol mac = sym_extract(&s, false); /* */
/* */
for (r = strings; /* */
r != RecordNULL; /* */
r = NextRecord(r)) /* */
{ if (*RecordHeap(r) == mac && /* */
RecordIsMARKED(r)) /* */
{ ClearRecordMARK(r); /* */
fput_record(file, /* */
r, /* */
db, /* */
(String)"@"); /* */
/* */
preprint_string(file, /* */
db, /* */
strings, /* */
r); /* */
} /* */
} /* */
} /* */
else s++; /* */
} /* */
} /* */
} /* */
} /* */
} /*------------------------*/
/*-----------------------------------------------------------------------------
** Function*: print_strings()
** Type: void
** Purpose:
**
** Arguments:
** file the target file
** db the database
** allp the indicator to include all
** Returns: nothing
**___________________________________________________ */
static void print_strings(file, db, allp) /* */
FILE *file; /* */
DB db; /* */
bool allp; /* */
{ Record strings = DBstring(db); /* */
Record rec; /* */
/* */
if (strings == RecordNULL) return; /* */
/* */
while (PrevRecord(strings)) /* find beginning */
{ strings = PrevRecord(strings); } /* of strings */
/* */
if (allp) /* */
{ /* */
for (rec = strings; /* */
rec != RecordNULL; /* */
rec = NextRecord(rec)) /* */
{ SetRecordMARK(rec); } /* */
} /* */
else /* */
{ int i; /* */
/* */
for (rec = strings; /* reset all marks */
rec != RecordNULL; /* */
rec = NextRecord(rec)) /* */
{ ClearRecordMARK(rec); } /* */
/* */
if ((rec=DBnormal(db)) != RecordNULL) /* */
{ /* */
while (PrevRecord(rec)) rec = PrevRecord(rec);/* */
/* */
for ( ; /* */
rec != RecordNULL; /* */
rec = NextRecord(rec)) /* */
{ /* */
if (!RecordIsDELETED(rec)) /* */
{ /* */
for (i = 2; i < RecordFree(rec); i += 2) /* */
{ if (RecordHeap(rec)[i] != NULL) /* */
{ mark_string(strings, /* */
SymbolValue(RecordHeap(rec)[i+1]));/* */
} /* */
} /* */
} /* */
} /* */
/* */
for (rec = strings; /* mark the dependencies */
rec != RecordNULL; /* from within strings */
rec = NextRecord(rec)) /* */
{ /* */
if (RecordIsMARKED(rec)) /* */
{ /* */
for (i = 1; i < RecordFree(rec); i++) /* */
{ if (RecordHeap(rec)[i] != NULL) /* */
{ mark_string(strings, /* */
SymbolValue(RecordHeap(rec)[i]));/* */
} /* */
} /* */
} /* */
} /* */
} /* */
} /* */
/* */
for (rec = strings; /* */
rec != RecordNULL; /* */
rec = NextRecord(rec)) /* */
{ /* */
if (!RecordIsDELETED(rec) && /* */
RecordIsMARKED(rec)) /* */
{ preprint_string(file, db, strings, rec); } /* */
} /* */
/* */
print_segment(file, db, strings, false); /* */
} /*------------------------*/
/*-----------------------------------------------------------------------------
** Function: print_db()
** Purpose: Print a database to a file in a way which is readable by
** \BibTeX. The spec determines which parts should be
** printed and the order of this parts. The spec is
** processed from left to right. Each unknown character
** is silently ignored. The following characters
** correspond to parts of the database:
** \begin{description}
** \item [p] The preamble.
** \item [\$] All strings (macros) contained in the database.
** \item [S] The strings (macros) which are used in the
** database.
** \item [s] The strings (macros) contained in the database
** where the resource print.all.strings determines
** whether all strings should be printed or the used
** strings only.
** \item [n] The normal records.
** \item [c] The comments.
** \item [i] The includes.
** \item [a] The aliases.
** \item [m] The modifies.
** \end{description}
** Upper-case letters which are not mentioned are silently folded
** to their lower-case counterparts.
** Arguments:
** file The file handle for printing.
** db The database to print
** spec String containing the specification of the parts to print.
** Returns: nothing
**___________________________________________________ */
void print_db(file,db,spec) /* */
FILE *file; /* */
DB db; /* */
char *spec; /* */
{ /* */
while (*spec) /* */
{ switch (*(spec++)) /* */
{ case 'p': case 'P': /* */
print_segment(file, db, DBpreamble(db), true);/* */
break; /* */
case 'n': case 'N': /* */
print_segment(file, db, DBnormal(db), true);/* */
break; /* */
case 's': /* */
print_strings(file, db, rsc_all_macs); /* */
break; /* */
case '$': /* */
print_strings(file, db, true); /* */
break; /* */
case 'S': /* */
print_strings(file, db, false); /* */
break; /* */
case 'c': case 'C': /* */
print_segment(file, db, DBcomment(db), true);/* */
break; /* */
case 'i': case 'I': /* */
print_segment(file, db, DBinclude(db), true);/* */
break; /* */
case 'a': case 'A': /* */
print_segment(file, db, DBalias(db), true);/* */
break; /* */
case 'm': case 'M': /* */
print_segment(file, db, DBmodify(db), true);/* */
break; /* */
} /* */
} /* */
} /*------------------------*/
/*-----------------------------------------------------------------------------
** Function: delete_record()
** Purpose: Delete a record from a database.
** It is not checked, that the record really is part of the
** database. The record is just unlinked from its
** list. Just in case the record should be the first one
** the database record is modified.
** Arguments:
** db Database containing |rec|.
** rec Record to delete.
** Returns: nothing
**___________________________________________________ */
void delete_record(db,rec) /* */
DB db; /* */
Record rec; /* */
{ Record *rp; /* */
/* */
switch (RecordType(rec)) /* */
{ case BIB_PREAMBLE: rp = &DBpreamble(db); break;/* */
case BIB_STRING: rp = &DBstring(db); break;/* */
case BIB_COMMENT: rp = &DBcomment(db); break;/* */
case BIB_MODIFY: rp = &DBmodify(db); break;/* */
case BIB_INCLUDE: rp = &DBinclude(db); break;/* */
case BIB_ALIAS: rp = &DBalias(db); break;/* */
default: rp = &DBnormal(db); break;/* */
} /* */
if (rec == *rp) /* */
{ if (NextRecord(rec) != RecordNULL) /* */
{ *rp = NextRecord(rec); } /* */
else if (PrevRecord(rec) != RecordNULL) /* */
{ *rp = PrevRecord(rec); } /* */
else /* */
{ *rp = RecordNULL; } /* */
} /* */
if (PrevRecord(rec) != RecordNULL) /* */
{ NextRecord(PrevRecord(rec)) = NextRecord(rec); }/* */
if (NextRecord(rec) != RecordNULL) /* */
{ PrevRecord(NextRecord(rec)) = PrevRecord(rec); }/* */
free_1_record(rec); /* */
} /*------------------------*/
/*-----------------------------------------------------------------------------
** Function: db_forall()
** Purpose: Visit all normal records in the data base and apply the given
** function |fct| to each.
** If this function returns |true| then no more records need to
** be visited.
** No special order can be assumed in which the records are seen.
** Arguments:
** fct Boolean valued function determining the end of the
** processing. It takes two arguments a |DB| and a |Record|.
** Returns: nothing
**___________________________________________________ */
void db_forall(db,fct) /* */
DB db; /* */
bool (*fct)_ARG((DB,Record)); /* Function pointer */
{ register Record rec, next; /* */
/* */
if (DBnormal(db) == RecordNULL) return; /* */
/* */
for (rec = DBnormal(db); /* */
rec != RecordNULL; /* */
rec = next) /* */
{ next = NextRecord(rec); /* */
if (!RecordIsDELETED(rec) && /* */
(*fct)(db,rec)) return; /* */
} /* */
/* */
for (rec = PrevRecord(DBnormal(db)); /* */
rec != RecordNULL; /* */
rec = next) /* */
{ next = PrevRecord(rec); /* */
if (!RecordIsDELETED(rec) && /* */
(*fct)(db,rec)) return; /* */
} /* */
} /*------------------------*/
/*-----------------------------------------------------------------------------
** Function: db_find()
** Purpose: Search the database for a record with a given key.
** If |RecordOldKey| is set for the record then use this value.
** Otherwise use |*Heap|. |*Heap| contains the reference
** key of normal records.
**
** Deleted records are ignored. An arbitrary matching
** record is returned. Thus if more than one record have
** the same key then the behavior is nondeterministic.
** Arguments:
** db Database to search in.
** key the key to search for
** Returns: the record found or |NULL| if none is found
**___________________________________________________ */
Record db_find(db,key) /* */
DB db; /* */
Symbol key; /* */
{ register Record rec; /* */
/* */
DebugPrint2("Finding... ", SymbolValue(key)); /* */
/* */
if (DBnormal(db) == RecordNULL) return RecordNULL;/* */
/* */
for (rec = DBnormal(db); /* */
rec != RecordNULL; /* */
rec = NextRecord(rec)) /* */
{ /* */
if (!RecordIsDELETED(rec)) /* */
{ if (RecordOldKey(rec) != NULL) /* */
{ if (RecordOldKey(rec) == key) return rec; /* */
} /* */
else if (*RecordHeap(rec) == key) return rec;/* */
} /* */
} /* */
/* */
for (rec = PrevRecord(DBnormal(db)); /* */
rec != RecordNULL; /* */
rec = PrevRecord(rec)) /* */
{ /* */
if (!RecordIsDELETED(rec)) /* */
{ if (RecordOldKey(rec) != NULL) /* */
{ if (RecordOldKey(rec) == key) return rec; /* */
} /* */
else if (*RecordHeap(rec) == key) return rec;/* */
} /* */
} /* */
return RecordNULL; /* */
} /*------------------------*/
/*-----------------------------------------------------------------------------
** Function: db_search()
** Purpose: Search the database for a record with a given key.
** If |RecordOldKey| is set for the record then use this value.
** Otherwise use |*Heap|. |*Heap| contains the reference
** key of normal records.
**
** Deleted records are not ignored! An arbitrary matching
** record is returned. Thus if more than one record have
** the same key then the behavior is nondeterministic.
** Arguments:
** db Database to search in.
** key the key to search for
** Returns: the record found or |NULL| if none is found
**___________________________________________________ */
Record db_search(db, key) /* */
DB db; /* */
Symbol key; /* */
{ register Record rec; /* */
/* */
if (DBnormal(db) == RecordNULL) return RecordNULL;/* */
/* */
for (rec = DBnormal(db); /* */
rec != RecordNULL; /* */
rec = NextRecord(rec)) /* */
{ if (RecordOldKey(rec) != NO_SYMBOL) /* */
{ if (RecordOldKey(rec) == key) return rec; } /* */
else if (*RecordHeap(rec) == key) return rec; /* */
} /* */
/* */
for (rec = PrevRecord(DBnormal(db)); /* */
rec != RecordNULL; /* */
rec = PrevRecord(rec)) /* */
{ if (RecordOldKey(rec) != NULL) /* */
{ if (RecordOldKey(rec) == key) return rec; } /* */
else if (*RecordHeap(rec) == key) return rec; /* */
} /* */
return RecordNULL; /* */
} /*------------------------*/
/*-----------------------------------------------------------------------------
** Function: db_new_key()
** Purpose: Search the database for a record with a given old key and
** return the new one.
** Arguments:
** db Database to search in.
** key Key to find.
** Returns: nothing
**___________________________________________________ */
Symbol db_new_key(db, key) /* */
DB db; /* */
Symbol key; /* */
{ register Record rec; /* */
/* */
if (DBnormal(db) == RecordNULL) return NULL; /* */
/* */
for (rec = DBnormal(db); /* */
rec != RecordNULL; /* */
rec = NextRecord(rec)) /* */
{ /* */
if (RecordOldKey(rec) != NULL && /* */
RecordOldKey(rec) == key) /* */
return *RecordHeap(rec); /* */
} /* */
/* */
for (rec = PrevRecord(DBnormal(db)); /* */
rec != RecordNULL; /* */
rec = PrevRecord(rec)) /* */
{ /* */
if (RecordOldKey(rec) != NULL && /* */
RecordOldKey(rec) == key) /* */
return *RecordHeap(rec); /* */
} /* */
return NULL; /* */
} /*------------------------*/
/*-----------------------------------------------------------------------------
** Function: db_rewind()
** Purpose: Rewind the normal records of a database to point to the first
** record if at least one records exists. Otherwise nothing is
** done.
** Arguments:
** db Database to rewind.
** Returns: nothing
**___________________________________________________ */
void db_rewind(db) /* */
DB db; /* */
{ /* */
if (DBnormal(db) == RecordNULL) return; /* */
/* */
while (PrevRecord(DBnormal(db)) != RecordNULL) /* */
{ DBnormal(db) = PrevRecord(DBnormal(db)); } /* */
} /*------------------------*/
/*-----------------------------------------------------------------------------
** Function*: rec__sort()
** Purpose:
**
** Arguments:
** rec the record
** less the comparator
** Returns:
**___________________________________________________ */
static Record rec__sort(rec,less) /* */
Record rec; /* */
int (*less)_ARG((Record,Record)); /* Function pointer */
{ Record r; /* */
Record new; /* */
/* */
if (rec == RecordNULL) return rec; /* */
r = RecordNULL ; /* */
/* */
while (PrevRecord(rec) != RecordNULL) /* */
{ rec = PrevRecord(rec); } /* */
/* */
while (rec != RecordNULL) /* */
{ new = rec; /* */
rec = NextRecord(rec); /* */
r = insert_record(new,r,less); /* */
} /* */
return r; /* */
} /*------------------------*/
/*-----------------------------------------------------------------------------
** The sorting uses a variant of insertion sort.
** Thus the major task is performed in this function, which is called to store
** a record.
** The Record structure contains two pointers to the same type. With those
** pointers a double linked list is established. sort_rec is either NULL ---
** if no record is stored --- or it is a pointer to some element in the
** ORDERED list:
**
** +------+ +------+ +------+ +------+ +------+ +------+
** -->|Record|-->|Record|-->|Record|-->|Record|-->|Record|-->|Record|-->
** <--| |<--| |<--| |<--| |<--| |<--| |<--
** +------+ +------+ +------+ +------+ +------+ +------+
** ^
** db_______|
**
** With this picture in mind it's obvious what's to be done.
** There are two major cases. To find the right position to insert the new
** record
** - either the pointer has to be moved leftward
** - or the pointer has to be moved rightward
**
** Special cases have to be considered if the new record is to be inserted
** before the first or after the last element in the list.
**
** The rest is simply leg work.
**
** Well, a word on the complexity.
** If the input is almost sorted (correct or in reverse order) then the
** algorithm is linear.
** In the worst case the algorithm is quadratic. This worst case looks as
** follows:
** A record has to be inserted which is smaller than the least element in the
** list. Afterwards one which is greater than the largest.
**
** NOTE: CURRENTLY THE ALGORITHM IS NOT STABLE:
** Records with the same key may get mixed in the sorted list.
**___________________________________________________ */
static Record insert_record(rec,ptr,less) /* */
register Record rec; /* */
register Record ptr; /* */
int (*less)_ARG((Record,Record)); /* Function pointer */
{ /* */
if (ptr == RecordNULL) { /* List is empty */
PrevRecord(rec) = RecordNULL; /* */
NextRecord(rec) = RecordNULL; /* */
return rec; /* */
} /* */
/* */
if ((*less)(rec,ptr)) /* */
{ /* */
while (PrevRecord(ptr) != RecordNULL) /* Move leftward. */
{ ptr = PrevRecord(ptr); /* */
if (!(*less)(rec,ptr)) /* */
{ PrevRecord(rec) = ptr; /* Insert */
NextRecord(rec) = NextRecord(ptr);/* */
PrevRecord(NextRecord(rec))= rec; /* */
NextRecord(ptr) = rec; /* */
return rec; /* */
} /* */
} /* */
PrevRecord(ptr) = rec; /* Insert before the first*/
NextRecord(rec) = ptr; /* */
PrevRecord(rec) = RecordNULL; /* */
} /* */
else /* */
{ /* */
while (NextRecord(ptr) != RecordNULL) /* Move rightward. */
{ ptr = NextRecord(ptr); /* */
if ((*less)(rec,ptr)) /* */