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Sources for the libgdbm library reside in src/.
Sources for building accompanying tools are moved to the tools/
subdirectory.
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* src/Makefile.am (libgdbmapp_a_SOURCES): Add wordwrap.c
* src/wordwrap.c: New file.
* tests/Makefile.am: Add t_wordwrap and wordspit.at
* tests/testsuite.at: Add new test.
* tests/t_wordwrap.c: New file.
* src/gdbmshell.c (help_handler): Use wordwrap functions.
* src/parseopt.c: Rewrite help output using wordwrap.
Add support for the ARGP_HELP_FMT environment variable.
Make sure no empty strings are ever passed to gettext.
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* src/cachetree.c: Remove.
* src/Makefile.am: Remove cachetree.c
* doc/gdbm.texi: Document the changes.
* src/bucket.c (cache_tab_lookup_slot)
(cache_tab_resize): New function.
(cache_elem_new): Initialize ca_coll.
(cache_elem_free, cache_lookup)
(_gdbm_cache_init,_gdbm_cache_free): Rewrite with hash-based cache lookup.
(_gdbm_fetch_data): Remove unused function.
* src/gdbm.h.in (GDBM_GETDBFORMAT, GDBM_GETDIRDEPTH)
(GDBM_GETBUCKETSIZE, GDBM_GETCACHEAUTO, GDBM_SETCACHEAUTO): New option codes.
* src/gdbmdefs.h (cache_node): Remove.
(cache_elem): Remove ca_node. Add ca_coll (collision resolution pointer).
(gdbm_file_info): New members: cache_auto, cache_bits, cache.
* src/gdbmopen.c (gdbm_fd_open): Change cache initialization.
* src/gdbmsetopt.c (GDBM_GETDBFORMAT,GDBM_GETDIRDEPTH)
(GDBM_GETBUCKETSIZE,GDBM_GETCACHEAUTO)
(GDBM_SETCACHEAUTO): Implement new options.
(setopt_gdbm_getflags): Reflect the state of GDBM_CLOEXEC and GDBM_NUMSYNC.
* src/proto.h (_gdbm_fetch_data,_gdbm_cache_tree_alloc)
(_gdbm_cache_tree_destroy,_gdbm_cache_tree_delete)
(_gdbm_cache_tree_lookup): Remove protos.
* src/recover.c (_gdbm_finish_transfer): Restore original cache settings.
* tests/Makefile.am: Add new test.
* tests/testsuite.at: Likewise.
* tests/gtcacheopt.c: New file.
* tests/setopt02.at: New test case.
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* src/Makefile.am (libgdbmapp_a_SOURCES): Add input-std.c
* src/gdbmshell.c (input_history_begin): Improve diagnostic message.
* src/gdbmtool.c (instream_default_create): New define.
(gdbmtool_init): Use instream_default_create.
* src/gdbmtool.h [WITH_READLINE] (instream_readline_create_: New proto.
(input_stream_name): New proto.
* src/input-rl.c (instream_stdin_create): Rename to instream_readline_create.
Fall back to instream_stdin_create if stdin is not connected to a tty.
* src/lex.l (input_stream_name): New function.
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* src/Makefile.am (libgdbmapp_a_SOURCES): Move gdbm shell
support to the library.
* src/gdbmtool.c: Move shell support to another file.
* src/gdbmtool.h (file_descr): New extern.
(gdbmshell, gdbmshell_run)
(variables_init, variables_free): New functions.
* src/gdbmtool.supp: New file.
* src/var.c (VAR_IS_SET): Change definition.
(variable): New member: init.
(variable_set): Change meaning of VARF_INIT.
(variables_free,variables_init): New protos.
* src/gdbmtool.c: New file.
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* src/input-null.c: New file.
* src/Makefile.am: Add input-null.c
* src/mem.c (e2nrealloc): New function.
* src/gdbmapp.h (e2nrealloc): New proto.
* src/gdbmtool.c (quit_handler): Exit from parser instead of
exiting from the program.
(param): Remove global.
(param_expand,param_push_arg,param_free): New functions for
handling parameters.
(param_free_argv): Take a single argument. Clear all
parameters up to argc.
(run_command): Rewrite parameter handling using new functions.
(main): Call input_init() after the input stream has been set
up.
Call yylex_destroy when finished.
* src/gdbmtool.h (instream_null_create): New proto.
(handler_param): Change type of argc to size_t. New field
argmax.
(HANDLER_PARAM_INITIALIZER): New define.
(yylex_destroy): New proto.
* src/input-rl.c (history_file_name): New static.
(get_history_file_name): Initialize history_file_name.
(input_init): Initialize input history only in interactive mode.
(input_done): Free input history only in interactive mode.
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* src/Makefile.am: Add avail.c
* src/avail.c: New file.
* src/gdbm.h.in (gdbm_avail_verify): New proto.
* src/gdbmdefs.h (GDBM_HEADER_AVAIL_SIZE): New macro.
* src/gdbmopen.c (gdbm_avail_table_valid_p)
(gdbm_avail_block_validate)
(gdbm_bucket_avail_table_validate): Move to avail.c
* src/gdbmtool.c (_gdbm_avail_list_size)
(_gdbm_print_avail_list): Rewrite using gdbm_avail_traverse.
* src/proto.h (gdbm_avail_traverse): New proto.
* src/systems.h: Include stddef.h.
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The new bucket cache uses the least recently used replacement
policy (instead of the least recently read, implemented previously).
It also allows for quick bucket lookups by the corresponding
disk address. To this effect the cache entries form a red-black
tree sorted by bucket address.
Additionally, data buckets are also cached.
* README: Describe the new branch.
* src/bucket.c: Rewrite cache support.
* src/cachetree.c: New file.
* src/Makefile.am: Add new file.
* src/findkey.c (_gdbm_read_entry): Use _gdbm_fetch_data.
This ensures data pages are cached as well as buckets.
* src/gdbm.h.in (GDBM_BUCKET_CACHE_CORRUPTED): New error code.
(gdbm_cache_stat): New struct.
(gdbm_get_cache_stats): New proto.
* src/gdbmclose.c (gdbm_close): Call _gdbm_cache_free to dispose
of the cache.
* src/gdbmdefs.h (cache_elem_color): New data type.
(cache_elem): New members: ca_left, ca_right, ca_node, and
ca_hits.
(cache_tree): New typedef.
(gdbm_file_info): Remove bucket_cache and last_read.
New fields: cache_num, cache_tree, cache_mru, cache_lru,
cache_avail, cache_access_count.
* src/gdbmerrno.c: Handle GDBM_BUCKET_CACHE_CORRUPTED.
* src/gdbmopen.c (gdbm_fd_open): Change cache initialization.
(_gdbm_init_cache, _gdbm_cache_entry_invalidate: Remove.
* src/gdbmsetopt.c (setopt_gdbm_setcachesize): Cache can be
re-initialized on the fly.
* src/gdbmtool.c: Change bucket printing routines.
* src/proto.h (_gdbm_read_bucket_at): Remove.
(_gdbm_fetch_data,_gdbm_cache_init,_gdbm_cache_free)
(_gdbm_cache_flush,_gdbm_cache_elem_new)
(_gdbm_cache_tree_alloc,_gdbm_cache_tree_destroy)
(_gdbm_cache_tree_delete,_gdbm_rbt_remove_node)
(_gdbm_cache_tree_lookup): New protos.
(_gdbm_init_cache,_gdbm_cache_entry_invalidate): Remove.
* src/recover.c (_gdbm_finish_transfer): Adapt to the new
cache structure.
* src/update.c: Likewise.
* tests/setopt00.at: Fix second GDBM_SETCACHESIZE test.
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* configure.ac: Version 1.5
* NEWS: Update.
* src/Makefile.am (VI_CURRENT): Increment to 6
* src/bucket.c (_gdbm_get_bucket): Fix the upper limit for
bucket_bits.
* src/falloc.c (push_avail_block): Fill the allocated block
with 0s.
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* src/input-std.c: Bugfix
* doc/gdbm.texi: Document changes.
* README: Update.
* configure.ac: New option --enable-gdbmtool-debug.
* src/Makefile.am: Conditionally augment AM_YFLAGS and
AM_LFLAGS with options that enable debugging.
* src/gdbmtool.c: Conditionally enable --lex-trace and
--gram-trace options.
* src/gram.y: Likewise.
* src/lex.l: Likewise.
* tests/Makefile.am: Remove architecure-dependent tests.
* tests/testsuite.at: Likewise.
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Commands can be supplied to gdbmtool in three ways:
1. From a file, using the --file (-f) option:
gdbmtool -f comfile
2. From the command line, if first argument is the database name:
gdbmtool test.db count \; fetch mykey \; avail
Note the use of semicolon to delimit commands.
3. From the interactive shell, if neither of the above is used.
* src/Makefile.am: Add new sources.
* src/gdbmtool.c: Use new stream functions for input.
* src/gdbmtool.h (setsource): Remove proto.
(instream_t): New data type.
(instream_name, instream_read)
(instream_close, instream_interactive)
(instream_eq): New functions.
(instream_stdin_create)
(instream_argv_create)
(instream_file_create)
(interactive, input_context_push): New protos.
* src/gram.y: Accept ; in place of newline.
* src/input-argv.c: New file.
* src/input-file.c: New file.
* src/input-rl.c: Rewrite to provide instream_t API.
* src/input-std.c: Likewise.
* src/lex.l: Rewrite.
* tests/.gitignore: Update.
* tests/Makefile.am: Add new tests. Incorporate
DejaGNU tests.
* tests/config/default.exp: New file.
* tests/gdbmtool/base.exp: New file.
* tests/gdbmtool00.at: New file.
* tests/gdbmtool01.at: New file.
* tests/gdbmtool02.at: New file.
* tests/testsuite.at: Include new tests.
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* src/Makefile.am: Add dependency for gram.h
Reported by Petr Ovtchenkov <ptr@void-ptr.info>
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* src/Makefile.am: Mark gdbm.h as noinst
* compat/Makefile.am (AM_CPPFLAGS): Make sure we pick up
../src/gdbm.h
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* configure.ac: Fix description wording.
* src/Makefile.am [GDBM_COND_DEBUG_ENABLE]: Don't
define GDBM_DEBUG_ENABLE.
* tests/Makefile.am: Likewise.
* src/debug.c (gdbm_debug_printer)
(gdbm_debug_flags): New globals.
(gdbm_debug_token, gdbm_debug_parse_state)
(gdbm_debug_datum): New functions.
* src/gdbm.h.in [@GDBM_DEBUG_ENABLE@]: Define GDBM_DEBUG_ENABLE.
(gdbm_debug_printer_t): New typedef.
(gdbm_debug_printer, gdbm_debug_flags): New externs.
(GDBM_DEBUG_ERR,GDBM_DEBUG_OPEN)
(GDBM_DEBUG_READ,GDBM_DEBUG_STORE)
(GDBM_DEBUG_LOOKUP,GDBM_DEBUG_ALL): New defines.
(gdbm_debug_token,gdbm_debug_parse_state)
(gdbm_debug_datum): New protos.
* src/gdbmdefs.h (GDBM_DEBUG,GDBM_DEBUG_DATUM): New macros.
* src/findkey.c: Add debugging info.
* src/gdbmfetch.c: Likewise.
* src/gdbmopen.c: Likewise.
* src/gdbmseq.c: Likewise.
* src/gdbmstore.c: Likewise.
* src/gdbmtool.c (open_handler): Allow the use of ~/
(command) <repeat,variadic>: New members.
(run_command): Handle variadic functions.
(run_last_command): New command. In interactive mode,
repeats the last command if it was marked
with repeat=1 (currently, only "next").
New command: "debug".
(all functions): Use terror instead of fprintf(stderr,...);
* src/gdbmtool.h (handler_param) <vararg>: New member.
(run_last_command): New proto.
* src/gram.y: Call run_last_command) on empty input.
* tests/gtload.c: New option: -debug=
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* configure.ac: New option --enable-debug
Print feature summary at the end of the run.
* src/debug.c: New file.
* src/Makefile.am [GDBM_COND_DEBUG_ENABLE]: Build debug.o
Define GDBM_DEBUG_ENABLE.
* src/gdbmdefs.h [GDBM_DEBUG_ENABLE] (_gdbm_debug_hook_install)
(_gdbm_debug_hook_remove,_gdbm_debug_hook_check)
(_gdbm_debug_hook_val): New protos.
(GDBM_DEBUG_HOOK, GDBM_DEBUG_OVERRIDE)
(GDBM_DEBUG_ALLOC): New defines.
* src/gdbm.h.in (GDBM_RCVR_FORCE): New flag.
* src/recover.c (gdbm_recover): Check database before attempting
recovery, unless GDBM_RCVR_FORCE flag is set.
* doc/gdbm.texi: Document GDBM_RCVR_FORCE
* src/gdbmreorg.c (gdbm_reorganize): Use GDBM_RCVR_FORCE.
* src/gdbmtool.c (main): Always allocate file_name.
* src/bucket.c: Put GDBM_DEBUG_OVERRIDE and GDBM_DEBUG_ALLOC
in critical places.
* src/falloc.c: Likewise.
* src/findkey.c: Likewise.
* src/gdbmopen.c: Likewise.
* src/gdbmstore.c: Likewise.
* src/update.c: Likewise.
* tests/Makefile.am [GDBM_COND_DEBUG_ENABLE]: Define GDBM_DEBUG_ENABLE.
* tests/gtload.c: New options -hook, -recover, -verbose,
-backup, -max-failures, -max-failed-keys,
and -max-failed-buckets.
Attempt recovery after errors.
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* configure.ac: Don't check for rename.
* src/Makefile.am (libgdbm_la_SOURCES): Add recover.c
* src/recover.c: New file.
* src/bucket.c (_gdbm_get_bucket): Remove extra space before [
* src/err.c (prerror): Take additional argument
(gdbm_perror): Print system errno if necessary.
* src/gdbm.h.in (GDBM_CLOERROR): New flag.
(gdbm_fd_open, gdbm_copy_meta): New proto.
(gdbm_last_syserr,gdbm_db_strerror,gdbm_recover): New proto.
(gdbm_syserr): New extern.
(gdbm_recovery): New struct.
(GDBM_RCVR_DEFAULT,GDBM_RCVR_ERRFUN)
(GDBM_RCVR_MAX_FAILED_KEYS)
(GDBM_RCVR_MAX_FAILED_BUCKETS)
(GDBM_RCVR_MAX_FAILURES)
(GDBM_RCVR_BACKUP): New flags.
(GDBM_BACKUP_FAILED): New error code.
* src/gdbmclose.c (gdbm_close): Work correctly if dbf->desc == -1.
* src/gdbmcount.c (gdbm_count): Remove spurious sorting.
Use _gdbm_next_bucket_dir for iterating over the buckets.
* src/gdbmdefs.h (struct gdbm_file_info)<last_syserror>
<last_errstr>: New members.
* src/gdbmerrno.c (gdbm_set_errno): Set last_syserror as well.
(gdbm_clear_error): Reset last_syserror.
(gdbm_last_syserr): New function.
(gdbm_errlist): New entry for GDBM_BACKUP_FAILED.
(gdbm_db_strerror): New function.
(gdbm_syserr): New global.
* src/gdbmload.c (get_parms): Buffer can be NULL.
* src/gdbmopen.c (gdbm_fd_open): New function.
(gdbm_open): Rewrite as a wrapper over gdbm_fd_open.
* src/gdbmreorg.c (gdbm_reorganize): Rewrite as a wrapper
over gdbm_recover.
* src/proto.h (_gdbm_next_bucket_dir): New proto.
* src/gdbmtool.c: New command: recover.
* tests/.gitignore: Add gtrecover
* tests/gtrecover.c: New test program.
* tests/Makefile.am: Build gtrecover
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* src/gdbm.magic: New file.
* README: Document existence of the magic file.
* src/Makefile.am (EXTRA_DIST): Add gdbm.magic.
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* configure.ac: Check if GNU Readline is available.
* src/Makefile.am: Add new files.
* src/input-rl.c: New file.
* src/input-std.c: New file.
* src/gdbmtool.c (handler_param): Move declaration to
the header file.
(quit_handler): Call input_done.
(command_tab): Add the "history" command.
(command_generator): New function.
(slist_new_s, slist_new_l)
(slist_insert): New functions.
(main): Call input_init and input_done.
* src/gdbmtool.h: New protos.
* src/gram.y: Use slist_insert to construct string lists.
* src/lex.l (read_input): Remove. Use input_read instead.
(print_prompt_at_bol): New function.
(print_prompt): Remove.
(make_prompt): New function.
* NEWS: Document changes.
* README: Document readline support.
* doc/gdbm.texi: Document line editing in gdbmtool.
* doc/gdbmtool.1: Likewise.
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* configure.ac: Check for unsigned long long, define
substitution variable GDBM_COUNT_T.
* src/gdbmcount.c: New file.
* src/Makefile.am (libgdbm_la_SOURCES): Add gdbmcount.c.
* src/bucket.c (_gdbm_read_bucket_at): New function.
* src/gdbm.h.in (gdbm_count_t): New typedef.
(gdbm_count): New proto.
* src/gdbmdefs.h (GDBM_DIR_COUNT): New define.
* src/proto.h (_gdbm_read_bucket_at): New proto.
* src/var.c: New variable "filemode".
* src/gdbmtool.c: Use gdbm_count. Various bugfixes.
* NEWS: Update.
* doc/gdbm.texinfo: Update.
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* src/util.c: New file.
* src/Makefile.am: Add new files.
* src/gdbmtool.c (open_mode): New variable.
(terror): Remove.
(mkfilename, tildexpand): Move to util.c
(opendb): Use open_mode.
(import_handler): Likewise.
(optab): New option -N (--norc).
* src/gdbmtool.h (vparse_error): Rename to vlerror.
(parse_error): Rename to lerror.
(syntax_error): Rename tp terror.
All uses updated.
(VAR_ERR_FAILURE): Remove.
(VAR_ERR_BADVALUE): New error code.
(variable_mode_name): Remove.
(mkfilename, tildexpand)
(vgetyn, getyn): New protos.
* src/lex.l (initialized): New static.
(setsource): Set initialized.
(vlerror): Print locus only if the lexer has been
initialized.
* src/var.c: Rewrite.
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* src/var.c: New file.
* src/datconv.c (datum_format): Remove the "delim"
parameter, use "delim1" and "delim2" shell variables
instead.
* src/gdbmtool.c: Remove "prompt" command. Use "set ps[12]"
instead.
(print_prompt): Move to lex.l
* src/gdbmtool.h (variable_set)
(variable_get, variable_print_all): New protos.
* src/gram.y: Handle the "set" command.
* src/lex.l: Update.
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* src/datconv.c: New file.
* src/Makefile.am (gdbmtool_SOURCES): Add datconv.c.
* src/gdbmtool.h (slist, kvpair): New structures.
(gdbmarg): Keep various types of data depending on the
value of the type member.
(slist_new, slist_free)
(kvpair_string, kvpair_list): New protos.
(gdbmarg_new): Remove.
(gdbmarg_string, gdbmarg_datum)
(gdbmarg_kvpair, gdbmarg_free)
(gdbmarg_destroy): New protos.
(xd_expand, xd_store, datadef_locate): New protos.
(field, dsegm): New structs.
(dsegm_new, dsegm_new_field, dsegm_free_list): New protos.
* src/gdbmtool.c: Rewrite.
* src/gram.y: Change grammar to allow for defining key and
content structure and for supplying structured data as arguments
to fetch, store and similar functions.
* src/lex.l: Handle new token types.
* tests/dtload.c (main): Fix parser.
* tests/gtload.c: Likewise.
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* src/testgdbm.c: Remove.
* src/gdbmtool.c: New file.
* src/gdbmtool.h: New file.
* src/gram.y: New file.
* src/lex.l: New file.
* src/Makefile.am: Update.
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* configure.ac: Fix a typo.
* src/.cvsignore: Add gdbmtool
* src/Makefile.am: Rename testgdbm to gdbmtool. Source
file not renamed because of CVS deficiency.
* src/gdbm_dump.c: Enable NLS.
* src/gdbm_load.c: Likewise.
* src/testgdbm.c: New option -q (--quiet).
New command: prompt.
* doc/Makefile.am (man_MANS): Add new manpages.
* doc/gdbmtool.1: New file.
* doc/gdbm_load.1: New file.
* doc/gdbm_dump.1: New file.
* doc/gdbm.3: Update.
* doc/gdbm.texinfo: Update.
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* configure.ac (AC_CHECK_HEADERS): Don't check for files that must
always be present. Check for getopt.h.
(AC_CHECK_FUNCS): Add getopt_long
* src/systems.h: Include useless #if's.
* src/flatfile.c: Split into two files:
* src/gdbmexp.c: ... this and ...
* src/gdbmimp.c: .., this
* src/mem.c: New file.
* src/base64.c: New file.
* src/gdbm_dump.c: New file.
* src/gdbm_load.c: New file.
* src/gdbmapp.h: New file.
* src/gdbmdump.c: New file.
* src/gdbmload.c: New file.
* src/parseopt.c: New file.
* src/progname.c: New file.
* src/.cvsignore: Update.
* src/Makefile.am (libgdbm_la_SOURCES): Add new files.
(noinst_LIBRARIES): New variable. Build libgdbmapp.a.
(libgdbmapp_a_SOURCES): New variable.
(bin_PROGRAMS): Add gdbm_load and gdbm_dump
(testgdbm_LDADD, gdbm_load_LDADD)
(gdbm_dump_LDADD): Add ./libgdbmapp.a
* src/gdbm.h.in: Include <stdio.h>
(gdbm_export_to_file)
(gdbm_import_from_file): New prototypes.
(GDBM_DUMP_FMT_BINARY,GDBM_DUMP_FMT_ASCII): New constants.
(gdbm_dump,gdbm_load)
(gdbm_dump_to_file,gdbm_load_from_file): New prototypes.
(GDBM_NO_DBNAME): New error code.
(_GDBM_MAX_ERRNO): Update.
* src/gdbmdefs.h (_GDBM_MAX_DUMP_LINE_LEN): New constant.
* src/gdbmerrno.c (gdbm_errlist): Add entry for GDBM_NO_DBNAME.
* src/proto.h (_gdbm_base64_encode,_gdbm_base64_decode)
(_gdbm_load,_gdbm_dump): New prototypes.
* src/testgdbm.c: Use gdbmapp interface for option parsing.
* export/export.c: Include gdbmexp.c
* export/.cvsignore: Update.
* doc/gdbm.texinfo: Update.
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* src/Makefile.am: Use libgdbm_la_LIBADD, not just LIBADD.
* src/testgdbm.c: Declare some function parameters with const qualifiers.
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Tolerate I/O operations returning less bytes than expected. Retry I/O
if possible.
* src/fullio.c: New file.
* src/Makefile.am (libgdbm_la_SOURCES): Add fullio.c
* src/proto.h (_gdbm_full_read)
(_gdbm_full_write): New protos.
* src/gdbmerrno.c (gdbm_errlist): Add entry for GDBM_FILE_EOF.
* src/bucket.c: Use _gdbm_full_{read|write}.
* src/falloc.c: Likewise.
* src/findkey.c: Likewise.
* src/gdbmopen.c: Likewise.
* src/gdbmstore.c: Likewise.
* src/testgdbm.c: Likewise.
* src/update.c: Likewise.
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* Makefile.am (SUBDIRS): Add po.
(EXTRA_DIST): Add build-aux/config.rpath.
* configure.ac (AC_CONFIG_FILES): Add po/Makefile.in.
* bootstrap: New file.
* src/Makefile.am (AM_CPPFLAGS): Define LOCALEDIR
(noinst_HEADERS): Add gettext.h
(LIBADD): New variable.
* src/gettext.h: New file.
* po/.cvsignore: New file.
* po/Makevars: New file.
* po/POTFILES.in: New file.
* src/gdbmdefs.h: Define DEFAULT_TEXT_DOMAIN, _, N_
Include gettext.h
* src/bucket.c: Add NLS markers.
* src/falloc.c: Likewise.
* src/findkey.c: Likewise.
* src/gdbmerrno.c: Likewise.
* src/gdbmfetch.c: Likewise.
* src/gdbmseq.c: Likewise.
* src/gdbmstore.c: Likewise.
* src/update.c: Likewise.
* src/testgdbm.c: Add NLS markers.
(main): Initialize I18N.
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(noinst_HEADERS): Install gdbm.h
(EXTRA_DIST): Distribute gdbm.h.in.
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_gdbm_unlock_file(), which will try to use flock(), lockf(), and fcntl() to
lock the file.
From ChangeLog:
* configure.ac: Add test for lockf.
* src/lock.c: New file, adds _gdbm_unlock_file() and
_gdbm_lock_file() routines. These attempt to use flock(),
lockf(), and fcntl() locking.
* src/proto.h: Add new prototypes.
* src/systems.h: Remove file locking macros.
* src/gdbmopen.c: Rewrite locking code, use _gdbm_lock_file().
* src/gdbmclose.c, src/gdbmreorg.c: Use _gdbm_unlock_file().
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