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ruby--ruby/ext/dbm/dbm.c
matz 1057902ac7 * io.c (read_all): block string buffer modification during 
rb_io_fread() by freezing it temporarily. [ruby-dev:24479]

* dir.c (rb_push_glob): block call at once the end of method.
  [ruby-dev:24487]

* ext/enumerator/enumerator.c (enum_each_slice): remove
  rb_gc_force_recycle() to prevent potential SEGV.
  [ruby-dev:24499]

* ext/zlib/zlib.c (zstream_expand_buffer): hide internal string
  buffer by clearing klass.  [ruby-dev:24510]

* ext/socket/socket.c (sock_s_getservbyaname): protocol string
  might be altered.  [ruby-dev:24503]

* string.c (rb_str_upto): check if return value from succ is a
  string.  [ruby-dev:24504]

* io.c (rb_io_popen): get mode string via rb_io_flags_mode() to
  avoid mode string modification.  [ruby-dev:24454]

* io.c (rb_io_getline_fast): should take delim as unsigned char to
  distinguish EOF and '\377'.  [ruby-dev:24460]

* io.c (rb_io_getline): add check for RS modification.
  [ruby-dev:24461]

* enum.c (enum_sort_by): use qsort() directly instead using
  rb_iterate().  [ruby-dev:24462]

* enum.c (enum_each_with_index): remove rb_gc_force_recycle() to
  prevent access to recycled object (via continuation for
  example).  [ruby-dev:24463]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@7071 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
2004-10-19 10:25:23 +00:00

779 lines
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/************************************************
dbm.c -
$Author$
$Date$
created at: Mon Jan 24 15:59:52 JST 1994
Copyright (C) 1995-2001 Yukihiro Matsumoto
************************************************/
#include "ruby.h"
#ifdef HAVE_CDEFS_H
# include <cdefs.h>
#endif
#ifdef HAVE_SYS_CDEFS_H
# include <sys/cdefs.h>
#endif
#include DBM_HDR
#include <fcntl.h>
#include <errno.h>
static VALUE rb_cDBM, rb_eDBMError;
#define RUBY_DBM_RW_BIT 0x20000000
struct dbmdata {
int di_size;
DBM *di_dbm;
};
static void
closed_dbm()
{
rb_raise(rb_eDBMError, "closed DBM file");
}
#define GetDBM(obj, dbmp) {\
Data_Get_Struct(obj, struct dbmdata, dbmp);\
if (dbmp == 0) closed_dbm();\
if (dbmp->di_dbm == 0) closed_dbm();\
}
static void
free_dbm(dbmp)
struct dbmdata *dbmp;
{
if (dbmp) {
if (dbmp->di_dbm) dbm_close(dbmp->di_dbm);
free(dbmp);
}
}
static VALUE
fdbm_close(obj)
VALUE obj;
{
struct dbmdata *dbmp;
GetDBM(obj, dbmp);
dbm_close(dbmp->di_dbm);
dbmp->di_dbm = 0;
return Qnil;
}
static VALUE fdbm_alloc _((VALUE));
static VALUE
fdbm_alloc(klass)
VALUE klass;
{
return Data_Wrap_Struct(klass, 0, free_dbm, 0);
}
static VALUE
fdbm_initialize(argc, argv, obj)
int argc;
VALUE *argv;
VALUE obj;
{
VALUE file, vmode, vflags;
DBM *dbm;
struct dbmdata *dbmp;
int mode, flags = 0;
if (rb_scan_args(argc, argv, "12", &file, &vmode, &vflags) == 1) {
mode = 0666; /* default value */
}
else if (NIL_P(vmode)) {
mode = -1; /* return nil if DB not exist */
}
else {
mode = NUM2INT(vmode);
}
if (!NIL_P(vflags))
flags = NUM2INT(vflags);
SafeStringValue(file);
if (flags & RUBY_DBM_RW_BIT) {
flags &= ~RUBY_DBM_RW_BIT;
dbm = dbm_open(RSTRING(file)->ptr, flags, mode);
}
else {
dbm = 0;
if (mode >= 0) {
dbm = dbm_open(RSTRING(file)->ptr, O_RDWR|O_CREAT, mode);
}
if (!dbm) {
dbm = dbm_open(RSTRING(file)->ptr, O_RDWR, 0);
}
if (!dbm) {
dbm = dbm_open(RSTRING(file)->ptr, O_RDONLY, 0);
}
}
if (!dbm) {
if (mode == -1) return Qnil;
rb_sys_fail(RSTRING(file)->ptr);
}
dbmp = ALLOC(struct dbmdata);
DATA_PTR(obj) = dbmp;
dbmp->di_dbm = dbm;
dbmp->di_size = -1;
return obj;
}
static VALUE
fdbm_s_open(argc, argv, klass)
int argc;
VALUE *argv;
VALUE klass;
{
VALUE obj = Data_Wrap_Struct(klass, 0, free_dbm, 0);
if (NIL_P(fdbm_initialize(argc, argv, obj))) {
return Qnil;
}
if (rb_block_given_p()) {
return rb_ensure(rb_yield, obj, fdbm_close, obj);
}
return obj;
}
static VALUE
fdbm_fetch(obj, keystr, ifnone)
VALUE obj, keystr, ifnone;
{
datum key, value;
struct dbmdata *dbmp;
DBM *dbm;
StringValue(keystr);
key.dptr = RSTRING(keystr)->ptr;
key.dsize = RSTRING(keystr)->len;
GetDBM(obj, dbmp);
dbm = dbmp->di_dbm;
value = dbm_fetch(dbm, key);
if (value.dptr == 0) {
if (ifnone == Qnil && rb_block_given_p())
return rb_yield(rb_tainted_str_new(key.dptr, key.dsize));
return ifnone;
}
return rb_tainted_str_new(value.dptr, value.dsize);
}
static VALUE
fdbm_aref(obj, keystr)
VALUE obj, keystr;
{
return fdbm_fetch(obj, keystr, Qnil);
}
static VALUE
fdbm_fetch_m(argc, argv, obj)
int argc;
VALUE *argv;
VALUE obj;
{
VALUE keystr, valstr, ifnone;
rb_scan_args(argc, argv, "11", &keystr, &ifnone);
valstr = fdbm_fetch(obj, keystr, ifnone);
if (argc == 1 && !rb_block_given_p() && NIL_P(valstr))
rb_raise(rb_eIndexError, "key not found");
return valstr;
}
static VALUE
fdbm_index(obj, valstr)
VALUE obj, valstr;
{
datum key, val;
struct dbmdata *dbmp;
DBM *dbm;
StringValue(valstr);
val.dptr = RSTRING(valstr)->ptr;
val.dsize = RSTRING(valstr)->len;
GetDBM(obj, dbmp);
dbm = dbmp->di_dbm;
for (key = dbm_firstkey(dbm); key.dptr; key = dbm_nextkey(dbm)) {
val = dbm_fetch(dbm, key);
if (val.dsize == RSTRING(valstr)->len &&
memcmp(val.dptr, RSTRING(valstr)->ptr, val.dsize) == 0) {
return rb_tainted_str_new(key.dptr, key.dsize);
}
}
return Qnil;
}
static VALUE
fdbm_select(obj)
VALUE obj;
{
VALUE new = rb_ary_new();
int i;
datum key, val;
DBM *dbm;
struct dbmdata *dbmp;
GetDBM(obj, dbmp);
dbm = dbmp->di_dbm;
for (key = dbm_firstkey(dbm); key.dptr; key = dbm_nextkey(dbm)) {
VALUE assoc;
val = dbm_fetch(dbm, key);
assoc = rb_assoc_new(rb_tainted_str_new(key.dptr, key.dsize),
rb_tainted_str_new(val.dptr, val.dsize));
if (RTEST(rb_yield(assoc)))
rb_ary_push(new, assoc);
}
return new;
}
static VALUE
fdbm_values_at(argc, argv, obj)
int argc;
VALUE *argv;
VALUE obj;
{
VALUE new = rb_ary_new2(argc);
int i;
for (i=0; i<argc; i++) {
rb_ary_push(new, fdbm_fetch(obj, argv[i], Qnil));
}
return new;
}
static void
fdbm_modify(obj)
VALUE obj;
{
rb_secure(4);
if (OBJ_FROZEN(obj)) rb_error_frozen("DBM");
}
static VALUE
fdbm_delete(obj, keystr)
VALUE obj, keystr;
{
datum key, value;
struct dbmdata *dbmp;
DBM *dbm;
VALUE valstr;
fdbm_modify(obj);
StringValue(keystr);
key.dptr = RSTRING(keystr)->ptr;
key.dsize = RSTRING(keystr)->len;
GetDBM(obj, dbmp);
dbm = dbmp->di_dbm;
value = dbm_fetch(dbm, key);
if (value.dptr == 0) {
if (rb_block_given_p()) return rb_yield(keystr);
return Qnil;
}
/* need to save value before dbm_delete() */
valstr = rb_tainted_str_new(value.dptr, value.dsize);
if (dbm_delete(dbm, key)) {
dbmp->di_size = -1;
rb_raise(rb_eDBMError, "dbm_delete failed");
}
else if (dbmp->di_size >= 0) {
dbmp->di_size--;
}
return valstr;
}
static VALUE
fdbm_shift(obj)
VALUE obj;
{
datum key, val;
struct dbmdata *dbmp;
DBM *dbm;
VALUE keystr, valstr;
fdbm_modify(obj);
GetDBM(obj, dbmp);
dbm = dbmp->di_dbm;
dbmp->di_size = -1;
key = dbm_firstkey(dbm);
if (!key.dptr) return Qnil;
val = dbm_fetch(dbm, key);
keystr = rb_tainted_str_new(key.dptr, key.dsize);
valstr = rb_tainted_str_new(val.dptr, val.dsize);
dbm_delete(dbm, key);
return rb_assoc_new(keystr, valstr);
}
static VALUE
fdbm_delete_if(obj)
VALUE obj;
{
datum key, val;
struct dbmdata *dbmp;
DBM *dbm;
VALUE keystr, valstr;
VALUE ret, ary = rb_ary_new();
int i, status = 0, n;
fdbm_modify(obj);
GetDBM(obj, dbmp);
dbm = dbmp->di_dbm;
n = dbmp->di_size;
dbmp->di_size = -1;
for (key = dbm_firstkey(dbm); key.dptr; key = dbm_nextkey(dbm)) {
val = dbm_fetch(dbm, key);
keystr = rb_tainted_str_new(key.dptr, key.dsize);
valstr = rb_tainted_str_new(val.dptr, val.dsize);
ret = rb_protect(rb_yield, rb_assoc_new(rb_str_dup(keystr), valstr), &status);
if (status != 0) break;
if (RTEST(ret)) rb_ary_push(ary, keystr);
}
for (i = 0; i < RARRAY(ary)->len; i++) {
keystr = RARRAY(ary)->ptr[i];
key.dptr = RSTRING(keystr)->ptr;
key.dsize = RSTRING(keystr)->len;
if (dbm_delete(dbm, key)) {
rb_raise(rb_eDBMError, "dbm_delete failed");
}
}
if (status) rb_jump_tag(status);
if (n > 0) dbmp->di_size = n - RARRAY(ary)->len;
return obj;
}
static VALUE
fdbm_clear(obj)
VALUE obj;
{
datum key;
struct dbmdata *dbmp;
DBM *dbm;
fdbm_modify(obj);
GetDBM(obj, dbmp);
dbm = dbmp->di_dbm;
dbmp->di_size = -1;
while (key = dbm_firstkey(dbm), key.dptr) {
if (dbm_delete(dbm, key)) {
rb_raise(rb_eDBMError, "dbm_delete failed");
}
}
dbmp->di_size = 0;
return obj;
}
static VALUE
fdbm_invert(obj)
VALUE obj;
{
datum key, val;
struct dbmdata *dbmp;
DBM *dbm;
VALUE keystr, valstr;
VALUE hash = rb_hash_new();
GetDBM(obj, dbmp);
dbm = dbmp->di_dbm;
for (key = dbm_firstkey(dbm); key.dptr; key = dbm_nextkey(dbm)) {
val = dbm_fetch(dbm, key);
keystr = rb_tainted_str_new(key.dptr, key.dsize);
valstr = rb_tainted_str_new(val.dptr, val.dsize);
rb_hash_aset(hash, valstr, keystr);
}
return hash;
}
static VALUE each_pair _((VALUE));
static VALUE
each_pair(obj)
VALUE obj;
{
return rb_funcall(obj, rb_intern("each_pair"), 0, 0);
}
static VALUE fdbm_store _((VALUE,VALUE,VALUE));
static VALUE
update_i(pair, dbm)
VALUE pair, dbm;
{
Check_Type(pair, T_ARRAY);
if (RARRAY(pair)->len < 2) {
rb_raise(rb_eArgError, "pair must be [key, value]");
}
fdbm_store(dbm, RARRAY(pair)->ptr[0], RARRAY(pair)->ptr[1]);
return Qnil;
}
static VALUE
fdbm_update(obj, other)
VALUE obj, other;
{
rb_iterate(each_pair, other, update_i, obj);
return obj;
}
static VALUE
fdbm_replace(obj, other)
VALUE obj, other;
{
fdbm_clear(obj);
rb_iterate(each_pair, other, update_i, obj);
return obj;
}
static VALUE
fdbm_store(obj, keystr, valstr)
VALUE obj, keystr, valstr;
{
datum key, val;
struct dbmdata *dbmp;
DBM *dbm;
fdbm_modify(obj);
keystr = rb_obj_as_string(keystr);
key.dptr = RSTRING(keystr)->ptr;
key.dsize = RSTRING(keystr)->len;
valstr = rb_obj_as_string(valstr);
val.dptr = RSTRING(valstr)->ptr;
val.dsize = RSTRING(valstr)->len;
GetDBM(obj, dbmp);
dbmp->di_size = -1;
dbm = dbmp->di_dbm;
if (dbm_store(dbm, key, val, DBM_REPLACE)) {
#ifdef HAVE_DBM_CLEARERR
dbm_clearerr(dbm);
#endif
if (errno == EPERM) rb_sys_fail(0);
rb_raise(rb_eDBMError, "dbm_store failed");
}
return valstr;
}
static VALUE
fdbm_length(obj)
VALUE obj;
{
datum key;
struct dbmdata *dbmp;
DBM *dbm;
int i = 0;
GetDBM(obj, dbmp);
if (dbmp->di_size > 0) return INT2FIX(dbmp->di_size);
dbm = dbmp->di_dbm;
for (key = dbm_firstkey(dbm); key.dptr; key = dbm_nextkey(dbm)) {
i++;
}
dbmp->di_size = i;
return INT2FIX(i);
}
static VALUE
fdbm_empty_p(obj)
VALUE obj;
{
datum key;
struct dbmdata *dbmp;
DBM *dbm;
int i = 0;
GetDBM(obj, dbmp);
if (dbmp->di_size < 0) {
dbm = dbmp->di_dbm;
for (key = dbm_firstkey(dbm); key.dptr; key = dbm_nextkey(dbm)) {
i++;
}
}
else {
i = dbmp->di_size;
}
if (i == 0) return Qtrue;
return Qfalse;
}
static VALUE
fdbm_each_value(obj)
VALUE obj;
{
datum key, val;
struct dbmdata *dbmp;
DBM *dbm;
GetDBM(obj, dbmp);
dbm = dbmp->di_dbm;
for (key = dbm_firstkey(dbm); key.dptr; key = dbm_nextkey(dbm)) {
val = dbm_fetch(dbm, key);
rb_yield(rb_tainted_str_new(val.dptr, val.dsize));
}
return obj;
}
static VALUE
fdbm_each_key(obj)
VALUE obj;
{
datum key;
struct dbmdata *dbmp;
DBM *dbm;
GetDBM(obj, dbmp);
dbm = dbmp->di_dbm;
for (key = dbm_firstkey(dbm); key.dptr; key = dbm_nextkey(dbm)) {
rb_yield(rb_tainted_str_new(key.dptr, key.dsize));
}
return obj;
}
static VALUE
fdbm_each_pair(obj)
VALUE obj;
{
datum key, val;
DBM *dbm;
struct dbmdata *dbmp;
VALUE keystr, valstr;
GetDBM(obj, dbmp);
dbm = dbmp->di_dbm;
for (key = dbm_firstkey(dbm); key.dptr; key = dbm_nextkey(dbm)) {
val = dbm_fetch(dbm, key);
keystr = rb_tainted_str_new(key.dptr, key.dsize);
valstr = rb_tainted_str_new(val.dptr, val.dsize);
rb_yield(rb_assoc_new(keystr, valstr));
}
return obj;
}
static VALUE
fdbm_keys(obj)
VALUE obj;
{
datum key;
struct dbmdata *dbmp;
DBM *dbm;
VALUE ary;
GetDBM(obj, dbmp);
dbm = dbmp->di_dbm;
ary = rb_ary_new();
for (key = dbm_firstkey(dbm); key.dptr; key = dbm_nextkey(dbm)) {
rb_ary_push(ary, rb_tainted_str_new(key.dptr, key.dsize));
}
return ary;
}
static VALUE
fdbm_values(obj)
VALUE obj;
{
datum key, val;
struct dbmdata *dbmp;
DBM *dbm;
VALUE ary;
GetDBM(obj, dbmp);
dbm = dbmp->di_dbm;
ary = rb_ary_new();
for (key = dbm_firstkey(dbm); key.dptr; key = dbm_nextkey(dbm)) {
val = dbm_fetch(dbm, key);
rb_ary_push(ary, rb_tainted_str_new(val.dptr, val.dsize));
}
return ary;
}
static VALUE
fdbm_has_key(obj, keystr)
VALUE obj, keystr;
{
datum key, val;
struct dbmdata *dbmp;
DBM *dbm;
StringValue(keystr);
key.dptr = RSTRING(keystr)->ptr;
key.dsize = RSTRING(keystr)->len;
GetDBM(obj, dbmp);
dbm = dbmp->di_dbm;
val = dbm_fetch(dbm, key);
if (val.dptr) return Qtrue;
return Qfalse;
}
static VALUE
fdbm_has_value(obj, valstr)
VALUE obj, valstr;
{
datum key, val;
struct dbmdata *dbmp;
DBM *dbm;
StringValue(valstr);
val.dptr = RSTRING(valstr)->ptr;
val.dsize = RSTRING(valstr)->len;
GetDBM(obj, dbmp);
dbm = dbmp->di_dbm;
for (key = dbm_firstkey(dbm); key.dptr; key = dbm_nextkey(dbm)) {
val = dbm_fetch(dbm, key);
if (val.dsize == RSTRING(valstr)->len &&
memcmp(val.dptr, RSTRING(valstr)->ptr, val.dsize) == 0)
return Qtrue;
}
return Qfalse;
}
static VALUE
fdbm_to_a(obj)
VALUE obj;
{
datum key, val;
struct dbmdata *dbmp;
DBM *dbm;
VALUE ary;
GetDBM(obj, dbmp);
dbm = dbmp->di_dbm;
ary = rb_ary_new();
for (key = dbm_firstkey(dbm); key.dptr; key = dbm_nextkey(dbm)) {
val = dbm_fetch(dbm, key);
rb_ary_push(ary, rb_assoc_new(rb_tainted_str_new(key.dptr, key.dsize),
rb_tainted_str_new(val.dptr, val.dsize)));
}
return ary;
}
static VALUE
fdbm_to_hash(obj)
VALUE obj;
{
datum key, val;
struct dbmdata *dbmp;
DBM *dbm;
VALUE hash;
GetDBM(obj, dbmp);
dbm = dbmp->di_dbm;
hash = rb_hash_new();
for (key = dbm_firstkey(dbm); key.dptr; key = dbm_nextkey(dbm)) {
val = dbm_fetch(dbm, key);
rb_hash_aset(hash, rb_tainted_str_new(key.dptr, key.dsize),
rb_tainted_str_new(val.dptr, val.dsize));
}
return hash;
}
static VALUE
fdbm_reject(obj)
VALUE obj;
{
return rb_hash_delete_if(fdbm_to_hash(obj));
}
void
Init_dbm()
{
rb_cDBM = rb_define_class("DBM", rb_cObject);
rb_eDBMError = rb_define_class("DBMError", rb_eStandardError);
rb_include_module(rb_cDBM, rb_mEnumerable);
rb_define_alloc_func(rb_cDBM, fdbm_alloc);
rb_define_singleton_method(rb_cDBM, "open", fdbm_s_open, -1);
rb_define_method(rb_cDBM, "initialize", fdbm_initialize, -1);
rb_define_method(rb_cDBM, "close", fdbm_close, 0);
rb_define_method(rb_cDBM, "[]", fdbm_aref, 1);
rb_define_method(rb_cDBM, "fetch", fdbm_fetch_m, -1);
rb_define_method(rb_cDBM, "[]=", fdbm_store, 2);
rb_define_method(rb_cDBM, "store", fdbm_store, 2);
rb_define_method(rb_cDBM, "index", fdbm_index, 1);
rb_define_method(rb_cDBM, "select", fdbm_select, 0);
rb_define_method(rb_cDBM, "values_at", fdbm_values_at, -1);
rb_define_method(rb_cDBM, "length", fdbm_length, 0);
rb_define_method(rb_cDBM, "size", fdbm_length, 0);
rb_define_method(rb_cDBM, "empty?", fdbm_empty_p, 0);
rb_define_method(rb_cDBM, "each", fdbm_each_pair, 0);
rb_define_method(rb_cDBM, "each_value", fdbm_each_value, 0);
rb_define_method(rb_cDBM, "each_key", fdbm_each_key, 0);
rb_define_method(rb_cDBM, "each_pair", fdbm_each_pair, 0);
rb_define_method(rb_cDBM, "keys", fdbm_keys, 0);
rb_define_method(rb_cDBM, "values", fdbm_values, 0);
rb_define_method(rb_cDBM, "shift", fdbm_shift, 0);
rb_define_method(rb_cDBM, "delete", fdbm_delete, 1);
rb_define_method(rb_cDBM, "delete_if", fdbm_delete_if, 0);
rb_define_method(rb_cDBM, "reject!", fdbm_delete_if, 0);
rb_define_method(rb_cDBM, "reject", fdbm_reject, 0);
rb_define_method(rb_cDBM, "clear", fdbm_clear, 0);
rb_define_method(rb_cDBM,"invert", fdbm_invert, 0);
rb_define_method(rb_cDBM,"update", fdbm_update, 1);
rb_define_method(rb_cDBM,"replace", fdbm_replace, 1);
rb_define_method(rb_cDBM, "include?", fdbm_has_key, 1);
rb_define_method(rb_cDBM, "has_key?", fdbm_has_key, 1);
rb_define_method(rb_cDBM, "member?", fdbm_has_key, 1);
rb_define_method(rb_cDBM, "has_value?", fdbm_has_value, 1);
rb_define_method(rb_cDBM, "key?", fdbm_has_key, 1);
rb_define_method(rb_cDBM, "value?", fdbm_has_value, 1);
rb_define_method(rb_cDBM, "to_a", fdbm_to_a, 0);
rb_define_method(rb_cDBM, "to_hash", fdbm_to_hash, 0);
/* flags for dbm_open() */
rb_define_const(rb_cDBM, "READER", INT2FIX(O_RDONLY|RUBY_DBM_RW_BIT));
rb_define_const(rb_cDBM, "WRITER", INT2FIX(O_RDWR|RUBY_DBM_RW_BIT));
rb_define_const(rb_cDBM, "WRCREAT", INT2FIX(O_RDWR|O_CREAT|RUBY_DBM_RW_BIT));
rb_define_const(rb_cDBM, "NEWDB", INT2FIX(O_RDWR|O_CREAT|O_TRUNC|RUBY_DBM_RW_BIT));
#ifdef DB_VERSION_STRING
rb_define_const(rb_cDBM, "VERSION", rb_str_new2(DB_VERSION_STRING));
#else
rb_define_const(rb_cDBM, "VERSION", rb_str_new2("unknown"));
#endif
}
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