/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB 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 of the License, 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ /* This file defines all string functions ** Warning: Some string functions doesn't always put and end-null on a String ** (This shouldn't be needed) */ #ifdef USE_PRAGMA_IMPLEMENTATION #pragma implementation // gcc: Class implementation #endif #include "mysql_priv.h" #include #ifdef HAVE_OPENSSL #include #endif /* HAVE_OPENSSL */ #include "md5.h" #include "sha1.h" #include "my_aes.h" C_MODE_START #include "../mysys/my_static.h" // For soundex_map C_MODE_END String my_empty_string("",default_charset_info); static void my_coll_agg_error(DTCollation &c1, DTCollation &c2, const char *fname) { my_error(ER_CANT_AGGREGATE_2COLLATIONS,MYF(0), c1.collation->name,c1.derivation_name(), c2.collation->name,c2.derivation_name(), fname); } uint nr_of_decimals(const char *str) { if ((str=strchr(str,'.'))) { const char *start= ++str; for (; my_isdigit(system_charset_info,*str) ; str++) ; return (uint) (str-start); } return 0; } double Item_str_func::val() { DBUG_ASSERT(fixed == 1); int err; char buff[64]; char *end_not_used; String *res, tmp(buff,sizeof(buff), &my_charset_bin); res= val_str(&tmp); return res ? my_strntod(res->charset(), (char*) res->ptr(),res->length(), &end_not_used, &err) : 0.0; } longlong Item_str_func::val_int() { DBUG_ASSERT(fixed == 1); int err; char buff[22]; String *res, tmp(buff,sizeof(buff), &my_charset_bin); res= val_str(&tmp); return (res ? my_strntoll(res->charset(), res->ptr(), res->length(), 10, NULL, &err) : (longlong) 0); } String *Item_func_md5::val_str(String *str) { DBUG_ASSERT(fixed == 1); String * sptr= args[0]->val_str(str); if (sptr) { my_MD5_CTX context; unsigned char digest[16]; null_value=0; my_MD5Init (&context); my_MD5Update (&context,(unsigned char *) sptr->ptr(), sptr->length()); my_MD5Final (digest, &context); if (str->alloc(32)) // Ensure that memory is free { null_value=1; return 0; } sprintf((char *) str->ptr(), "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x", digest[0], digest[1], digest[2], digest[3], digest[4], digest[5], digest[6], digest[7], digest[8], digest[9], digest[10], digest[11], digest[12], digest[13], digest[14], digest[15]); str->length((uint) 32); return str; } null_value=1; return 0; } void Item_func_md5::fix_length_and_dec() { max_length=32; /* The MD5() function treats its parameter as being a case sensitive. Thus we set binary collation on it so different instances of MD5() will be compared properly. */ args[0]->collation.set( get_charset_by_csname(args[0]->collation.collation->csname, MY_CS_BINSORT,MYF(0)), DERIVATION_COERCIBLE); } String *Item_func_sha::val_str(String *str) { DBUG_ASSERT(fixed == 1); String * sptr= args[0]->val_str(str); if (sptr) /* If we got value different from NULL */ { SHA1_CONTEXT context; /* Context used to generate SHA1 hash */ /* Temporary buffer to store 160bit digest */ uint8 digest[SHA1_HASH_SIZE]; mysql_sha1_reset(&context); /* We do not have to check for error here */ /* No need to check error as the only case would be too long message */ mysql_sha1_input(&context, (const unsigned char *) sptr->ptr(), sptr->length()); /* Ensure that memory is free and we got result */ if (!( str->alloc(SHA1_HASH_SIZE*2) || (mysql_sha1_result(&context,digest)))) { sprintf((char *) str->ptr(), "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x\ %02x%02x%02x%02x%02x%02x%02x%02x", digest[0], digest[1], digest[2], digest[3], digest[4], digest[5], digest[6], digest[7], digest[8], digest[9], digest[10], digest[11], digest[12], digest[13], digest[14], digest[15], digest[16], digest[17], digest[18], digest[19]); str->length((uint) SHA1_HASH_SIZE*2); null_value=0; return str; } } null_value=1; return 0; } void Item_func_sha::fix_length_and_dec() { max_length=SHA1_HASH_SIZE*2; // size of hex representation of hash /* The SHA() function treats its parameter as being a case sensitive. Thus we set binary collation on it so different instances of MD5() will be compared properly. */ args[0]->collation.set( get_charset_by_csname(args[0]->collation.collation->csname, MY_CS_BINSORT,MYF(0)), DERIVATION_COERCIBLE); } /* Implementation of AES encryption routines */ String *Item_func_aes_encrypt::val_str(String *str) { DBUG_ASSERT(fixed == 1); char key_buff[80]; String tmp_key_value(key_buff, sizeof(key_buff), system_charset_info); String *sptr= args[0]->val_str(str); // String to encrypt String *key= args[1]->val_str(&tmp_key_value); // key int aes_length; if (sptr && key) // we need both arguments to be not NULL { null_value=0; aes_length=my_aes_get_size(sptr->length()); // Calculate result length if (!str_value.alloc(aes_length)) // Ensure that memory is free { // finally encrypt directly to allocated buffer. if (my_aes_encrypt(sptr->ptr(),sptr->length(), (char*) str_value.ptr(), key->ptr(), key->length()) == aes_length) { // We got the expected result length str_value.length((uint) aes_length); return &str_value; } } } null_value=1; return 0; } void Item_func_aes_encrypt::fix_length_and_dec() { max_length=my_aes_get_size(args[0]->max_length); } String *Item_func_aes_decrypt::val_str(String *str) { DBUG_ASSERT(fixed == 1); char key_buff[80]; String tmp_key_value(key_buff, sizeof(key_buff), system_charset_info); String *sptr, *key; DBUG_ENTER("Item_func_aes_decrypt::val_str"); sptr= args[0]->val_str(str); // String to decrypt key= args[1]->val_str(&tmp_key_value); // Key if (sptr && key) // Need to have both arguments not NULL { null_value=0; if (!str_value.alloc(sptr->length())) // Ensure that memory is free { // finally decrypt directly to allocated buffer. int length; length=my_aes_decrypt(sptr->ptr(), sptr->length(), (char*) str_value.ptr(), key->ptr(), key->length()); if (length >= 0) // if we got correct data data { str_value.length((uint) length); DBUG_RETURN(&str_value); } } } // Bad parameters. No memory or bad data will all go here null_value=1; DBUG_RETURN(0); } void Item_func_aes_decrypt::fix_length_and_dec() { max_length=args[0]->max_length; maybe_null= 1; } /* Concatenate args with the following premises: If only one arg (which is ok), return value of arg Don't reallocate val_str() if not absolute necessary. */ String *Item_func_concat::val_str(String *str) { DBUG_ASSERT(fixed == 1); String *res,*res2,*use_as_buff; uint i; bool is_const= 0; null_value=0; if (!(res=args[0]->val_str(str))) goto null; use_as_buff= &tmp_value; /* Item_subselect in --ps-protocol mode will state it as a non-const */ is_const= args[0]->const_item() || !args[0]->used_tables(); for (i=1 ; i < arg_count ; i++) { if (res->length() == 0) { if (!(res=args[i]->val_str(str))) goto null; } else { if (!(res2=args[i]->val_str(use_as_buff))) goto null; if (res2->length() == 0) continue; if (res->length()+res2->length() > current_thd->variables.max_allowed_packet) { push_warning_printf(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN, ER_WARN_ALLOWED_PACKET_OVERFLOWED, ER(ER_WARN_ALLOWED_PACKET_OVERFLOWED), func_name(), current_thd->variables.max_allowed_packet); goto null; } if (!is_const && res->alloced_length() >= res->length()+res2->length()) { // Use old buffer res->append(*res2); } else if (str->alloced_length() >= res->length()+res2->length()) { if (str == res2) str->replace(0,0,*res); else { str->copy(*res); str->append(*res2); } res= str; use_as_buff= &tmp_value; } else if (res == &tmp_value) { if (res->append(*res2)) // Must be a blob goto null; } else if (res2 == &tmp_value) { // This can happend only 1 time if (tmp_value.replace(0,0,*res)) goto null; res= &tmp_value; use_as_buff=str; // Put next arg here } else if (tmp_value.is_alloced() && res2->ptr() >= tmp_value.ptr() && res2->ptr() <= tmp_value.ptr() + tmp_value.alloced_length()) { /* This happens really seldom: In this case res2 is sub string of tmp_value. We will now work in place in tmp_value to set it to res | res2 */ /* Chop the last characters in tmp_value that isn't in res2 */ tmp_value.length((uint32) (res2->ptr() - tmp_value.ptr()) + res2->length()); /* Place res2 at start of tmp_value, remove chars before res2 */ if (tmp_value.replace(0,(uint32) (res2->ptr() - tmp_value.ptr()), *res)) goto null; res= &tmp_value; use_as_buff=str; // Put next arg here } else { // Two big const strings if (tmp_value.alloc(max_length) || tmp_value.copy(*res) || tmp_value.append(*res2)) goto null; res= &tmp_value; use_as_buff=str; } is_const= 0; } } res->set_charset(collation.collation); return res; null: null_value=1; return 0; } void Item_func_concat::fix_length_and_dec() { ulonglong max_result_length= 0; if (agg_arg_charsets(collation, args, arg_count, MY_COLL_ALLOW_CONV)) return; for (uint i=0 ; i < arg_count ; i++) max_result_length+= args[i]->max_length; if (max_result_length >= MAX_BLOB_WIDTH) { max_result_length= MAX_BLOB_WIDTH; maybe_null= 1; } max_length= (ulong) max_result_length; } /* Function des_encrypt() by tonu@spam.ee & monty Works only if compiled with OpenSSL library support. This returns a binary string where first character is CHAR(128 | key-number). If one uses a string key key_number is 127. Encryption result is longer than original by formula: new_length= org_length + (8-(org_length % 8))+1 */ String *Item_func_des_encrypt::val_str(String *str) { DBUG_ASSERT(fixed == 1); #ifdef HAVE_OPENSSL uint code= ER_WRONG_PARAMETERS_TO_PROCEDURE; DES_cblock ivec; struct st_des_keyblock keyblock; struct st_des_keyschedule keyschedule; const char *append_str="********"; uint key_number, res_length, tail; String *res= args[0]->val_str(str); if ((null_value= args[0]->null_value)) return 0; // ENCRYPT(NULL) == NULL if ((res_length=res->length()) == 0) return &my_empty_string; if (arg_count == 1) { /* Protect against someone doing FLUSH DES_KEY_FILE */ VOID(pthread_mutex_lock(&LOCK_des_key_file)); keyschedule= des_keyschedule[key_number=des_default_key]; VOID(pthread_mutex_unlock(&LOCK_des_key_file)); } else if (args[1]->result_type() == INT_RESULT) { key_number= (uint) args[1]->val_int(); if (key_number > 9) goto error; VOID(pthread_mutex_lock(&LOCK_des_key_file)); keyschedule= des_keyschedule[key_number]; VOID(pthread_mutex_unlock(&LOCK_des_key_file)); } else { String *keystr=args[1]->val_str(&tmp_value); if (!keystr) goto error; key_number=127; // User key string /* We make good 24-byte (168 bit) key from given plaintext key with MD5 */ bzero((char*) &ivec,sizeof(ivec)); EVP_BytesToKey(EVP_des_ede3_cbc(),EVP_md5(),NULL, (uchar*) keystr->ptr(), (int) keystr->length(), 1, (uchar*) &keyblock,ivec); DES_set_key_unchecked(&keyblock.key1,&keyschedule.ks1); DES_set_key_unchecked(&keyblock.key2,&keyschedule.ks2); DES_set_key_unchecked(&keyblock.key3,&keyschedule.ks3); } /* The problem: DES algorithm requires original data to be in 8-bytes chunks. Missing bytes get filled with '*'s and result of encryption can be up to 8 bytes longer than original string. When decrypted, we do not know the size of original string :( We add one byte with value 0x1..0x8 as the last byte of the padded string marking change of string length. */ tail= (8-(res_length) % 8); // 1..8 marking extra length res_length+=tail; code= ER_OUT_OF_RESOURCES; if (tail && res->append(append_str, tail) || tmp_value.alloc(res_length+1)) goto error; (*res)[res_length-1]=tail; // save extra length tmp_value.length(res_length+1); tmp_value[0]=(char) (128 | key_number); // Real encryption bzero((char*) &ivec,sizeof(ivec)); DES_ede3_cbc_encrypt((const uchar*) (res->ptr()), (uchar*) (tmp_value.ptr()+1), res_length, &keyschedule.ks1, &keyschedule.ks2, &keyschedule.ks3, &ivec, TRUE); return &tmp_value; error: push_warning_printf(current_thd,MYSQL_ERROR::WARN_LEVEL_ERROR, code, ER(code), "des_encrypt"); #else push_warning_printf(current_thd,MYSQL_ERROR::WARN_LEVEL_ERROR, ER_FEATURE_DISABLED, ER(ER_FEATURE_DISABLED), "des_encrypt","--with-openssl"); #endif /* HAVE_OPENSSL */ null_value=1; return 0; } String *Item_func_des_decrypt::val_str(String *str) { DBUG_ASSERT(fixed == 1); #ifdef HAVE_OPENSSL uint code= ER_WRONG_PARAMETERS_TO_PROCEDURE; DES_key_schedule ks1, ks2, ks3; DES_cblock ivec; struct st_des_keyblock keyblock; struct st_des_keyschedule keyschedule; String *res= args[0]->val_str(str); uint length,tail; if ((null_value= args[0]->null_value)) return 0; length= res->length(); if (length < 9 || (length % 8) != 1 || !((*res)[0] & 128)) return res; // Skip decryption if not encrypted if (arg_count == 1) // If automatic uncompression { uint key_number=(uint) (*res)[0] & 127; // Check if automatic key and that we have privilege to uncompress using it if (!(current_thd->master_access & SUPER_ACL) || key_number > 9) goto error; VOID(pthread_mutex_lock(&LOCK_des_key_file)); keyschedule= des_keyschedule[key_number]; VOID(pthread_mutex_unlock(&LOCK_des_key_file)); } else { // We make good 24-byte (168 bit) key from given plaintext key with MD5 String *keystr=args[1]->val_str(&tmp_value); if (!keystr) goto error; bzero((char*) &ivec,sizeof(ivec)); EVP_BytesToKey(EVP_des_ede3_cbc(),EVP_md5(),NULL, (uchar*) keystr->ptr(),(int) keystr->length(), 1,(uchar*) &keyblock,ivec); // Here we set all 64-bit keys (56 effective) one by one DES_set_key_unchecked(&keyblock.key1,&keyschedule.ks1); DES_set_key_unchecked(&keyblock.key2,&keyschedule.ks2); DES_set_key_unchecked(&keyblock.key3,&keyschedule.ks3); } code= ER_OUT_OF_RESOURCES; if (tmp_value.alloc(length-1)) goto error; bzero((char*) &ivec,sizeof(ivec)); DES_ede3_cbc_encrypt((const uchar*) res->ptr()+1, (uchar*) (tmp_value.ptr()), length-1, &keyschedule.ks1, &keyschedule.ks2, &keyschedule.ks3, &ivec, FALSE); /* Restore old length of key */ if ((tail=(uint) (uchar) tmp_value[length-2]) > 8) goto wrong_key; // Wrong key tmp_value.length(length-1-tail); return &tmp_value; error: push_warning_printf(current_thd,MYSQL_ERROR::WARN_LEVEL_ERROR, code, ER(code), "des_decrypt"); wrong_key: #else push_warning_printf(current_thd,MYSQL_ERROR::WARN_LEVEL_ERROR, ER_FEATURE_DISABLED, ER(ER_FEATURE_DISABLED), "des_decrypt","--with-openssl"); #endif /* HAVE_OPENSSL */ null_value=1; return 0; } /* concat with separator. First arg is the separator concat_ws takes at least two arguments. */ String *Item_func_concat_ws::val_str(String *str) { DBUG_ASSERT(fixed == 1); char tmp_str_buff[10]; String tmp_sep_str(tmp_str_buff, sizeof(tmp_str_buff),default_charset_info), *sep_str, *res, *res2,*use_as_buff; uint i; null_value=0; if (!(sep_str= args[0]->val_str(&tmp_sep_str))) goto null; use_as_buff= &tmp_value; str->length(0); // QQ; Should be removed res=str; // Skip until non-null argument is found. // If not, return the empty string for (i=1; i < arg_count; i++) if ((res= args[i]->val_str(str))) break; if (i == arg_count) return &my_empty_string; for (i++; i < arg_count ; i++) { if (!(res2= args[i]->val_str(use_as_buff))) continue; // Skip NULL if (res->length() + sep_str->length() + res2->length() > current_thd->variables.max_allowed_packet) { push_warning_printf(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN, ER_WARN_ALLOWED_PACKET_OVERFLOWED, ER(ER_WARN_ALLOWED_PACKET_OVERFLOWED), func_name(), current_thd->variables.max_allowed_packet); goto null; } if (res->alloced_length() >= res->length() + sep_str->length() + res2->length()) { // Use old buffer res->append(*sep_str); // res->length() > 0 always res->append(*res2); } else if (str->alloced_length() >= res->length() + sep_str->length() + res2->length()) { /* We have room in str; We can't get any errors here */ if (str == res2) { // This is quote uncommon! str->replace(0,0,*sep_str); str->replace(0,0,*res); } else { str->copy(*res); str->append(*sep_str); str->append(*res2); } res=str; use_as_buff= &tmp_value; } else if (res == &tmp_value) { if (res->append(*sep_str) || res->append(*res2)) goto null; // Must be a blob } else if (res2 == &tmp_value) { // This can happend only 1 time if (tmp_value.replace(0,0,*sep_str) || tmp_value.replace(0,0,*res)) goto null; res= &tmp_value; use_as_buff=str; // Put next arg here } else if (tmp_value.is_alloced() && res2->ptr() >= tmp_value.ptr() && res2->ptr() < tmp_value.ptr() + tmp_value.alloced_length()) { /* This happens really seldom: In this case res2 is sub string of tmp_value. We will now work in place in tmp_value to set it to res | sep_str | res2 */ /* Chop the last characters in tmp_value that isn't in res2 */ tmp_value.length((uint32) (res2->ptr() - tmp_value.ptr()) + res2->length()); /* Place res2 at start of tmp_value, remove chars before res2 */ if (tmp_value.replace(0,(uint32) (res2->ptr() - tmp_value.ptr()), *res) || tmp_value.replace(res->length(),0, *sep_str)) goto null; res= &tmp_value; use_as_buff=str; // Put next arg here } else { // Two big const strings if (tmp_value.alloc(max_length) || tmp_value.copy(*res) || tmp_value.append(*sep_str) || tmp_value.append(*res2)) goto null; res= &tmp_value; use_as_buff=str; } } res->set_charset(collation.collation); return res; null: null_value=1; return 0; } void Item_func_concat_ws::fix_length_and_dec() { ulonglong max_result_length; if (agg_arg_charsets(collation, args, arg_count, MY_COLL_ALLOW_CONV)) return; /* arg_count cannot be less than 2, it is done on parser level in sql_yacc.yy so, (arg_count - 2) is safe here. */ max_result_length= (ulonglong) args[0]->max_length * (arg_count - 2); for (uint i=1 ; i < arg_count ; i++) max_result_length+=args[i]->max_length; if (max_result_length >= MAX_BLOB_WIDTH) { max_result_length= MAX_BLOB_WIDTH; maybe_null= 1; } max_length= (ulong) max_result_length; } String *Item_func_reverse::val_str(String *str) { DBUG_ASSERT(fixed == 1); String *res = args[0]->val_str(str); char *ptr,*end; if ((null_value=args[0]->null_value)) return 0; /* An empty string is a special case as the string pointer may be null */ if (!res->length()) return &my_empty_string; res=copy_if_not_alloced(str,res,res->length()); ptr = (char *) res->ptr(); end=ptr+res->length(); #ifdef USE_MB if (use_mb(res->charset())) { String tmpstr; tmpstr.copy(*res); char *tmp = (char *) tmpstr.ptr() + tmpstr.length(); register uint32 l; while (ptr < end) { if ((l=my_ismbchar(res->charset(), ptr,end))) tmp-=l, memcpy(tmp,ptr,l), ptr+=l; else *--tmp=*ptr++; } memcpy((char *) res->ptr(),(char *) tmpstr.ptr(), res->length()); } else #endif /* USE_MB */ { char tmp; while (ptr < end) { tmp=*ptr; *ptr++=*--end; *end=tmp; } } return res; } void Item_func_reverse::fix_length_and_dec() { collation.set(args[0]->collation); max_length = args[0]->max_length; } /* ** Replace all occurences of string2 in string1 with string3. ** Don't reallocate val_str() if not needed */ /* TODO: Fix that this works with binary strings when using USE_MB */ String *Item_func_replace::val_str(String *str) { DBUG_ASSERT(fixed == 1); String *res,*res2,*res3; int offset; uint from_length,to_length; bool alloced=0; #ifdef USE_MB const char *ptr,*end,*strend,*search,*search_end; register uint32 l; bool binary_cmp; #endif null_value=0; res=args[0]->val_str(str); if (args[0]->null_value) goto null; res2=args[1]->val_str(&tmp_value); if (args[1]->null_value) goto null; res->set_charset(collation.collation); #ifdef USE_MB binary_cmp = ((res->charset()->state & MY_CS_BINSORT) || !use_mb(res->charset())); #endif if (res2->length() == 0) return res; #ifndef USE_MB if ((offset=res->strstr(*res2)) < 0) return res; #else offset=0; if (binary_cmp && (offset=res->strstr(*res2)) < 0) return res; #endif if (!(res3=args[2]->val_str(&tmp_value2))) goto null; from_length= res2->length(); to_length= res3->length(); #ifdef USE_MB if (!binary_cmp) { search=res2->ptr(); search_end=search+from_length; redo: ptr=res->ptr()+offset; strend=res->ptr()+res->length(); end=strend-from_length+1; while (ptr < end) { if (*ptr == *search) { register char *i,*j; i=(char*) ptr+1; j=(char*) search+1; while (j != search_end) if (*i++ != *j++) goto skip; offset= (int) (ptr-res->ptr()); if (res->length()-from_length + to_length > current_thd->variables.max_allowed_packet) { push_warning_printf(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN, ER_WARN_ALLOWED_PACKET_OVERFLOWED, ER(ER_WARN_ALLOWED_PACKET_OVERFLOWED), func_name(), current_thd->variables.max_allowed_packet); goto null; } if (!alloced) { alloced=1; res=copy_if_not_alloced(str,res,res->length()+to_length); } res->replace((uint) offset,from_length,*res3); offset+=(int) to_length; goto redo; } skip: if ((l=my_ismbchar(res->charset(), ptr,strend))) ptr+=l; else ++ptr; } } else #endif /* USE_MB */ do { if (res->length()-from_length + to_length > current_thd->variables.max_allowed_packet) { push_warning_printf(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN, ER_WARN_ALLOWED_PACKET_OVERFLOWED, ER(ER_WARN_ALLOWED_PACKET_OVERFLOWED), func_name(), current_thd->variables.max_allowed_packet); goto null; } if (!alloced) { alloced=1; res=copy_if_not_alloced(str,res,res->length()+to_length); } res->replace((uint) offset,from_length,*res3); offset+=(int) to_length; } while ((offset=res->strstr(*res2,(uint) offset)) >= 0); return res; null: null_value=1; return 0; } void Item_func_replace::fix_length_and_dec() { ulonglong max_result_length= args[0]->max_length; int diff=(int) (args[2]->max_length - args[1]->max_length); if (diff > 0 && args[1]->max_length) { // Calculate of maxreplaces ulonglong max_substrs= max_result_length/args[1]->max_length; max_result_length+= max_substrs * (uint) diff; } if (max_result_length >= MAX_BLOB_WIDTH) { max_result_length= MAX_BLOB_WIDTH; maybe_null= 1; } max_length= (ulong) max_result_length; if (agg_arg_charsets(collation, args, 3, MY_COLL_CMP_CONV)) return; } String *Item_func_insert::val_str(String *str) { DBUG_ASSERT(fixed == 1); String *res,*res2; uint start,length; null_value=0; res=args[0]->val_str(str); res2=args[3]->val_str(&tmp_value); start=(uint) args[1]->val_int()-1; length=(uint) args[2]->val_int(); if (args[0]->null_value || args[1]->null_value || args[2]->null_value || args[3]->null_value) goto null; /* purecov: inspected */ start=res->charpos(start); length=res->charpos(length,start); if (start > res->length()+1) return res; // Wrong param; skip insert if (length > res->length()-start) length=res->length()-start; if (res->length() - length + res2->length() > current_thd->variables.max_allowed_packet) { push_warning_printf(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN, ER_WARN_ALLOWED_PACKET_OVERFLOWED, ER(ER_WARN_ALLOWED_PACKET_OVERFLOWED), func_name(), current_thd->variables.max_allowed_packet); goto null; } res=copy_if_not_alloced(str,res,res->length()); res->replace(start,length,*res2); return res; null: null_value=1; return 0; } void Item_func_insert::fix_length_and_dec() { Item *cargs[2]; ulonglong max_result_length; cargs[0]= args[0]; cargs[1]= args[3]; if (agg_arg_charsets(collation, cargs, 2, MY_COLL_ALLOW_CONV)) return; args[0]= cargs[0]; args[3]= cargs[1]; max_result_length= ((ulonglong) args[0]->max_length+ (ulonglong) args[3]->max_length); if (max_result_length >= MAX_BLOB_WIDTH) { max_result_length= MAX_BLOB_WIDTH; maybe_null= 1; } max_length= (ulong) max_result_length; } String *Item_func_lcase::val_str(String *str) { DBUG_ASSERT(fixed == 1); String *res; if (!(res=args[0]->val_str(str))) { null_value=1; /* purecov: inspected */ return 0; /* purecov: inspected */ } null_value=0; res=copy_if_not_alloced(str,res,res->length()); res->casedn(); return res; } String *Item_func_ucase::val_str(String *str) { DBUG_ASSERT(fixed == 1); String *res; if (!(res=args[0]->val_str(str))) { null_value=1; /* purecov: inspected */ return 0; /* purecov: inspected */ } null_value=0; res=copy_if_not_alloced(str,res,res->length()); res->caseup(); return res; } String *Item_func_left::val_str(String *str) { DBUG_ASSERT(fixed == 1); String *res =args[0]->val_str(str); long length =(long) args[1]->val_int(); uint char_pos; if ((null_value=args[0]->null_value)) return 0; if (length <= 0) return &my_empty_string; if (res->length() <= (uint) length || res->length() <= (char_pos= res->charpos(length))) return res; tmp_value.set(*res, 0, char_pos); return &tmp_value; } void Item_str_func::left_right_max_length() { max_length=args[0]->max_length; if (args[1]->const_item()) { int length=(int) args[1]->val_int()*collation.collation->mbmaxlen; if (length <= 0) max_length=0; else set_if_smaller(max_length,(uint) length); } } void Item_func_left::fix_length_and_dec() { collation.set(args[0]->collation); left_right_max_length(); } String *Item_func_right::val_str(String *str) { DBUG_ASSERT(fixed == 1); String *res =args[0]->val_str(str); long length =(long) args[1]->val_int(); if ((null_value=args[0]->null_value)) return 0; /* purecov: inspected */ if (length <= 0) return &my_empty_string; /* purecov: inspected */ if (res->length() <= (uint) length) return res; /* purecov: inspected */ uint start=res->numchars(); if (start <= (uint) length) return res; start=res->charpos(start - (uint) length); tmp_value.set(*res,start,res->length()-start); return &tmp_value; } void Item_func_right::fix_length_and_dec() { collation.set(args[0]->collation); left_right_max_length(); } String *Item_func_substr::val_str(String *str) { DBUG_ASSERT(fixed == 1); String *res = args[0]->val_str(str); int32 start = (int32) args[1]->val_int(); int32 length = arg_count == 3 ? (int32) args[2]->val_int() : INT_MAX32; int32 tmp_length; if ((null_value=(args[0]->null_value || args[1]->null_value || (arg_count == 3 && args[2]->null_value)))) return 0; /* purecov: inspected */ start= (int32)((start < 0) ? res->numchars() + start : start -1); start=res->charpos(start); length=res->charpos(length,start); if (start < 0 || (uint) start+1 > res->length() || length <= 0) return &my_empty_string; tmp_length=(int32) res->length()-start; length=min(length,tmp_length); if (!start && res->length() == (uint) length) return res; tmp_value.set(*res,(uint) start,(uint) length); return &tmp_value; } void Item_func_substr::fix_length_and_dec() { max_length=args[0]->max_length; collation.set(args[0]->collation); if (args[1]->const_item()) { int32 start= (int32) args[1]->val_int(); start= (int32)((start < 0) ? max_length + start : start - 1); if (start < 0 || start >= (int32) max_length) max_length=0; /* purecov: inspected */ else max_length-= (uint) start; } if (arg_count == 3 && args[2]->const_item()) { int32 length= (int32) args[2]->val_int() * collation.collation->mbmaxlen; if (length <= 0) max_length=0; /* purecov: inspected */ else set_if_smaller(max_length,(uint) length); } } void Item_func_substr_index::fix_length_and_dec() { max_length= args[0]->max_length; if (agg_arg_charsets(collation, args, 2, MY_COLL_CMP_CONV)) return; } String *Item_func_substr_index::val_str(String *str) { DBUG_ASSERT(fixed == 1); String *res =args[0]->val_str(str); String *delimeter =args[1]->val_str(&tmp_value); int32 count = (int32) args[2]->val_int(); uint offset; if (args[0]->null_value || args[1]->null_value || args[2]->null_value) { // string and/or delim are null null_value=1; return 0; } null_value=0; uint delimeter_length=delimeter->length(); if (!res->length() || !delimeter_length || !count) return &my_empty_string; // Wrong parameters res->set_charset(collation.collation); #ifdef USE_MB if (use_mb(res->charset())) { const char *ptr=res->ptr(); const char *strend = ptr+res->length(); const char *end=strend-delimeter_length+1; const char *search=delimeter->ptr(); const char *search_end=search+delimeter_length; int32 n=0,c=count,pass; register uint32 l; for (pass=(count>0);pass<2;++pass) { while (ptr < end) { if (*ptr == *search) { register char *i,*j; i=(char*) ptr+1; j=(char*) search+1; while (j != search_end) if (*i++ != *j++) goto skip; if (pass==0) ++n; else if (!--c) break; ptr+=delimeter_length; continue; } skip: if ((l=my_ismbchar(res->charset(), ptr,strend))) ptr+=l; else ++ptr; } /* either not found or got total number when count<0 */ if (pass == 0) /* count<0 */ { c+=n+1; if (c<=0) return res; /* not found, return original string */ ptr=res->ptr(); } else { if (c) return res; /* Not found, return original string */ if (count>0) /* return left part */ { tmp_value.set(*res,0,(ulong) (ptr-res->ptr())); } else /* return right part */ { ptr+=delimeter_length; tmp_value.set(*res,(ulong) (ptr-res->ptr()), (ulong) (strend-ptr)); } } } } else #endif /* USE_MB */ { if (count > 0) { // start counting from the beginning for (offset=0 ;; offset+=delimeter_length) { if ((int) (offset=res->strstr(*delimeter,offset)) < 0) return res; // Didn't find, return org string if (!--count) { tmp_value.set(*res,0,offset); break; } } } else { /* Negative index, start counting at the end */ for (offset=res->length(); offset ;) { /* this call will result in finding the position pointing to one address space less than where the found substring is located in res */ if ((int) (offset=res->strrstr(*delimeter,offset)) < 0) return res; // Didn't find, return org string /* At this point, we've searched for the substring the number of times as supplied by the index value */ if (!++count) { offset+=delimeter_length; tmp_value.set(*res,offset,res->length()- offset); break; } } } } return (&tmp_value); } /* ** The trim functions are extension to ANSI SQL because they trim substrings ** They ltrim() and rtrim() functions are optimized for 1 byte strings ** They also return the original string if possible, else they return ** a substring that points at the original string. */ String *Item_func_ltrim::val_str(String *str) { DBUG_ASSERT(fixed == 1); String *res =args[0]->val_str(str); if ((null_value=args[0]->null_value)) return 0; /* purecov: inspected */ char buff[MAX_FIELD_WIDTH]; String tmp(buff,sizeof(buff),res->charset()); String *remove_str= (arg_count==2) ? args[1]->val_str(&tmp) : &remove; uint remove_length; LINT_INIT(remove_length); if (!remove_str || (remove_length=remove_str->length()) == 0 || remove_length > res->length()) return res; char *ptr=(char*) res->ptr(); char *end=ptr+res->length(); if (remove_length == 1) { char chr=(*remove_str)[0]; while (ptr != end && *ptr == chr) ptr++; } else { const char *r_ptr=remove_str->ptr(); end-=remove_length; while (ptr <= end && !memcmp(ptr, r_ptr, remove_length)) ptr+=remove_length; end+=remove_length; } if (ptr == res->ptr()) return res; tmp_value.set(*res,(uint) (ptr - res->ptr()),(uint) (end-ptr)); return &tmp_value; } String *Item_func_rtrim::val_str(String *str) { DBUG_ASSERT(fixed == 1); String *res =args[0]->val_str(str); if ((null_value=args[0]->null_value)) return 0; /* purecov: inspected */ char buff[MAX_FIELD_WIDTH]; String tmp(buff,sizeof(buff),res->charset()); String *remove_str= (arg_count==2) ? args[1]->val_str(&tmp) : &remove; uint remove_length; LINT_INIT(remove_length); if (!remove_str || (remove_length=remove_str->length()) == 0 || remove_length > res->length()) return res; char *ptr=(char*) res->ptr(); char *end=ptr+res->length(); #ifdef USE_MB char *p=ptr; register uint32 l; #endif if (remove_length == 1) { char chr=(*remove_str)[0]; #ifdef USE_MB if (use_mb(res->charset())) { while (ptr < end) { if ((l=my_ismbchar(res->charset(), ptr,end))) ptr+=l,p=ptr; else ++ptr; } ptr=p; } #endif while (ptr != end && end[-1] == chr) end--; } else { const char *r_ptr=remove_str->ptr(); #ifdef USE_MB if (use_mb(res->charset())) { loop: while (ptr + remove_length < end) { if ((l=my_ismbchar(res->charset(), ptr,end))) ptr+=l; else ++ptr; } if (ptr + remove_length == end && !memcmp(ptr,r_ptr,remove_length)) { end-=remove_length; ptr=p; goto loop; } } else #endif /* USE_MB */ { while (ptr + remove_length <= end && !memcmp(end-remove_length, r_ptr, remove_length)) end-=remove_length; } } if (end == res->ptr()+res->length()) return res; tmp_value.set(*res,0,(uint) (end-res->ptr())); return &tmp_value; } String *Item_func_trim::val_str(String *str) { DBUG_ASSERT(fixed == 1); String *res =args[0]->val_str(str); if ((null_value=args[0]->null_value)) return 0; /* purecov: inspected */ char buff[MAX_FIELD_WIDTH]; String tmp(buff,sizeof(buff),res->charset()); uint remove_length; LINT_INIT(remove_length); String *remove_str; /* The string to remove from res. */ if (arg_count == 2) { remove_str= args[1]->val_str(&tmp); if ((null_value= args[1]->null_value)) return 0; } else remove_str= &remove; /* Default value. */ if (!remove_str || (remove_length=remove_str->length()) == 0 || remove_length > res->length()) return res; char *ptr=(char*) res->ptr(); char *end=ptr+res->length(); const char *r_ptr=remove_str->ptr(); while (ptr+remove_length <= end && !memcmp(ptr,r_ptr,remove_length)) ptr+=remove_length; #ifdef USE_MB if (use_mb(res->charset())) { char *p=ptr; register uint32 l; loop: while (ptr + remove_length < end) { if ((l=my_ismbchar(res->charset(), ptr,end))) ptr+=l; else ++ptr; } if (ptr + remove_length == end && !memcmp(ptr,r_ptr,remove_length)) { end-=remove_length; ptr=p; goto loop; } ptr=p; } else #endif /* USE_MB */ { while (ptr + remove_length <= end && !memcmp(end-remove_length,r_ptr,remove_length)) end-=remove_length; } if (ptr == res->ptr() && end == ptr+res->length()) return res; tmp_value.set(*res,(uint) (ptr - res->ptr()),(uint) (end-ptr)); return &tmp_value; } void Item_func_trim::fix_length_and_dec() { max_length= args[0]->max_length; if (arg_count == 1) { collation.set(args[0]->collation); remove.set_charset(collation.collation); remove.set_ascii(" ",1); } else { Item *cargs[2]; cargs[0]= args[1]; cargs[1]= args[0]; if (agg_arg_charsets(collation, cargs, 2, MY_COLL_CMP_CONV)) return; args[0]= cargs[1]; args[1]= cargs[0]; } } /* Item_func_password */ String *Item_func_password::val_str(String *str) { DBUG_ASSERT(fixed == 1); String *res= args[0]->val_str(str); if ((null_value=args[0]->null_value)) return 0; if (res->length() == 0) return &my_empty_string; make_scrambled_password(tmp_value, res->c_ptr()); str->set(tmp_value, SCRAMBLED_PASSWORD_CHAR_LENGTH, res->charset()); return str; } char *Item_func_password::alloc(THD *thd, const char *password) { char *buff= (char *) thd->alloc(SCRAMBLED_PASSWORD_CHAR_LENGTH+1); if (buff) make_scrambled_password(buff, password); return buff; } /* Item_func_old_password */ String *Item_func_old_password::val_str(String *str) { DBUG_ASSERT(fixed == 1); String *res= args[0]->val_str(str); if ((null_value=args[0]->null_value)) return 0; if (res->length() == 0) return &my_empty_string; make_scrambled_password_323(tmp_value, res->c_ptr()); str->set(tmp_value, SCRAMBLED_PASSWORD_CHAR_LENGTH_323, res->charset()); return str; } char *Item_func_old_password::alloc(THD *thd, const char *password) { char *buff= (char *) thd->alloc(SCRAMBLED_PASSWORD_CHAR_LENGTH_323+1); if (buff) make_scrambled_password_323(buff, password); return buff; } #define bin_to_ascii(c) ((c)>=38?((c)-38+'a'):(c)>=12?((c)-12+'A'):(c)+'.') String *Item_func_encrypt::val_str(String *str) { DBUG_ASSERT(fixed == 1); String *res =args[0]->val_str(str); #ifdef HAVE_CRYPT char salt[3],*salt_ptr; if ((null_value=args[0]->null_value)) return 0; if (res->length() == 0) return &my_empty_string; if (arg_count == 1) { // generate random salt time_t timestamp=current_thd->query_start(); salt[0] = bin_to_ascii( (ulong) timestamp & 0x3f); salt[1] = bin_to_ascii(( (ulong) timestamp >> 5) & 0x3f); salt[2] = 0; salt_ptr=salt; } else { // obtain salt from the first two bytes String *salt_str=args[1]->val_str(&tmp_value); if ((null_value= (args[1]->null_value || salt_str->length() < 2))) return 0; salt_ptr= salt_str->c_ptr(); } pthread_mutex_lock(&LOCK_crypt); char *tmp= crypt(res->c_ptr(),salt_ptr); if (!tmp) { pthread_mutex_unlock(&LOCK_crypt); null_value= 1; return 0; } str->set(tmp,(uint) strlen(tmp),res->charset()); str->copy(); pthread_mutex_unlock(&LOCK_crypt); return str; #else null_value=1; return 0; #endif /* HAVE_CRYPT */ } void Item_func_encode::fix_length_and_dec() { max_length=args[0]->max_length; maybe_null=args[0]->maybe_null; collation.set(&my_charset_bin); } String *Item_func_encode::val_str(String *str) { DBUG_ASSERT(fixed == 1); String *res; if (!(res=args[0]->val_str(str))) { null_value=1; /* purecov: inspected */ return 0; /* purecov: inspected */ } null_value=0; res=copy_if_not_alloced(str,res,res->length()); sql_crypt.init(); sql_crypt.encode((char*) res->ptr(),res->length()); res->set_charset(&my_charset_bin); return res; } String *Item_func_decode::val_str(String *str) { DBUG_ASSERT(fixed == 1); String *res; if (!(res=args[0]->val_str(str))) { null_value=1; /* purecov: inspected */ return 0; /* purecov: inspected */ } null_value=0; res=copy_if_not_alloced(str,res,res->length()); sql_crypt.init(); sql_crypt.decode((char*) res->ptr(),res->length()); return res; } Item *Item_func_sysconst::safe_charset_converter(CHARSET_INFO *tocs) { Item_string *conv; uint conv_errors; String tmp, cstr, *ostr= val_str(&tmp); cstr.copy(ostr->ptr(), ostr->length(), ostr->charset(), tocs, &conv_errors); if (conv_errors || !(conv= new Item_string(cstr.ptr(), cstr.length(), cstr.charset(), collation.derivation))) { return NULL; } conv->str_value.copy(); conv->str_value.shrink_to_length(); return conv; } String *Item_func_database::val_str(String *str) { DBUG_ASSERT(fixed == 1); THD *thd= current_thd; if (!thd->db) { null_value= 1; return 0; } else str->copy((const char*) thd->db,(uint) strlen(thd->db),system_charset_info); return str; } // TODO: make USER() replicate properly (currently it is replicated to "") String *Item_func_user::val_str(String *str) { DBUG_ASSERT(fixed == 1); THD *thd=current_thd; CHARSET_INFO *cs= system_charset_info; const char *host= thd->host_or_ip; uint res_length; // For system threads (e.g. replication SQL thread) user may be empty if (!thd->user) return &my_empty_string; res_length= (strlen(thd->user)+strlen(host)+2) * cs->mbmaxlen; if (str->alloc(res_length)) { null_value=1; return 0; } res_length=cs->cset->snprintf(cs, (char*)str->ptr(), res_length, "%s@%s", thd->user, host); str->length(res_length); str->set_charset(cs); return str; } void Item_func_soundex::fix_length_and_dec() { collation.set(args[0]->collation); max_length=args[0]->max_length; set_if_bigger(max_length,4); } /* If alpha, map input letter to soundex code. If not alpha and remove_garbage is set then skip to next char else return 0 */ static char soundex_toupper(char ch) { return (ch >= 'a' && ch <= 'z') ? ch - 'a' + 'A' : ch; } static char get_scode(char *ptr) { uchar ch= soundex_toupper(*ptr); if (ch < 'A' || ch > 'Z') { // Thread extended alfa (country spec) return '0'; // as vokal } return(soundex_map[ch-'A']); } String *Item_func_soundex::val_str(String *str) { DBUG_ASSERT(fixed == 1); String *res =args[0]->val_str(str); char last_ch,ch; CHARSET_INFO *cs= collation.collation; if ((null_value=args[0]->null_value)) return 0; /* purecov: inspected */ if (tmp_value.alloc(max(res->length(),4))) return str; /* purecov: inspected */ char *to= (char *) tmp_value.ptr(); char *from= (char *) res->ptr(), *end=from+res->length(); tmp_value.set_charset(cs); while (from != end && !my_isalpha(cs,*from)) // Skip pre-space from++; /* purecov: inspected */ if (from == end) return &my_empty_string; // No alpha characters. *to++ = soundex_toupper(*from); // Copy first letter last_ch = get_scode(from); // code of the first letter // for the first 'double-letter check. // Loop on input letters until // end of input (null) or output // letter code count = 3 for (from++ ; from < end ; from++) { if (!my_isalpha(cs,*from)) continue; ch=get_scode(from); if ((ch != '0') && (ch != last_ch)) // if not skipped or double { *to++ = ch; // letter, copy to output last_ch = ch; // save code of last input letter } // for next double-letter check } for (end=(char*) tmp_value.ptr()+4 ; to < end ; to++) *to = '0'; *to=0; // end string tmp_value.length((uint) (to-tmp_value.ptr())); return &tmp_value; } /* ** Change a number to format '3,333,333,333.000' ** This should be 'internationalized' sometimes. */ Item_func_format::Item_func_format(Item *org,int dec) :Item_str_func(org) { decimals=(uint) set_zone(dec,0,30); } /* TODO: This needs to be fixed for multi-byte character set where numbers are stored in more than one byte */ String *Item_func_format::val_str(String *str) { DBUG_ASSERT(fixed == 1); double nr =args[0]->val(); int diff; uint32 length, str_length; uint dec; if ((null_value=args[0]->null_value)) return 0; /* purecov: inspected */ dec= decimals ? decimals+1 : 0; /* Here default_charset() is right as this is not an automatic conversion */ str->set(nr,decimals, default_charset()); if (isnan(nr)) return str; str_length=str->length(); if (nr < 0) str_length--; // Don't count sign /* We need this test to handle 'nan' values */ if (str_length >= dec+4) { char *tmp,*pos; length= str->length()+(diff= (int)(str_length- dec-1)/3); str= copy_if_not_alloced(&tmp_str,str,length); str->length(length); tmp= (char*) str->ptr()+length - dec-1; for (pos= (char*) str->ptr()+length-1; pos != tmp; pos--) pos[0]= pos[-diff]; while (diff) { *pos= *(pos - diff); pos--; *pos= *(pos - diff); pos--; *pos= *(pos - diff); pos--; pos[0]=','; pos--; diff--; } } return str; } void Item_func_format::print(String *str) { str->append("format(", 7); args[0]->print(str); str->append(','); // my_charset_bin is good enough for numbers char buffer[20]; String st(buffer, sizeof(buffer), &my_charset_bin); st.set((ulonglong)decimals, &my_charset_bin); str->append(st); str->append(')'); } void Item_func_elt::fix_length_and_dec() { max_length=0; decimals=0; if (agg_arg_charsets(collation, args+1, arg_count-1, MY_COLL_ALLOW_CONV)) return; for (uint i= 1 ; i < arg_count ; i++) { set_if_bigger(max_length,args[i]->max_length); set_if_bigger(decimals,args[i]->decimals); } maybe_null=1; // NULL if wrong first arg } double Item_func_elt::val() { DBUG_ASSERT(fixed == 1); uint tmp; null_value=1; if ((tmp=(uint) args[0]->val_int()) == 0 || tmp >= arg_count) return 0.0; double result= args[tmp]->val(); null_value= args[tmp]->null_value; return result; } longlong Item_func_elt::val_int() { DBUG_ASSERT(fixed == 1); uint tmp; null_value=1; if ((tmp=(uint) args[0]->val_int()) == 0 || tmp >= arg_count) return 0; longlong result= args[tmp]->val_int(); null_value= args[tmp]->null_value; return result; } String *Item_func_elt::val_str(String *str) { DBUG_ASSERT(fixed == 1); uint tmp; null_value=1; if ((tmp=(uint) args[0]->val_int()) == 0 || tmp >= arg_count) return NULL; String *result= args[tmp]->val_str(str); if (result) result->set_charset(collation.collation); null_value= args[tmp]->null_value; return result; } void Item_func_make_set::split_sum_func(THD *thd, Item **ref_pointer_array, List &fields) { item->split_sum_func2(thd, ref_pointer_array, fields, &item); Item_str_func::split_sum_func(thd, ref_pointer_array, fields); } void Item_func_make_set::fix_length_and_dec() { max_length=arg_count-1; if (agg_arg_charsets(collation, args, arg_count, MY_COLL_ALLOW_CONV)) return; for (uint i=0 ; i < arg_count ; i++) max_length+=args[i]->max_length; used_tables_cache|= item->used_tables(); not_null_tables_cache&= item->not_null_tables(); const_item_cache&= item->const_item(); with_sum_func= with_sum_func || item->with_sum_func; } void Item_func_make_set::update_used_tables() { Item_func::update_used_tables(); item->update_used_tables(); used_tables_cache|=item->used_tables(); const_item_cache&=item->const_item(); } String *Item_func_make_set::val_str(String *str) { DBUG_ASSERT(fixed == 1); ulonglong bits; bool first_found=0; Item **ptr=args; String *result=&my_empty_string; bits=item->val_int(); if ((null_value=item->null_value)) return NULL; if (arg_count < 64) bits &= ((ulonglong) 1 << arg_count)-1; for (; bits; bits >>= 1, ptr++) { if (bits & 1) { String *res= (*ptr)->val_str(str); if (res) // Skip nulls { if (!first_found) { // First argument first_found=1; if (res != str) result=res; // Use original string else { if (tmp_str.copy(*res)) // Don't use 'str' return &my_empty_string; result= &tmp_str; } } else { if (result != &tmp_str) { // Copy data to tmp_str if (tmp_str.alloc(result->length()+res->length()+1) || tmp_str.copy(*result)) return &my_empty_string; result= &tmp_str; } if (tmp_str.append(',') || tmp_str.append(*res)) return &my_empty_string; } } } } return result; } void Item_func_make_set::print(String *str) { str->append("make_set(", 9); item->print(str); if (arg_count) { str->append(','); print_args(str, 0); } str->append(')'); } String *Item_func_char::val_str(String *str) { DBUG_ASSERT(fixed == 1); str->length(0); for (uint i=0 ; i < arg_count ; i++) { int32 num=(int32) args[i]->val_int(); if (!args[i]->null_value) { #ifdef USE_MB if (use_mb(collation.collation)) { if (num&0xFF000000L) { str->append((char)(num>>24)); goto b2; } else if (num&0xFF0000L) { b2: str->append((char)(num>>16)); goto b1; } else if (num&0xFF00L) { b1: str->append((char)(num>>8)); } } #endif str->append((char)num); } } str->set_charset(collation.collation); str->realloc(str->length()); // Add end 0 (for Purify) return str; } inline String* alloc_buffer(String *res,String *str,String *tmp_value, ulong length) { if (res->alloced_length() < length) { if (str->alloced_length() >= length) { (void) str->copy(*res); str->length(length); return str; } if (tmp_value->alloc(length)) return 0; (void) tmp_value->copy(*res); tmp_value->length(length); return tmp_value; } res->length(length); return res; } void Item_func_repeat::fix_length_and_dec() { collation.set(args[0]->collation); if (args[1]->const_item()) { ulonglong max_result_length= ((ulonglong) args[0]->max_length * args[1]->val_int()); if (max_result_length >= MAX_BLOB_WIDTH) { max_result_length= MAX_BLOB_WIDTH; maybe_null= 1; } max_length= (ulong) max_result_length; } else { max_length= MAX_BLOB_WIDTH; maybe_null= 1; } } /* ** Item_func_repeat::str is carefully written to avoid reallocs ** as much as possible at the cost of a local buffer */ String *Item_func_repeat::val_str(String *str) { DBUG_ASSERT(fixed == 1); uint length,tot_length; char *to; long count= (long) args[1]->val_int(); String *res =args[0]->val_str(str); if (args[0]->null_value || args[1]->null_value) goto err; // string and/or delim are null null_value=0; if (count <= 0) // For nicer SQL code return &my_empty_string; if (count == 1) // To avoid reallocs return res; length=res->length(); // Safe length check if (length > current_thd->variables.max_allowed_packet/count) { push_warning_printf(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN, ER_WARN_ALLOWED_PACKET_OVERFLOWED, ER(ER_WARN_ALLOWED_PACKET_OVERFLOWED), func_name(), current_thd->variables.max_allowed_packet); goto err; } tot_length= length*(uint) count; if (!(res= alloc_buffer(res,str,&tmp_value,tot_length))) goto err; to=(char*) res->ptr()+length; while (--count) { memcpy(to,res->ptr(),length); to+=length; } return (res); err: null_value=1; return 0; } void Item_func_rpad::fix_length_and_dec() { Item *cargs[2]; cargs[0]= args[0]; cargs[1]= args[2]; if (agg_arg_charsets(collation, cargs, 2, MY_COLL_ALLOW_CONV)) return; args[0]= cargs[0]; args[2]= cargs[1]; if (args[1]->const_item()) { ulonglong length= ((ulonglong) args[1]->val_int() * collation.collation->mbmaxlen); if (length >= MAX_BLOB_WIDTH) { length= MAX_BLOB_WIDTH; maybe_null= 1; } max_length= (ulong) length; } else { max_length= MAX_BLOB_WIDTH; maybe_null= 1; } } String *Item_func_rpad::val_str(String *str) { DBUG_ASSERT(fixed == 1); uint32 res_byte_length,res_char_length,pad_char_length,pad_byte_length; char *to; const char *ptr_pad; int32 count= (int32) args[1]->val_int(); int32 byte_count= count * collation.collation->mbmaxlen; String *res =args[0]->val_str(str); String *rpad = args[2]->val_str(&rpad_str); if (!res || args[1]->null_value || !rpad || count < 0) goto err; null_value=0; if (count <= (int32) (res_char_length=res->numchars())) { // String to pad is big enough res->length(res->charpos(count)); // Shorten result if longer return (res); } pad_char_length= rpad->numchars(); if ((ulong) byte_count > current_thd->variables.max_allowed_packet) { push_warning_printf(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN, ER_WARN_ALLOWED_PACKET_OVERFLOWED, ER(ER_WARN_ALLOWED_PACKET_OVERFLOWED), func_name(), current_thd->variables.max_allowed_packet); goto err; } if(args[2]->null_value || !pad_char_length) goto err; res_byte_length= res->length(); /* Must be done before alloc_buffer */ if (!(res= alloc_buffer(res,str,&tmp_value,byte_count))) goto err; to= (char*) res->ptr()+res_byte_length; ptr_pad=rpad->ptr(); pad_byte_length= rpad->length(); count-= res_char_length; for ( ; (uint32) count > pad_char_length; count-= pad_char_length) { memcpy(to,ptr_pad,pad_byte_length); to+= pad_byte_length; } if (count) { pad_byte_length= rpad->charpos(count); memcpy(to,ptr_pad,(size_t) pad_byte_length); to+= pad_byte_length; } res->length(to- (char*) res->ptr()); return (res); err: null_value=1; return 0; } void Item_func_lpad::fix_length_and_dec() { Item *cargs[2]; cargs[0]= args[0]; cargs[1]= args[2]; if (agg_arg_charsets(collation, cargs, 2, MY_COLL_ALLOW_CONV)) return; args[0]= cargs[0]; args[2]= cargs[1]; if (args[1]->const_item()) { ulonglong length= ((ulonglong) args[1]->val_int() * collation.collation->mbmaxlen); if (length >= MAX_BLOB_WIDTH) { length= MAX_BLOB_WIDTH; maybe_null= 1; } max_length= (ulong) length; } else { max_length= MAX_BLOB_WIDTH; maybe_null= 1; } } String *Item_func_lpad::val_str(String *str) { DBUG_ASSERT(fixed == 1); uint32 res_char_length,pad_char_length; ulong count= (long) args[1]->val_int(), byte_count; String *res= args[0]->val_str(&tmp_value); String *pad= args[2]->val_str(&lpad_str); if (!res || args[1]->null_value || !pad) goto err; null_value=0; res_char_length= res->numchars(); if (count <= res_char_length) { res->length(res->charpos(count)); return res; } pad_char_length= pad->numchars(); byte_count= count * collation.collation->mbmaxlen; if (byte_count > current_thd->variables.max_allowed_packet) { push_warning_printf(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN, ER_WARN_ALLOWED_PACKET_OVERFLOWED, ER(ER_WARN_ALLOWED_PACKET_OVERFLOWED), func_name(), current_thd->variables.max_allowed_packet); goto err; } if (args[2]->null_value || !pad_char_length || str->alloc(byte_count)) goto err; str->length(0); str->set_charset(collation.collation); count-= res_char_length; while (count >= pad_char_length) { str->append(*pad); count-= pad_char_length; } if (count > 0) str->append(pad->ptr(), pad->charpos(count), collation.collation); str->append(*res); null_value= 0; return str; err: null_value= 1; return 0; } String *Item_func_conv::val_str(String *str) { DBUG_ASSERT(fixed == 1); String *res= args[0]->val_str(str); char *endptr,ans[65],*ptr; longlong dec; int from_base= (int) args[1]->val_int(); int to_base= (int) args[2]->val_int(); int err; if (args[0]->null_value || args[1]->null_value || args[2]->null_value || abs(to_base) > 36 || abs(to_base) < 2 || abs(from_base) > 36 || abs(from_base) < 2 || !(res->length())) { null_value=1; return 0; } null_value=0; unsigned_flag= !(from_base < 0); if (from_base < 0) dec= my_strntoll(res->charset(),res->ptr(),res->length(),-from_base,&endptr,&err); else dec= (longlong) my_strntoull(res->charset(),res->ptr(),res->length(),from_base,&endptr,&err); ptr= longlong2str(dec,ans,to_base); if (str->copy(ans,(uint32) (ptr-ans), default_charset())) return &my_empty_string; return str; } String *Item_func_conv_charset::val_str(String *str) { DBUG_ASSERT(fixed == 1); if (use_cached_value) return null_value ? 0 : &str_value; String *arg= args[0]->val_str(str); uint dummy_errors; if (!arg) { null_value=1; return 0; } null_value= str_value.copy(arg->ptr(),arg->length(),arg->charset(), conv_charset, &dummy_errors); return null_value ? 0 : &str_value; } void Item_func_conv_charset::fix_length_and_dec() { collation.set(conv_charset, DERIVATION_IMPLICIT); max_length = args[0]->max_length*conv_charset->mbmaxlen; } void Item_func_conv_charset::print(String *str) { str->append("convert(", 8); args[0]->print(str); str->append(" using ", 7); str->append(conv_charset->csname); str->append(')'); } String *Item_func_set_collation::val_str(String *str) { DBUG_ASSERT(fixed == 1); str=args[0]->val_str(str); if ((null_value=args[0]->null_value)) return 0; str->set_charset(collation.collation); return str; } void Item_func_set_collation::fix_length_and_dec() { CHARSET_INFO *set_collation; const char *colname; String tmp, *str= args[1]->val_str(&tmp); colname= str->c_ptr(); if (colname == binary_keyword) set_collation= get_charset_by_csname(args[0]->collation.collation->csname, MY_CS_BINSORT,MYF(0)); else { if (!(set_collation= get_charset_by_name(colname,MYF(0)))) { my_error(ER_UNKNOWN_COLLATION, MYF(0), colname); return; } } if (!set_collation || !my_charset_same(args[0]->collation.collation,set_collation)) { my_error(ER_COLLATION_CHARSET_MISMATCH, MYF(0), colname,args[0]->collation.collation->csname); return; } collation.set(set_collation, DERIVATION_EXPLICIT); max_length= args[0]->max_length; } bool Item_func_set_collation::eq(const Item *item, bool binary_cmp) const { /* Assume we don't have rtti */ if (this == item) return 1; if (item->type() != FUNC_ITEM) return 0; Item_func *item_func=(Item_func*) item; if (arg_count != item_func->arg_count || func_name() != item_func->func_name()) return 0; Item_func_set_collation *item_func_sc=(Item_func_set_collation*) item; if (collation.collation != item_func_sc->collation.collation) return 0; for (uint i=0; i < arg_count ; i++) if (!args[i]->eq(item_func_sc->args[i], binary_cmp)) return 0; return 1; } String *Item_func_charset::val_str(String *str) { DBUG_ASSERT(fixed == 1); uint dummy_errors; CHARSET_INFO *cs= args[0]->collation.collation; null_value= 0; str->copy(cs->csname, strlen(cs->csname), &my_charset_latin1, collation.collation, &dummy_errors); return str; } String *Item_func_collation::val_str(String *str) { DBUG_ASSERT(fixed == 1); uint dummy_errors; CHARSET_INFO *cs= args[0]->collation.collation; null_value= 0; str->copy(cs->name, strlen(cs->name), &my_charset_latin1, collation.collation, &dummy_errors); return str; } String *Item_func_hex::val_str(String *str) { DBUG_ASSERT(fixed == 1); if (args[0]->result_type() != STRING_RESULT) { ulonglong dec; char ans[65],*ptr; /* Return hex of unsigned longlong value */ if (args[0]->result_type() == REAL_RESULT) { double val= args[0]->val(); if ((val <= (double) LONGLONG_MIN) || (val >= (double) (ulonglong) ULONGLONG_MAX)) dec= ~(longlong) 0; else dec= (ulonglong) (val + (val > 0 ? 0.5 : -0.5)); } else dec= (ulonglong) args[0]->val_int(); if ((null_value= args[0]->null_value)) return 0; ptr= longlong2str(dec,ans,16); if (str->copy(ans,(uint32) (ptr-ans),default_charset())) return &my_empty_string; // End of memory return str; } /* Convert given string to a hex string, character by character */ String *res= args[0]->val_str(str); const char *from, *end; char *to; if (!res || tmp_value.alloc(res->length()*2)) { null_value=1; return 0; } null_value=0; tmp_value.length(res->length()*2); for (from=res->ptr(), end=from+res->length(), to= (char*) tmp_value.ptr(); from < end ; from++, to+=2) { uint tmp=(uint) (uchar) *from; to[0]=_dig_vec_upper[tmp >> 4]; to[1]=_dig_vec_upper[tmp & 15]; } return &tmp_value; } /* Convert given hex string to a binary string */ String *Item_func_unhex::val_str(String *str) { const char *from, *end; char *to; String *res; uint length; DBUG_ASSERT(fixed == 1); res= args[0]->val_str(str); if (!res || tmp_value.alloc(length= (1+res->length())/2)) { null_value=1; return 0; } from= res->ptr(); null_value= 0; tmp_value.length(length); to= (char*) tmp_value.ptr(); if (res->length() % 2) { int hex_char; *to++= hex_char= hexchar_to_int(*from++); if ((null_value= (hex_char == -1))) return 0; } for (end=res->ptr()+res->length(); from < end ; from+=2, to++) { int hex_char; *to= (hex_char= hexchar_to_int(from[0])) << 4; if ((null_value= (hex_char == -1))) return 0; *to|= hex_char= hexchar_to_int(from[1]); if ((null_value= (hex_char == -1))) return 0; } return &tmp_value; } void Item_func_binary::print(String *str) { str->append("cast(", 5); args[0]->print(str); str->append(" as binary)", 11); } #include // For my_stat String *Item_load_file::val_str(String *str) { DBUG_ASSERT(fixed == 1); String *file_name; File file; MY_STAT stat_info; char path[FN_REFLEN]; DBUG_ENTER("load_file"); if (!(file_name= args[0]->val_str(str)) #ifndef NO_EMBEDDED_ACCESS_CHECKS || !(current_thd->master_access & FILE_ACL) #endif ) goto err; (void) fn_format(path, file_name->c_ptr(), mysql_real_data_home, "", MY_RELATIVE_PATH | MY_UNPACK_FILENAME); if (!my_stat(path, &stat_info, MYF(0))) goto err; if (!(stat_info.st_mode & S_IROTH)) { /* my_error(ER_TEXTFILE_NOT_READABLE, MYF(0), file_name->c_ptr()); */ goto err; } if (stat_info.st_size > (long) current_thd->variables.max_allowed_packet) { push_warning_printf(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN, ER_WARN_ALLOWED_PACKET_OVERFLOWED, ER(ER_WARN_ALLOWED_PACKET_OVERFLOWED), func_name(), current_thd->variables.max_allowed_packet); goto err; } if (tmp_value.alloc(stat_info.st_size)) goto err; if ((file = my_open(file_name->c_ptr(), O_RDONLY, MYF(0))) < 0) goto err; if (my_read(file, (byte*) tmp_value.ptr(), stat_info.st_size, MYF(MY_NABP))) { my_close(file, MYF(0)); goto err; } tmp_value.length(stat_info.st_size); my_close(file, MYF(0)); null_value = 0; return &tmp_value; err: null_value = 1; DBUG_RETURN(0); } String* Item_func_export_set::val_str(String* str) { DBUG_ASSERT(fixed == 1); ulonglong the_set = (ulonglong) args[0]->val_int(); String yes_buf, *yes; yes = args[1]->val_str(&yes_buf); String no_buf, *no; no = args[2]->val_str(&no_buf); String *sep = NULL, sep_buf ; uint num_set_values = 64; ulonglong mask = 0x1; str->length(0); str->set_charset(collation.collation); /* Check if some argument is a NULL value */ if (args[0]->null_value || args[1]->null_value || args[2]->null_value) { null_value=1; return 0; } /* Arg count can only be 3, 4 or 5 here. This is guaranteed from the grammar for EXPORT_SET() */ switch(arg_count) { case 5: num_set_values = (uint) args[4]->val_int(); if (num_set_values > 64) num_set_values=64; if (args[4]->null_value) { null_value=1; return 0; } /* Fall through */ case 4: if (!(sep = args[3]->val_str(&sep_buf))) // Only true if NULL { null_value=1; return 0; } break; case 3: sep_buf.set(",", 1, default_charset()); sep = &sep_buf; break; default: DBUG_ASSERT(0); // cannot happen } null_value=0; for (uint i = 0; i < num_set_values; i++, mask = (mask << 1)) { if (the_set & mask) str->append(*yes); else str->append(*no); if (i != num_set_values - 1) str->append(*sep); } return str; } void Item_func_export_set::fix_length_and_dec() { uint length=max(args[1]->max_length,args[2]->max_length); uint sep_length=(arg_count > 3 ? args[3]->max_length : 1); max_length=length*64+sep_length*63; if (agg_arg_charsets(collation, args+1, min(4,arg_count)-1), MY_COLL_ALLOW_CONV) return; } String* Item_func_inet_ntoa::val_str(String* str) { DBUG_ASSERT(fixed == 1); uchar buf[8], *p; ulonglong n = (ulonglong) args[0]->val_int(); char num[4]; /* We do not know if args[0] is NULL until we have called some val function on it if args[0] is not a constant! Also return null if n > 255.255.255.255 */ if ((null_value= (args[0]->null_value || n > (ulonglong) LL(4294967295)))) return 0; // Null value str->length(0); int4store(buf,n); /* Now we can assume little endian. */ num[3]='.'; for (p=buf+4 ; p-- > buf ; ) { uint c = *p; uint n1,n2; // Try to avoid divisions n1= c / 100; // 100 digits c-= n1*100; n2= c / 10; // 10 digits c-=n2*10; // last digit num[0]=(char) n1+'0'; num[1]=(char) n2+'0'; num[2]=(char) c+'0'; uint length=(n1 ? 4 : n2 ? 3 : 2); // Remove pre-zero (void) str->append(num+4-length,length); } str->length(str->length()-1); // Remove last '.'; return str; } /* QUOTE() function returns argument string in single quotes suitable for using in a SQL statement. DESCRIPTION Adds a \ before all characters that needs to be escaped in a SQL string. We also escape '^Z' (END-OF-FILE in windows) to avoid probelms when running commands from a file in windows. This function is very useful when you want to generate SQL statements NOTE QUOTE(NULL) returns the string 'NULL' (4 letters, without quotes). RETURN VALUES str Quoted string NULL Out of memory. */ #define get_esc_bit(mask, num) (1 & (*((mask) + ((num) >> 3))) >> ((num) & 7)) String *Item_func_quote::val_str(String *str) { DBUG_ASSERT(fixed == 1); /* Bit mask that has 1 for set for the position of the following characters: 0, \, ' and ^Z */ static uchar escmask[32]= { 0x01, 0x00, 0x00, 0x04, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; char *from, *to, *end, *start; String *arg= args[0]->val_str(str); uint arg_length, new_length; if (!arg) // Null argument { str->copy("NULL", 4, collation.collation); // Return the string 'NULL' null_value= 0; return str; } arg_length= arg->length(); new_length= arg_length+2; /* for beginning and ending ' signs */ for (from= (char*) arg->ptr(), end= from + arg_length; from < end; from++) new_length+= get_esc_bit(escmask, (uchar) *from); if (tmp_value.alloc(new_length)) goto null; /* We replace characters from the end to the beginning */ to= (char*) tmp_value.ptr() + new_length - 1; *to--= '\''; for (start= (char*) arg->ptr(),end= start + arg_length; end-- != start; to--) { /* We can't use the bitmask here as we want to replace \O and ^Z with 0 and Z */ switch (*end) { case 0: *to--= '0'; *to= '\\'; break; case '\032': *to--= 'Z'; *to= '\\'; break; case '\'': case '\\': *to--= *end; *to= '\\'; break; default: *to= *end; break; } } *to= '\''; tmp_value.length(new_length); tmp_value.set_charset(collation.collation); null_value= 0; return &tmp_value; null: null_value= 1; return 0; } longlong Item_func_uncompressed_length::val_int() { DBUG_ASSERT(fixed == 1); String *res= args[0]->val_str(&value); if (!res) { null_value=1; return 0; /* purecov: inspected */ } null_value=0; if (res->is_empty()) return 0; /* res->ptr() using is safe because we have tested that string is not empty, res->c_ptr() is not used because: - we do not need \0 terminated string to get first 4 bytes - c_ptr() tests simbol after string end (uninitialiozed memory) which confuse valgrind */ return uint4korr(res->ptr()) & 0x3FFFFFFF; } longlong Item_func_crc32::val_int() { DBUG_ASSERT(fixed == 1); String *res=args[0]->val_str(&value); if (!res) { null_value=1; return 0; /* purecov: inspected */ } null_value=0; return (longlong) crc32(0L, (uchar*)res->ptr(), res->length()); } #ifdef HAVE_COMPRESS #include "zlib.h" String *Item_func_compress::val_str(String *str) { int err= Z_OK, code; ulong new_size; String *res; Byte *body; char *tmp, *last_char; DBUG_ASSERT(fixed == 1); if (!(res= args[0]->val_str(str))) { null_value= 1; return 0; } if (res->is_empty()) return res; /* Citation from zlib.h (comment for compress function): Compresses the source buffer into the destination buffer. sourceLen is the byte length of the source buffer. Upon entry, destLen is the total size of the destination buffer, which must be at least 0.1% larger than sourceLen plus 12 bytes. We assume here that the buffer can't grow more than .25 %. */ new_size= res->length() + res->length() / 5 + 12; // Check new_size overflow: new_size <= res->length() if (((uint32) (new_size+5) <= res->length()) || buffer.realloc((uint32) new_size + 4 + 1)) { null_value= 1; return 0; } body= ((Byte*)buffer.ptr()) + 4; // As far as we have checked res->is_empty() we can use ptr() if ((err= compress(body, &new_size, (const Bytef*)res->ptr(), res->length())) != Z_OK) { code= err==Z_MEM_ERROR ? ER_ZLIB_Z_MEM_ERROR : ER_ZLIB_Z_BUF_ERROR; push_warning(current_thd,MYSQL_ERROR::WARN_LEVEL_ERROR,code,ER(code)); null_value= 1; return 0; } tmp= (char*)buffer.ptr(); // int4store is a macro; avoid side effects int4store(tmp, res->length() & 0x3FFFFFFF); /* This is to ensure that things works for CHAR fields, which trim ' ': */ last_char= ((char*)body)+new_size-1; if (*last_char == ' ') { *++last_char= '.'; new_size++; } buffer.length((uint32)new_size + 4); return &buffer; } String *Item_func_uncompress::val_str(String *str) { DBUG_ASSERT(fixed == 1); String *res= args[0]->val_str(str); ulong new_size; int err; uint code; if (!res) goto err; null_value= 0; if (res->is_empty()) return res; new_size= uint4korr(res->ptr()) & 0x3FFFFFFF; if (new_size > current_thd->variables.max_allowed_packet) { push_warning_printf(current_thd,MYSQL_ERROR::WARN_LEVEL_ERROR, ER_TOO_BIG_FOR_UNCOMPRESS, ER(ER_TOO_BIG_FOR_UNCOMPRESS), current_thd->variables.max_allowed_packet); goto err; } if (buffer.realloc((uint32)new_size)) goto err; if ((err= uncompress((Byte*)buffer.ptr(), &new_size, ((const Bytef*)res->ptr())+4,res->length())) == Z_OK) { buffer.length((uint32) new_size); return &buffer; } code= ((err == Z_BUF_ERROR) ? ER_ZLIB_Z_BUF_ERROR : ((err == Z_MEM_ERROR) ? ER_ZLIB_Z_MEM_ERROR : ER_ZLIB_Z_DATA_ERROR)); push_warning(current_thd,MYSQL_ERROR::WARN_LEVEL_ERROR,code,ER(code)); err: null_value= 1; return 0; } #endif /* UUID, as in DCE 1.1: Remote Procedure Call, Open Group Technical Standard Document Number C706, October 1997, (supersedes C309 DCE: Remote Procedure Call 8/1994, which was basis for ISO/IEC 11578:1996 specification) */ static struct rand_struct uuid_rand; static uint nanoseq; static ulonglong uuid_time=0; static char clock_seq_and_node_str[]="-0000-000000000000"; /* number of 100-nanosecond intervals between 1582-10-15 00:00:00.00 and 1970-01-01 00:00:00.00 */ #define UUID_TIME_OFFSET ((ulonglong) 141427 * 24 * 60 * 60 * 1000 * 10 ) #define UUID_VERSION 0x1000 #define UUID_VARIANT 0x8000 static void tohex(char *to, uint from, uint len) { to+= len; while (len--) { *--to= _dig_vec_lower[from & 15]; from >>= 4; } } static void set_clock_seq_str() { uint16 clock_seq= ((uint)(my_rnd(&uuid_rand)*16383)) | UUID_VARIANT; tohex(clock_seq_and_node_str+1, clock_seq, 4); nanoseq= 0; } String *Item_func_uuid::val_str(String *str) { DBUG_ASSERT(fixed == 1); char *s; pthread_mutex_lock(&LOCK_uuid_generator); if (! uuid_time) /* first UUID() call. initializing data */ { ulong tmp=sql_rnd_with_mutex(); uchar mac[6]; int i; if (my_gethwaddr(mac)) { /* generating random "hardware addr" and because specs explicitly specify that it should NOT correlate with a clock_seq value (initialized random below), we use a separate randominit() here */ randominit(&uuid_rand, tmp + (ulong)current_thd, tmp + query_id); for (i=0; i < (int)sizeof(mac); i++) mac[i]=(uchar)(my_rnd(&uuid_rand)*255); } s=clock_seq_and_node_str+sizeof(clock_seq_and_node_str)-1; for (i=sizeof(mac)-1 ; i>=0 ; i--) { *--s=_dig_vec_lower[mac[i] & 15]; *--s=_dig_vec_lower[mac[i] >> 4]; } randominit(&uuid_rand, tmp + (ulong)start_time, tmp + bytes_sent); set_clock_seq_str(); } ulonglong tv=my_getsystime() + UUID_TIME_OFFSET + nanoseq; if (unlikely(tv < uuid_time)) set_clock_seq_str(); else if (unlikely(tv == uuid_time)) { /* special protection from low-res system clocks */ nanoseq++; tv++; } else { if (nanoseq) { tv-=nanoseq; nanoseq=0; } DBUG_ASSERT(tv > uuid_time); } uuid_time=tv; pthread_mutex_unlock(&LOCK_uuid_generator); uint32 time_low= (uint32) (tv & 0xFFFFFFFF); uint16 time_mid= (uint16) ((tv >> 32) & 0xFFFF); uint16 time_hi_and_version= (uint16) ((tv >> 48) | UUID_VERSION); str->realloc(UUID_LENGTH+1); str->length(UUID_LENGTH); str->set_charset(system_charset_info); s=(char *) str->ptr(); s[8]=s[13]='-'; tohex(s, time_low, 8); tohex(s+9, time_mid, 4); tohex(s+14, time_hi_and_version, 4); strmov(s+18, clock_seq_and_node_str); return str; }