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mariadb/client/mysqlshow.c
Davi Arnaut 6f3a540c37 Bug#42733: Type-punning warnings when compiling MySQL -- 
strict aliasing violations.

Essentially, the problem is that large parts of the server were
developed in simpler times (last decades, pre C99 standard) when
strict aliasing and compilers supporting such optimizations were
rare to non-existent. Thus, when compiling the server with a modern
compiler that uses strict aliasing rules to perform optimizations,
there are several places in the code that might trigger undefined
behavior.

As evinced by some recent bugs, GCC does a somewhat good of job
misoptimizing such code, but on the other hand also gives warnings
about suspicious code. One problem is that the warnings aren't
always accurate, yet we can't afford to just shut them off as we
might miss real cases. False-positive cases are aggravated mostly
by casts that are likely to trigger undefined behavior.

The solution is to start a cleanup process focused on fixing and
reducing the amount of strict-aliasing related warnings produced
by GCC and others compilers. A good deal of noise reduction can
be achieved by just removing useless casts that are product of
historical cruft and are likely to trigger undefined behavior if
dereferenced.

client/mysql.cc:
  Remove now-unnecessary casts.
  Break up large strings.
client/mysql_upgrade.c:
  Remove now-unnecessary casts.
client/mysqladmin.cc:
  Remove now-unnecessary casts.
  Break up large strings.
client/mysqlbinlog.cc:
  Remove now-unnecessary casts.
client/mysqlcheck.c:
  Remove now-unnecessary casts.
client/mysqldump.c:
  Remove now-unnecessary casts.
client/mysqlimport.c:
  Remove now-unnecessary casts.
client/mysqlshow.c:
  Remove now-unnecessary casts.
client/mysqlslap.c:
  Remove now-unnecessary casts.
client/mysqltest.cc:
  Remove now-unnecessary casts.
extra/comp_err.c:
  Remove now-unnecessary casts.
extra/my_print_defaults.c:
  Remove now-unnecessary casts.
  Break up large strings.
extra/mysql_waitpid.c:
  Remove now-unnecessary casts.
extra/perror.c:
  Remove now-unnecessary casts.
extra/resolve_stack_dump.c:
  Remove now-unnecessary casts.
extra/resolveip.c:
  Remove now-unnecessary casts.
include/my_getopt.h:
  Use a void pointer type as the opaque type to avoid problems with type
  incompatibility -- GCC issues warnings when the type name is not type
  compatible with a operand. As a side bonus, a explicit cast won't be
  necessary anymore.
include/sslopt-longopts.h:
  Remove now-unnecessary casts.
  Break up large strings.
mysys/my_getopt.c:
  Update opaque type and introduce a type definition for the
  argument to my_getopt_register_get_addr.
server-tools/instance-manager/options.cc:
  Remove now-unnecessary casts.
sql/mysqld.cc:
  Remove now-unnecessary casts.
  Break up large strings.
  Update mysql_getopt_value prototype (the old prototype
  was different from the definition anyway).
sql/sql_plugin.cc:
  The type of a pointer to a function must be compatible with the
  pointed-to function type, otherwise the behavior is undefined.
sql/table.cc:
  The variable buf pointer to pointer to pointer to constant char
  could improperly alias a incompatible type in call to fix_type_
  pointers. Since this was actually dead code, it is simply removed.
sql/unireg.cc:
  Remove call to get_form_pos. The code creates a new FRM file which
  is always truncated and writes the form position as 0. Hence, no
  need to retrieve it, we now for sure it is 0.
storage/archive/archive_reader.c:
  Remove now-unnecessary casts.
storage/myisam/ft_nlq_search.c:
  Read weight directly from the buffer.
storage/myisam/fulltext.h:
  Add explanation about the type duality of a key buffer.
  Add accessor macro to retrieve a FT float value.
storage/myisam/mi_test1.c:
  Remove now-unnecessary casts.
storage/myisam/myisam_ftdump.c:
  Read weight directly from the buffer.
storage/myisam/myisamchk.c:
  Remove now-unnecessary casts.
storage/myisam/myisamlog.c:
  A pointer to char was used to alias a pointer to pointer to
  unsigned char, thus violating strict aliasing rules.
storage/myisam/myisampack.c:
  Remove now-unnecessary casts.
strings/decimal.c:
  Remove aliasing violation, printing the value is enough for
  debugging purposes.
tests/mysql_client_test.c:
  Remove now-unnecessary casts.
2010-06-10 17:16:43 -03:00

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/* Copyright (C) 2000-2006 MySQL 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; version 2 of the License.
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 */
/* Show databases, tables or columns */
#define SHOW_VERSION "9.10"
#include "client_priv.h"
#include <my_sys.h>
#include <m_string.h>
#include <mysql.h>
#include <mysqld_error.h>
#include <signal.h>
#include <stdarg.h>
#include <sslopt-vars.h>
static char * host=0, *opt_password=0, *user=0;
static my_bool opt_show_keys= 0, opt_compress= 0, opt_count=0, opt_status= 0;
static my_bool tty_password= 0, opt_table_type= 0;
static my_bool debug_info_flag= 0, debug_check_flag= 0;
static uint my_end_arg= 0;
static uint opt_verbose=0;
static char *default_charset= (char*) MYSQL_DEFAULT_CHARSET_NAME;
#ifdef HAVE_SMEM
static char *shared_memory_base_name=0;
#endif
static uint opt_protocol=0;
static void get_options(int *argc,char ***argv);
static uint opt_mysql_port=0;
static int list_dbs(MYSQL *mysql,const char *wild);
static int list_tables(MYSQL *mysql,const char *db,const char *table);
static int list_table_status(MYSQL *mysql,const char *db,const char *table);
static int list_fields(MYSQL *mysql,const char *db,const char *table,
const char *field);
static void print_header(const char *header,uint head_length,...);
static void print_row(const char *header,uint head_length,...);
static void print_trailer(uint length,...);
static void print_res_header(MYSQL_RES *result);
static void print_res_top(MYSQL_RES *result);
static void print_res_row(MYSQL_RES *result,MYSQL_ROW cur);
static const char *load_default_groups[]= { "mysqlshow","client",0 };
static char * opt_mysql_unix_port=0;
int main(int argc, char **argv)
{
int error;
my_bool first_argument_uses_wildcards=0;
char *wild;
MYSQL mysql;
MY_INIT(argv[0]);
load_defaults("my",load_default_groups,&argc,&argv);
get_options(&argc,&argv);
wild=0;
if (argc)
{
char *pos= argv[argc-1], *to;
for (to= pos ; *pos ; pos++, to++)
{
switch (*pos) {
case '*':
*pos= '%';
first_argument_uses_wildcards= 1;
break;
case '?':
*pos= '_';
first_argument_uses_wildcards= 1;
break;
case '%':
case '_':
first_argument_uses_wildcards= 1;
break;
case '\\':
pos++;
default: break;
}
*to= *pos;
}
*to= *pos; /* just to copy a '\0' if '\\' was used */
}
if (first_argument_uses_wildcards)
wild= argv[--argc];
else if (argc == 3) /* We only want one field */
wild= argv[--argc];
if (argc > 2)
{
fprintf(stderr,"%s: Too many arguments\n",my_progname);
exit(1);
}
mysql_init(&mysql);
if (opt_compress)
mysql_options(&mysql,MYSQL_OPT_COMPRESS,NullS);
#ifdef HAVE_OPENSSL
if (opt_use_ssl)
mysql_ssl_set(&mysql, opt_ssl_key, opt_ssl_cert, opt_ssl_ca,
opt_ssl_capath, opt_ssl_cipher);
mysql_options(&mysql,MYSQL_OPT_SSL_VERIFY_SERVER_CERT,
(char*)&opt_ssl_verify_server_cert);
#endif
if (opt_protocol)
mysql_options(&mysql,MYSQL_OPT_PROTOCOL,(char*)&opt_protocol);
#ifdef HAVE_SMEM
if (shared_memory_base_name)
mysql_options(&mysql,MYSQL_SHARED_MEMORY_BASE_NAME,shared_memory_base_name);
#endif
mysql_options(&mysql, MYSQL_SET_CHARSET_NAME, default_charset);
if (!(mysql_real_connect(&mysql,host,user,opt_password,
(first_argument_uses_wildcards) ? "" :
argv[0],opt_mysql_port,opt_mysql_unix_port,
0)))
{
fprintf(stderr,"%s: %s\n",my_progname,mysql_error(&mysql));
exit(1);
}
mysql.reconnect= 1;
switch (argc) {
case 0: error=list_dbs(&mysql,wild); break;
case 1:
if (opt_status)
error=list_table_status(&mysql,argv[0],wild);
else
error=list_tables(&mysql,argv[0],wild);
break;
default:
if (opt_status && ! wild)
error=list_table_status(&mysql,argv[0],argv[1]);
else
error=list_fields(&mysql,argv[0],argv[1],wild);
break;
}
mysql_close(&mysql); /* Close & free connection */
if (opt_password)
my_free(opt_password,MYF(0));
#ifdef HAVE_SMEM
my_free(shared_memory_base_name,MYF(MY_ALLOW_ZERO_PTR));
#endif
my_end(my_end_arg);
exit(error ? 1 : 0);
return 0; /* No compiler warnings */
}
static struct my_option my_long_options[] =
{
#ifdef __NETWARE__
{"autoclose", OPT_AUTO_CLOSE, "Automatically close the screen on exit for Netware.",
0, 0, 0, GET_NO_ARG, NO_ARG, 0, 0, 0, 0, 0, 0},
#endif
{"character-sets-dir", 'c', "Directory for character set files.",
&charsets_dir, &charsets_dir, 0, GET_STR, REQUIRED_ARG, 0,
0, 0, 0, 0, 0},
{"default-character-set", OPT_DEFAULT_CHARSET,
"Set the default character set.", &default_charset,
&default_charset, 0, GET_STR, REQUIRED_ARG, 0, 0, 0, 0, 0, 0},
{"count", OPT_COUNT,
"Show number of rows per table (may be slow for non-MyISAM tables).",
&opt_count, &opt_count, 0, GET_BOOL, NO_ARG, 0, 0, 0,
0, 0, 0},
{"compress", 'C', "Use compression in server/client protocol.",
&opt_compress, &opt_compress, 0, GET_BOOL, NO_ARG, 0, 0, 0,
0, 0, 0},
{"debug", '#', "Output debug log. Often this is 'd:t:o,filename'.",
0, 0, 0, GET_STR, OPT_ARG, 0, 0, 0, 0, 0, 0},
{"debug-check", OPT_DEBUG_CHECK, "Check memory and open file usage at exit.",
&debug_check_flag, &debug_check_flag, 0,
GET_BOOL, NO_ARG, 0, 0, 0, 0, 0, 0},
{"debug-info", OPT_DEBUG_INFO, "Print some debug info at exit.",
&debug_info_flag, &debug_info_flag,
0, GET_BOOL, NO_ARG, 0, 0, 0, 0, 0, 0},
{"help", '?', "Display this help and exit.", 0, 0, 0, GET_NO_ARG, NO_ARG,
0, 0, 0, 0, 0, 0},
{"host", 'h', "Connect to host.", &host, &host, 0, GET_STR,
REQUIRED_ARG, 0, 0, 0, 0, 0, 0},
{"status", 'i', "Shows a lot of extra information about each table.",
&opt_status, &opt_status, 0, GET_BOOL, NO_ARG, 0, 0, 0, 0,
0, 0},
{"keys", 'k', "Show keys for table.", &opt_show_keys,
&opt_show_keys, 0, GET_BOOL, NO_ARG, 0, 0, 0, 0, 0, 0},
{"password", 'p',
"Password to use when connecting to server. If password is not given, it's "
"solicited on the tty.",
0, 0, 0, GET_STR, OPT_ARG, 0, 0, 0, 0, 0, 0},
{"port", 'P', "Port number to use for connection or 0 for default to, in "
"order of preference, my.cnf, $MYSQL_TCP_PORT, "
#if MYSQL_PORT_DEFAULT == 0
"/etc/services, "
#endif
"built-in default (" STRINGIFY_ARG(MYSQL_PORT) ").",
&opt_mysql_port,
&opt_mysql_port, 0, GET_UINT, REQUIRED_ARG, 0, 0, 0, 0, 0,
0},
#ifdef __WIN__
{"pipe", 'W', "Use named pipes to connect to server.", 0, 0, 0, GET_NO_ARG,
NO_ARG, 0, 0, 0, 0, 0, 0},
#endif
{"protocol", OPT_MYSQL_PROTOCOL,
"The protocol to use for connection (tcp, socket, pipe, memory).",
0, 0, 0, GET_STR, REQUIRED_ARG, 0, 0, 0, 0, 0, 0},
#ifdef HAVE_SMEM
{"shared-memory-base-name", OPT_SHARED_MEMORY_BASE_NAME,
"Base name of shared memory.", &shared_memory_base_name,
&shared_memory_base_name, 0, GET_STR_ALLOC, REQUIRED_ARG,
0, 0, 0, 0, 0, 0},
#endif
{"show-table-type", 't', "Show table type column.",
&opt_table_type, &opt_table_type, 0, GET_BOOL,
NO_ARG, 0, 0, 0, 0, 0, 0},
{"socket", 'S', "The socket file to use for connection.",
&opt_mysql_unix_port, &opt_mysql_unix_port, 0, GET_STR,
REQUIRED_ARG, 0, 0, 0, 0, 0, 0},
#include <sslopt-longopts.h>
#ifndef DONT_ALLOW_USER_CHANGE
{"user", 'u', "User for login if not current user.", &user,
&user, 0, GET_STR, REQUIRED_ARG, 0, 0, 0, 0, 0, 0},
#endif
{"verbose", 'v',
"More verbose output; you can use this multiple times to get even more "
"verbose output.",
0, 0, 0, GET_NO_ARG, NO_ARG, 0, 0, 0, 0, 0, 0},
{"version", 'V', "Output version information and exit.", 0, 0, 0, GET_NO_ARG,
NO_ARG, 0, 0, 0, 0, 0, 0},
{0, 0, 0, 0, 0, 0, GET_NO_ARG, NO_ARG, 0, 0, 0, 0, 0, 0}
};
#include <help_start.h>
static void print_version(void)
{
printf("%s Ver %s Distrib %s, for %s (%s)\n",my_progname,SHOW_VERSION,
MYSQL_SERVER_VERSION,SYSTEM_TYPE,MACHINE_TYPE);
NETWARE_SET_SCREEN_MODE(1);
}
static void usage(void)
{
print_version();
puts("Copyright 2000-2008 MySQL AB, 2008 Sun Microsystems, Inc.");
puts("This software comes with ABSOLUTELY NO WARRANTY. This is free software,\nand you are welcome to modify and redistribute it under the GPL license.\n");
puts("Shows the structure of a MySQL database (databases, tables, and columns).\n");
printf("Usage: %s [OPTIONS] [database [table [column]]]\n",my_progname);
puts("\n\
If last argument contains a shell or SQL wildcard (*,?,% or _) then only\n\
what\'s matched by the wildcard is shown.\n\
If no database is given then all matching databases are shown.\n\
If no table is given, then all matching tables in database are shown.\n\
If no column is given, then all matching columns and column types in table\n\
are shown.");
print_defaults("my",load_default_groups);
my_print_help(my_long_options);
my_print_variables(my_long_options);
}
#include <help_end.h>
static my_bool
get_one_option(int optid, const struct my_option *opt __attribute__((unused)),
char *argument)
{
switch(optid) {
#ifdef __NETWARE__
case OPT_AUTO_CLOSE:
setscreenmode(SCR_AUTOCLOSE_ON_EXIT);
break;
#endif
case 'v':
opt_verbose++;
break;
case 'p':
if (argument == disabled_my_option)
argument= (char*) ""; /* Don't require password */
if (argument)
{
char *start=argument;
my_free(opt_password,MYF(MY_ALLOW_ZERO_PTR));
opt_password=my_strdup(argument,MYF(MY_FAE));
while (*argument) *argument++= 'x'; /* Destroy argument */
if (*start)
start[1]=0; /* Cut length of argument */
tty_password= 0;
}
else
tty_password=1;
break;
case 'W':
#ifdef __WIN__
opt_protocol = MYSQL_PROTOCOL_PIPE;
#endif
break;
case OPT_MYSQL_PROTOCOL:
opt_protocol= find_type_or_exit(argument, &sql_protocol_typelib,
opt->name);
break;
case '#':
DBUG_PUSH(argument ? argument : "d:t:o");
debug_check_flag= 1;
break;
#include <sslopt-case.h>
case 'V':
print_version();
exit(0);
break;
case '?':
case 'I': /* Info */
usage();
exit(0);
}
return 0;
}
static void
get_options(int *argc,char ***argv)
{
int ho_error;
if ((ho_error=handle_options(argc, argv, my_long_options, get_one_option)))
exit(ho_error);
if (tty_password)
opt_password=get_tty_password(NullS);
if (opt_count)
{
/*
We need to set verbose to 2 as we need to change the output to include
the number-of-rows column
*/
opt_verbose= 2;
}
if (debug_info_flag)
my_end_arg= MY_CHECK_ERROR | MY_GIVE_INFO;
if (debug_check_flag)
my_end_arg= MY_CHECK_ERROR;
return;
}
static int
list_dbs(MYSQL *mysql,const char *wild)
{
const char *header;
uint length, counter = 0;
ulong rowcount = 0L;
char tables[NAME_LEN+1], rows[NAME_LEN+1];
char query[255];
MYSQL_FIELD *field;
MYSQL_RES *result;
MYSQL_ROW row= NULL, rrow;
if (!(result=mysql_list_dbs(mysql,wild)))
{
fprintf(stderr,"%s: Cannot list databases: %s\n",my_progname,
mysql_error(mysql));
return 1;
}
/*
If a wildcard was used, but there was only one row and it's name is an
exact match, we'll assume they really wanted to see the contents of that
database. This is because it is fairly common for database names to
contain the underscore (_), like INFORMATION_SCHEMA.
*/
if (wild && mysql_num_rows(result) == 1)
{
row= mysql_fetch_row(result);
if (!my_strcasecmp(&my_charset_latin1, row[0], wild))
{
mysql_free_result(result);
if (opt_status)
return list_table_status(mysql, wild, NULL);
else
return list_tables(mysql, wild, NULL);
}
}
if (wild)
printf("Wildcard: %s\n",wild);
header="Databases";
length=(uint) strlen(header);
field=mysql_fetch_field(result);
if (length < field->max_length)
length=field->max_length;
if (!opt_verbose)
print_header(header,length,NullS);
else if (opt_verbose == 1)
print_header(header,length,"Tables",6,NullS);
else
print_header(header,length,"Tables",6,"Total Rows",12,NullS);
/* The first row may have already been read up above. */
while (row || (row= mysql_fetch_row(result)))
{
counter++;
if (opt_verbose)
{
if (!(mysql_select_db(mysql,row[0])))
{
MYSQL_RES *tresult = mysql_list_tables(mysql,(char*)NULL);
if (mysql_affected_rows(mysql) > 0)
{
sprintf(tables,"%6lu",(ulong) mysql_affected_rows(mysql));
rowcount = 0;
if (opt_verbose > 1)
{
/* Print the count of tables and rows for each database */
MYSQL_ROW trow;
while ((trow = mysql_fetch_row(tresult)))
{
sprintf(query,"SELECT COUNT(*) FROM `%s`",trow[0]);
if (!(mysql_query(mysql,query)))
{
MYSQL_RES *rresult;
if ((rresult = mysql_store_result(mysql)))
{
rrow = mysql_fetch_row(rresult);
rowcount += (ulong) strtoull(rrow[0], (char**) 0, 10);
mysql_free_result(rresult);
}
}
}
sprintf(rows,"%12lu",rowcount);
}
}
else
{
sprintf(tables,"%6d",0);
sprintf(rows,"%12d",0);
}
mysql_free_result(tresult);
}
else
{
strmov(tables,"N/A");
strmov(rows,"N/A");
}
}
if (!opt_verbose)
print_row(row[0],length,0);
else if (opt_verbose == 1)
print_row(row[0],length,tables,6,NullS);
else
print_row(row[0],length,tables,6,rows,12,NullS);
row= NULL;
}
print_trailer(length,
(opt_verbose > 0 ? 6 : 0),
(opt_verbose > 1 ? 12 :0),
0);
if (counter && opt_verbose)
printf("%u row%s in set.\n",counter,(counter > 1) ? "s" : "");
mysql_free_result(result);
return 0;
}
static int
list_tables(MYSQL *mysql,const char *db,const char *table)
{
const char *header;
uint head_length, counter = 0;
char query[255], rows[NAME_LEN], fields[16];
MYSQL_FIELD *field;
MYSQL_RES *result;
MYSQL_ROW row, rrow;
if (mysql_select_db(mysql,db))
{
fprintf(stderr,"%s: Cannot connect to db %s: %s\n",my_progname,db,
mysql_error(mysql));
return 1;
}
if (table)
{
/*
We just hijack the 'rows' variable for a bit to store the escaped
table name
*/
mysql_real_escape_string(mysql, rows, table, (unsigned long)strlen(table));
my_snprintf(query, sizeof(query), "show%s tables like '%s'",
opt_table_type ? " full" : "", rows);
}
else
my_snprintf(query, sizeof(query), "show%s tables",
opt_table_type ? " full" : "");
if (mysql_query(mysql, query) || !(result= mysql_store_result(mysql)))
{
fprintf(stderr,"%s: Cannot list tables in %s: %s\n",my_progname,db,
mysql_error(mysql));
exit(1);
}
printf("Database: %s",db);
if (table)
printf(" Wildcard: %s",table);
putchar('\n');
header="Tables";
head_length=(uint) strlen(header);
field=mysql_fetch_field(result);
if (head_length < field->max_length)
head_length=field->max_length;
if (opt_table_type)
{
if (!opt_verbose)
print_header(header,head_length,"table_type",10,NullS);
else if (opt_verbose == 1)
print_header(header,head_length,"table_type",10,"Columns",8,NullS);
else
{
print_header(header,head_length,"table_type",10,"Columns",8,
"Total Rows",10,NullS);
}
}
else
{
if (!opt_verbose)
print_header(header,head_length,NullS);
else if (opt_verbose == 1)
print_header(header,head_length,"Columns",8,NullS);
else
print_header(header,head_length,"Columns",8, "Total Rows",10,NullS);
}
while ((row = mysql_fetch_row(result)))
{
counter++;
if (opt_verbose > 0)
{
if (!(mysql_select_db(mysql,db)))
{
MYSQL_RES *rresult = mysql_list_fields(mysql,row[0],NULL);
ulong rowcount=0L;
if (!rresult)
{
strmov(fields,"N/A");
strmov(rows,"N/A");
}
else
{
sprintf(fields,"%8u",(uint) mysql_num_fields(rresult));
mysql_free_result(rresult);
if (opt_verbose > 1)
{
/* Print the count of rows for each table */
sprintf(query,"SELECT COUNT(*) FROM `%s`",row[0]);
if (!(mysql_query(mysql,query)))
{
if ((rresult = mysql_store_result(mysql)))
{
rrow = mysql_fetch_row(rresult);
rowcount += (unsigned long) strtoull(rrow[0], (char**) 0, 10);
mysql_free_result(rresult);
}
sprintf(rows,"%10lu",rowcount);
}
else
sprintf(rows,"%10d",0);
}
}
}
else
{
strmov(fields,"N/A");
strmov(rows,"N/A");
}
}
if (opt_table_type)
{
if (!opt_verbose)
print_row(row[0],head_length,row[1],10,NullS);
else if (opt_verbose == 1)
print_row(row[0],head_length,row[1],10,fields,8,NullS);
else
print_row(row[0],head_length,row[1],10,fields,8,rows,10,NullS);
}
else
{
if (!opt_verbose)
print_row(row[0],head_length,NullS);
else if (opt_verbose == 1)
print_row(row[0],head_length, fields,8, NullS);
else
print_row(row[0],head_length, fields,8, rows,10, NullS);
}
}
print_trailer(head_length,
(opt_table_type ? 10 : opt_verbose > 0 ? 8 : 0),
(opt_table_type ? (opt_verbose > 0 ? 8 : 0)
: (opt_verbose > 1 ? 10 :0)),
!opt_table_type ? 0 : opt_verbose > 1 ? 10 :0,
0);
if (counter && opt_verbose)
printf("%u row%s in set.\n\n",counter,(counter > 1) ? "s" : "");
mysql_free_result(result);
return 0;
}
static int
list_table_status(MYSQL *mysql,const char *db,const char *wild)
{
char query[1024],*end;
MYSQL_RES *result;
MYSQL_ROW row;
end=strxmov(query,"show table status from `",db,"`",NullS);
if (wild && wild[0])
strxmov(end," like '",wild,"'",NullS);
if (mysql_query(mysql,query) || !(result=mysql_store_result(mysql)))
{
fprintf(stderr,"%s: Cannot get status for db: %s, table: %s: %s\n",
my_progname,db,wild ? wild : "",mysql_error(mysql));
if (mysql_errno(mysql) == ER_PARSE_ERROR)
fprintf(stderr,"This error probably means that your MySQL server doesn't support the\n\'show table status' command.\n");
return 1;
}
printf("Database: %s",db);
if (wild)
printf(" Wildcard: %s",wild);
putchar('\n');
print_res_header(result);
while ((row=mysql_fetch_row(result)))
print_res_row(result,row);
print_res_top(result);
mysql_free_result(result);
return 0;
}
/*
list fields uses field interface as an example of how to parse
a MYSQL FIELD
*/
static int
list_fields(MYSQL *mysql,const char *db,const char *table,
const char *wild)
{
char query[1024],*end;
MYSQL_RES *result;
MYSQL_ROW row;
ulong rows;
LINT_INIT(rows);
if (mysql_select_db(mysql,db))
{
fprintf(stderr,"%s: Cannot connect to db: %s: %s\n",my_progname,db,
mysql_error(mysql));
return 1;
}
if (opt_count)
{
sprintf(query,"select count(*) from `%s`", table);
if (mysql_query(mysql,query) || !(result=mysql_store_result(mysql)))
{
fprintf(stderr,"%s: Cannot get record count for db: %s, table: %s: %s\n",
my_progname,db,table,mysql_error(mysql));
return 1;
}
row= mysql_fetch_row(result);
rows= (ulong) strtoull(row[0], (char**) 0, 10);
mysql_free_result(result);
}
end=strmov(strmov(strmov(query,"show /*!32332 FULL */ columns from `"),table),"`");
if (wild && wild[0])
strxmov(end," like '",wild,"'",NullS);
if (mysql_query(mysql,query) || !(result=mysql_store_result(mysql)))
{
fprintf(stderr,"%s: Cannot list columns in db: %s, table: %s: %s\n",
my_progname,db,table,mysql_error(mysql));
return 1;
}
printf("Database: %s Table: %s", db, table);
if (opt_count)
printf(" Rows: %lu", rows);
if (wild && wild[0])
printf(" Wildcard: %s",wild);
putchar('\n');
print_res_header(result);
while ((row=mysql_fetch_row(result)))
print_res_row(result,row);
print_res_top(result);
if (opt_show_keys)
{
end=strmov(strmov(strmov(query,"show keys from `"),table),"`");
if (mysql_query(mysql,query) || !(result=mysql_store_result(mysql)))
{
fprintf(stderr,"%s: Cannot list keys in db: %s, table: %s: %s\n",
my_progname,db,table,mysql_error(mysql));
return 1;
}
if (mysql_num_rows(result))
{
print_res_header(result);
while ((row=mysql_fetch_row(result)))
print_res_row(result,row);
print_res_top(result);
}
else
puts("Table has no keys");
}
mysql_free_result(result);
return 0;
}
/*****************************************************************************
General functions to print a nice ascii-table from data
*****************************************************************************/
static void
print_header(const char *header,uint head_length,...)
{
va_list args;
uint length,i,str_length,pre_space;
const char *field;
va_start(args,head_length);
putchar('+');
field=header; length=head_length;
for (;;)
{
for (i=0 ; i < length+2 ; i++)
putchar('-');
putchar('+');
if (!(field=va_arg(args,char *)))
break;
length=va_arg(args,uint);
}
va_end(args);
putchar('\n');
va_start(args,head_length);
field=header; length=head_length;
putchar('|');
for (;;)
{
str_length=(uint) strlen(field);
if (str_length > length)
str_length=length+1;
pre_space=(uint) (((int) length-(int) str_length)/2)+1;
for (i=0 ; i < pre_space ; i++)
putchar(' ');
for (i = 0 ; i < str_length ; i++)
putchar(field[i]);
length=length+2-str_length-pre_space;
for (i=0 ; i < length ; i++)
putchar(' ');
putchar('|');
if (!(field=va_arg(args,char *)))
break;
length=va_arg(args,uint);
}
va_end(args);
putchar('\n');
va_start(args,head_length);
putchar('+');
field=header; length=head_length;
for (;;)
{
for (i=0 ; i < length+2 ; i++)
putchar('-');
putchar('+');
if (!(field=va_arg(args,char *)))
break;
length=va_arg(args,uint);
}
va_end(args);
putchar('\n');
}
static void
print_row(const char *header,uint head_length,...)
{
va_list args;
const char *field;
uint i,length,field_length;
va_start(args,head_length);
field=header; length=head_length;
for (;;)
{
putchar('|');
putchar(' ');
fputs(field,stdout);
field_length=(uint) strlen(field);
for (i=field_length ; i <= length ; i++)
putchar(' ');
if (!(field=va_arg(args,char *)))
break;
length=va_arg(args,uint);
}
va_end(args);
putchar('|');
putchar('\n');
}
static void
print_trailer(uint head_length,...)
{
va_list args;
uint length,i;
va_start(args,head_length);
length=head_length;
putchar('+');
for (;;)
{
for (i=0 ; i < length+2 ; i++)
putchar('-');
putchar('+');
if (!(length=va_arg(args,uint)))
break;
}
va_end(args);
putchar('\n');
}
static void print_res_header(MYSQL_RES *result)
{
MYSQL_FIELD *field;
print_res_top(result);
mysql_field_seek(result,0);
putchar('|');
while ((field = mysql_fetch_field(result)))
{
printf(" %-*s|",(int) field->max_length+1,field->name);
}
putchar('\n');
print_res_top(result);
}
static void print_res_top(MYSQL_RES *result)
{
uint i,length;
MYSQL_FIELD *field;
putchar('+');
mysql_field_seek(result,0);
while((field = mysql_fetch_field(result)))
{
if ((length=(uint) strlen(field->name)) > field->max_length)
field->max_length=length;
else
length=field->max_length;
for (i=length+2 ; i--> 0 ; )
putchar('-');
putchar('+');
}
putchar('\n');
}
static void print_res_row(MYSQL_RES *result,MYSQL_ROW cur)
{
uint i,length;
MYSQL_FIELD *field;
putchar('|');
mysql_field_seek(result,0);
for (i=0 ; i < mysql_num_fields(result); i++)
{
field = mysql_fetch_field(result);
length=field->max_length;
printf(" %-*s|",length+1,cur[i] ? (char*) cur[i] : "");
}
putchar('\n');
}
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