/
command.c
1948 lines (1676 loc) · 41.4 KB
/
command.c
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/*
* psql - the PostgreSQL interactive terminal
*
* Copyright 2000-2002 by PostgreSQL Global Development Group
*
* $Header: /cvsroot/pgsql/src/bin/psql/command.c,v 1.84.2.1 2003/01/24 05:23:55 tgl Exp $
*/
#include "postgres_fe.h"
#include "command.h"
#include <errno.h>
#include <assert.h>
#include <ctype.h>
#ifdef HAVE_PWD_H
#include <pwd.h>
#endif
#ifndef WIN32
#include <sys/types.h> /* for umask() */
#include <sys/stat.h> /* for stat() */
#include <fcntl.h> /* open() flags */
#include <unistd.h> /* for geteuid(), getpid(), stat() */
#else
#include <win32.h>
#include <io.h>
#include <fcntl.h>
#include <direct.h>
#endif
#include "libpq-fe.h"
#include "pqexpbuffer.h"
#include "common.h"
#include "copy.h"
#include "describe.h"
#include "help.h"
#include "input.h"
#include "large_obj.h"
#include "mainloop.h"
#include "print.h"
#include "settings.h"
#include "variables.h"
#include "mb/pg_wchar.h"
/* functions for use in this file */
static backslashResult exec_command(const char *cmd,
const char *options_string,
const char **continue_parse,
PQExpBuffer query_buf,
volatile int *paren_level);
/* different ways for scan_option to handle parameter words */
enum option_type
{
OT_NORMAL, /* normal case */
OT_SQLID, /* treat as SQL identifier */
OT_SQLIDHACK, /* SQL identifier, but don't downcase */
OT_FILEPIPE /* it's a filename or pipe */
};
static char *scan_option(char **string, enum option_type type,
char *quote, bool semicolon);
static char *unescape(const unsigned char *source, size_t len);
static bool do_edit(const char *filename_arg, PQExpBuffer query_buf);
static bool do_connect(const char *new_dbname, const char *new_user);
static bool do_shell(const char *command);
/*----------
* HandleSlashCmds:
*
* Handles all the different commands that start with '\',
* ordinarily called by MainLoop().
*
* 'line' is the current input line, which should not start with a '\'
* but with the actual command name
* (that is taken care of by MainLoop)
*
* 'query_buf' contains the query-so-far, which may be modified by
* execution of the backslash command (for example, \r clears it)
* query_buf can be NULL if there is no query so far.
*
* Returns a status code indicating what action is desired, see command.h.
*----------
*/
backslashResult
HandleSlashCmds(const char *line,
PQExpBuffer query_buf,
const char **end_of_cmd,
volatile int *paren_level)
{
backslashResult status = CMD_SKIP_LINE;
char *my_line;
char *options_string = NULL;
size_t blank_loc;
const char *continue_parse = NULL; /* tell the mainloop where the
* backslash command ended */
#ifdef USE_ASSERT_CHECKING
assert(line);
#endif
my_line = xstrdup(line);
/*
* Find the first whitespace. line[blank_loc] will now be the
* whitespace character or the \0 at the end
*
* Also look for a backslash, so stuff like \p\g works.
*/
blank_loc = strcspn(my_line, " \t\n\r\\");
if (my_line[blank_loc] == '\\')
{
continue_parse = &my_line[blank_loc];
my_line[blank_loc] = '\0';
/* If it's a double backslash, we skip it. */
if (my_line[blank_loc + 1] == '\\')
continue_parse += 2;
}
/* do we have an option string? */
else if (my_line[blank_loc] != '\0')
{
options_string = &my_line[blank_loc + 1];
my_line[blank_loc] = '\0';
}
status = exec_command(my_line, options_string, &continue_parse, query_buf, paren_level);
if (status == CMD_UNKNOWN)
{
/*
* If the command was not recognized, try to parse it as a
* one-letter command with immediately following argument (a
* still-supported, but no longer encouraged, syntax).
*/
char new_cmd[2];
new_cmd[0] = my_line[0];
new_cmd[1] = '\0';
/* use line for options, because my_line was clobbered above */
status = exec_command(new_cmd, line + 1, &continue_parse, query_buf, paren_level);
/*
* continue_parse must be relative to my_line for calculation
* below
*/
continue_parse += my_line - line;
#if 0 /* turned out to be too annoying */
if (status != CMD_UNKNOWN && isalpha((unsigned char) new_cmd[0]))
psql_error("Warning: This syntax is deprecated.\n");
#endif
}
if (status == CMD_UNKNOWN)
{
if (pset.cur_cmd_interactive)
fprintf(stderr, gettext("Invalid command \\%s. Try \\? for help.\n"), my_line);
else
psql_error("invalid command \\%s\n", my_line);
status = CMD_ERROR;
}
if (continue_parse && *continue_parse && *(continue_parse + 1) == '\\')
continue_parse += 2;
if (end_of_cmd)
{
if (continue_parse)
*end_of_cmd = line + (continue_parse - my_line);
else
*end_of_cmd = line + strlen(line);
}
free(my_line);
return status;
}
static backslashResult
exec_command(const char *cmd,
const char *options_string,
const char **continue_parse,
PQExpBuffer query_buf,
volatile int *paren_level)
{
bool success = true; /* indicate here if the command ran ok or
* failed */
bool quiet = QUIET();
backslashResult status = CMD_SKIP_LINE;
char *string,
*string_cpy,
*val;
/*
* The 'string' variable will be overwritten to point to the next
* token, hence we need an extra pointer so we can free this at the
* end.
*/
if (options_string)
string = string_cpy = xstrdup(options_string);
else
string = string_cpy = NULL;
/*
* \a -- toggle field alignment This makes little sense but we keep it
* around.
*/
if (strcmp(cmd, "a") == 0)
{
if (pset.popt.topt.format != PRINT_ALIGNED)
success = do_pset("format", "aligned", &pset.popt, quiet);
else
success = do_pset("format", "unaligned", &pset.popt, quiet);
}
/* \C -- override table title (formerly change HTML caption) */
else if (strcmp(cmd, "C") == 0)
{
char *opt = scan_option(&string, OT_NORMAL, NULL, true);
success = do_pset("title", opt, &pset.popt, quiet);
free(opt);
}
/*----------
* \c or \connect -- connect to new database or as different user
*
* \c foo bar connect to db "foo" as user "bar"
* \c foo [-] connect to db "foo" as current user
* \c - bar connect to current db as user "bar"
* \c connect to default db as default user
*----------
*/
else if (strcmp(cmd, "c") == 0 || strcmp(cmd, "connect") == 0)
{
char *opt1,
*opt2;
char opt1q,
opt2q;
/*
* Ideally we should treat the arguments as SQL identifiers. But
* for backwards compatibility with 7.2 and older pg_dump files,
* we have to take unquoted arguments verbatim (don't downcase
* them). For now, double-quoted arguments may be stripped of
* double quotes (as if SQL identifiers). By 7.4 or so, pg_dump
* files can be expected to double-quote all mixed-case \connect
* arguments, and then we can get rid of OT_SQLIDHACK.
*/
opt1 = scan_option(&string, OT_SQLIDHACK, &opt1q, true);
opt2 = scan_option(&string, OT_SQLIDHACK, &opt2q, true);
if (opt2)
/* gave username */
success = do_connect(!opt1q && (strcmp(opt1, "-") == 0 || strcmp(opt1, "") == 0) ? "" : opt1,
!opt2q && (strcmp(opt2, "-") == 0 || strcmp(opt2, "") == 0) ? "" : opt2);
else if (opt1)
/* gave database name */
success = do_connect(!opt1q && (strcmp(opt1, "-") == 0 || strcmp(opt1, "") == 0) ? "" : opt1, "");
else
/* connect to default db as default user */
success = do_connect(NULL, NULL);
free(opt1);
free(opt2);
}
/* \cd */
else if (strcmp(cmd, "cd") == 0)
{
char *opt = scan_option(&string, OT_NORMAL, NULL, true);
char *dir;
if (opt)
dir = opt;
else
{
#ifndef WIN32
struct passwd *pw;
pw = getpwuid(geteuid());
if (!pw)
{
psql_error("could not get home directory: %s\n", strerror(errno));
exit(EXIT_FAILURE);
}
dir = pw->pw_dir;
#else /* WIN32 */
/*
* On Windows, 'cd' without arguments prints the current
* directory, so if someone wants to code this here instead...
*/
dir = "/";
#endif /* WIN32 */
}
if (chdir(dir) == -1)
{
psql_error("\\%s: could not change directory to '%s': %s\n",
cmd, dir, strerror(errno));
success = false;
}
if (opt)
free(opt);
}
/* \copy */
else if (strcasecmp(cmd, "copy") == 0)
{
success = do_copy(options_string);
if (options_string)
string += strlen(string);
}
/* \copyright */
else if (strcmp(cmd, "copyright") == 0)
print_copyright();
/* \d* commands */
else if (cmd[0] == 'd')
{
char *pattern;
bool show_verbose;
/* We don't do SQLID reduction on the pattern yet */
pattern = scan_option(&string, OT_NORMAL, NULL, true);
show_verbose = strchr(cmd, '+') ? true : false;
switch (cmd[1])
{
case '\0':
case '+':
if (pattern)
success = describeTableDetails(pattern, show_verbose);
else
/* standard listing of interesting things */
success = listTables("tvs", NULL, show_verbose);
break;
case 'a':
success = describeAggregates(pattern, show_verbose);
break;
case 'd':
success = objectDescription(pattern);
break;
case 'f':
success = describeFunctions(pattern, show_verbose);
break;
case 'l':
success = do_lo_list();
break;
case 'o':
success = describeOperators(pattern);
break;
case 'p':
success = permissionsList(pattern);
break;
case 'T':
success = describeTypes(pattern, show_verbose);
break;
case 't':
case 'v':
case 'i':
case 's':
case 'S':
success = listTables(&cmd[1], pattern, show_verbose);
break;
case 'u':
success = describeUsers(pattern);
break;
case 'D':
success = listDomains(pattern);
break;
default:
status = CMD_UNKNOWN;
}
if (pattern)
free(pattern);
}
/*
* \e or \edit -- edit the current query buffer (or a file and make it
* the query buffer
*/
else if (strcmp(cmd, "e") == 0 || strcmp(cmd, "edit") == 0)
{
char *fname;
if (!query_buf)
{
psql_error("no query buffer\n");
status = CMD_ERROR;
}
else
{
fname = scan_option(&string, OT_NORMAL, NULL, true);
status = do_edit(fname, query_buf) ? CMD_NEWEDIT : CMD_ERROR;
free(fname);
}
}
/* \echo and \qecho */
else if (strcmp(cmd, "echo") == 0 || strcmp(cmd, "qecho") == 0)
{
char *value;
char quoted;
bool no_newline = false;
bool first = true;
FILE *fout;
if (strcmp(cmd, "qecho") == 0)
fout = pset.queryFout;
else
fout = stdout;
while ((value = scan_option(&string, OT_NORMAL, "ed, false)))
{
if (!quoted && strcmp(value, "-n") == 0)
no_newline = true;
else
{
if (first)
first = false;
else
fputc(' ', fout);
fputs(value, fout);
}
free(value);
}
if (!no_newline)
fputs("\n", fout);
}
/* \encoding -- set/show client side encoding */
else if (strcmp(cmd, "encoding") == 0)
{
char *encoding = scan_option(&string, OT_NORMAL, NULL, false);
if (!encoding)
/* show encoding */
puts(pg_encoding_to_char(pset.encoding));
else
{
/* set encoding */
if (PQsetClientEncoding(pset.db, encoding) == -1)
psql_error("%s: invalid encoding name or conversion procedure not found\n", encoding);
else
{
/* save encoding info into psql internal data */
pset.encoding = PQclientEncoding(pset.db);
SetVariable(pset.vars, "ENCODING", pg_encoding_to_char(pset.encoding));
}
free(encoding);
}
}
/* \f -- change field separator */
else if (strcmp(cmd, "f") == 0)
{
char *fname = scan_option(&string, OT_NORMAL, NULL, false);
success = do_pset("fieldsep", fname, &pset.popt, quiet);
free(fname);
}
/* \g means send query */
else if (strcmp(cmd, "g") == 0)
{
char *fname = scan_option(&string, OT_FILEPIPE, NULL, false);
if (!fname)
pset.gfname = NULL;
else
pset.gfname = xstrdup(fname);
free(fname);
status = CMD_SEND;
}
/* help */
else if (strcmp(cmd, "h") == 0 || strcmp(cmd, "help") == 0)
{
helpSQL(options_string ? &options_string[strspn(options_string, " \t\n\r")] : NULL,
pset.popt.topt.pager);
/* set pointer to end of line */
if (string)
string += strlen(string);
}
/* HTML mode */
else if (strcmp(cmd, "H") == 0 || strcmp(cmd, "html") == 0)
{
if (pset.popt.topt.format != PRINT_HTML)
success = do_pset("format", "html", &pset.popt, quiet);
else
success = do_pset("format", "aligned", &pset.popt, quiet);
}
/* \i is include file */
else if (strcmp(cmd, "i") == 0 || strcmp(cmd, "include") == 0)
{
char *fname = scan_option(&string, OT_NORMAL, NULL, true);
if (!fname)
{
psql_error("\\%s: missing required argument\n", cmd);
success = false;
}
else
{
success = (process_file(fname) == EXIT_SUCCESS);
free(fname);
}
}
/* \l is list databases */
else if (strcmp(cmd, "l") == 0 || strcmp(cmd, "list") == 0)
success = listAllDbs(false);
else if (strcmp(cmd, "l+") == 0 || strcmp(cmd, "list+") == 0)
success = listAllDbs(true);
/*
* large object things
*/
else if (strncmp(cmd, "lo_", 3) == 0)
{
char *opt1,
*opt2;
opt1 = scan_option(&string, OT_NORMAL, NULL, true);
opt2 = scan_option(&string, OT_NORMAL, NULL, true);
if (strcmp(cmd + 3, "export") == 0)
{
if (!opt2)
{
psql_error("\\%s: missing required argument\n", cmd);
success = false;
}
else
success = do_lo_export(opt1, opt2);
}
else if (strcmp(cmd + 3, "import") == 0)
{
if (!opt1)
{
psql_error("\\%s: missing required argument\n", cmd);
success = false;
}
else
success = do_lo_import(opt1, opt2);
}
else if (strcmp(cmd + 3, "list") == 0)
success = do_lo_list();
else if (strcmp(cmd + 3, "unlink") == 0)
{
if (!opt1)
{
psql_error("\\%s: missing required argument\n", cmd);
success = false;
}
else
success = do_lo_unlink(opt1);
}
else
status = CMD_UNKNOWN;
free(opt1);
free(opt2);
}
/* \o -- set query output */
else if (strcmp(cmd, "o") == 0 || strcmp(cmd, "out") == 0)
{
char *fname = scan_option(&string, OT_FILEPIPE, NULL, true);
success = setQFout(fname);
free(fname);
}
/* \p prints the current query buffer */
else if (strcmp(cmd, "p") == 0 || strcmp(cmd, "print") == 0)
{
if (query_buf && query_buf->len > 0)
puts(query_buf->data);
else if (!quiet)
puts(gettext("Query buffer is empty."));
fflush(stdout);
}
/* \pset -- set printing parameters */
else if (strcmp(cmd, "pset") == 0)
{
char *opt0 = scan_option(&string, OT_NORMAL, NULL, false);
char *opt1 = scan_option(&string, OT_NORMAL, NULL, false);
if (!opt0)
{
psql_error("\\%s: missing required argument\n", cmd);
success = false;
}
else
success = do_pset(opt0, opt1, &pset.popt, quiet);
free(opt0);
free(opt1);
}
/* \q or \quit */
else if (strcmp(cmd, "q") == 0 || strcmp(cmd, "quit") == 0)
status = CMD_TERMINATE;
/* reset(clear) the buffer */
else if (strcmp(cmd, "r") == 0 || strcmp(cmd, "reset") == 0)
{
resetPQExpBuffer(query_buf);
if (paren_level)
*paren_level = 0;
if (!quiet)
puts(gettext("Query buffer reset (cleared)."));
}
/* \s save history in a file or show it on the screen */
else if (strcmp(cmd, "s") == 0)
{
char *fname = scan_option(&string, OT_NORMAL, NULL, true);
success = saveHistory(fname ? fname : "/dev/tty");
if (success && !quiet && fname)
printf(gettext("Wrote history to %s.\n"), fname);
free(fname);
}
/* \set -- generalized set variable/option command */
else if (strcmp(cmd, "set") == 0)
{
char *opt0 = scan_option(&string, OT_NORMAL, NULL, false);
if (!opt0)
{
/* list all variables */
/*
* XXX This is in utter violation of the GetVariable
* abstraction, but I have not bothered to do it better.
*/
struct _variable *ptr;
for (ptr = pset.vars; ptr->next; ptr = ptr->next)
fprintf(stdout, "%s = '%s'\n", ptr->next->name, ptr->next->value);
success = true;
}
else
{
/*
* Set variable to the concatenation of the arguments.
*/
char *newval = NULL;
char *opt;
opt = scan_option(&string, OT_NORMAL, NULL, false);
newval = xstrdup(opt ? opt : "");
free(opt);
while ((opt = scan_option(&string, OT_NORMAL, NULL, false)))
{
newval = realloc(newval, strlen(newval) + strlen(opt) + 1);
if (!newval)
{
psql_error("out of memory\n");
exit(EXIT_FAILURE);
}
strcat(newval, opt);
free(opt);
}
if (!SetVariable(pset.vars, opt0, newval))
{
psql_error("\\%s: error\n", cmd);
success = false;
}
free(newval);
}
free(opt0);
}
/* \t -- turn off headers and row count */
else if (strcmp(cmd, "t") == 0)
success = do_pset("tuples_only", NULL, &pset.popt, quiet);
/* \T -- define html <table ...> attributes */
else if (strcmp(cmd, "T") == 0)
{
char *value = scan_option(&string, OT_NORMAL, NULL, false);
success = do_pset("tableattr", value, &pset.popt, quiet);
free(value);
}
/* \timing -- toggle timing of queries */
else if (strcmp(cmd, "timing") == 0)
{
pset.timing = !pset.timing;
if (!quiet)
{
if (pset.timing)
puts(gettext(("Timing is on.")));
else
{
puts(gettext(("Timing is off.")));
}
}
}
/* \unset */
else if (strcmp(cmd, "unset") == 0)
{
char *opt = scan_option(&string, OT_NORMAL, NULL, false);
if (!opt)
{
psql_error("\\%s: missing required argument\n", cmd);
success = false;
}
else if (!SetVariable(pset.vars, opt, NULL))
{
psql_error("\\%s: error\n", cmd);
success = false;
}
free(opt);
}
/* \w -- write query buffer to file */
else if (strcmp(cmd, "w") == 0 || strcmp(cmd, "write") == 0)
{
FILE *fd = NULL;
bool is_pipe = false;
char *fname = NULL;
if (!query_buf)
{
psql_error("no query buffer\n");
status = CMD_ERROR;
}
else
{
fname = scan_option(&string, OT_FILEPIPE, NULL, true);
if (!fname)
{
psql_error("\\%s: missing required argument\n", cmd);
success = false;
}
else
{
if (fname[0] == '|')
{
is_pipe = true;
fd = popen(&fname[1], "w");
}
else
fd = fopen(fname, "w");
if (!fd)
{
psql_error("%s: %s\n", fname, strerror(errno));
success = false;
}
}
}
if (fd)
{
int result;
if (query_buf && query_buf->len > 0)
fprintf(fd, "%s\n", query_buf->data);
if (is_pipe)
result = pclose(fd);
else
result = fclose(fd);
if (result == EOF)
{
psql_error("%s: %s\n", fname, strerror(errno));
success = false;
}
}
free(fname);
}
/* \x -- toggle expanded table representation */
else if (strcmp(cmd, "x") == 0)
success = do_pset("expanded", NULL, &pset.popt, quiet);
/* \z -- list table rights (equivalent to \dp) */
else if (strcmp(cmd, "z") == 0)
{
char *pattern = scan_option(&string, OT_NORMAL, NULL, true);
success = permissionsList(pattern);
if (pattern)
free(pattern);
}
/* \! -- shell escape */
else if (strcmp(cmd, "!") == 0)
{
success = do_shell(options_string);
/* wind pointer to end of line */
if (string)
string += strlen(string);
}
/* \? -- slash command help */
else if (strcmp(cmd, "?") == 0)
slashUsage(pset.popt.topt.pager);
#if 0
/*
* These commands don't do anything. I just use them to test the
* parser.
*/
else if (strcmp(cmd, "void") == 0 || strcmp(cmd, "#") == 0)
{
int i = 0;
char *value;
fprintf(stderr, "+ optstr = |%s|\n", options_string);
while ((value = scan_option(&string, OT_NORMAL, NULL, true)))
{
fprintf(stderr, "+ opt(%d) = |%s|\n", i++, value);
free(value);
}
}
#endif
else
status = CMD_UNKNOWN;
if (!success)
status = CMD_ERROR;
/* eat the rest of the options string */
while ((val = scan_option(&string, OT_NORMAL, NULL, false)))
{
if (status != CMD_UNKNOWN)
psql_error("\\%s: extra argument '%s' ignored\n", cmd, val);
}
if (options_string && continue_parse)
*continue_parse = options_string + (string - string_cpy);
free(string_cpy);
return status;
}
/*
* scan_option()
*
* *string points to possible option string on entry; on exit, it's updated
* to point past the option string (if any).
*
* type tells what processing, if any, to perform on the option string;
* for example, if it's a SQL identifier, we want to downcase any unquoted
* letters.
*
* if quote is not NULL, *quote is set to 0 if no quoting was found, else
* the quote symbol.
*
* if semicolon is true, trailing semicolon(s) that would otherwise be taken
* as part of the option string will be stripped.
*
* Return value is NULL if no option found, else a malloc'd copy of the
* processed option value.
*/
static char *
scan_option(char **string, enum option_type type, char *quote, bool semicolon)
{
unsigned int pos;
char *options_string;
char *return_val;
if (quote)
*quote = 0;
if (!string || !(*string))
return NULL;
options_string = *string;
/* skip leading whitespace */
pos = strspn(options_string, " \t\n\r");
switch (options_string[pos])
{
/*
* End of line: no option present
*/
case '\0':
*string = &options_string[pos];
return NULL;
/*
* Next command: treat like end of line
*
* XXX this means we can't conveniently accept options that start
* with a backslash; therefore, option processing that
* encourages use of backslashes is rather broken.
*/
case '\\':
*string = &options_string[pos];
return NULL;
/*
* A single quote has a psql internal meaning, such as for
* delimiting file names, and it also allows for such escape
* sequences as \t.
*/
case '\'':
{
unsigned int jj;
unsigned short int bslash_count = 0;
for (jj = pos + 1; options_string[jj]; jj += PQmblen(&options_string[jj], pset.encoding))
{
if (options_string[jj] == '\'' && bslash_count % 2 == 0)
break;
if (options_string[jj] == '\\')
bslash_count++;
else
bslash_count = 0;
}
if (options_string[jj] == 0)
{
psql_error("parse error at the end of line\n");
*string = &options_string[jj];
return NULL;
}
return_val = unescape(&options_string[pos + 1], jj - pos - 1);
*string = &options_string[jj + 1];
if (quote)
*quote = '\'';
return return_val;
}
/*
* Backticks are for command substitution, like in shells
*/
case '`':
{
bool error = false;
FILE *fd;
char *file;
PQExpBufferData output;
char buf[512];
size_t result,
len;
len = strcspn(options_string + pos + 1, "`");
if (options_string[pos + 1 + len] == 0)
{
psql_error("parse error at the end of line\n");
*string = &options_string[pos + 1 + len];
return NULL;
}
options_string[pos + 1 + len] = '\0';
file = options_string + pos + 1;