/*
* Subroutine to actually try to execute a backslash command.
*/
static backslashResult
exec_command(const char *cmd,
PsqlScanState scan_state,
PQExpBuffer query_buf)
{
bool success = true; /* indicate here if the command ran ok or
* failed */
backslashResult status = PSQL_CMD_SKIP_LINE;
/*
* \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, pset.quiet);
else
success = do_pset("format", "unaligned", &pset.popt, pset.quiet);
}
/* \C -- override table title (formerly change HTML caption) */
else if (strcmp(cmd, "C") == 0)
{
char *opt = psql_scan_slash_option(scan_state,
OT_NORMAL, NULL, true);
success = do_pset("title", opt, &pset.popt, pset.quiet);
free(opt);
}
/*
* \c or \connect -- connect to database using the specified parameters.
*
* \c dbname user host port
*
* If any of these parameters are omitted or specified as '-', the current
* value of the parameter will be used instead. If the parameter has no
* current value, the default value for that parameter will be used. Some
* examples:
*
* \c - - hst Connect to current database on current port of host
* "hst" as current user. \c - usr - prt Connect to current database on
* "prt" port of current host as user "usr". \c dbs Connect to
* "dbs" database on current port of current host as current user.
*/
else if (strcmp(cmd, "c") == 0 || strcmp(cmd, "connect") == 0)
{
char *opt1,
*opt2,
*opt3,
*opt4;
opt1 = read_connect_arg(scan_state);
opt2 = read_connect_arg(scan_state);
opt3 = read_connect_arg(scan_state);
opt4 = read_connect_arg(scan_state);
success = do_connect(opt1, opt2, opt3, opt4);
free(opt1);
free(opt2);
free(opt3);
free(opt4);
}
/* \cd */
else if (strcmp(cmd, "cd") == 0)
{
char *opt = psql_scan_slash_option(scan_state,
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 (pset.dirname)
free(pset.dirname);
pset.dirname = pg_strdup(dir);
canonicalize_path(pset.dirname);
if (opt)
free(opt);
}
/* \conninfo -- display information about the current connection */
else if (strcmp(cmd, "conninfo") == 0)
{
char *db = PQdb(pset.db);
char *host = PQhost(pset.db);
if (db == NULL)
printf(_("You are not connected.\n"));
else
{
if (host == NULL)
host = DEFAULT_PGSOCKET_DIR;
/* If the host is an absolute path, the connection is via socket */
if (is_absolute_path(host))
printf(_("You are connected to database \"%s\" as user \"%s\" via socket in \"%s\" at port \"%s\".\n"),
db, PQuser(pset.db), host, PQport(pset.db));
else
printf(_("You are connected to database \"%s\" as user \"%s\" on host \"%s\" at port \"%s\".\n"),
db, PQuser(pset.db), host, PQport(pset.db));
}
}
/* \copy */
else if (pg_strcasecmp(cmd, "copy") == 0)
{
/* Default fetch-it-all-and-print mode */
instr_time before,
after;
char *opt = psql_scan_slash_option(scan_state,
OT_WHOLE_LINE, NULL, false);
if (pset.timing)
INSTR_TIME_SET_CURRENT(before);
success = do_copy(opt);
if (pset.timing && success)
{
INSTR_TIME_SET_CURRENT(after);
INSTR_TIME_SUBTRACT(after, before);
printf(_("Time: %.3f ms\n"), INSTR_TIME_GET_MILLISEC(after));
}
free(opt);
}
/* \copyright */
else if (strcmp(cmd, "copyright") == 0)
print_copyright();
/* \d* commands */
else if (cmd[0] == 'd')
{
char *pattern;
bool show_verbose,
show_system;
/* We don't do SQLID reduction on the pattern yet */
pattern = psql_scan_slash_option(scan_state,
OT_NORMAL, NULL, true);
show_verbose = strchr(cmd, '+') ? true : false;
show_system = strchr(cmd, 'S') ? true : false;
switch (cmd[1])
{
case '\0':
case '+':
case 'S': /* GPDB: This is a change from old behavior: We used to show just system tables */
if (pattern)
success = describeTableDetails(pattern, show_verbose, show_system);
else
/* standard listing of interesting things */
success = listTables("tvsxr", NULL, show_verbose, show_system);
break;
case 'a':
success = describeAggregates(pattern, show_verbose, show_system);
break;
case 'b':
success = describeTablespaces(pattern, show_verbose);
break;
case 'c':
success = listConversions(pattern, show_system);
break;
case 'C':
success = listCasts(pattern);
break;
case 'd':
if (strncmp(cmd, "ddp", 3) == 0)
success = listDefaultACLs(pattern);
else
success = objectDescription(pattern, show_system);
break;
case 'D':
success = listDomains(pattern, show_system);
break;
case 'f': /* function subsystem */
switch (cmd[2])
{
case '\0':
case '+':
case 'S':
case 'a':
case 'n':
case 't':
case 'w':
success = describeFunctions(&cmd[2], pattern, show_verbose, show_system);
break;
default:
status = PSQL_CMD_UNKNOWN;
break;
}
break;
case 'g':
/* no longer distinct from \du */
success = describeRoles(pattern, show_verbose);
break;
case 'l':
success = do_lo_list();
break;
case 'n':
success = listSchemas(pattern, show_verbose);
break;
case 'o':
success = describeOperators(pattern, show_system);
break;
case 'p':
success = permissionsList(pattern);
break;
case 'T':
success = describeTypes(pattern, show_verbose, show_system);
break;
case 't':
case 'v':
case 'i':
case 's':
case 'E': /* PostgreSQL use dx for extension, change to dE for foreign table */
/* case 'S': // GPDB: We used to show just system tables for this */
case 'P': /* GPDB: Parent-only tables, no children */
success = listTables(&cmd[1], pattern, show_verbose, show_system);
break;
case 'r':
if (cmd[2] == 'd' && cmd[3] == 's')
{
char *pattern2 = NULL;
if (pattern)
pattern2 = psql_scan_slash_option(scan_state,
OT_NORMAL, NULL, true);
success = listDbRoleSettings(pattern, pattern2);
}
else
//success = PSQL_CMD_UNKNOWN;
/* GPDB uses \dr for foreign tables ? */
success = listTables(&cmd[1], pattern, show_verbose, show_system);
break;
case 'u':
success = describeRoles(pattern, show_verbose);
break;
case 'F': /* text search subsystem */
switch (cmd[2])
{
case '\0':
case '+':
success = listTSConfigs(pattern, show_verbose);
break;
case 'p':
success = listTSParsers(pattern, show_verbose);
break;
case 'd':
success = listTSDictionaries(pattern, show_verbose);
break;
case 't':
success = listTSTemplates(pattern, show_verbose);
break;
default:
status = PSQL_CMD_UNKNOWN;
break;
}
break;
case 'x': /* Extensions */
if (show_verbose)
success = listExtensionContents(pattern);
else
success = listExtensions(pattern);
break;
default:
status = PSQL_CMD_UNKNOWN;
}
if (pattern)
free(pattern);
}
/*
* \e or \edit -- edit the current query buffer, or edit a file and make
* it the query buffer
*/
else if (strcmp(cmd, "e") == 0 || strcmp(cmd, "edit") == 0)
{
if (!query_buf)
{
psql_error("no query buffer\n");
status = PSQL_CMD_ERROR;
}
else
{
char *fname;
fname = psql_scan_slash_option(scan_state,
OT_NORMAL, NULL, true);
expand_tilde(&fname);
if (fname)
canonicalize_path(fname);
if (do_edit(fname, query_buf, NULL))
status = PSQL_CMD_NEWEDIT;
else
status = PSQL_CMD_ERROR;
free(fname);
}
}
/*
* \ef -- edit the named function, or present a blank CREATE FUNCTION
* template if no argument is given
*/
else if (strcmp(cmd, "ef") == 0)
{
if (!query_buf)
{
psql_error("no query buffer\n");
status = PSQL_CMD_ERROR;
}
else
{
char *func;
Oid foid = InvalidOid;
func = psql_scan_slash_option(scan_state,
OT_WHOLE_LINE, NULL, true);
if (!func)
{
/* set up an empty command to fill in */
printfPQExpBuffer(query_buf,
"CREATE FUNCTION ( )\n"
" RETURNS \n"
" LANGUAGE \n"
" -- common options: IMMUTABLE STABLE STRICT SECURITY DEFINER\n"
"AS $function$\n"
"\n$function$\n");
}
else if (!lookup_function_oid(pset.db, func, &foid))
{
/* error already reported */
status = PSQL_CMD_ERROR;
}
else if (!get_create_function_cmd(pset.db, foid, query_buf))
{
/* error already reported */
status = PSQL_CMD_ERROR;
}
if (func)
free(func);
}
if (status != PSQL_CMD_ERROR)
{
bool edited = false;
if (!do_edit(0, query_buf, &edited))
status = PSQL_CMD_ERROR;
else if (!edited)
puts(_("No changes"));
else
status = PSQL_CMD_NEWEDIT;
}
}
/* \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 = psql_scan_slash_option(scan_state,
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 = psql_scan_slash_option(scan_state,
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);
pset.popt.topt.encoding = pset.encoding;
SetVariable(pset.vars, "ENCODING",
pg_encoding_to_char(pset.encoding));
}
free(encoding);
}
}
/* \f -- change field separator */
else if (strcmp(cmd, "f") == 0)
{
char *fname = psql_scan_slash_option(scan_state,
OT_NORMAL, NULL, false);
success = do_pset("fieldsep", fname, &pset.popt, pset.quiet);
free(fname);
}
/* \g means send query */
else if (strcmp(cmd, "g") == 0)
{
char *fname = psql_scan_slash_option(scan_state,
OT_FILEPIPE, NULL, false);
if (!fname)
pset.gfname = NULL;
else
{
expand_tilde(&fname);
pset.gfname = pg_strdup(fname);
}
free(fname);
status = PSQL_CMD_SEND;
}
/* help */
else if (strcmp(cmd, "h") == 0 || strcmp(cmd, "help") == 0)
{
char *opt = psql_scan_slash_option(scan_state,
OT_WHOLE_LINE, NULL, false);
size_t len;
/* strip any trailing spaces and semicolons */
if (opt)
{
len = strlen(opt);
while (len > 0 &&
(isspace((unsigned char) opt[len - 1])
|| opt[len - 1] == ';'))
opt[--len] = '\0';
}
helpSQL(opt, pset.popt.topt.pager);
free(opt);
}
/* 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, pset.quiet);
else
success = do_pset("format", "aligned", &pset.popt, pset.quiet);
}
/* \i is include file */
else if (strcmp(cmd, "i") == 0 || strcmp(cmd, "include") == 0)
{
char *fname = psql_scan_slash_option(scan_state,
OT_NORMAL, NULL, true);
if (!fname)
{
psql_error("\\%s: missing required argument\n", cmd);
success = false;
}
else
{
expand_tilde(&fname);
success = (process_file(fname, false) == 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 = psql_scan_slash_option(scan_state,
OT_NORMAL, NULL, true);
opt2 = psql_scan_slash_option(scan_state,
OT_NORMAL, NULL, true);
if (strcmp(cmd + 3, "export") == 0)
{
if (!opt2)
{
psql_error("\\%s: missing required argument\n", cmd);
success = false;
}
else
{
expand_tilde(&opt2);
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
{
expand_tilde(&opt1);
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 = PSQL_CMD_UNKNOWN;
free(opt1);
free(opt2);
}
/* \o -- set query output */
else if (strcmp(cmd, "o") == 0 || strcmp(cmd, "out") == 0)
{
char *fname = psql_scan_slash_option(scan_state,
OT_FILEPIPE, NULL, true);
expand_tilde(&fname);
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 (!pset.quiet)
puts(_("Query buffer is empty."));
fflush(stdout);
}
/* \password -- set user password */
else if (strcmp(cmd, "password") == 0)
{
char *pw1;
char *pw2;
pw1 = simple_prompt("Enter new password: "******"Enter it again: ", 100, false);
if (strcmp(pw1, pw2) != 0)
{
fprintf(stderr, _("Passwords didn't match.\n"));
success = false;
}
else
{
char *opt0 = psql_scan_slash_option(scan_state, OT_SQLID, NULL, true);
char *user;
char *encrypted_password;
if (opt0)
user = opt0;
else
user = PQuser(pset.db);
encrypted_password = PQencryptPassword(pw1, user);
if (!encrypted_password)
{
fprintf(stderr, _("Password encryption failed.\n"));
success = false;
}
else
{
PQExpBufferData buf;
PGresult *res;
initPQExpBuffer(&buf);
printfPQExpBuffer(&buf, "ALTER USER %s PASSWORD ",
fmtId(user));
appendStringLiteralConn(&buf, encrypted_password, pset.db);
res = PSQLexec(buf.data, false);
termPQExpBuffer(&buf);
if (!res)
success = false;
else
PQclear(res);
PQfreemem(encrypted_password);
}
}
free(pw1);
free(pw2);
}
/* \prompt -- prompt and set variable */
else if (strcmp(cmd, "prompt") == 0)
{
char *opt,
*prompt_text = NULL;
char *arg1,
*arg2;
arg1 = psql_scan_slash_option(scan_state, OT_NORMAL, NULL, false);
arg2 = psql_scan_slash_option(scan_state, OT_NORMAL, NULL, false);
if (!arg1)
{
psql_error("\\%s: missing required argument\n", cmd);
success = false;
}
else
{
char *result;
if (arg2)
{
prompt_text = arg1;
opt = arg2;
}
else
opt = arg1;
if (!pset.inputfile)
result = simple_prompt(prompt_text, 4096, true);
else
{
if (prompt_text)
{
fputs(prompt_text, stdout);
fflush(stdout);
}
result = gets_fromFile(stdin);
}
if (!SetVariable(pset.vars, opt, result))
{
psql_error("\\%s: error\n", cmd);
success = false;
}
free(result);
if (prompt_text)
free(prompt_text);
free(opt);
}
}
/* \pset -- set printing parameters */
else if (strcmp(cmd, "pset") == 0)
{
char *opt0 = psql_scan_slash_option(scan_state,
OT_NORMAL, NULL, false);
char *opt1 = psql_scan_slash_option(scan_state,
OT_NORMAL, NULL, false);
if (!opt0)
{
psql_error("\\%s: missing required argument\n", cmd);
success = false;
}
else
success = do_pset(opt0, opt1, &pset.popt, pset.quiet);
free(opt0);
free(opt1);
}
/* \q or \quit */
else if (strcmp(cmd, "q") == 0 || strcmp(cmd, "quit") == 0)
status = PSQL_CMD_TERMINATE;
/* reset(clear) the buffer */
else if (strcmp(cmd, "r") == 0 || strcmp(cmd, "reset") == 0)
{
resetPQExpBuffer(query_buf);
psql_scan_reset(scan_state);
if (!pset.quiet)
puts(_("Query buffer reset (cleared)."));
}
/* \s save history in a file or show it on the screen */
else if (strcmp(cmd, "s") == 0)
{
char *fname = psql_scan_slash_option(scan_state,
OT_NORMAL, NULL, true);
#if defined(WIN32) && !defined(__CYGWIN__)
/*
* XXX This does not work for all terminal environments or for output
* containing non-ASCII characters; see comments in simple_prompt().
*/
#define DEVTTY "con"
#else
#define DEVTTY "/dev/tty"
#endif
expand_tilde(&fname);
/* This scrolls off the screen when using /dev/tty */
success = saveHistory(fname ? fname : DEVTTY, -1, false, false);
if (success && !pset.quiet && fname)
printf(gettext("Wrote history to file \"%s/%s\".\n"),
pset.dirname ? pset.dirname : ".", fname);
if (!fname)
putchar('\n');
free(fname);
}
/* \set -- generalized set variable/option command */
else if (strcmp(cmd, "set") == 0)
{
char *opt0 = psql_scan_slash_option(scan_state,
OT_NORMAL, NULL, false);
if (!opt0)
{
/* list all variables */
PrintVariables(pset.vars);
success = true;
}
else
{
/*
* Set variable to the concatenation of the arguments.
*/
char *newval;
char *opt;
opt = psql_scan_slash_option(scan_state,
OT_NORMAL, NULL, false);
newval = pg_strdup(opt ? opt : "");
free(opt);
while ((opt = psql_scan_slash_option(scan_state,
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)
{
char *opt = psql_scan_slash_option(scan_state,
OT_NORMAL, NULL, true);
success = do_pset("tuples_only", opt, &pset.popt, pset.quiet);
free(opt);
}
/* \T -- define html <table ...> attributes */
else if (strcmp(cmd, "T") == 0)
{
char *value = psql_scan_slash_option(scan_state,
OT_NORMAL, NULL, false);
success = do_pset("tableattr", value, &pset.popt, pset.quiet);
free(value);
}
/* \timing -- toggle timing of queries */
else if (strcmp(cmd, "timing") == 0)
{
char *opt = psql_scan_slash_option(scan_state,
OT_NORMAL, NULL, false);
if (opt)
pset.timing = ParseVariableBool(opt);
else
pset.timing = !pset.timing;
if (!pset.quiet)
{
if (pset.timing)
puts(_("Timing is on."));
else
puts(_("Timing is off."));
}
free(opt);
}
/* \unset */
else if (strcmp(cmd, "unset") == 0)
{
char *opt = psql_scan_slash_option(scan_state,
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 = PSQL_CMD_ERROR;
}
else
{
fname = psql_scan_slash_option(scan_state,
OT_FILEPIPE, NULL, true);
expand_tilde(&fname);
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
{
canonicalize_path(fname);
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)
{
char *opt = psql_scan_slash_option(scan_state,
OT_NORMAL, NULL, true);
success = do_pset("expanded", opt, &pset.popt, pset.quiet);
free(opt);
}
/* \z -- list table rights (equivalent to \dp) */
else if (strcmp(cmd, "z") == 0)
{
char *pattern = psql_scan_slash_option(scan_state,
OT_NORMAL, NULL, true);
success = permissionsList(pattern);
if (pattern)
free(pattern);
}
/* \! -- shell escape */
else if (strcmp(cmd, "!") == 0)
{
char *opt = psql_scan_slash_option(scan_state,
OT_WHOLE_LINE, NULL, false);
success = do_shell(opt);
free(opt);
}
/* \? -- 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;
while ((value = psql_scan_slash_option(scan_state,
OT_NORMAL, NULL, true)))
{
fprintf(stderr, "+ opt(%d) = |%s|\n", i++, value);
free(value);
}
}
#endif
else
status = PSQL_CMD_UNKNOWN;
if (!success)
status = PSQL_CMD_ERROR;
return status;
}
/*
* Main processing loop for reading lines of input
* and sending them to the backend.
*
* This loop is re-entrant. May be called by \i command
* which reads input from a file.
*/
int
MainLoop(FILE *source)
{
PsqlScanState scan_state; /* lexer working state */
PQExpBuffer query_buf; /* buffer for query being accumulated */
PQExpBuffer previous_buf; /* if there isn't anything in the new
* buffer yet, use this one for \e, etc. */
char *line; /* current line of input */
int added_nl_pos;
bool success;
volatile int successResult = EXIT_SUCCESS;
volatile backslashResult slashCmdStatus = CMD_UNKNOWN;
volatile promptStatus_t prompt_status = PROMPT_READY;
volatile int count_eof = 0;
volatile bool die_on_error = false;
/* Save the prior command source */
FILE *prev_cmd_source;
bool prev_cmd_interactive;
unsigned int prev_lineno;
/* Save old settings */
prev_cmd_source = pset.cur_cmd_source;
prev_cmd_interactive = pset.cur_cmd_interactive;
prev_lineno = pset.lineno;
/* Establish new source */
pset.cur_cmd_source = source;
pset.cur_cmd_interactive = ((source == stdin) && !pset.notty);
pset.lineno = 0;
/* Create working state */
scan_state = psql_scan_create();
query_buf = createPQExpBuffer();
previous_buf = createPQExpBuffer();
if (!query_buf || !previous_buf)
{
psql_error("out of memory\n");
exit(EXIT_FAILURE);
}
/* main loop to get queries and execute them */
while (successResult == EXIT_SUCCESS)
{
/*
* Welcome code for Control-C
*/
if (cancel_pressed)
{
if (!pset.cur_cmd_interactive)
{
/*
* You get here if you stopped a script with Ctrl-C and a
* query cancel was issued. In that case we don't do the
* longjmp, so the query routine can finish nicely.
*/
successResult = EXIT_USER;
break;
}
cancel_pressed = false;
}
#ifndef WIN32
if (sigsetjmp(main_loop_jmp, 1) != 0)
{
/* got here with longjmp */
/* reset parsing state */
resetPQExpBuffer(query_buf);
psql_scan_finish(scan_state);
psql_scan_reset(scan_state);
count_eof = 0;
slashCmdStatus = CMD_UNKNOWN;
prompt_status = PROMPT_READY;
if (pset.cur_cmd_interactive)
putc('\n', stdout);
else
{
successResult = EXIT_USER;
break;
}
}
/*
* establish the control-C handler only after main_loop_jmp is
* ready
*/
pqsignal(SIGINT, handle_sigint); /* control-C => cancel */
#else /* WIN32 */
setup_cancel_handler();
#endif
fflush(stdout);
if (slashCmdStatus == CMD_NEWEDIT)
{
/*
* just returned from editing the line? then just copy to the
* input buffer
*/
line = pg_strdup(query_buf->data);
/* reset parsing state since we are rescanning whole line */
resetPQExpBuffer(query_buf);
psql_scan_reset(scan_state);
slashCmdStatus = CMD_UNKNOWN;
prompt_status = PROMPT_READY;
}
/*
* otherwise, get another line
*/
else if (pset.cur_cmd_interactive)
{
/* May need to reset prompt, eg after \r command */
if (query_buf->len == 0)
prompt_status = PROMPT_READY;
line = gets_interactive(get_prompt(prompt_status));
}
else
line = gets_fromFile(source);
/*
* query_buf holds query already accumulated. line is the
* malloc'd new line of input (note it must be freed before
* looping around!)
*/
/* No more input. Time to quit, or \i done */
if (line == NULL)
{
if (pset.cur_cmd_interactive)
{
/* This tries to mimic bash's IGNOREEOF feature. */
count_eof++;
if (count_eof < GetVariableNum(pset.vars, "IGNOREEOF", 0, 10, false))
{
if (!QUIET())
printf(gettext("Use \"\\q\" to leave %s.\n"), pset.progname);
continue;
}
puts(QUIET() ? "" : "\\q");
}
break;
}
count_eof = 0;
pset.lineno++;
/* nothing left on line? then ignore */
if (line[0] == '\0' && !psql_scan_in_quote(scan_state))
{
free(line);
continue;
}
/* echo back if flag is set */
if (!pset.cur_cmd_interactive &&
VariableEquals(pset.vars, "ECHO", "all"))
puts(line);
fflush(stdout);
/* insert newlines into query buffer between source lines */
if (query_buf->len > 0)
{
appendPQExpBufferChar(query_buf, '\n');
added_nl_pos = query_buf->len;
}
else
added_nl_pos = -1; /* flag we didn't add one */
/* Setting this will not have effect until next line. */
die_on_error = GetVariableBool(pset.vars, "ON_ERROR_STOP");
/*
* Parse line, looking for command separators.
*/
psql_scan_setup(scan_state, line, strlen(line));
success = true;
while (success || !die_on_error)
{
PsqlScanResult scan_result;
promptStatus_t prompt_tmp = prompt_status;
scan_result = psql_scan(scan_state, query_buf, &prompt_tmp);
prompt_status = prompt_tmp;
/*
* Send command if semicolon found, or if end of line and
* we're in single-line mode.
*/
if (scan_result == PSCAN_SEMICOLON ||
(scan_result == PSCAN_EOL &&
GetVariableBool(pset.vars, "SINGLELINE")))
{
/* execute query */
success = SendQuery(query_buf->data);
slashCmdStatus = success ? CMD_SEND : CMD_ERROR;
resetPQExpBuffer(previous_buf);
appendPQExpBufferStr(previous_buf, query_buf->data);
resetPQExpBuffer(query_buf);
added_nl_pos = -1;
/* we need not do psql_scan_reset() here */
}
else if (scan_result == PSCAN_BACKSLASH)
{
/* handle backslash command */
/*
* If we added a newline to query_buf, and nothing else
* has been inserted in query_buf by the lexer, then strip
* off the newline again. This avoids any change to
* query_buf when a line contains only a backslash
* command.
*/
if (query_buf->len == added_nl_pos)
query_buf->data[--query_buf->len] = '\0';
added_nl_pos = -1;
slashCmdStatus = HandleSlashCmds(scan_state,
query_buf->len > 0 ?
query_buf : previous_buf);
success = slashCmdStatus != CMD_ERROR;
if ((slashCmdStatus == CMD_SEND || slashCmdStatus == CMD_NEWEDIT) &&
query_buf->len == 0)
{
/* copy previous buffer to current for handling */
appendPQExpBufferStr(query_buf, previous_buf->data);
}
if (slashCmdStatus == CMD_SEND)
{
success = SendQuery(query_buf->data);
resetPQExpBuffer(previous_buf);
appendPQExpBufferStr(previous_buf, query_buf->data);
resetPQExpBuffer(query_buf);
/* flush any paren nesting info after forced send */
psql_scan_reset(scan_state);
}
if (slashCmdStatus == CMD_TERMINATE)
break;
}
/* fall out of loop if lexer reached EOL */
if (scan_result == PSCAN_INCOMPLETE ||
scan_result == PSCAN_EOL)
break;
}
psql_scan_finish(scan_state);
free(line);
if (slashCmdStatus == CMD_TERMINATE)
{
successResult = EXIT_SUCCESS;
break;
}
if (!pset.cur_cmd_interactive)
{
if (!success && die_on_error)
successResult = EXIT_USER;
/* Have we lost the db connection? */
else if (!pset.db)
successResult = EXIT_BADCONN;
}
} /* while !endoffile/session */
/*
* Process query at the end of file without a semicolon
*/
if (query_buf->len > 0 && !pset.cur_cmd_interactive &&
successResult == EXIT_SUCCESS)
{
success = SendQuery(query_buf->data);
if (!success && die_on_error)
successResult = EXIT_USER;
else if (pset.db == NULL)
successResult = EXIT_BADCONN;
}
/*
* Reset SIGINT handler because main_loop_jmp will be invalid as soon
* as we exit this routine. If there is an outer MainLoop instance,
* it will re-enable ^C catching as soon as it gets back to the top of
* its loop and resets main_loop_jmp to point to itself.
*/
#ifndef WIN32
pqsignal(SIGINT, SIG_DFL);
#endif
destroyPQExpBuffer(query_buf);
destroyPQExpBuffer(previous_buf);
psql_scan_destroy(scan_state);
pset.cur_cmd_source = prev_cmd_source;
pset.cur_cmd_interactive = prev_cmd_interactive;
pset.lineno = prev_lineno;
return successResult;
} /* MainLoop() */
/*
* Main processing loop for reading lines of input
* and sending them to the backend.
*
* This loop is re-entrant. May be called by \i command
* which reads input from a file.
*/
int
MainLoop(FILE *source)
{
PsqlScanState scan_state; /* lexer working state */
volatile PQExpBuffer query_buf; /* buffer for query being accumulated */
volatile PQExpBuffer previous_buf; /* if there isn't anything in the new
* buffer yet, use this one for \e,
* etc. */
PQExpBuffer history_buf; /* earlier lines of a multi-line command, not
* yet saved to readline history */
char *line; /* current line of input */
int added_nl_pos;
bool success;
bool line_saved_in_history;
volatile int successResult = EXIT_SUCCESS;
volatile backslashResult slashCmdStatus = PSQL_CMD_UNKNOWN;
volatile promptStatus_t prompt_status = PROMPT_READY;
volatile int count_eof = 0;
volatile bool die_on_error = false;
/* Save the prior command source */
FILE *prev_cmd_source;
bool prev_cmd_interactive;
uint64 prev_lineno;
/* Save old settings */
prev_cmd_source = pset.cur_cmd_source;
prev_cmd_interactive = pset.cur_cmd_interactive;
prev_lineno = pset.lineno;
/* Establish new source */
pset.cur_cmd_source = source;
pset.cur_cmd_interactive = ((source == stdin) && !pset.notty);
pset.lineno = 0;
/* Create working state */
scan_state = psql_scan_create();
query_buf = createPQExpBuffer();
previous_buf = createPQExpBuffer();
history_buf = createPQExpBuffer();
if (PQExpBufferBroken(query_buf) ||
PQExpBufferBroken(previous_buf) ||
PQExpBufferBroken(history_buf))
{
psql_error("out of memory\n");
exit(EXIT_FAILURE);
}
/* main loop to get queries and execute them */
while (successResult == EXIT_SUCCESS)
{
/*
* Clean up after a previous Control-C
*/
if (cancel_pressed)
{
if (!pset.cur_cmd_interactive)
{
/*
* You get here if you stopped a script with Ctrl-C.
*/
successResult = EXIT_USER;
break;
}
cancel_pressed = false;
}
/*
* Establish longjmp destination for exiting from wait-for-input. We
* must re-do this each time through the loop for safety, since the
* jmpbuf might get changed during command execution.
*/
if (sigsetjmp(sigint_interrupt_jmp, 1) != 0)
{
/* got here with longjmp */
/* reset parsing state */
psql_scan_finish(scan_state);
psql_scan_reset(scan_state);
resetPQExpBuffer(query_buf);
resetPQExpBuffer(history_buf);
count_eof = 0;
slashCmdStatus = PSQL_CMD_UNKNOWN;
prompt_status = PROMPT_READY;
cancel_pressed = false;
if (pset.cur_cmd_interactive)
putc('\n', stdout);
else
{
successResult = EXIT_USER;
break;
}
}
fflush(stdout);
/*
* get another line
*/
if (pset.cur_cmd_interactive)
{
/* May need to reset prompt, eg after \r command */
if (query_buf->len == 0)
prompt_status = PROMPT_READY;
line = gets_interactive(get_prompt(prompt_status));
}
else
{
line = gets_fromFile(source);
if (!line && ferror(source))
successResult = EXIT_FAILURE;
}
/*
* query_buf holds query already accumulated. line is the malloc'd
* new line of input (note it must be freed before looping around!)
*/
/* No more input. Time to quit, or \i done */
if (line == NULL)
{
if (pset.cur_cmd_interactive)
{
/* This tries to mimic bash's IGNOREEOF feature. */
count_eof++;
if (count_eof < GetVariableNum(pset.vars, "IGNOREEOF", 0, 10, false))
{
if (!pset.quiet)
printf(_("Use \"\\q\" to leave %s.\n"), pset.progname);
continue;
}
puts(pset.quiet ? "" : "\\q");
}
break;
}
count_eof = 0;
pset.lineno++;
/* ignore UTF-8 Unicode byte-order mark */
if (pset.lineno == 1 && pset.encoding == PG_UTF8 && strncmp(line, "\xef\xbb\xbf", 3) == 0)
memmove(line, line + 3, strlen(line + 3) + 1);
/* nothing left on line? then ignore */
if (line[0] == '\0' && !psql_scan_in_quote(scan_state))
{
free(line);
continue;
}
/* A request for help? Be friendly and give them some guidance */
if (pset.cur_cmd_interactive && query_buf->len == 0 &&
pg_strncasecmp(line, "help", 4) == 0 &&
(line[4] == '\0' || line[4] == ';' || isspace((unsigned char) line[4])))
{
free(line);
puts(_("You are using psql, the command-line interface to PostgreSQL."));
printf(_("Type: \\copyright for distribution terms\n"
" \\h for help with SQL commands\n"
" \\? for help with psql commands\n"
" \\g or terminate with semicolon to execute query\n"
" \\q to quit\n"));
fflush(stdout);
continue;
}
/* echo back if flag is set */
if (pset.echo == PSQL_ECHO_ALL && !pset.cur_cmd_interactive)
puts(line);
fflush(stdout);
/* insert newlines into query buffer between source lines */
if (query_buf->len > 0)
{
appendPQExpBufferChar(query_buf, '\n');
added_nl_pos = query_buf->len;
}
else
added_nl_pos = -1; /* flag we didn't add one */
/* Setting this will not have effect until next line. */
die_on_error = pset.on_error_stop;
/*
* Parse line, looking for command separators.
*/
psql_scan_setup(scan_state, line, strlen(line));
success = true;
line_saved_in_history = false;
while (success || !die_on_error)
{
PsqlScanResult scan_result;
promptStatus_t prompt_tmp = prompt_status;
scan_result = psql_scan(scan_state, query_buf, &prompt_tmp);
prompt_status = prompt_tmp;
if (PQExpBufferBroken(query_buf))
{
psql_error("out of memory\n");
exit(EXIT_FAILURE);
}
/*
* Send command if semicolon found, or if end of line and we're in
* single-line mode.
*/
if (scan_result == PSCAN_SEMICOLON ||
(scan_result == PSCAN_EOL && pset.singleline))
{
/*
* Save query in history. We use history_buf to accumulate
* multi-line queries into a single history entry.
*/
if (pset.cur_cmd_interactive && !line_saved_in_history)
{
pg_append_history(line, history_buf);
pg_send_history(history_buf);
line_saved_in_history = true;
}
/* execute query */
success = SendQuery(query_buf->data);
slashCmdStatus = success ? PSQL_CMD_SEND : PSQL_CMD_ERROR;
/* transfer query to previous_buf by pointer-swapping */
{
PQExpBuffer swap_buf = previous_buf;
previous_buf = query_buf;
query_buf = swap_buf;
}
resetPQExpBuffer(query_buf);
added_nl_pos = -1;
/* we need not do psql_scan_reset() here */
}
else if (scan_result == PSCAN_BACKSLASH)
{
/* handle backslash command */
/*
* If we added a newline to query_buf, and nothing else has
* been inserted in query_buf by the lexer, then strip off the
* newline again. This avoids any change to query_buf when a
* line contains only a backslash command. Also, in this
* situation we force out any previous lines as a separate
* history entry; we don't want SQL and backslash commands
* intermixed in history if at all possible.
*/
if (query_buf->len == added_nl_pos)
{
query_buf->data[--query_buf->len] = '\0';
pg_send_history(history_buf);
}
added_nl_pos = -1;
/* save backslash command in history */
if (pset.cur_cmd_interactive && !line_saved_in_history)
{
pg_append_history(line, history_buf);
pg_send_history(history_buf);
line_saved_in_history = true;
}
/* execute backslash command */
slashCmdStatus = HandleSlashCmds(scan_state,
query_buf->len > 0 ?
query_buf : previous_buf);
success = slashCmdStatus != PSQL_CMD_ERROR;
if ((slashCmdStatus == PSQL_CMD_SEND || slashCmdStatus == PSQL_CMD_NEWEDIT) &&
query_buf->len == 0)
{
/* copy previous buffer to current for handling */
appendPQExpBufferStr(query_buf, previous_buf->data);
}
if (slashCmdStatus == PSQL_CMD_SEND)
{
success = SendQuery(query_buf->data);
/* transfer query to previous_buf by pointer-swapping */
{
PQExpBuffer swap_buf = previous_buf;
previous_buf = query_buf;
query_buf = swap_buf;
}
resetPQExpBuffer(query_buf);
/* flush any paren nesting info after forced send */
psql_scan_reset(scan_state);
}
else if (slashCmdStatus == PSQL_CMD_NEWEDIT)
{
/* rescan query_buf as new input */
psql_scan_finish(scan_state);
free(line);
line = pg_strdup(query_buf->data);
resetPQExpBuffer(query_buf);
/* reset parsing state since we are rescanning whole line */
psql_scan_reset(scan_state);
psql_scan_setup(scan_state, line, strlen(line));
line_saved_in_history = false;
prompt_status = PROMPT_READY;
}
else if (slashCmdStatus == PSQL_CMD_TERMINATE)
break;
}
/* fall out of loop if lexer reached EOL */
if (scan_result == PSCAN_INCOMPLETE ||
scan_result == PSCAN_EOL)
break;
}
/* Add line to pending history if we didn't execute anything yet */
if (pset.cur_cmd_interactive && !line_saved_in_history)
pg_append_history(line, history_buf);
psql_scan_finish(scan_state);
free(line);
if (slashCmdStatus == PSQL_CMD_TERMINATE)
{
successResult = EXIT_SUCCESS;
break;
}
if (!pset.cur_cmd_interactive)
{
if (!success && die_on_error)
successResult = EXIT_USER;
/* Have we lost the db connection? */
else if (!pset.db)
successResult = EXIT_BADCONN;
}
} /* while !endoffile/session */
/*
* Process query at the end of file without a semicolon
*/
if (query_buf->len > 0 && !pset.cur_cmd_interactive &&
successResult == EXIT_SUCCESS)
{
/* save query in history */
if (pset.cur_cmd_interactive)
pg_send_history(history_buf);
/* execute query */
success = SendQuery(query_buf->data);
if (!success && die_on_error)
successResult = EXIT_USER;
else if (pset.db == NULL)
successResult = EXIT_BADCONN;
}
/*
* Let's just make real sure the SIGINT handler won't try to use
* sigint_interrupt_jmp after we exit this routine. If there is an outer
* MainLoop instance, it will reset sigint_interrupt_jmp to point to
* itself at the top of its loop, before any further interactive input
* happens.
*/
sigint_interrupt_enabled = false;
destroyPQExpBuffer(query_buf);
destroyPQExpBuffer(previous_buf);
destroyPQExpBuffer(history_buf);
psql_scan_destroy(scan_state);
pset.cur_cmd_source = prev_cmd_source;
pset.cur_cmd_interactive = prev_cmd_interactive;
pset.lineno = prev_lineno;
return successResult;
} /* MainLoop() */
/*
* Main processing loop for reading lines of input
* and sending them to the backend.
*
* This loop is re-entrant. May be called by \i command
* which reads input from a file.
*/
int
MainLoop(FILE *source)
{
PsqlScanState scan_state; /* lexer working state */
ConditionalStack cond_stack; /* \if status stack */
volatile PQExpBuffer query_buf; /* buffer for query being accumulated */
volatile PQExpBuffer previous_buf; /* if there isn't anything in the new
* buffer yet, use this one for \e,
* etc. */
PQExpBuffer history_buf; /* earlier lines of a multi-line command, not
* yet saved to readline history */
char *line; /* current line of input */
int added_nl_pos;
bool success;
bool line_saved_in_history;
volatile int successResult = EXIT_SUCCESS;
volatile backslashResult slashCmdStatus = PSQL_CMD_UNKNOWN;
volatile promptStatus_t prompt_status = PROMPT_READY;
volatile int count_eof = 0;
volatile bool die_on_error = false;
FILE *prev_cmd_source;
bool prev_cmd_interactive;
uint64 prev_lineno;
/* Save the prior command source */
prev_cmd_source = pset.cur_cmd_source;
prev_cmd_interactive = pset.cur_cmd_interactive;
prev_lineno = pset.lineno;
/* pset.stmt_lineno does not need to be saved and restored */
/* Establish new source */
pset.cur_cmd_source = source;
pset.cur_cmd_interactive = ((source == stdin) && !pset.notty);
pset.lineno = 0;
pset.stmt_lineno = 1;
/* Create working state */
scan_state = psql_scan_create(&psqlscan_callbacks);
cond_stack = conditional_stack_create();
psql_scan_set_passthrough(scan_state, (void *) cond_stack);
query_buf = createPQExpBuffer();
previous_buf = createPQExpBuffer();
history_buf = createPQExpBuffer();
if (PQExpBufferBroken(query_buf) ||
PQExpBufferBroken(previous_buf) ||
PQExpBufferBroken(history_buf))
{
psql_error("out of memory\n");
exit(EXIT_FAILURE);
}
/* main loop to get queries and execute them */
while (successResult == EXIT_SUCCESS)
{
/*
* Clean up after a previous Control-C
*/
if (cancel_pressed)
{
if (!pset.cur_cmd_interactive)
{
/*
* You get here if you stopped a script with Ctrl-C.
*/
successResult = EXIT_USER;
break;
}
cancel_pressed = false;
}
/*
* Establish longjmp destination for exiting from wait-for-input. We
* must re-do this each time through the loop for safety, since the
* jmpbuf might get changed during command execution.
*/
if (sigsetjmp(sigint_interrupt_jmp, 1) != 0)
{
/* got here with longjmp */
/* reset parsing state */
psql_scan_finish(scan_state);
psql_scan_reset(scan_state);
resetPQExpBuffer(query_buf);
resetPQExpBuffer(history_buf);
count_eof = 0;
slashCmdStatus = PSQL_CMD_UNKNOWN;
prompt_status = PROMPT_READY;
pset.stmt_lineno = 1;
cancel_pressed = false;
if (pset.cur_cmd_interactive)
{
putc('\n', stdout);
/*
* if interactive user is in an \if block, then Ctrl-C will
* exit from the innermost \if.
*/
if (!conditional_stack_empty(cond_stack))
{
psql_error("\\if: escaped\n");
conditional_stack_pop(cond_stack);
}
}
else
{
successResult = EXIT_USER;
break;
}
}
fflush(stdout);
/*
* get another line
*/
if (pset.cur_cmd_interactive)
{
/* May need to reset prompt, eg after \r command */
if (query_buf->len == 0)
prompt_status = PROMPT_READY;
line = gets_interactive(get_prompt(prompt_status, cond_stack),
query_buf);
}
else
{
line = gets_fromFile(source);
if (!line && ferror(source))
successResult = EXIT_FAILURE;
}
/*
* query_buf holds query already accumulated. line is the malloc'd
* new line of input (note it must be freed before looping around!)
*/
/* No more input. Time to quit, or \i done */
if (line == NULL)
{
if (pset.cur_cmd_interactive)
{
/* This tries to mimic bash's IGNOREEOF feature. */
count_eof++;
if (count_eof < pset.ignoreeof)
{
if (!pset.quiet)
printf(_("Use \"\\q\" to leave %s.\n"), pset.progname);
continue;
}
puts(pset.quiet ? "" : "\\q");
}
break;
}
count_eof = 0;
pset.lineno++;
/* ignore UTF-8 Unicode byte-order mark */
if (pset.lineno == 1 && pset.encoding == PG_UTF8 && strncmp(line, "\xef\xbb\xbf", 3) == 0)
memmove(line, line + 3, strlen(line + 3) + 1);
/* Detect attempts to run custom-format dumps as SQL scripts */
if (pset.lineno == 1 && !pset.cur_cmd_interactive &&
strncmp(line, "PGDMP", 5) == 0)
{
free(line);
puts(_("The input is a PostgreSQL custom-format dump.\n"
"Use the pg_restore command-line client to restore this dump to a database.\n"));
fflush(stdout);
successResult = EXIT_FAILURE;
break;
}
/* no further processing of empty lines, unless within a literal */
if (line[0] == '\0' && !psql_scan_in_quote(scan_state))
{
free(line);
continue;
}
/* A request for help? Be friendly and give them some guidance */
if (pset.cur_cmd_interactive && query_buf->len == 0 &&
pg_strncasecmp(line, "help", 4) == 0 &&
(line[4] == '\0' || line[4] == ';' || isspace((unsigned char) line[4])))
{
free(line);
puts(_("You are using psql, the command-line interface to PostgreSQL."));
printf(_("Type: \\copyright for distribution terms\n"
" \\h for help with SQL commands\n"
" \\? for help with psql commands\n"
" \\g or terminate with semicolon to execute query\n"
" \\q to quit\n"));
fflush(stdout);
continue;
}
/* echo back if flag is set, unless interactive */
if (pset.echo == PSQL_ECHO_ALL && !pset.cur_cmd_interactive)
{
puts(line);
fflush(stdout);
}
/* insert newlines into query buffer between source lines */
if (query_buf->len > 0)
{
appendPQExpBufferChar(query_buf, '\n');
added_nl_pos = query_buf->len;
}
else
added_nl_pos = -1; /* flag we didn't add one */
/* Setting this will not have effect until next line. */
die_on_error = pset.on_error_stop;
/*
* Parse line, looking for command separators.
*/
psql_scan_setup(scan_state, line, strlen(line),
pset.encoding, standard_strings());
success = true;
line_saved_in_history = false;
while (success || !die_on_error)
{
PsqlScanResult scan_result;
promptStatus_t prompt_tmp = prompt_status;
size_t pos_in_query;
char *tmp_line;
pos_in_query = query_buf->len;
scan_result = psql_scan(scan_state, query_buf, &prompt_tmp);
prompt_status = prompt_tmp;
if (PQExpBufferBroken(query_buf))
{
psql_error("out of memory\n");
exit(EXIT_FAILURE);
}
/*
* Increase statement line number counter for each linebreak added
* to the query buffer by the last psql_scan() call. There only
* will be ones to add when navigating to a statement in
* readline's history containing newlines.
*/
tmp_line = query_buf->data + pos_in_query;
while (*tmp_line != '\0')
{
if (*(tmp_line++) == '\n')
pset.stmt_lineno++;
}
if (scan_result == PSCAN_EOL)
pset.stmt_lineno++;
/*
* Send command if semicolon found, or if end of line and we're in
* single-line mode.
*/
if (scan_result == PSCAN_SEMICOLON ||
(scan_result == PSCAN_EOL && pset.singleline))
{
/*
* Save line in history. We use history_buf to accumulate
* multi-line queries into a single history entry. Note that
* history accumulation works on input lines, so it doesn't
* matter whether the query will be ignored due to \if.
*/
if (pset.cur_cmd_interactive && !line_saved_in_history)
{
pg_append_history(line, history_buf);
pg_send_history(history_buf);
line_saved_in_history = true;
}
/* execute query unless we're in an inactive \if branch */
if (conditional_active(cond_stack))
{
success = SendQuery(query_buf->data);
slashCmdStatus = success ? PSQL_CMD_SEND : PSQL_CMD_ERROR;
pset.stmt_lineno = 1;
/* transfer query to previous_buf by pointer-swapping */
{
PQExpBuffer swap_buf = previous_buf;
previous_buf = query_buf;
query_buf = swap_buf;
}
resetPQExpBuffer(query_buf);
added_nl_pos = -1;
/* we need not do psql_scan_reset() here */
}
else
{
/* if interactive, warn about non-executed query */
if (pset.cur_cmd_interactive)
psql_error("query ignored; use \\endif or Ctrl-C to exit current \\if block\n");
/* fake an OK result for purposes of loop checks */
success = true;
slashCmdStatus = PSQL_CMD_SEND;
pset.stmt_lineno = 1;
/* note that query_buf doesn't change state */
}
}
else if (scan_result == PSCAN_BACKSLASH)
{
/* handle backslash command */
/*
* If we added a newline to query_buf, and nothing else has
* been inserted in query_buf by the lexer, then strip off the
* newline again. This avoids any change to query_buf when a
* line contains only a backslash command. Also, in this
* situation we force out any previous lines as a separate
* history entry; we don't want SQL and backslash commands
* intermixed in history if at all possible.
*/
if (query_buf->len == added_nl_pos)
{
query_buf->data[--query_buf->len] = '\0';
pg_send_history(history_buf);
}
added_nl_pos = -1;
/* save backslash command in history */
if (pset.cur_cmd_interactive && !line_saved_in_history)
{
pg_append_history(line, history_buf);
pg_send_history(history_buf);
line_saved_in_history = true;
}
/* execute backslash command */
slashCmdStatus = HandleSlashCmds(scan_state,
cond_stack,
query_buf,
previous_buf);
success = slashCmdStatus != PSQL_CMD_ERROR;
/*
* Resetting stmt_lineno after a backslash command isn't
* always appropriate, but it's what we've done historically
* and there have been few complaints.
*/
pset.stmt_lineno = 1;
if (slashCmdStatus == PSQL_CMD_SEND)
{
/* should not see this in inactive branch */
Assert(conditional_active(cond_stack));
success = SendQuery(query_buf->data);
/* transfer query to previous_buf by pointer-swapping */
{
PQExpBuffer swap_buf = previous_buf;
previous_buf = query_buf;
query_buf = swap_buf;
}
resetPQExpBuffer(query_buf);
/* flush any paren nesting info after forced send */
psql_scan_reset(scan_state);
}
else if (slashCmdStatus == PSQL_CMD_NEWEDIT)
{
/* should not see this in inactive branch */
Assert(conditional_active(cond_stack));
/* rescan query_buf as new input */
psql_scan_finish(scan_state);
free(line);
line = pg_strdup(query_buf->data);
resetPQExpBuffer(query_buf);
/* reset parsing state since we are rescanning whole line */
psql_scan_reset(scan_state);
psql_scan_setup(scan_state, line, strlen(line),
pset.encoding, standard_strings());
line_saved_in_history = false;
prompt_status = PROMPT_READY;
}
else if (slashCmdStatus == PSQL_CMD_TERMINATE)
break;
}
/* fall out of loop if lexer reached EOL */
if (scan_result == PSCAN_INCOMPLETE ||
scan_result == PSCAN_EOL)
break;
}
/* Add line to pending history if we didn't execute anything yet */
if (pset.cur_cmd_interactive && !line_saved_in_history)
pg_append_history(line, history_buf);
psql_scan_finish(scan_state);
free(line);
if (slashCmdStatus == PSQL_CMD_TERMINATE)
{
successResult = EXIT_SUCCESS;
break;
}
if (!pset.cur_cmd_interactive)
{
if (!success && die_on_error)
successResult = EXIT_USER;
/* Have we lost the db connection? */
else if (!pset.db)
successResult = EXIT_BADCONN;
}
} /* while !endoffile/session */
/*
* If we have a non-semicolon-terminated query at the end of file, we
* process it unless the input source is interactive --- in that case it
* seems better to go ahead and quit. Also skip if this is an error exit.
*/
if (query_buf->len > 0 && !pset.cur_cmd_interactive &&
successResult == EXIT_SUCCESS)
{
/* save query in history */
/* currently unneeded since we don't use this block if interactive */
#ifdef NOT_USED
if (pset.cur_cmd_interactive)
pg_send_history(history_buf);
#endif
/* execute query unless we're in an inactive \if branch */
if (conditional_active(cond_stack))
{
success = SendQuery(query_buf->data);
}
else
{
if (pset.cur_cmd_interactive)
psql_error("query ignored; use \\endif or Ctrl-C to exit current \\if block\n");
success = true;
}
if (!success && die_on_error)
successResult = EXIT_USER;
else if (pset.db == NULL)
successResult = EXIT_BADCONN;
}
/*
* Check for unbalanced \if-\endifs unless user explicitly quit, or the
* script is erroring out
*/
if (slashCmdStatus != PSQL_CMD_TERMINATE &&
successResult != EXIT_USER &&
!conditional_stack_empty(cond_stack))
{
psql_error("reached EOF without finding closing \\endif(s)\n");
if (die_on_error && !pset.cur_cmd_interactive)
successResult = EXIT_USER;
}
/*
* Let's just make real sure the SIGINT handler won't try to use
* sigint_interrupt_jmp after we exit this routine. If there is an outer
* MainLoop instance, it will reset sigint_interrupt_jmp to point to
* itself at the top of its loop, before any further interactive input
* happens.
*/
sigint_interrupt_enabled = false;
destroyPQExpBuffer(query_buf);
destroyPQExpBuffer(previous_buf);
destroyPQExpBuffer(history_buf);
psql_scan_destroy(scan_state);
conditional_stack_destroy(cond_stack);
pset.cur_cmd_source = prev_cmd_source;
pset.cur_cmd_interactive = prev_cmd_interactive;
pset.lineno = prev_lineno;
return successResult;
} /* MainLoop() */