/*
* strip_quotes
*
* Remove quotes from the string at *source. Leading and trailing occurrences
* of 'quote' are removed; embedded double occurrences of 'quote' are reduced
* to single occurrences; if 'escape' is not 0 then 'escape' removes special
* significance of next character.
*
* Note that the source string is overwritten in-place.
*/
static void
strip_quotes(char *source, char quote, char escape, int encoding)
{
char *src;
char *dst;
psql_assert(source);
psql_assert(quote);
src = dst = source;
if (*src && *src == quote)
src++; /* skip leading quote */
while (*src)
{
char c = *src;
int i;
if (c == quote && src[1] == '\0')
break; /* skip trailing quote */
else if (c == quote && src[1] == quote)
src++; /* process doubled quote */
else if (c == escape && src[1] != '\0')
src++; /* process escaped character */
i = PQmblen(src, encoding);
while (i--)
*dst++ = *src++;
}
*dst = '\0';
}
backslashResult
HandleSlashCmds(PsqlScanState scan_state,
PQExpBuffer query_buf)
{
backslashResult status = PSQL_CMD_SKIP_LINE;
char *cmd;
char *arg;
psql_assert(scan_state);
/* Parse off the command name */
cmd = psql_scan_slash_command(scan_state);
/* And try to execute it */
status = exec_command(cmd, scan_state, query_buf);
if (status == PSQL_CMD_UNKNOWN)
{
if (pset.cur_cmd_interactive)
fprintf(stderr, _("Invalid command \\%s. Try \\? for help.\n"), cmd);
else
psql_error("invalid command \\%s\n", cmd);
status = PSQL_CMD_ERROR;
}
if (status != PSQL_CMD_ERROR)
{
/* eat any remaining arguments after a valid command */
/* note we suppress evaluation of backticks here */
while ((arg = psql_scan_slash_option(scan_state,
OT_VERBATIM, NULL, false)))
{
psql_error("\\%s: extra argument \"%s\" ignored\n", cmd, arg);
free(arg);
}
}
else
{
/* silently throw away rest of line after an erroneous command */
while ((arg = psql_scan_slash_option(scan_state,
OT_WHOLE_LINE, NULL, false)))
free(arg);
}
/* if there is a trailing \\, swallow it */
psql_scan_slash_command_end(scan_state);
free(cmd);
/* some commands write to queryFout, so make sure output is sent */
fflush(pset.queryFout);
return status;
}
static bool
editFile(const char *fname)
{
const char *editorName;
char *sys;
int result;
psql_assert(fname);
/* Find an editor to use */
editorName = getenv("PSQL_EDITOR");
if (!editorName)
editorName = getenv("EDITOR");
if (!editorName)
editorName = getenv("VISUAL");
if (!editorName)
editorName = DEFAULT_EDITOR;
/*
* On Unix the EDITOR value should *not* be quoted, since it might include
* switches, eg, EDITOR="pico -t"; it's up to the user to put quotes in it
* if necessary. But this policy is not very workable on Windows, due to
* severe brain damage in their command shell plus the fact that standard
* program paths include spaces.
*/
sys = pg_malloc(strlen(editorName) + strlen(fname) + 10 + 1);
#ifndef WIN32
sprintf(sys, "exec %s '%s'", editorName, fname);
#else
sprintf(sys, SYSTEMQUOTE "\"%s\" \"%s\"" SYSTEMQUOTE, editorName, fname);
#endif
result = system(sys);
if (result == -1)
psql_error("could not start editor \"%s\"\n", editorName);
else if (result == 127)
psql_error("could not start /bin/sh\n");
free(sys);
return result == 0;
}
/*
* ExecQueryUsingCursor: run a SELECT-like query using a cursor
*
* This feature allows result sets larger than RAM to be dealt with.
*
* Returns true if the query executed successfully, false otherwise.
*
* If pset.timing is on, total query time (exclusive of result-printing) is
* stored into *elapsed_msec.
*/
static bool
ExecQueryUsingCursor(const char *query, double *elapsed_msec)
{
bool OK = true;
PGresult *results;
PQExpBufferData buf;
printQueryOpt my_popt = pset.popt;
FILE *queryFout_copy = pset.queryFout;
bool queryFoutPipe_copy = pset.queryFoutPipe;
bool started_txn = false;
bool did_pager = false;
int ntuples;
char fetch_cmd[64];
instr_time before,
after;
int flush_error;
*elapsed_msec = 0;
/* initialize print options for partial table output */
my_popt.topt.start_table = true;
my_popt.topt.stop_table = false;
my_popt.topt.prior_records = 0;
if (pset.timing)
INSTR_TIME_SET_CURRENT(before);
/* if we're not in a transaction, start one */
if (PQtransactionStatus(pset.db) == PQTRANS_IDLE)
{
results = PQexec(pset.db, "BEGIN");
OK = AcceptResult(results) &&
(PQresultStatus(results) == PGRES_COMMAND_OK);
PQclear(results);
if (!OK)
return false;
started_txn = true;
}
/* Send DECLARE CURSOR */
initPQExpBuffer(&buf);
appendPQExpBuffer(&buf, "DECLARE _psql_cursor NO SCROLL CURSOR FOR\n%s",
query);
results = PQexec(pset.db, buf.data);
OK = AcceptResult(results) &&
(PQresultStatus(results) == PGRES_COMMAND_OK);
PQclear(results);
termPQExpBuffer(&buf);
if (!OK)
goto cleanup;
if (pset.timing)
{
INSTR_TIME_SET_CURRENT(after);
INSTR_TIME_SUBTRACT(after, before);
*elapsed_msec += INSTR_TIME_GET_MILLISEC(after);
}
snprintf(fetch_cmd, sizeof(fetch_cmd),
"FETCH FORWARD %d FROM _psql_cursor",
pset.fetch_count);
/* prepare to write output to \g argument, if any */
if (pset.gfname)
{
/* keep this code in sync with PrintQueryTuples */
pset.queryFout = stdout; /* so it doesn't get closed */
/* open file/pipe */
if (!setQFout(pset.gfname))
{
pset.queryFout = queryFout_copy;
pset.queryFoutPipe = queryFoutPipe_copy;
OK = false;
goto cleanup;
}
}
/* clear any pre-existing error indication on the output stream */
clearerr(pset.queryFout);
for (;;)
{
if (pset.timing)
INSTR_TIME_SET_CURRENT(before);
/* get FETCH_COUNT tuples at a time */
results = PQexec(pset.db, fetch_cmd);
if (pset.timing)
{
INSTR_TIME_SET_CURRENT(after);
INSTR_TIME_SUBTRACT(after, before);
*elapsed_msec += INSTR_TIME_GET_MILLISEC(after);
}
if (PQresultStatus(results) != PGRES_TUPLES_OK)
{
/* shut down pager before printing error message */
if (did_pager)
{
ClosePager(pset.queryFout);
pset.queryFout = queryFout_copy;
pset.queryFoutPipe = queryFoutPipe_copy;
did_pager = false;
}
OK = AcceptResult(results);
psql_assert(!OK);
PQclear(results);
break;
}
ntuples = PQntuples(results);
if (ntuples < pset.fetch_count)
{
/* this is the last result set, so allow footer decoration */
my_popt.topt.stop_table = true;
}
else if (pset.queryFout == stdout && !did_pager)
{
/*
* If query requires multiple result sets, hack to ensure that
* only one pager instance is used for the whole mess
*/
pset.queryFout = PageOutput(100000, my_popt.topt.pager);
did_pager = true;
}
printQuery(results, &my_popt, pset.queryFout, pset.logfile);
PQclear(results);
/* after the first result set, disallow header decoration */
my_popt.topt.start_table = false;
my_popt.topt.prior_records += ntuples;
/*
* Make sure to flush the output stream, so intermediate results are
* visible to the client immediately. We check the results because if
* the pager dies/exits/etc, there's no sense throwing more data at
* it.
*/
flush_error = fflush(pset.queryFout);
/*
* Check if we are at the end, if a cancel was pressed, or if there
* were any errors either trying to flush out the results, or more
* generally on the output stream at all. If we hit any errors
* writing things to the stream, we presume $PAGER has disappeared and
* stop bothering to pull down more data.
*/
if (ntuples < pset.fetch_count || cancel_pressed || flush_error ||
ferror(pset.queryFout))
break;
}
/* close \g argument file/pipe, restore old setting */
if (pset.gfname)
{
/* keep this code in sync with PrintQueryTuples */
setQFout(NULL);
pset.queryFout = queryFout_copy;
pset.queryFoutPipe = queryFoutPipe_copy;
free(pset.gfname);
pset.gfname = NULL;
}
else if (did_pager)
{
ClosePager(pset.queryFout);
pset.queryFout = queryFout_copy;
pset.queryFoutPipe = queryFoutPipe_copy;
}
cleanup:
if (pset.timing)
INSTR_TIME_SET_CURRENT(before);
/*
* We try to close the cursor on either success or failure, but on failure
* ignore the result (it's probably just a bleat about being in an aborted
* transaction)
*/
results = PQexec(pset.db, "CLOSE _psql_cursor");
if (OK)
{
OK = AcceptResult(results) &&
(PQresultStatus(results) == PGRES_COMMAND_OK);
}
PQclear(results);
if (started_txn)
{
results = PQexec(pset.db, OK ? "COMMIT" : "ROLLBACK");
OK &= AcceptResult(results) &&
(PQresultStatus(results) == PGRES_COMMAND_OK);
PQclear(results);
}
if (pset.timing)
{
INSTR_TIME_SET_CURRENT(after);
INSTR_TIME_SUBTRACT(after, before);
*elapsed_msec += INSTR_TIME_GET_MILLISEC(after);
}
return OK;
}
bool
do_pset(const char *param, const char *value, printQueryOpt *popt, bool quiet)
{
size_t vallen = 0;
psql_assert(param);
if (value)
vallen = strlen(value);
/* set format */
if (strcmp(param, "format") == 0)
{
if (!value)
;
else if (pg_strncasecmp("unaligned", value, vallen) == 0)
popt->topt.format = PRINT_UNALIGNED;
else if (pg_strncasecmp("aligned", value, vallen) == 0)
popt->topt.format = PRINT_ALIGNED;
else if (pg_strncasecmp("wrapped", value, vallen) == 0)
popt->topt.format = PRINT_WRAPPED;
else if (pg_strncasecmp("html", value, vallen) == 0)
popt->topt.format = PRINT_HTML;
else if (pg_strncasecmp("latex", value, vallen) == 0)
popt->topt.format = PRINT_LATEX;
else if (pg_strncasecmp("troff-ms", value, vallen) == 0)
popt->topt.format = PRINT_TROFF_MS;
else
{
psql_error("\\pset: allowed formats are unaligned, aligned, wrapped, html, latex, troff-ms\n");
return false;
}
if (!quiet)
printf(_("Output format is %s.\n"), _align2string(popt->topt.format));
}
/* set table line style */
else if (strcmp(param, "linestyle") == 0)
{
if (!value)
;
else if (pg_strncasecmp("ascii", value, vallen) == 0)
popt->topt.line_style = &pg_asciiformat;
else if (pg_strncasecmp("old-ascii", value, vallen) == 0)
popt->topt.line_style = &pg_asciiformat_old;
else if (pg_strncasecmp("unicode", value, vallen) == 0)
popt->topt.line_style = &pg_utf8format;
else
{
psql_error("\\pset: allowed line styles are ascii, old-ascii, unicode\n");
return false;
}
if (!quiet)
printf(_("Line style is %s.\n"),
get_line_style(&popt->topt)->name);
}
/* set border style/width */
else if (strcmp(param, "border") == 0)
{
if (value)
popt->topt.border = atoi(value);
if (!quiet)
printf(_("Border style is %d.\n"), popt->topt.border);
}
/* set expanded/vertical mode */
else if (strcmp(param, "x") == 0 || strcmp(param, "expanded") == 0 || strcmp(param, "vertical") == 0)
{
if (value)
popt->topt.expanded = ParseVariableBool(value);
else
popt->topt.expanded = !popt->topt.expanded;
if (!quiet)
printf(popt->topt.expanded
? _("Expanded display is on.\n")
: _("Expanded display is off.\n"));
}
/* locale-aware numeric output */
else if (strcmp(param, "numericlocale") == 0)
{
if (value)
popt->topt.numericLocale = ParseVariableBool(value);
else
popt->topt.numericLocale = !popt->topt.numericLocale;
if (!quiet)
{
if (popt->topt.numericLocale)
puts(_("Showing locale-adjusted numeric output."));
else
puts(_("Locale-adjusted numeric output is off."));
}
}
/* null display */
else if (strcmp(param, "null") == 0)
{
if (value)
{
free(popt->nullPrint);
popt->nullPrint = pg_strdup(value);
}
if (!quiet)
printf(_("Null display is \"%s\".\n"), popt->nullPrint ? popt->nullPrint : "");
}
/* field separator for unaligned text */
else if (strcmp(param, "fieldsep") == 0)
{
if (value)
{
free(popt->topt.fieldSep);
popt->topt.fieldSep = pg_strdup(value);
}
if (!quiet)
printf(_("Field separator is \"%s\".\n"), popt->topt.fieldSep);
}
/* record separator for unaligned text */
else if (strcmp(param, "recordsep") == 0)
{
if (value)
{
free(popt->topt.recordSep);
popt->topt.recordSep = pg_strdup(value);
}
if (!quiet)
{
if (strcmp(popt->topt.recordSep, "\n") == 0)
printf(_("Record separator is <newline>."));
else
printf(_("Record separator is \"%s\".\n"), popt->topt.recordSep);
}
}
/* toggle between full and tuples-only format */
else if (strcmp(param, "t") == 0 || strcmp(param, "tuples_only") == 0)
{
if (value)
popt->topt.tuples_only = ParseVariableBool(value);
else
popt->topt.tuples_only = !popt->topt.tuples_only;
if (!quiet)
{
if (popt->topt.tuples_only)
puts(_("Showing only tuples."));
else
puts(_("Tuples only is off."));
}
}
/* set title override */
else if (strcmp(param, "title") == 0)
{
free(popt->title);
if (!value)
popt->title = NULL;
else
popt->title = pg_strdup(value);
if (!quiet)
{
if (popt->title)
printf(_("Title is \"%s\".\n"), popt->title);
else
printf(_("Title is unset.\n"));
}
}
/* set HTML table tag options */
else if (strcmp(param, "T") == 0 || strcmp(param, "tableattr") == 0)
{
free(popt->topt.tableAttr);
if (!value)
popt->topt.tableAttr = NULL;
else
popt->topt.tableAttr = pg_strdup(value);
if (!quiet)
{
if (popt->topt.tableAttr)
printf(_("Table attribute is \"%s\".\n"), popt->topt.tableAttr);
else
printf(_("Table attributes unset.\n"));
}
}
/* toggle use of pager */
else if (strcmp(param, "pager") == 0)
{
if (value && pg_strcasecmp(value, "always") == 0)
popt->topt.pager = 2;
else if (value)
if (ParseVariableBool(value))
popt->topt.pager = 1;
else
popt->topt.pager = 0;
else if (popt->topt.pager == 1)
popt->topt.pager = 0;
else
popt->topt.pager = 1;
if (!quiet)
{
if (popt->topt.pager == 1)
puts(_("Pager is used for long output."));
else if (popt->topt.pager == 2)
puts(_("Pager is always used."));
else
puts(_("Pager usage is off."));
}
}
/* disable "(x rows)" footer */
else if (strcmp(param, "footer") == 0)
{
if (value)
popt->default_footer = ParseVariableBool(value);
else
popt->default_footer = !popt->default_footer;
if (!quiet)
{
if (popt->default_footer)
puts(_("Default footer is on."));
else
puts(_("Default footer is off."));
}
}
/* set border style/width */
else if (strcmp(param, "columns") == 0)
{
if (value)
popt->topt.columns = atoi(value);
if (!quiet)
printf(_("Target width for \"wrapped\" format is %d.\n"), popt->topt.columns);
}
else
{
psql_error("\\pset: unknown option: %s\n", param);
return false;
}
return true;
}
