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3243cbc085
This could only cause an issue if strftime returned a ridiculously long timezone name, which seems unlikely; and it wouldn't qualify as a security problem even then, since pg_waldump (nee pg_xlogdump) is a debug tool not part of the server. But gcc 8 has started issuing warnings about it, so let's use snprintf and be safe. Backpatch to 9.3 where this code was added. Discussion: https://postgr.es/m/21789.1529170195@sss.pgh.pa.us
102 lines
2.5 KiB
C
102 lines
2.5 KiB
C
/*-------------------------------------------------------------------------
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*
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* compat.c
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* Reimplementations of various backend functions.
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*
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* Portions Copyright (c) 2013, PostgreSQL Global Development Group
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*
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* IDENTIFICATION
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* contrib/pg_xlogdump/compat.c
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*
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* This file contains client-side implementations for various backend
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* functions that the rm_desc functions in *desc.c files rely on.
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*
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*-------------------------------------------------------------------------
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*/
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/* ugly hack, same as in e.g pg_controldata */
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#define FRONTEND 1
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#include "postgres.h"
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#include <time.h>
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#include "utils/datetime.h"
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#include "lib/stringinfo.h"
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/* copied from timestamp.c */
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pg_time_t
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timestamptz_to_time_t(TimestampTz t)
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{
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pg_time_t result;
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#ifdef HAVE_INT64_TIMESTAMP
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result = (pg_time_t) (t / USECS_PER_SEC +
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((POSTGRES_EPOCH_JDATE - UNIX_EPOCH_JDATE) * SECS_PER_DAY));
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#else
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result = (pg_time_t) (t +
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((POSTGRES_EPOCH_JDATE - UNIX_EPOCH_JDATE) * SECS_PER_DAY));
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#endif
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return result;
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}
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/*
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* Stopgap implementation of timestamptz_to_str that doesn't depend on backend
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* infrastructure. This will work for timestamps that are within the range
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* of the platform time_t type. (pg_time_t is compatible except for possibly
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* being wider.)
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*
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* XXX the return value points to a static buffer, so beware of using more
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* than one result value concurrently.
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*
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* XXX: The backend timestamp infrastructure should instead be split out and
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* moved into src/common. That's a large project though.
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*/
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const char *
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timestamptz_to_str(TimestampTz dt)
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{
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static char buf[MAXDATELEN + 1];
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char ts[MAXDATELEN + 1];
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char zone[MAXDATELEN + 1];
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time_t result = (time_t) timestamptz_to_time_t(dt);
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struct tm *ltime = localtime(&result);
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strftime(ts, sizeof(ts), "%Y-%m-%d %H:%M:%S", ltime);
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strftime(zone, sizeof(zone), "%Z", ltime);
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#ifdef HAVE_INT64_TIMESTAMP
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snprintf(buf, sizeof(buf),
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"%s.%06d %s", ts, (int) (dt % USECS_PER_SEC), zone);
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#else
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snprintf(buf, sizeof(buf),
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"%s.%.6f %s", ts, fabs(dt - floor(dt)), zone);
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#endif
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return buf;
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}
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/*
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* Provide a hacked up compat layer for StringInfos so xlog desc functions can
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* be linked/called.
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*/
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void
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appendStringInfo(StringInfo str, const char *fmt,...)
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{
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va_list args;
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va_start(args, fmt);
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vprintf(fmt, args);
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va_end(args);
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}
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void
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appendStringInfoString(StringInfo str, const char *string)
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{
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appendStringInfo(str, "%s", string);
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}
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void
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appendStringInfoChar(StringInfo str, char ch)
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{
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appendStringInfo(str, "%c", ch);
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}
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