psprintf.c File Reference

#include "postgres.h"
#include "utils/memutils.h"

Include dependency graph for psprintf.c:

Go to the source code of this file.

Functions
char *	psprintf (const char *fmt,...)
size_t	pvsnprintf (char *buf, size_t len, const char *fmt, va_list args)

Function Documentation

psprintf()

char* psprintf	(	const char *	fmt,
			...
	)

Definition at line 46 of file psprintf.c.

References generate_unaccent_rules::args, palloc(), pfree(), and pvsnprintf().

Referenced by _mdfd_segpath(), anytime_typmodout(), anytimestamp_typmodout(), auth_failed(), AuxiliaryProcessMain(), BaseBackup(), brin_desummarize_range(), brin_metapage_info(), brin_page_type(), brin_summarize_range(), bt_metap(), bt_page_print_tuples(), bt_page_stats(), bt_target_page_check(), build_function_result_tupdesc_d(), build_server_final_message(), build_server_first_message(), cash_out(), cfopen_read(), cfopen_write(), CheckSCRAMAuth(), complex_out(), create_script_for_cluster_analyze(), create_script_for_old_cluster_deletion(), create_tablespace_directories(), create_xlog_or_symlink(), datasegpath(), dblink_get_pkey(), defGetString(), describeOneTableDetails(), destroy_tablespace_directories(), do_shell(), do_to_timestamp(), doputenv(), dumpAttrDef(), dumpConstraint(), dumpPolicy(), dumpPublicationTable(), dumpRule(), dumpTrigger(), editFile(), exec_command_setenv(), expand_dynamic_library_name(), expand_tilde(), ExplainNode(), ExplainPropertyFloat(), fetch_finfo_record(), float4_to_char(), float8_to_char(), format_type_extended(), get_role_password(), get_user_name(), GetDatabasePath(), getFormattedOperatorName(), gethba_options(), getObjectIdentityParts(), GetRelationPath(), GUCArrayAdd(), HandleParallelMessage(), helpSQL(), ident_inet(), initialize_data_directory(), initialize_environment(), initializeInput(), int4_to_char(), line_out(), llvm_compile_module(), llvm_expand_funcname(), llvm_function_reference(), load_libraries(), log_line_prefix(), logicalrep_typmap_gettypname(), LogicalRepSyncTableStart(), main(), md5_crypt_verify(), parse_hba_auth_opt(), parse_hba_line(), parseCommandLine(), perform_base_backup(), pg_be_scram_init(), pg_control_checkpoint(), pg_get_multixact_members(), pg_import_system_collations(), pg_logdir_ls_internal(), pg_putenv(), pg_size_pretty_numeric(), pg_tablespace_databases(), pgstatindex_impl(), plain_crypt_verify(), printTypmod(), process_psqlrc_file(), ProcessStartupPacket(), prompt_for_password(), pset_value_string(), psql_start_test(), readCommandResponse(), sequence_options(), set_input(), set_null_conf(), set_tablespace_directory_suffix(), setup_pgdata(), spawn_process(), sql_exec_searchtables(), SS_make_initplan_from_plan(), SS_process_ctes(), StartLogStreamer(), StartupXLOG(), StoreQueryTuple(), substitute_libpath_macro(), tokenize_file(), tokenize_inc_file(), TransactionIdInRecentPast(), try_complete_step(), typenameTypeMod(), widget_out(), write_version_file(), XLogDumpDisplayRecord(), XLogDumpDisplayStats(), and xstrcat().

{
    int         save_errno = errno;
    size_t      len = 128;      /* initial assumption about buffer size */

    for (;;)
    {
        char       *result;
        va_list     args;
        size_t      newlen;

        /*
         * Allocate result buffer.  Note that in frontend this maps to malloc
         * with exit-on-error.
         */
        result = (char *) palloc(len);

        /* Try to format the data. */
        errno = save_errno;
        va_start(args, fmt);
        newlen = pvsnprintf(result, len, fmt, args);
        va_end(args);

        if (newlen < len)
            return result;      /* success */

        /* Release buffer and loop around to try again with larger len. */
        pfree(result);
        len = newlen;
    }
}

pvsnprintf()

size_t pvsnprintf	(	char *	buf,
		size_t	len,
		const char *	fmt,
		va_list	args
	)

Definition at line 106 of file psprintf.c.

References _, elog, ereport, errcode(), errmsg(), ERROR, EXIT_FAILURE, fprintf, MaxAllocSize, strerror, unlikely, and vsnprintf.

Referenced by ahprintf(), appendStringInfoVA(), archprintf(), psprintf(), and tarPrintf().

{
    int         nprinted;

    nprinted = vsnprintf(buf, len, fmt, args);

    /* We assume failure means the fmt is bogus, hence hard failure is OK */
    if (unlikely(nprinted < 0))
    {
#ifndef FRONTEND
        elog(ERROR, "vsnprintf failed: %m with format string \"%s\"", fmt);
#else
        fprintf(stderr, "vsnprintf failed: %s with format string \"%s\"\n",
                strerror(errno), fmt);
        exit(EXIT_FAILURE);
#endif
    }

    if ((size_t) nprinted < len)
    {
        /* Success.  Note nprinted does not include trailing null. */
        return (size_t) nprinted;
    }

    /*
     * We assume a C99-compliant vsnprintf, so believe its estimate of the
     * required space, and add one for the trailing null.  (If it's wrong, the
     * logic will still work, but we may loop multiple times.)
     *
     * Choke if the required space would exceed MaxAllocSize.  Note we use
     * this palloc-oriented overflow limit even when in frontend.
     */
    if (unlikely((size_t) nprinted > MaxAllocSize - 1))
    {
#ifndef FRONTEND
        ereport(ERROR,
                (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
                 errmsg("out of memory")));
#else
        fprintf(stderr, _("out of memory\n"));
        exit(EXIT_FAILURE);
#endif
    }

    return nprinted + 1;
}