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mirror_smartmontools-debian/utility.cpp
Thomas Lamprecht ff28b140e6 import smartmontools 7.0 
Downloaded source from
https://sourceforge.net/projects/smartmontools/files/smartmontools/7.0/
and imported here to git.

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
2019-06-26 11:05:43 +02:00

871 lines
24 KiB
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/*
* utility.cpp
*
* Home page of code is: http://www.smartmontools.org
*
* Copyright (C) 2002-12 Bruce Allen
* Copyright (C) 2008-18 Christian Franke
* Copyright (C) 2000 Michael Cornwell <cornwell@acm.org>
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
// THIS FILE IS INTENDED FOR UTILITY ROUTINES THAT ARE APPLICABLE TO
// BOTH SCSI AND ATA DEVICES, AND THAT MAY BE USED IN SMARTD,
// SMARTCTL, OR BOTH.
#include "config.h"
#define __STDC_FORMAT_MACROS 1 // enable PRI* for C++
#include <inttypes.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <errno.h>
#include <stdlib.h>
#include <ctype.h>
#include <stdarg.h>
#include <sys/stat.h>
#ifdef HAVE_LOCALE_H
#include <locale.h>
#endif
#ifdef _WIN32
#include <mbstring.h> // _mbsinc()
#endif
#include <stdexcept>
#include "svnversion.h"
#include "utility.h"
#include "atacmds.h"
#include "dev_interface.h"
#include "sg_unaligned.h"
const char * utility_cpp_cvsid = "$Id: utility.cpp 4842 2018-12-02 16:07:26Z chrfranke $"
UTILITY_H_CVSID;
const char * packet_types[] = {
"Direct-access (disk)",
"Sequential-access (tape)",
"Printer",
"Processor",
"Write-once (optical disk)",
"CD/DVD",
"Scanner",
"Optical memory (optical disk)",
"Medium changer",
"Communications",
"Graphic arts pre-press (10)",
"Graphic arts pre-press (11)",
"Array controller",
"Enclosure services",
"Reduced block command (simplified disk)",
"Optical card reader/writer"
};
// BUILD_INFO can be provided by package maintainers
#ifndef BUILD_INFO
#define BUILD_INFO "(local build)"
#endif
// Make version information string
std::string format_version_info(const char * prog_name, bool full /*= false*/)
{
std::string info = strprintf(
"%s " PACKAGE_VERSION " "
#ifdef SMARTMONTOOLS_SVN_REV
SMARTMONTOOLS_SVN_DATE " r" SMARTMONTOOLS_SVN_REV
#else
"(build date " __DATE__ ")" // checkout without expansion of Id keywords
#endif
" [%s] " BUILD_INFO "\n"
"Copyright (C) 2002-18, Bruce Allen, Christian Franke, www.smartmontools.org\n",
prog_name, smi()->get_os_version_str().c_str()
);
if (!full)
return info;
info += "\n";
info += prog_name;
info += " comes with ABSOLUTELY NO WARRANTY. This is free\n"
"software, and you are welcome to redistribute it under\n"
"the terms of the GNU General Public License; either\n"
"version 2, or (at your option) any later version.\n"
"See http://www.gnu.org for further details.\n"
"\n"
"smartmontools release " PACKAGE_VERSION
" dated " SMARTMONTOOLS_RELEASE_DATE " at " SMARTMONTOOLS_RELEASE_TIME "\n"
#ifdef SMARTMONTOOLS_SVN_REV
"smartmontools SVN rev " SMARTMONTOOLS_SVN_REV
" dated " SMARTMONTOOLS_SVN_DATE " at " SMARTMONTOOLS_SVN_TIME "\n"
#else
"smartmontools SVN rev is unknown\n"
#endif
"smartmontools build host: " SMARTMONTOOLS_BUILD_HOST "\n"
"smartmontools build with: "
#define N2S_(s) #s
#define N2S(s) "(" N2S_(s) ")"
#if __cplusplus > 201703
"C++2x" N2S(__cplusplus)
#elif __cplusplus == 201703
"C++17"
#elif __cplusplus > 201402
"C++14" N2S(__cplusplus)
#elif __cplusplus == 201402
"C++14"
#elif __cplusplus > 201103
"C++11" N2S(__cplusplus)
#elif __cplusplus == 201103
"C++11"
#elif __cplusplus > 199711
"C++98" N2S(__cplusplus)
#elif __cplusplus == 199711
"C++98"
#else
"C++" N2S(__cplusplus)
#endif
#undef N2S
#undef N2S_
#if defined(__GNUC__) && defined(__VERSION__) // works also with CLang
", GCC " __VERSION__
#endif
"\n"
"smartmontools configure arguments:"
;
info += (sizeof(SMARTMONTOOLS_CONFIGURE_ARGS) > 1 ?
SMARTMONTOOLS_CONFIGURE_ARGS : " [no arguments given]");
info += '\n';
return info;
}
// Solaris only: Get site-default timezone. This is called from
// UpdateTimezone() when TZ environment variable is unset at startup.
#if defined (__SVR4) && defined (__sun)
static const char *TIMEZONE_FILE = "/etc/TIMEZONE";
static char *ReadSiteDefaultTimezone(){
FILE *fp;
char buf[512], *tz;
int n;
tz = NULL;
fp = fopen(TIMEZONE_FILE, "r");
if(fp == NULL) return NULL;
while(fgets(buf, sizeof(buf), fp)) {
if (strncmp(buf, "TZ=", 3)) // searches last "TZ=" line
continue;
n = strlen(buf) - 1;
if (buf[n] == '\n') buf[n] = 0;
if (tz) free(tz);
tz = strdup(buf);
}
fclose(fp);
return tz;
}
#endif
// Make sure that this executable is aware if the user has changed the
// time-zone since the last time we polled devices. The canonical
// example is a user who starts smartd on a laptop, then flies across
// time-zones with a laptop, and then changes the timezone, WITHOUT
// restarting smartd. This is a work-around for a bug in
// GLIBC. Yuk. See bug number 48184 at http://bugs.debian.org and
// thanks to Ian Redfern for posting a workaround.
// Please refer to the smartd manual page, in the section labeled LOG
// TIMESTAMP TIMEZONE.
void FixGlibcTimeZoneBug(){
#if __GLIBC__
if (!getenv("TZ")) {
putenv((char *)"TZ=GMT"); // POSIX prototype is 'int putenv(char *)'
tzset();
putenv((char *)"TZ");
tzset();
}
#elif _WIN32
if (!getenv("TZ")) {
putenv("TZ=GMT");
tzset();
putenv("TZ="); // empty value removes TZ, putenv("TZ") does nothing
tzset();
}
#elif defined (__SVR4) && defined (__sun)
// In Solaris, putenv("TZ=") sets null string and invalid timezone.
// putenv("TZ") does nothing. With invalid TZ, tzset() do as if
// TZ=GMT. With TZ unset, /etc/TIMEZONE will be read only _once_ at
// first tzset() call. Conclusion: Unlike glibc, dynamic
// configuration of timezone can be done only by changing actual
// value of TZ environment value.
enum tzstate { NOT_CALLED_YET, USER_TIMEZONE, TRACK_TIMEZONE };
static enum tzstate state = NOT_CALLED_YET;
static struct stat prev_stat;
static char *prev_tz;
struct stat curr_stat;
char *curr_tz;
if(state == NOT_CALLED_YET) {
if(getenv("TZ")) {
state = USER_TIMEZONE; // use supplied timezone
} else {
state = TRACK_TIMEZONE;
if(stat(TIMEZONE_FILE, &prev_stat)) {
state = USER_TIMEZONE; // no TZ, no timezone file; use GMT forever
} else {
prev_tz = ReadSiteDefaultTimezone(); // track timezone file change
if(prev_tz) putenv(prev_tz);
}
}
tzset();
} else if(state == TRACK_TIMEZONE) {
if(stat(TIMEZONE_FILE, &curr_stat) == 0
&& (curr_stat.st_ctime != prev_stat.st_ctime
|| curr_stat.st_mtime != prev_stat.st_mtime)) {
// timezone file changed
curr_tz = ReadSiteDefaultTimezone();
if(curr_tz) {
putenv(curr_tz);
if(prev_tz) free(prev_tz);
prev_tz = curr_tz; prev_stat = curr_stat;
}
}
tzset();
}
#endif
// OTHER OS/LIBRARY FIXES SHOULD GO HERE, IF DESIRED. PLEASE TRY TO
// KEEP THEM INDEPENDENT.
return;
}
#ifdef _WIN32
// Fix strings in tzname[] to avoid long names with non-ascii characters.
// If TZ is not set, tzset() in the MSVC runtime sets tzname[] to the
// national language timezone names returned by GetTimezoneInformation().
static char * fixtzname(char * dest, int destsize, const char * src)
{
int i = 0, j = 0;
while (src[i] && j < destsize-1) {
int i2 = (const char *)_mbsinc((const unsigned char *)src+i) - src;
if (i2 > i+1)
i = i2; // Ignore multibyte chars
else {
if ('A' <= src[i] && src[i] <= 'Z')
dest[j++] = src[i]; // "Pacific Standard Time" => "PST"
i++;
}
}
if (j < 2)
j = 0;
dest[j] = 0;
return dest;
}
#endif // _WIN32
// This value follows the peripheral device type value as defined in
// SCSI Primary Commands, ANSI INCITS 301:1997. It is also used in
// the ATA standard for packet devices to define the device type.
const char *packetdevicetype(int type){
if (type<0x10)
return packet_types[type];
if (type<0x20)
return "Reserved";
return "Unknown";
}
// Utility function prints date and time and timezone into a character
// buffer of length 64. All the fuss is needed to get the right
// timezone info (sigh).
void dateandtimezoneepoch(char (& buffer)[DATEANDEPOCHLEN], time_t tval)
{
struct tm *tmval;
const char *timezonename;
char datebuffer[DATEANDEPOCHLEN];
int lenm1;
FixGlibcTimeZoneBug();
// Get the time structure. We need this to determine if we are in
// daylight savings time or not.
tmval=localtime(&tval);
// Convert to an ASCII string, put in datebuffer
// same as: asctime_r(tmval, datebuffer);
strncpy(datebuffer, asctime(tmval), DATEANDEPOCHLEN);
datebuffer[DATEANDEPOCHLEN-1]='\0';
// Remove newline
lenm1=strlen(datebuffer)-1;
datebuffer[lenm1>=0?lenm1:0]='\0';
#if defined(_WIN32) && defined(_MSC_VER)
// tzname is missing in MSVC14
#define tzname _tzname
#endif
// correct timezone name
if (tmval->tm_isdst==0)
// standard time zone
timezonename=tzname[0];
else if (tmval->tm_isdst>0)
// daylight savings in effect
timezonename=tzname[1];
else
// unable to determine if daylight savings in effect
timezonename="";
#ifdef _WIN32
// Fix long non-ascii timezone names
// cppcheck-suppress variableScope
char tzfixbuf[6+1] = "";
if (!getenv("TZ"))
timezonename=fixtzname(tzfixbuf, sizeof(tzfixbuf), timezonename);
#endif
// Finally put the information into the buffer as needed.
snprintf(buffer, DATEANDEPOCHLEN, "%s %s", datebuffer, timezonename);
return;
}
// A replacement for perror() that sends output to our choice of
// printing. If errno not set then just print message.
void syserror(const char *message){
if (errno) {
// Get the correct system error message:
const char *errormessage=strerror(errno);
// Check that caller has handed a sensible string, and provide
// appropriate output. See perrror(3) man page to understand better.
if (message && *message)
pout("%s: %s\n",message, errormessage);
else
pout("%s\n",errormessage);
}
else if (message && *message)
pout("%s\n",message);
return;
}
// Check regular expression for non-portable features.
//
// POSIX extended regular expressions interpret unmatched ')' ordinary:
// "The close-parenthesis shall be considered special in this context
// only if matched with a preceding open-parenthesis."
//
// GNU libc and BSD libc support unmatched ')', Cygwin reports an error.
//
// POSIX extended regular expressions do not define empty subexpressions:
// "A vertical-line appearing first or last in an ERE, or immediately following
// a vertical-line or a left-parenthesis, or immediately preceding a
// right-parenthesis, produces undefined results."
//
// GNU libc and Cygwin support empty subexpressions, BSD libc reports an error.
//
static const char * check_regex(const char * pattern)
{
int level = 0;
char c;
for (int i = 0; (c = pattern[i]); i++) {
// Skip "\x"
if (c == '\\') {
if (!pattern[++i])
break;
continue;
}
// Skip "[...]"
if (c == '[') {
if (pattern[++i] == '^')
i++;
if (!pattern[i++])
break;
while ((c = pattern[i]) && c != ']')
i++;
if (!c)
break;
continue;
}
// Check "(...)" nesting
if (c == '(')
level++;
else if (c == ')' && --level < 0)
return "Unmatched ')'";
// Check for leading/trailing '|' or "||", "|)", "|$", "(|", "^|"
char c1;
if ( (c == '|' && ( i == 0 || !(c1 = pattern[i+1])
|| c1 == '|' || c1 == ')' || c1 == '$'))
|| ((c == '(' || c == '^') && pattern[i+1] == '|') )
return "Empty '|' subexpression";
}
return (const char *)0;
}
// Wrapper class for POSIX regex(3) or std::regex
#ifndef WITH_CXX11_REGEX
regular_expression::regular_expression()
{
memset(&m_regex_buf, 0, sizeof(m_regex_buf));
}
regular_expression::~regular_expression()
{
free_buf();
}
regular_expression::regular_expression(const regular_expression & x)
: m_pattern(x.m_pattern),
m_errmsg(x.m_errmsg)
{
memset(&m_regex_buf, 0, sizeof(m_regex_buf));
copy_buf(x);
}
regular_expression & regular_expression::operator=(const regular_expression & x)
{
m_pattern = x.m_pattern;
m_errmsg = x.m_errmsg;
free_buf();
copy_buf(x);
return *this;
}
void regular_expression::free_buf()
{
if (nonempty(&m_regex_buf, sizeof(m_regex_buf))) {
regfree(&m_regex_buf);
memset(&m_regex_buf, 0, sizeof(m_regex_buf));
}
}
void regular_expression::copy_buf(const regular_expression & x)
{
if (nonempty(&x.m_regex_buf, sizeof(x.m_regex_buf))) {
// There is no POSIX compiled-regex-copy command.
if (!compile())
throw std::runtime_error(strprintf(
"Unable to recompile regular expression \"%s\": %s",
m_pattern.c_str(), m_errmsg.c_str()));
}
}
#endif // !WITH_CXX11_REGEX
regular_expression::regular_expression(const char * pattern)
: m_pattern(pattern)
{
if (!compile())
throw std::runtime_error(strprintf(
"error in regular expression \"%s\": %s",
m_pattern.c_str(), m_errmsg.c_str()));
}
bool regular_expression::compile(const char * pattern)
{
#ifndef WITH_CXX11_REGEX
free_buf();
#endif
m_pattern = pattern;
return compile();
}
bool regular_expression::compile()
{
#ifdef WITH_CXX11_REGEX
try {
m_regex.assign(m_pattern, std::regex_constants::extended);
}
catch (std::regex_error & ex) {
m_errmsg = ex.what();
return false;
}
#else
int errcode = regcomp(&m_regex_buf, m_pattern.c_str(), REG_EXTENDED);
if (errcode) {
char errmsg[512];
regerror(errcode, &m_regex_buf, errmsg, sizeof(errmsg));
m_errmsg = errmsg;
free_buf();
return false;
}
#endif
const char * errmsg = check_regex(m_pattern.c_str());
if (errmsg) {
m_errmsg = errmsg;
#ifdef WITH_CXX11_REGEX
m_regex = std::regex();
#else
free_buf();
#endif
return false;
}
m_errmsg.clear();
return true;
}
bool regular_expression::full_match(const char * str) const
{
#ifdef WITH_CXX11_REGEX
return std::regex_match(str, m_regex);
#else
match_range range;
return ( !regexec(&m_regex_buf, str, 1, &range, 0)
&& range.rm_so == 0 && range.rm_eo == (int)strlen(str));
#endif
}
bool regular_expression::execute(const char * str, unsigned nmatch, match_range * pmatch) const
{
#ifdef WITH_CXX11_REGEX
std::cmatch m;
if (!std::regex_search(str, m, m_regex))
return false;
unsigned sz = m.size();
for (unsigned i = 0; i < nmatch; i++) {
if (i < sz && *m[i].first) {
pmatch[i].rm_so = m[i].first - str;
pmatch[i].rm_eo = m[i].second - str;
}
else
pmatch[i].rm_so = pmatch[i].rm_eo = -1;
}
return true;
#else
return !regexec(&m_regex_buf, str, nmatch, pmatch, 0);
#endif
}
// Splits an argument to the -t option that is assumed to be of the form
// "selective,%lld-%lld" (prefixes of "0" (for octal) and "0x"/"0X" (for hex)
// are allowed). The first long long int is assigned to *start and the second
// to *stop. Returns zero if successful and non-zero otherwise.
int split_selective_arg(char *s, uint64_t *start,
uint64_t *stop, int *mode)
{
char *tailptr;
if (!(s = strchr(s, ',')))
return 1;
bool add = false;
if (!isdigit((int)(*++s))) {
*start = *stop = 0;
if (!strncmp(s, "redo", 4))
*mode = SEL_REDO;
else if (!strncmp(s, "next", 4))
*mode = SEL_NEXT;
else if (!strncmp(s, "cont", 4))
*mode = SEL_CONT;
else
return 1;
s += 4;
if (!*s)
return 0;
if (*s != '+')
return 1;
}
else {
*mode = SEL_RANGE;
errno = 0;
// Last argument to strtoull (the base) is 0 meaning that decimal is assumed
// unless prefixes of "0" (for octal) or "0x"/"0X" (for hex) are used.
*start = strtoull(s, &tailptr, 0);
s = tailptr;
add = (*s == '+');
if (!(!errno && (add || *s == '-')))
return 1;
if (!strcmp(s, "-max")) {
*stop = ~(uint64_t)0; // replaced by max LBA later
return 0;
}
}
errno = 0;
*stop = strtoull(s+1, &tailptr, 0);
if (errno || *tailptr != '\0')
return 1;
if (add) {
if (*stop > 0)
(*stop)--;
*stop += *start; // -t select,N+M => -t select,N,(N+M-1)
}
return 0;
}
// Returns true if region of memory contains non-zero entries
bool nonempty(const void * data, int size)
{
for (int i = 0; i < size; i++)
if (((const unsigned char *)data)[i])
return true;
return false;
}
// Copy not null terminated char array to null terminated string.
// Replace non-ascii characters. Remove leading and trailing blanks.
const char * format_char_array(char * str, int strsize, const char * chr, int chrsize)
{
int b = 0;
while (b < chrsize && chr[b] == ' ')
b++;
int n = 0;
while (b+n < chrsize && chr[b+n])
n++;
while (n > 0 && chr[b+n-1] == ' ')
n--;
if (n >= strsize)
n = strsize-1;
for (int i = 0; i < n; i++) {
char c = chr[b+i];
str[i] = (' ' <= c && c <= '~' ? c : '?');
}
str[n] = 0;
return str;
}
// Format integer with thousands separator
const char * format_with_thousands_sep(char * str, int strsize, uint64_t val,
const char * thousands_sep /* = 0 */)
{
if (!thousands_sep) {
thousands_sep = ",";
#ifdef HAVE_LOCALE_H
setlocale(LC_ALL, "");
const struct lconv * currentlocale = localeconv();
if (*(currentlocale->thousands_sep))
thousands_sep = currentlocale->thousands_sep;
#endif
}
char num[64];
snprintf(num, sizeof(num), "%" PRIu64, val);
int numlen = strlen(num);
int i = 0, j = 0;
do
str[j++] = num[i++];
while (i < numlen && (numlen - i) % 3 != 0 && j < strsize-1);
str[j] = 0;
while (i < numlen && j < strsize-1) {
j += snprintf(str+j, strsize-j, "%s%.3s", thousands_sep, num+i);
i += 3;
}
return str;
}
// Format capacity with SI prefixes
const char * format_capacity(char * str, int strsize, uint64_t val,
const char * decimal_point /* = 0 */)
{
if (!decimal_point) {
decimal_point = ".";
#ifdef HAVE_LOCALE_H
setlocale(LC_ALL, "");
const struct lconv * currentlocale = localeconv();
if (*(currentlocale->decimal_point))
decimal_point = currentlocale->decimal_point;
#endif
}
const unsigned factor = 1000; // 1024 for KiB,MiB,...
static const char prefixes[] = " KMGTP";
// Find d with val in [d, d*factor)
unsigned i = 0;
uint64_t d = 1;
for (uint64_t d2 = d * factor; val >= d2; d2 *= factor) {
d = d2;
if (++i >= sizeof(prefixes)-2)
break;
}
// Print 3 digits
uint64_t n = val / d;
if (i == 0)
snprintf(str, strsize, "%u B", (unsigned)n);
else if (n >= 100) // "123 xB"
snprintf(str, strsize, "%" PRIu64 " %cB", n, prefixes[i]);
else if (n >= 10) // "12.3 xB"
snprintf(str, strsize, "%" PRIu64 "%s%u %cB", n, decimal_point,
(unsigned)(((val % d) * 10) / d), prefixes[i]);
else // "1.23 xB"
snprintf(str, strsize, "%" PRIu64 "%s%02u %cB", n, decimal_point,
(unsigned)(((val % d) * 100) / d), prefixes[i]);
return str;
}
// return (v)sprintf() formatted std::string
__attribute_format_printf(1, 0)
std::string vstrprintf(const char * fmt, va_list ap)
{
char buf[512];
vsnprintf(buf, sizeof(buf), fmt, ap);
buf[sizeof(buf)-1] = 0;
return buf;
}
std::string strprintf(const char * fmt, ...)
{
va_list ap; va_start(ap, fmt);
std::string str = vstrprintf(fmt, ap);
va_end(ap);
return str;
}
#if defined(HAVE___INT128)
// Compiler supports '__int128'.
// Recursive 128-bit to string conversion function
static int snprint_uint128(char * str, int strsize, unsigned __int128 value)
{
if (strsize <= 0)
return -1;
if (value <= 0xffffffffffffffffULL) {
// Print leading digits as 64-bit value
return snprintf(str, (size_t)strsize, "%" PRIu64, (uint64_t)value);
}
else {
// Recurse to print leading digits
const uint64_t e19 = 10000000000000000000ULL; // 2^63 < 10^19 < 2^64
int len1 = snprint_uint128(str, strsize, value / e19);
if (len1 < 0)
return -1;
// Print 19 digits remainder as 64-bit value
int len2 = snprintf(str + (len1 < strsize ? len1 : strsize - 1),
(size_t)(len1 < strsize ? strsize - len1 : 1),
"%019" PRIu64, (uint64_t)(value % e19) );
if (len2 < 0)
return -1;
return len1 + len2;
}
}
// Convert 128-bit unsigned integer provided as two 64-bit halves to a string.
const char * uint128_hilo_to_str(char * str, int strsize, uint64_t value_hi, uint64_t value_lo)
{
snprint_uint128(str, strsize, ((unsigned __int128)value_hi << 64) | value_lo);
return str;
}
#elif defined(HAVE_LONG_DOUBLE_WIDER_PRINTF)
// Compiler and *printf() support 'long double' which is wider than 'double'.
const char * uint128_hilo_to_str(char * str, int strsize, uint64_t value_hi, uint64_t value_lo)
{
snprintf(str, strsize, "%.0Lf", value_hi * (0xffffffffffffffffULL + 1.0L) + value_lo);
return str;
}
#else // !HAVE_LONG_DOUBLE_WIDER_PRINTF
// No '__int128' or 'long double' support, use 'double'.
const char * uint128_hilo_to_str(char * str, int strsize, uint64_t value_hi, uint64_t value_lo)
{
snprintf(str, strsize, "%.0f", value_hi * (0xffffffffffffffffULL + 1.0) + value_lo);
return str;
}
#endif // HAVE___INT128
// Runtime check of byte ordering, throws on error.
static void check_endianness()
{
const union {
// Force compile error if int type is not 32bit.
unsigned char c[sizeof(int) == 4 ? 8 : -1];
uint64_t i;
} x = {{1, 2, 3, 4, 5, 6, 7, 8}};
const uint64_t le = 0x0807060504030201ULL;
const uint64_t be = 0x0102030405060708ULL;
if (!( x.i == (isbigendian() ? be : le)
&& sg_get_unaligned_le16(x.c) == (uint16_t)le
&& sg_get_unaligned_be16(x.c+6) == (uint16_t)be
&& sg_get_unaligned_le32(x.c) == (uint32_t)le
&& sg_get_unaligned_be32(x.c+4) == (uint32_t)be
&& sg_get_unaligned_le64(x.c) == le
&& sg_get_unaligned_be64(x.c) == be ))
throw std::logic_error("CPU endianness does not match compile time test");
}
#ifndef HAVE_WORKING_SNPRINTF
// Some versions of (v)snprintf() don't append null char (MSVCRT.DLL),
// and/or return -1 on output truncation (glibc <= 2.0.6).
// Below are sane replacements substituted by #define in utility.h.
#undef vsnprintf
#if defined(_WIN32) && defined(_MSC_VER)
#define vsnprintf _vsnprintf
#endif
int safe_vsnprintf(char *buf, int size, const char *fmt, va_list ap)
{
int i;
if (size <= 0)
return 0;
i = vsnprintf(buf, size, fmt, ap);
if (0 <= i && i < size)
return i;
buf[size-1] = 0;
return strlen(buf); // Note: cannot detect for overflow, not necessary here.
}
int safe_snprintf(char *buf, int size, const char *fmt, ...)
{
int i; va_list ap;
va_start(ap, fmt);
i = safe_vsnprintf(buf, size, fmt, ap);
va_end(ap);
return i;
}
static void check_snprintf() {}
#elif defined(__GNUC__) && (__GNUC__ >= 7)
// G++ 7+: Assume sane implementation and avoid -Wformat-truncation warning
static void check_snprintf() {}
#else
static void check_snprintf()
{
char buf[] = "ABCDEFGHI";
int n1 = snprintf(buf, 8, "123456789");
int n2 = snprintf(buf, 0, "X");
if (!(!strcmp(buf, "1234567") && n1 == 9 && n2 == 1))
throw std::logic_error("Function snprintf() does not conform to C99");
}
#endif // HAVE_WORKING_SNPRINTF
// Runtime check of ./configure result, throws on error.
void check_config()
{
check_endianness();
check_snprintf();
}
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