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zic.c
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/*
** This file is in the public domain, so clarified as of
** 2006-07-17 by Arthur David Olson.
*/
#include "version.h"
#include "private.h"
#include "tzfile.h"
#include <fcntl.h>
#include <locale.h>
#include <stdarg.h>
#include <stddef.h>
#define ZIC_VERSION_PRE_2013 '2'
#define ZIC_VERSION '3'
typedef int_fast64_t zic_t;
#define ZIC_MIN INT_FAST64_MIN
#define ZIC_MAX INT_FAST64_MAX
#define PRIdZIC PRIdFAST64
#define SCNdZIC SCNdFAST64
#ifndef ZIC_MAX_ABBR_LEN_WO_WARN
#define ZIC_MAX_ABBR_LEN_WO_WARN 6
#endif /* !defined ZIC_MAX_ABBR_LEN_WO_WARN */
#ifdef HAVE_DIRECT_H
# include <direct.h>
# include <io.h>
# undef mkdir
# define mkdir(name, mode) _mkdir(name)
#endif
#if HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#ifdef S_IRUSR
#define MKDIR_UMASK (S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH)
#else
#define MKDIR_UMASK 0755
#endif
/* The maximum ptrdiff_t value, for pre-C99 platforms. */
#ifndef PTRDIFF_MAX
static ptrdiff_t const PTRDIFF_MAX = MAXVAL(ptrdiff_t, TYPE_BIT(ptrdiff_t));
#endif
/* The type for line numbers. Use PRIdMAX to format them; formerly
there was also "#define PRIdLINENO PRIdMAX" and formats used
PRIdLINENO, but xgettext cannot grok that. */
typedef intmax_t lineno;
struct rule {
const char * r_filename;
lineno r_linenum;
const char * r_name;
zic_t r_loyear; /* for example, 1986 */
zic_t r_hiyear; /* for example, 1986 */
const char * r_yrtype;
bool r_lowasnum;
bool r_hiwasnum;
int r_month; /* 0..11 */
int r_dycode; /* see below */
int r_dayofmonth;
int r_wday;
zic_t r_tod; /* time from midnight */
bool r_todisstd; /* above is standard time if 1 */
/* or wall clock time if 0 */
bool r_todisgmt; /* above is GMT if 1 */
/* or local time if 0 */
zic_t r_stdoff; /* offset from standard time */
const char * r_abbrvar; /* variable part of abbreviation */
bool r_todo; /* a rule to do (used in outzone) */
zic_t r_temp; /* used in outzone */
};
/*
** r_dycode r_dayofmonth r_wday
*/
#define DC_DOM 0 /* 1..31 */ /* unused */
#define DC_DOWGEQ 1 /* 1..31 */ /* 0..6 (Sun..Sat) */
#define DC_DOWLEQ 2 /* 1..31 */ /* 0..6 (Sun..Sat) */
struct zone {
const char * z_filename;
lineno z_linenum;
const char * z_name;
zic_t z_gmtoff;
const char * z_rule;
const char * z_format;
char z_format_specifier;
zic_t z_stdoff;
struct rule * z_rules;
ptrdiff_t z_nrules;
struct rule z_untilrule;
zic_t z_untiltime;
};
#if !HAVE_POSIX_DECLS
extern int getopt(int argc, char * const argv[],
const char * options);
extern int link(const char * fromname, const char * toname);
extern char * optarg;
extern int optind;
#endif
#if ! HAVE_LINK
# define link(from, to) (errno = ENOTSUP, -1)
#endif
#if ! HAVE_SYMLINK
# define readlink(file, buf, size) (errno = ENOTSUP, -1)
# define symlink(from, to) (errno = ENOTSUP, -1)
# define S_ISLNK(m) 0
#endif
#ifndef AT_SYMLINK_FOLLOW
# define linkat(fromdir, from, todir, to, flag) \
(itssymlink(from) ? (errno = ENOTSUP, -1) : link(from, to))
#endif
static void addtt(zic_t starttime, int type);
static int addtype(zic_t, char const *, bool, bool, bool);
static void leapadd(zic_t, bool, int, int);
static void adjleap(void);
static void associate(void);
static void dolink(const char *, const char *, bool);
static char ** getfields(char * buf);
static zic_t gethms(const char * string, const char * errstring,
bool);
static void infile(const char * filename);
static void inleap(char ** fields, int nfields);
static void inlink(char ** fields, int nfields);
static void inrule(char ** fields, int nfields);
static bool inzcont(char ** fields, int nfields);
static bool inzone(char ** fields, int nfields);
static bool inzsub(char **, int, bool);
static bool itsdir(char const *);
static bool itssymlink(char const *);
static bool is_alpha(char a);
static char lowerit(char);
static void mkdirs(char const *, bool);
static void newabbr(const char * abbr);
static zic_t oadd(zic_t t1, zic_t t2);
static void outzone(const struct zone * zp, ptrdiff_t ntzones);
static zic_t rpytime(const struct rule * rp, zic_t wantedy);
static void rulesub(struct rule * rp,
const char * loyearp, const char * hiyearp,
const char * typep, const char * monthp,
const char * dayp, const char * timep);
static zic_t tadd(zic_t t1, zic_t t2);
static bool yearistype(zic_t year, const char * type);
/* Bound on length of what %z can expand to. */
enum { PERCENT_Z_LEN_BOUND = sizeof "+995959" - 1 };
/* If true, work around a bug in Qt 5.6.1 and earlier, which mishandles
tz binary files whose POSIX-TZ-style strings contain '<'; see
QTBUG-53071 <https://bugreports.qt.io/browse/QTBUG-53071>. This
workaround will no longer be needed when Qt 5.6.1 and earlier are
obsolete, say in the year 2021. */
enum { WORK_AROUND_QTBUG_53071 = true };
static int charcnt;
static bool errors;
static bool warnings;
static const char * filename;
static int leapcnt;
static bool leapseen;
static zic_t leapminyear;
static zic_t leapmaxyear;
static lineno linenum;
static int max_abbrvar_len = PERCENT_Z_LEN_BOUND;
static int max_format_len;
static zic_t max_year;
static zic_t min_year;
static bool noise;
static const char * rfilename;
static lineno rlinenum;
static const char * progname;
static ptrdiff_t timecnt;
static ptrdiff_t timecnt_alloc;
static int typecnt;
/*
** Line codes.
*/
#define LC_RULE 0
#define LC_ZONE 1
#define LC_LINK 2
#define LC_LEAP 3
/*
** Which fields are which on a Zone line.
*/
#define ZF_NAME 1
#define ZF_GMTOFF 2
#define ZF_RULE 3
#define ZF_FORMAT 4
#define ZF_TILYEAR 5
#define ZF_TILMONTH 6
#define ZF_TILDAY 7
#define ZF_TILTIME 8
#define ZONE_MINFIELDS 5
#define ZONE_MAXFIELDS 9
/*
** Which fields are which on a Zone continuation line.
*/
#define ZFC_GMTOFF 0
#define ZFC_RULE 1
#define ZFC_FORMAT 2
#define ZFC_TILYEAR 3
#define ZFC_TILMONTH 4
#define ZFC_TILDAY 5
#define ZFC_TILTIME 6
#define ZONEC_MINFIELDS 3
#define ZONEC_MAXFIELDS 7
/*
** Which files are which on a Rule line.
*/
#define RF_NAME 1
#define RF_LOYEAR 2
#define RF_HIYEAR 3
#define RF_COMMAND 4
#define RF_MONTH 5
#define RF_DAY 6
#define RF_TOD 7
#define RF_STDOFF 8
#define RF_ABBRVAR 9
#define RULE_FIELDS 10
/*
** Which fields are which on a Link line.
*/
#define LF_FROM 1
#define LF_TO 2
#define LINK_FIELDS 3
/*
** Which fields are which on a Leap line.
*/
#define LP_YEAR 1
#define LP_MONTH 2
#define LP_DAY 3
#define LP_TIME 4
#define LP_CORR 5
#define LP_ROLL 6
#define LEAP_FIELDS 7
/*
** Year synonyms.
*/
#define YR_MINIMUM 0
#define YR_MAXIMUM 1
#define YR_ONLY 2
static struct rule * rules;
static ptrdiff_t nrules; /* number of rules */
static ptrdiff_t nrules_alloc;
static struct zone * zones;
static ptrdiff_t nzones; /* number of zones */
static ptrdiff_t nzones_alloc;
struct link {
const char * l_filename;
lineno l_linenum;
const char * l_from;
const char * l_to;
};
static struct link * links;
static ptrdiff_t nlinks;
static ptrdiff_t nlinks_alloc;
struct lookup {
const char * l_word;
const int l_value;
};
static struct lookup const * byword(const char * string,
const struct lookup * lp);
static struct lookup const line_codes[] = {
{ "Rule", LC_RULE },
{ "Zone", LC_ZONE },
{ "Link", LC_LINK },
{ "Leap", LC_LEAP },
{ NULL, 0}
};
static struct lookup const mon_names[] = {
{ "January", TM_JANUARY },
{ "February", TM_FEBRUARY },
{ "March", TM_MARCH },
{ "April", TM_APRIL },
{ "May", TM_MAY },
{ "June", TM_JUNE },
{ "July", TM_JULY },
{ "August", TM_AUGUST },
{ "September", TM_SEPTEMBER },
{ "October", TM_OCTOBER },
{ "November", TM_NOVEMBER },
{ "December", TM_DECEMBER },
{ NULL, 0 }
};
static struct lookup const wday_names[] = {
{ "Sunday", TM_SUNDAY },
{ "Monday", TM_MONDAY },
{ "Tuesday", TM_TUESDAY },
{ "Wednesday", TM_WEDNESDAY },
{ "Thursday", TM_THURSDAY },
{ "Friday", TM_FRIDAY },
{ "Saturday", TM_SATURDAY },
{ NULL, 0 }
};
static struct lookup const lasts[] = {
{ "last-Sunday", TM_SUNDAY },
{ "last-Monday", TM_MONDAY },
{ "last-Tuesday", TM_TUESDAY },
{ "last-Wednesday", TM_WEDNESDAY },
{ "last-Thursday", TM_THURSDAY },
{ "last-Friday", TM_FRIDAY },
{ "last-Saturday", TM_SATURDAY },
{ NULL, 0 }
};
static struct lookup const begin_years[] = {
{ "minimum", YR_MINIMUM },
{ "maximum", YR_MAXIMUM },
{ NULL, 0 }
};
static struct lookup const end_years[] = {
{ "minimum", YR_MINIMUM },
{ "maximum", YR_MAXIMUM },
{ "only", YR_ONLY },
{ NULL, 0 }
};
static struct lookup const leap_types[] = {
{ "Rolling", true },
{ "Stationary", false },
{ NULL, 0 }
};
static const int len_months[2][MONSPERYEAR] = {
{ 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
{ 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
};
static const int len_years[2] = {
DAYSPERNYEAR, DAYSPERLYEAR
};
static struct attype {
zic_t at;
bool dontmerge;
unsigned char type;
} * attypes;
static zic_t gmtoffs[TZ_MAX_TYPES];
static char isdsts[TZ_MAX_TYPES];
static unsigned char abbrinds[TZ_MAX_TYPES];
static bool ttisstds[TZ_MAX_TYPES];
static bool ttisgmts[TZ_MAX_TYPES];
static char chars[TZ_MAX_CHARS];
static zic_t trans[TZ_MAX_LEAPS];
static zic_t corr[TZ_MAX_LEAPS];
static char roll[TZ_MAX_LEAPS];
/*
** Memory allocation.
*/
static _Noreturn void
memory_exhausted(const char *msg)
{
fprintf(stderr, _("%s: Memory exhausted: %s\n"), progname, msg);
exit(EXIT_FAILURE);
}
static ATTRIBUTE_PURE size_t
size_product(size_t nitems, size_t itemsize)
{
if (SIZE_MAX / itemsize < nitems)
memory_exhausted(_("size overflow"));
return nitems * itemsize;
}
#if !HAVE_STRDUP
static char *
strdup(char const *str)
{
char *result = malloc(strlen(str) + 1);
return result ? strcpy(result, str) : result;
}
#endif
static ATTRIBUTE_PURE void *
memcheck(void *ptr)
{
if (ptr == NULL)
memory_exhausted(strerror(errno));
return ptr;
}
static void *
emalloc(size_t size)
{
return memcheck(malloc(size));
}
static void *
erealloc(void *ptr, size_t size)
{
return memcheck(realloc(ptr, size));
}
static char *
ecpyalloc (char const *str)
{
return memcheck(strdup(str));
}
static void *
growalloc(void *ptr, size_t itemsize, ptrdiff_t nitems, ptrdiff_t *nitems_alloc)
{
if (nitems < *nitems_alloc)
return ptr;
else {
ptrdiff_t nitems_max = PTRDIFF_MAX - WORK_AROUND_QTBUG_53071;
ptrdiff_t amax = nitems_max < SIZE_MAX ? nitems_max : SIZE_MAX;
if ((amax - 1) / 3 * 2 < *nitems_alloc)
memory_exhausted(_("integer overflow"));
*nitems_alloc += (*nitems_alloc >> 1) + 1;
return erealloc(ptr, size_product(*nitems_alloc, itemsize));
}
}
/*
** Error handling.
*/
static void
eats(char const *name, lineno num, char const *rname, lineno rnum)
{
filename = name;
linenum = num;
rfilename = rname;
rlinenum = rnum;
}
static void
eat(char const *name, lineno num)
{
eats(name, num, NULL, -1);
}
static void ATTRIBUTE_FORMAT((printf, 1, 0))
verror(const char *const string, va_list args)
{
/*
** Match the format of "cc" to allow sh users to
** zic ... 2>&1 | error -t "*" -v
** on BSD systems.
*/
if (filename)
fprintf(stderr, _("\"%s\", line %"PRIdMAX": "), filename, linenum);
vfprintf(stderr, string, args);
if (rfilename != NULL)
fprintf(stderr, _(" (rule from \"%s\", line %"PRIdMAX")"),
rfilename, rlinenum);
fprintf(stderr, "\n");
}
static void ATTRIBUTE_FORMAT((printf, 1, 2))
error(const char *const string, ...)
{
va_list args;
va_start(args, string);
verror(string, args);
va_end(args);
errors = true;
}
static void ATTRIBUTE_FORMAT((printf, 1, 2))
warning(const char *const string, ...)
{
va_list args;
fprintf(stderr, _("warning: "));
va_start(args, string);
verror(string, args);
va_end(args);
warnings = true;
}
static void
close_file(FILE *stream, char const *dir, char const *name)
{
char const *e = (ferror(stream) ? _("I/O error")
: fclose(stream) != 0 ? strerror(errno) : NULL);
if (e) {
fprintf(stderr, "%s: %s%s%s%s%s\n", progname,
dir ? dir : "", dir ? "/" : "",
name ? name : "", name ? ": " : "",
e);
exit(EXIT_FAILURE);
}
}
static _Noreturn void
usage(FILE *stream, int status)
{
fprintf(stream,
_("%s: usage is %s [ --version ] [ --help ] [ -v ] \\\n"
"\t[ -l localtime ] [ -p posixrules ] [ -d directory ] \\\n"
"\t[ -L leapseconds ] [ filename ... ]\n\n"
"Report bugs to %s.\n"),
progname, progname, REPORT_BUGS_TO);
if (status == EXIT_SUCCESS)
close_file(stream, NULL, NULL);
exit(status);
}
/* Change the working directory to DIR, possibly creating DIR and its
ancestors. After this is done, all files are accessed with names
relative to DIR. */
static void
change_directory (char const *dir)
{
if (chdir(dir) != 0) {
int chdir_errno = errno;
if (chdir_errno == ENOENT) {
mkdirs(dir, false);
chdir_errno = chdir(dir) == 0 ? 0 : errno;
}
if (chdir_errno != 0) {
fprintf(stderr, _("%s: Can't chdir to %s: %s\n"),
progname, dir, strerror(chdir_errno));
exit(EXIT_FAILURE);
}
}
}
static const char * psxrules;
static const char * lcltime;
static const char * directory;
static const char * leapsec;
static const char * yitcommand;
int
main(int argc, char **argv)
{
register int c, k;
register ptrdiff_t i, j;
#ifdef S_IWGRP
umask(umask(S_IWGRP | S_IWOTH) | (S_IWGRP | S_IWOTH));
#endif
#if HAVE_GETTEXT
setlocale(LC_ALL, "");
#ifdef TZ_DOMAINDIR
bindtextdomain(TZ_DOMAIN, TZ_DOMAINDIR);
#endif /* defined TEXTDOMAINDIR */
textdomain(TZ_DOMAIN);
#endif /* HAVE_GETTEXT */
progname = argv[0];
if (TYPE_BIT(zic_t) < 64) {
fprintf(stderr, "%s: %s\n", progname,
_("wild compilation-time specification of zic_t"));
return EXIT_FAILURE;
}
for (k = 1; k < argc; k++)
if (strcmp(argv[k], "--version") == 0) {
printf("zic %s%s\n", PKGVERSION, TZVERSION);
close_file(stdout, NULL, NULL);
return EXIT_SUCCESS;
} else if (strcmp(argv[k], "--help") == 0) {
usage(stdout, EXIT_SUCCESS);
}
while ((c = getopt(argc, argv, "d:l:p:L:vsy:")) != EOF && c != -1)
switch (c) {
default:
usage(stderr, EXIT_FAILURE);
case 'd':
if (directory == NULL)
directory = optarg;
else {
fprintf(stderr,
_("%s: More than one -d option specified\n"),
progname);
return EXIT_FAILURE;
}
break;
case 'l':
if (lcltime == NULL)
lcltime = optarg;
else {
fprintf(stderr,
_("%s: More than one -l option specified\n"),
progname);
return EXIT_FAILURE;
}
break;
case 'p':
if (psxrules == NULL)
psxrules = optarg;
else {
fprintf(stderr,
_("%s: More than one -p option specified\n"),
progname);
return EXIT_FAILURE;
}
break;
case 'y':
if (yitcommand == NULL)
yitcommand = optarg;
else {
fprintf(stderr,
_("%s: More than one -y option specified\n"),
progname);
return EXIT_FAILURE;
}
break;
case 'L':
if (leapsec == NULL)
leapsec = optarg;
else {
fprintf(stderr,
_("%s: More than one -L option specified\n"),
progname);
return EXIT_FAILURE;
}
break;
case 'v':
noise = true;
break;
case 's':
warning(_("-s ignored"));
break;
}
if (optind == argc - 1 && strcmp(argv[optind], "=") == 0)
usage(stderr, EXIT_FAILURE); /* usage message by request */
if (directory == NULL)
directory = TZDIR;
if (yitcommand == NULL)
yitcommand = "yearistype";
if (optind < argc && leapsec != NULL) {
infile(leapsec);
adjleap();
}
for (k = optind; k < argc; k++)
infile(argv[k]);
if (errors)
return EXIT_FAILURE;
associate();
change_directory(directory);
for (i = 0; i < nzones; i = j) {
/*
** Find the next non-continuation zone entry.
*/
for (j = i + 1; j < nzones && zones[j].z_name == NULL; ++j)
continue;
outzone(&zones[i], j - i);
}
/*
** Make links.
*/
for (i = 0; i < nlinks; ++i) {
eat(links[i].l_filename, links[i].l_linenum);
dolink(links[i].l_from, links[i].l_to, false);
if (noise)
for (j = 0; j < nlinks; ++j)
if (strcmp(links[i].l_to,
links[j].l_from) == 0)
warning(_("link to link"));
}
if (lcltime != NULL) {
eat(_("command line"), 1);
dolink(lcltime, TZDEFAULT, true);
}
if (psxrules != NULL) {
eat(_("command line"), 1);
dolink(psxrules, TZDEFRULES, true);
}
if (warnings && (ferror(stderr) || fclose(stderr) != 0))
return EXIT_FAILURE;
return errors ? EXIT_FAILURE : EXIT_SUCCESS;
}
static bool
componentcheck(char const *name, char const *component,
char const *component_end)
{
enum { component_len_max = 14 };
ptrdiff_t component_len = component_end - component;
if (component_len == 0) {
if (!*name)
error (_("empty file name"));
else
error (_(component == name
? "file name '%s' begins with '/'"
: *component_end
? "file name '%s' contains '//'"
: "file name '%s' ends with '/'"),
name);
return false;
}
if (0 < component_len && component_len <= 2
&& component[0] == '.' && component_end[-1] == '.') {
int len = component_len;
error(_("file name '%s' contains '%.*s' component"),
name, len, component);
return false;
}
if (noise) {
if (0 < component_len && component[0] == '-')
warning(_("file name '%s' component contains leading '-'"),
name);
if (component_len_max < component_len)
warning(_("file name '%s' contains overlength component"
" '%.*s...'"),
name, component_len_max, component);
}
return true;
}
static bool
namecheck(const char *name)
{
register char const *cp;
/* Benign characters in a portable file name. */
static char const benign[] =
"-/_"
"abcdefghijklmnopqrstuvwxyz"
"ABCDEFGHIJKLMNOPQRSTUVWXYZ";
/* Non-control chars in the POSIX portable character set,
excluding the benign characters. */
static char const printable_and_not_benign[] =
" !\"#$%&'()*+,.0123456789:;<=>?@[\\]^`{|}~";
register char const *component = name;
for (cp = name; *cp; cp++) {
unsigned char c = *cp;
if (noise && !strchr(benign, c)) {
warning((strchr(printable_and_not_benign, c)
? _("file name '%s' contains byte '%c'")
: _("file name '%s' contains byte '\\%o'")),
name, c);
}
if (c == '/') {
if (!componentcheck(name, component, cp))
return false;
component = cp + 1;
}
}
return componentcheck(name, component, cp);
}
/* Create symlink contents suitable for symlinking FROM to TO, as a
freshly allocated string. FROM should be a relative file name, and
is relative to the global variable DIRECTORY. TO can be either
relative or absolute. */
static char *
relname(char const *from, char const *to)
{
size_t i, taillen, dotdotetcsize;
size_t dir_len = 0, dotdots = 0, linksize = SIZE_MAX;
char const *f = from;
char *result = NULL;
if (*to == '/') {
/* Make F absolute too. */
size_t len = strlen(directory);
bool needslash = len && directory[len - 1] != '/';
linksize = len + needslash + strlen(from) + 1;
f = result = emalloc(linksize);
strcpy(result, directory);
result[len] = '/';
strcpy(result + len + needslash, from);
}
for (i = 0; f[i] && f[i] == to[i]; i++)
if (f[i] == '/')
dir_len = i + 1;
for (; to[i]; i++)
dotdots += to[i] == '/' && to[i - 1] != '/';
taillen = strlen(f + dir_len);
dotdotetcsize = 3 * dotdots + taillen + 1;
if (dotdotetcsize <= linksize) {
if (!result)
result = emalloc(dotdotetcsize);
for (i = 0; i < dotdots; i++)
memcpy(result + 3 * i, "../", 3);
memmove(result + 3 * dotdots, f + dir_len, taillen + 1);
}
return result;
}
/* Hard link FROM to TO, following any symbolic links.
Return 0 if successful, an error number otherwise. */
static int
hardlinkerr(char const *from, char const *to)
{
int r = linkat(AT_FDCWD, from, AT_FDCWD, to, AT_SYMLINK_FOLLOW);
return r == 0 ? 0 : errno;
}
static void
dolink(char const *fromfield, char const *tofield, bool staysymlink)
{
bool todirs_made = false;
int link_errno;
/*
** We get to be careful here since
** there's a fair chance of root running us.
*/
if (itsdir(fromfield)) {
fprintf(stderr, _("%s: link from %s/%s failed: %s\n"),
progname, directory, fromfield, strerror(EPERM));
exit(EXIT_FAILURE);
}
if (staysymlink)
staysymlink = itssymlink(tofield);
if (remove(tofield) == 0)
todirs_made = true;
else if (errno != ENOENT) {
char const *e = strerror(errno);
fprintf(stderr, _("%s: Can't remove %s/%s: %s\n"),
progname, directory, tofield, e);
exit(EXIT_FAILURE);
}
link_errno = staysymlink ? ENOTSUP : hardlinkerr(fromfield, tofield);
if (link_errno == ENOENT && !todirs_made) {
mkdirs(tofield, true);
todirs_made = true;
link_errno = hardlinkerr(fromfield, tofield);
}
if (link_errno != 0) {
bool absolute = *fromfield == '/';
char *linkalloc = absolute ? NULL : relname(fromfield, tofield);
char const *contents = absolute ? fromfield : linkalloc;
int symlink_errno = symlink(contents, tofield) == 0 ? 0 : errno;
if (symlink_errno == ENOENT && !todirs_made) {
mkdirs(tofield, true);
symlink_errno = symlink(contents, tofield) == 0 ? 0 : errno;
}
free(linkalloc);
if (symlink_errno == 0) {
if (link_errno != ENOTSUP)
warning(_("symbolic link used because hard link failed: %s"),
strerror(link_errno));
} else {
FILE *fp, *tp;
int c;
fp = fopen(fromfield, "rb");
if (!fp) {
char const *e = strerror(errno);
fprintf(stderr, _("%s: Can't read %s/%s: %s\n"),
progname, directory, fromfield, e);
exit(EXIT_FAILURE);
}
tp = fopen(tofield, "wb");
if (!tp) {
char const *e = strerror(errno);
fprintf(stderr, _("%s: Can't create %s/%s: %s\n"),
progname, directory, tofield, e);
exit(EXIT_FAILURE);
}
while ((c = getc(fp)) != EOF)
putc(c, tp);
close_file(fp, directory, fromfield);
close_file(tp, directory, tofield);
if (link_errno != ENOTSUP)
warning(_("copy used because hard link failed: %s"),
strerror(link_errno));
else if (symlink_errno != ENOTSUP)
warning(_("copy used because symbolic link failed: %s"),
strerror(symlink_errno));
}
}
}
#define TIME_T_BITS_IN_FILE 64
static zic_t const min_time = MINVAL(zic_t, TIME_T_BITS_IN_FILE);
static zic_t const max_time = MAXVAL(zic_t, TIME_T_BITS_IN_FILE);
/* Estimated time of the Big Bang, in seconds since the POSIX epoch.
rounded downward to the negation of a power of two that is
comfortably outside the error bounds.
For the time of the Big Bang, see:
Ade PAR, Aghanim N, Armitage-Caplan C et al. Planck 2013 results.
I. Overview of products and scientific results.
arXiv:1303.5062 2013-03-20 20:10:01 UTC
<http://arxiv.org/pdf/1303.5062v1> [PDF]
Page 36, Table 9, row Age/Gyr, column Planck+WP+highL+BAO 68% limits
gives the value 13.798 plus-or-minus 0.037 billion years.
Multiplying this by 1000000000 and then by 31557600 (the number of
seconds in an astronomical year) gives a value that is comfortably
less than 2**59, so BIG_BANG is - 2**59.
BIG_BANG is approximate, and may change in future versions.
Please do not rely on its exact value. */
#ifndef BIG_BANG
#define BIG_BANG (- (1LL << 59))
#endif
/* If true, work around GNOME bug 730332
<https://bugzilla.gnome.org/show_bug.cgi?id=730332>
by refusing to output time stamps before BIG_BANG.
Such time stamps are physically suspect anyway.
The GNOME bug is scheduled to be fixed in GNOME 3.22, and if so
this workaround will no longer be needed when GNOME 3.21 and
earlier are obsolete, say in the year 2021. */
enum { WORK_AROUND_GNOME_BUG_730332 = true };
static const zic_t early_time = (WORK_AROUND_GNOME_BUG_730332
? BIG_BANG
: MINVAL(zic_t, TIME_T_BITS_IN_FILE));
/* Return true if NAME is a directory. */
static bool
itsdir(char const *name)
{
struct stat st;
int res = stat(name, &st);
#ifdef S_ISDIR
if (res == 0)
return S_ISDIR(st.st_mode) != 0;
#endif
if (res == 0 || errno == EOVERFLOW) {
size_t n = strlen(name);
char *nameslashdot = emalloc(n + 3);
bool dir;
memcpy(nameslashdot, name, n);
strcpy(&nameslashdot[n], &"/."[! (n && name[n - 1] != '/')]);
dir = stat(nameslashdot, &st) == 0 || errno == EOVERFLOW;
free(nameslashdot);
return dir;
}
return false;
}
/* Return true if NAME is a symbolic link. */
static bool
itssymlink(char const *name)
{
char c;
return 0 <= readlink(name, &c, 1);
}
/*
** Associate sets of rules with zones.
*/
/*
** Sort by rule name.
*/
static int
rcomp(const void *cp1, const void *cp2)
{
return strcmp(((const struct rule *) cp1)->r_name,
((const struct rule *) cp2)->r_name);
}
static void
associate(void)
{
register struct zone * zp;
register struct rule * rp;