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Sync our copy of the timezone library with IANA release tzcode2016h.

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This absorbs a fix for a symlink-manipulation bug in zic that was
introduced in 2016g.  It probably isn't interesting for our use-case,
but I'm not quite sure, so let's update while we're at it.
This commit is contained in:
Tom Lane 2016-10-20 15:40:07 -04:00
parent d8fc45bd0f
commit 5e21b68111
1 changed files with 56 additions and 20 deletions
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76
src/timezone/zic.c
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@ -789,6 +789,56 @@ namecheck(const char *name)
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.
*/
#ifdef HAVE_SYMLINK
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 (; f[i]; i++)
dotdots += f[i] == '/' && f[i - 1] != '/';
taillen = i - 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;
}
#endif /* HAVE_SYMLINK */
static void
dolink(char const * fromfield, char const * tofield, bool staysymlink)
{
@ -832,31 +882,17 @@ dolink(char const * fromfield, char const * tofield, bool staysymlink)
if (link_errno != 0)
{
#ifdef HAVE_SYMLINK
const char *s = fromfield;
const char *t;
char *p;
size_t dotdots = 0;
char *symlinkcontents;
int symlink_errno;
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;
do
t = s;
while ((s = strchr(s, '/'))
&& strncmp(fromfield, tofield, ++s - fromfield) == 0);
for (s = tofield + (t - fromfield); *s; s++)
dotdots += *s == '/';
symlinkcontents = emalloc(3 * dotdots + strlen(t) + 1);
for (p = symlinkcontents; dotdots-- != 0; p += 3)
memcpy(p, "../", 3);
strcpy(p, t);
symlink_errno = symlink(symlinkcontents, tofield) == 0 ? 0 : errno;
if (symlink_errno == ENOENT && !todirs_made)
{
mkdirs(tofield, true);
symlink_errno = symlink(symlinkcontents, tofield) == 0 ? 0 : errno;
symlink_errno = symlink(contents, tofield) == 0 ? 0 : errno;
}
free(symlinkcontents);
free(linkalloc);
if (symlink_errno == 0)
{
if (link_errno != ENOTSUP)