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getpwuid(mingw): provide a better default for the user name

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We do have the excellent GetUserInfoEx() function to obtain more
detailed information of the current user (if the user is part of a
Windows domain); Let's use it.

Suggested by Lutz Roeder.

To avoid the cost of loading Secur32.dll (even lazily, loading DLLs
takes a non-neglibile amount of time), we use the established technique
to load DLLs only when, and if, needed.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
This commit is contained in:
Johannes Schindelin
2015-10-13 10:05:53 +00:00
parent b7e978ae2d
commit 1301fcb80b
1 changed files with 30 additions and 1 deletions
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31
compat/mingw.c
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@@ -1765,6 +1765,33 @@ int mingw_getpagesize(void)
return si.dwAllocationGranularity;
}
/* See https://msdn.microsoft.com/en-us/library/windows/desktop/ms724435.aspx */
enum EXTENDED_NAME_FORMAT {
NameDisplay = 3,
NameUserPrincipal = 8
};
static char *get_extended_user_info(enum EXTENDED_NAME_FORMAT type)
{
DECLARE_PROC_ADDR(secur32.dll, BOOL, GetUserNameExW,
enum EXTENDED_NAME_FORMAT, LPCWSTR, PULONG);
static wchar_t wbuffer[1024];
DWORD len;
if (!INIT_PROC_ADDR(GetUserNameExW))
return NULL;
len = ARRAY_SIZE(wbuffer);
if (GetUserNameExW(type, wbuffer, &len)) {
char *converted = xmalloc((len *= 3));
if (xwcstoutf(converted, wbuffer, len) >= 0)
return converted;
free(converted);
}
return NULL;
}
struct passwd *getpwuid(int uid)
{
static unsigned initialized;
@@ -1783,7 +1810,9 @@ struct passwd *getpwuid(int uid)
p = xmalloc(sizeof(*p));
p->pw_name = user_name;
p->pw_gecos = "unknown";
p->pw_gecos = get_extended_user_info(NameDisplay);
if (!p->pw_gecos)
p->pw_gecos = "unknown";
p->pw_dir = NULL;
initialized = 1;