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Win32: use low-level memory allocation during initialization
As of d41489a6
"Add more large blob test cases", git's high-level memory
allocation functions (xmalloc, xmemdupz etc.) access the environment to
simulate limited memory in tests (see 'getenv("GIT_ALLOC_LIMIT")' in
memory_limit_check()). These functions should not be used before the
environment is fully initialized (particularly not to initialize the
environment itself).
The current solution ('environ = NULL; ALLOC_GROW(environ...)') only works
because MSVCRT's getenv() reinitializes environ when it is NULL (i.e. it
leaves us with two sets of unusabe (non-UTF-8) and unfreeable (CRT-
allocated) environments).
Add our own set of malloc-or-die functions to be used in startup code.
Also check the result of __wgetmainargs, which may fail if there's not
enough memory for wide-char arguments and environment.
This patch is in preparation of the sorted environment feature, which
completely replaces MSVCRT's getenv() implementation.
Signed-off-by: Karsten Blees <blees@dcon.de>
Signed-off-by: Stepan Kasal <kasal@ucw.cz>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
parent
f279242d5e
commit
6f1c189cad
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@ -2033,9 +2033,23 @@ static NORETURN void die_startup()
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exit(128);
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}
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static void *malloc_startup(size_t size)
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{
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void *result = malloc(size);
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if (!result)
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die_startup();
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return result;
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}
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static char *wcstoutfdup_startup(char *buffer, const wchar_t *wcs, size_t len)
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{
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len = xwcstoutf(buffer, wcs, len) + 1;
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return memcpy(malloc_startup(len), buffer, len);
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}
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void mingw_startup()
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{
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int i, len, maxlen, argc;
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int i, maxlen, argc;
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char *buffer;
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wchar_t **wenv, **wargv;
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_startupinfo si;
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@ -2052,26 +2066,25 @@ void mingw_startup()
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for (i = 0; wenv[i]; i++)
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maxlen = max(maxlen, wcslen(wenv[i]));
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/* nedmalloc can't free CRT memory, allocate resizable environment list */
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environ = NULL;
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/*
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* nedmalloc can't free CRT memory, allocate resizable environment
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* list. Note that xmalloc / xmemdupz etc. call getenv, so we cannot
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* use it while initializing the environment itself.
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*/
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environ_size = i + 1;
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ALLOC_GROW(environ, environ_size * sizeof(char*), environ_alloc);
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environ_alloc = alloc_nr(environ_size * sizeof(char*));
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environ = malloc_startup(environ_alloc);
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/* allocate buffer (wchar_t encodes to max 3 UTF-8 bytes) */
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maxlen = 3 * maxlen + 1;
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buffer = xmalloc(maxlen);
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buffer = malloc_startup(maxlen);
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/* convert command line arguments and environment to UTF-8 */
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len = xwcstoutf(buffer, _wpgmptr, maxlen);
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__argv[0] = xmemdupz(buffer, len);
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for (i = 1; i < argc; i++) {
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len = xwcstoutf(buffer, wargv[i], maxlen);
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__argv[i] = xmemdupz(buffer, len);
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}
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for (i = 0; wenv[i]; i++) {
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len = xwcstoutf(buffer, wenv[i], maxlen);
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environ[i] = xmemdupz(buffer, len);
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}
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__argv[0] = wcstoutfdup_startup(buffer, _wpgmptr, maxlen);
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for (i = 1; i < argc; i++)
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__argv[i] = wcstoutfdup_startup(buffer, wargv[i], maxlen);
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for (i = 0; wenv[i]; i++)
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environ[i] = wcstoutfdup_startup(buffer, wenv[i], maxlen);
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environ[i] = NULL;
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free(buffer);
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