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mingw.c: Fix complier warnings for a 64 bit msvc

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Remove some complier warnings from msvc in compat/mingw.c for value
truncation from 64 bit to 32 bit integers.

Compiling compat/mingw.c under a 64 bit version of msvc produces
warnings. An "int" is 32 bit, and ssize_t or size_t should be 64 bit
long. Prepare compat/vcbuild/include/unistd.h to have a 64 bit type
_ssize_t, when _WIN64 is defined and 32 bit otherwise.

Further down in this include file, as before, ssize_t is defined as
_ssize_t, if needed.

Use size_t instead of int for all variables that hold the result of
strlen() or wcslen() (which cannot be negative).

Use ssize_t to hold the return value of read().

Signed-off-by: Sören Krecker <soekkle@freenet.de>
Signed-off-by: Taylor Blau <me@ttaylorr.com>
This commit is contained in:
Sören Krecker 2024-10-17 19:18:20 +02:00 committed by Taylor Blau
parent 15030f9556
commit 386d372031
3 changed files with 21 additions and 12 deletions
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4
compat/compiler.h
View file

@ -9,7 +9,7 @@
static inline void get_compiler_info(struct strbuf *info)
{
int len = info->len;
size_t len = info->len;
#ifdef __clang__
strbuf_addf(info, "clang: %s\n", __clang_version__);
#elif defined(__GNUC__)
@ -27,7 +27,7 @@ static inline void get_compiler_info(struct strbuf *info)
static inline void get_libc_info(struct strbuf *info)
{
int len = info->len;
size_t len = info->len;
#ifdef __GLIBC__
strbuf_addf(info, "glibc: %s\n", gnu_get_libc_version());

25
compat/mingw.c
View file

@ -782,7 +782,7 @@ static inline void filetime_to_timespec(const FILETIME *ft, struct timespec *ts)
*/
static int has_valid_directory_prefix(wchar_t *wfilename)
{
int n = wcslen(wfilename);
size_t n = wcslen(wfilename);
while (n > 0) {
wchar_t c = wfilename[--n];
@ -891,7 +891,7 @@ static int do_lstat(int follow, const char *file_name, struct stat *buf)
*/
static int do_stat_internal(int follow, const char *file_name, struct stat *buf)
{
int namelen;
size_t namelen;
char alt_name[PATH_MAX];
if (!do_lstat(follow, file_name, buf))
@ -1274,7 +1274,8 @@ static const char *parse_interpreter(const char *cmd)
{
static char buf[100];
char *p, *opt;
int n, fd;
ssize_t n; /* read() can return negative values */
int fd;
/* don't even try a .exe */
n = strlen(cmd);
@ -1339,7 +1340,7 @@ static char *path_lookup(const char *cmd, int exe_only)
{
const char *path;
char *prog = NULL;
int len = strlen(cmd);
size_t len = strlen(cmd);
int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
if (strpbrk(cmd, "/\\"))
@ -1956,7 +1957,7 @@ char *mingw_getenv(const char *name)
#define GETENV_MAX_RETAIN 64
static char *values[GETENV_MAX_RETAIN];
static int value_counter;
int len_key, len_value;
size_t len_key, len_value;
wchar_t *w_key;
char *value;
wchar_t w_value[32768];
@ -1968,7 +1969,8 @@ char *mingw_getenv(const char *name)
/* We cannot use xcalloc() here because that uses getenv() itself */
w_key = calloc(len_key, sizeof(wchar_t));
if (!w_key)
die("Out of memory, (tried to allocate %u wchar_t's)", len_key);
die("Out of memory, (tried to allocate %"PRIuMAX" wchar_t's)",
(uintmax_t)len_key);
xutftowcs(w_key, name, len_key);
/* GetEnvironmentVariableW() only sets the last error upon failure */
SetLastError(ERROR_SUCCESS);
@ -1983,7 +1985,8 @@ char *mingw_getenv(const char *name)
/* We cannot use xcalloc() here because that uses getenv() itself */
value = calloc(len_value, sizeof(char));
if (!value)
die("Out of memory, (tried to allocate %u bytes)", len_value);
die("Out of memory, (tried to allocate %"PRIuMAX" bytes)",
(uintmax_t)len_value);
xwcstoutf(value, w_value, len_value);
/*
@ -2001,7 +2004,7 @@ char *mingw_getenv(const char *name)
int mingw_putenv(const char *namevalue)
{
int size;
size_t size;
wchar_t *wide, *equal;
BOOL result;
@ -2011,7 +2014,8 @@ int mingw_putenv(const char *namevalue)
size = strlen(namevalue) * 2 + 1;
wide = calloc(size, sizeof(wchar_t));
if (!wide)
die("Out of memory, (tried to allocate %u wchar_t's)", size);
die("Out of memory, (tried to allocate %" PRIuMAX " wchar_t's)",
(uintmax_t)size);
xutftowcs(wide, namevalue, size);
equal = wcschr(wide, L'=');
if (!equal)
@ -3085,7 +3089,8 @@ static void maybe_redirect_std_handles(void)
*/
int wmain(int argc, const wchar_t **wargv)
{
int i, maxlen, exit_status;
int i, exit_status;
size_t maxlen;
char *buffer, **save;
const char **argv;

4
compat/vcbuild/include/unistd.h
View file

@ -14,7 +14,11 @@ typedef _mode_t mode_t;
#ifndef _SSIZE_T_
#define _SSIZE_T_
#ifdef _WIN64
typedef __int64 _ssize_t;
#else
typedef long _ssize_t;
#endif /* _WIN64 */
#ifndef _OFF_T_
#define _OFF_T_