1 files changed, 29 insertions, 6 deletions

diff --git a/win32/winansi.c b/win32/winansi.c
index aaaa2fa50..c88c096d2 100644
--- a/win32/winansi.c
+++ b/win32/winansi.c
@@ -1534,6 +1534,25 @@ void console_write(const char *str, int len)
         free(buf);
 }
 
+// LC_ALL=C disables console output conversion, so that the source
+// data is interpreted only by the console according to its output CP.
+static int conout_conv_enabled(void)
+{
+        static int enabled, tested;  /* = 0 */
+
+        if (!tested) {
+                // keep in sync with [re]init_unicode at libbb/unicode.c
+                char *s = getenv("LC_ALL");
+                if (!s) s = getenv("LC_CTYPE");
+                if (!s) s = getenv("LANG");
+
+                enabled = !(s && s[0] == 'C' && s[1] == 0);
+                tested = 1;
+        }
+
+        return enabled;
+}
+
 // TODO: improvements:
 //
 // 1. currently conv_[f]writeCon modify buf inplace, which means the caller
@@ -1554,12 +1573,14 @@ void console_write(const char *str, int len)
 // returns EOF on error, 0 on success
 static int conv_fwriteCon(FILE *stream, char *buf, size_t siz)
 {
+        if (conout_conv_enabled()) {
 #if ENABLE_FEATURE_UTF8_OUTPUT
-        if (GetConsoleOutputCP() != CP_UTF8)
-                return writeCon_utf8(fileno(stream), buf, siz) ? EOF : 0;
+                if (GetConsoleOutputCP() != CP_UTF8)
+                        return writeCon_utf8(fileno(stream), buf, siz) ? EOF : 0;
 #else
-        charToConBuffA(buf, siz);
+                charToConBuffA(buf, siz);
 #endif
+        }
         return fwrite(buf, 1, siz, stream) < siz ? EOF : 0;
 }
 
@@ -1567,11 +1588,13 @@ static int conv_fwriteCon(FILE *stream, char *buf, size_t siz)
 // returns -1 on error, actually-written bytes on suceess
 static int conv_writeCon(int fd, char *buf, size_t siz)
 {
+        if (conout_conv_enabled()) {
 #if ENABLE_FEATURE_UTF8_OUTPUT
-        if (GetConsoleOutputCP() != CP_UTF8)
-                return writeCon_utf8(fd, buf, siz) ? -1 : siz;
+                if (GetConsoleOutputCP() != CP_UTF8)
+                        return writeCon_utf8(fd, buf, siz) ? -1 : siz;
 #else
-        charToConBuffA(buf, siz);
+                charToConBuffA(buf, siz);
 #endif
+        }
         return write(fd, buf, siz);
 }