WIN32: stop forcing narrow-character API

Except where the results are only used for character output.
getenv is not touched because it's part of the public API, and having
it return UTF-8 instead of ANSI would be a breaking change.

Fixes https://github.com/curl/curl/issues/5658
Fixes https://github.com/curl/curl/issues/5712
Closes https://github.com/curl/curl/pull/5718

7 files changed, 38 insertions, 16 deletions

diff --git a/lib/rename.c b/lib/rename.c
index bb170d3cc..fe5f95d0d 100644
--- a/lib/rename.c
+++ b/lib/rename.c
@@ -27,6 +27,7 @@
 #if (!defined(CURL_DISABLE_HTTP) && !defined(CURL_DISABLE_COOKIES)) ||  \
   defined(USE_ALTSVC)
 
+#include "curl_multibyte.h"
 #include "timeval.h"
 
 /* The last 3 #include files should be in this order */
@@ -39,17 +40,25 @@ int Curl_rename(const char *oldpath, const char *newpath)
 {
 #ifdef WIN32
   /* rename() on Windows doesn't overwrite, so we can't use it here.
-     MoveFileExA() will overwrite and is usually atomic, however it fails
+     MoveFileEx() will overwrite and is usually atomic, however it fails
      when there are open handles to the file. */
   const int max_wait_ms = 1000;
   struct curltime start = Curl_now();
+  TCHAR *tchar_oldpath = curlx_convert_UTF8_to_tchar((char *)oldpath);
+  TCHAR *tchar_newpath = curlx_convert_UTF8_to_tchar((char *)newpath);
   for(;;) {
     timediff_t diff;
-    if(MoveFileExA(oldpath, newpath, MOVEFILE_REPLACE_EXISTING))
+    if(MoveFileEx(tchar_oldpath, tchar_newpath, MOVEFILE_REPLACE_EXISTING)) {
+      curlx_unicodefree(tchar_oldpath);
+      curlx_unicodefree(tchar_newpath);
       break;
+    }
     diff = Curl_timediff(Curl_now(), start);
-    if(diff < 0 || diff > max_wait_ms)
+    if(diff < 0 || diff > max_wait_ms) {
+      curlx_unicodefree(tchar_oldpath);
+      curlx_unicodefree(tchar_newpath);
       return 1;
+    }
     Sleep(1);
   }
 #else
diff --git a/lib/vtls/openssl.c b/lib/vtls/openssl.c
index 2e9f900da..cc18b8c81 100644
--- a/lib/vtls/openssl.c
+++ b/lib/vtls/openssl.c
@@ -2825,7 +2825,8 @@ static CURLcode ossl_connect_step1(struct connectdata *conn, int sockindex)
   if((SSL_CONN_CONFIG(verifypeer) || SSL_CONN_CONFIG(verifyhost)) &&
      (SSL_SET_OPTION(native_ca_store))) {
     X509_STORE *store = SSL_CTX_get_cert_store(backend->ctx);
-    HCERTSTORE hStore = CertOpenSystemStoreA((HCRYPTPROV_LEGACY)NULL, "ROOT");
+    HCERTSTORE hStore = CertOpenSystemStore((HCRYPTPROV_LEGACY)NULL,
+                                            TEXT("ROOT"));
 
     if(hStore) {
       PCCERT_CONTEXT pContext = NULL;
diff --git a/lib/vtls/schannel.c b/lib/vtls/schannel.c
index 199652606..c685de2e1 100644
--- a/lib/vtls/schannel.c
+++ b/lib/vtls/schannel.c
@@ -448,7 +448,7 @@ schannel_connect_step1(struct connectdata *conn, int sockindex)
   /* ALPN is only supported on Windows 8.1 / Server 2012 R2 and above.
      Also it doesn't seem to be supported for Wine, see curl bug #983. */
   BACKEND->use_alpn = conn->bits.tls_enable_alpn &&
-    !GetProcAddress(GetModuleHandleA("ntdll"),
+    !GetProcAddress(GetModuleHandle(TEXT("ntdll")),
                     "wine_get_version") &&
     Curl_verify_windows_version(6, 3, PLATFORM_WINNT,
                                 VERSION_GREATER_THAN_EQUAL);
diff --git a/src/tool_doswin.c b/src/tool_doswin.c
index b7df3e615..78285a21b 100644
--- a/src/tool_doswin.c
+++ b/src/tool_doswin.c
@@ -36,6 +36,7 @@
 #include "tool_bname.h"
 #include "tool_doswin.h"
 
+#include "curlx.h"
 #include "memdebug.h" /* keep this as LAST include */
 
 #ifdef WIN32
@@ -612,7 +613,7 @@ char **__crt0_glob_function(char *arg)
 
 CURLcode FindWin32CACert(struct OperationConfig *config,
                          curl_sslbackend backend,
-                         const char *bundle_file)
+                         const TCHAR *bundle_file)
 {
   CURLcode result = CURLE_OK;
 
@@ -626,15 +627,19 @@ CURLcode FindWin32CACert(struct OperationConfig *config,
      backend != CURLSSLBACKEND_SCHANNEL) {
 
     DWORD res_len;
-    char buf[PATH_MAX];
-    char *ptr = NULL;
+    TCHAR buf[PATH_MAX];
+    TCHAR *ptr = NULL;
 
-    buf[0] = '\0';
+    buf[0] = TEXT('\0');
 
-    res_len = SearchPathA(NULL, bundle_file, NULL, PATH_MAX, buf, &ptr);
+    res_len = SearchPath(NULL, bundle_file, NULL, PATH_MAX, buf, &ptr);
     if(res_len > 0) {
       Curl_safefree(config->cacert);
+#ifdef UNICODE
+      config->cacert = curlx_convert_wchar_to_UTF8(buf);
+#else
       config->cacert = strdup(buf);
+#endif
       if(!config->cacert)
         result = CURLE_OUT_OF_MEMORY;
     }
@@ -702,7 +707,7 @@ bool tool_isVistaOrGreater;
 
 CURLcode win32_init(void)
 {
-  OSVERSIONINFOEXA osvi;
+  OSVERSIONINFOEX osvi;
   unsigned __int64 mask = 0;
   unsigned char op = VER_GREATER_EQUAL;
 
@@ -712,7 +717,7 @@ CURLcode win32_init(void)
   VER_SET_CONDITION(mask, VER_MAJORVERSION, op);
   VER_SET_CONDITION(mask, VER_MINORVERSION, op);
 
-  if(VerifyVersionInfoA(&osvi, (VER_MAJORVERSION | VER_MINORVERSION), mask))
+  if(VerifyVersionInfo(&osvi, (VER_MAJORVERSION | VER_MINORVERSION), mask))
     tool_isVistaOrGreater = true;
   else if(GetLastError() == ERROR_OLD_WIN_VERSION)
     tool_isVistaOrGreater = false;
diff --git a/src/tool_doswin.h b/src/tool_doswin.h
index d1649d1f3..ab23f8d65 100644
--- a/src/tool_doswin.h
+++ b/src/tool_doswin.h
@@ -59,7 +59,7 @@ char **__crt0_glob_function(char *arg);
 
 CURLcode FindWin32CACert(struct OperationConfig *config,
                          curl_sslbackend backend,
-                         const char *bundle_file);
+                         const TCHAR *bundle_file);
 struct curl_slist *GetLoadedModulePaths(void);
 CURLcode win32_init(void);
 
diff --git a/src/tool_filetime.c b/src/tool_filetime.c
index 6071e44d2..3970570e4 100644
--- a/src/tool_filetime.c
+++ b/src/tool_filetime.c
@@ -21,6 +21,8 @@
  ***************************************************************************/
 #include "tool_filetime.h"
 
+#include "curlx.h"
+
 #ifdef HAVE_UTIME_H
 #  include <utime.h>
 #elif defined(HAVE_SYS_UTIME_H)
@@ -36,11 +38,13 @@ curl_off_t getfiletime(const char *filename, FILE *error_stream)
    access to a 64-bit type we can bypass stat and get the times directly. */
 #if defined(WIN32) && (SIZEOF_CURL_OFF_T >= 8)
   HANDLE hfile;
+  TCHAR *tchar_filename = curlx_convert_UTF8_to_tchar((char *)filename);
 
-  hfile = CreateFileA(filename, FILE_READ_ATTRIBUTES,
+  hfile = CreateFile(tchar_filename, FILE_READ_ATTRIBUTES,
                       (FILE_SHARE_READ | FILE_SHARE_WRITE |
                        FILE_SHARE_DELETE),
                       NULL, OPEN_EXISTING, 0, NULL);
+  curlx_unicodefree(tchar_filename);
   if(hfile != INVALID_HANDLE_VALUE) {
     FILETIME ft;
     if(GetFileTime(hfile, NULL, NULL, &ft)) {
@@ -93,6 +97,7 @@ void setfiletime(curl_off_t filetime, const char *filename,
    access to a 64-bit type we can bypass utime and set the times directly. */
 #if defined(WIN32) && (SIZEOF_CURL_OFF_T >= 8)
     HANDLE hfile;
+    TCHAR *tchar_filename = curlx_convert_UTF8_to_tchar((char *)filename);
 
     /* 910670515199 is the maximum unix filetime that can be used as a
        Windows FILETIME without overflow: 30827-12-31T23:59:59. */
@@ -100,13 +105,15 @@ void setfiletime(curl_off_t filetime, const char *filename,
       fprintf(error_stream,
               "Failed to set filetime %" CURL_FORMAT_CURL_OFF_T
               " on outfile: overflow\n", filetime);
+      curlx_unicodefree(tchar_filename);
       return;
     }
 
-    hfile = CreateFileA(filename, FILE_WRITE_ATTRIBUTES,
+    hfile = CreateFile(tchar_filename, FILE_WRITE_ATTRIBUTES,
                         (FILE_SHARE_READ | FILE_SHARE_WRITE |
                          FILE_SHARE_DELETE),
                         NULL, OPEN_EXISTING, 0, NULL);
+    curlx_unicodefree(tchar_filename);
     if(hfile != INVALID_HANDLE_VALUE) {
       curl_off_t converted = ((curl_off_t)filetime * 10000000) +
                              CURL_OFF_T_C(116444736000000000);
diff --git a/src/tool_operate.c b/src/tool_operate.c
index 29daff02a..ad4e85dd8 100644
--- a/src/tool_operate.c
+++ b/src/tool_operate.c
@@ -2415,7 +2415,7 @@ static CURLcode transfer_per_config(struct GlobalConfig *global,
 #ifdef WIN32
       else {
         result = FindWin32CACert(config, tls_backend_info->backend,
-                                 "curl-ca-bundle.crt");
+                                 TEXT("curl-ca-bundle.crt"));
       }
 #endif
     }