msvcrt: Use memmove() instead of memcpy() puts_clbk_str().

memcpy() must not be used here, because results are undefined if the memory areas overlap. This can cause problems, particularly if particular compiler optimisations are enabled. Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=47918Signed-off-by: Felix Hädicke <felixhaedicke@web.de> Signed-off-by: Piotr Caban <piotr@codeweavers.com> Signed-off-by: Alexandre Julliard <julliard@winehq.org>

msvcrt: Use memmove() instead of memcpy() puts_clbk_str().
90e520b4 · Felix Hädicke · Alexandre Julliard · 8d6183c8 · 90e520b4 · 90e520b4
Commit 90e520b4 authored Oct 10, 2019 by Felix Hädicke Committed by Alexandre Julliard Oct 16, 2019
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printf.h dlls/msvcrt/printf.h +2 -2

wcs.c dlls/msvcrt/wcs.c +2 -2

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--- a/dlls/msvcrt/printf.h
+++ b/dlls/msvcrt/printf.h
@@ -52,13 +52,13 @@ static int FUNC_NAME(puts_clbk_str)(void *ctx, int len, const APICHAR *str)
        return len;

    if(out->len < len) {
-        memcpy(out->buf, str, out->len*sizeof(APICHAR));
+        memmove(out->buf, str, out->len*sizeof(APICHAR));
        out->buf += out->len;
        out->len = 0;
        return -1;
    }

-    memcpy(out->buf, str, len*sizeof(APICHAR));
+    memmove(out->buf, str, len*sizeof(APICHAR));
    out->buf += len;
    out->len -= len;
    return len;

--- a/dlls/msvcrt/wcs.c
+++ b/dlls/msvcrt/wcs.c
@@ -781,13 +781,13 @@ static int puts_clbk_str_c99_a(void *ctx, int len, const char *str)
        return len;

    if(out->len < len) {
-        memcpy(out->buf, str, out->len);
+        memmove(out->buf, str, out->len);
        out->buf += out->len;
        out->len = 0;
        return len;
    }

-    memcpy(out->buf, str, len);
+    memmove(out->buf, str, len);
    out->buf += len;
    out->len -= len;
    return len;