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[CRT] Only write to the output buffer when necessary in _strupr. CORE-16667

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Fixes crash in msvcrt_winetest:string.

This is a hack and is supposed to be specific to the C locale.
This commit is contained in:
Thomas Faber 2019-09-08 15:23:32 +02:00
parent feb7275bc8
commit e884290d29
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GPG key ID: 076E7C3D44720826
1 changed files with 5 additions and 1 deletions
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6
sdk/lib/crt/string/strupr.c
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@ -16,9 +16,13 @@
char * CDECL _strupr(char *x) char * CDECL _strupr(char *x)
{ {
char *y=x; char *y=x;
char ch, upper;
while (*y) { while (*y) {
*y=toupper(*y); ch = *y;
upper = toupper(ch);
if (ch != upper)
*y = upper;
y++; y++;
} }
return x; return x;