Blame SOURCES/bash-5.1-mbrtowc.patch
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diff --git a/subst.c b/subst.c
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--- a/subst.c
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+++ b/subst.c
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@@ -6240,7 +6240,7 @@ read_comsub (fd, quoted, flags, rflag)
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/* read a multibyte character from buf */
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/* punt on the hard case for now */
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memset (&ps, '\0', sizeof (mbstate_t));
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- mblen = mbrtowc (&wc, bufp-1, bufn+1, &ps);
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+ mblen = mbrtowc (&wc, bufp-1, bufn, &ps);
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if (MB_INVALIDCH (mblen) || mblen == 0 || mblen == 1)
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istring[istring_index++] = c;
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else
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