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37 lines
1.2 KiB
Diff
37 lines
1.2 KiB
Diff
From 7442442ccc665641a8827177e8e7ed45bbbd6584 Mon Sep 17 00:00:00 2001
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From: Rich Felker <dalias@aerifal.cx>
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Date: Mon, 7 Nov 2016 20:39:59 -0500
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Subject: fix swprintf internal buffer state and error handling
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the swprintf write callback never reset its buffer pointers, so after
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its 256-byte buffer filled up, it would keep repeating those bytes
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over and over in the output until the destination buffer filled up. it
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also failed to set the error indicator for the stream on EILSEQ,
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potentially allowing output to continue after the error.
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---
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src/stdio/vswprintf.c | 9 ++++++++-
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1 file changed, 8 insertions(+), 1 deletion(-)
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diff --git a/src/stdio/vswprintf.c b/src/stdio/vswprintf.c
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index 7d237ba..6eb2f6a 100644
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--- a/src/stdio/vswprintf.c
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+++ b/src/stdio/vswprintf.c
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@@ -24,7 +24,14 @@ static size_t sw_write(FILE *f, const unsigned char *s, size_t l)
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c->ws++;
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}
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*c->ws = 0;
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- return i<0 ? i : l0;
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+ if (i < 0) {
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+ f->wpos = f->wbase = f->wend = 0;
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+ f->flags |= F_ERR;
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+ return i;
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+ }
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+ f->wend = f->buf + f->buf_size;
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+ f->wpos = f->wbase = f->buf;
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+ return l0;
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}
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int vswprintf(wchar_t *restrict s, size_t n, const wchar_t *restrict fmt, va_list ap)
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--
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cgit v0.11.2
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