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| author | Jonathan Wakely <jwakely@redhat.com> | 2022-03-11 14:52:38 +0000 |
|---|---|---|
| committer | Jonathan Wakely <jwakely@redhat.com> | 2023-05-16 11:15:01 +0100 |
| commit | e4b0d0b84b719ea9cd3d0a7b0668cdd8055a07d2 (patch) | |
| tree | e1e617dcdec9d48464b6e07443ee02f5134dd990 | |
| parent | ccd8faeecfa8042f808eaed9fa1afebdfe6b19c4 (diff) | |
| download | gcc-e4b0d0b84b719ea9cd3d0a7b0668cdd8055a07d2.tar.gz | |
libstdc++: Fix reading UTF-8 characters for 16-bit targets [PR104875]
The current code in read_utf8_code_point assumes that integer promotion
will create a 32-bit int, but that's not true for 16-bit targets like
msp430 and avr. This changes the intermediate variables used for each
octet from unsigned char to char32_t, so that (c << N) works correctly
when N > 8.
libstdc++-v3/ChangeLog:
PR libstdc++/104875
* src/c++11/codecvt.cc (read_utf8_code_point): Use char32_t to
hold octets that will be left-shifted.
(cherry picked from commit 8f7b7c1495f92c72da154d32317943a2cc276ca8)
| -rw-r--r-- | libstdc++-v3/src/c++11/codecvt.cc | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/libstdc++-v3/src/c++11/codecvt.cc b/libstdc++-v3/src/c++11/codecvt.cc index f8a50fb7150..04252d6dc2a 100644 --- a/libstdc++-v3/src/c++11/codecvt.cc +++ b/libstdc++-v3/src/c++11/codecvt.cc @@ -254,7 +254,7 @@ namespace const size_t avail = from.size(); if (avail == 0) return incomplete_mb_character; - unsigned char c1 = from[0]; + char32_t c1 = (unsigned char) from[0]; // https://en.wikipedia.org/wiki/UTF-8#Sample_code if (c1 < 0x80) { @@ -267,7 +267,7 @@ namespace { if (avail < 2) return incomplete_mb_character; - unsigned char c2 = from[1]; + char32_t c2 = (unsigned char) from[1]; if ((c2 & 0xC0) != 0x80) return invalid_mb_sequence; char32_t c = (c1 << 6) + c2 - 0x3080; @@ -279,12 +279,12 @@ namespace { if (avail < 3) return incomplete_mb_character; - unsigned char c2 = from[1]; + char32_t c2 = (unsigned char) from[1]; if ((c2 & 0xC0) != 0x80) return invalid_mb_sequence; if (c1 == 0xE0 && c2 < 0xA0) // overlong return invalid_mb_sequence; - unsigned char c3 = from[2]; + char32_t c3 = (unsigned char) from[2]; if ((c3 & 0xC0) != 0x80) return invalid_mb_sequence; char32_t c = (c1 << 12) + (c2 << 6) + c3 - 0xE2080; @@ -296,17 +296,17 @@ namespace { if (avail < 4) return incomplete_mb_character; - unsigned char c2 = from[1]; + char32_t c2 = (unsigned char) from[1]; if ((c2 & 0xC0) != 0x80) return invalid_mb_sequence; if (c1 == 0xF0 && c2 < 0x90) // overlong return invalid_mb_sequence; if (c1 == 0xF4 && c2 >= 0x90) // > U+10FFFF return invalid_mb_sequence; - unsigned char c3 = from[2]; + char32_t c3 = (unsigned char) from[2]; if ((c3 & 0xC0) != 0x80) return invalid_mb_sequence; - unsigned char c4 = from[3]; + char32_t c4 = (unsigned char) from[3]; if ((c4 & 0xC0) != 0x80) return invalid_mb_sequence; char32_t c = (c1 << 18) + (c2 << 12) + (c3 << 6) + c4 - 0x3C82080; |