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8f8145105c
POSIX specifies the C conversion specifier as being "equivalent to %lc",
i.e. printf("%C", arg) is equivalent in behaviour to printf("%lc", arg).
This patch implements this conversion specifier, and adds a test for it,
alongside another test, which ensures that va_arg uses the correct size,
even though we set signbit to 63 in the code (which one might think will
result in the wrong size of argument being va_arg-ed, but having signbit
set to 63 is in fact what __fmt_stoa expects and is a requirement for it
properly formatting the wchar_t argument - this does not result in wrong
usage of va_arg because the implementation of the c conversion specifier
(which the implementation of the C conversion specifier fallsthrough to)
always calls va_arg with an argument type of int, to avoid the very same
bug occuring with %lc, as the l length modifier also sets signbit to 63)
103 lines
3.8 KiB
C
103 lines
3.8 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2023 Gabriel Ravier │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/stdio/stdio.h"
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#include "libc/str/str.h"
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#include "libc/testlib/testlib.h"
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TEST(snprintf, testVeryLargePrecision) {
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char buf[512] = {};
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int i = snprintf(buf, sizeof(buf), "%.9999u", 10);
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ASSERT_EQ(i, 9999);
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ASSERT_EQ(strlen(buf), 511);
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}
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TEST(snprintf, testPlusFlagOnChar) {
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char buf[10] = {};
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int i = snprintf(buf, sizeof(buf), "%+c", '=');
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ASSERT_EQ(i, 1);
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ASSERT_STREQ(buf, "=");
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}
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TEST(snprintf, testInf) {
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char buf[10] = {};
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int i = snprintf(buf, sizeof(buf), "%f", 1.0 / 0.0);
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ASSERT_EQ(i, 3);
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ASSERT_STREQ(buf, "inf");
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memset(buf, 0, 4);
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i = snprintf(buf, sizeof(buf), "%Lf", 1.0L / 0.0L);
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ASSERT_EQ(i, 3);
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ASSERT_STREQ(buf, "inf");
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memset(buf, 0, 4);
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i = snprintf(buf, sizeof(buf), "%e", 1.0 / 0.0);
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ASSERT_EQ(i, 3);
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ASSERT_STREQ(buf, "inf");
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memset(buf, 0, 4);
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i = snprintf(buf, sizeof(buf), "%Le", 1.0L / 0.0L);
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ASSERT_EQ(i, 3);
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ASSERT_STREQ(buf, "inf");
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memset(buf, 0, 4);
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i = snprintf(buf, sizeof(buf), "%g", 1.0 / 0.0);
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ASSERT_EQ(i, 3);
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ASSERT_STREQ(buf, "inf");
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memset(buf, 0, 4);
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i = snprintf(buf, sizeof(buf), "%Lg", 1.0L / 0.0L);
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ASSERT_EQ(i, 3);
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ASSERT_STREQ(buf, "inf");
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for (i = 4; i < 10; ++i)
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ASSERT_EQ(buf[i], '\0');
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}
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TEST(snprintf, testUppercaseCConversionSpecifier) {
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char buf[10] = {};
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int i = snprintf(buf, sizeof(buf), "%C", L'a');
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ASSERT_EQ(i, 1);
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ASSERT_STREQ(buf, "a");
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i = snprintf(buf, sizeof(buf), "%C", L'☺');
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ASSERT_EQ(i, 3);
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ASSERT_STREQ(buf, "☺");
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}
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// Make sure we don't va_arg the wrong argument size on wide character
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// conversion specifiers
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TEST(snprintf,
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testWideCConversionSpecifierWithLotsOfArgumentsBeforeAndOneAfter) {
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char buf[20] = {};
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int i = snprintf(buf, sizeof(buf), "%d%d%d%d%d%d%d%d%lc%d", 0, 0, 0, 0, 0, 0,
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0, 0, L'x', 1);
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ASSERT_EQ(i, 10);
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ASSERT_STREQ(buf, "00000000x1");
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memset(buf, 0, sizeof(buf));
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i = snprintf(buf, sizeof(buf), "%d%d%d%d%d%d%d%d%C%d", 0, 0, 0, 0, 0, 0, 0, 0,
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L'x', 1);
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ASSERT_EQ(i, 10);
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ASSERT_STREQ(buf, "00000000x1");
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}
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