mirror of
https://github.com/jart/cosmopolitan.git
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c66abd7260
The C Standard specifies that, when a conversion specification specifies a conversion specifier of n, the type of the passed pointer is specified by the length modifier (if any), i.e. that e.g. the argument for %hhn is of type signed char *, but Cosmopolitan currently does not handle this - instead always simply assuming that the pointer always points to an int. This patch implements, and tests, length modifiers with the n conversion specifier, with the tests testing all of the available length modifiers.
187 lines
6.5 KiB
C
187 lines
6.5 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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static void check_n_buffer_contents(char buf[350]) {
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for (int i = 0; i < 284; ++i)
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ASSERT_EQ(buf[i], ' ');
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ASSERT_STREQ(&buf[284], "428463");
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for (int i = 290; i < 350; ++i)
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ASSERT_EQ(buf[i], '\0');
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}
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TEST(snprintf, testNConversionSpecifier) {
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char buf[350] = {};
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int n_res_int = -1;
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int i = snprintf(buf, sizeof(buf), "%286d%d%n%d", 42, 84, &n_res_int, 63);
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ASSERT_EQ(i, 290);
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check_n_buffer_contents(buf);
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ASSERT_EQ(n_res_int, 288);
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memset(&buf, '\0', sizeof(buf));
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long n_res_long = -1;
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i = snprintf(buf, sizeof(buf), "%286ld%ld%ln%ld", 42L, 84L, &n_res_long, 63L);
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ASSERT_EQ(i, 290);
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check_n_buffer_contents(buf);
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ASSERT_EQ(n_res_long, 288);
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memset(&buf, '\0', sizeof(buf));
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long long n_res_long_long = -1;
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i = snprintf(buf, sizeof(buf), "%286lld%lld%lln%lld", 42LL, 84LL,
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&n_res_long_long, 63LL);
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ASSERT_EQ(i, 290);
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check_n_buffer_contents(buf);
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ASSERT_EQ(n_res_long_long, 288);
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ASSERT_EQ(sizeof(short), 2);
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ASSERT_EQ(sizeof(int), 4);
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memset(&buf, '\0', sizeof(buf));
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short n_res_short = -1;
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i = snprintf(buf, sizeof(buf), "%286hd%hd%hn%hd", (42 | 0xFFFF0000),
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(84 | 0xFFFF0000), &n_res_short, (63 | 0xFFFF0000));
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ASSERT_EQ(i, 290);
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check_n_buffer_contents(buf);
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ASSERT_EQ(n_res_short, 288);
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ASSERT_EQ(sizeof(unsigned char), 1);
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memset(&buf, '\0', sizeof(buf));
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signed char n_res_char = -1;
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i = snprintf(buf, sizeof(buf), "%286hhd%hhd%hhn%hhd", (42 | 0xFFFFFF00),
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(84 | 0xFFFFFF00), &n_res_char, (63 | 0xFFFFFF00));
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ASSERT_EQ(i, 290);
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check_n_buffer_contents(buf);
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ASSERT_EQ(n_res_char, (signed char)288);
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memset(&buf, '\0', sizeof(buf));
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ssize_t n_res_size_t = -1;
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i = snprintf(buf, sizeof(buf), "%286zd%zd%zn%zd", (ssize_t)42, (ssize_t)84,
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&n_res_size_t, (ssize_t)63);
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ASSERT_EQ(i, 290);
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check_n_buffer_contents(buf);
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ASSERT_EQ(n_res_size_t, 288);
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memset(&buf, '\0', sizeof(buf));
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intmax_t n_res_intmax_t = -1;
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i = snprintf(buf, sizeof(buf), "%286jd%jd%jn%jd", (intmax_t)42, (intmax_t)84,
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&n_res_intmax_t, (intmax_t)63);
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ASSERT_EQ(i, 290);
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check_n_buffer_contents(buf);
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ASSERT_EQ(n_res_intmax_t, 288);
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memset(&buf, '\0', sizeof(buf));
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int128_t n_res_int128_t = -1;
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i = snprintf(buf, sizeof(buf), "%286jjd%jjd%jjn%jjd", (int128_t)42,
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(int128_t)84, &n_res_int128_t, (int128_t)63);
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ASSERT_EQ(i, 290);
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check_n_buffer_contents(buf);
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ASSERT_EQ(n_res_int128_t, 288);
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memset(&buf, '\0', sizeof(buf));
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ptrdiff_t n_res_ptrdiff_t = -1;
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i = snprintf(buf, sizeof(buf), "%286td%td%tn%td", (ptrdiff_t)42,
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(ptrdiff_t)84, &n_res_ptrdiff_t, (ptrdiff_t)63);
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ASSERT_EQ(i, 290);
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check_n_buffer_contents(buf);
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ASSERT_EQ(n_res_ptrdiff_t, 288);
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}
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