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Fix padding+minus flag on numbers for printf-family functions (#787)

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The C standard states, for conversions using the d, i, b, B, o, u, x or X conversion specifiers:
> The precision specifies the minimum number of digits to appear; if
> the value being converted can be represented in fewer digits, it is
> expanded with leading zeros.
- C standard, 7.23.6.1. The fprintf function

However, cosmopolitan currently suppresses the addition of leading
zeros when the minus flag is set. This is not reflected by anything
within the C standard, meaning that behavior is incorrect.

This patch fixes this.
This commit is contained in:
Gabriel Ravier 2023-03-25 19:39:25 +01:00 • committed by GitHub
parent 2d6ea2fbc9
commit 792b1c84c0
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2 changed files with 30 additions and 13 deletions
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19
test/libc/fmt/fmt_test.c
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@ -62,6 +62,25 @@ TEST(fmt, d) {
EXPECT_STREQ(" 16", _gc(xasprintf("% d", 16)));
EXPECT_STREQ(" 2147483647", _gc(xasprintf("% d", INT_MAX)));
EXPECT_STREQ("-2147483648", _gc(xasprintf("% d", INT_MIN)));
EXPECT_STREQ("042 ", _gc(xasprintf("%-4.3d", 42)));
EXPECT_STREQ("-00054", _gc(xasprintf("%-1.5lld", -54ll)));
EXPECT_STREQ("00109", _gc(xasprintf("%-.5lld", 109ll)));
EXPECT_STREQ("-00116", _gc(xasprintf("%-.5lld", -116ll)));
EXPECT_STREQ("00108 ", _gc(xasprintf("%-8.5lld", 108ll)));
EXPECT_STREQ("-00054 ", _gc(xasprintf("%-8.5lld", -54ll)));
}
TEST(fmt, u) {
EXPECT_STREQ("042 ", _gc(xasprintf("%-4.3u", 42)));
}
TEST(fmt, x) {
EXPECT_STREQ("0x01 ", _gc(xasprintf("%#-07.2x", 1)));
EXPECT_STREQ("0x00136d ", _gc(xasprintf("%#-010.6x", 4973)));
}
TEST(fmt, b) {
EXPECT_STREQ("000010100 ", _gc(xasprintf("%-14.9b", 20)));
}
TEST(fmt, s) {