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Fix the X conversion specifier's alternative form (#788)

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The standard states that, when the # flag is used:
> The result is converted to an "alternative form". [...] For x (or X)
conversion, a nonzero result has 0x (or 0X) prefixed to it.
- C standard, 7.23.6.1. The fprintf function

cosmopolitan fails to use the correct alternative form (0X) when the X
conversion specifier is used, instead using 0x, which is not
capitalized.

This patch fixes this, along with the several tests that test for the
wrong behavior.
This commit is contained in:
Gabriel Ravier 2023-03-29 09:10:53 +02:00 • committed by GitHub
parent a412ca7a77
commit 0adefbf152
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GPG key ID: 4AEE18F83AFDEB23
4 changed files with 31 additions and 10 deletions
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21
test/libc/fmt/fmt_test.c
View file

@ -17,6 +17,7 @@
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/fmt/fmt.h"
#include "libc/limits.h"
#include "libc/log/log.h"
#include "libc/math.h"
@ -77,6 +78,26 @@ TEST(fmt, u) {
TEST(fmt, x) {
EXPECT_STREQ("0x01 ", _gc(xasprintf("%#-07.2x", 1)));
EXPECT_STREQ("0x00136d ", _gc(xasprintf("%#-010.6x", 4973)));
EXPECT_STREQ("0X1", _gc(xasprintf("%#X", 1)));
EXPECT_STREQ("0XA", _gc(xasprintf("%#X", 10)));
EXPECT_STREQ("0XFFFF", _gc(xasprintf("%#X", 65535)));
EXPECT_STREQ("0XABCDEF", _gc(xasprintf("%#X", 0xABCDEF)));
EXPECT_STREQ("0X1", _gc(xasprintf("%#hX", (short)1)));
EXPECT_STREQ("0XA", _gc(xasprintf("%#hX", (short)10)));
EXPECT_STREQ("0XFFFF", _gc(xasprintf("%#hX", (short)65535)));
EXPECT_STREQ("0XABCD", _gc(xasprintf("%#hX", (short)0xABCD)));
EXPECT_STREQ(" 0X308C6705", _gc(xasprintf("%#20X", 814507781)));
EXPECT_STREQ("0X0000000000308C6705", _gc(xasprintf("%#020X", 814507781)));
EXPECT_STREQ(" 0X6705",
_gc(xasprintf("%#20hX", (short)814507781)));
EXPECT_STREQ("0X000000000000006705",
_gc(xasprintf("%#020hX", (short)814507781)));
EXPECT_STREQ(" 0XABCDEF", _gc(xasprintf("%#20X", 0xABCDEF)));
EXPECT_STREQ("0X000000000000ABCDEF", _gc(xasprintf("%#020X", 0xABCDEF)));
EXPECT_STREQ(" 0XCDEF",
_gc(xasprintf("%#20hX", (short)0xABCDEF)));
EXPECT_STREQ("0X00000000000000CDEF",
_gc(xasprintf("%#020hX", (short)0xABCDEF)));
}
TEST(fmt, b) {

8
test/libc/fmt/palandprintf_test.c
View file

@ -310,8 +310,8 @@ TEST(sprintf, test_padding_pound_020) {
EXPECT_STREQ("00000000037777777001", Format("%#020o", 4294966785U));
EXPECT_STREQ("0x00000000001234abcd", Format("%#020x", 305441741));
EXPECT_STREQ("0x0000000000edcb5433", Format("%#020x", 3989525555U));
EXPECT_STREQ("0x00000000001234ABCD", Format("%#020X", 305441741));
EXPECT_STREQ("0x0000000000EDCB5433", Format("%#020X", 3989525555U));
EXPECT_STREQ("0X00000000001234ABCD", Format("%#020X", 305441741));
EXPECT_STREQ("0X0000000000EDCB5433", Format("%#020X", 3989525555U));
}
TEST(sprintf, test_padding_pound_20) {
@ -325,8 +325,8 @@ TEST(sprintf, test_padding_pound_20) {
EXPECT_STREQ(" 037777777001", Format("%#20o", 4294966785U));
EXPECT_STREQ(" 0x1234abcd", Format("%#20x", 305441741));
EXPECT_STREQ(" 0xedcb5433", Format("%#20x", 3989525555U));
EXPECT_STREQ(" 0x1234ABCD", Format("%#20X", 305441741));
EXPECT_STREQ(" 0xEDCB5433", Format("%#20X", 3989525555U));
EXPECT_STREQ(" 0X1234ABCD", Format("%#20X", 305441741));
EXPECT_STREQ(" 0XEDCB5433", Format("%#20X", 3989525555U));
}
TEST(sprintf, test_padding_20_point_5) {