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Better handling of UCNs in strings

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As the standard requires, take 4 hex digits after the \u opener of a
Universal Character Name, or take 8 hex digits after \U, but reject
smaller counts and don't consume more (https://port70.net/~nsz/c/c11/n1570.html#6.4.3,
https://port70.net/~nsz/c/c99/n1256.html#6.4.3).

The unicode codepoint used to get truncated to 1 byte. Now it gets expanded into UTF-8,
matching gcc & clang behavior on Linux.

TODO: Universal character names should also be supported in identifiers,
as in, e.g., char \u010dau_sv\u011bte[]="čau_světe";
This commit is contained in:
Petr Skocik
2021-01-17 22:21:07 +01:00
parent 6b614c4deb
commit ffb95c2e0c
2 changed files with 46 additions and 7 deletions
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9
tests/tests2/97_utf8_string_literal.c
View File

@@ -1,12 +1,19 @@
// this file contains BMP chars encoded in UTF-8
#include <stdio.h>
#include <wchar.h>
#include <stdlib.h>
#include <string.h>
int main()
{
char hello_world_in_czech[] = "čau, světe";
char hello_world_in_czech_ucn[] = "\u010dau, sv\u011bte";
if (sizeof(hello_world_in_czech) != sizeof(hello_world_in_czech_ucn)
|| strcmp(hello_world_in_czech, hello_world_in_czech_ucn))
abort();
wchar_t s[] = L"hello$$你好¢¢世界€€world";
wchar_t *p;
for (p = s; *p; p++) printf("%04X ", (unsigned) *p);
printf("\n");
return 0;
}