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localedef: Use initializer for flexible array member [BZ #24950]

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struct charseq used a zero-length array instead of a flexible array
member.  This required a strange construct to initialize struct
charseq objects, and GCC 10 warns about that:

cc1: error: writing 1 byte into a region of size 0 [-Werror=stringop-overflow=]
In file included from programs/repertoire.h:24,
                 from programs/localedef.h:32,
                 from programs/ld-ctype.c:35:
programs/charmap.h:63:17: note: destination object declared here
   63 |   unsigned char bytes[0];
      |                 ^~~~~
cc1: error: writing 1 byte into a region of size 0 [-Werror=stringop-overflow=]
programs/charmap.h:63:17: note: destination object declared here
cc1: error: writing 1 byte into a region of size 0 [-Werror=stringop-overflow=]
programs/charmap.h:63:17: note: destination object declared here
cc1: error: writing 1 byte into a region of size 0 [-Werror=stringop-overflow=]
programs/charmap.h:63:17: note: destination object declared here

The change makes the object physically const, but it is not expected
to be modified.
This commit is contained in:
Florian Weimer 2019-09-03 14:01:39 +02:00
parent 9a1e7257a4
commit 1471fa556a
3 changed files with 15 additions and 7 deletions
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8
ChangeLog
View File

@ -1,3 +1,11 @@
2019-09-03 Florian Weimer <fweimer@redhat.com>
[BZ #24950]
* locale/programs/charmap.h (struct charseq): Turn bytes into a
flexible array member.
* locale/programs/ld-ctype.c (ctype_finish): Use initializer for
replace.
2019-09-02 Florian Weimer <fweimer@redhat.com>
* misc/tst-mntent-autofs.c: New file.

2
locale/programs/charmap.h
View File

@ -60,7 +60,7 @@ struct charseq
const char *name;
uint32_t ucs4;
int nbytes;
unsigned char bytes[0];
unsigned char bytes[];
};

12
locale/programs/ld-ctype.c
View File

@ -842,8 +842,6 @@ no input digits defined and none of the standard names in the charmap"));
for (cnt = 0; cnt < 10; ++cnt)
if (ctype->mboutdigits[cnt] == NULL)
{
static struct charseq replace[2];
if (!warned)
{
record_error (0, 0, _("\
@ -851,10 +849,12 @@ not all characters used in `outdigit' are available in the charmap"));
warned = 1;
}
replace[0].nbytes = 1;
replace[0].bytes[0] = '?';
replace[0].bytes[1] = '\0';
ctype->mboutdigits[cnt] = &replace[0];
static const struct charseq replace =
{
.nbytes = 1,
.bytes = "?",
};
ctype->mboutdigits[cnt] = (struct charseq *) &replace;
}
warned = 0;