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printf: do not print garbage on "%Ld". closes bug 4214.

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function                                             old     new   delta
printf_main                                          633     637      +4
multiconvert                                          99      79     -20
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/1 up/down: 4/-20)             Total: -16 bytes
This commit is contained in:
Denis Vlasenko 2008-07-18 18:41:55 +00:00
parent f19817ddc2
commit 5f116629d8
2 changed files with 20 additions and 6 deletions
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21
coreutils/printf.c
View File

@ -63,11 +63,8 @@ typedef void FAST_FUNC (*converter)(const char *arg, void *result);
static int multiconvert(const char *arg, void *result, converter convert)
{
char s[sizeof(int)*3 + 2];
if (*arg == '"' || *arg == '\'') {
sprintf(s, "%d", (unsigned char)arg[1]);
arg = s;
arg = utoa((unsigned char)arg[1]);
}
errno = 0;
convert(arg, result);
@ -289,10 +286,22 @@ static char **print_formatted(char *f, char **argv)
}
}
}
/* Remove size modifiers - "%Ld" would try to printf
* long long, we pass long, and it spews garbage */
if ((*f | 0x20) == 'l' || *f == 'h' || *f == 'z') {
++f;
++direc_length;
strcpy(f, f + 1);
}
//FIXME: actually, the same happens with bare "%d":
//it printfs an int, but we pass long!
//What saves us is that on most arches stack slot
//is pointer-sized -> long-sized -> ints are promoted to longs
// for variadic functions -> printf("%d", int_v) is in reality
// indistinqushable from printf("%d", long_v) ->
// since printf("%d", int_v) works, printf("%d", long_v) has to work.
//But "clean" solution would be to add "l" to d,i,o,x,X.
//Probably makes sense to go all the way to "ll" then.
//Coreutils support long long-sized arguments.
/* needed - try "printf %" without it */
if (!strchr("diouxXfeEgGcs", *f)) {
bb_error_msg("%s: invalid format", direc_start);

5
testsuite/printf.tests
View File

@ -74,6 +74,11 @@ testing "printf understands %ld" \
"-5\n""0\n" \
"" ""
testing "printf understands %Ld" \
"${bb}printf '%Ld\n' -5 2>&1; echo \$?" \
"-5\n""0\n" \
"" ""
# We are "more correct" here than bash/coreutils: they happily print -2
# as if it is a huge unsigned number
testing "printf handles %u -N" \