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diff --git a/lib/libutil/Symbol.map b/lib/libutil/Symbol.map
--- a/lib/libutil/Symbol.map
+++ b/lib/libutil/Symbol.map
@@ -13,6 +13,7 @@
cpuset_parselist;
domainset_parselist;
expand_number;
+ expand_unsigned;
flopen;
flopenat;
forkpty;
diff --git a/lib/libutil/expand_number.3 b/lib/libutil/expand_number.3
--- a/lib/libutil/expand_number.3
+++ b/lib/libutil/expand_number.3
@@ -24,11 +24,12 @@
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
-.Dd July 25, 2025
+.Dd August 6, 2025
.Dt EXPAND_NUMBER 3
.Os
.Sh NAME
-.Nm expand_number
+.Nm expand_number ,
+.Nm expand_unsigned
.Nd parse a number from human readable form
.Sh LIBRARY
.Lb libutil
@@ -38,6 +39,10 @@
.Fo expand_number
.Fa "const char *buf" "int64_t *num"
.Fc
+.Ft int
+.Fo expand_unsigned
+.Fa "const char *buf" "uint64_t *num"
+.Fc
.Sh DESCRIPTION
The
.Fn expand_number
@@ -48,6 +53,17 @@
.Fa *num
argument.
.Pp
+The
+.Fn expand_unsigned
+function is similar to
+.Fn expand_number ,
+but accepts only positive numbers in the range
+.Bq 0, Ns Dv UINT64_MAX .
+.Pp
+Both functions interpret the input
+.Dq -0
+as 0.
+.Pp
The input string must consist of a decimal number, optionally preceded
by a
.Sq +
@@ -81,20 +97,38 @@
.Dq 5kb
is interpreted as 5,120).
However, the usage of this suffix is discouraged.
+.Pp
+For backward compatibility reasons, if the compiler supports generic
+selection, a macro is provided which automatically replaces calls to
+.Fn expand_number
+with calls to
+.Fn expand_unsigned
+if the type of the actual
+.Va num
+argument is compatible with
+.Vt uint64_t * .
.Sh RETURN VALUES
.Rv -std
.Sh ERRORS
The
.Fn expand_number
-function will fail if:
+and
+.Fn expand_unsigned
+functions will fail if:
.Bl -tag -width Er
.It Bq Er EINVAL
The given string does not contain a valid number.
.It Bq Er EINVAL
An unrecognized suffix was encountered.
.It Bq Er ERANGE
-The given string represents a number which does not fit into a
-.Vt int64_t .
+The given string represents a number which does not fit into an
+.Vt int64_t
+(for
+.Fn expand_number )
+or
+.Vt uint64_t
+(for
+.Fn expand_unsigned ) .
.El
.Sh SEE ALSO
.Xr humanize_number 3
@@ -103,3 +137,17 @@
.Fn expand_number
function first appeared in
.Fx 6.3 .
+The original implementation did not handle negative numbers correctly,
+and it was switched to taking a
+.Vt uint64_t *
+and accepting only positive numbers in
+.Fx 9.0 .
+The
+.Fn expand_unsigned
+function was added,
+and
+.Fn expand_number
+switched back to
+.Vt int64_t * ,
+in
+.Fx 15.0 .
diff --git a/lib/libutil/expand_number.c b/lib/libutil/expand_number.c
--- a/lib/libutil/expand_number.c
+++ b/lib/libutil/expand_number.c
@@ -37,13 +37,12 @@
#include <stdbool.h>
#include <stdint.h>
-int
-expand_number(const char *buf, int64_t *num)
+static int
+expand_impl(const char *buf, uint64_t *num, bool *neg)
{
char *endptr;
uintmax_t number;
unsigned int shift;
- bool neg;
int serrno;
/*
@@ -52,10 +51,10 @@
while (isspace((unsigned char)*buf))
buf++;
if (*buf == '-') {
- neg = true;
+ *neg = true;
buf++;
} else {
- neg = false;
+ *neg = false;
if (*buf == '+')
buf++;
}
@@ -127,6 +126,22 @@
}
number <<= shift;
+ *num = number;
+ return (0);
+}
+
+int
+(expand_number)(const char *buf, int64_t *num)
+{
+ uint64_t number;
+ bool neg;
+
+ /*
+ * Parse the number.
+ */
+ if (expand_impl(buf, &number, &neg) != 0)
+ return (-1);
+
/*
* Apply the sign and check for overflow.
*/
@@ -146,3 +161,27 @@
return (0);
}
+
+int
+expand_unsigned(const char *buf, uint64_t *num)
+{
+ uint64_t number;
+ bool neg;
+
+ /*
+ * Parse the number.
+ */
+ if (expand_impl(buf, &number, &neg) != 0)
+ return (-1);
+
+ /*
+ * Negative numbers are out of range.
+ */
+ if (neg && number > 0) {
+ errno = ERANGE;
+ return (-1);
+ }
+
+ *num = number;
+ return (0);
+}
diff --git a/lib/libutil/libutil.h b/lib/libutil/libutil.h
--- a/lib/libutil/libutil.h
+++ b/lib/libutil/libutil.h
@@ -89,6 +89,14 @@
void clean_environment(const char * const *_white,
const char * const *_more_white);
int expand_number(const char *_buf, int64_t *_num);
+int expand_unsigned(const char *_buf, uint64_t *_num);
+#if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L) || \
+ __has_extension(c_generic_selections)
+#define expand_number(_buf, _num) \
+ _Generic((_num), \
+ uint64_t *: expand_unsigned, \
+ default: expand_number)((_buf), (_num))
+#endif
int extattr_namespace_to_string(int _attrnamespace, char **_string);
int extattr_string_to_namespace(const char *_string, int *_attrnamespace);
int flopen(const char *_path, int _flags, ...);
diff --git a/lib/libutil/tests/expand_number_test.c b/lib/libutil/tests/expand_number_test.c
--- a/lib/libutil/tests/expand_number_test.c
+++ b/lib/libutil/tests/expand_number_test.c
@@ -206,10 +206,85 @@
require_error(" + 1", EINVAL);
}
+ATF_TC_WITHOUT_HEAD(expand_unsigned);
+ATF_TC_BODY(expand_unsigned, tp)
+{
+ static struct tc {
+ const char *str;
+ uint64_t num;
+ int error;
+ } tcs[] = {
+ { "0", 0, 0 },
+ { "+0", 0, 0 },
+ { "-0", 0, 0 },
+ { "1", 1, 0 },
+ { "+1", 1, 0 },
+ { "-1", 0, ERANGE },
+ { "18446744073709551615", UINT64_MAX, 0 },
+ { "+18446744073709551615", UINT64_MAX, 0 },
+ { "-18446744073709551615", 0, ERANGE },
+ { 0 },
+ };
+ struct tc *tc;
+ uint64_t num;
+ int error, ret;
+
+ for (tc = tcs; tc->str != NULL; tc++) {
+ ret = expand_number(tc->str, &num);
+ error = errno;
+ if (tc->error == 0) {
+ ATF_REQUIRE_EQ_MSG(0, ret,
+ "%s ret = %d", tc->str, ret);
+ ATF_REQUIRE_EQ_MSG(tc->num, num,
+ "%s num = %ju", tc->str, (uintmax_t)num);
+ } else {
+ ATF_REQUIRE_EQ_MSG(-1, ret,
+ "%s ret = %d", tc->str, ret);
+ ATF_REQUIRE_EQ_MSG(tc->error, error,
+ "%s errno = %d", tc->str, error);
+ }
+ }
+}
+
+ATF_TC_WITHOUT_HEAD(expand_generic);
+ATF_TC_BODY(expand_generic, tp)
+{
+ uint64_t uint64;
+ int64_t int64;
+ size_t size;
+ off_t off;
+
+ ATF_REQUIRE_EQ(0, expand_number("18446744073709551615", &uint64));
+ ATF_REQUIRE_EQ(UINT64_MAX, uint64);
+ ATF_REQUIRE_EQ(-1, expand_number("-1", &uint64));
+ ATF_REQUIRE_EQ(ERANGE, errno);
+
+ ATF_REQUIRE_EQ(0, expand_number("9223372036854775807", &int64));
+ ATF_REQUIRE_EQ(INT64_MAX, int64);
+ ATF_REQUIRE_EQ(-1, expand_number("9223372036854775808", &int64));
+ ATF_REQUIRE_EQ(ERANGE, errno);
+ ATF_REQUIRE_EQ(0, expand_number("-9223372036854775808", &int64));
+ ATF_REQUIRE_EQ(INT64_MIN, int64);
+
+ ATF_REQUIRE_EQ(0, expand_number("18446744073709551615", &size));
+ ATF_REQUIRE_EQ(UINT64_MAX, size);
+ ATF_REQUIRE_EQ(-1, expand_number("-1", &size));
+ ATF_REQUIRE_EQ(ERANGE, errno);
+
+ ATF_REQUIRE_EQ(0, expand_number("9223372036854775807", &off));
+ ATF_REQUIRE_EQ(INT64_MAX, off);
+ ATF_REQUIRE_EQ(-1, expand_number("9223372036854775808", &off));
+ ATF_REQUIRE_EQ(ERANGE, errno);
+ ATF_REQUIRE_EQ(0, expand_number("-9223372036854775808", &off));
+ ATF_REQUIRE_EQ(INT64_MIN, off);
+}
+
ATF_TP_ADD_TCS(tp)
{
ATF_TP_ADD_TC(tp, expand_number__ok);
ATF_TP_ADD_TC(tp, expand_number__bad);
+ ATF_TP_ADD_TC(tp, expand_unsigned);
+ ATF_TP_ADD_TC(tp, expand_generic);
return (atf_no_error());
}

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