git: 4249a9bc098d - main - rtld parse_integer(): support binary, octal, and hex C notations

The branch main has been updated by kib:

URL: https://cgit.FreeBSD.org/src/commit/?id=4249a9bc098dd9e32105a2965e76abd702de4d4a

commit 4249a9bc098dd9e32105a2965e76abd702de4d4a
Author:     Konstantin Belousov <kib@FreeBSD.org>
AuthorDate: 2026-06-12 13:55:27 +0000
Commit:     Konstantin Belousov <kib@FreeBSD.org>
CommitDate: 2026-06-14 01:01:55 +0000

    rtld parse_integer(): support binary, octal, and hex C notations
    
    Reviewed by:    des, dim
    Sponsored by:   The FreeBSD Foundation
    MFC after:      1 week
    Differential revision:  https://reviews.freebsd.org/D57549
---
 libexec/rtld-elf/rtld.c | 43 ++++++++++++++++++++++++++++++++++---------
 1 file changed, 34 insertions(+), 9 deletions(-)

diff --git a/libexec/rtld-elf/rtld.c b/libexec/rtld-elf/rtld.c
index 29984e40b574..a72726684f0f 100644
--- a/libexec/rtld-elf/rtld.c
+++ b/libexec/rtld-elf/rtld.c
@@ -6537,27 +6537,52 @@ parse_args(char *argv[], int argc, bool *use_pathp, int *fdp,
 static int
 parse_integer(const char *str)
 {
-	static const int RADIX = 10; /* XXXJA: possibly support hex? */
+	int radix;
 	const char *orig;
-	int n;
+	int n, val;
 	char c;
 
+	if (str[0] == '0') {
+		if (str[1] == 'x') {
+			str += 2;
+			radix = 16;
+		} else if (str[1] == 'b') {
+			str += 2;
+			radix = 2;
+		} else {
+			str += 1;
+			radix = 8;
+		}
+	} else {
+		radix = 10;
+	}
 	orig = str;
 	n = 0;
 	for (c = *str; c != '\0'; c = *++str) {
-		if (c < '0' || c > '9')
+		if (c >= '0' && c <= '9')
+			val = c - '0';
+		else if (c >= 'a' && c <= 'f')
+			val = c - 'a' + 10;
+		else if (c >= 'A' && c <= 'F')
+			val = c - 'A' + 10;
+		else
+			return (-1);
+		if (val >= radix)
 			return (-1);
 
-		if (n > INT_MAX / RADIX)
+		if (n > INT_MAX / radix)
 			return (-1);
-		n *= RADIX;
-		if (n > INT_MAX - (c - '0'))
+		n *= radix;
+		if (n > INT_MAX - val)
 			return (-1);
-		n += c - '0';
+		n += val;
 	}
 
-	/* Make sure we actually parsed something. */
-	if (str == orig)
+	/*
+	 * Make sure we actually parsed something.
+	 * Allow for lone '0'.
+	 */
+	if (str == orig && radix != 8)
 		return (-1);
 	return (n);
 }