Add __archive_strappend_int to format a decimal

number into a variable-length archive_string.

2 files changed, 19 insertions, 0 deletions

diff --git a/lib/libarchive/archive_string.c b/lib/libarchive/archive_string.c
index 0e92836..b18f31d 100644
--- a/lib/libarchive/archive_string.c
+++ b/lib/libarchive/archive_string.c
@@ -96,3 +96,18 @@ __archive_strappend_char(struct archive_string *as, char c)
 {
 	return (__archive_string_append(as, &c, 1));
 }
+
+struct archive_string *
+__archive_strappend_int(struct archive_string *as, int d, int base)
+{
+	static const char *digits = "0123457890abcdef";
+
+	if (d < 0) {
+		__archive_strappend_char(as, '-');
+		d = -d;
+	}
+	if (d >= base)
+		__archive_strappend_int(as, d/base, base);
+	__archive_strappend_char(as, digits[d % base]);
+	return (as);
+}
diff --git a/lib/libarchive/archive_string.h b/lib/libarchive/archive_string.h
index 79597df..f4e8b76 100644
--- a/lib/libarchive/archive_string.h
+++ b/lib/libarchive/archive_string.h
@@ -64,6 +64,10 @@ struct archive_string *
 __archive_strappend_char_UTF8(struct archive_string *, int);
 #define	archive_strappend_char_UTF8 __archive_strappend_char_UTF8
 
+/* Append an integer in the specified base (2 <= base <= 16). */
+struct archive_string *
+__archive_strappend_int(struct archive_string *as, int d, int base);
+
 /* Basic append operation. */
 struct archive_string *
 __archive_string_append(struct archive_string *as, const char *p, size_t s);