[PATCH 14/28] lib: Add a function to convert a string to a hex value

[Simon Glass <sjg@chromium.org>]

Add an xtoa() function, similar to itoa() but for hex instead.

Signed-off-by: Simon Glass <sjg@chromium.org>
---

 include/vsprintf.h | 16 ++++++++++++++--
 lib/vsprintf.c     | 20 ++++++++++++++++++--
 test/print_ut.c    | 16 ++++++++++++++++
 3 files changed, 48 insertions(+), 4 deletions(-)

diff --git a/include/vsprintf.h b/include/vsprintf.h
index 4479df0af3f..b4746301462 100644
--- a/include/vsprintf.h
+++ b/include/vsprintf.h
@@ -177,14 +177,26 @@ int vsprintf(char *buf, const char *fmt, va_list args);
  * simple_itoa() - convert an unsigned integer to a string
  *
  * This returns a static string containing the decimal representation of the
- * given value. The returned value may be overwritten by other calls to the
- * same function, so should be used immediately
+ * given value. The returned value may be overwritten by other calls to other
+ * simple_... functions, so should be used immediately
  *
  * @val: Value to convert
  * @return string containing the decimal representation of @val
  */
 char *simple_itoa(ulong val);
 
+/**
+ * simple_xtoa() - convert an unsigned integer to a hex string
+ *
+ * This returns a static string containing the hexadecimal representation of the
+ * given value. The returned value may be overwritten by other calls to other
+ * simple_... functions, so should be used immediately
+ *
+ * @val: Value to convert
+ * @return string containing the hexecimal representation of @val
+ */
+char *simple_xtoa(ulong num);
+
 /**
  * Format a string and place it in a buffer
  *
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index d7ee35b4773..e634bd70b66 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -816,11 +816,12 @@ int vprintf(const char *fmt, va_list args)
 }
 #endif
 
+static char local_toa[22];
+
 char *simple_itoa(ulong i)
 {
 	/* 21 digits plus null terminator, good for 64-bit or smaller ints */
-	static char local[22];
-	char *p = &local[21];
+	char *p = &local_toa[21];
 
 	*p-- = '\0';
 	do {
@@ -830,6 +831,21 @@ char *simple_itoa(ulong i)
 	return p + 1;
 }
 
+char *simple_xtoa(ulong num)
+{
+	/* 16 digits plus nul terminator, good for 64-bit or smaller ints */
+	char *p = &local_toa[17];
+
+	*--p = '\0';
+	do {
+		p -= 2;
+		hex_byte_pack(p, num & 0xff);
+		num >>= 8;
+	} while (num > 0);
+
+	return p;
+}
+
 /* We don't seem to have %'d in U-Boot */
 void print_grouped_ull(unsigned long long int_val, int digits)
 {
diff --git a/test/print_ut.c b/test/print_ut.c
index 737845afd33..13068bc619d 100644
--- a/test/print_ut.c
+++ b/test/print_ut.c
@@ -345,6 +345,22 @@ static int print_itoa(struct unit_test_state *uts)
 }
 PRINT_TEST(print_itoa, 0);
 
+static int print_xtoa(struct unit_test_state *uts)
+{
+	ut_asserteq_str("7f", simple_xtoa(127));
+	ut_asserteq_str("00", simple_xtoa(0));
+	ut_asserteq_str("7fffffff", simple_xtoa(0x7fffffff));
+	ut_asserteq_str("ffffffff", simple_xtoa(0xffffffff));
+	if (sizeof(ulong) == 8) {
+		ut_asserteq_str("7fffffffffffffff",
+				simple_xtoa((1UL << 63) - 1));
+		ut_asserteq_str("ffffffffffffffff", simple_xtoa(-1));
+	}
+
+	return 0;
+}
+PRINT_TEST(print_xtoa, 0);
+
 int do_ut_print(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 {
 	struct unit_test *tests = UNIT_TEST_SUITE_START(print_test);
-- 
2.33.0.rc1.237.g0d66db33f3-goog