[PATCH v3] lib: Improve _parse_integer_fixup_radix base 16 detection

[Michal Simek]

Base autodetection is failing for this case:
if test 257 -gt 3ae; then echo first; else echo second; fi

It is because base for 3ae is recognized by _parse_integer_fixup_radix() as
10. The code detects the first char which is not between 'a'/'A' or 'f'/'F'
to change base from dec to hex.

Signed-off-by: Michal Simek <michal.simek at xilinx.com>
Signed-off-by: Shiril Tichkule <shirilt at xlinx.com>
---

Changes in v3:
- Fix commit message to be accurate based on code.
- Use tolower instead of two ranges
- Use do while loop - all reported by Andy
- Remove Tom's reviewed-by tag because code has changed

Changes in v2:
- Fix end of string to be \0 instead of \n
- Detect hex by checking chars between a-f to avoid cases like number
  follow by ;

 lib/strto.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/lib/strto.c b/lib/strto.c
index 55ff9f7437d5..1ac2b09c725c 100644
--- a/lib/strto.c
+++ b/lib/strto.c
@@ -22,9 +22,22 @@ static const char *_parse_integer_fixup_radix(const char *s, unsigned int *base)
 				*base = 16;
 			else
 				*base = 8;
-		} else
+		} else {
+			int i = 0;
+			char var;
+
 			*base = 10;
+
+			do {
+				var = tolower(s[i++]);
+				if (var >= 'a' && var <= 'f') {
+					*base = 16;
+					break;
+				}
+			} while (var);
+		}
 	}
+
 	if (*base == 16 && s[0] == '0' && tolower(s[1]) == 'x')
 		s += 2;
 	return s;
-- 
2.25.1