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authorUwe Hermann <uwe@hermann-uwe.de>2008-04-11 18:38:04 +0000
committerUwe Hermann <uwe@hermann-uwe.de>2008-04-11 18:38:04 +0000
commitb103345a14cf3fe28f32573833dd06af66dfadaf (patch)
tree627608743b7207b63db88167a40d1dc73e1b548b /payloads/libpayload/libc
parentfad8c2bd7ca3605fdae3548b8a932aa309871931 (diff)
downloadcoreboot-b103345a14cf3fe28f32573833dd06af66dfadaf.tar.xz
Convert BIN2HEX/HEX2BIN to functions and add the abs() family
of functions while we're at it. hex2bin() now also supports upper-case input characters. Signed-off-by: Uwe Hermann <uwe@hermann-uwe.de> Acked-by: Jordan Crouse <jordan.crouse@amd.com> git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3235 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
Diffstat (limited to 'payloads/libpayload/libc')
-rw-r--r--payloads/libpayload/libc/lib.c52
1 files changed, 52 insertions, 0 deletions
diff --git a/payloads/libpayload/libc/lib.c b/payloads/libpayload/libc/lib.c
index 9200455a8a..e7eed68eb6 100644
--- a/payloads/libpayload/libc/lib.c
+++ b/payloads/libpayload/libc/lib.c
@@ -27,6 +27,8 @@
* SUCH DAMAGE.
*/
+#include <libpayload.h>
+
/*
* Convert a number in BCD format to decimal.
*
@@ -49,3 +51,53 @@ int dec2bcd(int d)
return ((d / 10) << 4) | (d % 10);
}
+/**
+ * Return the absolute value of the specified integer.
+ *
+ * @param val The integer of which we want to know the absolute value.
+ * @return The absolute value of the specified integer.
+ */
+int abs(int j)
+{
+ return (j >= 0 ? j : -j);
+}
+
+long int labs(long int j)
+{
+ return (j >= 0 ? j : -j);
+}
+
+long long int llabs(long long int j)
+{
+ return (j >= 0 ? j : -j);
+}
+
+/**
+ * Given a 4-bit value, return the ASCII hex representation of it.
+ *
+ * @param b A 4-bit value which shall be converted to ASCII hex.
+ * @return The ASCII hex representation of the specified 4-bit value.
+ * Returned hex-characters will always be lower-case (a-f, not A-F).
+ */
+u8 bin2hex(u8 b)
+{
+ return (b < 10) ? '0' + b : 'a' + (b - 10);
+}
+
+/**
+ * Given an ASCII hex input character, return its integer value.
+ *
+ * For example, the input value '6' will be converted to 6, 'a'/'A' will
+ * be converted to 10, 'f'/'F' will be converted to 15, and so on.
+ *
+ * The return value for invalid input characters is 0.
+ *
+ * @param h The input byte in ASCII hex format.
+ * @return The integer value of the specified ASCII hex byte.
+ */
+u8 hex2bin(u8 h)
+{
+ return (('0' <= h && h <= '9') ? (h - '0') : \
+ ('A' <= h && h <= 'F') ? (h - 'A' + 10) : \
+ ('a' <= h && h <= 'f') ? (h - 'a' + 10) : 0);
+}