[PATCH 1/4] lib: add ascii hex helper functions

Harvey Harrison
2008-05-01T20:50:57Z

Everyone rolls their own version around the tree, centralize
in lib/hexdump.c

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
---
include/linux/kernel.h | 6 +++++-
lib/hexdump.c | 25 +++++++++++++++++++++++--
2 files changed, 28 insertions(+), 3 deletions(-)

diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 4d46e29..20cae9a 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -276,7 +276,11 @@ extern void print_hex_dump(const char *level, const char *prefix_str,
const void *buf, size_t len, bool ascii);
extern void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
const void *buf, size_t len);
-#define hex_asc(x) "0123456789abcdef"[x]
+
+extern const char hex_asc[];
+extern int hex_to_int(char c);
+#define hex_asc_lo(x) hex_asc[((x) & 0x0f)]
+#define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4]

#define pr_emerg(fmt, arg...) \
printk(KERN_EMERG fmt, ##arg)
diff --git a/lib/hexdump.c b/lib/hexdump.c
index 3435465..3f96e76 100644
--- a/lib/hexdump.c
+++ b/lib/hexdump.c
@@ -12,6 +12,27 @@
#include <linux/kernel.h>
#include <linux/module.h>

+const char hexasc[16] = "0123456789abcdef";
+
+/**
+ * hex_to_int - convert a single hex ASCII char to an integer value
+ * @ch: char to convert, not case sensitive [a-f][A-F][0-9]
+ *
+ * Returns -1 if the char is not a valid hexadecimal character
+ */
+int hex_to_int(char ch)
+{
+ /*
+ * Make ch lower-case, works only for digits and letters
+ */
+ ch |= 0x20;
+ if (ch >= 'a' && ch <= 'f')
+ return ch - 'a' + 10;
+ if (ch >= '0' && ch <= '9')
+ return ch - '0';
+ return -1;
+}
+
/**
* hex_dump_to_buffer - convert a blob of data to "hex ASCII" in memory
* @buf: data blob to dump
@@ -93,8 +114,8 @@ void hex_dump_to_buffer(const void *buf, size_t len, int rowsize,
for (j = 0; (j < rowsize) && (j < len) && (lx + 4) < linebuflen;
j++) {
ch = ptr[j];
- linebuf[lx++] = hex_asc(ch >> 4);
- linebuf[lx++] = hex_asc(ch & 0x0f);
+ linebuf[lx++] = hex_asc_hi(ch);
+ linebuf[lx++] = hex_asc_lo(ch);
linebuf[lx++] = ' ';
}
ascii_column = 3 * rowsize + 2;
--
1.5.5.1.305.g7c84