[PATCH v3 04/16] Add FormatUInt64{, Hex}() for formatting numbers in a signal safe manner
Chase Douglas
chase.douglas at canonical.com
Mon Apr 16 11:14:21 PDT 2012
Signed-off-by: Chase Douglas <chase.douglas at canonical.com>
---
include/misc.h | 2 ++
os/utils.c | 40 ++++++++++++++++++++++++++++++++++++++++
2 files changed, 42 insertions(+), 0 deletions(-)
diff --git a/include/misc.h b/include/misc.h
index 41c1333..3f7d07e 100644
--- a/include/misc.h
+++ b/include/misc.h
@@ -229,6 +229,8 @@ pad_to_int32(const int bytes)
}
extern char **xstrtokenize(const char *str, const char *separators);
+extern void FormatUInt64(uint64_t num, char *string);
+extern void FormatUInt64Hex(uint64_t num, char *string);
/**
* Compare the two version numbers comprising of major.minor.
diff --git a/os/utils.c b/os/utils.c
index 9954114..12252d7 100644
--- a/os/utils.c
+++ b/os/utils.c
@@ -1784,3 +1784,43 @@ xstrtokenize(const char *str, const char *separators)
free(list);
return NULL;
}
+
+/* Format a number into a string in a signal safe manner. The string should be
+ * at least 20 characters in order to handle all uint64_t values. */
+void
+FormatUInt64(uint64_t num, char *string)
+{
+ uint64_t divisor;
+ int len;
+ int i;
+
+ for (len = 1, divisor = 10; num / divisor; len++, divisor *= 10);
+
+ for (i = len, divisor = 1; i > 0; i--, divisor *= 10)
+ string[i - 1] = '0' + ((num / divisor) % 10);
+
+ string[len] = '\0';
+}
+
+/* Format a number into a hexadecimal string in a signal safe manner. The string
+ * should be at least 17 characters in order to handle all uint64_t values. */
+void
+FormatUInt64Hex(uint64_t num, char *string)
+{
+ uint64_t divisor;
+ int len;
+ int i;
+
+ for (len = 1, divisor = 0x10; num / divisor; len++, divisor *= 0x10);
+
+ for (i = len, divisor = 1; i > 0; i--, divisor *= 0x10) {
+ int val = (num / divisor) % 0x10;
+
+ if (val < 10)
+ string[i - 1] = '0' + val;
+ else
+ string[i - 1] = 'a' + val - 10;
+ }
+
+ string[len] = '\0';
+}
--
1.7.9.1
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