[libvirt] [PATCH 5/6] util: add virNumToStr

[Sri Ramanujam]

Add virNumToStr(), which safely converts numbers into their string
representation.

Functions added:
* virNumToStr_l
* virNumToStr_ul
---
 src/util/virstring.c | 34 ++++++++++++++++++++++++++++++++++
 src/util/virstring.h |  8 ++++++++
 2 files changed, 42 insertions(+)

diff --git a/src/util/virstring.c b/src/util/virstring.c
index 69abc26..f0d9e19 100644
--- a/src/util/virstring.c
+++ b/src/util/virstring.c
@@ -536,6 +536,40 @@ virStrToDouble(char const *s,
     return 0;
 }
 
+/**
+ * Converts signed number to string representation. The caller is responsible
+ * for freeing the result.
+ */
+int
+virNumToStr_l(long num, char **dst)
+{
+    int sz;
+
+    sz = snprintf(NULL, 0, "%ld", num);
+    if (sz > 0 && VIR_ALLOC_N(*dst, sz + 1) < 0)
+        return -1;
+
+    snprintf(*dst, sz + 1, "%ld", num);
+    return 0;
+}
+
+/**
+ * Converts unsigned number to string representation. The caller is responsible
+ * for freeing the result.
+ */
+int
+virNumToStr_ul(unsigned long num, char **dst)
+{
+    int sz;
+
+    sz = snprintf(NULL, 0, "%lu", num);
+    if (sz > 0 && VIR_ALLOC_N(*dst, sz + 1) < 0)
+        return -1;
+
+    snprintf(*dst, sz + 1, "%lu", num);
+    return 0;
+}
+
 int
 virVasprintfInternal(bool report,
                      int domcode,
diff --git a/src/util/virstring.h b/src/util/virstring.h
index 603650a..9918e07 100644
--- a/src/util/virstring.h
+++ b/src/util/virstring.h
@@ -109,6 +109,13 @@ int virStrToDouble(char const *s,
                    double *result)
     ATTRIBUTE_RETURN_CHECK;
 
+int virNumToStr_l(long num,
+                  char **dst)
+    ATTRIBUTE_RETURN_CHECK;
+int virnumToStr_ul(unsigned long num,
+                    char **dst)
+    ATTRIBUTE_RETURN_CHECK;
+
 void virSkipSpaces(const char **str) ATTRIBUTE_NONNULL(1);
 void virSkipSpacesAndBackslash(const char **str) ATTRIBUTE_NONNULL(1);
 void virTrimSpaces(char *str, char **endp) ATTRIBUTE_NONNULL(1);
@@ -288,6 +295,7 @@ bool virStringBufferIsPrintable(const uint8_t *buf, size_t buflen);
 
 char *virStringEncodeBase64(const uint8_t *buf, size_t buflen);
 
+
 static inline void
 virStringTrimOptionalNewline(char *str)
 {
-- 
2.9.3