[PATCH v4 1/6] util: Add helper function to clean extra spaces

[Jai Singh Rana <JaiSingh.Rana@xxxxxxxxxx>]

This patch adds string manupulation helper function which takes
string as input and returns string with all but one space removed
between letters, numbers or words.

Signed-off-by: Jai Singh Rana <JaiSingh.Rana@xxxxxxxxxx>
---
 src/libvirt_private.syms |  1 +
 src/util/virstring.c     | 36 ++++++++++++++++++++++++++++++++++++
 src/util/virstring.h     |  3 +++
 3 files changed, 40 insertions(+)

diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index 5499a368c0..272e7426dd 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -2891,6 +2891,7 @@ virSkipSpacesBackwards;
 virStrcpy;
 virStrdup;
 virStringBufferIsPrintable;
+virStringCleanExtraSpaces;
 virStringEncodeBase64;
 virStringFilterChars;
 virStringHasChars;
diff --git a/src/util/virstring.c b/src/util/virstring.c
index 15f367af7c..1f45b2b553 100644
--- a/src/util/virstring.c
+++ b/src/util/virstring.c
@@ -139,6 +139,42 @@ virStringSplit(const char *string,
 
 
 /**
+ * virCleanExtraSpacesInString:
+ * @src: original null terminated string
+ *
+ * Returns string with all spaces but one removed between words in @src
+ * string. Caller is responsible for freeing the returned string.
+ * Returns NULL if new string could not be allocated.
+ *
+ */
+char *
+virStringCleanExtraSpaces(char *src)
+{
+    char *dst;
+    size_t dstlen;
+    int src_at = 0;
+    int dst_at;
+
+    dstlen = strlen(src);
+    if (VIR_ALLOC_N(dst, dstlen) < 0)
+        return NULL;
+
+    while (src[src_at] == ' ')
+        src_at++;
+
+    for (dst_at = 0; src[src_at] != '\0'; src_at++) {
+        if (src[src_at + 1] == ' ' && src[src_at] == ' ')
+            continue;
+        dst[dst_at] = src[src_at];
+        dst_at++;
+    }
+    dst[dst_at] = '\0';
+
+    return dst;
+}
+
+
+/**
  * virStringListJoin:
  * @strings: a NULL-terminated array of strings to join
  * @delim: a string to insert between each of the strings
diff --git a/src/util/virstring.h b/src/util/virstring.h
index 607ae66e99..0778bc45c8 100644
--- a/src/util/virstring.h
+++ b/src/util/virstring.h
@@ -37,6 +37,9 @@ char **virStringSplit(const char *string,
                       size_t max_tokens)
     ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2);
 
+char *virStringCleanExtraSpaces(char *src)
+    ATTRIBUTE_NONNULL(1);
+
 char *virStringListJoin(const char **strings,
                         const char *delim)
     ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2);
-- 
2.13.7

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