evil: add strsep function.

Signed-off-by: Cedric Bail <cedric.bail@samsung.com>

2 files changed, 68 insertions, 3 deletions

diff --git a/src/lib/evil/evil_string.c b/src/lib/evil/evil_string.c
index 491a880e1a..c6d017aa4f 100644
--- a/src/lib/evil/evil_string.c
+++ b/src/lib/evil/evil_string.c
@@ -127,3 +127,48 @@ char *strcasestr(const char *haystack, const char *needle)
 
    return NULL;
 }
+
+char *
+strsep (char **stringp, const char *delim)
+{
+  char *begin, *end;
+
+  begin = *stringp;
+  if (begin == NULL)
+    return NULL;
+
+  /* A frequent case is when the delimiter string contains only one
+     character.  Here we don't need to call the expensive `strpbrk'
+     function and instead work using `strchr'.  */
+  if (delim[0] == '\0' || delim[1] == '\0')
+    {
+      char ch = delim[0];
+
+      if (ch == '\0')
+        end = NULL;
+      else
+        {
+          if (*begin == ch)
+            end = begin;
+          else if (*begin == '\0')
+            end = NULL;
+          else
+            end = strchr (begin + 1, ch);
+        }
+    }
+  else
+    /* Find the end of the token.  */
+    end = strpbrk (begin, delim);
+
+  if (end)
+    {
+      /* Terminate the token and set *STRINGP past NUL character.  */
+      *end++ = '\0';
+      *stringp = end;
+    }
+  else
+    /* No more delimiters; this is the last token.  */
+    *stringp = NULL;
+
+  return begin;
+}
diff --git a/src/lib/evil/evil_string.h b/src/lib/evil/evil_string.h
index 45c9de3638..14f49b1c94 100644
--- a/src/lib/evil/evil_string.h
+++ b/src/lib/evil/evil_string.h
@@ -144,10 +144,30 @@ EAPI int strcasecmp(const char *s1, const char *s2);
  */
 EAPI char *strcasestr(const char *haystack, const char *needle);
 
-
 /**
- * @}
- */
+ * @brief Implements the strsep function which is used to separate strings.
+ *
+ * @param stringp The pointer to the string to search in.
+ * @param delim The delimiter that contains characters used to find the next token.
+ * @return a pointer to the next token or NULL;
+ *
+ * The strsep() function locates, in the string referenced by *stringp, the
+ * first occurrence of any character in the string delim (or the terminating
+ * `\0' character) and replaces it with a `\0'.  The location of the next
+ * character after the delimiter character (or NULL, if the end of the
+ * string was reached) is stored in *stringp.  The original value of
+ * stringp is returned.
+ *
+ * An ``empty'' field (i.e., a character in the string delim occurs as the
+ * first character of *stringp) can be detected by comparing the location
+ * referenced by the returned pointer to `\0'.
 
+ * If *stringp is initially NULL, strsep() returns NULL.
+ *
+ * This function is from LibGW32C.
+ * @since 1.8
+ *
+ */
+EAPI char *strsep(char **stringp, const char *delim);
 
 #endif /* __EVIL_STRING_H__ */