[epiphany] Add helpers for adding and removing items from a strv

[Michael Catanzaro <mcatanzaro src gnome org>]

commit b8811db568f939a6d7cb07e6e4dc7d72ec907069
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Sun Jan 22 17:06:20 2017 -0600

    Add helpers for adding and removing items from a strv

 lib/ephy-string.c |   59 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 lib/ephy-string.h |    5 ++++
 2 files changed, 64 insertions(+), 0 deletions(-)
---
diff --git a/lib/ephy-string.c b/lib/ephy-string.c
index 69ea3a3..de44d4e 100644
--- a/lib/ephy-string.c
+++ b/lib/ephy-string.c
@@ -242,3 +242,62 @@ ephy_string_commandline_args_to_uris (char **arguments, GError **error)
 
   return args;
 }
+
+char **
+ephy_strv_append (const char * const *strv,
+                  const char         *str)
+{
+  char **new_strv;
+  char **n;
+  const char * const *s;
+  guint len;
+
+  if (g_strv_contains (strv, str))
+    return g_strdupv ((char **)strv);
+
+  /* Needs room for one more string than before, plus one for trailing NULL. */
+  len = g_strv_length ((char **)strv);
+  new_strv = g_malloc ((len + 1 + 1) * sizeof (char *));
+  n = new_strv;
+  s = strv;
+
+  while (*s != NULL) {
+    *n = g_strdup (*s);
+    n++;
+    s++;
+  }
+  new_strv[len] = g_strdup (str);
+  new_strv[len + 1] = NULL;
+
+  return new_strv;
+}
+
+char **
+ephy_strv_remove (const char * const *strv,
+                  const char         *str)
+{
+  char **new_strv;
+  char **n;
+  const char * const *s;
+  guint len;
+
+  if (!g_strv_contains (strv, str))
+    return g_strdupv ((char **)strv);
+
+  /* Needs room for one fewer string than before, plus one for trailing NULL. */
+  len = g_strv_length ((char **)strv);
+  new_strv = g_malloc ((len - 1 + 1) * sizeof (char *));
+  n = new_strv;
+  s = strv;
+
+  while (*s != NULL) {
+    if (strcmp (*s, str) != 0) {
+      *n = g_strdup (*s);
+      n++;
+    }
+    s++;
+  }
+  new_strv[len - 1] = NULL;
+
+  return new_strv;
+}
diff --git a/lib/ephy-string.h b/lib/ephy-string.h
index 614a6e1..af9edc5 100644
--- a/lib/ephy-string.h
+++ b/lib/ephy-string.h
@@ -40,5 +40,10 @@ char     *ephy_string_get_host_name            (const char *url);
 
 char    **ephy_string_commandline_args_to_uris (char **arguments, GError **error);
 
+char    **ephy_strv_append                     (const char * const *strv,
+                                                const char *str);
+char    **ephy_strv_remove                     (const char * const *strv,
+                                                const char *str);
+
 
 G_END_DECLS