From 11dacb96ec2207cfc19017e658920b5a0bd43901 Mon Sep 17 00:00:00 2001
From: Donald Buczek <buczek@molgen.mpg.de>
Date: Fri, 16 Oct 2015 15:08:25 +0200
Subject: [PATCH] mx_util: Add mx_strvec_join()

---
 mx_util.c      | 34 ++++++++++++++++++++++++++++++++++
 mx_util.h      |  1 +
 test_mx_util.c | 26 ++++++++++++++++++++++++++
 3 files changed, 61 insertions(+)

diff --git a/mx_util.c b/mx_util.c
index 14d294c..e79e467 100644
--- a/mx_util.c
+++ b/mx_util.c
@@ -1170,3 +1170,37 @@ char **mx_strvec_from_str(char *str)
 
     return strvec;
 }
+
+char *mx_strvec_join(char *sep,char **strvec)
+{
+    int elements=0;
+    int len=0;
+    char *out;
+    char *in;
+    char *p;
+    int i;
+
+    for (i=0;(in=strvec[i]);i++) {
+        elements++;
+        len+=strlen(in);
+    }
+    if (elements==0) return mx_strdup_forever("");
+    len+=strlen(sep)*(elements-1);
+    out=mx_malloc_forever(len+1);
+    p=out;
+
+    for (i=0;i<elements-1;i++) {
+        in=strvec[i];
+        while (*in)
+            *p++ = *in++;
+	in=sep;
+        while (*in)
+            *p++ = *in++;
+    }
+    in=strvec[i];
+    while (*in)
+        *p++ = *in++;
+    in=sep;
+    *p='\0';
+    return(out);
+}
diff --git a/mx_util.h b/mx_util.h
index f8585fe..9ab0ee5 100644
--- a/mx_util.h
+++ b/mx_util.h
@@ -190,5 +190,6 @@ int    mx_strvec_push_strvec(char*** strvecp, char **strvec);
 char*  mx_strvec_to_str(char **strvec);
 char** mx_strvec_from_str(char *str);
 void   mx_strvec_free(char **strvec);
+char*  mx_strvec_join(char *sep,char **strvec);
 
 #endif
diff --git a/test_mx_util.c b/test_mx_util.c
index b4ef240..f89135c 100644
--- a/test_mx_util.c
+++ b/test_mx_util.c
@@ -358,11 +358,37 @@ static void test_mx_strscan(void)
 
 static void test_mx_strvec() {
     char **strvec;
+    char *str;
 
     strvec=mx_strvec_new();
     mx_strvec_push_str(&strvec,strdup("Hallo"));
     mx_strvec_push_str(&strvec,strdup("Bla"));
     mx_strvec_push_str(&strvec,strdup("lall"));
+
+    assert(str=mx_strvec_join("XXX",strvec));
+    assert(strcmp(str,"HalloXXXBlaXXXlall")==0);
+    free(str);
+    assert(str=mx_strvec_join("",strvec));
+    assert(strcmp(str,"HalloBlalall")==0);
+    free(str);
+    mx_strvec_free(strvec);
+
+    strvec=mx_strvec_new();
+    assert(str=mx_strvec_join("XXX",strvec));
+    assert(strcmp(str,"")==0);
+    free(str);
+    mx_strvec_push_str(&strvec,strdup("A"));
+    assert(str=mx_strvec_join("x",strvec));
+    assert(strcmp(str,"A")==0);
+    free(str);
+    mx_strvec_push_str(&strvec,strdup(""));
+    assert(str=mx_strvec_join("x",strvec));
+    assert(strcmp(str,"Ax")==0);
+    free(str);
+    mx_strvec_push_str(&strvec,strdup("B"));
+    assert(str=mx_strvec_join("x",strvec));
+    assert(strcmp(str,"AxxB")==0);
+    free(str);
     mx_strvec_free(strvec);
 }