Implement `strbuf_join_argv()` to join arguments
into a strbuf.

Signed-off-by: Paul-Sebastian Ungureanu <ungureanupaulsebast...@gmail.com>
---
 strbuf.c | 15 +++++++++++++++
 strbuf.h |  7 +++++++
 2 files changed, 22 insertions(+)

diff --git a/strbuf.c b/strbuf.c
index f6a6cf78b9..82e90f1dfe 100644
--- a/strbuf.c
+++ b/strbuf.c
@@ -268,6 +268,21 @@ void strbuf_addbuf(struct strbuf *sb, const struct strbuf 
*sb2)
        strbuf_setlen(sb, sb->len + sb2->len);
 }
 
+const char *strbuf_join_argv(struct strbuf *buf,
+                            int argc, const char **argv, char delim)
+{
+       if (!argc)
+               return buf->buf;
+
+       strbuf_addstr(buf, *argv);
+       while (--argc) {
+               strbuf_addch(buf, delim);
+               strbuf_addstr(buf, *(++argv));
+       }
+
+       return buf->buf;
+}
+
 void strbuf_addchars(struct strbuf *sb, int c, size_t n)
 {
        strbuf_grow(sb, n);
diff --git a/strbuf.h b/strbuf.h
index fc40873b65..be02150df3 100644
--- a/strbuf.h
+++ b/strbuf.h
@@ -288,6 +288,13 @@ static inline void strbuf_addstr(struct strbuf *sb, const 
char *s)
  */
 void strbuf_addbuf(struct strbuf *sb, const struct strbuf *sb2);
 
+/**
+ * Join the arguments into a buffer. `delim` is put between every
+ * two arguments.
+ */
+const char *strbuf_join_argv(struct strbuf *buf, int argc,
+                            const char **argv, char delim);
+
 /**
  * This function can be used to expand a format string containing
  * placeholders. To that end, it parses the string and calls the specified
-- 
2.19.1.878.g0482332a22

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