From 247983e9820fd264cb5a59c14cc12846c028bd08 Mon Sep 17 00:00:00 2001
From: Andreas Schneider <asn@cryptomilk.org>
Date: Wed, 29 Aug 2018 18:41:15 +0200
Subject: misc: Add strndup implementation if not provides by the OS

Signed-off-by: Andreas Schneider <asn@cryptomilk.org>
---
 ConfigureChecks.cmake |  1 +
 config.h.cmake        |  3 +++
 include/libssh/priv.h |  4 ++++
 src/misc.c            | 21 +++++++++++++++++++++
 4 files changed, 29 insertions(+)

diff --git a/ConfigureChecks.cmake b/ConfigureChecks.cmake
index 57cd0811..f91bd038 100644
--- a/ConfigureChecks.cmake
+++ b/ConfigureChecks.cmake
@@ -150,6 +150,7 @@ endif (NOT WITH_MBEDTLS)
 
 check_function_exists(isblank HAVE_ISBLANK)
 check_function_exists(strncpy HAVE_STRNCPY)
+check_function_exists(strndup HAVE_STRNDUP)
 check_function_exists(strtoull HAVE_STRTOULL)
 check_function_exists(explicit_bzero HAVE_EXPLICIT_BZERO)
 check_function_exists(memset_s HAVE_MEMSET_S)
diff --git a/config.h.cmake b/config.h.cmake
index 8c469b6c..96dd4a87 100644
--- a/config.h.cmake
+++ b/config.h.cmake
@@ -130,6 +130,9 @@
 /* Define to 1 if you have the `strncpy' function. */
 #cmakedefine HAVE_STRNCPY 1
 
+/* Define to 1 if you have the `strndup' function. */
+#cmakedefine HAVE_STRNDUP 1
+
 /* Define to 1 if you have the `cfmakeraw' function. */
 #cmakedefine HAVE_CFMAKERAW 1
 
diff --git a/include/libssh/priv.h b/include/libssh/priv.h
index 0aab4edb..2123fc03 100644
--- a/include/libssh/priv.h
+++ b/include/libssh/priv.h
@@ -44,6 +44,10 @@
 # endif
 #endif /* !defined(HAVE_STRTOULL) */
 
+#if !defined(HAVE_STRNDUP)
+char *strndup(const char *s, size_t n);
+#endif /* ! HAVE_STRNDUP */
+
 #ifdef HAVE_BYTESWAP_H
 #include <byteswap.h>
 #endif
diff --git a/src/misc.c b/src/misc.c
index 5f606044..89934900 100644
--- a/src/misc.c
+++ b/src/misc.c
@@ -1085,4 +1085,25 @@ void explicit_bzero(void *s, size_t n)
 }
 #endif /* !HAVE_EXPLICIT_BZERO */
 
+#if !defined(HAVE_STRNDUP)
+char *strndup(const char *s, size_t n)
+{
+    char *x = NULL;
+
+    if (n + 1 < n) {
+        return NULL;
+    }
+
+    x = malloc(n + 1);
+    if (x == NULL) {
+        return NULL;
+    }
+
+    memcpy(x, s, n);
+    x[n] = '\0';
+
+    return x;
+}
+#endif /* ! HAVE_STRNDUP */
+
 /** @} */
-- 
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