Moved mch_get_host_name and renamed it to os_get_hostanme

src/eval.c

@@ -10530,11 +10530,11 @@ static void f_hlexists(typval_T *argvars, typval_T *rettv)
  */
 static void f_hostname(typval_T *argvars, typval_T *rettv)
 {
-  char_u hostname[256];
+  char hostname[256];
 
-  mch_get_host_name(hostname, 256);
+  os_get_hostname(hostname, 256);
   rettv->v_type = VAR_STRING;
-  rettv->vval.v_string = vim_strsave(hostname);
+  rettv->vval.v_string = vim_strsave((char_u *)hostname);
 }
 
 /*

src/memline.c

@@ -345,7 +345,7 @@ int ml_open(buf_T *buf)
     set_b0_fname(b0p, buf);
     (void)os_get_user_name((char *)b0p->b0_uname, B0_UNAME_SIZE);
     b0p->b0_uname[B0_UNAME_SIZE - 1] = NUL;
-    mch_get_host_name(b0p->b0_hname, B0_HNAME_SIZE);
+    os_get_hostname((char *)b0p->b0_hname, B0_HNAME_SIZE);
     b0p->b0_hname[B0_HNAME_SIZE - 1] = NUL;
     long_to_char(os_get_pid(), b0p->b0_pid);
     if (*buf->b_p_key != NUL)

src/os/env.c

@@ -9,6 +9,10 @@
 #include <crt_externs.h>
 #endif
 
+#ifdef HAVE_SYS_UTSNAME_H
+#include <sys/utsname.h>
+#endif
+
 const char *os_getenv(const char *name)
 {
   return getenv(name);
@@ -60,3 +64,21 @@ long os_get_pid()
 #endif
 }
 
+void os_get_hostname(char *hostname, size_t len)
+{
+#ifdef HAVE_SYS_UTSNAME_H
+  struct utsname vutsname;
+
+  if (uname(&vutsname) < 0) {
+    *hostname = '\0';
+  } else {
+    strncpy(hostname, vutsname.nodename, len - 1);
+    hostname[len - 1] = '\0';
+  }
+#else
+  // TODO: Implement this for windows. See the implementation used in vim:
+  // https://code.google.com/p/vim/source/browse/src/os_win32.c?r=6b69d8dde19e32909f4ee3a6337e6a2ecfbb6f72#2899
+  *hostname = '\0';
+#endif
+}
+

src/os/os.h

@@ -87,6 +87,13 @@ char *os_getenvname_at_index(size_t index);
 ///
 /// @return the process ID.
 long os_get_pid(void);
+
+/// Get the hostname of the machine runing Neovim.
+///
+/// @param hostname Buffer to store the hostname.
+/// @param len Length of `hostname`.
+void os_get_hostname(char *hostname, size_t len);
+
 int os_get_usernames(garray_T *usernames);
 int os_get_user_name(char *s, size_t len);
 int os_get_uname(uid_t uid, char *s, size_t len);

src/os_unix.c

@@ -397,33 +397,6 @@ int vim_is_fastterm(char_u *name)
          || STRNICMP(name, "dtterm", 6) == 0;
 }
 
-/*
- * Insert host name is s[len].
- */
-
-#ifdef HAVE_SYS_UTSNAME_H
-void mch_get_host_name(char_u *s, int len)
-{
-  struct utsname vutsname;
-
-  if (uname(&vutsname) < 0)
-    *s = NUL;
-  else
-    vim_strncpy(s, (char_u *)vutsname.nodename, len - 1);
-}
-#else /* HAVE_SYS_UTSNAME_H */
-
-# ifdef HAVE_SYS_SYSTEMINFO_H
-#  define gethostname(nam, len) sysinfo(SI_HOSTNAME, nam, len)
-# endif
-
-void mch_get_host_name(char_u *s, int len)
-{
-  gethostname((char *)s, len);
-  s[len - 1] = NUL;     /* make sure it's terminated */
-}
-#endif /* HAVE_SYS_UTSNAME_H */
-
 #if defined(USE_FNAME_CASE) || defined(PROTO)
 /*
  * Set the case of the file name, if it already exists.  This will cause the

src/os_unix.h

@@ -19,7 +19,6 @@ int use_xterm_mouse(void);
 int vim_is_iris(char_u *name);
 int vim_is_vt300(char_u *name);
 int vim_is_fastterm(char_u *name);
-void mch_get_host_name(char_u *s, int len);
 void slash_adjust(char_u *p);
 void fname_case(char_u *name, int len);
 void mch_copy_sec(char_u *from_file, char_u *to_file);

src/os_unixx.h

@@ -58,10 +58,6 @@
 # include <sys/stream.h>
 #endif
 
-#ifdef HAVE_SYS_UTSNAME_H
-# include <sys/utsname.h>
-#endif
-
 #ifdef HAVE_SYS_SYSTEMINFO_H
 /*
  * foolish Sinix <sys/systeminfo.h> uses SYS_NMLN but doesn't include

test/unit/os/env.moon

@@ -9,6 +9,7 @@ const char *os_getenv(const char *name);
 int os_setenv(const char *name, const char *value, int override);
 char *os_getenvname_at_index(size_t index);
 long os_get_pid(void);
+void os_get_hostname(char *hostname, size_t len);
 ]]
 
 NULL = ffi.cast 'void*', 0
@@ -104,3 +105,13 @@ describe 'env function', ->
         -- /proc is not avaliable on all systems, test if pid is nonzero.
         eq true, (env.os_get_pid! > 0)
 
+  describe 'os_get_hostname', ->
+
+    it 'returns the hostname', ->
+      handle = io.popen 'hostname'
+      hostname = handle\read '*l'
+      handle\close!
+      hostname_buf = cstr 255, ''
+      env.os_get_hostname hostname_buf, 255
+      eq hostname,  (ffi.string hostname_buf)
+