3 files changed, 66 insertions, 42 deletions

diff --git a/src/os/shell.c b/src/os/shell.c
index cbedf72a9c..2f3f2f6095 100644
--- a/src/os/shell.c
+++ b/src/os/shell.c
@@ -1,9 +1,12 @@
+#include <string.h>
 #include <stdbool.h>
 
 #include "os/shell.h"
 #include "types.h"
 #include "vim.h"
 #include "ascii.h"
+#include "misc2.h"
+#include "option_defs.h"
 #include "charset.h"
 
 
@@ -54,4 +57,60 @@ int shell_count_argc(char_u **ptr)
   return rv;
 }
 
-char ** shell_build_argv(char_u **ptr, int argc);
+char ** shell_build_argv(int argc, char_u *cmd,
+    char_u *extra_shell_arg, char_u **ptr, char_u **p_shcf_copy_ptr)
+{
+  char **argv;
+  char_u *p_shcf_copy = *p_shcf_copy_ptr;
+  char_u *p = *ptr;
+  // Allocate argv memory
+  argv = (char **)alloc((unsigned)((argc + 4) * sizeof(char *)));
+  if (argv == NULL) // out of memory
+    return NULL;
+  
+  // Build argv[]
+  argc = 0;
+  while (true) {
+    argv[argc] = (char *)p;
+    ++argc;
+    shell_skip_word(&p);
+    if (*p == NUL)
+      break;
+    // Terminate the word
+    *p++ = NUL;
+    p = skipwhite(p);
+  }
+  if (cmd != NULL) {
+    char_u  *s;
+
+    if (extra_shell_arg != NULL)
+      argv[argc++] = (char *)extra_shell_arg;
+
+    // Break 'shellcmdflag' into white separated parts.  This doesn't
+    // handle quoted strings, they are very unlikely to appear.
+    p_shcf_copy = alloc((unsigned)STRLEN(p_shcf) + 1);
+    if (p_shcf_copy == NULL) {
+      // out of memory 
+      free(argv);
+      return NULL;
+    }
+
+    s = p_shcf_copy;
+    p = p_shcf;
+    while (*p != NUL) {
+      argv[argc++] = (char *)s;
+      while (*p && *p != ' ' && *p != TAB)
+        *s++ = *p++;
+      *s++ = NUL;
+      p = skipwhite(p);
+    }
+
+    argv[argc++] = (char *)cmd;
+  }
+
+  argv[argc] = NULL;
+  *ptr = p;
+  *p_shcf_copy_ptr = p_shcf_copy;
+
+  return argv;
+}
diff --git a/src/os/shell.h b/src/os/shell.h
index 754f27df37..981171e787 100644
--- a/src/os/shell.h
+++ b/src/os/shell.h
@@ -7,6 +7,8 @@
 
 void shell_skip_word(char_u **ptr);
 int shell_count_argc(char_u **ptr);
+char ** shell_build_argv(int argc, char_u *cmd,
+    char_u *extra_shell_arg, char_u **ptr, char_u **p_shcf_copy_ptr);
 
 #endif  // NEOVIM_OS_SHELL_H
 
diff --git a/src/os_unix.c b/src/os_unix.c
index d53ddac830..eb960cef00 100644
--- a/src/os_unix.c
+++ b/src/os_unix.c
@@ -1721,51 +1721,14 @@ int mch_call_shell(char_u *cmd, int options, char_u *extra_shell_arg)
   // Count the number of arguments for the shell
   p = newcmd;
   argc = shell_count_argc(&p);
-
-  // Allocate argv memory
-  argv = (char **)alloc((unsigned)((argc + 4) * sizeof(char *)));
-  if (argv == NULL) // out of memory
-    goto error;
-  
-  // Build argv[]
   p = newcmd;
-  argc = 0;
-  while (true) {
-    argv[argc] = (char *)p;
-    ++argc;
-    shell_skip_word(&p);
-    if (*p == NUL)
-      break;
-    // Terminate the word
-    *p++ = NUL;
-    p = skipwhite(p);
-  }
-  if (cmd != NULL) {
-    char_u  *s;
-
-    if (extra_shell_arg != NULL)
-      argv[argc++] = (char *)extra_shell_arg;
-
-    /* Break 'shellcmdflag' into white separated parts.  This doesn't
-     * handle quoted strings, they are very unlikely to appear. */
-    p_shcf_copy = alloc((unsigned)STRLEN(p_shcf) + 1);
-    if (p_shcf_copy == NULL)        /* out of memory */
-      goto error;
-    s = p_shcf_copy;
-    p = p_shcf;
-    while (*p != NUL) {
-      argv[argc++] = (char *)s;
-      while (*p && *p != ' ' && *p != TAB)
-        *s++ = *p++;
-      *s++ = NUL;
-      p = skipwhite(p);
-    }
+  argv = shell_build_argv(argc, cmd, extra_shell_arg, &p, &p_shcf_copy);
 
-    argv[argc++] = (char *)cmd;
+  if (argv == NULL) {
+    goto error;
   }
-  argv[argc] = NULL;
 
-  /*
+ /*
    * For the GUI, when writing the output into the buffer and when reading
    * input from the buffer: Try using a pseudo-tty to get the stdin/stdout
    * of the executed command into the Vim window.  Or use a pipe.