Rename and refactor mch_FullName.

* Rename mch_FullName to mch_full_name to match the style guide.
* Add mch_full_dir_name, which saves the absolute path of a given
directory relative to cwd into a given buffer.
* Add function append_path, which glues together two given paths with a
slash.
* Adapt moonscript coding style to the tests.

src/buffer.c

@@ -2418,7 +2418,7 @@ void buflist_altfpos(win_T *win)
 
 /*
  * Return TRUE if 'ffname' is not the same file as current file.
- * Fname must have a full path (expanded by mch_FullName()).
+ * Fname must have a full path (expanded by mch_full_name()).
  */
 int otherfile(char_u *ffname)
 {

src/eval.c

@@ -12467,7 +12467,7 @@ static void f_resolve(typval_T *argvars, typval_T *rettv)
           q[-1] = NUL;
           q = gettail(p);
         }
-        if (q > p && !mch_isFullName(buf)) {
+        if (q > p && !mch_is_full_name(buf)) {
           /* symlink is relative to directory of argument */
           cpy = alloc((unsigned)(STRLEN(p) + STRLEN(buf) + 1));
           if (cpy != NULL) {

src/ex_getln.c

@@ -3944,7 +3944,7 @@ expand_shellcmd (
   flags |= EW_FILE | EW_EXEC;
 
   /* For an absolute name we don't use $PATH. */
-  if (mch_isFullName(pat))
+  if (mch_is_full_name(pat))
     path = (char_u *)" ";
   else if ((pat[0] == '.' && (vim_ispathsep(pat[1])
                               || (pat[1] == '.' && vim_ispathsep(pat[2])))))

src/fileio.c

@@ -4769,7 +4769,7 @@ void shorten_fnames(int force)
         && !path_with_url(buf->b_fname)
         && (force
             || buf->b_sfname == NULL
-            || mch_isFullName(buf->b_sfname))) {
+            || mch_is_full_name(buf->b_sfname))) {
       vim_free(buf->b_sfname);
       buf->b_sfname = NULL;
       p = shorten_fname(buf->b_ffname, dirname);

src/memline.c

@@ -3381,7 +3381,7 @@ int resolve_symlink(char_u *fname, char_u *buf)
      * portion of the filename (if any) and the path the symlink
      * points to.
      */
-    if (mch_isFullName(buf))
+    if (mch_is_full_name(buf))
       STRCPY(tmp, buf);
     else {
       char_u *tail;

src/misc1.c

@@ -7945,7 +7945,7 @@ static void expand_path_option(char_u *curdir, garray_T *gap)
     else if (path_with_url(buf))
       /* URL can't be used here */
       continue;
-    else if (!mch_isFullName(buf)) {
+    else if (!mch_is_full_name(buf)) {
       /* Expand relative path to their full path equivalent */
       len = (int)STRLEN(curdir);
       if (len + (int)STRLEN(buf) + 3 > MAXPATHL)
@@ -8086,7 +8086,7 @@ static void uniquefy_paths(garray_T *gap, char_u *pattern)
         break;
       }
 
-    if (mch_isFullName(path)) {
+    if (mch_is_full_name(path)) {
       /*
        * Last resort: shorten relative to curdir if possible.
        * 'possible' means:
@@ -8375,7 +8375,7 @@ gen_expand_wildcards (
        */
       if (mch_has_exp_wildcard(p)) {
         if ((flags & EW_PATH)
-            && !mch_isFullName(p)
+            && !mch_is_full_name(p)
             && !(p[0] == '.'
                  && (vim_ispathsep(p[1])
                      || (p[1] == '.' && vim_ispathsep(p[2]))))

src/os/fs.c

@@ -1,4 +1,4 @@
-/* vi:set ts=8 sts=4 sw=4:
+/* vi:set ts=2 sts=2 sw=2:
  *
  * VIM - Vi IMproved	by Bram Moolenaar
  *
@@ -33,96 +33,129 @@ int mch_chdir(char *path) {
 int mch_dirname(char_u *buf, int len)
 {
   int errno;
-  if ((errno = uv_cwd((char *)buf, len)) != 0) {
+  if ((errno = uv_cwd((char *) buf, len)) != 0) {
       STRCPY(buf, uv_strerror(errno));
       return FAIL;
   }
   return OK;
 }
 
+/* 
+ * Get the absolute name of the given relative directory.
+ *
+ * parameter directory: Directory name, relative to current directory.
+ * return FAIL for failure, OK for success
+ */
+int mch_full_dir_name(char *directory, char *buffer, int len)
+{
+  int retval = OK;
+
+  if(0 == STRLEN(directory)) {
+    return mch_dirname((char_u *) buffer, len);
+  }
+
+  char old_dir[MAXPATHL];
+
+  /* Get current directory name. */
+  if (FAIL == mch_dirname((char_u *) old_dir, MAXPATHL)) {
+    return FAIL;
+  }
+
+  /* We have to get back to the current dir at the end, check if that works. */
+  if (0 != mch_chdir(old_dir)) {
+    return FAIL;
+  }
+
+  if (0 != mch_chdir(directory)) {
+    retval = FAIL;
+  }
+
+  if ((FAIL == retval) || (FAIL == mch_dirname((char_u *) buffer, len))) {
+    retval = FAIL;
+  }
+   
+  if (0 != mch_chdir(old_dir)) {
+    /* That shouldn't happen, since we've tested if it works. */
+    retval = FAIL;
+    EMSG(_(e_prev_dir));
+  }
+  return retval;
+}
+
+/* 
+ * Append to_append to path with a slash in between.
+ */
+int append_path(char *path, char *to_append, int max_len)
+{
+  int current_length = STRLEN(path);
+  int to_append_length = STRLEN(to_append);
+
+  /* Do not append empty strings. */
+  if (0 == to_append_length)
+    return OK;
+
+  /* Do not append a dot. */
+  if (STRCMP(to_append, ".") == 0)
+    return OK;
+
+  /* Glue both paths with a slash. */
+  if (current_length > 0 && path[current_length-1] != '/') {
+    current_length += 1; /* Count the trailing slash. */
+
+    if (current_length > max_len)
+      return FAIL;
+
+    STRCAT(path, "/");
+  }
+
+  /* +1 for the NUL at the end. */
+  if (current_length + to_append_length +1 > max_len) {
+    return FAIL;
+  }
+
+  STRCAT(path, to_append);
+  return OK;
+}
+
 /*
  * Get absolute file name into "buf[len]".
  *
+ * parameter force: Also expand when the given path in fname is already
+ * absolute.
+ *
  * return FAIL for failure, OK for success
  */
-int mch_FullName(
-        char_u      *fname,
-        char_u      *buf,
-        int len,
-        int force                       /* also expand when already absolute path */
-        )
+int mch_full_name(char_u *fname, char_u *buf, int len, int force)
 {
-  int l;
-  char_u olddir[MAXPATHL];
-  char_u      *p;
-  int retval = OK;
-
+  char_u *p;
+  *buf = NUL;
 
+  char relative_directory[len];
+  char *end_of_path = (char *) fname;
 
   /* expand it if forced or not an absolute path */
-  if (force || !mch_isFullName(fname)) {
-    /*
-     * If the file name has a path, change to that directory for a moment,
-     * and then do the getwd() (and get back to where we were).
-     * This will get the correct path name with "../" things.
-     */
+  if (force || !mch_is_full_name(fname)) {
     if ((p = vim_strrchr(fname, '/')) != NULL) {
 
-      /* Only change directory when we are sure we can return to where
-       * we are now.  After doing "su" chdir(".") might not work. */
-      if ((mch_dirname(olddir, MAXPATHL) == FAIL
-         || mch_chdir((char *)olddir) != 0)) {
-        p = NULL;               /* can't get current dir: don't chdir */
-        retval = FAIL;
-      } else   {
-        /* The directory is copied into buf[], to be able to remove
-         * the file name without changing it (could be a string in
-         * read-only memory) */
-        if (p - fname >= len)
-          retval = FAIL;
-        else {
-          vim_strncpy(buf, fname, p - fname);
-          if (mch_chdir((char *)buf))
-            retval = FAIL;
-          else
-            fname = p + 1;
-          *buf = NUL;
-        }
-      }
-    }
-    if (mch_dirname(buf, len) == FAIL) {
-      retval = FAIL;
-      *buf = NUL;
-    }
-    if (p != NULL) {
-      l = mch_chdir((char *)olddir);
-      if (l != 0)
-        EMSG(_(e_prev_dir));
+      STRNCPY(relative_directory, fname, p-fname);
+      relative_directory[p-fname] = NUL;
+      end_of_path = (char *) (p + 1);
+    } else {
+      relative_directory[0] = NUL;
+      end_of_path = (char *) fname;
     }
 
-    l = STRLEN(buf);
-    if (l >= len - 1)
-      retval = FAIL;       /* no space for trailing "/" */
-    else if (l > 0 && buf[l - 1] != '/' && *fname != NUL
-             && STRCMP(fname, ".") != 0)
-      STRCAT(buf, "/");
+    if (FAIL == mch_full_dir_name(relative_directory, (char *) buf, len)) {
+      return FAIL;
+    }
   }
-
-  /* Catch file names which are too long. */
-  if (retval == FAIL || (int)(STRLEN(buf) + STRLEN(fname)) >= len)
-    return FAIL;
-
-  /* Do not append ".", "/dir/." is equal to "/dir". */
-  if (STRCMP(fname, ".") != 0)
-    STRCAT(buf, fname);
-
-  return OK;
+  return append_path((char *) buf, (char *) end_of_path, len);
 }
 
 /*
  * Return TRUE if "fname" does not depend on the current directory.
  */
-int mch_isFullName(char_u *fname)
+int mch_is_full_name(char_u *fname)
 {
   return *fname == '/' || *fname == '~';
 }

src/os/os.h

@@ -6,7 +6,7 @@
 long_u mch_total_mem(int special);
 int mch_chdir(char *path);
 int mch_dirname(char_u *buf, int len);
-int mch_FullName (char_u *fname, char_u *buf, int len, int force);
-int mch_isFullName (char_u *fname);
+int mch_full_name (char_u *fname, char_u *buf, int len, int force);
+int mch_is_full_name (char_u *fname);
 
 #endif

src/os_unix.c

@@ -1364,7 +1364,7 @@ int mch_can_exe(char_u *name)
   int retval;
 
   /* If it's an absolute or relative path don't need to use $PATH. */
-  if (mch_isFullName(name) || (name[0] == '.' && (name[1] == '/'
+  if (mch_is_full_name(name) || (name[0] == '.' && (name[1] == '/'
                                                   || (name[1] == '.' &&
                                                       name[2] == '/'))))
     return executable_file(name);

src/syntax.c

@@ -4187,7 +4187,7 @@ static void syn_cmd_include(exarg_T *eap, int syncing)
    */
   eap->argt |= (XFILE | NOSPC);
   separate_nextcmd(eap);
-  if (*eap->arg == '<' || *eap->arg == '$' || mch_isFullName(eap->arg)) {
+  if (*eap->arg == '<' || *eap->arg == '$' || mch_is_full_name(eap->arg)) {
     /* For an absolute path, "$VIM/..." or "<sfile>.." we ":source" the
      * file.  Need to expand the file name first.  In other cases
      * ":runtime!" is used. */

src/window.c

@@ -5065,7 +5065,7 @@ int path_with_url(char_u *fname)
  */
 int vim_isAbsName(char_u *name)
 {
-  return path_with_url(name) != 0 || mch_isFullName(name);
+  return path_with_url(name) != 0 || mch_is_full_name(name);
 }
 
 /*
@@ -5090,7 +5090,7 @@ vim_FullName (
 
   url = path_with_url(fname);
   if (!url)
-    retval = mch_FullName(fname, buf, len, force);
+    retval = mch_full_name(fname, buf, len, force);
   if (url || retval == FAIL) {
     /* something failed; use the file name (truncate when too long) */
     vim_strncpy(buf, fname, len - 1);