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-rw-r--r--lib/sh/makepath.c128
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diff --git a/lib/sh/makepath.c b/lib/sh/makepath.c
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+/* makepath.c - glue PATH and DIR together into a full pathname. */
+
+/* Copyright (C) 1987-2020 Free Software Foundation, Inc.
+
+ This file is part of GNU Bash, the Bourne Again SHell.
+
+ Bash is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ Bash is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with Bash. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <config.h>
+
+#if defined (HAVE_UNISTD_H)
+# ifdef _MINIX
+# include <sys/types.h>
+# endif
+# include <unistd.h>
+#endif
+
+#include <bashansi.h>
+#include "shell.h"
+
+#include <tilde/tilde.h>
+
+#ifndef NULL
+# define NULL 0
+#endif
+
+/* MAKE SURE THESE AGREE WITH ../../externs.h. */
+
+#ifndef MP_DOTILDE
+# define MP_DOTILDE 0x01
+# define MP_DOCWD 0x02
+# define MP_RMDOT 0x04
+# define MP_IGNDOT 0x08
+#endif
+
+extern char *get_working_directory PARAMS((char *));
+
+static char *nullpath = "";
+
+/* Take PATH, an element from, e.g., $CDPATH, and DIR, a directory name,
+ and paste them together into PATH/DIR. Tilde expansion is performed on
+ PATH if (flags & MP_DOTILDE) is non-zero. If PATH is NULL or the empty
+ string, it is converted to the current directory. A full pathname is
+ used if (flags & MP_DOCWD) is non-zero, otherwise `./' is used. If
+ (flags & MP_RMDOT) is non-zero, any `./' is removed from the beginning
+ of DIR. If (flags & MP_IGNDOT) is non-zero, a PATH that is "." or "./"
+ is ignored. */
+
+#define MAKEDOT() \
+ do { \
+ xpath = (char *)xmalloc (2); \
+ xpath[0] = '.'; \
+ xpath[1] = '\0'; \
+ pathlen = 1; \
+ } while (0)
+
+char *
+sh_makepath (path, dir, flags)
+ const char *path, *dir;
+ int flags;
+{
+ int dirlen, pathlen;
+ char *ret, *xpath, *xdir, *r, *s;
+
+ if (path == 0 || *path == '\0')
+ {
+ if (flags & MP_DOCWD)
+ {
+ xpath = get_working_directory ("sh_makepath");
+ if (xpath == 0)
+ {
+ ret = get_string_value ("PWD");
+ if (ret)
+ xpath = savestring (ret);
+ }
+ if (xpath == 0)
+ MAKEDOT();
+ else
+ pathlen = strlen (xpath);
+ }
+ else
+ MAKEDOT();
+ }
+ else if ((flags & MP_IGNDOT) && path[0] == '.' && (path[1] == '\0' ||
+ (path[1] == '/' && path[2] == '\0')))
+ {
+ xpath = nullpath;
+ pathlen = 0;
+ }
+ else
+ {
+ xpath = ((flags & MP_DOTILDE) && *path == '~') ? bash_tilde_expand (path, 0) : (char *)path;
+ pathlen = strlen (xpath);
+ }
+
+ xdir = (char *)dir;
+ dirlen = strlen (xdir);
+ if ((flags & MP_RMDOT) && dir[0] == '.' && dir[1] == '/')
+ {
+ xdir += 2;
+ dirlen -= 2;
+ }
+
+ r = ret = (char *)xmalloc (2 + dirlen + pathlen);
+ s = xpath;
+ while (*s)
+ *r++ = *s++;
+ if (s > xpath && s[-1] != '/')
+ *r++ = '/';
+ s = xdir;
+ while (*r++ = *s++)
+ ;
+ if (xpath != path && xpath != nullpath)
+ free (xpath);
+ return (ret);
+}