From 3ae121c94f0dfaeba5938de26931c49e29677d0a Mon Sep 17 00:00:00 2001
From: "Heiko Schlittermann (HS12-RIPE)" <hs@schlittermann.de>
Date: Wed, 23 Mar 2016 22:53:27 +0100
Subject: [PATCH] Provide getcwd(NULL, 0) for Solaris (SunOS5)

---
 .editorconfig         |  2 +-
 src/OS/os.h-SunOS5    |  6 ++++++
 src/src/exim.c        |  2 +-
 src/src/os.c          | 32 ++++++++++++++++++++++++++++++++
 src/src/osfunctions.h |  3 +++
 5 files changed, 43 insertions(+), 2 deletions(-)

diff --git a/.editorconfig b/.editorconfig
index b348a15d8..a781a03ae 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -17,7 +17,7 @@ root = true
 end_of_line = lf
 insert_final_newline = true
 
-[*.{c,h}]
+[*.{c,h}{,-*}]
 indent_style = space
 indent_size = 2
 tab_width = 8
diff --git a/src/OS/os.h-SunOS5 b/src/OS/os.h-SunOS5
index 45a1171c8..807212b85 100644
--- a/src/OS/os.h-SunOS5
+++ b/src/OS/os.h-SunOS5
@@ -37,4 +37,10 @@ it seems. */
 #endif
 
 
+/* SunOS5 doesn't accept getcwd(NULL, 0) to auto-allocate
+a buffer */
+
+#define OS_GETCWD
+
+
 /* End */
diff --git a/src/src/exim.c b/src/src/exim.c
index 9cafc9a73..6a4fb5af3 100644
--- a/src/src/exim.c
+++ b/src/src/exim.c
@@ -3748,7 +3748,7 @@ directory to "/"! Later we change to $spool_directory. We do it there, because
 during readconf_main() some expansion takes place already. */
 
 /* Store the initial cwd before we change directories */
-if ((initial_cwd = getcwd(NULL, 0)) == NULL)
+if ((initial_cwd = os_getcwd(NULL, 0)) == NULL)
   {
   perror("exim: can't get the current working directory");
   exit(EXIT_FAILURE);
diff --git a/src/src/os.c b/src/src/os.c
index d9ca589ee..d40fb606d 100644
--- a/src/src/os.c
+++ b/src/src/os.c
@@ -850,6 +850,38 @@ os_unsetenv(const char *name)
 }
 #endif
 
+/* ----------------------------------------------------------------------- */
+
+/***********************************************************
+*               getcwd()                                   *
+***********************************************************/
+
+/* Glibc allows getcwd(NULL, 0) to do auto-allocation. Some systems
+do auto-allocation, but need the size of the buffer, and others
+may not even do this. If the OS supports getcwd(NULL, 0) we'll use
+this, for all other systems we provide our own getcwd() */
+
+#if !defined(OS_GETCWD)
+char *
+os_getcwd(char *buffer, size_t size)
+{
+return getcwd(buffer, size);
+}
+#else
+#ifndef PATH_MAX
+# define PATH_MAX 4096
+#endif
+char *
+os_getcwd(char *buffer, size_t size)
+{
+void *rc;
+
+if (!size) size = PATH_MAX;
+if (!buffer && !(buffer = (char*) malloc(size))) return NULL;
+if (!(buffer = getcwd(buffer, size))) return NULL;
+return realloc(buffer, strlen(buffer) + 1);
+}
+#endif
 
 /* ----------------------------------------------------------------------- */
 
diff --git a/src/src/osfunctions.h b/src/src/osfunctions.h
index 3d1914acb..0e429fc8c 100644
--- a/src/src/osfunctions.h
+++ b/src/src/osfunctions.h
@@ -35,5 +35,8 @@ extern const char   *os_strsignal(int);   /* char to match strsignal in some OS
 #ifndef os_unsetenv
 extern int           os_unsetenv(const char *);
 #endif
+#ifndef os_getcwd
+extern char*         os_getcwd(char *, size_t);
+#endif
 
 /* End of osfunctions.h */
-- 
2.25.1