X-Git-Url: https://vcs.fsf.org/?p=exim.git;a=blobdiff_plain;f=src%2Fsrc%2Fos.c;h=d40fb606d0e06c547649466db83d3e3a84977b70;hp=ee754f9f2689c44461aa56dad2f16cf72c05595f;hb=3ae121c94f0dfaeba5938de26931c49e29677d0a;hpb=8d6d5106a6f1bcba010877d55932a8d8dcfa88bd

diff --git a/src/src/os.c b/src/src/os.c
index ee754f9f2..d40fb606d 100644
--- a/src/src/os.c
+++ b/src/src/os.c
@@ -833,9 +833,57 @@ os_get_dns_resolver_res(void)
 
 #endif /* OS_GET_DNS_RESOLVER_RES */
 
+/* ----------------------------------------------------------------------- */
+
+/***********************************************************
+*                 unsetenv()                               *
+***********************************************************/
+
+/* Most modern systems define int unsetenv(const char*),
+* some don't. */
+
+#if !defined(OS_UNSETENV)
+int
+os_unsetenv(const char *name)
+{
+  return unsetenv(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
+
+/* ----------------------------------------------------------------------- */