Add system-specific compatibility functions to make

up for various system deficiencies.

This makes sparse easier to port to silly things like
MinGW or Solaris. In particular:

 - strtold() is a C99 thing, not everybody has it
 - MinGW has problems with mmap(MAP_ANONYMOUS) and doesn't zero it.
 - st_ino/st_dev is POSIX identity testing, not supported by MinGW

1 files changed, 31 insertions, 0 deletions

diff --git a/compat.h b/compat.h
new file mode 100644
index 0000000..fecfcb1
--- /dev/null
+++ b/compat.h
@@ -0,0 +1,31 @@
+#ifndef COMPAT_H
+#define COMPAT_H
+
+/*
+ * Various systems get these things wrong. So
+ * we create a small compat library for them.
+ *
+ *  - zeroed anonymous mmap
+ *	Missing in mingw
+ *  - "string to long double" (C99 strtold())
+ *	Missing in Solaris and mingw
+ *  - checking for file identity (POSIX st_dev && st_ino comparison)
+ *	mingw needs to check the name (st_dev/st_ino are zero)
+ */
+struct stream;
+struct stat;
+
+/*
+ * Our "blob" allocator works on chunks that are multiples
+ * of this size (the underlying allocator may be a mmap that
+ * cannot handle smaller chunks, for example, so trying to
+ * allocate blobs that aren't aligned is not going to work).
+ */
+#define CHUNK 32768
+
+void *blob_alloc(unsigned long size);
+void blob_free(void *addr, unsigned long size);
+long double string_to_ld(const char *nptr, char **endptr);
+int identical_files(struct stream* s, struct stat *st, const char * name);
+
+#endif