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, 53 insertions, 0 deletions

diff --git a/compat-linux.c b/compat-linux.c
new file mode 100644
index 0000000..afa278b
--- /dev/null
+++ b/compat-linux.c
@@ -0,0 +1,53 @@
+/*
+ * Sane compat.c for Linux
+ */
+#define _GNU_SOURCE
+
+#include <stdlib.h>
+#include <sys/mman.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#include "lib.h"
+#include "token.h"
+
+/*
+ * Allow old BSD naming too, it would be a pity to have to make a
+ * separate file just for this.
+ */
+#ifndef MAP_ANONYMOUS
+#define MAP_ANONYMOUS MAP_ANON
+#endif
+
+/*
+ * Our blob allocator enforces the strict CHUNK size
+ * requirement, as a portability check.
+ */
+void *blob_alloc(unsigned long size)
+{
+	void *ptr;
+
+	if (size & ~CHUNK)
+		die("internal error: bad allocation size (%d bytes)", size);
+	ptr = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+	if (ptr == MAP_FAILED)
+		ptr = NULL;
+	return ptr;
+}
+
+void blob_free(void *addr, unsigned long size)
+{
+	if (!size || (size & ~CHUNK) || ((unsigned long) addr & 512))
+		die("internal error: bad blob free (%d bytes at %p)", size, addr);
+	munmap(addr, size);
+}
+
+long double string_to_ld(const char *nptr, char **endptr)
+{
+	return strtold(nptr, endptr);
+}
+
+int identical_files(struct stream* s, struct stat *st, const char * name)
+{
+	return s->dev == st->st_dev && s->ino == st->st_ino;
+}