fileops: Cleanup

Cleaned up the structure of the whole OS-abstraction layer.

fileops.c now contains a set of utility methods for file management used
by the library. These are abstractions on top of the original POSIX
calls.

There's a new file called `posix.c` that contains
emulations/reimplementations of all the POSIX calls the library uses.
These are prefixed with `p_`. There's a specific posix file for each
platform (win32 and unix).

All the path-related methods have been moved from `utils.c` to `path.c`
and have their own prefix.

1 files changed, 74 insertions, 0 deletions

diff --git a/src/posix.c b/src/posix.c
new file mode 100644
index 000000000..9dbebbd57
--- /dev/null
+++ b/src/posix.c
@@ -0,0 +1,74 @@
+#include "common.h"
+#include "posix.h"
+#include "path.h"
+#include <stdio.h>
+#include <ctype.h>
+
+int p_open(const char *path, int flags)
+{
+	return open(path, flags | O_BINARY);
+}
+
+int p_creat(const char *path, int mode)
+{
+	return open(path, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, mode);
+}
+
+int p_read(git_file fd, void *buf, size_t cnt)
+{
+	char *b = buf;
+	while (cnt) {
+		ssize_t r = read(fd, b, cnt);
+		if (r < 0) {
+			if (errno == EINTR || errno == EAGAIN)
+				continue;
+			return GIT_EOSERR;
+		}
+		if (!r)
+			break;
+		cnt -= r;
+		b += r;
+	}
+	return (int)(b - (char *)buf);
+}
+
+int p_write(git_file fd, void *buf, size_t cnt)
+{
+	char *b = buf;
+	while (cnt) {
+		ssize_t r = write(fd, b, cnt);
+		if (r < 0) {
+			if (errno == EINTR || errno == EAGAIN)
+				continue;
+			return GIT_EOSERR;
+		}
+		if (!r) {
+			errno = EPIPE;
+			return GIT_EOSERR;
+		}
+		cnt -= r;
+		b += r;
+	}
+	return GIT_SUCCESS;
+}
+
+int p_getcwd(char *buffer_out, size_t size)
+{
+	char *cwd_buffer;
+
+	assert(buffer_out && size > 0);
+
+#ifdef GIT_WIN32
+	cwd_buffer = _getcwd(buffer_out, size);
+#else
+	cwd_buffer = getcwd(buffer_out, size);
+#endif
+
+	if (cwd_buffer == NULL)
+		return git__throw(GIT_EOSERR, "Failed to retrieve current working directory");
+
+	git_path_mkposix(buffer_out);
+
+	git_path_join(buffer_out, buffer_out, "");	//Ensure the path ends with a trailing slash
+	return GIT_SUCCESS;
+}