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, 204 insertions, 0 deletions

diff --git a/src/path.c b/src/path.c
new file mode 100644
index 000000000..766f67427
--- /dev/null
+++ b/src/path.c
@@ -0,0 +1,204 @@
+#include "common.h"
+#include <stdarg.h>
+#include <stdio.h>
+#include <ctype.h>
+
+/*
+ * Based on the Android implementation, BSD licensed.
+ * Check http://android.git.kernel.org/
+ */
+int git_path_basename_r(char *buffer, size_t bufflen, const char *path)
+{
+	const char *endp, *startp;
+	int len, result;
+
+	/* Empty or NULL string gets treated as "." */
+	if (path == NULL || *path == '\0') {
+		startp  = ".";
+		len     = 1;
+		goto Exit;
+	}
+
+	/* Strip trailing slashes */
+	endp = path + strlen(path) - 1;
+	while (endp > path && *endp == '/')
+		endp--;
+
+	/* All slashes becomes "/" */
+	if (endp == path && *endp == '/') {
+		startp = "/";
+		len    = 1;
+		goto Exit;
+	}
+
+	/* Find the start of the base */
+	startp = endp;
+	while (startp > path && *(startp - 1) != '/')
+		startp--;
+
+	len = endp - startp +1;
+
+Exit:
+	result = len;
+	if (buffer == NULL) {
+		return result;
+	}
+	if (len > (int)bufflen-1) {
+		len    = (int)bufflen-1;
+		result = GIT_ENOMEM;
+	}
+
+	if (len >= 0) {
+		memmove(buffer, startp, len);
+		buffer[len] = 0;
+	}
+	return result;
+}
+
+/*
+ * Based on the Android implementation, BSD licensed.
+ * Check http://android.git.kernel.org/
+ */
+int git_path_dirname_r(char *buffer, size_t bufflen, const char *path)
+{
+    const char *endp;
+    int result, len;
+
+    /* Empty or NULL string gets treated as "." */
+    if (path == NULL || *path == '\0') {
+        path = ".";
+        len  = 1;
+        goto Exit;
+    }
+
+    /* Strip trailing slashes */
+    endp = path + strlen(path) - 1;
+    while (endp > path && *endp == '/')
+        endp--;
+
+    /* Find the start of the dir */
+    while (endp > path && *endp != '/')
+        endp--;
+
+    /* Either the dir is "/" or there are no slashes */
+    if (endp == path) {
+        path = (*endp == '/') ? "/" : ".";
+        len  = 1;
+        goto Exit;
+    }
+
+    do {
+        endp--;
+    } while (endp > path && *endp == '/');
+
+    len = endp - path +1;
+
+Exit:
+    result = len;
+    if (len+1 > GIT_PATH_MAX) {
+        return GIT_ENOMEM;
+    }
+    if (buffer == NULL)
+        return result;
+
+    if (len > (int)bufflen-1) {
+        len    = (int)bufflen-1;
+        result = GIT_ENOMEM;
+    }
+
+    if (len >= 0) {
+        memmove(buffer, path, len);
+        buffer[len] = 0;
+    }
+    return result;
+}
+
+
+char *git_path_dirname(const char *path)
+{
+    char *dname = NULL;
+    int len;
+
+	len = (path ? strlen(path) : 0) + 2;
+	dname = (char *)git__malloc(len);
+	if (dname == NULL)
+		return NULL;
+
+    if (git_path_dirname_r(dname, len, path) < GIT_SUCCESS) {
+		free(dname);
+		return NULL;
+	}
+
+    return dname;
+}
+
+char *git_path_basename(const char *path)
+{
+    char *bname = NULL;
+    int len;
+
+	len = (path ? strlen(path) : 0) + 2;
+	bname = (char *)git__malloc(len);
+	if (bname == NULL)
+		return NULL;
+
+    if (git_path_basename_r(bname, len, path) < GIT_SUCCESS) {
+		free(bname);
+		return NULL;
+	}
+
+    return bname;
+}
+
+
+const char *git_path_topdir(const char *path)
+{
+	size_t len;
+	int i;
+
+	assert(path);
+	len = strlen(path);
+
+	if (!len || path[len - 1] != '/')
+		return NULL;
+
+	for (i = len - 2; i >= 0; --i)
+		if (path[i] == '/')
+			break;
+
+	return &path[i + 1];
+}
+
+void git_path_join_n(char *buffer_out, int count, ...)
+{
+	va_list ap;
+	int i;
+	char *buffer_start = buffer_out;
+
+	va_start(ap, count);
+	for (i = 0; i < count; ++i) {
+		const char *path;
+		int len;
+
+		path = va_arg(ap, const char *);
+
+		assert((i == 0) || path != buffer_start);
+
+		if (i > 0 && *path == '/' && buffer_out > buffer_start && buffer_out[-1] == '/')
+			path++;
+
+		if (!*path)
+			continue;
+
+		len = strlen(path);
+		memmove(buffer_out, path, len);
+		buffer_out = buffer_out + len;
+
+		if (i < count - 1 && buffer_out[-1] != '/')
+			*buffer_out++ = '/';
+	}
+	va_end(ap);
+
+	*buffer_out = '\0';
+}
+