util: added file_compare() utility function

file_compare() returns true if two files are the same. It is meant for
small files.

Pair-Programmed-With: Andrew Bartlett <abartlet@samba.org>

2 files changed, 27 insertions, 0 deletions

diff --git a/lib/util/util.h b/lib/util/util.h
index 729190af63..da9776163a 100644
--- a/lib/util/util.h
+++ b/lib/util/util.h
@@ -601,6 +601,11 @@ _PUBLIC_ int vfdprintf(int fd, const char *format, va_list ap) PRINTF_ATTRIBUTE(
 _PUBLIC_ int fdprintf(int fd, const char *format, ...) PRINTF_ATTRIBUTE(2,3);
 _PUBLIC_ bool large_file_support(const char *path);
 
+/*
+  compare two files, return true if the two files have the same content
+ */
+bool file_compare(const char *path1, const char *path2);
+
 /* The following definitions come from lib/util/util.c  */
 
 
diff --git a/lib/util/util_file.c b/lib/util/util_file.c
index 7466004e5c..aa0b2d5855 100644
--- a/lib/util/util_file.c
+++ b/lib/util/util_file.c
@@ -435,3 +435,25 @@ _PUBLIC_ bool large_file_support(const char *path)
 }
 
 
+/*
+  compare two files, return true if the two files have the same content
+ */
+bool file_compare(const char *path1, const char *path2)
+{
+	size_t size1, size2;
+	char *p1, *p2;
+	TALLOC_CTX *mem_ctx = talloc_new(NULL);
+
+	p1 = file_load(path1, &size1, 0, mem_ctx);
+	p2 = file_load(path2, &size2, 0, mem_ctx);
+	if (!p1 || !p2 || size1 != size2) {
+		talloc_free(mem_ctx);
+		return false;
+	}
+	if (memcmp(p1, p2, size1) != 0) {
+		talloc_free(mem_ctx);
+		return false;
+	}
+	talloc_free(mem_ctx);
+	return true;
+}