move read_mmfile() into xdiff-interface

read_file() was a useful function if you want to work with the xdiff stuff,
so it was renamed and put into a more central place.

Signed-off-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
Signed-off-by: Junio C Hamano <junkio@cox.net>

builtin-merge-file.c

@@ -1,26 +1,10 @@
 #include "cache.h"
 #include "xdiff/xdiff.h"
+#include "xdiff-interface.h"
 
 static const char merge_file_usage[] =
 "git merge-file [-p | --stdout] [-q | --quiet] [-L name1 [-L orig [-L name2]]] file1 orig_file file2";
 
-static int read_file(mmfile_t *ptr, const char *filename)
-{
-	struct stat st;
-	FILE *f;
-
-	if (stat(filename, &st))
-		return error("Could not stat %s", filename);
-	if ((f = fopen(filename, "rb")) == NULL)
-		return error("Could not open %s", filename);
-	ptr->ptr = xmalloc(st.st_size);
-	if (fread(ptr->ptr, st.st_size, 1, f) != 1)
-		return error("Could not read %s", filename);
-	fclose(f);
-	ptr->size = st.st_size;
-	return 0;
-}
-
 int cmd_merge_file(int argc, char **argv, char **envp)
 {
 	char *names[3];
@@ -53,7 +37,7 @@ int cmd_merge_file(int argc, char **argv, char **envp)
 		names[i] = argv[i + 1];
 
 	for (i = 0; i < 3; i++)
-		if (read_file(mmfs + i, argv[i + 1]))
+		if (read_mmfile(mmfs + i, argv[i + 1]))
 			return -1;
 
 	ret = xdl_merge(mmfs + 1, mmfs + 0, names[0], mmfs + 2, names[2],

xdiff-interface.c

@@ -102,3 +102,22 @@ int xdiff_outf(void *priv_, mmbuffer_t *mb, int nbuf)
 	}
 	return 0;
 }
+
+int read_mmfile(mmfile_t *ptr, const char *filename)
+{
+	struct stat st;
+	FILE *f;
+
+	if (stat(filename, &st))
+		return error("Could not stat %s", filename);
+	if ((f = fopen(filename, "rb")) == NULL)
+		return error("Could not open %s", filename);
+	ptr->ptr = xmalloc(st.st_size);
+	if (fread(ptr->ptr, st.st_size, 1, f) != 1)
+		return error("Could not read %s", filename);
+	fclose(f);
+	ptr->size = st.st_size;
+	return 0;
+}
+
+

xdiff-interface.h

@@ -17,5 +17,6 @@ int xdiff_outf(void *priv_, mmbuffer_t *mb, int nbuf);
 int parse_hunk_header(char *line, int len,
 		      int *ob, int *on,
 		      int *nb, int *nn);
+int read_mmfile(mmfile_t *ptr, const char *filename);
 
 #endif