diff: emit /dev/null if diff -rN diffs a file against /dev/null
function old new delta
diffreg 1782 1786 +4
diff --git a/editors/diff.c b/editors/diff.c
index 0e96c84..7fce70d 100644
--- a/editors/diff.c
+++ b/editors/diff.c
@@ -858,7 +858,7 @@
* lines appended (beginning at b). If c is greater than d then there are
* lines missing from the to file.
*/
-static void change(char *file1, FILE *f1, char *file2, FILE *f2,
+static void change(const char *file1, FILE *f1, const char *file2, FILE *f2,
int a, int b, int c, int d)
{
if ((a > b && c > d) || (option_mask32 & FLAG_q)) {
@@ -902,7 +902,7 @@
}
-static void output(char *file1, FILE *f1, char *file2, FILE *f2)
+static void output(const char *file1, FILE *f1, const char *file2, FILE *f2)
{
/* Note that j0 and j1 can't be used as they are defined in math.h.
* This also allows the rather amusing variable 'j00'... */
@@ -999,7 +999,7 @@
*/
/* NB: files can be not REGular. The only sure thing that they
* are not both DIRectories. */
-static unsigned diffreg(char *file1, char *file2, int flags)
+static unsigned diffreg(const char *file1, const char *file2, int flags)
{
int *member; /* will be overlaid on nfile[1] */
int *class; /* will be overlaid on nfile[0] */
@@ -1022,13 +1022,11 @@
if (flags & D_EMPTY1)
/* can't be stdin, but xfopen_stdin() is smaller code */
- f1 = xfopen_stdin(bb_dev_null);
- else
- f1 = xfopen_stdin(file1);
+ file1 = bb_dev_null;
+ f1 = xfopen_stdin(file1);
if (flags & D_EMPTY2)
- f2 = xfopen_stdin(bb_dev_null);
- else
- f2 = xfopen_stdin(file2);
+ file2 = bb_dev_null;
+ f2 = xfopen_stdin(file2);
/* NB: if D_EMPTY1/2 is set, other file is always a regular file,
* not pipe/fifo/chardev/etc - D_EMPTY is used by "diff -r" only,