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-rw-r--r--toys/patch.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/toys/patch.c b/toys/patch.c
index 62996538..cf22ecb5 100644
--- a/toys/patch.c
+++ b/toys/patch.c
@@ -196,6 +196,7 @@ done:
void patch_main(void)
{
+ int reverse = toys.optflags & FLAG_REVERSE;
if (TT.infile) TT.filepatch = xopen(TT.infile, O_RDONLY);
TT.filein = TT.fileout = -1;
@@ -255,12 +256,17 @@ void patch_main(void)
if (!strncmp(s, "\t1969-12-31", 10)) start = "/dev/null";
*s = 0;
+ if (reverse) {
+ s = start;
+ start = TT.oldname;
+ }
+
// If new file is /dev/null (before -p), we're deleting oldname
if (!strcmp(start, "/dev/null")) {
- start = TT.oldname;
+ start = reverse ? s : TT.oldname;
del++;
} else start = patchline+4;
-
+
// handle -p path truncation.
for (s = start; *s;) {
if ((toys.optflags & FLAG_PATHLEN) && TT.prefix == i) break;