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Index: head/usr.bin/patch/inp.c
===================================================================
--- head/usr.bin/patch/inp.c
+++ head/usr.bin/patch/inp.c
@@ -213,8 +213,11 @@
/* now scan the buffer and build pointer array */
iline = 1;
i_ptr[iline] = i_womp;
- /* test for NUL too, to maintain the behavior of the original code */
- for (s = i_womp, i = 0; i < i_size && *s != '\0'; s++, i++) {
+ /*
+ * Testing for NUL here actively breaks files that innocently use NUL
+ * for other reasons. mmap(2) succeeded, just scan the whole buffer.
+ */
+ for (s = i_womp, i = 0; i < i_size; s++, i++) {
if (*s == '\n') {
if (iline == lines_allocated) {
if (!reallocate_lines(&lines_allocated))

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