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patch: tweaks

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1) Eliminate spurious warnings about possibly reduced hunks.  Instead only
note a possible location if we don't find a non-reversed place to apply it.
(Otherwise, hunks that move code forward around within a file look reversed at
the removal site.)

2) Open the source file read-only, so we can apply patches to read-only files.

Signed-off-by: Rob Landley <rob@landley.net>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Rob Landley 2010-10-04 00:49:48 +02:00 committed by Denys Vlasenko
parent e2069fb325
commit 9d113cac42
1 changed files with 6 additions and 4 deletions
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10
editors/patch.c
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@ -344,14 +344,12 @@ static int apply_one_hunk(void)
while (plist && *plist->data == "+-"[reverse]) {
if (data && !strcmp(data, plist->data+1)) {
if (!backwarn) {
backwarn++;
backwarn = TT.linenum;
if (option_mask32 & FLAG_IGNORE) {
dummy_revert = 1;
reverse ^= 1;
continue;
}
fdprintf(2,"Possibly reversed hunk %d at %ld\n",
TT.hunknum, TT.linenum);
}
}
plist = plist->next;
@ -364,6 +362,10 @@ static int apply_one_hunk(void)
// Does this hunk need to match EOF?
if (!plist && matcheof) break;
if (backwarn)
fdprintf(2,"Possibly reversed hunk %d at %ld\n",
TT.hunknum, TT.linenum);
// File ended before we found a place for this hunk.
fail_hunk();
goto done;
@ -592,7 +594,7 @@ int patch_main(int argc UNUSED_PARAM, char **argv)
TT.filein = xopen3(name, O_CREAT|O_EXCL|O_RDWR, 0666);
} else {
printf("patching file %s\n", name);
TT.filein = xopen(name, O_RDWR);
TT.filein = xopen(name, O_RDONLY);
}
TT.fileout = copy_tempfile(TT.filein, name, &TT.tempname);
TT.linenum = 0;