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authorRob Landley <rob@landley.net>2019-12-21 04:27:06 -0600
committerRob Landley <rob@landley.net>2019-12-21 04:27:06 -0600
commit058471577a73a693c681ce9059809c2e444a4bd7 (patch)
treef933cdc0cf5800a49cd889751175d54d9372cfeb /toys/posix
parente4b41a30e4fd7da9b61837f0fc91705b53a81c06 (diff)
downloadtoybox-058471577a73a693c681ce9059809c2e444a4bd7.tar.gz
Add patch -F (fuzz factor)
Diffstat (limited to 'toys/posix')
-rw-r--r--toys/posix/patch.c37
1 files changed, 29 insertions, 8 deletions
diff --git a/toys/posix/patch.c b/toys/posix/patch.c
index 440a90b9..3a708a71 100644
--- a/toys/posix/patch.c
+++ b/toys/posix/patch.c
@@ -14,15 +14,14 @@
* -r rejectfile write rejected hunks to this file
*
* -E remove empty files --remove-empty-files
- * -F fuzz (number, default 2)
-USE_PATCH(NEWTOY(patch, ">2(no-backup-if-mismatch)(dry-run)"USE_TOYBOX_DEBUG("x")"g#fulp#d:i:Rs(quiet)", TOYFLAG_USR|TOYFLAG_BIN))
+USE_PATCH(NEWTOY(patch, ">2(no-backup-if-mismatch)(dry-run)"USE_TOYBOX_DEBUG("x")"F#g#fulp#d:i:Rs(quiet)", TOYFLAG_USR|TOYFLAG_BIN))
config PATCH
bool "patch"
default y
help
- usage: patch [-d DIR] [-i PATCH] [-p depth] [-Rlsu] [--dry-run] [FILE [PATCH]]
+ usage: patch [-d DIR] [-i PATCH] [-p depth] [-F FUZZ] [-Rlsu] [--dry-run] [FILE [PATCH]]
Apply a unified diff to one or more files.
@@ -36,7 +35,7 @@ config PATCH
--dry-run Don't change files, just confirm patch applies
This version of patch only handles unified diffs, and only modifies
- a file when all hunks to that file apply. Patch prints failed hunks
+ a file when all hunks to that file apply. Patch prints failed hunks
to stderr, and exits with nonzero status if any hunks fail.
A file compared against /dev/null (or with a date <= the epoch) is
@@ -48,7 +47,7 @@ config PATCH
GLOBALS(
char *i, *d;
- long p, g;
+ long p, g, F;
struct double_list *current_hunk;
long oldline, oldlen, newline, newlen;
@@ -130,7 +129,7 @@ static int loosecmp(char *aa, char *bb)
static int apply_one_hunk(void)
{
struct double_list *plist, *buf = NULL, *check;
- int matcheof, trailing = 0, reverse = FLAG(R), backwarn = 0;
+ int matcheof, trailing = 0, reverse = FLAG(R), backwarn = 0, allfuzz=0, fuzz;
int (*lcmp)(char *aa, char *bb);
lcmp = FLAG(l) ? (void *)loosecmp : (void *)strcmp;
@@ -138,11 +137,25 @@ static int apply_one_hunk(void)
// Match EOF if there aren't as many ending context lines as beginning
for (plist = TT.current_hunk; plist; plist = plist->next) {
- if (plist->data[0]==' ') trailing++;
+ char c = *plist->data, *s;
+
+ if (c==' ') trailing++;
else trailing = 0;
+
+ // Only allow fuzz if 2 context lines have multiple nonwhitespace chars.
+ // avoids the "all context was blank or } lines" issue. Removed lines
+ // count as context since they're matched.
+ if (c==' ' || c=="-+"[reverse]) {
+ s = plist->data+1;
+ while (isspace(*s)) s++;
+ if (*s && s[1] && !isspace(s[1])) allfuzz++;
+ }
+
if (FLAG(x)) fprintf(stderr, "HUNK:%s\n", plist->data);
}
matcheof = !trailing || trailing < TT.context;
+ if (allfuzz<2) allfuzz = 0;
+ else allfuzz = FLAG(F) ? TT.F : TT.context ? TT.context-1 : 0;
if (FLAG(x)) fprintf(stderr,"MATCHEOF=%c\n", matcheof ? 'Y' : 'N');
@@ -150,6 +163,7 @@ static int apply_one_hunk(void)
// lines and all lines to be removed until we've found the end of a
// complete hunk.
plist = TT.current_hunk;
+ fuzz = allfuzz;
buf = NULL;
for (;;) {
@@ -184,7 +198,7 @@ static int apply_one_hunk(void)
// Compare this line with next expected line of hunk.
// A match can fail because the next line doesn't match, or because
- // we hit the end of a hunk that needed EOF, and this isn't EOF.
+ // we hit the end of a hunk that needed EOF and this isn't EOF.
// If match failed, flush first line of buffered data and
// recheck buffered data for a new match until we find one or run
@@ -192,6 +206,11 @@ static int apply_one_hunk(void)
for (;;) {
if (!plist || lcmp(check->data, plist->data+1)) {
+ if (plist && *plist->data == ' ' && fuzz-->0) {
+ if (FLAG(x)) fprintf(stderr, "FUZZED: %s\n", plist->data);
+ goto fuzzed;
+ }
+
// Match failed. Write out first line of buffered data and
// recheck remaining buffered data for a new match.
@@ -215,6 +234,7 @@ static int apply_one_hunk(void)
TT.state = 3;
do_line(check = dlist_pop(&buf));
plist = TT.current_hunk;
+ fuzz = allfuzz;
// If we've reached the end of the buffer without confirming a
// match, read more lines.
@@ -222,6 +242,7 @@ static int apply_one_hunk(void)
check = buf;
} else {
if (FLAG(x)) fprintf(stderr, "MAYBE: %s\n", plist->data);
+fuzzed:
// This line matches. Advance plist, detect successful match.
plist = plist->next;
if (!plist && !matcheof) goto out;