* -D define wrap #ifdef and #ifndef around changes
* -o outfile output here instead of in place
* -r rejectfile write rejected hunks to this file
+ * --dry-run (regression!)
*
* -f force (no questions asked)
* -F fuzz (number, default 2)
* [file] which file to patch
*/
-//applet:IF_PATCH(APPLET(patch, _BB_DIR_USR_BIN, _BB_SUID_DROP))
-
-//kbuild:lib-$(CONFIG_PATCH) += patch.o
-
//config:config PATCH
//config: bool "patch"
//config: default y
//config: help
//config: Apply a unified diff formatted patch.
+//applet:IF_PATCH(APPLET(patch, BB_DIR_USR_BIN, BB_SUID_DROP))
+
+//kbuild:lib-$(CONFIG_PATCH) += patch.o
+
//usage:#define patch_trivial_usage
//usage: "[OPTIONS] [ORIGFILE [PATCHFILE]]"
//usage:#define patch_full_usage "\n\n"
//usage: "\n -i,--input DIFF Read DIFF instead of stdin"
//usage: "\n -R,--reverse Reverse patch"
//usage: "\n -N,--forward Ignore already applied patches"
-//usage: "\n --dry-run Don't actually change files"
+/*usage: "\n --dry-run Don't actually change files" - TODO */
//usage: "\n -E,--remove-empty-files Remove output files if they become empty"
//usage: )
//usage: IF_NOT_LONG_OPTS(
//usage: "\n -N Ignore already applied patches"
//usage: "\n -E Remove output files if they become empty"
//usage: )
+/* -u "interpret as unified diff" is supported but not documented: this info is not useful for --help */
+/* -x "debug" is supported but does nothing */
//usage:
//usage:#define patch_example_usage
//usage: "$ patch -p1 < example.diff\n"
#include "libbb.h"
+
+// libbb candidate?
+
struct double_list {
struct double_list *next;
struct double_list *prev;
char *data;
};
-// Return the first item from the list, advancing the list (which must be called
-// as &list)
-static
-void *TOY_llist_pop(void *list)
-{
- // I'd use a void ** for the argument, and even accept the typecast in all
- // callers as documentation you need the &, except the stupid compiler
- // would then scream about type-punned pointers. Screw it.
- void **llist = (void **)list;
- void **next = (void **)*llist;
- *llist = *next;
-
- return (void *)next;
-}
-
// Free all the elements of a linked list
-// if freeit!=NULL call freeit() on each element before freeing it.
-static
-void TOY_llist_free(void *list, void (*freeit)(void *data))
+// Call freeit() on each element before freeing it.
+static void dlist_free(struct double_list *list, void (*freeit)(void *data))
{
while (list) {
- void *pop = TOY_llist_pop(&list);
- if (freeit) freeit(pop);
- else free(pop);
-
- // End doubly linked list too.
- if (list==pop) break;
+ void *pop = list;
+ list = list->next;
+ freeit(pop);
+ // Bail out also if list is circular.
+ if (list == pop) break;
}
}
-//Override bbox's names
-#define llist_pop TOY_llist_pop
-#define llist_free TOY_llist_free
-// Add an entry to the end off a doubly linked list
-static
-struct double_list *dlist_add(struct double_list **list, char *data)
+// Add an entry before "list" element in (circular) doubly linked list
+static struct double_list *dlist_add(struct double_list **list, char *data)
{
- struct double_list *line = xmalloc(sizeof(struct double_list));
+ struct double_list *llist;
+ struct double_list *line = xmalloc(sizeof(*line));
line->data = data;
- if (*list) {
- line->next = *list;
- line->prev = (*list)->prev;
- (*list)->prev->next = line;
- (*list)->prev = line;
- } else *list = line->next = line->prev = line;
+ llist = *list;
+ if (llist) {
+ struct double_list *p;
+ line->next = llist;
+ p = line->prev = llist->prev;
+ // (list is circular, we assume p is never NULL)
+ p->next = line;
+ llist->prev = line;
+ } else
+ *list = line->next = line->prev = line;
return line;
}
-
struct globals {
char *infile;
long prefix;
struct double_list *current_hunk;
+
long oldline, oldlen, newline, newlen;
long linenum;
- int context, state, filein, fileout, hunknum;
+ int context, state, hunknum;
+ int filein, fileout;
char *tempname;
- // was toys.foo:
int exitval;
};
#define TT (*ptr_to_globals)
#define FLAG_INPUT (1 << 3)
#define FLAG_IGNORE (1 << 4)
#define FLAG_RMEMPTY (1 << 5)
-//non-standard:
-#define FLAG_DEBUG (1 << 6)
+/* Enable this bit and use -x for debug output: */
+#define FLAG_DEBUG (0 << 6)
// Dispose of a line of input, either by writing it out or discarding it.
static void fail_hunk(void)
{
if (!TT.current_hunk) return;
- TT.current_hunk->prev->next = NULL;
fdprintf(2, "Hunk %d FAILED %ld/%ld.\n", TT.hunknum, TT.oldline, TT.newline);
TT.exitval = 1;
// this file and advance to next file.
TT.state = 2;
- llist_free(TT.current_hunk, do_line);
+ TT.current_hunk->prev->next = NULL;
+ dlist_free(TT.current_hunk, do_line);
TT.current_hunk = NULL;
// Abort the copy and delete the temporary file.
else matcheof = 0;
if (PATCH_DEBUG) fdprintf(2, "HUNK:%s\n", plist->data);
}
- matcheof = matcheof < TT.context;
+ matcheof = !matcheof || matcheof < TT.context;
if (PATCH_DEBUG) fdprintf(2,"MATCHEOF=%c\n", matcheof ? 'Y' : 'N');
// complete hunk.
plist = TT.current_hunk;
buf = NULL;
- if (TT.context) for (;;) {
- char *data = xmalloc_reads(TT.filein, NULL, NULL);
+ if (reverse ? TT.oldlen : TT.newlen) for (;;) {
+ char *data = xmalloc_reads(TT.filein, NULL);
TT.linenum++;
fdprintf(2, "NOT: %s\n", plist->data);
TT.state = 3;
- check = llist_pop(&buf);
+ check = buf;
+ buf = buf->next;
check->prev->next = buf;
buf->prev = check->prev;
do_line(check);
out:
// We have a match. Emit changed data.
TT.state = "-+"[reverse ^ dummy_revert];
- llist_free(TT.current_hunk, do_line);
+ dlist_free(TT.current_hunk, do_line);
TT.current_hunk = NULL;
TT.state = 1;
done:
if (buf) {
buf->prev->next = NULL;
- llist_free(buf, do_line);
+ dlist_free(buf, do_line);
}
return TT.state;
int reverse, state = 0;
char *oldname = NULL, *newname = NULL;
char *opt_p, *opt_i;
+ long oldlen = oldlen; /* for compiler */
+ long newlen = newlen; /* for compiler */
INIT_TT();
if (*patchline==' ' || *patchline=='+' || *patchline=='-') {
dlist_add(&TT.current_hunk, patchline);
- if (*patchline != '+') TT.oldlen--;
- if (*patchline != '-') TT.newlen--;
+ if (*patchline != '+') oldlen--;
+ if (*patchline != '-') newlen--;
// Context line?
if (*patchline==' ' && state==2) TT.context++;
// If we've consumed all expected hunk lines, apply the hunk.
- if (!TT.oldlen && !TT.newlen) state = apply_one_hunk();
+ if (!oldlen && !newlen) state = apply_one_hunk();
continue;
}
fail_hunk();
// Read oldline[,oldlen] +newline[,newlen]
- TT.oldlen = TT.newlen = 1;
+ TT.oldlen = oldlen = TT.newlen = newlen = 1;
TT.oldline = strtol(s, &s, 10);
- if (*s == ',') TT.oldlen=strtol(s+1, &s, 10);
+ if (*s == ',') TT.oldlen = oldlen = strtol(s+1, &s, 10);
TT.newline = strtol(s+2, &s, 10);
- if (*s == ',') TT.newlen = strtol(s+1, &s, 10);
+ if (*s == ',') TT.newlen = newlen = strtol(s+1, &s, 10);
+
+ if (oldlen < 1 && newlen < 1)
+ bb_error_msg_and_die("Really? %s", patchline);
TT.context = 0;
state = 2;
int oldsum, newsum, empty = 0;
char *name;
- oldsum = TT.oldline + TT.oldlen;
- newsum = TT.newline + TT.newlen;
+ oldsum = TT.oldline + oldlen;
+ newsum = TT.newline + newlen;
name = reverse ? oldname : newname;
// We're deleting oldname if new file is /dev/null (before -p)
// or if new hunk is empty (zero context) after patching
- if (!strcmp(name, "/dev/null") || !(reverse ? oldsum : newsum))
- {
+ if (!strcmp(name, "/dev/null") || !(reverse ? oldsum : newsum)) {
name = reverse ? newname : oldname;
empty++;
}
// handle -p path truncation.
- for (i=0, s = name; *s;) {
- if ((option_mask32 & FLAG_PATHLEN) && TT.prefix == i) break;
- if (*(s++)=='/') {
- name = s;
- i++;
- }
+ for (i = 0, s = name; *s;) {
+ if ((option_mask32 & FLAG_PATHLEN) && TT.prefix == i)
+ break;
+ if (*s++ != '/')
+ continue;
+ while (*s == '/')
+ s++;
+ i++;
+ name = s;
}
if (empty) {
projects / oweals / busybox.git / blobdiff