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git/diffcore-order.c

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[PATCH] Add -O<orderfile> option to diff-* brothers. A new diffcore filter diffcore-order is introduced. This takes a text file each of whose line is a shell glob pattern. Patches that match a glob pattern on an earlier line in the file are output before patches that match a later line, and patches that do not match any glob pattern are output last. A typical orderfile for git project probably should look like this: README Makefile Documentation *.h *.c Signed-off-by: Junio C Hamano <junkio@cox.net> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-30 09:09:07 +02:00
/*
* Copyright (C) 2005 Junio C Hamano
*/
#include "cache.h"
#include "diff.h"
#include "diffcore.h"
static char **order;
static int order_cnt;
static void prepare_order(const char *orderfile)
{
diff: let "git diff -O" read orderfile from any file and fail properly The -O flag really shouldn't silently fail to do anything when given a path that it can't read from. However, it should be able to read from un-mmappable files, such as: * pipes/fifos * /dev/null: It's a character device (at least on Linux) * ANY empty file: Quoting Linux mmap(2), "SUSv3 specifies that mmap() should fail if length is 0. However, in kernels before 2.6.12, mmap() succeeded in this case: no mapping was created and the call returned addr. Since kernel 2.6.12, mmap() fails with the error EINVAL for this case." We especially want "-O/dev/null" to work, since we will be documenting it as the way to cancel "diff.orderfile" when we add that. (Note: "-O/dev/null" did have the right effect, since the existing error handling essentially worked out to "silently ignore the orderfile". But this was probably more coincidence than anything else.) So, lets toss all of that logic to get the file mmapped and just use strbuf_read_file() instead, which gives us decent error handling practically for free. Signed-off-by: Samuel Bronson <naesten@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-12-19 01:08:11 +01:00
int cnt, pass;
struct strbuf sb = STRBUF_INIT;
[PATCH] Add -O<orderfile> option to diff-* brothers. A new diffcore filter diffcore-order is introduced. This takes a text file each of whose line is a shell glob pattern. Patches that match a glob pattern on an earlier line in the file are output before patches that match a later line, and patches that do not match any glob pattern are output last. A typical orderfile for git project probably should look like this: README Makefile Documentation *.h *.c Signed-off-by: Junio C Hamano <junkio@cox.net> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-30 09:09:07 +02:00
void *map;
char *cp, *endp;
diff: let "git diff -O" read orderfile from any file and fail properly The -O flag really shouldn't silently fail to do anything when given a path that it can't read from. However, it should be able to read from un-mmappable files, such as: * pipes/fifos * /dev/null: It's a character device (at least on Linux) * ANY empty file: Quoting Linux mmap(2), "SUSv3 specifies that mmap() should fail if length is 0. However, in kernels before 2.6.12, mmap() succeeded in this case: no mapping was created and the call returned addr. Since kernel 2.6.12, mmap() fails with the error EINVAL for this case." We especially want "-O/dev/null" to work, since we will be documenting it as the way to cancel "diff.orderfile" when we add that. (Note: "-O/dev/null" did have the right effect, since the existing error handling essentially worked out to "silently ignore the orderfile". But this was probably more coincidence than anything else.) So, lets toss all of that logic to get the file mmapped and just use strbuf_read_file() instead, which gives us decent error handling practically for free. Signed-off-by: Samuel Bronson <naesten@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-12-19 01:08:11 +01:00
ssize_t sz;
[PATCH] Add -O<orderfile> option to diff-* brothers. A new diffcore filter diffcore-order is introduced. This takes a text file each of whose line is a shell glob pattern. Patches that match a glob pattern on an earlier line in the file are output before patches that match a later line, and patches that do not match any glob pattern are output last. A typical orderfile for git project probably should look like this: README Makefile Documentation *.h *.c Signed-off-by: Junio C Hamano <junkio@cox.net> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-30 09:09:07 +02:00
if (order)
return;
diff: let "git diff -O" read orderfile from any file and fail properly The -O flag really shouldn't silently fail to do anything when given a path that it can't read from. However, it should be able to read from un-mmappable files, such as: * pipes/fifos * /dev/null: It's a character device (at least on Linux) * ANY empty file: Quoting Linux mmap(2), "SUSv3 specifies that mmap() should fail if length is 0. However, in kernels before 2.6.12, mmap() succeeded in this case: no mapping was created and the call returned addr. Since kernel 2.6.12, mmap() fails with the error EINVAL for this case." We especially want "-O/dev/null" to work, since we will be documenting it as the way to cancel "diff.orderfile" when we add that. (Note: "-O/dev/null" did have the right effect, since the existing error handling essentially worked out to "silently ignore the orderfile". But this was probably more coincidence than anything else.) So, lets toss all of that logic to get the file mmapped and just use strbuf_read_file() instead, which gives us decent error handling practically for free. Signed-off-by: Samuel Bronson <naesten@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-12-19 01:08:11 +01:00
sz = strbuf_read_file(&sb, orderfile, 0);
if (sz < 0)
die_errno(_("failed to read orderfile '%s'"), orderfile);
map = strbuf_detach(&sb, NULL);
Cast 64 bit off_t to 32 bit size_t Some systems have sizeof(off_t) == 8 while sizeof(size_t) == 4. This implies that we are able to access and work on files whose maximum length is around 2^63-1 bytes, but we can only malloc or mmap somewhat less than 2^32-1 bytes of memory. On such a system an implicit conversion of off_t to size_t can cause the size_t to wrap, resulting in unexpected and exciting behavior. Right now we are working around all gcc warnings generated by the -Wshorten-64-to-32 option by passing the off_t through xsize_t(). In the future we should make xsize_t on such problematic platforms detect the wrapping and die if such a file is accessed. Signed-off-by: Shawn O. Pearce <spearce@spearce.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2007-03-07 02:44:37 +01:00
endp = (char *) map + sz;
diff: let "git diff -O" read orderfile from any file and fail properly The -O flag really shouldn't silently fail to do anything when given a path that it can't read from. However, it should be able to read from un-mmappable files, such as: * pipes/fifos * /dev/null: It's a character device (at least on Linux) * ANY empty file: Quoting Linux mmap(2), "SUSv3 specifies that mmap() should fail if length is 0. However, in kernels before 2.6.12, mmap() succeeded in this case: no mapping was created and the call returned addr. Since kernel 2.6.12, mmap() fails with the error EINVAL for this case." We especially want "-O/dev/null" to work, since we will be documenting it as the way to cancel "diff.orderfile" when we add that. (Note: "-O/dev/null" did have the right effect, since the existing error handling essentially worked out to "silently ignore the orderfile". But this was probably more coincidence than anything else.) So, lets toss all of that logic to get the file mmapped and just use strbuf_read_file() instead, which gives us decent error handling practically for free. Signed-off-by: Samuel Bronson <naesten@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-12-19 01:08:11 +01:00
[PATCH] Add -O<orderfile> option to diff-* brothers. A new diffcore filter diffcore-order is introduced. This takes a text file each of whose line is a shell glob pattern. Patches that match a glob pattern on an earlier line in the file are output before patches that match a later line, and patches that do not match any glob pattern are output last. A typical orderfile for git project probably should look like this: README Makefile Documentation *.h *.c Signed-off-by: Junio C Hamano <junkio@cox.net> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-30 09:09:07 +02:00
for (pass = 0; pass < 2; pass++) {
cnt = 0;
cp = map;
while (cp < endp) {
char *ep;
for (ep = cp; ep < endp && *ep != '\n'; ep++)
;
/* cp to ep has one line */
if (*cp == '\n' || *cp == '#')
; /* comment */
else if (pass == 0)
cnt++;
else {
if (*ep == '\n') {
*ep = 0;
order[cnt] = cp;
Use xmemdupz() in many places. Signed-off-by: Pierre Habouzit <madcoder@debian.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-09-16 00:32:36 +02:00
} else {
order[cnt] = xmemdupz(cp, ep - cp);
[PATCH] Add -O<orderfile> option to diff-* brothers. A new diffcore filter diffcore-order is introduced. This takes a text file each of whose line is a shell glob pattern. Patches that match a glob pattern on an earlier line in the file are output before patches that match a later line, and patches that do not match any glob pattern are output last. A typical orderfile for git project probably should look like this: README Makefile Documentation *.h *.c Signed-off-by: Junio C Hamano <junkio@cox.net> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-30 09:09:07 +02:00
}
cnt++;
}
if (ep < endp)
ep++;
cp = ep;
}
if (pass == 0) {
order_cnt = cnt;
order = xmalloc(sizeof(*order) * cnt);
}
}
}
struct pair_order {
struct diff_filepair *pair;
int orig_order;
int order;
};
static int match_order(const char *path)
{
int i;
Prevent buffer overflows when path is too long Some buffers created with PATH_MAX length are not checked when being written, and can overflow if PATH_MAX is not big enough to hold the path. Replace those buffers by strbufs so that their size is automatically grown if necessary. They are created as static local variables to avoid reallocating memory on each call. Note that prefix_filename() returns this static buffer so each callers should copy or use the string immediately (this is currently true). Reported-by: Wataru Noguchi <wnoguchi.0727@gmail.com> Signed-off-by: Antoine Pelisse <apelisse@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-12-14 12:31:16 +01:00
static struct strbuf p = STRBUF_INIT;
[PATCH] Add -O<orderfile> option to diff-* brothers. A new diffcore filter diffcore-order is introduced. This takes a text file each of whose line is a shell glob pattern. Patches that match a glob pattern on an earlier line in the file are output before patches that match a later line, and patches that do not match any glob pattern are output last. A typical orderfile for git project probably should look like this: README Makefile Documentation *.h *.c Signed-off-by: Junio C Hamano <junkio@cox.net> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-30 09:09:07 +02:00
for (i = 0; i < order_cnt; i++) {
Prevent buffer overflows when path is too long Some buffers created with PATH_MAX length are not checked when being written, and can overflow if PATH_MAX is not big enough to hold the path. Replace those buffers by strbufs so that their size is automatically grown if necessary. They are created as static local variables to avoid reallocating memory on each call. Note that prefix_filename() returns this static buffer so each callers should copy or use the string immediately (this is currently true). Reported-by: Wataru Noguchi <wnoguchi.0727@gmail.com> Signed-off-by: Antoine Pelisse <apelisse@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-12-14 12:31:16 +01:00
strbuf_reset(&p);
strbuf_addstr(&p, path);
while (p.buf[0]) {
[PATCH] Add -O<orderfile> option to diff-* brothers. A new diffcore filter diffcore-order is introduced. This takes a text file each of whose line is a shell glob pattern. Patches that match a glob pattern on an earlier line in the file are output before patches that match a later line, and patches that do not match any glob pattern are output last. A typical orderfile for git project probably should look like this: README Makefile Documentation *.h *.c Signed-off-by: Junio C Hamano <junkio@cox.net> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-30 09:09:07 +02:00
char *cp;
Prevent buffer overflows when path is too long Some buffers created with PATH_MAX length are not checked when being written, and can overflow if PATH_MAX is not big enough to hold the path. Replace those buffers by strbufs so that their size is automatically grown if necessary. They are created as static local variables to avoid reallocating memory on each call. Note that prefix_filename() returns this static buffer so each callers should copy or use the string immediately (this is currently true). Reported-by: Wataru Noguchi <wnoguchi.0727@gmail.com> Signed-off-by: Antoine Pelisse <apelisse@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-12-14 12:31:16 +01:00
if (!fnmatch(order[i], p.buf, 0))
[PATCH] Add -O<orderfile> option to diff-* brothers. A new diffcore filter diffcore-order is introduced. This takes a text file each of whose line is a shell glob pattern. Patches that match a glob pattern on an earlier line in the file are output before patches that match a later line, and patches that do not match any glob pattern are output last. A typical orderfile for git project probably should look like this: README Makefile Documentation *.h *.c Signed-off-by: Junio C Hamano <junkio@cox.net> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-30 09:09:07 +02:00
return i;
Prevent buffer overflows when path is too long Some buffers created with PATH_MAX length are not checked when being written, and can overflow if PATH_MAX is not big enough to hold the path. Replace those buffers by strbufs so that their size is automatically grown if necessary. They are created as static local variables to avoid reallocating memory on each call. Note that prefix_filename() returns this static buffer so each callers should copy or use the string immediately (this is currently true). Reported-by: Wataru Noguchi <wnoguchi.0727@gmail.com> Signed-off-by: Antoine Pelisse <apelisse@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-12-14 12:31:16 +01:00
cp = strrchr(p.buf, '/');
[PATCH] Add -O<orderfile> option to diff-* brothers. A new diffcore filter diffcore-order is introduced. This takes a text file each of whose line is a shell glob pattern. Patches that match a glob pattern on an earlier line in the file are output before patches that match a later line, and patches that do not match any glob pattern are output last. A typical orderfile for git project probably should look like this: README Makefile Documentation *.h *.c Signed-off-by: Junio C Hamano <junkio@cox.net> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-30 09:09:07 +02:00
if (!cp)
break;
*cp = 0;
}
}
return order_cnt;
}
static int compare_pair_order(const void *a_, const void *b_)
{
struct pair_order const *a, *b;
a = (struct pair_order const *)a_;
b = (struct pair_order const *)b_;
if (a->order != b->order)
return a->order - b->order;
return a->orig_order - b->orig_order;
}
void diffcore_order(const char *orderfile)
{
struct diff_queue_struct *q = &diff_queued_diff;
avoid asking ?alloc() for zero bytes. Avoid asking for zero bytes when that change simplifies overall logic. Later we would change the wrapper to ask for 1 byte on platforms that return NULL for zero byte request. Signed-off-by: Junio C Hamano <junkio@cox.net>
2005-12-26 21:34:56 +01:00
struct pair_order *o;
[PATCH] Add -O<orderfile> option to diff-* brothers. A new diffcore filter diffcore-order is introduced. This takes a text file each of whose line is a shell glob pattern. Patches that match a glob pattern on an earlier line in the file are output before patches that match a later line, and patches that do not match any glob pattern are output last. A typical orderfile for git project probably should look like this: README Makefile Documentation *.h *.c Signed-off-by: Junio C Hamano <junkio@cox.net> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-30 09:09:07 +02:00
int i;
avoid asking ?alloc() for zero bytes. Avoid asking for zero bytes when that change simplifies overall logic. Later we would change the wrapper to ask for 1 byte on platforms that return NULL for zero byte request. Signed-off-by: Junio C Hamano <junkio@cox.net>
2005-12-26 21:34:56 +01:00
if (!q->nr)
return;
o = xmalloc(sizeof(*o) * q->nr);
[PATCH] Add -O<orderfile> option to diff-* brothers. A new diffcore filter diffcore-order is introduced. This takes a text file each of whose line is a shell glob pattern. Patches that match a glob pattern on an earlier line in the file are output before patches that match a later line, and patches that do not match any glob pattern are output last. A typical orderfile for git project probably should look like this: README Makefile Documentation *.h *.c Signed-off-by: Junio C Hamano <junkio@cox.net> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-30 09:09:07 +02:00
prepare_order(orderfile);
for (i = 0; i < q->nr; i++) {
o[i].pair = q->queue[i];
o[i].orig_order = i;
o[i].order = match_order(o[i].pair->two->path);
}
qsort(o, q->nr, sizeof(*o), compare_pair_order);
for (i = 0; i < q->nr; i++)
q->queue[i] = o[i].pair;
free(o);
return;
}
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