mirror of
https://github.com/sheumann/hush.git
synced 2024-08-17 00:29:03 +00:00
560 lines
13 KiB
C
560 lines
13 KiB
C
|
/* Adapted from toybox's patch. Currently unused */
|
||
|
|
||
|
/* vi: set sw=4 ts=4:
|
||
|
*
|
||
|
* patch.c - Apply a "universal" diff.
|
||
|
*
|
||
|
* Copyright 2007 Rob Landley <rob@landley.net>
|
||
|
*
|
||
|
* see http://www.opengroup.org/onlinepubs/009695399/utilities/patch.html
|
||
|
* (But only does -u, because who still cares about "ed"?)
|
||
|
*
|
||
|
* TODO:
|
||
|
* -b backup
|
||
|
* -l treat all whitespace as a single space
|
||
|
* -N ignore already applied
|
||
|
* -d chdir first
|
||
|
* -D define wrap #ifdef and #ifndef around changes
|
||
|
* -o outfile output here instead of in place
|
||
|
* -r rejectfile write rejected hunks to this file
|
||
|
*
|
||
|
* -E remove empty files --remove-empty-files
|
||
|
* -f force (no questions asked)
|
||
|
* -F fuzz (number, default 2)
|
||
|
* [file] which file to patch
|
||
|
|
||
|
USE_PATCH(NEWTOY(patch, "up#i:R", TOYFLAG_USR|TOYFLAG_BIN))
|
||
|
|
||
|
config PATCH
|
||
|
bool "patch"
|
||
|
default y
|
||
|
help
|
||
|
usage: patch [-i file] [-p depth] [-Ru]
|
||
|
|
||
|
Apply a unified diff to one or more files.
|
||
|
|
||
|
-i Input file (defaults=stdin)
|
||
|
-p number of '/' to strip from start of file paths (default=all)
|
||
|
-R Reverse patch.
|
||
|
-u Ignored (only handles "unified" diffs)
|
||
|
|
||
|
This version of patch only handles unified diffs, and only modifies
|
||
|
a file when all 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
|
||
|
created/deleted as appropriate.
|
||
|
*/
|
||
|
#include "libbb.h"
|
||
|
|
||
|
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))
|
||
|
{
|
||
|
while (list) {
|
||
|
void *pop = TOY_llist_pop(&list);
|
||
|
if (freeit) freeit(pop);
|
||
|
else free(pop);
|
||
|
|
||
|
// End doubly linked list too.
|
||
|
if (list==pop) break;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// Add an entry to the end off a doubly linked list
|
||
|
static
|
||
|
struct double_list *dlist_add(struct double_list **list, char *data)
|
||
|
{
|
||
|
struct double_list *line = xmalloc(sizeof(struct double_list));
|
||
|
|
||
|
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;
|
||
|
|
||
|
return line;
|
||
|
}
|
||
|
|
||
|
// Ensure entire path exists.
|
||
|
// If mode != -1 set permissions on newly created dirs.
|
||
|
// Requires that path string be writable (for temporary null terminators).
|
||
|
static
|
||
|
void xmkpath(char *path, int mode)
|
||
|
{
|
||
|
char *p, old;
|
||
|
mode_t mask;
|
||
|
int rc;
|
||
|
struct stat st;
|
||
|
|
||
|
for (p = path; ; p++) {
|
||
|
if (!*p || *p == '/') {
|
||
|
old = *p;
|
||
|
*p = rc = 0;
|
||
|
if (stat(path, &st) || !S_ISDIR(st.st_mode)) {
|
||
|
if (mode != -1) {
|
||
|
mask = umask(0);
|
||
|
rc = mkdir(path, mode);
|
||
|
umask(mask);
|
||
|
} else rc = mkdir(path, 0777);
|
||
|
}
|
||
|
*p = old;
|
||
|
if(rc) bb_perror_msg_and_die("mkpath '%s'", path);
|
||
|
}
|
||
|
if (!*p) break;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// Slow, but small.
|
||
|
static
|
||
|
char *get_rawline(int fd, long *plen, char end)
|
||
|
{
|
||
|
char c, *buf = NULL;
|
||
|
long len = 0;
|
||
|
|
||
|
for (;;) {
|
||
|
if (1>read(fd, &c, 1)) break;
|
||
|
if (!(len & 63)) buf=xrealloc(buf, len+65);
|
||
|
if ((buf[len++]=c) == end) break;
|
||
|
}
|
||
|
if (buf) buf[len]=0;
|
||
|
if (plen) *plen = len;
|
||
|
|
||
|
return buf;
|
||
|
}
|
||
|
|
||
|
static
|
||
|
char *get_line(int fd)
|
||
|
{
|
||
|
long len;
|
||
|
char *buf = get_rawline(fd, &len, '\n');
|
||
|
|
||
|
if (buf && buf[--len]=='\n') buf[len]=0;
|
||
|
|
||
|
return buf;
|
||
|
}
|
||
|
|
||
|
// Copy the rest of in to out and close both files.
|
||
|
static
|
||
|
void xsendfile(int in, int out)
|
||
|
{
|
||
|
long len;
|
||
|
char buf[4096];
|
||
|
|
||
|
if (in<0) return;
|
||
|
for (;;) {
|
||
|
len = safe_read(in, buf, 4096);
|
||
|
if (len<1) break;
|
||
|
xwrite(out, buf, len);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// Copy the rest of the data and replace the original with the copy.
|
||
|
static
|
||
|
void replace_tempfile(int fdin, int fdout, char **tempname)
|
||
|
{
|
||
|
char *temp = xstrdup(*tempname);
|
||
|
|
||
|
temp[strlen(temp)-6]=0;
|
||
|
if (fdin != -1) {
|
||
|
xsendfile(fdin, fdout);
|
||
|
xclose(fdin);
|
||
|
}
|
||
|
xclose(fdout);
|
||
|
rename(*tempname, temp);
|
||
|
free(*tempname);
|
||
|
free(temp);
|
||
|
*tempname = NULL;
|
||
|
}
|
||
|
|
||
|
// Open a temporary file to copy an existing file into.
|
||
|
static
|
||
|
int copy_tempfile(int fdin, char *name, char **tempname)
|
||
|
{
|
||
|
struct stat statbuf;
|
||
|
int fd;
|
||
|
|
||
|
*tempname = xasprintf("%sXXXXXX", name);
|
||
|
fd = mkstemp(*tempname);
|
||
|
if(-1 == fd) bb_perror_msg_and_die("no temp file");
|
||
|
|
||
|
// Set permissions of output file
|
||
|
fstat(fdin, &statbuf);
|
||
|
fchmod(fd, statbuf.st_mode);
|
||
|
|
||
|
return fd;
|
||
|
}
|
||
|
|
||
|
// Abort the copy and delete the temporary file.
|
||
|
static
|
||
|
void delete_tempfile(int fdin, int fdout, char **tempname)
|
||
|
{
|
||
|
close(fdin);
|
||
|
close(fdout);
|
||
|
unlink(*tempname);
|
||
|
free(*tempname);
|
||
|
*tempname = NULL;
|
||
|
}
|
||
|
|
||
|
|
||
|
|
||
|
struct globals {
|
||
|
struct double_list *plines;
|
||
|
long linenum;
|
||
|
int context;
|
||
|
int hunknum;
|
||
|
int filein;
|
||
|
int fileout;
|
||
|
int state;
|
||
|
char *tempname;
|
||
|
smallint exitval;
|
||
|
};
|
||
|
#define TT (*ptr_to_globals)
|
||
|
#define INIT_TT() do { \
|
||
|
SET_PTR_TO_GLOBALS(xzalloc(sizeof(TT))); \
|
||
|
} while (0)
|
||
|
|
||
|
|
||
|
//bbox had: "p:i:RN"
|
||
|
#define FLAG_STR "Rup:i:"
|
||
|
/* FLAG_REVERSE must be == 1! Code uses this fact. */
|
||
|
#define FLAG_REVERSE (1 << 0)
|
||
|
#define FLAG_u (1 << 1)
|
||
|
#define FLAG_PATHLEN (1 << 2)
|
||
|
#define FLAG_INPUT (1 << 3)
|
||
|
|
||
|
// Dispose of a line of input, either by writing it out or discarding it.
|
||
|
|
||
|
// state < 2: just free
|
||
|
// state = 2: write whole line to stderr
|
||
|
// state = 3: write whole line to fileout
|
||
|
// state > 3: write line+1 to fileout when *line != state
|
||
|
|
||
|
static void do_line(void *data)
|
||
|
{
|
||
|
struct double_list *dlist = (struct double_list *)data;
|
||
|
|
||
|
if (TT.state>1 && *dlist->data != TT.state)
|
||
|
fdprintf(TT.state == 2 ? 2 : TT.fileout,
|
||
|
"%s\n", dlist->data+(TT.state>3 ? 1 : 0));
|
||
|
|
||
|
free(dlist->data);
|
||
|
free(data);
|
||
|
}
|
||
|
|
||
|
static void finish_oldfile(void)
|
||
|
{
|
||
|
if (TT.tempname) replace_tempfile(TT.filein, TT.fileout, &TT.tempname);
|
||
|
TT.fileout = TT.filein = -1;
|
||
|
}
|
||
|
|
||
|
static void fail_hunk(void)
|
||
|
{
|
||
|
if (!TT.plines) return;
|
||
|
TT.plines->prev->next = 0;
|
||
|
|
||
|
fdprintf(2, "Hunk %d FAILED.\n", TT.hunknum);
|
||
|
TT.exitval = 1;
|
||
|
|
||
|
// If we got to this point, we've seeked to the end. Discard changes to
|
||
|
// this file and advance to next file.
|
||
|
|
||
|
TT.state = 2;
|
||
|
TOY_llist_free(TT.plines, do_line);
|
||
|
TT.plines = NULL;
|
||
|
delete_tempfile(TT.filein, TT.fileout, &TT.tempname);
|
||
|
TT.state = 0;
|
||
|
}
|
||
|
|
||
|
static int apply_hunk(void)
|
||
|
{
|
||
|
struct double_list *plist, *buf = NULL, *check;
|
||
|
int i = 0, backwards = 0, matcheof = 0,
|
||
|
reverse = option_mask32 & FLAG_REVERSE;
|
||
|
|
||
|
// Break doubly linked list so we can use singly linked traversal function.
|
||
|
TT.plines->prev->next = NULL;
|
||
|
|
||
|
// Match EOF if there aren't as many ending context lines as beginning
|
||
|
for (plist = TT.plines; plist; plist = plist->next) {
|
||
|
if (plist->data[0]==' ') i++;
|
||
|
else i = 0;
|
||
|
}
|
||
|
if (i < TT.context) matcheof++;
|
||
|
|
||
|
// Search for a place to apply this hunk. Match all context lines and
|
||
|
// lines to be removed.
|
||
|
plist = TT.plines;
|
||
|
buf = NULL;
|
||
|
i = 0;
|
||
|
|
||
|
// Start of for loop
|
||
|
if (TT.context) for (;;) {
|
||
|
char *data = get_line(TT.filein);
|
||
|
|
||
|
TT.linenum++;
|
||
|
|
||
|
// Skip lines of the hunk we'd be adding.
|
||
|
while (plist && *plist->data == "+-"[reverse]) {
|
||
|
if (data && !strcmp(data, plist->data+1)) {
|
||
|
if (++backwards == TT.context)
|
||
|
fdprintf(2,"Possibly reversed hunk %d at %ld\n",
|
||
|
TT.hunknum, TT.linenum);
|
||
|
} else backwards=0;
|
||
|
plist = plist->next;
|
||
|
}
|
||
|
|
||
|
// Is this EOF?
|
||
|
if (!data) {
|
||
|
// Does this hunk need to match EOF?
|
||
|
if (!plist && matcheof) break;
|
||
|
|
||
|
// File ended before we found a place for this hunk.
|
||
|
fail_hunk();
|
||
|
goto done;
|
||
|
}
|
||
|
check = dlist_add(&buf, data);
|
||
|
|
||
|
// todo: teach the strcmp() to ignore whitespace.
|
||
|
|
||
|
for (;;) {
|
||
|
// If we hit the end of a hunk that needed EOF and this isn't EOF,
|
||
|
// or next line doesn't match, flush first line of buffered data and
|
||
|
// recheck match until we find a new match or run out of buffer.
|
||
|
|
||
|
if (!plist || strcmp(check->data, plist->data+1)) {
|
||
|
// First line isn't a match, write it out.
|
||
|
TT.state = 3;
|
||
|
check = TOY_llist_pop(&buf);
|
||
|
check->prev->next = buf;
|
||
|
buf->prev = check->prev;
|
||
|
do_line(check);
|
||
|
plist = TT.plines;
|
||
|
|
||
|
// Out of buffered lines?
|
||
|
if (check==buf) {
|
||
|
buf = 0;
|
||
|
break;
|
||
|
}
|
||
|
check = buf;
|
||
|
} else {
|
||
|
// This line matches. Advance plist, detect successful match.
|
||
|
plist = plist->next;
|
||
|
if (!plist && !matcheof) goto out;
|
||
|
check = check->next;
|
||
|
if (check == buf) break;
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
out:
|
||
|
// Got it. Emit changed data.
|
||
|
TT.state = "-+"[reverse];
|
||
|
TOY_llist_free(TT.plines, do_line);
|
||
|
TT.plines = NULL;
|
||
|
TT.state = 1;
|
||
|
done:
|
||
|
if (buf) {
|
||
|
buf->prev->next = NULL;
|
||
|
TOY_llist_free(buf, do_line);
|
||
|
}
|
||
|
|
||
|
return TT.state;
|
||
|
}
|
||
|
|
||
|
// state 0: Not in a hunk, look for +++.
|
||
|
// state 1: Found +++ file indicator, look for @@
|
||
|
// state 2: In hunk: counting initial context lines
|
||
|
// state 3: In hunk: getting body
|
||
|
|
||
|
int patch_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
||
|
int patch_main(int argc UNUSED_PARAM, char **argv)
|
||
|
{
|
||
|
int opts;
|
||
|
int reverse, state = 0;
|
||
|
char *oldname = NULL, *newname = NULL;
|
||
|
char *opt_p, *opt_i;
|
||
|
int prefix;
|
||
|
|
||
|
long oldline = 0, oldlen = 0, newline = 0, newlen = 0;
|
||
|
|
||
|
INIT_TT();
|
||
|
|
||
|
opts = getopt32(argv, FLAG_STR, &opt_p, &opt_i);
|
||
|
reverse = opts & FLAG_REVERSE;
|
||
|
|
||
|
if (opts & FLAG_INPUT) xmove_fd(xopen(opt_i, O_RDONLY), STDIN_FILENO);
|
||
|
prefix = (opts & FLAG_PATHLEN) ? xatoi(opt_p) : 0; // can be negative!
|
||
|
TT.filein = TT.fileout = -1;
|
||
|
|
||
|
// Loop through the lines in the patch
|
||
|
for(;;) {
|
||
|
char *patchline;
|
||
|
|
||
|
patchline = get_line(STDIN_FILENO);
|
||
|
if (!patchline) break;
|
||
|
|
||
|
// Other versions of patch accept damaged patches,
|
||
|
// so we need to also.
|
||
|
if (!*patchline) {
|
||
|
free(patchline);
|
||
|
patchline = xstrdup(" ");
|
||
|
}
|
||
|
|
||
|
// Are we assembling a hunk?
|
||
|
if (state >= 2) {
|
||
|
if (*patchline==' ' || *patchline=='+' || *patchline=='-') {
|
||
|
dlist_add(&TT.plines, patchline);
|
||
|
|
||
|
if (*patchline != '+') oldlen--;
|
||
|
if (*patchline != '-') newlen--;
|
||
|
|
||
|
// Context line?
|
||
|
if (*patchline==' ' && state==2) TT.context++;
|
||
|
else state=3;
|
||
|
|
||
|
// If we've consumed all expected hunk lines, apply the hunk.
|
||
|
if (!oldlen && !newlen) state = apply_hunk();
|
||
|
continue;
|
||
|
}
|
||
|
fail_hunk();
|
||
|
state = 0;
|
||
|
continue;
|
||
|
}
|
||
|
|
||
|
// Open a new file?
|
||
|
if (!strncmp("--- ", patchline, 4) || !strncmp("+++ ", patchline, 4)) {
|
||
|
char *s, **name = &oldname;
|
||
|
int i;
|
||
|
|
||
|
if (*patchline == '+') {
|
||
|
name = &newname;
|
||
|
state = 1;
|
||
|
}
|
||
|
|
||
|
free(*name);
|
||
|
finish_oldfile();
|
||
|
|
||
|
// Trim date from end of filename (if any). We don't care.
|
||
|
for (s = patchline+4; *s && *s!='\t'; s++)
|
||
|
if (*s=='\\' && s[1]) s++;
|
||
|
i = atoi(s);
|
||
|
if (i && i<=1970)
|
||
|
*name = xstrdup("/dev/null");
|
||
|
else {
|
||
|
*s = 0;
|
||
|
*name = xstrdup(patchline+4);
|
||
|
}
|
||
|
|
||
|
// We defer actually opening the file because svn produces broken
|
||
|
// patches that don't signal they want to create a new file the
|
||
|
// way the patch man page says, so you have to read the first hunk
|
||
|
// and _guess_.
|
||
|
|
||
|
// Start a new hunk?
|
||
|
} else if (state == 1 && !strncmp("@@ -", patchline, 4)) {
|
||
|
int i;
|
||
|
|
||
|
i = sscanf(patchline+4, "%ld,%ld +%ld,%ld",
|
||
|
&oldline, &oldlen, &newline, &newlen);
|
||
|
if (i != 4)
|
||
|
bb_error_msg_and_die("corrupt hunk %d at %ld", TT.hunknum, TT.linenum);
|
||
|
|
||
|
TT.context = 0;
|
||
|
state = 2;
|
||
|
|
||
|
// If this is the first hunk, open the file.
|
||
|
if (TT.filein == -1) {
|
||
|
int oldsum, newsum, del = 0;
|
||
|
char *s, *name;
|
||
|
|
||
|
oldsum = oldline + oldlen;
|
||
|
newsum = 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)) {
|
||
|
name = reverse ? newname : oldname;
|
||
|
del++;
|
||
|
}
|
||
|
|
||
|
// handle -p path truncation.
|
||
|
for (i=0, s = name; *s;) {
|
||
|
if ((option_mask32 & FLAG_PATHLEN) && prefix == i)
|
||
|
break;
|
||
|
if (*(s++)=='/') {
|
||
|
name = s;
|
||
|
i++;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
if (del) {
|
||
|
printf("removing %s\n", name);
|
||
|
xunlink(name);
|
||
|
state = 0;
|
||
|
// If we've got a file to open, do so.
|
||
|
} else if (!(option_mask32 & FLAG_PATHLEN) || i <= prefix) {
|
||
|
// If the old file was null, we're creating a new one.
|
||
|
if (!strcmp(oldname, "/dev/null") || !oldsum) {
|
||
|
printf("creating %s\n", name);
|
||
|
s = strrchr(name, '/');
|
||
|
if (s) {
|
||
|
*s = 0;
|
||
|
xmkpath(name, -1);
|
||
|
*s = '/';
|
||
|
}
|
||
|
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.fileout = copy_tempfile(TT.filein, name, &TT.tempname);
|
||
|
TT.linenum = 0;
|
||
|
TT.hunknum = 0;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
TT.hunknum++;
|
||
|
|
||
|
continue;
|
||
|
}
|
||
|
|
||
|
// If we didn't continue above, discard this line.
|
||
|
free(patchline);
|
||
|
}
|
||
|
|
||
|
finish_oldfile();
|
||
|
|
||
|
if (ENABLE_FEATURE_CLEAN_UP) {
|
||
|
free(oldname);
|
||
|
free(newname);
|
||
|
}
|
||
|
|
||
|
return TT.exitval;
|
||
|
}
|