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authorDenys Vlasenko <vda.linux@googlemail.com>2009-10-24 22:39:51 (GMT)
committer Denys Vlasenko <vda.linux@googlemail.com>2009-10-24 22:39:51 (GMT)
commitb87d972817d39fc2c9a0c11ea2578431628bfd7d (patch)
treecad64a237b93a3e4bdd53b566e549808a57b40e4
parent6f2ebae8430234c104f011c53fa391e80abe589b (diff)
downloadbusybox-b87d972817d39fc2c9a0c11ea2578431628bfd7d.tar.gz
busybox-b87d972817d39fc2c9a0c11ea2578431628bfd7d.tar.bz2
patch: add Rob's version for reference, it may handle fuzz and offsets
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
-rw-r--r--editors/patch_toybox.c559
1 files changed, 559 insertions, 0 deletions
diff --git a/editors/patch_toybox.c b/editors/patch_toybox.c
new file mode 100644
index 0000000..f1e0de6
--- /dev/null
+++ b/editors/patch_toybox.c
@@ -0,0 +1,559 @@
+/* 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;
+}