mirror of
https://github.com/sheumann/hush.git
synced 2024-08-16 09:29:16 +00:00
Signed-off-by: Rob Landley <rob@landley.net> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
553 lines
14 KiB
C
553 lines
14 KiB
C
/* vi: set sw=4 ts=4:
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*
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* Apply a "universal" diff.
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* Adapted from toybox's patch implementation.
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*
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* Copyright 2007 Rob Landley <rob@landley.net>
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*
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* see http://www.opengroup.org/onlinepubs/009695399/utilities/patch.html
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* (But only does -u, because who still cares about "ed"?)
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*
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* TODO:
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* -b backup
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* -l treat all whitespace as a single space
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* -d chdir first
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* -D define wrap #ifdef and #ifndef around changes
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* -o outfile output here instead of in place
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* -r rejectfile write rejected hunks to this file
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* --dry-run (regression!)
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*
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* -f force (no questions asked)
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* -F fuzz (number, default 2)
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* [file] which file to patch
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*/
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//config:config PATCH
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//config: bool "patch"
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//config: default y
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//config: help
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//config: Apply a unified diff formatted patch.
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//applet:IF_PATCH(APPLET(patch, BB_DIR_USR_BIN, BB_SUID_DROP))
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//kbuild:lib-$(CONFIG_PATCH) += patch.o
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//usage:#define patch_trivial_usage
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//usage: "[OPTIONS] [ORIGFILE [PATCHFILE]]"
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//usage:#define patch_full_usage "\n\n"
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//usage: IF_LONG_OPTS(
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//usage: " -p,--strip N Strip N leading components from file names"
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//usage: "\n -i,--input DIFF Read DIFF instead of stdin"
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//usage: "\n -R,--reverse Reverse patch"
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//usage: "\n -N,--forward Ignore already applied patches"
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/*usage: "\n --dry-run Don't actually change files" - TODO */
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//usage: "\n -E,--remove-empty-files Remove output files if they become empty"
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//usage: )
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//usage: IF_NOT_LONG_OPTS(
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//usage: " -p N Strip N leading components from file names"
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//usage: "\n -i DIFF Read DIFF instead of stdin"
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//usage: "\n -R Reverse patch"
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//usage: "\n -N Ignore already applied patches"
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//usage: "\n -E Remove output files if they become empty"
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//usage: )
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/* -u "interpret as unified diff" is supported but not documented: this info is not useful for --help */
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/* -x "debug" is supported but does nothing */
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//usage:
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//usage:#define patch_example_usage
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//usage: "$ patch -p1 < example.diff\n"
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//usage: "$ patch -p0 -i example.diff"
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#include "libbb.h"
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// libbb candidate?
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struct double_list {
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struct double_list *next;
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struct double_list *prev;
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char *data;
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};
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// Free all the elements of a linked list
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// Call freeit() on each element before freeing it.
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static void dlist_free(struct double_list *list, void (*freeit)(void *data))
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{
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while (list) {
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void *pop = list;
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list = list->next;
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freeit(pop);
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// Bail out also if list is circular.
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if (list == pop) break;
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}
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}
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// Add an entry before "list" element in (circular) doubly linked list
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static struct double_list *dlist_add(struct double_list **list, char *data)
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{
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struct double_list *llist;
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struct double_list *line = xmalloc(sizeof(*line));
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line->data = data;
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llist = *list;
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if (llist) {
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struct double_list *p;
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line->next = llist;
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p = line->prev = llist->prev;
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// (list is circular, we assume p is never NULL)
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p->next = line;
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llist->prev = line;
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} else
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*list = line->next = line->prev = line;
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return line;
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}
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struct globals {
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char *infile;
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long prefix;
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struct double_list *current_hunk;
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long oldline, oldlen, newline, newlen;
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long linenum;
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int context, state, hunknum;
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int filein, fileout;
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char *tempname;
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int exitval;
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};
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#define TT (*ptr_to_globals)
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#define INIT_TT() do { \
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SET_PTR_TO_GLOBALS(xzalloc(sizeof(TT))); \
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} while (0)
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#define FLAG_STR "Rup:i:NEx"
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/* FLAG_REVERSE must be == 1! Code uses this fact. */
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#define FLAG_REVERSE (1 << 0)
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#define FLAG_u (1 << 1)
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#define FLAG_PATHLEN (1 << 2)
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#define FLAG_INPUT (1 << 3)
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#define FLAG_IGNORE (1 << 4)
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#define FLAG_RMEMPTY (1 << 5)
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/* Enable this bit and use -x for debug output: */
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#define FLAG_DEBUG (0 << 6)
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// Dispose of a line of input, either by writing it out or discarding it.
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// state < 2: just free
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// state = 2: write whole line to stderr
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// state = 3: write whole line to fileout
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// state > 3: write line+1 to fileout when *line != state
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#define PATCH_DEBUG (option_mask32 & FLAG_DEBUG)
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static void do_line(void *data)
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{
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struct double_list *dlist = data;
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if (TT.state>1 && *dlist->data != TT.state)
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fdprintf(TT.state == 2 ? 2 : TT.fileout,
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"%s\n", dlist->data+(TT.state>3 ? 1 : 0));
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if (PATCH_DEBUG) fdprintf(2, "DO %d: %s\n", TT.state, dlist->data);
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free(dlist->data);
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free(dlist);
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}
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static void finish_oldfile(void)
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{
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if (TT.tempname) {
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// Copy the rest of the data and replace the original with the copy.
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char *temp;
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if (TT.filein != -1) {
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bb_copyfd_eof(TT.filein, TT.fileout);
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xclose(TT.filein);
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}
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xclose(TT.fileout);
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temp = xstrdup(TT.tempname);
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temp[strlen(temp) - 6] = '\0';
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rename(TT.tempname, temp);
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free(temp);
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free(TT.tempname);
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TT.tempname = NULL;
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}
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TT.fileout = TT.filein = -1;
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}
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static void fail_hunk(void)
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{
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if (!TT.current_hunk) return;
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fdprintf(2, "Hunk %d FAILED %ld/%ld.\n", TT.hunknum, TT.oldline, TT.newline);
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TT.exitval = 1;
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// If we got to this point, we've seeked to the end. Discard changes to
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// this file and advance to next file.
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TT.state = 2;
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TT.current_hunk->prev->next = NULL;
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dlist_free(TT.current_hunk, do_line);
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TT.current_hunk = NULL;
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// Abort the copy and delete the temporary file.
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close(TT.filein);
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close(TT.fileout);
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unlink(TT.tempname);
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free(TT.tempname);
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TT.tempname = NULL;
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TT.state = 0;
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}
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// Given a hunk of a unified diff, make the appropriate change to the file.
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// This does not use the location information, but instead treats a hunk
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// as a sort of regex. Copies data from input to output until it finds
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// the change to be made, then outputs the changed data and returns.
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// (Finding EOF first is an error.) This is a single pass operation, so
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// multiple hunks must occur in order in the file.
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static int apply_one_hunk(void)
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{
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struct double_list *plist, *buf = NULL, *check;
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int matcheof = 0, reverse = option_mask32 & FLAG_REVERSE, backwarn = 0;
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/* Do we try "dummy" revert to check whether
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* to silently skip this hunk? Used to implement -N.
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*/
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int dummy_revert = 0;
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// Break doubly linked list so we can use singly linked traversal function.
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TT.current_hunk->prev->next = NULL;
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// Match EOF if there aren't as many ending context lines as beginning
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for (plist = TT.current_hunk; plist; plist = plist->next) {
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if (plist->data[0]==' ') matcheof++;
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else matcheof = 0;
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if (PATCH_DEBUG) fdprintf(2, "HUNK:%s\n", plist->data);
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}
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matcheof = !matcheof || matcheof < TT.context;
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if (PATCH_DEBUG) fdprintf(2,"MATCHEOF=%c\n", matcheof ? 'Y' : 'N');
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// Loop through input data searching for this hunk. Match all context
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// lines and all lines to be removed until we've found the end of a
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// complete hunk.
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plist = TT.current_hunk;
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buf = NULL;
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if (reverse ? TT.oldlen : TT.newlen) for (;;) {
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char *data = xmalloc_reads(TT.filein, NULL);
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TT.linenum++;
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// Figure out which line of hunk to compare with next. (Skip lines
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// of the hunk we'd be adding.)
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while (plist && *plist->data == "+-"[reverse]) {
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if (data && !strcmp(data, plist->data+1)) {
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if (!backwarn) {
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backwarn = TT.linenum;
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if (option_mask32 & FLAG_IGNORE) {
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dummy_revert = 1;
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reverse ^= 1;
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continue;
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}
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}
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}
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plist = plist->next;
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}
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// Is this EOF?
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if (!data) {
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if (PATCH_DEBUG) fdprintf(2, "INEOF\n");
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// Does this hunk need to match EOF?
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if (!plist && matcheof) break;
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if (backwarn)
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fdprintf(2,"Possibly reversed hunk %d at %ld\n",
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TT.hunknum, TT.linenum);
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// File ended before we found a place for this hunk.
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fail_hunk();
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goto done;
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}
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if (PATCH_DEBUG) fdprintf(2, "IN: %s\n", data);
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check = dlist_add(&buf, data);
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// Compare this line with next expected line of hunk.
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// todo: teach the strcmp() to ignore whitespace.
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// A match can fail because the next line doesn't match, or because
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// we hit the end of a hunk that needed EOF, and this isn't EOF.
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// If match failed, flush first line of buffered data and
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// recheck buffered data for a new match until we find one or run
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// out of buffer.
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for (;;) {
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if (!plist || strcmp(check->data, plist->data+1)) {
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// Match failed. Write out first line of buffered data and
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// recheck remaining buffered data for a new match.
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if (PATCH_DEBUG)
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fdprintf(2, "NOT: %s\n", plist->data);
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TT.state = 3;
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check = buf;
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buf = buf->next;
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check->prev->next = buf;
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buf->prev = check->prev;
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do_line(check);
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plist = TT.current_hunk;
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// If we've reached the end of the buffer without confirming a
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// match, read more lines.
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if (check == buf) {
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buf = NULL;
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break;
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}
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check = buf;
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} else {
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if (PATCH_DEBUG)
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fdprintf(2, "MAYBE: %s\n", plist->data);
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// This line matches. Advance plist, detect successful match.
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plist = plist->next;
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if (!plist && !matcheof) goto out;
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check = check->next;
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if (check == buf) break;
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}
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}
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}
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out:
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// We have a match. Emit changed data.
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TT.state = "-+"[reverse ^ dummy_revert];
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dlist_free(TT.current_hunk, do_line);
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TT.current_hunk = NULL;
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TT.state = 1;
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done:
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if (buf) {
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buf->prev->next = NULL;
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dlist_free(buf, do_line);
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}
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return TT.state;
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}
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// Read a patch file and find hunks, opening/creating/deleting files.
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// Call apply_one_hunk() on each hunk.
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// state 0: Not in a hunk, look for +++.
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// state 1: Found +++ file indicator, look for @@
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// state 2: In hunk: counting initial context lines
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// state 3: In hunk: getting body
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int patch_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int patch_main(int argc UNUSED_PARAM, char **argv)
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{
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int opts;
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int reverse, state = 0;
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char *oldname = NULL, *newname = NULL;
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char *opt_p, *opt_i;
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long oldlen = oldlen; /* for compiler */
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long newlen = newlen; /* for compiler */
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INIT_TT();
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opts = getopt32(argv, FLAG_STR, &opt_p, &opt_i);
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argv += optind;
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reverse = opts & FLAG_REVERSE;
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TT.prefix = (opts & FLAG_PATHLEN) ? xatoi(opt_p) : 0; // can be negative!
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TT.filein = TT.fileout = -1;
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if (opts & FLAG_INPUT) {
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xmove_fd(xopen_stdin(opt_i), STDIN_FILENO);
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} else {
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if (argv[0] && argv[1]) {
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xmove_fd(xopen_stdin(argv[1]), STDIN_FILENO);
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}
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}
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if (argv[0]) {
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oldname = xstrdup(argv[0]);
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newname = xstrdup(argv[0]);
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}
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// Loop through the lines in the patch
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for(;;) {
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char *patchline;
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patchline = xmalloc_fgetline(stdin);
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if (!patchline) break;
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// Other versions of patch accept damaged patches,
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// so we need to also.
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if (!*patchline) {
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free(patchline);
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patchline = xstrdup(" ");
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}
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// Are we assembling a hunk?
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if (state >= 2) {
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if (*patchline==' ' || *patchline=='+' || *patchline=='-') {
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dlist_add(&TT.current_hunk, patchline);
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if (*patchline != '+') oldlen--;
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if (*patchline != '-') newlen--;
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// Context line?
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if (*patchline==' ' && state==2) TT.context++;
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else state=3;
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// If we've consumed all expected hunk lines, apply the hunk.
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if (!oldlen && !newlen) state = apply_one_hunk();
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continue;
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}
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fail_hunk();
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state = 0;
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continue;
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}
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// Open a new file?
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if (!strncmp("--- ", patchline, 4) || !strncmp("+++ ", patchline, 4)) {
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char *s, **name = reverse ? &newname : &oldname;
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int i;
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if (*patchline == '+') {
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name = reverse ? &oldname : &newname;
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state = 1;
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}
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finish_oldfile();
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if (!argv[0]) {
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free(*name);
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// Trim date from end of filename (if any). We don't care.
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for (s = patchline+4; *s && *s!='\t'; s++)
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if (*s=='\\' && s[1]) s++;
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i = atoi(s);
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if (i>1900 && i<=1970)
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*name = xstrdup("/dev/null");
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else {
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*s = 0;
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*name = xstrdup(patchline+4);
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}
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}
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// We defer actually opening the file because svn produces broken
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// patches that don't signal they want to create a new file the
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// way the patch man page says, so you have to read the first hunk
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// and _guess_.
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// Start a new hunk? Usually @@ -oldline,oldlen +newline,newlen @@
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// but a missing ,value means the value is 1.
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} else if (state == 1 && !strncmp("@@ -", patchline, 4)) {
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int i;
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char *s = patchline+4;
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// Read oldline[,oldlen] +newline[,newlen]
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TT.oldlen = oldlen = TT.newlen = newlen = 1;
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TT.oldline = strtol(s, &s, 10);
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if (*s == ',') TT.oldlen = oldlen = strtol(s+1, &s, 10);
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TT.newline = strtol(s+2, &s, 10);
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if (*s == ',') TT.newlen = newlen = strtol(s+1, &s, 10);
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if (oldlen < 1 && newlen < 1)
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bb_error_msg_and_die("Really? %s", patchline);
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TT.context = 0;
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state = 2;
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// If this is the first hunk, open the file.
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if (TT.filein == -1) {
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int oldsum, newsum, empty = 0;
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char *name;
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oldsum = TT.oldline + oldlen;
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newsum = TT.newline + newlen;
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name = reverse ? oldname : newname;
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// We're deleting oldname if new file is /dev/null (before -p)
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// or if new hunk is empty (zero context) after patching
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if (!strcmp(name, "/dev/null") || !(reverse ? oldsum : newsum)) {
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name = reverse ? newname : oldname;
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empty++;
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}
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// handle -p path truncation.
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for (i = 0, s = name; *s;) {
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if ((option_mask32 & FLAG_PATHLEN) && TT.prefix == i)
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break;
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if (*s++ != '/')
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continue;
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while (*s == '/')
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s++;
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i++;
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name = s;
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}
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if (empty) {
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// File is empty after the patches have been applied
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state = 0;
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if (option_mask32 & FLAG_RMEMPTY) {
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// If flag -E or --remove-empty-files is set
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printf("removing %s\n", name);
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xunlink(name);
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} else {
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printf("patching file %s\n", name);
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xclose(xopen(name, O_WRONLY | O_TRUNC));
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}
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// If we've got a file to open, do so.
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} else if (!(option_mask32 & FLAG_PATHLEN) || i <= TT.prefix) {
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struct stat statbuf;
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// If the old file was null, we're creating a new one.
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if (!strcmp(oldname, "/dev/null") || !oldsum) {
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printf("creating %s\n", name);
|
|
s = strrchr(name, '/');
|
|
if (s) {
|
|
*s = 0;
|
|
bb_make_directory(name, -1, FILEUTILS_RECUR);
|
|
*s = '/';
|
|
}
|
|
TT.filein = xopen(name, O_CREAT|O_EXCL|O_RDWR);
|
|
} else {
|
|
printf("patching file %s\n", name);
|
|
TT.filein = xopen(name, O_RDONLY);
|
|
}
|
|
|
|
TT.tempname = xasprintf("%sXXXXXX", name);
|
|
TT.fileout = xmkstemp(TT.tempname);
|
|
// Set permissions of output file
|
|
fstat(TT.filein, &statbuf);
|
|
fchmod(TT.fileout, statbuf.st_mode);
|
|
|
|
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;
|
|
}
|