431 lines
12 KiB
C
431 lines
12 KiB
C
/* patch.c - Apply a "universal" diff.
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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://opengroup.org/onlinepubs/9699919799/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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* -N ignore already applied
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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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*
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* -E remove empty files --remove-empty-files
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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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USE_PATCH(NEWTOY(patch, "(dry-run)"USE_TOYBOX_DEBUG("x")"d:ulp#i:R", TOYFLAG_USR|TOYFLAG_BIN))
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config PATCH
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bool "patch"
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default y
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help
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usage: patch [-d DIR] [-i file] [-p depth] [-Rlu] [--dry-run]
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Apply a unified diff to one or more files.
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-d modify files in DIR
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-i Input file (defaults=stdin)
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-l Loose match (ignore whitespace)
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-p Number of '/' to strip from start of file paths (default=all)
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-R Reverse patch.
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-u Ignored (only handles "unified" diffs)
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--dry-run Don't change files, just confirm patch applies
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This version of patch only handles unified diffs, and only modifies
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a file when all all hunks to that file apply. Patch prints failed
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hunks to stderr, and exits with nonzero status if any hunks fail.
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A file compared against /dev/null (or with a date <= the epoch) is
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created/deleted as appropriate.
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*/
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#define FOR_patch
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#include "toys.h"
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GLOBALS(
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char *infile;
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long prefix;
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char *dir;
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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, filein, fileout, filepatch, hunknum;
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char *tempname;
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)
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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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static void do_line(void *data)
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{
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struct double_list *dlist = (struct double_list *)data;
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if (TT.state>1 && *dlist->data != TT.state) {
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char *s = dlist->data+(TT.state>3 ? 1 : 0);
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int i = TT.state == 2 ? 2 : TT.fileout;
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xwrite(i, s, strlen(s));
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xwrite(i, "\n", 1);
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}
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if (toys.optflags & FLAG_x)
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fprintf(stderr, "DO %d: %s\n", TT.state, dlist->data);
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free(dlist->data);
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free(data);
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}
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static void finish_oldfile(void)
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{
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if (TT.tempname) replace_tempfile(TT.filein, TT.fileout, &TT.tempname);
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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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fprintf(stderr, "Hunk %d FAILED %ld/%ld.\n",
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TT.hunknum, TT.oldline, TT.newline);
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toys.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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llist_traverse(TT.current_hunk, do_line);
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TT.current_hunk = NULL;
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if (!(toys.optflags & FLAG_dry_run))
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delete_tempfile(TT.filein, TT.fileout, &TT.tempname);
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TT.state = 0;
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}
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// Compare ignoring whitespace. Just returns 0/1, no > or <
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static int loosecmp(char *aa, char *bb)
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{
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int a = 0, b = 0;
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for (;;) {
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while (isspace(aa[a])) a++;
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while (isspace(bb[b])) b++;
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if (aa[a] != bb[b]) return 1;
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if (!aa[a]) return 0;
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a++, b++;
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}
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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, trailing = 0, reverse = toys.optflags & FLAG_R, backwarn = 0;
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int (*lcmp)(char *aa, char *bb);
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lcmp = (toys.optflags & FLAG_l) ? (void *)loosecmp : (void *)strcmp;
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dlist_terminate(TT.current_hunk);
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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]==' ') trailing++;
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else trailing = 0;
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if (toys.optflags & FLAG_x) fprintf(stderr, "HUNK:%s\n", plist->data);
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}
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matcheof = !trailing || trailing < TT.context;
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if (toys.optflags & FLAG_x)
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fprintf(stderr,"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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for (;;) {
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char *data = get_line(TT.filein);
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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 && !lcmp(data, plist->data+1)) {
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if (!backwarn) backwarn = TT.linenum;
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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 (toys.optflags & FLAG_x) fprintf(stderr, "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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fprintf(stderr, "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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} else if (toys.optflags & FLAG_x) fprintf(stderr, "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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// 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 || lcmp(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 (toys.optflags & FLAG_x) {
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int bug = 0;
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if (!plist) fprintf(stderr, "NULL plist\n");
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else {
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while (plist->data[bug] == check->data[bug]) bug++;
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fprintf(stderr, "NOT(%d:%d!=%d): %s\n", bug, plist->data[bug],
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check->data[bug], plist->data);
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}
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}
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// If this hunk must match start of file, fail if it didn't.
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if (!TT.context || trailing>TT.context) {
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fail_hunk();
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goto done;
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}
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TT.state = 3;
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do_line(check = dlist_pop(&buf));
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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 (!buf) break;
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check = buf;
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} else {
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if (toys.optflags & FLAG_x) fprintf(stderr, "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];
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llist_traverse(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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dlist_terminate(buf);
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llist_traverse(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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void patch_main(void)
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{
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int reverse = toys.optflags&FLAG_R, state = 0, patchlinenum = 0,
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strip = 0;
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char *oldname = NULL, *newname = NULL;
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if (TT.infile) TT.filepatch = xopenro(TT.infile);
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TT.filein = TT.fileout = -1;
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if (TT.dir) xchdir(TT.dir);
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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 = get_line(TT.filepatch);
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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 (strip || !patchlinenum++) {
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int len = strlen(patchline);
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if (patchline[len-1] == '\r') {
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if (!strip) fprintf(stderr, "Removing DOS newlines\n");
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strip = 1;
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patchline[len-1]=0;
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}
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}
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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 != '+') TT.oldlen--;
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if (*patchline != '-') TT.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 (!TT.oldlen && !TT.newlen) state = apply_one_hunk();
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continue;
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}
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dlist_terminate(TT.current_hunk);
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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 = &oldname;
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int i;
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if (*patchline == '+') {
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name = &newname;
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state = 1;
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}
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free(*name);
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finish_oldfile();
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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) *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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// 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 = TT.newlen = 1;
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TT.oldline = strtol(s, &s, 10);
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if (*s == ',') TT.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 = strtol(s+1, &s, 10);
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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, del = 0;
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char *name;
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oldsum = TT.oldline + TT.oldlen;
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newsum = TT.newline + TT.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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{
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name = reverse ? newname : oldname;
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del++;
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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 ((toys.optflags & FLAG_p) && TT.prefix == i) break;
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if (*s++ != '/') continue;
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while (*s == '/') s++;
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name = s;
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i++;
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}
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if (del) {
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printf("removing %s\n", name);
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xunlink(name);
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state = 0;
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// If we've got a file to open, do so.
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} else if (!(toys.optflags & FLAG_p) || i <= TT.prefix) {
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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) && access(name, F_OK))
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{
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printf("creating %s\n", name);
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if (mkpathat(AT_FDCWD, name, 0, 2))
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perror_exit("mkpath %s", name);
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TT.filein = xcreate(name, O_CREAT|O_EXCL|O_RDWR, 0666);
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} else {
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printf("patching %s\n", name);
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TT.filein = xopenro(name);
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}
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if (toys.optflags & FLAG_dry_run)
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TT.fileout = xopen("/dev/null", O_RDWR);
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else TT.fileout = copy_tempfile(TT.filein, name, &TT.tempname);
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TT.linenum = 0;
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TT.hunknum = 0;
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}
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}
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TT.hunknum++;
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continue;
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}
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// If we didn't continue above, discard this line.
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free(patchline);
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}
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finish_oldfile();
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if (CFG_TOYBOX_FREE) {
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close(TT.filepatch);
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free(oldname);
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free(newname);
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}
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}
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