Edit
IABSD.fr/src/usr.bin/patch/patch.c
kirill
- usr.bin/patch/patch.c
-
/* $OpenBSD: patch.c,v 1.79 2026/04/03 12:58:40 kirill Exp $ */ /* * patch - a program to apply diffs to original files * * Copyright 1986, Larry Wall * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following condition is met: * 1. Redistributions of source code must retain the above copyright notice, * this condition and the following disclaimer. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * -C option added in 1998, original code by Marc Espie, based on FreeBSD * behaviour */ #include <sys/types.h> #include <sys/stat.h> #include <unistd.h> #include <ctype.h> #include <getopt.h> #include <libgen.h> #include <limits.h> #include <paths.h> #include <stdio.h> #include <string.h> #include <stdlib.h> #include "common.h" #include "util.h" #include "pch.h" #include "inp.h" #include "backupfile.h" #include "ed.h" mode_t filemode = 0644; char *buf; /* general purpose buffer */ size_t bufsz; /* general purpose buffer size */ bool using_plan_a = true; /* try to keep everything in memory */ bool out_of_mem = false; /* ran out of memory in plan a */ #define MAXFILEC 2 char *filearg[MAXFILEC]; bool ok_to_create_file = false; char *outname = NULL; char *origprae = NULL; char *TMPOUTNAME; char *TMPINNAME; char *TMPREJNAME; char *TMPPATNAME; bool toutkeep = false; bool trejkeep = false; bool warn_on_invalid_line; bool last_line_missing_eol; #ifdef DEBUGGING int debug = 0; #endif bool force = false; bool batch = false; bool verbose = true; bool reverse = false; bool noreverse = false; bool skip_rest_of_patch = false; int strippath = 957; bool canonicalize = false; bool check_only = false; int diff_type = 0; char *revision = NULL; /* prerequisite revision, if any */ LINENUM input_lines = 0; /* how long is input file in lines */ int posix = 0; /* strict POSIX mode? */ static void reinitialize_almost_everything(void); static void get_some_switches(void); static LINENUM locate_hunk(LINENUM); static void abort_context_hunk(void); static void rej_line(int, LINENUM); static void abort_hunk(void); static void apply_hunk(LINENUM); static void init_output(const char *); static void init_reject(const char *); static void copy_till(LINENUM, bool); static void spew_output(void); static void dump_line(LINENUM, bool); static bool patch_match(LINENUM, LINENUM, LINENUM); static bool similar(const char *, const char *, ssize_t); static __dead void usage(void); /* true if -E was specified on command line. */ static bool remove_empty_files = false; /* true if -R was specified on command line. */ static bool reverse_flag_specified = false; static bool Vflag = false; /* buffer holding the name of the rejected patch file. */ static char rejname[PATH_MAX]; /* how many input lines have been irretractibly output */ static LINENUM last_frozen_line = 0; static int Argc; /* guess */ static char **Argv; static int Argc_last; /* for restarting plan_b */ static char **Argv_last; static FILE *ofp = NULL; /* output file pointer */ static FILE *rejfp = NULL; /* reject file pointer */ static int filec = 0; /* how many file arguments? */ static LINENUM last_offset = 0; static LINENUM maxfuzz = 2; /* patch using ifdef, ifndef, etc. */ static bool do_defines = false; /* #ifdef xyzzy */ static char if_defined[128]; /* #ifndef xyzzy */ static char not_defined[128]; /* #else */ static const char else_defined[] = "#else\n"; /* #endif xyzzy */ static char end_defined[128]; /* Apply a set of diffs as appropriate. */ int main(int argc, char *argv[]) { int error = 0, hunk, failed, i, fd; bool patch_seen; LINENUM where = 0, newwhere, fuzz, mymaxfuzz; const char *tmpdir; char *v; if (pledge("stdio rpath wpath cpath fattr unveil", NULL) == -1) { perror("pledge"); my_exit(2); } bufsz = INITLINELEN; if ((buf = malloc(bufsz)) == NULL) pfatal("allocating input buffer"); buf[0] = '\0'; setvbuf(stdout, NULL, _IOLBF, 0); setvbuf(stderr, NULL, _IOLBF, 0); for (i = 0; i < MAXFILEC; i++) filearg[i] = NULL; /* Cons up the names of the temporary files. */ if ((tmpdir = getenv("TMPDIR")) == NULL || *tmpdir == '\0') tmpdir = _PATH_TMP; for (i = strlen(tmpdir) - 1; i > 0 && tmpdir[i] == '/'; i--) ; i++; if (asprintf(&TMPOUTNAME, "%.*s/patchoXXXXXXXXXX", i, tmpdir) == -1) fatal("cannot allocate memory"); if ((fd = mkstemp(TMPOUTNAME)) == -1) pfatal("can't create %s", TMPOUTNAME); close(fd); if (asprintf(&TMPINNAME, "%.*s/patchiXXXXXXXXXX", i, tmpdir) == -1) fatal("cannot allocate memory"); if ((fd = mkstemp(TMPINNAME)) == -1) pfatal("can't create %s", TMPINNAME); close(fd); if (asprintf(&TMPREJNAME, "%.*s/patchrXXXXXXXXXX", i, tmpdir) == -1) fatal("cannot allocate memory"); if ((fd = mkstemp(TMPREJNAME)) == -1) pfatal("can't create %s", TMPREJNAME); close(fd); if (asprintf(&TMPPATNAME, "%.*s/patchpXXXXXXXXXX", i, tmpdir) == -1) fatal("cannot allocate memory"); if ((fd = mkstemp(TMPPATNAME)) == -1) pfatal("can't create %s", TMPPATNAME); close(fd); v = getenv("SIMPLE_BACKUP_SUFFIX"); if (v) simple_backup_suffix = v; else simple_backup_suffix = ORIGEXT; /* parse switches */ Argc = argc; Argv = argv; get_some_switches(); if (unveil(tmpdir, "rwc") == -1) { perror("unveil"); my_exit(2); } if (outname != NULL) if (unveil(outname, "rwc") == -1) { perror("unveil"); my_exit(2); } if (filearg[0] != NULL) { char *origdir; if (unveil(filearg[0], "rwc") == -1) { perror("unveil"); my_exit(2); } if ((origdir = dirname(filearg[0])) == NULL) { perror("dirname"); my_exit(2); } if (unveil(origdir, "rwc") == -1) { perror("unveil"); my_exit(2); } } else { if (unveil(".", "rwc") == -1) { perror("unveil"); my_exit(2); } } if (filearg[1] != NULL) if (unveil(filearg[1], "r") == -1) { perror("unveil"); my_exit(2); } if (!force && !batch) if (unveil(_PATH_TTY, "r") == -1) { perror("unveil"); my_exit(2); } if (*rejname != '\0') if (unveil(rejname, "rwc") == -1) { perror("unveil"); my_exit(2); } if (pledge("stdio rpath wpath cpath fattr", NULL) == -1) { perror("pledge"); my_exit(2); } if (!Vflag) { if ((v = getenv("PATCH_VERSION_CONTROL")) == NULL) v = getenv("VERSION_CONTROL"); if (v != NULL || !posix) backup_type = get_version(v); /* OK to pass NULL. */ } /* make sure we clean up /tmp in case of disaster */ set_signals(0); patch_seen = false; for (open_patch_file(filearg[1]); there_is_another_patch(); reinitialize_almost_everything()) { /* for each patch in patch file */ patch_seen = true; warn_on_invalid_line = true; if (outname == NULL) outname = xstrdup(filearg[0]); /* initialize the patched file */ if (!skip_rest_of_patch) init_output(TMPOUTNAME); /* initialize reject file */ init_reject(TMPREJNAME); /* find out where all the lines are */ if (!skip_rest_of_patch) scan_input(filearg[0]); /* for ed script just up and do it and exit */ if (diff_type == ED_DIFF) { do_ed_script(); if (ofp) fclose(ofp); ofp = NULL; if (rejfp) fclose(rejfp); rejfp = NULL; continue; } /* from here on, open no standard i/o files, because malloc */ /* might misfire and we can't catch it easily */ /* apply each hunk of patch */ hunk = 0; failed = 0; out_of_mem = false; while (another_hunk()) { hunk++; fuzz = 0; mymaxfuzz = pch_context(); if (maxfuzz < mymaxfuzz) mymaxfuzz = maxfuzz; if (!skip_rest_of_patch) { do { where = locate_hunk(fuzz); if ((hunk == 1 && where == 0 && !force) || (where == 1 && pch_ptrn_lines() == 0 && !force)) { /* dwim for reversed patch? */ if (!pch_swap()) { if (fuzz == 0) say("Not enough memory to try swapped hunk! Assuming unswapped.\n"); continue; } reverse = !reverse; /* try again */ where = locate_hunk(fuzz); if (where == 0) { /* didn't find it swapped */ if (!pch_swap()) /* put it back to normal */ fatal("lost hunk on alloc error!\n"); reverse = !reverse; /* restore position if this patch creates a file */ if (pch_ptrn_lines() == 0) where = 1; } else if (noreverse) { if (!pch_swap()) /* put it back to normal */ fatal("lost hunk on alloc error!\n"); reverse = !reverse; say("Ignoring previously applied (or reversed) patch.\n"); skip_rest_of_patch = true; } else if (batch) { if (verbose) say("%seversed (or previously applied) patch detected! %s -R.", reverse ? "R" : "Unr", reverse ? "Assuming" : "Ignoring"); } else { ask("%seversed (or previously applied) patch detected! %s -R? [y] ", reverse ? "R" : "Unr", reverse ? "Assume" : "Ignore"); if (*buf == 'n') { ask("Apply anyway? [n] "); if (*buf != 'y') skip_rest_of_patch = true; where = 0; reverse = !reverse; if (!pch_swap()) /* put it back to normal */ fatal("lost hunk on alloc error!\n"); } } } } while (!skip_rest_of_patch && where == 0 && ++fuzz <= mymaxfuzz); if (skip_rest_of_patch) { /* just got decided */ fclose(ofp); ofp = NULL; } } newwhere = pch_newfirst() + last_offset; if (skip_rest_of_patch) { abort_hunk(); failed++; if (verbose) say("Hunk #%d ignored at %ld.\n", hunk, newwhere); } else if (where == 0) { abort_hunk(); failed++; if (verbose) say("Hunk #%d failed at %ld.\n", hunk, newwhere); } else { apply_hunk(where); if (verbose) { say("Hunk #%d succeeded at %ld", hunk, newwhere); if (fuzz != 0) say(" with fuzz %ld", fuzz); if (last_offset) say(" (offset %ld line%s)", last_offset, last_offset == 1L ? "" : "s"); say(".\n"); } } } if (out_of_mem && using_plan_a) { Argc = Argc_last; Argv = Argv_last; say("\n\nRan out of memory using Plan A--trying again...\n\n"); if (ofp) fclose(ofp); ofp = NULL; if (rejfp) fclose(rejfp); rejfp = NULL; continue; } if (hunk == 0) fatal("Internal error: hunk should not be 0\n"); /* finish spewing out the new file */ if (!skip_rest_of_patch) spew_output(); /* and put the output where desired */ ignore_signals(); if (!skip_rest_of_patch) { struct stat statbuf; char *realout = outname; if (!check_only) { if (move_file(TMPOUTNAME, outname) < 0) { toutkeep = true; realout = TMPOUTNAME; chmod(TMPOUTNAME, filemode); } else chmod(outname, filemode); if (remove_empty_files && stat(realout, &statbuf) == 0 && statbuf.st_size == 0) { if (verbose) say("Removing %s (empty after patching).\n", realout); unlink(realout); } } } fclose(rejfp); rejfp = NULL; if (failed) { error = 1; if (*rejname == '\0') { if (strlcpy(rejname, outname, sizeof(rejname)) >= sizeof(rejname)) fatal("filename %s is too long\n", outname); if (strlcat(rejname, REJEXT, sizeof(rejname)) >= sizeof(rejname)) fatal("filename %s is too long\n", outname); } if (!check_only) say("%d out of %d hunks %s--saving rejects to %s\n", failed, hunk, skip_rest_of_patch ? "ignored" : "failed", rejname); else say("%d out of %d hunks %s\n", failed, hunk, skip_rest_of_patch ? "ignored" : "failed"); if (!check_only && move_file(TMPREJNAME, rejname) < 0) trejkeep = true; } set_signals(1); } if (!patch_seen) error = 2; my_exit(error); /* NOTREACHED */ } /* Prepare to find the next patch to do in the patch file. */ static void reinitialize_almost_everything(void) { re_patch(); re_input(); input_lines = 0; last_frozen_line = 0; filec = 0; if (!out_of_mem) { free(filearg[0]); filearg[0] = NULL; } free(outname); outname = NULL; last_offset = 0; diff_type = 0; free(revision); revision = NULL; reverse = reverse_flag_specified; skip_rest_of_patch = false; get_some_switches(); } /* Process switches and filenames. */ static void get_some_switches(void) { const char *options = "b::B:cCd:D:eEfF:i:lnNo:p:r:RstuvV:x:z:"; static struct option longopts[] = { {"backup", no_argument, 0, 'b'}, {"batch", no_argument, 0, 't'}, {"check", no_argument, 0, 'C'}, {"context", no_argument, 0, 'c'}, {"debug", required_argument, 0, 'x'}, {"directory", required_argument, 0, 'd'}, {"dry-run", no_argument, 0, 'C'}, {"ed", no_argument, 0, 'e'}, {"force", no_argument, 0, 'f'}, {"forward", no_argument, 0, 'N'}, {"fuzz", required_argument, 0, 'F'}, {"ifdef", required_argument, 0, 'D'}, {"input", required_argument, 0, 'i'}, {"ignore-whitespace", no_argument, 0, 'l'}, {"normal", no_argument, 0, 'n'}, {"output", required_argument, 0, 'o'}, {"prefix", required_argument, 0, 'B'}, {"quiet", no_argument, 0, 's'}, {"reject-file", required_argument, 0, 'r'}, {"remove-empty-files", no_argument, 0, 'E'}, {"reverse", no_argument, 0, 'R'}, {"silent", no_argument, 0, 's'}, {"strip", required_argument, 0, 'p'}, {"suffix", required_argument, 0, 'z'}, {"unified", no_argument, 0, 'u'}, {"version", no_argument, 0, 'v'}, {"version-control", required_argument, 0, 'V'}, {"posix", no_argument, &posix, 1}, {NULL, 0, 0, 0} }; int ch; const char *errstr; rejname[0] = '\0'; Argc_last = Argc; Argv_last = Argv; if (!Argc) return; optreset = optind = 1; while ((ch = getopt_long(Argc, Argv, options, longopts, NULL)) != -1) { switch (ch) { case 'b': if (backup_type == none) backup_type = numbered_existing; if (optarg == NULL) break; if (verbose) say("Warning, the ``-b suffix'' option has been" " obsoleted by the -z option.\n"); /* FALLTHROUGH */ case 'z': /* must directly follow 'b' case for backwards compat */ simple_backup_suffix = xstrdup(optarg); break; case 'B': origprae = xstrdup(optarg); break; case 'c': diff_type = CONTEXT_DIFF; break; case 'C': check_only = true; break; case 'd': if (chdir(optarg) == -1) pfatal("can't cd to %s", optarg); break; case 'D': do_defines = true; if (!isalpha((unsigned char)*optarg) && *optarg != '_') fatal("argument to -D is not an identifier\n"); snprintf(if_defined, sizeof if_defined, "#ifdef %s\n", optarg); snprintf(not_defined, sizeof not_defined, "#ifndef %s\n", optarg); snprintf(end_defined, sizeof end_defined, "#endif /* %s */\n", optarg); break; case 'e': diff_type = ED_DIFF; break; case 'E': remove_empty_files = true; break; case 'f': force = true; break; case 'F': maxfuzz = strtonum(optarg, 0, INT_MAX, &errstr); if (errstr != NULL) fatal("maximum fuzz is %s: %s\n", errstr, optarg); break; case 'i': if (++filec == MAXFILEC) fatal("too many file arguments\n"); filearg[filec] = xstrdup(optarg); break; case 'l': canonicalize = true; break; case 'n': diff_type = NORMAL_DIFF; break; case 'N': noreverse = true; break; case 'o': outname = xstrdup(optarg); break; case 'p': strippath = strtonum(optarg, 0, INT_MAX, &errstr); if (errstr != NULL) fatal("strip count is %s: %s\n", errstr, optarg); break; case 'r': if (strlcpy(rejname, optarg, sizeof(rejname)) >= sizeof(rejname)) fatal("argument for -r is too long\n"); break; case 'R': reverse = true; reverse_flag_specified = true; break; case 's': verbose = false; break; case 't': batch = true; break; case 'u': diff_type = UNI_DIFF; break; case 'v': version(); break; case 'V': backup_type = get_version(optarg); Vflag = true; break; #ifdef DEBUGGING case 'x': debug = strtonum(optarg, 0, INT_MAX, &errstr); if (errstr != NULL) fatal("debug number is %s: %s\n", errstr, optarg); break; #endif default: if (ch != '\0') usage(); break; } } Argc -= optind; Argv += optind; if (Argc > 0) { filearg[0] = xstrdup(*Argv++); Argc--; while (Argc > 0) { if (++filec == MAXFILEC) fatal("too many file arguments\n"); filearg[filec] = xstrdup(*Argv++); Argc--; } } if (getenv("POSIXLY_CORRECT") != NULL) posix = 1; } static __dead void usage(void) { fprintf(stderr, "usage: patch [-bCcEeflNnRstuv] [-B backup-prefix] [-D symbol] [-d directory]\n" " [-F max-fuzz] [-i patchfile] [-o out-file] [-p strip-count]\n" " [-r rej-name] [-V t | nil | never | none] [-x number]\n" " [-z backup-ext] [--posix] [origfile [patchfile]]\n" " patch <patchfile\n"); my_exit(2); } /* * Attempt to find the right place to apply this hunk of patch. */ static LINENUM locate_hunk(LINENUM fuzz) { LINENUM first_guess = pch_first() + last_offset; LINENUM offset; LINENUM pat_lines = pch_ptrn_lines(); LINENUM max_pos_offset = input_lines - first_guess - pat_lines + 1; LINENUM max_neg_offset = first_guess - last_frozen_line - 1 + pch_context(); if (pat_lines == 0) { /* null range matches always */ if (verbose && fuzz == 0 && (diff_type == CONTEXT_DIFF || diff_type == NEW_CONTEXT_DIFF || diff_type == UNI_DIFF)) { say("Empty context always matches.\n"); } if (first_guess == 0) return 1; return (first_guess); } if (max_neg_offset >= first_guess) /* do not try lines < 0 */ max_neg_offset = first_guess - 1; if (first_guess <= input_lines && patch_match(first_guess, 0, fuzz)) return first_guess; for (offset = 1; ; offset++) { bool check_after = (offset <= max_pos_offset); bool check_before = (offset <= max_neg_offset); if (check_after && patch_match(first_guess, offset, fuzz)) { #ifdef DEBUGGING if (debug & 1) say("Offset changing from %ld to %ld\n", last_offset, offset); #endif last_offset = offset; return first_guess + offset; } else if (check_before && patch_match(first_guess, -offset, fuzz)) { #ifdef DEBUGGING if (debug & 1) say("Offset changing from %ld to %ld\n", last_offset, -offset); #endif last_offset = -offset; return first_guess - offset; } else if (!check_before && !check_after) return 0; } } /* We did not find the pattern, dump out the hunk so they can handle it. */ static void abort_context_hunk(void) { LINENUM i; const LINENUM pat_end = pch_end(); /* * add in last_offset to guess the same as the previous successful * hunk */ const LINENUM oldfirst = pch_first() + last_offset; const LINENUM newfirst = pch_newfirst() + last_offset; const LINENUM oldlast = oldfirst + pch_ptrn_lines() - 1; const LINENUM newlast = newfirst + pch_repl_lines() - 1; const char *stars = (diff_type >= NEW_CONTEXT_DIFF ? " ****" : ""); const char *minuses = (diff_type >= NEW_CONTEXT_DIFF ? " ----" : " -----"); fprintf(rejfp, "***************\n"); for (i = 0; i <= pat_end; i++) { switch (pch_char(i)) { case '*': if (oldlast < oldfirst) fprintf(rejfp, "*** 0%s\n", stars); else if (oldlast == oldfirst) fprintf(rejfp, "*** %ld%s\n", oldfirst, stars); else fprintf(rejfp, "*** %ld,%ld%s\n", oldfirst, oldlast, stars); break; case '=': if (newlast < newfirst) fprintf(rejfp, "--- 0%s\n", minuses); else if (newlast == newfirst) fprintf(rejfp, "--- %ld%s\n", newfirst, minuses); else fprintf(rejfp, "--- %ld,%ld%s\n", newfirst, newlast, minuses); break; case '\n': fprintf(rejfp, "%s", pfetch(i)); break; case ' ': case '-': case '+': case '!': fprintf(rejfp, "%c %s", pch_char(i), pfetch(i)); break; default: fatal("fatal internal error in abort_context_hunk\n"); } } } static void rej_line(int ch, LINENUM i) { size_t len; const char *line = pfetch(i); len = strlen(line); fprintf(rejfp, "%c%s", ch, line); if (len == 0 || line[len-1] != '\n') fprintf(rejfp, "\n\\ No newline at end of file\n"); } static void abort_hunk(void) { LINENUM i, j, split; int ch1, ch2; const LINENUM pat_end = pch_end(); const LINENUM oldfirst = pch_first() + last_offset; const LINENUM newfirst = pch_newfirst() + last_offset; if (diff_type != UNI_DIFF) { abort_context_hunk(); return; } split = -1; for (i = 0; i <= pat_end; i++) { if (pch_char(i) == '=') { split = i; break; } } if (split == -1) { fprintf(rejfp, "malformed hunk: no split found\n"); return; } i = 0; j = split + 1; fprintf(rejfp, "@@ -%ld,%ld +%ld,%ld @@\n", pch_ptrn_lines() ? oldfirst : 0, pch_ptrn_lines(), newfirst, pch_repl_lines()); while (i < split || j <= pat_end) { ch1 = i < split ? pch_char(i) : -1; ch2 = j <= pat_end ? pch_char(j) : -1; if (ch1 == '-') { rej_line('-', i); i++; } else if (ch1 == ' ' && ch2 == ' ') { rej_line(' ', i); i++; j++; } else if (ch1 == '!' && ch2 == '!') { while (i < split && ch1 == '!') { rej_line('-', i); i++; ch1 = i < split ? pch_char(i) : -1; } while (j <= pat_end && ch2 == '!') { rej_line('+', j); j++; ch2 = j <= pat_end ? pch_char(j) : -1; } } else if (ch1 == '*') { i++; } else if (ch2 == '+' || ch2 == ' ') { rej_line(ch2, j); j++; } else { fprintf(rejfp, "internal error on (%ld %ld %ld)\n", i, split, j); rej_line(ch1, i); rej_line(ch2, j); return; } } } /* We found where to apply it (we hope), so do it. */ static void apply_hunk(LINENUM where) { LINENUM old = 1; const LINENUM lastline = pch_ptrn_lines(); LINENUM new = lastline + 1; #define OUTSIDE 0 #define IN_IFNDEF 1 #define IN_IFDEF 2 #define IN_ELSE 3 int def_state = OUTSIDE; const LINENUM pat_end = pch_end(); where--; while (pch_char(new) == '=' || pch_char(new) == '\n') new++; while (old <= lastline) { if (pch_char(old) == '-') { copy_till(where + old - 1, false); if (do_defines) { if (def_state == OUTSIDE) { fputs(not_defined, ofp); def_state = IN_IFNDEF; } else if (def_state == IN_IFDEF) { fputs(else_defined, ofp); def_state = IN_ELSE; } fputs(pfetch(old), ofp); } last_frozen_line++; old++; } else if (new > pat_end) { break; } else if (pch_char(new) == '+') { copy_till(where + old - 1, false); if (do_defines) { if (def_state == IN_IFNDEF) { fputs(else_defined, ofp); def_state = IN_ELSE; } else if (def_state == OUTSIDE) { fputs(if_defined, ofp); def_state = IN_IFDEF; } } fputs(pfetch(new), ofp); new++; } else if (pch_char(new) != pch_char(old)) { say("Out-of-sync patch, lines %ld,%ld--mangled text or line numbers, maybe?\n", pch_hunk_beg() + old, pch_hunk_beg() + new); #ifdef DEBUGGING say("oldchar = '%c', newchar = '%c'\n", pch_char(old), pch_char(new)); #endif my_exit(2); } else if (pch_char(new) == '!') { copy_till(where + old - 1, false); if (do_defines) { fputs(not_defined, ofp); def_state = IN_IFNDEF; } while (pch_char(old) == '!') { if (do_defines) { fputs(pfetch(old), ofp); } last_frozen_line++; old++; } if (do_defines) { fputs(else_defined, ofp); def_state = IN_ELSE; } while (pch_char(new) == '!') { fputs(pfetch(new), ofp); new++; } } else { if (pch_char(new) != ' ') fatal("Internal error: expected ' '\n"); old++; new++; if (do_defines && def_state != OUTSIDE) { fputs(end_defined, ofp); def_state = OUTSIDE; } } } if (new <= pat_end && pch_char(new) == '+') { copy_till(where + old - 1, false); if (do_defines) { if (def_state == OUTSIDE) { fputs(if_defined, ofp); def_state = IN_IFDEF; } else if (def_state == IN_IFNDEF) { fputs(else_defined, ofp); def_state = IN_ELSE; } } while (new <= pat_end && pch_char(new) == '+') { fputs(pfetch(new), ofp); new++; } } if (do_defines && def_state != OUTSIDE) { fputs(end_defined, ofp); } } /* * Open the new file. */ static void init_output(const char *name) { ofp = fopen(name, "w"); if (ofp == NULL) pfatal("can't create %s", name); } /* * Open a file to put hunks we can't locate. */ static void init_reject(const char *name) { rejfp = fopen(name, "w"); if (rejfp == NULL) pfatal("can't create %s", name); } /* * Copy input file to output, up to wherever hunk is to be applied. * If endoffile is true, treat the last line specially since it may * lack a newline. */ static void copy_till(LINENUM lastline, bool endoffile) { if (last_frozen_line > lastline) fatal("misordered hunks! output would be garbled\n"); while (last_frozen_line < lastline) { if (++last_frozen_line == lastline && endoffile) dump_line(last_frozen_line, !last_line_missing_eol); else dump_line(last_frozen_line, true); } } /* * Finish copying the input file to the output file. */ static void spew_output(void) { #ifdef DEBUGGING if (debug & 256) say("il=%ld lfl=%ld\n", input_lines, last_frozen_line); #endif if (input_lines) copy_till(input_lines, true); /* dump remainder of file */ fclose(ofp); ofp = NULL; } /* * Copy one line from input to output. */ static void dump_line(LINENUM line, bool write_newline) { char *s; s = ifetch(line, 0); if (s == NULL) return; /* Note: string is not NUL terminated. */ for (; *s != '\n'; s++) putc(*s, ofp); if (write_newline) putc('\n', ofp); } /* * Does the patch pattern match at line base+offset? */ static bool patch_match(LINENUM base, LINENUM offset, LINENUM fuzz) { LINENUM pline = 1 + fuzz; LINENUM iline; LINENUM pat_lines = pch_ptrn_lines() - fuzz; const char *ilineptr; const char *plineptr; ssize_t plinelen; for (iline = base + offset + fuzz; pline <= pat_lines; pline++, iline++) { ilineptr = ifetch(iline, offset >= 0); if (ilineptr == NULL) return false; plineptr = pfetch(pline); plinelen = pch_line_len(pline); if (canonicalize) { if (!similar(ilineptr, plineptr, plinelen)) return false; } else if (strnNE(ilineptr, plineptr, plinelen)) return false; if (iline == input_lines) { /* * We are looking at the last line of the file. * If the file has no eol, the patch line should * not have one either and vice-versa. Note that * plinelen > 0. */ if (last_line_missing_eol) { if (plineptr[plinelen - 1] == '\n') return false; } else { if (plineptr[plinelen - 1] != '\n') return false; } } } return true; } /* * Do two lines match with canonicalized white space? */ static bool similar(const char *a, const char *b, ssize_t len) { while (len) { if (isspace((unsigned char)*b)) { /* whitespace (or \n) to match? */ if (!isspace((unsigned char)*a)) return false; /* no corresponding whitespace */ while (len && isspace((unsigned char)*b) && *b != '\n') b++, len--; /* skip pattern whitespace */ while (isspace((unsigned char)*a) && *a != '\n') a++; /* skip target whitespace */ if (*a == '\n' || *b == '\n') return (*a == *b); /* should end in sync */ } else if (*a++ != *b++) /* match non-whitespace chars */ return false; else len--; /* probably not necessary */ } return true; /* actually, this is not reached */ /* since there is always a \n */ }