s = Argv[0];	if (strEQ(s, "+")) {	    return;			/* + will be skipped by for loop */	}	if (*s != '-' || !s[1]) {	    if (filec == MAXFILEC)		fatal1("too many file arguments\n");	    filearg[filec++] = savestr(s);	}	else {	    switch (*++s) {	    case 'b':		simple_backup_suffix = savestr(nextarg());		break;	    case 'B':		origprae = savestr(nextarg());		break;	    case 'c':		diff_type = CONTEXT_DIFF;		break;	    case 'd':		if (!*++s)		    s = nextarg();		if (chdir(s) < 0)		    pfatal2("can't cd to %s", s);		break;	    case 'D':	    	do_defines = TRUE;		if (!*++s)		    s = nextarg();		if (!isalpha(*s) && '_' != *s)		    fatal1("argument to -D is not an identifier\n");		Sprintf(if_defined, "#ifdef %s\n", s);		Sprintf(not_defined, "#ifndef %s\n", s);		Sprintf(end_defined, "#endif /* %s */\n", s);		break;	    case 'e':		diff_type = ED_DIFF;		break;	    case 'E':		remove_empty_files = TRUE;		break;	    case 'f':		force = TRUE;		break;	    case 'F':		if (*++s == '=')		    s++;		maxfuzz = atoi(s);		break;	    case 'l':		canonicalize = TRUE;		break;	    case 'n':		diff_type = NORMAL_DIFF;		break;	    case 'N':		noreverse = TRUE;		break;	    case 'o':		outname = savestr(nextarg());		break;	    case 'p':		if (*++s == '=')		    s++;		strippath = atoi(s);		break;	    case 'r':		Strcpy(rejname, nextarg());		break;	    case 'R':		reverse = TRUE;		reverse_flag_specified = TRUE;		break;	    case 's':		verbose = FALSE;		break;	    case 'S':		skip_rest_of_patch = TRUE;		break;	    case 't':		batch = TRUE;		break;	    case 'u':		diff_type = UNI_DIFF;		break;	    case 'v':		version();		break;	    case 'V':#ifndef NODIR		backup_type = get_version (nextarg ());#endif		break;#ifdef DEBUGGING	    case 'x':		debug = atoi(s+1);		break;#endif	    default:		fprintf(stderr, "patch: unrecognized option `%s'\n", Argv[0]);		fprintf(stderr, "\Usage: patch [options] [origfile [patchfile]] [+ [options] [origfile]]...\n\Options:\n\       [-ceEflnNRsStuv] [-b backup-ext] [-B backup-prefix] [-d directory]\n\       [-D symbol] [-Fmax-fuzz] [-o out-file] [-p[strip-count]]\n\       [-r rej-name] [-V {numbered,existing,simple}]\n");		my_exit(1);	    }	}    }}/* Attempt to find the right place to apply this hunk of patch. */LINENUMlocate_hunk(fuzz)LINENUM fuzz;{    Reg1 LINENUM first_guess = pch_first() + last_offset;    Reg2 LINENUM offset;    LINENUM pat_lines = pch_ptrn_lines();    Reg3 LINENUM max_pos_offset = input_lines - first_guess				- pat_lines + 1;     Reg4 LINENUM max_neg_offset = first_guess - last_frozen_line - 1				+ pch_context();    if (!pat_lines)			/* null range matches always */	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, Nulline, fuzz))	return first_guess;    for (offset = 1; ; offset++) {	Reg5 bool check_after = (offset <= max_pos_offset);	Reg6 bool check_before = (offset <= max_neg_offset);	if (check_after && patch_match(first_guess, offset, fuzz)) {#ifdef DEBUGGING	    if (debug & 1)		say3("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)		say3("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 Nulline;    }}/* We did not find the pattern, dump out the hunk so they can handle it. */voidabort_hunk(){    Reg1 LINENUM i;    Reg2 LINENUM pat_end = pch_end();    /* add in last_offset to guess the same as the previous successful hunk */    LINENUM oldfirst = pch_first() + last_offset;    LINENUM newfirst = pch_newfirst() + last_offset;    LINENUM oldlast = oldfirst + pch_ptrn_lines() - 1;    LINENUM newlast = newfirst + pch_repl_lines() - 1;    char *stars = (diff_type >= NEW_CONTEXT_DIFF ? " ****" : "");    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:	    fatal1("fatal internal error in abort_hunk\n"); 	}    }}/* We found where to apply it (we hope), so do it. */voidapply_hunk(where)LINENUM where;{    Reg1 LINENUM old = 1;    Reg2 LINENUM lastline = pch_ptrn_lines();    Reg3 LINENUM new = lastline+1;#define OUTSIDE 0#define IN_IFNDEF 1#define IN_IFDEF 2#define IN_ELSE 3    Reg4 int def_state = OUTSIDE;    Reg5 bool R_do_defines = do_defines;    Reg6 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);	    if (R_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);	    if (R_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)) {	    say3("Out-of-sync patch, lines %ld,%ld--mangled text or line numbers, maybe?\n",		pch_hunk_beg() + old,		pch_hunk_beg() + new);#ifdef DEBUGGING	    say3("oldchar = '%c', newchar = '%c'\n",		pch_char(old), pch_char(new));#endif	    my_exit(1);	}	else if (pch_char(new) == '!') {	    copy_till(where + old - 1);	    if (R_do_defines) {	       fputs(not_defined, ofp);	       def_state = IN_IFNDEF;	    }	    while (pch_char(old) == '!') {		if (R_do_defines) {		    fputs(pfetch(old), ofp);		}		last_frozen_line++;		old++;	    }	    if (R_do_defines) {		fputs(else_defined, ofp);		def_state = IN_ELSE;	    }	    while (pch_char(new) == '!') {		fputs(pfetch(new), ofp);		new++;	    }	}	else {	    assert(pch_char(new) == ' ');	    old++;	    new++;	    if (R_do_defines && def_state != OUTSIDE) {		fputs(end_defined, ofp);		def_state = OUTSIDE;	    }	}    }    if (new <= pat_end && pch_char(new) == '+') {	copy_till(where + old - 1);	if (R_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 (R_do_defines && def_state != OUTSIDE) {	fputs(end_defined, ofp);    }}/* Open the new file. */voidinit_output(name)char *name;{    ofp = fopen(name, "w");    if (ofp == Nullfp)	pfatal2("can't create %s", name);}/* Open a file to put hunks we can't locate. */voidinit_reject(name)char *name;{    rejfp = fopen(name, "w");    if (rejfp == Nullfp)	pfatal2("can't create %s", name);}/* Copy input file to output, up to wherever hunk is to be applied. */voidcopy_till(lastline)Reg1 LINENUM lastline;{    Reg2 LINENUM R_last_frozen_line = last_frozen_line;    if (R_last_frozen_line > lastline)	fatal1("misordered hunks! output would be garbled\n");    while (R_last_frozen_line < lastline) {	dump_line(++R_last_frozen_line);    }    last_frozen_line = R_last_frozen_line;}/* Finish copying the input file to the output file. */voidspew_output(){#ifdef DEBUGGING    if (debug & 256)	say3("il=%ld lfl=%ld\n",input_lines,last_frozen_line);#endif    if (input_lines)	copy_till(input_lines);		/* dump remainder of file */    Fclose(ofp);    ofp = Nullfp;}/* Copy one line from input to output. */voiddump_line(line)LINENUM line;{    Reg1 char *s;    Reg2 char R_newline = '\n';    /* Note: string is not null terminated. */    for (s=ifetch(line, 0); putc(*s, ofp) != R_newline; s++) ;}/* Does the patch pattern match at line base+offset? */boolpatch_match(base, offset, fuzz)LINENUM base;LINENUM offset;LINENUM fuzz;{    Reg1 LINENUM pline = 1 + fuzz;    Reg2 LINENUM iline;    Reg3 LINENUM pat_lines = pch_ptrn_lines() - fuzz;    for (iline=base+offset+fuzz; pline <= pat_lines; pline++,iline++) {	if (canonicalize) {	    if (!similar(ifetch(iline, (offset >= 0)),			 pfetch(pline),			 pch_line_len(pline) ))		return FALSE;	}	else if (strnNE(ifetch(iline, (offset >= 0)),		   pfetch(pline),		   pch_line_len(pline) ))	    return FALSE;    }    return TRUE;}/* Do two lines match with canonicalized white space? */boolsimilar(a,b,len)Reg1 char *a;Reg2 char *b;Reg3 int len;{    while (len) {	if (isspace(*b)) {		/* whitespace (or \n) to match? */	    if (!isspace(*a))		/* no corresponding whitespace? */		return FALSE;	    while (len && isspace(*b) && *b != '\n')		b++,len--;		/* skip pattern whitespace */	    while (isspace(*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 */}/* Exit with cleanup. */voidmy_exit(status)int status;{    Unlink(TMPINNAME);    if (!toutkeep) {	Unlink(TMPOUTNAME);    }    if (!trejkeep) {	Unlink(TMPREJNAME);    }    Unlink(TMPPATNAME);    exit(status);}