[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit

Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/app/busybox/src/editors/sed.c b/ap/app/busybox/src/editors/sed.c
new file mode 100644
index 0000000..f8ca5d3
--- /dev/null
+++ b/ap/app/busybox/src/editors/sed.c
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+/* vi: set sw=4 ts=4: */
+/*
+ * sed.c - very minimalist version of sed
+ *
+ * Copyright (C) 1999,2000,2001 by Lineo, inc. and Mark Whitley
+ * Copyright (C) 1999,2000,2001 by Mark Whitley <markw@codepoet.org>
+ * Copyright (C) 2002  Matt Kraai
+ * Copyright (C) 2003 by Glenn McGrath
+ * Copyright (C) 2003,2004 by Rob Landley <rob@landley.net>
+ *
+ * MAINTAINER: Rob Landley <rob@landley.net>
+ *
+ * Licensed under GPLv2, see file LICENSE in this source tree.
+ */
+
+/* Code overview.
+ *
+ * Files are laid out to avoid unnecessary function declarations.  So for
+ * example, every function add_cmd calls occurs before add_cmd in this file.
+ *
+ * add_cmd() is called on each line of sed command text (from a file or from
+ * the command line).  It calls get_address() and parse_cmd_args().  The
+ * resulting sed_cmd_t structures are appended to a linked list
+ * (G.sed_cmd_head/G.sed_cmd_tail).
+ *
+ * add_input_file() adds a FILE* to the list of input files.  We need to
+ * know all input sources ahead of time to find the last line for the $ match.
+ *
+ * process_files() does actual sedding, reading data lines from each input FILE*
+ * (which could be stdin) and applying the sed command list (sed_cmd_head) to
+ * each of the resulting lines.
+ *
+ * sed_main() is where external code calls into this, with a command line.
+ */
+
+/* Supported features and commands in this version of sed:
+ *
+ * - comments ('#')
+ * - address matching: num|/matchstr/[,num|/matchstr/|$]command
+ * - commands: (p)rint, (d)elete, (s)ubstitue (with g & I flags)
+ * - edit commands: (a)ppend, (i)nsert, (c)hange
+ * - file commands: (r)ead
+ * - backreferences in substitution expressions (\0, \1, \2...\9)
+ * - grouped commands: {cmd1;cmd2}
+ * - transliteration (y/source-chars/dest-chars/)
+ * - pattern space hold space storing / swapping (g, h, x)
+ * - labels / branching (: label, b, t, T)
+ *
+ * (Note: Specifying an address (range) to match is *optional*; commands
+ * default to the whole pattern space if no specific address match was
+ * requested.)
+ *
+ * Todo:
+ * - Create a wrapper around regex to make libc's regex conform with sed
+ *
+ * Reference
+ * http://www.opengroup.org/onlinepubs/007904975/utilities/sed.html
+ * http://pubs.opengroup.org/onlinepubs/9699919799/utilities/sed.html
+ */
+
+//usage:#define sed_trivial_usage
+//usage:       "[-inr] [-f FILE]... [-e CMD]... [FILE]...\n"
+//usage:       "or: sed [-inr] CMD [FILE]..."
+//usage:#define sed_full_usage "\n\n"
+//usage:       "	-e CMD	Add CMD to sed commands to be executed"
+//usage:     "\n	-f FILE	Add FILE contents to sed commands to be executed"
+//usage:     "\n	-i[SFX]	Edit files in-place (otherwise sends to stdout)"
+//usage:     "\n		Optionally back files up, appending SFX"
+//usage:     "\n	-n	Suppress automatic printing of pattern space"
+//usage:     "\n	-r	Use extended regex syntax"
+//usage:     "\n"
+//usage:     "\nIf no -e or -f, the first non-option argument is the sed command string."
+//usage:     "\nRemaining arguments are input files (stdin if none)."
+//usage:
+//usage:#define sed_example_usage
+//usage:       "$ echo \"foo\" | sed -e 's/f[a-zA-Z]o/bar/g'\n"
+//usage:       "bar\n"
+
+#include "libbb.h"
+#include "xregex.h"
+
+#if 0
+# define dbg(...) bb_error_msg(__VA_ARGS__)
+#else
+# define dbg(...) ((void)0)
+#endif
+
+
+enum {
+	OPT_in_place = 1 << 0,
+};
+
+/* Each sed command turns into one of these structures. */
+typedef struct sed_cmd_s {
+	/* Ordered by alignment requirements: currently 36 bytes on x86 */
+	struct sed_cmd_s *next; /* Next command (linked list, NULL terminated) */
+
+	/* address storage */
+	regex_t *beg_match;     /* sed -e '/match/cmd' */
+	regex_t *end_match;     /* sed -e '/match/,/end_match/cmd' */
+	regex_t *sub_match;     /* For 's/sub_match/string/' */
+	int beg_line;           /* 'sed 1p'   0 == apply commands to all lines */
+	int beg_line_orig;      /* copy of the above, needed for -i */
+	int end_line;           /* 'sed 1,3p' 0 == one line only. -1 = last line ($) */
+
+	FILE *sw_file;          /* File (sw) command writes to, -1 for none. */
+	char *string;           /* Data string for (saicytb) commands. */
+
+	unsigned which_match;   /* (s) Which match to replace (0 for all) */
+
+	/* Bitfields (gcc won't group them if we don't) */
+	unsigned invert:1;      /* the '!' after the address */
+	unsigned in_match:1;    /* Next line also included in match? */
+	unsigned sub_p:1;       /* (s) print option */
+
+	char sw_last_char;      /* Last line written by (sw) had no '\n' */
+
+	/* GENERAL FIELDS */
+	char cmd;               /* The command char: abcdDgGhHilnNpPqrstwxy:={} */
+} sed_cmd_t;
+
+static const char semicolon_whitespace[] ALIGN1 = "; \n\r\t\v";
+
+struct globals {
+	/* options */
+	int be_quiet, regex_type;
+	FILE *nonstdout;
+	char *outname, *hold_space;
+
+	/* List of input files */
+	int input_file_count, current_input_file;
+	FILE **input_file_list;
+
+	regmatch_t regmatch[10];
+	regex_t *previous_regex_ptr;
+
+	/* linked list of sed commands */
+	sed_cmd_t *sed_cmd_head, **sed_cmd_tail;
+
+	/* Linked list of append lines */
+	llist_t *append_head;
+
+	char *add_cmd_line;
+
+	struct pipeline {
+		char *buf;  /* Space to hold string */
+		int idx;    /* Space used */
+		int len;    /* Space allocated */
+	} pipeline;
+} FIX_ALIASING;
+#define G (*(struct globals*)&bb_common_bufsiz1)
+struct BUG_G_too_big {
+	char BUG_G_too_big[sizeof(G) <= COMMON_BUFSIZE ? 1 : -1];
+};
+#define INIT_G() do { \
+	G.sed_cmd_tail = &G.sed_cmd_head; \
+} while (0)
+
+
+#if ENABLE_FEATURE_CLEAN_UP
+static void sed_free_and_close_stuff(void)
+{
+	sed_cmd_t *sed_cmd = G.sed_cmd_head;
+
+	llist_free(G.append_head, free);
+
+	while (sed_cmd) {
+		sed_cmd_t *sed_cmd_next = sed_cmd->next;
+
+		if (sed_cmd->sw_file)
+			xprint_and_close_file(sed_cmd->sw_file);
+
+		if (sed_cmd->beg_match) {
+			regfree(sed_cmd->beg_match);
+			free(sed_cmd->beg_match);
+		}
+		if (sed_cmd->end_match) {
+			regfree(sed_cmd->end_match);
+			free(sed_cmd->end_match);
+		}
+		if (sed_cmd->sub_match) {
+			regfree(sed_cmd->sub_match);
+			free(sed_cmd->sub_match);
+		}
+		free(sed_cmd->string);
+		free(sed_cmd);
+		sed_cmd = sed_cmd_next;
+	}
+
+	free(G.hold_space);
+
+	while (G.current_input_file < G.input_file_count)
+		fclose(G.input_file_list[G.current_input_file++]);
+}
+#else
+void sed_free_and_close_stuff(void);
+#endif
+
+/* If something bad happens during -i operation, delete temp file */
+
+static void cleanup_outname(void)
+{
+	if (G.outname) unlink(G.outname);
+}
+
+/* strcpy, replacing "\from" with 'to'. If to is NUL, replacing "\any" with 'any' */
+
+static void parse_escapes(char *dest, const char *string, int len, char from, char to)
+{
+	int i = 0;
+
+	while (i < len) {
+		if (string[i] == '\\') {
+			if (!to || string[i+1] == from) {
+				*dest++ = to ? to : string[i+1];
+				i += 2;
+				continue;
+			}
+			*dest++ = string[i++];
+		}
+		/* TODO: is it safe wrt a string with trailing '\\' ? */
+		*dest++ = string[i++];
+	}
+	*dest = '\0';
+}
+
+static char *copy_parsing_escapes(const char *string, int len)
+{
+	const char *s;
+	char *dest = xmalloc(len + 1);
+
+	/* sed recognizes \n */
+	/* GNU sed also recognizes \t and \r */
+	for (s = "\nn\tt\rr"; *s; s += 2) {
+		parse_escapes(dest, string, len, s[1], s[0]);
+		string = dest;
+		len = strlen(dest);
+	}
+	return dest;
+}
+
+
+/*
+ * index_of_next_unescaped_regexp_delim - walks left to right through a string
+ * beginning at a specified index and returns the index of the next regular
+ * expression delimiter (typically a forward slash ('/')) not preceded by
+ * a backslash ('\').  A negative delimiter disables square bracket checking.
+ */
+static int index_of_next_unescaped_regexp_delim(int delimiter, const char *str)
+{
+	int bracket = -1;
+	int escaped = 0;
+	int idx = 0;
+	char ch;
+
+	if (delimiter < 0) {
+		bracket--;
+		delimiter = -delimiter;
+	}
+
+	for (; (ch = str[idx]) != '\0'; idx++) {
+		if (bracket >= 0) {
+			if (ch == ']'
+			 && !(bracket == idx - 1 || (bracket == idx - 2 && str[idx - 1] == '^'))
+			) {
+				bracket = -1;
+			}
+		} else if (escaped)
+			escaped = 0;
+		else if (ch == '\\')
+			escaped = 1;
+		else if (bracket == -1 && ch == '[')
+			bracket = idx;
+		else if (ch == delimiter)
+			return idx;
+	}
+
+	/* if we make it to here, we've hit the end of the string */
+	bb_error_msg_and_die("unmatched '%c'", delimiter);
+}
+
+/*
+ *  Returns the index of the third delimiter
+ */
+static int parse_regex_delim(const char *cmdstr, char **match, char **replace)
+{
+	const char *cmdstr_ptr = cmdstr;
+	unsigned char delimiter;
+	int idx = 0;
+
+	/* verify that the 's' or 'y' is followed by something.  That something
+	 * (typically a 'slash') is now our regexp delimiter... */
+	if (*cmdstr == '\0')
+		bb_error_msg_and_die("bad format in substitution expression");
+	delimiter = *cmdstr_ptr++;
+
+	/* save the match string */
+	idx = index_of_next_unescaped_regexp_delim(delimiter, cmdstr_ptr);
+	*match = copy_parsing_escapes(cmdstr_ptr, idx);
+
+	/* save the replacement string */
+	cmdstr_ptr += idx + 1;
+	idx = index_of_next_unescaped_regexp_delim(- (int)delimiter, cmdstr_ptr);
+	*replace = copy_parsing_escapes(cmdstr_ptr, idx);
+
+	return ((cmdstr_ptr - cmdstr) + idx);
+}
+
+/*
+ * returns the index in the string just past where the address ends.
+ */
+static int get_address(const char *my_str, int *linenum, regex_t ** regex)
+{
+	const char *pos = my_str;
+
+	if (isdigit(*my_str)) {
+		*linenum = strtol(my_str, (char**)&pos, 10);
+		/* endstr shouldnt ever equal NULL */
+	} else if (*my_str == '$') {
+		*linenum = -1;
+		pos++;
+	} else if (*my_str == '/' || *my_str == '\\') {
+		int next;
+		char delimiter;
+		char *temp;
+
+		delimiter = '/';
+		if (*my_str == '\\')
+			delimiter = *++pos;
+		next = index_of_next_unescaped_regexp_delim(delimiter, ++pos);
+		temp = copy_parsing_escapes(pos, next);
+		*regex = xzalloc(sizeof(regex_t));
+		xregcomp(*regex, temp, G.regex_type|REG_NEWLINE);
+		free(temp);
+		/* Move position to next character after last delimiter */
+		pos += (next+1);
+	}
+	return pos - my_str;
+}
+
+/* Grab a filename.  Whitespace at start is skipped, then goes to EOL. */
+static int parse_file_cmd(/*sed_cmd_t *sed_cmd,*/ const char *filecmdstr, char **retval)
+{
+	int start = 0, idx, hack = 0;
+
+	/* Skip whitespace, then grab filename to end of line */
+	while (isspace(filecmdstr[start]))
+		start++;
+	idx = start;
+	while (filecmdstr[idx] && filecmdstr[idx] != '\n')
+		idx++;
+
+	/* If lines glued together, put backslash back. */
+	if (filecmdstr[idx] == '\n')
+		hack = 1;
+	if (idx == start)
+		bb_error_msg_and_die("empty filename");
+	*retval = xstrndup(filecmdstr+start, idx-start+hack+1);
+	if (hack)
+		(*retval)[idx] = '\\';
+
+	return idx;
+}
+
+static int parse_subst_cmd(sed_cmd_t *sed_cmd, const char *substr)
+{
+	int cflags = G.regex_type;
+	char *match;
+	int idx;
+
+	/*
+	 * A substitution command should look something like this:
+	 *    s/match/replace/ #gIpw
+	 *    ||     |        |||
+	 *    mandatory       optional
+	 */
+	idx = parse_regex_delim(substr, &match, &sed_cmd->string);
+
+	/* determine the number of back references in the match string */
+	/* Note: we compute this here rather than in the do_subst_command()
+	 * function to save processor time, at the expense of a little more memory
+	 * (4 bits) per sed_cmd */
+
+	/* process the flags */
+
+	sed_cmd->which_match = 1;
+	while (substr[++idx]) {
+		/* Parse match number */
+		if (isdigit(substr[idx])) {
+			if (match[0] != '^') {
+				/* Match 0 treated as all, multiple matches we take the last one. */
+				const char *pos = substr + idx;
+/* FIXME: error check? */
+				sed_cmd->which_match = (unsigned)strtol(substr+idx, (char**) &pos, 10);
+				idx = pos - substr;
+			}
+			continue;
+		}
+		/* Skip spaces */
+		if (isspace(substr[idx]))
+			continue;
+
+		switch (substr[idx]) {
+		/* Replace all occurrences */
+		case 'g':
+			if (match[0] != '^')
+				sed_cmd->which_match = 0;
+			break;
+		/* Print pattern space */
+		case 'p':
+			sed_cmd->sub_p = 1;
+			break;
+		/* Write to file */
+		case 'w':
+		{
+			char *temp;
+			idx += parse_file_cmd(/*sed_cmd,*/ substr+idx, &temp);
+			break;
+		}
+		/* Ignore case (gnu exension) */
+		case 'I':
+			cflags |= REG_ICASE;
+			break;
+		/* Comment */
+		case '#':
+			// while (substr[++idx]) continue;
+			idx += strlen(substr + idx); // same
+			/* Fall through */
+		/* End of command */
+		case ';':
+		case '}':
+			goto out;
+		default:
+			bb_error_msg_and_die("bad option in substitution expression");
+		}
+	}
+ out:
+	/* compile the match string into a regex */
+	if (*match != '\0') {
+		/* If match is empty, we use last regex used at runtime */
+		sed_cmd->sub_match = xzalloc(sizeof(regex_t));
+		dbg("xregcomp('%s',%x)", match, cflags);
+		xregcomp(sed_cmd->sub_match, match, cflags);
+		dbg("regcomp ok");
+	}
+	free(match);
+
+	return idx;
+}
+
+/*
+ *  Process the commands arguments
+ */
+static const char *parse_cmd_args(sed_cmd_t *sed_cmd, const char *cmdstr)
+{
+	static const char cmd_letters[] = "saicrw:btTydDgGhHlnNpPqx={}";
+	enum {
+		IDX_s = 0,
+		IDX_a,
+		IDX_i,
+		IDX_c,
+		IDX_r,
+		IDX_w,
+		IDX_colon,
+		IDX_b,
+		IDX_t,
+		IDX_T,
+		IDX_y,
+		IDX_d,
+		IDX_D,
+		IDX_g,
+		IDX_G,
+		IDX_h,
+		IDX_H,
+		IDX_l,
+		IDX_n,
+		IDX_N,
+		IDX_p,
+		IDX_P,
+		IDX_q,
+		IDX_x,
+		IDX_equal,
+		IDX_lbrace,
+		IDX_rbrace,
+		IDX_nul
+	};
+	struct chk { char chk[sizeof(cmd_letters)-1 == IDX_nul ? 1 : -1]; };
+
+	unsigned idx = strchrnul(cmd_letters, sed_cmd->cmd) - cmd_letters;
+
+	/* handle (s)ubstitution command */
+	if (idx == IDX_s) {
+		cmdstr += parse_subst_cmd(sed_cmd, cmdstr);
+	}
+	/* handle edit cmds: (a)ppend, (i)nsert, and (c)hange */
+	else if (idx <= IDX_c) { /* a,i,c */
+		if (idx < IDX_c) { /* a,i */
+			if (sed_cmd->end_line || sed_cmd->end_match)
+				bb_error_msg_and_die("command '%c' uses only one address", sed_cmd->cmd);
+		}
+		for (;;) {
+			if (*cmdstr == '\n' || *cmdstr == '\\') {
+				cmdstr++;
+				break;
+			}
+			if (!isspace(*cmdstr))
+				break;
+			cmdstr++;
+		}
+		sed_cmd->string = xstrdup(cmdstr);
+		/* "\anychar" -> "anychar" */
+		parse_escapes(sed_cmd->string, sed_cmd->string, strlen(cmdstr), '\0', '\0');
+		cmdstr += strlen(cmdstr);
+	}
+	/* handle file cmds: (r)ead */
+	else if (idx <= IDX_w) { /* r,w */
+		if (idx < IDX_w) { /* r */
+			if (sed_cmd->end_line || sed_cmd->end_match)
+				bb_error_msg_and_die("command '%c' uses only one address", sed_cmd->cmd);
+		}
+		cmdstr += parse_file_cmd(/*sed_cmd,*/ cmdstr, &sed_cmd->string);
+		if (sed_cmd->cmd == 'w') {
+			sed_cmd->sw_file = xfopen_for_write(sed_cmd->string);
+			sed_cmd->sw_last_char = '\n';
+		}
+	}
+	/* handle branch commands */
+	else if (idx <= IDX_T) { /* :,b,t,T */
+		int length;
+
+		cmdstr = skip_whitespace(cmdstr);
+		length = strcspn(cmdstr, semicolon_whitespace);
+		if (length) {
+			sed_cmd->string = xstrndup(cmdstr, length);
+			cmdstr += length;
+		}
+	}
+	/* translation command */
+	else if (idx == IDX_y) {
+		char *match, *replace;
+		int i = cmdstr[0];
+
+		cmdstr += parse_regex_delim(cmdstr, &match, &replace)+1;
+		/* \n already parsed, but \delimiter needs unescaping. */
+		parse_escapes(match, match, strlen(match), i, i);
+		parse_escapes(replace, replace, strlen(replace), i, i);
+
+		sed_cmd->string = xzalloc((strlen(match) + 1) * 2);
+		for (i = 0; match[i] && replace[i]; i++) {
+			sed_cmd->string[i*2] = match[i];
+			sed_cmd->string[i*2+1] = replace[i];
+		}
+		free(match);
+		free(replace);
+	}
+	/* if it wasnt a single-letter command that takes no arguments
+	 * then it must be an invalid command.
+	 */
+	else if (idx >= IDX_nul) { /* not d,D,g,G,h,H,l,n,N,p,P,q,x,=,{,} */
+		bb_error_msg_and_die("unsupported command %c", sed_cmd->cmd);
+	}
+
+	/* give back whatever's left over */
+	return cmdstr;
+}
+
+
+/* Parse address+command sets, skipping comment lines. */
+
+static void add_cmd(const char *cmdstr)
+{
+	sed_cmd_t *sed_cmd;
+	unsigned len, n;
+
+	/* Append this line to any unfinished line from last time. */
+	if (G.add_cmd_line) {
+		char *tp = xasprintf("%s\n%s", G.add_cmd_line, cmdstr);
+		free(G.add_cmd_line);
+		cmdstr = G.add_cmd_line = tp;
+	}
+
+	/* If this line ends with unescaped backslash, request next line. */
+	n = len = strlen(cmdstr);
+	while (n && cmdstr[n-1] == '\\')
+		n--;
+	if ((len - n) & 1) { /* if odd number of trailing backslashes */
+		if (!G.add_cmd_line)
+			G.add_cmd_line = xstrdup(cmdstr);
+		G.add_cmd_line[len-1] = '\0';
+		return;
+	}
+
+	/* Loop parsing all commands in this line. */
+	while (*cmdstr) {
+		/* Skip leading whitespace and semicolons */
+		cmdstr += strspn(cmdstr, semicolon_whitespace);
+
+		/* If no more commands, exit. */
+		if (!*cmdstr) break;
+
+		/* if this is a comment, jump past it and keep going */
+		if (*cmdstr == '#') {
+			/* "#n" is the same as using -n on the command line */
+			if (cmdstr[1] == 'n')
+				G.be_quiet++;
+			cmdstr = strpbrk(cmdstr, "\n\r");
+			if (!cmdstr) break;
+			continue;
+		}
+
+		/* parse the command
+		 * format is: [addr][,addr][!]cmd
+		 *            |----||-----||-|
+		 *            part1 part2  part3
+		 */
+
+		sed_cmd = xzalloc(sizeof(sed_cmd_t));
+
+		/* first part (if present) is an address: either a '$', a number or a /regex/ */
+		cmdstr += get_address(cmdstr, &sed_cmd->beg_line, &sed_cmd->beg_match);
+		sed_cmd->beg_line_orig = sed_cmd->beg_line;
+
+		/* second part (if present) will begin with a comma */
+		if (*cmdstr == ',') {
+			int idx;
+
+			cmdstr++;
+			idx = get_address(cmdstr, &sed_cmd->end_line, &sed_cmd->end_match);
+			if (!idx)
+				bb_error_msg_and_die("no address after comma");
+			cmdstr += idx;
+		}
+
+		/* skip whitespace before the command */
+		cmdstr = skip_whitespace(cmdstr);
+
+		/* Check for inversion flag */
+		if (*cmdstr == '!') {
+			sed_cmd->invert = 1;
+			cmdstr++;
+
+			/* skip whitespace before the command */
+			cmdstr = skip_whitespace(cmdstr);
+		}
+
+		/* last part (mandatory) will be a command */
+		if (!*cmdstr)
+			bb_error_msg_and_die("missing command");
+		sed_cmd->cmd = *cmdstr++;
+		cmdstr = parse_cmd_args(sed_cmd, cmdstr);
+
+		/* Add the command to the command array */
+		*G.sed_cmd_tail = sed_cmd;
+		G.sed_cmd_tail = &sed_cmd->next;
+	}
+
+	/* If we glued multiple lines together, free the memory. */
+	free(G.add_cmd_line);
+	G.add_cmd_line = NULL;
+}
+
+/* Append to a string, reallocating memory as necessary. */
+
+#define PIPE_GROW 64
+
+static void pipe_putc(char c)
+{
+	if (G.pipeline.idx == G.pipeline.len) {
+		G.pipeline.buf = xrealloc(G.pipeline.buf,
+				G.pipeline.len + PIPE_GROW);
+		G.pipeline.len += PIPE_GROW;
+	}
+	G.pipeline.buf[G.pipeline.idx++] = c;
+}
+
+static void do_subst_w_backrefs(char *line, char *replace)
+{
+	int i, j;
+
+	/* go through the replacement string */
+	for (i = 0; replace[i]; i++) {
+		/* if we find a backreference (\1, \2, etc.) print the backref'ed text */
+		if (replace[i] == '\\') {
+			unsigned backref = replace[++i] - '0';
+			if (backref <= 9) {
+				/* print out the text held in G.regmatch[backref] */
+				if (G.regmatch[backref].rm_so != -1) {
+					j = G.regmatch[backref].rm_so;
+					while (j < G.regmatch[backref].rm_eo)
+						pipe_putc(line[j++]);
+				}
+				continue;
+			}
+			/* I _think_ it is impossible to get '\' to be
+			 * the last char in replace string. Thus we dont check
+			 * for replace[i] == NUL. (counterexample anyone?) */
+			/* if we find a backslash escaped character, print the character */
+			pipe_putc(replace[i]);
+			continue;
+		}
+		/* if we find an unescaped '&' print out the whole matched text. */
+		if (replace[i] == '&') {
+			j = G.regmatch[0].rm_so;
+			while (j < G.regmatch[0].rm_eo)
+				pipe_putc(line[j++]);
+			continue;
+		}
+		/* Otherwise just output the character. */
+		pipe_putc(replace[i]);
+	}
+}
+
+static int do_subst_command(sed_cmd_t *sed_cmd, char **line_p)
+{
+	char *line = *line_p;
+	unsigned match_count = 0;
+	bool altered = 0;
+	bool prev_match_empty = 1;
+	bool tried_at_eol = 0;
+	regex_t *current_regex;
+
+	current_regex = sed_cmd->sub_match;
+	/* Handle empty regex. */
+	if (!current_regex) {
+		current_regex = G.previous_regex_ptr;
+		if (!current_regex)
+			bb_error_msg_and_die("no previous regexp");
+	}
+	G.previous_regex_ptr = current_regex;
+
+	/* Find the first match */
+	dbg("matching '%s'", line);
+	if (REG_NOMATCH == regexec(current_regex, line, 10, G.regmatch, 0)) {
+		dbg("no match");
+		return 0;
+	}
+	dbg("match");
+
+	/* Initialize temporary output buffer. */
+	G.pipeline.buf = xmalloc(PIPE_GROW);
+	G.pipeline.len = PIPE_GROW;
+	G.pipeline.idx = 0;
+
+	/* Now loop through, substituting for matches */
+	do {
+		int start = G.regmatch[0].rm_so;
+		int end = G.regmatch[0].rm_eo;
+		int i;
+
+		match_count++;
+
+		/* If we aren't interested in this match, output old line to
+		 * end of match and continue */
+		if (sed_cmd->which_match
+		 && (sed_cmd->which_match != match_count)
+		) {
+			for (i = 0; i < end; i++)
+				pipe_putc(*line++);
+			/* Null match? Print one more char */
+			if (start == end && *line)
+				pipe_putc(*line++);
+			goto next;
+		}
+
+		/* Print everything before the match */
+		for (i = 0; i < start; i++)
+			pipe_putc(line[i]);
+
+		/* Then print the substitution string,
+		 * unless we just matched empty string after non-empty one.
+		 * Example: string "cccd", pattern "c*", repl "R":
+		 * result is "RdR", not "RRdR": first match "ccc",
+		 * second is "" before "d", third is "" after "d".
+		 * Second match is NOT replaced!
+		 */
+		if (prev_match_empty || start != 0 || start != end) {
+			//dbg("%d %d %d", prev_match_empty, start, end);
+			dbg("inserting replacement at %d in '%s'", start, line);
+			do_subst_w_backrefs(line, sed_cmd->string);
+			/* Flag that something has changed */
+			altered = 1;
+		} else {
+			dbg("NOT inserting replacement at %d in '%s'", start, line);
+		}
+
+		/* If matched string is empty (f.e. "c*" pattern),
+		 * copy verbatim one char after it before attempting more matches
+		 */
+		prev_match_empty = (start == end);
+		if (prev_match_empty) {
+			if (!line[end]) {
+				tried_at_eol = 1;
+			} else {
+				pipe_putc(line[end]);
+				end++;
+			}
+		}
+
+		/* Advance past the match */
+		dbg("line += %d", end);
+		line += end;
+
+		/* if we're not doing this globally, get out now */
+		if (sed_cmd->which_match != 0)
+			break;
+ next:
+		/* Exit if we are at EOL and already tried matching at it */
+		if (*line == '\0') {
+			if (tried_at_eol)
+				break;
+			tried_at_eol = 1;
+		}
+
+//maybe (end ? REG_NOTBOL : 0) instead of unconditional REG_NOTBOL?
+	} while (regexec(current_regex, line, 10, G.regmatch, REG_NOTBOL) != REG_NOMATCH);
+
+	/* Copy rest of string into output pipeline */
+	while (1) {
+		char c = *line++;
+		pipe_putc(c);
+		if (c == '\0')
+			break;
+	}
+
+	free(*line_p);
+	*line_p = G.pipeline.buf;
+	return altered;
+}
+
+/* Set command pointer to point to this label.  (Does not handle null label.) */
+static sed_cmd_t *branch_to(char *label)
+{
+	sed_cmd_t *sed_cmd;
+
+	for (sed_cmd = G.sed_cmd_head; sed_cmd; sed_cmd = sed_cmd->next) {
+		if (sed_cmd->cmd == ':' && sed_cmd->string && !strcmp(sed_cmd->string, label)) {
+			return sed_cmd;
+		}
+	}
+	bb_error_msg_and_die("can't find label for jump to '%s'", label);
+}
+
+static void append(char *s)
+{
+	llist_add_to_end(&G.append_head, xstrdup(s));
+}
+
+static void flush_append(void)
+{
+	char *data;
+
+	/* Output appended lines. */
+	while ((data = (char *)llist_pop(&G.append_head))) {
+		fprintf(G.nonstdout, "%s\n", data);
+		free(data);
+	}
+}
+
+static void add_input_file(FILE *file)
+{
+	G.input_file_list = xrealloc_vector(G.input_file_list, 2, G.input_file_count);
+	G.input_file_list[G.input_file_count++] = file;
+}
+
+/* Get next line of input from G.input_file_list, flushing append buffer and
+ * noting if we ran out of files without a newline on the last line we read.
+ */
+enum {
+	NO_EOL_CHAR = 1,
+	LAST_IS_NUL = 2,
+};
+static char *get_next_line(char *gets_char)
+{
+	char *temp = NULL;
+	int len;
+	char gc;
+
+	flush_append();
+
+	/* will be returned if last line in the file
+	 * doesn't end with either '\n' or '\0' */
+	gc = NO_EOL_CHAR;
+	while (G.current_input_file < G.input_file_count) {
+		FILE *fp = G.input_file_list[G.current_input_file];
+		/* Read line up to a newline or NUL byte, inclusive,
+		 * return malloc'ed char[]. length of the chunk read
+		 * is stored in len. NULL if EOF/error */
+		temp = bb_get_chunk_from_file(fp, &len);
+		if (temp) {
+			/* len > 0 here, it's ok to do temp[len-1] */
+			char c = temp[len-1];
+			if (c == '\n' || c == '\0') {
+				temp[len-1] = '\0';
+				gc = c;
+				if (c == '\0') {
+					int ch = fgetc(fp);
+					if (ch != EOF)
+						ungetc(ch, fp);
+					else
+						gc = LAST_IS_NUL;
+				}
+			}
+			/* else we put NO_EOL_CHAR into *gets_char */
+			break;
+
+		/* NB: I had the idea of peeking next file(s) and returning
+		 * NO_EOL_CHAR only if it is the *last* non-empty
+		 * input file. But there is a case where this won't work:
+		 * file1: "a woo\nb woo"
+		 * file2: "c no\nd no"
+		 * sed -ne 's/woo/bang/p' input1 input2 => "a bang\nb bang"
+		 * (note: *no* newline after "b bang"!) */
+		}
+		/* Close this file and advance to next one */
+		fclose(fp);
+		G.current_input_file++;
+	}
+	*gets_char = gc;
+	return temp;
+}
+
+/* Output line of text. */
+/* Note:
+ * The tricks with NO_EOL_CHAR and last_puts_char are there to emulate gnu sed.
+ * Without them, we had this:
+ * echo -n thingy >z1
+ * echo -n again >z2
+ * >znull
+ * sed "s/i/z/" z1 z2 znull | hexdump -vC
+ * output:
+ * gnu sed 4.1.5:
+ * 00000000  74 68 7a 6e 67 79 0a 61  67 61 7a 6e              |thzngy.agazn|
+ * bbox:
+ * 00000000  74 68 7a 6e 67 79 61 67  61 7a 6e                 |thzngyagazn|
+ */
+static void puts_maybe_newline(char *s, FILE *file, char *last_puts_char, char last_gets_char)
+{
+	char lpc = *last_puts_char;
+
+	/* Need to insert a '\n' between two files because first file's
+	 * last line wasn't terminated? */
+	if (lpc != '\n' && lpc != '\0') {
+		fputc('\n', file);
+		lpc = '\n';
+	}
+	fputs(s, file);
+
+	/* 'x' - just something which is not '\n', '\0' or NO_EOL_CHAR */
+	if (s[0])
+		lpc = 'x';
+
+	/* had trailing '\0' and it was last char of file? */
+	if (last_gets_char == LAST_IS_NUL) {
+		fputc('\0', file);
+		lpc = 'x'; /* */
+	} else
+	/* had trailing '\n' or '\0'? */
+	if (last_gets_char != NO_EOL_CHAR) {
+		fputc(last_gets_char, file);
+		lpc = last_gets_char;
+	}
+
+	if (ferror(file)) {
+		xfunc_error_retval = 4;  /* It's what gnu sed exits with... */
+		bb_error_msg_and_die(bb_msg_write_error);
+	}
+	*last_puts_char = lpc;
+}
+
+#define sed_puts(s, n) (puts_maybe_newline(s, G.nonstdout, &last_puts_char, n))
+
+static int beg_match(sed_cmd_t *sed_cmd, const char *pattern_space)
+{
+	int retval = sed_cmd->beg_match && !regexec(sed_cmd->beg_match, pattern_space, 0, NULL, 0);
+	if (retval)
+		G.previous_regex_ptr = sed_cmd->beg_match;
+	return retval;
+}
+
+/* Process all the lines in all the files */
+
+static void process_files(void)
+{
+	char *pattern_space, *next_line;
+	int linenum = 0;
+	char last_puts_char = '\n';
+	char last_gets_char, next_gets_char;
+	sed_cmd_t *sed_cmd;
+	int substituted;
+
+	/* Prime the pump */
+	next_line = get_next_line(&next_gets_char);
+
+	/* Go through every line in each file */
+ again:
+	substituted = 0;
+
+	/* Advance to next line.  Stop if out of lines. */
+	pattern_space = next_line;
+	if (!pattern_space)
+		return;
+	last_gets_char = next_gets_char;
+
+	/* Read one line in advance so we can act on the last line,
+	 * the '$' address */
+	next_line = get_next_line(&next_gets_char);
+	linenum++;
+
+	/* For every line, go through all the commands */
+ restart:
+	for (sed_cmd = G.sed_cmd_head; sed_cmd; sed_cmd = sed_cmd->next) {
+		int old_matched, matched;
+
+		old_matched = sed_cmd->in_match;
+
+		/* Determine if this command matches this line: */
+
+		dbg("match1:%d", sed_cmd->in_match);
+		dbg("match2:%d", (!sed_cmd->beg_line && !sed_cmd->end_line
+				&& !sed_cmd->beg_match && !sed_cmd->end_match));
+		dbg("match3:%d", (sed_cmd->beg_line > 0
+			&& (sed_cmd->end_line || sed_cmd->end_match
+			    ? (sed_cmd->beg_line <= linenum)
+			    : (sed_cmd->beg_line == linenum)
+			    )
+			));
+		dbg("match4:%d", (beg_match(sed_cmd, pattern_space)));
+		dbg("match5:%d", (sed_cmd->beg_line == -1 && next_line == NULL));
+
+		/* Are we continuing a previous multi-line match? */
+		sed_cmd->in_match = sed_cmd->in_match
+			/* Or is no range necessary? */
+			|| (!sed_cmd->beg_line && !sed_cmd->end_line
+				&& !sed_cmd->beg_match && !sed_cmd->end_match)
+			/* Or did we match the start of a numerical range? */
+			|| (sed_cmd->beg_line > 0
+			    && (sed_cmd->end_line || sed_cmd->end_match
+				  /* note: even if end is numeric and is < linenum too,
+				   * GNU sed matches! We match too, therefore we don't
+				   * check here that linenum <= end.
+				   * Example:
+				   * printf '1\n2\n3\n4\n' | sed -n '1{N;N;d};1p;2,3p;3p;4p'
+				   * first three input lines are deleted;
+				   * 4th line is matched and printed
+				   * by "2,3" (!) and by "4" ranges
+				   */
+				? (sed_cmd->beg_line <= linenum)    /* N,end */
+				: (sed_cmd->beg_line == linenum)    /* N */
+				)
+			    )
+			/* Or does this line match our begin address regex? */
+			|| (beg_match(sed_cmd, pattern_space))
+			/* Or did we match last line of input? */
+			|| (sed_cmd->beg_line == -1 && next_line == NULL);
+
+		/* Snapshot the value */
+		matched = sed_cmd->in_match;
+
+		dbg("cmd:'%c' matched:%d beg_line:%d end_line:%d linenum:%d",
+			sed_cmd->cmd, matched, sed_cmd->beg_line, sed_cmd->end_line, linenum);
+
+		/* Is this line the end of the current match? */
+
+		if (matched) {
+			/* once matched, "n,xxx" range is dead, disabling it */
+			if (sed_cmd->beg_line > 0) {
+				sed_cmd->beg_line = -2;
+			}
+			sed_cmd->in_match = !(
+				/* has the ending line come, or is this a single address command? */
+				(sed_cmd->end_line
+					? sed_cmd->end_line == -1
+						? !next_line
+						: (sed_cmd->end_line <= linenum)
+					: !sed_cmd->end_match
+				)
+				/* or does this line matches our last address regex */
+				|| (sed_cmd->end_match && old_matched
+				     && (regexec(sed_cmd->end_match,
+						pattern_space, 0, NULL, 0) == 0)
+				)
+			);
+		}
+
+		/* Skip blocks of commands we didn't match */
+		if (sed_cmd->cmd == '{') {
+			if (sed_cmd->invert ? matched : !matched) {
+				unsigned nest_cnt = 0;
+				while (1) {
+					if (sed_cmd->cmd == '{')
+						nest_cnt++;
+					if (sed_cmd->cmd == '}') {
+						nest_cnt--;
+						if (nest_cnt == 0)
+							break;
+					}
+					sed_cmd = sed_cmd->next;
+					if (!sed_cmd)
+						bb_error_msg_and_die("unterminated {");
+				}
+			}
+			continue;
+		}
+
+		/* Okay, so did this line match? */
+		if (sed_cmd->invert ? matched : !matched)
+			continue; /* no */
+
+		/* Update last used regex in case a blank substitute BRE is found */
+		if (sed_cmd->beg_match) {
+			G.previous_regex_ptr = sed_cmd->beg_match;
+		}
+
+		/* actual sedding */
+		dbg("pattern_space:'%s' next_line:'%s' cmd:%c",
+				pattern_space, next_line, sed_cmd->cmd);
+		switch (sed_cmd->cmd) {
+
+		/* Print line number */
+		case '=':
+			fprintf(G.nonstdout, "%d\n", linenum);
+			break;
+
+		/* Write the current pattern space up to the first newline */
+		case 'P':
+		{
+			char *tmp = strchr(pattern_space, '\n');
+			if (tmp) {
+				*tmp = '\0';
+				/* TODO: explain why '\n' below */
+				sed_puts(pattern_space, '\n');
+				*tmp = '\n';
+				break;
+			}
+			/* Fall Through */
+		}
+
+		/* Write the current pattern space to output */
+		case 'p':
+			/* NB: we print this _before_ the last line
+			 * (of current file) is printed. Even if
+			 * that line is nonterminated, we print
+			 * '\n' here (gnu sed does the same) */
+			sed_puts(pattern_space, '\n');
+			break;
+		/* Delete up through first newline */
+		case 'D':
+		{
+			char *tmp = strchr(pattern_space, '\n');
+			if (tmp) {
+				overlapping_strcpy(pattern_space, tmp + 1);
+				goto restart;
+			}
+		}
+		/* discard this line. */
+		case 'd':
+			goto discard_line;
+
+		/* Substitute with regex */
+		case 's':
+			if (!do_subst_command(sed_cmd, &pattern_space))
+				break;
+			dbg("do_subst_command succeeded:'%s'", pattern_space);
+			substituted |= 1;
+
+			/* handle p option */
+			if (sed_cmd->sub_p)
+				sed_puts(pattern_space, last_gets_char);
+			/* handle w option */
+			if (sed_cmd->sw_file)
+				puts_maybe_newline(
+					pattern_space, sed_cmd->sw_file,
+					&sed_cmd->sw_last_char, last_gets_char);
+			break;
+
+		/* Append line to linked list to be printed later */
+		case 'a':
+			append(sed_cmd->string);
+			break;
+
+		/* Insert text before this line */
+		case 'i':
+			sed_puts(sed_cmd->string, '\n');
+			break;
+
+		/* Cut and paste text (replace) */
+		case 'c':
+			/* Only triggers on last line of a matching range. */
+			if (!sed_cmd->in_match)
+				sed_puts(sed_cmd->string, '\n');
+			goto discard_line;
+
+		/* Read file, append contents to output */
+		case 'r':
+		{
+			FILE *rfile;
+			rfile = fopen_for_read(sed_cmd->string);
+			if (rfile) {
+				char *line;
+
+				while ((line = xmalloc_fgetline(rfile))
+						!= NULL)
+					append(line);
+				xprint_and_close_file(rfile);
+			}
+
+			break;
+		}
+
+		/* Write pattern space to file. */
+		case 'w':
+			puts_maybe_newline(
+				pattern_space, sed_cmd->sw_file,
+				&sed_cmd->sw_last_char, last_gets_char);
+			break;
+
+		/* Read next line from input */
+		case 'n':
+			if (!G.be_quiet)
+				sed_puts(pattern_space, last_gets_char);
+			if (next_line) {
+				free(pattern_space);
+				pattern_space = next_line;
+				last_gets_char = next_gets_char;
+				next_line = get_next_line(&next_gets_char);
+				substituted = 0;
+				linenum++;
+				break;
+			}
+			/* fall through */
+
+		/* Quit.  End of script, end of input. */
+		case 'q':
+			/* Exit the outer while loop */
+			free(next_line);
+			next_line = NULL;
+			goto discard_commands;
+
+		/* Append the next line to the current line */
+		case 'N':
+		{
+			int len;
+			/* If no next line, jump to end of script and exit. */
+			/* http://www.gnu.org/software/sed/manual/sed.html:
+			 * "Most versions of sed exit without printing anything
+			 * when the N command is issued on the last line of
+			 * a file. GNU sed prints pattern space before exiting
+			 * unless of course the -n command switch has been
+			 * specified. This choice is by design."
+			 */
+			if (next_line == NULL) {
+				//goto discard_line;
+				goto discard_commands; /* GNU behavior */
+			}
+			/* Append next_line, read new next_line. */
+			len = strlen(pattern_space);
+			pattern_space = xrealloc(pattern_space, len + strlen(next_line) + 2);
+			pattern_space[len] = '\n';
+			strcpy(pattern_space + len+1, next_line);
+			last_gets_char = next_gets_char;
+			next_line = get_next_line(&next_gets_char);
+			linenum++;
+			break;
+		}
+
+		/* Test/branch if substitution occurred */
+		case 't':
+			if (!substituted) break;
+			substituted = 0;
+			/* Fall through */
+		/* Test/branch if substitution didn't occur */
+		case 'T':
+			if (substituted) break;
+			/* Fall through */
+		/* Branch to label */
+		case 'b':
+			if (!sed_cmd->string) goto discard_commands;
+			else sed_cmd = branch_to(sed_cmd->string);
+			break;
+		/* Transliterate characters */
+		case 'y':
+		{
+			int i, j;
+			for (i = 0; pattern_space[i]; i++) {
+				for (j = 0; sed_cmd->string[j]; j += 2) {
+					if (pattern_space[i] == sed_cmd->string[j]) {
+						pattern_space[i] = sed_cmd->string[j + 1];
+						break;
+					}
+				}
+			}
+
+			break;
+		}
+		case 'g':	/* Replace pattern space with hold space */
+			free(pattern_space);
+			pattern_space = xstrdup(G.hold_space ? G.hold_space : "");
+			break;
+		case 'G':	/* Append newline and hold space to pattern space */
+		{
+			int pattern_space_size = 2;
+			int hold_space_size = 0;
+
+			if (pattern_space)
+				pattern_space_size += strlen(pattern_space);
+			if (G.hold_space)
+				hold_space_size = strlen(G.hold_space);
+			pattern_space = xrealloc(pattern_space,
+					pattern_space_size + hold_space_size);
+			if (pattern_space_size == 2)
+				pattern_space[0] = 0;
+			strcat(pattern_space, "\n");
+			if (G.hold_space)
+				strcat(pattern_space, G.hold_space);
+			last_gets_char = '\n';
+
+			break;
+		}
+		case 'h':	/* Replace hold space with pattern space */
+			free(G.hold_space);
+			G.hold_space = xstrdup(pattern_space);
+			break;
+		case 'H':	/* Append newline and pattern space to hold space */
+		{
+			int hold_space_size = 2;
+			int pattern_space_size = 0;
+
+			if (G.hold_space)
+				hold_space_size += strlen(G.hold_space);
+			if (pattern_space)
+				pattern_space_size = strlen(pattern_space);
+			G.hold_space = xrealloc(G.hold_space,
+					hold_space_size + pattern_space_size);
+
+			if (hold_space_size == 2)
+				*G.hold_space = 0;
+			strcat(G.hold_space, "\n");
+			if (pattern_space)
+				strcat(G.hold_space, pattern_space);
+
+			break;
+		}
+		case 'x': /* Exchange hold and pattern space */
+		{
+			char *tmp = pattern_space;
+			pattern_space = G.hold_space ? G.hold_space : xzalloc(1);
+			last_gets_char = '\n';
+			G.hold_space = tmp;
+			break;
+		}
+		} /* switch */
+	} /* for each cmd */
+
+	/*
+	 * Exit point from sedding...
+	 */
+ discard_commands:
+	/* we will print the line unless we were told to be quiet ('-n')
+	   or if the line was suppressed (ala 'd'elete) */
+	if (!G.be_quiet)
+		sed_puts(pattern_space, last_gets_char);
+
+	/* Delete and such jump here. */
+ discard_line:
+	flush_append();
+	free(pattern_space);
+
+	goto again;
+}
+
+/* It is possible to have a command line argument with embedded
+ * newlines.  This counts as multiple command lines.
+ * However, newline can be escaped: 's/e/z\<newline>z/'
+ * We check for this.
+ */
+
+static void add_cmd_block(char *cmdstr)
+{
+	char *sv, *eol;
+
+	cmdstr = sv = xstrdup(cmdstr);
+	do {
+		eol = strchr(cmdstr, '\n');
+ next:
+		if (eol) {
+			/* Count preceding slashes */
+			int slashes = 0;
+			char *sl = eol;
+
+			while (sl != cmdstr && *--sl == '\\')
+				slashes++;
+			/* Odd number of preceding slashes - newline is escaped */
+			if (slashes & 1) {
+				overlapping_strcpy(eol - 1, eol);
+				eol = strchr(eol, '\n');
+				goto next;
+			}
+			*eol = '\0';
+		}
+		add_cmd(cmdstr);
+		cmdstr = eol + 1;
+	} while (eol);
+	free(sv);
+}
+
+int sed_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int sed_main(int argc UNUSED_PARAM, char **argv)
+{
+	unsigned opt;
+	llist_t *opt_e, *opt_f;
+	char *opt_i;
+
+#if ENABLE_LONG_OPTS
+	static const char sed_longopts[] ALIGN1 =
+		/* name             has_arg             short */
+		"in-place\0"        Optional_argument   "i"
+		"regexp-extended\0" No_argument         "r"
+		"quiet\0"           No_argument         "n"
+		"silent\0"          No_argument         "n"
+		"expression\0"      Required_argument   "e"
+		"file\0"            Required_argument   "f";
+#endif
+
+	int status = EXIT_SUCCESS;
+
+	INIT_G();
+
+	/* destroy command strings on exit */
+	if (ENABLE_FEATURE_CLEAN_UP) atexit(sed_free_and_close_stuff);
+
+	/* Lie to autoconf when it starts asking stupid questions. */
+	if (argv[1] && strcmp(argv[1], "--version") == 0) {
+		puts("This is not GNU sed version 4.0");
+		return 0;
+	}
+
+	/* do normal option parsing */
+	opt_e = opt_f = NULL;
+	opt_i = NULL;
+	opt_complementary = "e::f::" /* can occur multiple times */
+	                    "nn"; /* count -n */
+
+	IF_LONG_OPTS(applet_long_options = sed_longopts);
+
+	/* -i must be first, to match OPT_in_place definition */
+	opt = getopt32(argv, "i::rne:f:", &opt_i, &opt_e, &opt_f,
+			    &G.be_quiet); /* counter for -n */
+	//argc -= optind;
+	argv += optind;
+	if (opt & OPT_in_place) { // -i
+		atexit(cleanup_outname);
+	}
+	if (opt & 0x2) G.regex_type |= REG_EXTENDED; // -r
+	//if (opt & 0x4) G.be_quiet++; // -n
+	while (opt_e) { // -e
+		add_cmd_block(llist_pop(&opt_e));
+	}
+	while (opt_f) { // -f
+		char *line;
+		FILE *cmdfile;
+		cmdfile = xfopen_for_read(llist_pop(&opt_f));
+		while ((line = xmalloc_fgetline(cmdfile)) != NULL) {
+			add_cmd(line);
+			free(line);
+		}
+		fclose(cmdfile);
+	}
+	/* if we didn't get a pattern from -e or -f, use argv[0] */
+	if (!(opt & 0x18)) {
+		if (!*argv)
+			bb_show_usage();
+		add_cmd_block(*argv++);
+	}
+	/* Flush any unfinished commands. */
+	add_cmd("");
+
+	/* By default, we write to stdout */
+	G.nonstdout = stdout;
+
+	/* argv[0..(argc-1)] should be names of file to process. If no
+	 * files were specified or '-' was specified, take input from stdin.
+	 * Otherwise, we process all the files specified. */
+	if (argv[0] == NULL) {
+		if (opt & OPT_in_place)
+			bb_error_msg_and_die(bb_msg_requires_arg, "-i");
+		add_input_file(stdin);
+	} else {
+		int i;
+
+		for (i = 0; argv[i]; i++) {
+			struct stat statbuf;
+			int nonstdoutfd;
+			FILE *file;
+			sed_cmd_t *sed_cmd;
+
+			if (LONE_DASH(argv[i]) && !(opt & OPT_in_place)) {
+				add_input_file(stdin);
+				process_files();
+				continue;
+			}
+			file = fopen_or_warn(argv[i], "r");
+			if (!file) {
+				status = EXIT_FAILURE;
+				continue;
+			}
+			add_input_file(file);
+			if (!(opt & OPT_in_place)) {
+				continue;
+			}
+
+			/* -i: process each FILE separately: */
+
+			G.outname = xasprintf("%sXXXXXX", argv[i]);
+			nonstdoutfd = xmkstemp(G.outname);
+			G.nonstdout = xfdopen_for_write(nonstdoutfd);
+
+			/* Set permissions/owner of output file */
+			fstat(fileno(file), &statbuf);
+			/* chmod'ing AFTER chown would preserve suid/sgid bits,
+			 * but GNU sed 4.2.1 does not preserve them either */
+			fchmod(nonstdoutfd, statbuf.st_mode);
+			fchown(nonstdoutfd, statbuf.st_uid, statbuf.st_gid);
+
+			process_files();
+			fclose(G.nonstdout);
+			G.nonstdout = stdout;
+
+			if (opt_i) {
+				char *backupname = xasprintf("%s%s", argv[i], opt_i);
+				xrename(argv[i], backupname);
+				free(backupname);
+			}
+			/* else unlink(argv[i]); - rename below does this */
+			xrename(G.outname, argv[i]); //TODO: rollback backup on error?
+			free(G.outname);
+			G.outname = NULL;
+
+			/* Re-enable disabled range matches */
+			for (sed_cmd = G.sed_cmd_head; sed_cmd; sed_cmd = sed_cmd->next) {
+				sed_cmd->beg_line = sed_cmd->beg_line_orig;
+			}
+		}
+		/* Here, to handle "sed 'cmds' nonexistent_file" case we did:
+		 * if (G.current_input_file >= G.input_file_count)
+		 *	return status;
+		 * but it's not needed since process_files() works correctly
+		 * in this case too. */
+	}
+	process_files();
+
+	return status;
+}