Promote sed to posix.

1 files changed, 0 insertions, 1002 deletions

diff --git a/toys/pending/sed.c b/toys/pending/sed.c
deleted file mode 100644
index a5c24454..00000000
--- a/toys/pending/sed.c
+++ /dev/null
@@ -1,1002 +0,0 @@
-/* sed.c - stream editor. Thing that does s/// and other stuff.
- *
- * Copyright 2014 Rob Landley <rob@landley.net>
- *
- * See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/sed.html
- *
- * TODO: lines > 2G could signed int wrap length counters. Not just getline()
- * but N and s///
-
-USE_SED(NEWTOY(sed, "(version)e*f*inr", TOYFLAG_USR|TOYFLAG_BIN|TOYFLAG_LOCALE))
-
-config SED
-  bool "sed"
-  default n
-  help
-    usage: sed [-inr] [-e SCRIPT]...|SCRIPT [-f SCRIPT_FILE]... [FILE...]
-
-    Stream editor. Apply one or more editing SCRIPTs to each line of input
-    (from FILE or stdin) producing output (by default to stdout).
-
-    -e	add SCRIPT to list
-    -f	add contents of SCRIPT_FILE to list
-    -i	Edit each file in place.
-    -n	No default output. (Use the p command to output matched lines.)
-    -r	Use extended regular expression syntax.
-    -s	Treat input files separately (implied by -i)
-
-    A SCRIPT is a series of one or more COMMANDs separated by newlines or
-    semicolons. All -e SCRIPTs are concatenated together as if separated
-    by newlines, followed by all lines from -f SCRIPT_FILEs, in order.
-    If no -e or -f SCRIPTs are specified, the first argument is the SCRIPT.
-
-    Each COMMAND may be preceded by an address which limits the command to
-    apply only to the specified line(s). Commands without an address apply to
-    every line. Addresses are of the form:
-
-      [ADDRESS[,ADDRESS]]COMMAND
-
-    The ADDRESS may be a decimal line number (starting at 1), a /regular
-    expression/ within a pair of forward slashes, or the character "$" which
-    matches the last line of input. (In -s or -i mode this matches the last
-    line of each file, otherwise just the last line of the last file.) A single
-    address matches one line, a pair of comma separated addresses match
-    everything from the first address to the second address (inclusive). If
-    both addresses are regular expressions, more than one range of lines in
-    each file can match.
-
-    REGULAR EXPRESSIONS in sed are started and ended by the same character
-    (traditionally / but anything except a backslash or a newline works).
-    Backslashes may be used to escape the delimiter if it occurs in the
-    regex, and for the usual printf escapes (\abcefnrtv and octal, hex,
-    and unicode). An empty regex repeats the previous one. ADDRESS regexes
-    (above) require the first delimeter to be escaped with a backslash when
-    it isn't a forward slash (to distinguish it from the COMMANDs below).
-
-    Sed mostly operates on individual lines one at a time. It reads each line,
-    processes it, and either writes it to the output or discards it before
-    reading the next line. Sed can remember one additional line in a separate
-    buffer (using the h, H, g, G, and x commands), and can read the next line
-    of input early (using the n and N command), but other than that command
-    scripts operate on individual lines of text.
-
-    Each COMMAND starts with a single character. The following commands take
-    no arguments:
-
-      {  Start a new command block, continuing until a corresponding "}".
-         Command blocks may nest. If the block has an address, commands within
-         the block are only run for lines within the block's address range.
-
-      }  End command block (this command cannot have an address)
-
-      d  Delete this line and move on to the next one
-         (ignores remaining COMMANDs)
-
-      D  Delete one line of input and restart command SCRIPT (same as "d"
-         unless you've glued lines together with "N" or similar)
-
-      g  Get remembered line (overwriting current line)
-
-      G  Get remembered line (appending to current line)
-
-      h  Remember this line (overwriting remembered line)
-
-      H  Remember this line (appending to remembered line, if any)
-
-      l  Print line, escaping \abfrtv (but not newline), octal escaping other
-         nonprintable characters, wrapping lines to terminal width with a
-         backslash, and appending $ to actual end of line.
-
-      n  Print default output and read next line, replacing current line
-         (If no next line available, quit processing script)
-
-      N  Append next line of input to this line, separated by a newline
-         (This advances the line counter for address matching and "=", if no
-         next line available quit processing script without default output)
-
-      p  Print this line
-
-      P  Print this line up to first newline (from "N")
-
-      q  Quit (print default output, no more commands processed or lines read)
-
-      x  Exchange this line with remembered line (overwrite in both directions)
-
-      =  Print the current line number (followed by a newline)
-
-    The following commands (may) take an argument. The "text" arguments (to
-    the "a", "b", and "c" commands) may end with an unescaped "\" to append
-    the next line (for which leading whitespace is not skipped), and also
-    treat ";" as a literal character (use "\;" instead).
-
-      a [text]   Append text to output before attempting to read next line
-
-      b [label]  Branch, jumps to :label (or with no label, to end of SCRIPT)
-
-      c [text]   Delete line, output text at end of matching address range
-                 (ignores remaining COMMANDs)
-
-      i [text]   Print text
-
-      r [file]   Append contents of file to output before attempting to read
-                 next line.
-
-      s/S/R/F    Search for regex S, replace matched text with R using flags F.
-                 The first character after the "s" (anything but newline or
-                 backslash) is the delimiter, escape with \ to use normally.
-
-                 The replacement text may contain "&" to substitute the matched
-                 text (escape it with backslash for a literal &), or \1 through
-                 \9 to substitute a parenthetical subexpression in the regex.
-                 You can also use the normal backslash escapes such as \n and
-                 a backslash at the end of the line appends the next line.
-
-                 The flags are:
-
-                 [0-9]    A number, substitute only that occurrence of pattern
-                 g        Global, substitute all occurrences of pattern
-                 i        Ignore case when matching
-                 p        Print the line if match was found and replaced
-                 w [file] Write (append) line to file if match replaced
-
-      t [label]  Test, jump to :label only if an "s" command found a match in
-                 this line since last test (replacing with same text counts)
-
-      T [label]  Test false, jump only if "s" hasn't found a match.
-
-      w [file]   Write (append) line to file
-
-      y/old/new/ Change each character in 'old' to corresponding character
-                 in 'new' (with standard backslash escapes, delimiter can be
-                 any repeated character except \ or \n)
-
-      : [label]  Labeled target for jump commands
-
-      #  Comment, ignore rest of this line of SCRIPT
-
-    Deviations from posix: allow extended regular expressions with -r,
-    editing in place with -i, separate with -s, printf escapes in text, line
-    continuations, semicolons after all commands, 2-address anywhere an
-    address is allowed, "T" command, multiline continuations for [abc],
-    \; to end [abc] argument before end of line.
-*/
-
-#define FOR_sed
-#include "toys.h"
-
-GLOBALS(
-  struct arg_list *f;
-  struct arg_list *e;
-
-  // processed pattern list
-  struct double_list *pattern;
-
-  char *nextline, *remember;
-  void *restart, *lastregex;
-  long nextlen, rememberlen, count;
-  int fdout, noeol;
-  unsigned xx;
-)
-
-struct step {
-  struct step *next, *prev;
-
-  // Begin and end of each match
-  long lmatch[2];
-  int rmatch[2], arg1, arg2, w; // offsets because remalloc()
-  unsigned not, hit, sflags;
-  char c; // action
-};
-
-// Write out line with potential embedded NUL, handling eol/noeol
-static int emit(char *line, long len, int eol)
-{
-  int l, old = line[len];
-
-  if (TT.noeol && !writeall(TT.fdout, "\n", 1)) return 1;
-  if (eol) line[len++] = '\n';
-  if (!len) return 0;
-  TT.noeol = len && !eol;
-  l = writeall(TT.fdout, line, len);
-  if (eol) line[len-1] = old;
-  if (l != len) {
-    perror_msg("short write");
-
-    return 1;
-  }
-
-  return 0;
-}
-
-// Do regex matching handling embedded NUL bytes in string. Note that
-// neither the pattern nor the match can currently include NUL bytes
-// (even with wildcards) and string must be null terminated.
-static int ghostwheel(regex_t *preg, char *string, long len, int nmatch,
-  regmatch_t pmatch[], int eflags)
-{
-  char *s = string;
-
-  for (;;) {
-    long ll = 0;
-    int rc;
-
-    while (len && !*s) {
-      s++;
-      len--;
-    }
-    while (s[ll] && ll<len) ll++;
-
-    rc = regexec(preg, s, nmatch, pmatch, eflags);
-    if (!rc) {
-      for (rc = 0; rc<nmatch && pmatch[rc].rm_so!=-1; rc++) {
-        pmatch[rc].rm_so += s-string;
-        pmatch[rc].rm_eo += s-string;
-      }
-          
-      return 0;
-    }
-    if (ll==len) return rc;
-
-    s += ll;
-    len -= ll;
-  }
-}
-
-// Extend allocation to include new string, with newline between if newlen<0
-
-static char *extend_string(char **old, char *new, int oldlen, int newlen)
-{
-  int newline = newlen < 0;
-  char *s;
-
-  if (newline) newlen = -newlen;
-  s = *old = xrealloc(*old, oldlen+newlen+newline+1);
-  if (newline) s[oldlen++] = '\n';
-  memcpy(s+oldlen, new, newlen);
-  s[oldlen+newlen] = 0;
-
-  return s+oldlen+newlen+1;
-}
-
-// An empty regex repeats the previous one
-void *get_regex(void *trump, int offset)
-{
-  if (!offset) {
-    if (!TT.lastregex) error_exit("no previous regex");
-    return TT.lastregex;
-  }
-
-  return TT.lastregex = offset+(char *)trump;
-}
-
-// Apply pattern to line from input file
-static void walk_pattern(char **pline, long plen)
-{
-  struct append {
-    struct append *next, *prev;
-    int file;
-    char *str;
-  } *append = 0;
-  char *line = TT.nextline;
-  long len = TT.nextlen;
-  struct step *logrus;
-  int eol = 0, tea = 0;
-
-  // Grab next line for deferred processing (EOF detection: we get a NULL
-  // pline at EOF to flush last line). Note that only end of _last_ input
-  // file matches $ (unless we're doing -i).
-  TT.nextline = 0;
-  TT.nextlen = 0;
-  if (pline) {
-    TT.nextline = *pline;
-    TT.nextlen = plen;
-    *pline = 0;
-  }
-
-  if (!line || !len) return;
-  if (line[len-1] == '\n') line[--len] = eol++;
-  TT.count++;
-
-  logrus = TT.restart ? TT.restart : (void *)TT.pattern;
-  TT.restart = 0;
-
-  while (logrus) {
-    char *str, c = logrus->c;
-
-    // Have we got a line or regex matching range for this rule?
-    if (*logrus->lmatch || *logrus->rmatch) {
-      int miss = 0;
-      long lm;
-
-      // In a match that might end?
-      if (logrus->hit) {
-        if (!(lm = logrus->lmatch[1])) {
-          if (!logrus->rmatch[1]) logrus->hit = 0;
-          else {
-            void *rm = get_regex(logrus, logrus->rmatch[1]);
-
-            // regex match end includes matching line, so defer deactivation
-            if (line && !ghostwheel(rm, line, len, 0, 0, 0)) miss = 1;
-          }
-        } else if (lm > 0 && lm < TT.count) logrus->hit = 0;
-
-      // Start a new match?
-      } else {
-        if (!(lm = *logrus->lmatch)) {
-          void *rm = get_regex(logrus, *logrus->rmatch);
-
-          if (line && !ghostwheel(rm, line, len, 0, 0, 0)) logrus->hit++;
-        } else if (lm == TT.count || (lm == -1 && !pline)) logrus->hit++;
-
-        if (!logrus->lmatch[1] && !logrus->rmatch[1]) miss = 1;
-      } 
-
-      // Didn't match?
-      lm = !(logrus->hit ^ logrus->not);
-
-      // Deferred disable from regex end match
-      if (miss || logrus->lmatch[1] == TT.count) logrus->hit = 0;
-
-      if (lm) {
-        // Handle skipping curly bracket command group
-        if (c == '{') {
-          int curly = 1;
-
-          while (curly) {
-            logrus = logrus->next;
-            if (logrus->c == '{') curly++;
-            if (logrus->c == '}') curly--;
-          }
-        }
-        logrus = logrus->next;
-        continue;
-      }
-    }
-
-    // A deleted line can still update line match state for later commands
-    if (!line) {
-      logrus = logrus->next;
-      continue;
-    }
-
-    // Process command
-
-    if (c=='a' || c=='r') {
-      struct append *a = xzalloc(sizeof(struct append));
-      a->str = logrus->arg1+(char *)logrus;
-      a->file = c== 'r';
-      dlist_add_nomalloc((void *)&append, (void *)a);
-    } else if (c=='b' || c=='t' || c=='T') {
-      int t = tea;
-
-      if (c != 'b') tea = 0;
-      if (c=='b' || t^(c=='T')) {
-        if (!logrus->arg1) break;
-        str = logrus->arg1+(char *)logrus;
-        for (logrus = (void *)TT.pattern; logrus; logrus = logrus->next)
-          if (logrus->c == ':' && !strcmp(logrus->arg1+(char *)logrus, str))
-            break;
-        if (!logrus) error_exit("no :%s", str);
-      }
-    } else if (c=='c') {
-      str = logrus->arg1+(char *)logrus;
-      if (!logrus->hit) emit(str, strlen(str), 1);
-      free(line);
-      line = 0;
-      continue;
-    } else if (c=='d') {
-      free(line);
-      line = 0;
-      continue;
-    } else if (c=='D') {
-      // Delete up to \n or end of buffer
-      str = line;
-      while ((str-line)<len) if (*(str++) == '\n') break;
-      len -= str - line;
-      memmove(line, str, len);
-
-      // if "delete" blanks line, disable further processing
-      // otherwise trim and restart script
-      if (!len) {
-        free(line);
-        line = 0;
-      } else {
-        line[len] = 0;
-        logrus = (void *)TT.pattern;
-      }
-      continue;
-    } else if (c=='g') {
-      free(line);
-      line = xstrdup(TT.remember);
-      len = TT.rememberlen;
-    } else if (c=='G') {
-      line = xrealloc(line, len+TT.rememberlen+2);
-      line[len++] = '\n';
-      memcpy(line+len, TT.remember, TT.rememberlen);
-      line[len += TT.rememberlen] = 0;
-    } else if (c=='h') {
-      free(TT.remember);
-      TT.remember = xstrdup(line);
-      TT.rememberlen = len;
-    } else if (c=='H') {
-      TT.remember = xrealloc(TT.remember, TT.rememberlen+len+2);
-      TT.remember[TT.rememberlen++] = '\n';
-      memcpy(TT.remember+TT.rememberlen, line, len);
-      TT.remember[TT.rememberlen += len] = 0;
-    } else if (c=='i') {
-      str = logrus->arg1+(char *)logrus;
-      emit(str, strlen(str), 1);
-    } else if (c=='l') {
-      int i, x, off;
-
-      if (!TT.xx) {
-        terminal_size(&TT.xx, 0);
-        if (!TT.xx) TT.xx = 80;
-        if (TT.xx > sizeof(toybuf)-10) TT.xx = sizeof(toybuf)-10;
-        if (TT.xx > 4) TT.xx -= 4;
-      }
-
-      for (i = off = 0; i<len; i++) {
-        if (off >= TT.xx) {
-          toybuf[off++] = '\\';
-          emit(toybuf, off, 1);
-          off = 0;
-        }
-        x = stridx("\\\a\b\f\r\t\v", line[i]);
-        if (x != -1) {
-          toybuf[off++] = '\\';
-          toybuf[off++] = "\\abfrtv"[x];
-        } else if (line[i] >= ' ') toybuf[off++] = line[i];
-        else off += sprintf(toybuf+off, "\\%03o", line[i]);
-      }
-      toybuf[off++] = '$';
-      emit(toybuf, off, 1);
-    } else if (c=='n') {
-      TT.restart = logrus->next;
-
-      break;
-    } else if (c=='N') {
-      // Can't just grab next line because we could have multiple N and
-      // we need to actually read ahead to get N;$p EOF detection right.
-      if (pline) {
-        TT.restart = logrus->next;
-        extend_string(&line, TT.nextline, len, -TT.nextlen);
-        free(TT.nextline);
-        TT.nextline = line;
-        TT.nextlen += len + 1;
-        line = 0;
-      }
-
-      // Pending append goes out right after N
-      goto done; 
-    } else if (c=='p' || c=='P') {
-      char *l = (c=='P') ? strchr(line, '\n') : 0;
-
-      if (emit(line, l ? l-line : len, eol)) break;
-    } else if (c=='q') {
-      if (pline) *pline = (void *)1;
-      free(TT.nextline);
-      TT.nextline = 0;
-      TT.nextlen = 0;
-
-      break;
-    } else if (c=='s') {
-      char *rline = line, *new = logrus->arg2 + (char *)logrus, *swap, *rswap;
-      regmatch_t *match = (void *)toybuf;
-      regex_t *reg = get_regex(logrus, logrus->arg1);
-      int mflags = 0, count = 0, zmatch = 1, rlen = len, mlen, off, newlen;
-
-      // Find match in remaining line (up to remaining len)
-      while (!ghostwheel(reg, rline, rlen, 10, match, mflags)) {
-        mflags = REG_NOTBOL;
-
-        // Zero length matches don't count immediately after a previous match
-        mlen = match[0].rm_eo-match[0].rm_so;
-        if (!mlen && !zmatch) {
-          if (!rlen--) break;
-          rline++;
-          zmatch++;
-          continue;
-        } else zmatch = 0;
-
-        // If we're replacing only a specific match, skip if this isn't it
-        off = logrus->sflags>>3;
-        if (off && off != ++count) {
-          rline += match[0].rm_eo;
-          rlen -= match[0].rm_eo;
-
-          continue;
-        }
-        // The fact getline() can allocate unbounded amounts of memory is
-        // a bigger issue, but while we're here check for integer overflow
-        if (match[0].rm_eo > INT_MAX) perror_exit(0);
-
-        // newlen = strlen(new) but with \1 and & and printf escapes
-        for (off = newlen = 0; new[off]; off++) {
-          int cc = -1;
-
-          if (new[off] == '&') cc = 0;
-          else if (new[off] == '\\') cc = new[++off] - '0';
-          if (cc < 0 || cc > 9) {
-            newlen++;
-            continue;
-          }
-          newlen += match[cc].rm_eo-match[cc].rm_so;
-        }
-
-        // Allocate new size, copy start/end around match. (Can't extend in
-        // place because backrefs may refer to text after it's overwritten.)
-        len += newlen-mlen;
-        swap = xmalloc(len+1);
-        rswap = swap+(rline-line)+match[0].rm_so;
-        memcpy(swap, line, (rline-line)+match[0].rm_so);
-        memcpy(rswap+newlen, rline+match[0].rm_eo, (rlen -= match[0].rm_eo)+1);
-
-        // copy in new replacement text
-        for (off = mlen = 0; new[off]; off++) {
-          int cc = 0, ll;
-
-          if (new[off] == '\\') {
-            cc = new[++off] - '0';
-            if (cc<0 || cc>9) {
-              if (!(rswap[mlen++] = unescape(new[off])))
-                rswap[mlen-1] = new[off];
-
-              continue;
-            } else if (match[cc].rm_so == -1) error_exit("no s//\\%d/", cc);
-          } else if (new[off] != '&') {
-            rswap[mlen++] = new[off];
-
-            continue;
-          }
-
-          ll = match[cc].rm_eo-match[cc].rm_so;
-          memcpy(rswap+mlen, rline+match[cc].rm_so, ll);
-          mlen += ll;
-        }
-
-        rline = rswap+newlen;
-        free(line);
-        line = swap;
-
-        // Stop after first substitution unless we have flag g
-        if (!(logrus->sflags & 2)) break;
-      }
-
-      if (mflags) {
-        // flag p
-        if (logrus->sflags & 4) emit(line, len, eol);
-
-        tea = 1;
-        if (logrus->w) goto writenow;
-      }
-    } else if (c=='w') {
-      int fd, noeol;
-      char *name;
-
-writenow:
-      // Swap out emit() context
-      fd = TT.fdout;
-      noeol = TT.noeol;
-
-      // We save filehandle and newline status before filename
-      name = logrus->w + (char *)logrus;
-      memcpy(&TT.fdout, name, 4);
-      name += 4;
-      TT.noeol = *(name++);
-
-      // write, then save/restore context
-      if (emit(line, len, eol))
-        perror_exit("w '%s'", logrus->arg1+(char *)logrus);
-      *(--name) = TT.noeol;
-      TT.noeol = noeol;
-      TT.fdout = fd;
-    } else if (c=='x') {
-      long swap = TT.rememberlen;
-
-      str = TT.remember;
-      TT.remember = line;
-      line = str;
-      TT.rememberlen = len;
-      len = swap;
-    } else if (c=='y') {
-      char *from, *to = (char *)logrus;
-      int i, j;
-
-      from = to+logrus->arg1;
-      to += logrus->arg2;
-
-      for (i = 0; i < len; i++) {
-        j = stridx(from, line[i]);
-        if (j != -1) line[i] = to[j];
-      }
-    } else if (c=='=') {
-      sprintf(toybuf, "%ld", TT.count);
-      emit(toybuf, strlen(toybuf), 1);
-    }
-
-    logrus = logrus->next;
-  }
-
-  if (line && !(toys.optflags & FLAG_n)) emit(line, len, eol);
-
-done:
-  free(line);
-
-  if (dlist_terminate(append)) while (append) {
-    struct append *a = append->next;
-
-    if (append->file) {
-      int fd = xopen(append->str, O_RDONLY);
-
-      // Force newline if noeol pending
-      emit(0, 0, 0);
-      xsendfile(fd, TT.fdout);
-      close(fd);
-    } else emit(append->str, strlen(append->str), 1);
-    free(append);
-    append = a;
-  }
-}
-
-// Genericish function, can probably get moved to lib.c
-
-// Iterate over lines in file, calling function. Function can write 0 to
-// the line pointer if they want to keep it, or 1 to terminate processing,
-// otherwise line is freed. Passed file descriptor is closed at the end.
-static void do_lines(int fd, char *name, void (*call)(char **pline, long len))
-{
-  FILE *fp = fd ? xfdopen(fd, "r") : stdin;
-
-  for (;;) {
-    char *line = 0;
-    ssize_t len;
-
-    len = getline(&line, (void *)&len, fp);
-    if (len > 0) {
-      call(&line, len);
-      if (line == (void *)1) break;
-      free(line);
-    } else break;
-  }
-
-  if (fd) fclose(fp);
-}
-
-static void do_sed(int fd, char *name)
-{
-  int i = toys.optflags & FLAG_i;
-  char *tmp;
-
-  if (i) {
-    struct step *primal;
-
-    if (!fd && *name=='-') {
-      error_msg("no -i on stdin");
-      return;
-    }
-    TT.fdout = copy_tempfile(fd, name, &tmp);
-    TT.count = 0;
-    for (primal = (void *)TT.pattern; primal; primal = primal->next)
-      primal->hit = 0;
-  }
-  do_lines(fd, name, walk_pattern);
-  if (i) {
-    walk_pattern(0, 0);
-    replace_tempfile(-1, TT.fdout, &tmp);
-    TT.fdout = 1;
-    TT.nextline = 0;
-    TT.nextlen = TT.noeol = 0;
-  }
-}
-
-// Copy chunk of string between two delimiters, converting printf escapes.
-// returns processed copy of string (0 if error), *pstr advances to next
-// unused char. if delim (or *delim) is 0 uses/saves starting char as delimiter
-// if regxex, ignore delimiter in [ranges]
-static char *unescape_delimited_string(char **pstr, char *delim, int regex)
-{
-  char *to, *from, d;
-
-  to = from = *pstr;
-  if (!delim || !*delim) {
-    if (!(d = *(from++))) return 0;
-    if (d == '\\') d = *(from++);
-    if (!d || d == '\\') return 0;
-    if (delim) *delim = d;
-  } else d = *delim;
-  to = delim = xmalloc(strlen(*pstr)+1);
-
-  while (*from != d) {
-    if (!*from) return 0;
-
-    // delimiter in regex character range doesn't count
-    if (*from == '[') {
-      int len = 1;
-
-      if (from[len] == ']') len++;
-      while (from[len] != ']') if (!from[len++]) return 0;
-      memmove(to, from, ++len);
-      to += len;
-      from += len;
-      continue;
-    }
-    if (*from == '\\') {
-      if (!from[1]) return 0;
-
-      // Check escaped end delimiter before printf style escapes.
-      if (from[1] == d) from++;
-      else if (from[1]=='\\') *(to++) = *(from++);
-      else {
-        char c = unescape(from[1]);
-
-        if (c) {
-          *(to++) = c;
-          from+=2;
-          continue;
-        }
-      }
-    }
-    *(to++) = *(from++);
-  }
-  *to = 0;
-  *pstr = from+1;
-
-  return delim;
-}
-
-// Translate primal pattern into walkable form.
-static void jewel_of_judgement(char **pline, long len)
-{
-  struct step *corwin = (void *)TT.pattern;
-  char *line = *pline, *reg, c, *errstart = *pline;
-  int i;
-
-  // Append additional line to pattern argument string?
-  if (corwin && corwin->prev->hit) {
-    // Remove half-finished entry from list so remalloc() doesn't confuse it
-    TT.pattern = TT.pattern->prev;
-    corwin = dlist_pop(&TT.pattern);
-    corwin->hit = 0;
-    c = corwin->c;
-    reg = (char *)corwin;
-    reg += corwin->arg1 + strlen(reg + corwin->arg1);
-
-    // Resume parsing
-    goto append;
-  }
-
-  // Loop through commands in line
-
-  corwin = 0;
-  for (;;) {
-    if (corwin) dlist_add_nomalloc(&TT.pattern, (void *)corwin);
-
-    while (isspace(*line) || *line == ';') line++;
-    if (!*line || *line == '#') return;
-
-    errstart = line;
-    memset(toybuf, 0, sizeof(struct step));
-    corwin = (void *)toybuf;
-    reg = toybuf + sizeof(struct step);
-
-    // Parse address range (if any)
-    for (i = 0; i < 2; i++) {
-      if (*line == ',') line++;
-      else if (i) break;
-
-      if (isdigit(*line)) corwin->lmatch[i] = strtol(line, &line, 0);
-      else if (*line == '$') {
-        corwin->lmatch[i] = -1;
-        line++;
-      } else if (*line == '/' || *line == '\\') {
-        char *s = line;
-
-        if (!(s = unescape_delimited_string(&line, 0, 1))) goto brand;
-        if (!*s) corwin->rmatch[i] = 0;
-        else {
-          xregcomp((void *)reg, s, (toys.optflags & FLAG_r)*REG_EXTENDED);
-          corwin->rmatch[i] = reg-toybuf;
-          reg += sizeof(regex_t);
-        }
-        free(s);
-      } else break;
-    }
-
-    while (isspace(*line)) line++;
-    if (!*line) break;
-
-    while (*line == '!') {
-      corwin->not = 1;
-      line++;
-    }
-    while (isspace(*line)) line++;
-
-    c = corwin->c = *(line++);
-    if (strchr("}:", c) && i) break;
-    if (strchr("aiqr=", c) && i>1) break;
-
-    // Add step to pattern
-    corwin = xmalloc(reg-toybuf);
-    memcpy(corwin, toybuf, reg-toybuf);
-    reg = (reg-toybuf) + (char *)corwin;
-
-    // Parse arguments by command type
-    if (c == '{') TT.nextlen++;
-    else if (c == '}') {
-      if (!TT.nextlen--) break;
-    } else if (c == 's') {
-      char *merlin, *fiona, delim = 0;
-
-      // s/pattern/replacement/flags
-
-      // get pattern (just record, we parse it later)
-      corwin->arg1 = reg - (char *)corwin;
-      if (!(merlin = unescape_delimited_string(&line, &delim, 1))) goto brand;
-
-      // get replacement - don't replace escapes because \1 and \& need
-      // processing later, after we replace \\ with \ we can't tell \\1 from \1
-      fiona = line;
-      while (*line != delim) {
-        if (!*line) goto brand;
-        if (*line == '\\') {
-          if (!line[1]) goto brand;
-          line += 2;
-        } else line++;
-      }
-
-      corwin->arg2 = corwin->arg1 + sizeof(regex_t);
-      reg = extend_string((void *)&corwin, fiona, corwin->arg2, line-fiona)+1;
-
-      // get flags
-      for (line++; *line; line++) {
-        long l;
-
-        if (isspace(*line) && *line != '\n') continue;
-
-        if (0 <= (l = stridx("igp", *line))) corwin->sflags |= 1<<l;
-        else if (!(corwin->sflags>>3) && 0<(l = strtol(line, &line, 10))) {
-          corwin->sflags |= l << 3;
-          line--;
-        } else break;
-      }
-
-      // We deferred actually parsing the regex until we had the s///i flag
-      // allocating the space was done by extend_string() above
-      if (!*merlin) corwin->arg1 = 0;
-      else xregcomp((void *)(corwin->arg1 + (char *)corwin), merlin,
-        ((toys.optflags & FLAG_r)*REG_EXTENDED)|((corwin->sflags&1)*REG_ICASE));
-      free(merlin);
-      if (*line == 'w') {
-        line++;
-        goto writenow;
-      }
-    } else if (c == 'w') {
-      int fd, delim;
-      char *cc;
-
-      // Since s/// uses arg1 and arg2, and w needs a persistent filehandle and
-      // eol status, and to retain the filename for error messages, we'd need
-      // to go up to arg5 just for this. Compromise: dynamically allocate the
-      // filehandle and eol status.
-
-writenow:
-      while (isspace(*line)) line++;
-      if (!*line) goto brand;
-      for (cc = line; *cc; cc++) if (*cc == '\\' && cc[1] == ';') break;
-      delim = *cc;
-      *cc = 0;
-      fd = xcreate(line, O_WRONLY|O_CREAT|O_TRUNC, 0644);
-      *cc = delim;
-
-      corwin->w = reg - (char *)corwin;
-      corwin = xrealloc(corwin, corwin->w+(cc-line)+6);
-      reg = corwin->w + (char *)corwin;
-
-      memcpy(reg, &fd, 4);
-      reg += 4;
-      *(reg++) = 0;
-      memcpy(reg, line, delim);
-      reg += delim;
-      *(reg++) = 0;
-
-      line = cc;
-      if (delim) line += 2;
-    } else if (c == 'y') {
-      char *s, delim = 0;
-      int len;
-
-      if (!(s = unescape_delimited_string(&line, &delim, 0))) goto brand;
-      corwin->arg1 = reg-(char *)corwin;
-      len = strlen(s);
-      reg = extend_string((void *)&corwin, s, reg-(char *)corwin, len);
-      free(s);
-      corwin->arg2 = reg-(char *)corwin;
-      if (!(s = unescape_delimited_string(&line, &delim, 0))) goto brand;
-      if (len != strlen(s)) goto brand;
-      reg = extend_string((void *)&corwin, s, reg-(char*)corwin, len);
-      free(s);
-    } else if (strchr("abcirtTw:", c)) {
-      int end, class;
-
-      // Trim whitespace from "b ;" and ": blah " but only first space in "w x "
-
-      while (isspace(*line)) {
-        if (!strchr("btT", c) || *line != '\n') line++;
-        else break;
-      }
-append:
-      class = !strchr("btT:", c);
-      end = strcspn(line, class ? "\n" : "; \t\r\n\v\f");
-
-      if (!end) {
-        if (!strchr("btT", c)) break;
-        continue;
-      }
-
-      // Extend allocation to include new string. We use offsets instead of
-      // pointers so realloc() moving stuff doesn't break things. Do it
-      // here instead of toybuf so there's no maximum size.
-      if (!corwin->arg1) corwin->arg1 = reg - (char*)corwin;
-      reg = extend_string((void *)&corwin, line, reg - (char *)corwin, end); 
-      line += end;
-
-      // Line continuation? (Two slightly different input methods, -e with
-      // embedded newline vs -f line by line. Must parse both correctly.)
-      if (class && line[-1] == '\\') {
-        reg[-2] = 0;
-        if (*line && line[1]) {
-          reg -= 2;
-          line++;
-          goto append;
-        } else corwin->hit++;
-      }
-
-    // Commands that take no arguments
-    } else if (!strchr("{dDgGhHlnNpPqx=", c)) break;
-  }
-
-brand:
-  // Reminisce about chestnut trees.
-  error_exit("bad pattern '%s'@%ld (%c)", errstart, line-errstart+1, *line);
-}
-
-void sed_main(void)
-{
-  struct arg_list *dworkin;
-  char **args = toys.optargs;
-
-  // Lie to autoconf when it asks stupid questions, so configure regexes
-  // that look for "GNU sed version %f" greater than some old buggy number
-  // don't fail us for not matching their narrow expectations.
-  if (toys.optflags & FLAG_version) {
-    xprintf("This is not GNU sed version 9.0\n");
-    return;
-  }
-
-  // Need a pattern. If no unicorns about, fight serpent and take its eye.
-  if (!TT.e && !TT.f) {
-    if (!*toys.optargs) error_exit("no pattern");
-    (TT.e = xzalloc(sizeof(struct arg_list)))->arg = *(args++);
-  }
-
-  // Option parsing infrastructure can't interlace "-e blah -f blah -e blah"
-  // so handle all -e, then all -f. (At least the behavior's consistent.)
-
-  for (dworkin = TT.e; dworkin; dworkin = dworkin->next)
-    jewel_of_judgement(&dworkin->arg, strlen(dworkin->arg));
-  for (dworkin = TT.f; dworkin; dworkin = dworkin->next)
-    do_lines(xopen(dworkin->arg, O_RDONLY), dworkin->arg, jewel_of_judgement);
-  dlist_terminate(TT.pattern);
-  if (TT.nextlen) error_exit("no }");  
-
-  TT.fdout = 1;
-  TT.remember = xstrdup("");
-
-  // Inflict pattern upon input files
-  loopfiles_rw(args, O_RDONLY, 0, 0, do_sed);
-
-  if (!(toys.optflags & FLAG_i)) walk_pattern(0, 0);
-
-  // todo: need to close fd when done for TOYBOX_FREE?
-}