add support for local variable declared with attribute 'close' and 'const' for Lua 5.4.

1 files changed, 0 insertions, 1584 deletions

diff --git a/src/lua-5.3/lstrlib.c b/src/lua-5.3/lstrlib.c
deleted file mode 100644
index b4bed7e..0000000
--- a/src/lua-5.3/lstrlib.c
+++ /dev/null
@@ -1,1584 +0,0 @@
-/*
-** $Id: lstrlib.c,v 1.254.1.1 2017/04/19 17:29:57 roberto Exp $
-** Standard library for string operations and pattern-matching
-** See Copyright Notice in lua.h
-*/
-
-#define lstrlib_c
-#define LUA_LIB
-
-#include "lprefix.h"
-
-
-#include <ctype.h>
-#include <float.h>
-#include <limits.h>
-#include <locale.h>
-#include <stddef.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#include "lua.h"
-
-#include "lauxlib.h"
-#include "lualib.h"
-
-
-/*
-** maximum number of captures that a pattern can do during
-** pattern-matching. This limit is arbitrary, but must fit in
-** an unsigned char.
-*/
-#if !defined(LUA_MAXCAPTURES)
-#define LUA_MAXCAPTURES         32
-#endif
-
-
-/* macro to 'unsign' a character */
-#define uchar(c)        ((unsigned char)(c))
-
-
-/*
-** Some sizes are better limited to fit in 'int', but must also fit in
-** 'size_t'. (We assume that 'lua_Integer' cannot be smaller than 'int'.)
-*/
-#define MAX_SIZET       ((size_t)(~(size_t)0))
-
-#define MAXSIZE  \
-        (sizeof(size_t) < sizeof(int) ? MAX_SIZET : (size_t)(INT_MAX))
-
-
-
-
-static int str_len (lua_State *L) {
-  size_t l;
-  luaL_checklstring(L, 1, &l);
-  lua_pushinteger(L, (lua_Integer)l);
-  return 1;
-}
-
-
-/* translate a relative string position: negative means back from end */
-static lua_Integer posrelat (lua_Integer pos, size_t len) {
-  if (pos >= 0) return pos;
-  else if (0u - (size_t)pos > len) return 0;
-  else return (lua_Integer)len + pos + 1;
-}
-
-
-static int str_sub (lua_State *L) {
-  size_t l;
-  const char *s = luaL_checklstring(L, 1, &l);
-  lua_Integer start = posrelat(luaL_checkinteger(L, 2), l);
-  lua_Integer end = posrelat(luaL_optinteger(L, 3, -1), l);
-  if (start < 1) start = 1;
-  if (end > (lua_Integer)l) end = l;
-  if (start <= end)
-    lua_pushlstring(L, s + start - 1, (size_t)(end - start) + 1);
-  else lua_pushliteral(L, "");
-  return 1;
-}
-
-
-static int str_reverse (lua_State *L) {
-  size_t l, i;
-  luaL_Buffer b;
-  const char *s = luaL_checklstring(L, 1, &l);
-  char *p = luaL_buffinitsize(L, &b, l);
-  for (i = 0; i < l; i++)
-    p[i] = s[l - i - 1];
-  luaL_pushresultsize(&b, l);
-  return 1;
-}
-
-
-static int str_lower (lua_State *L) {
-  size_t l;
-  size_t i;
-  luaL_Buffer b;
-  const char *s = luaL_checklstring(L, 1, &l);
-  char *p = luaL_buffinitsize(L, &b, l);
-  for (i=0; i<l; i++)
-    p[i] = tolower(uchar(s[i]));
-  luaL_pushresultsize(&b, l);
-  return 1;
-}
-
-
-static int str_upper (lua_State *L) {
-  size_t l;
-  size_t i;
-  luaL_Buffer b;
-  const char *s = luaL_checklstring(L, 1, &l);
-  char *p = luaL_buffinitsize(L, &b, l);
-  for (i=0; i<l; i++)
-    p[i] = toupper(uchar(s[i]));
-  luaL_pushresultsize(&b, l);
-  return 1;
-}
-
-
-static int str_rep (lua_State *L) {
-  size_t l, lsep;
-  const char *s = luaL_checklstring(L, 1, &l);
-  lua_Integer n = luaL_checkinteger(L, 2);
-  const char *sep = luaL_optlstring(L, 3, "", &lsep);
-  if (n <= 0) lua_pushliteral(L, "");
-  else if (l + lsep < l || l + lsep > MAXSIZE / n)  /* may overflow? */
-    return luaL_error(L, "resulting string too large");
-  else {
-    size_t totallen = (size_t)n * l + (size_t)(n - 1) * lsep;
-    luaL_Buffer b;
-    char *p = luaL_buffinitsize(L, &b, totallen);
-    while (n-- > 1) {  /* first n-1 copies (followed by separator) */
-      memcpy(p, s, l * sizeof(char)); p += l;
-      if (lsep > 0) {  /* empty 'memcpy' is not that cheap */
-        memcpy(p, sep, lsep * sizeof(char));
-        p += lsep;
-      }
-    }
-    memcpy(p, s, l * sizeof(char));  /* last copy (not followed by separator) */
-    luaL_pushresultsize(&b, totallen);
-  }
-  return 1;
-}
-
-
-static int str_byte (lua_State *L) {
-  size_t l;
-  const char *s = luaL_checklstring(L, 1, &l);
-  lua_Integer posi = posrelat(luaL_optinteger(L, 2, 1), l);
-  lua_Integer pose = posrelat(luaL_optinteger(L, 3, posi), l);
-  int n, i;
-  if (posi < 1) posi = 1;
-  if (pose > (lua_Integer)l) pose = l;
-  if (posi > pose) return 0;  /* empty interval; return no values */
-  if (pose - posi >= INT_MAX)  /* arithmetic overflow? */
-    return luaL_error(L, "string slice too long");
-  n = (int)(pose -  posi) + 1;
-  luaL_checkstack(L, n, "string slice too long");
-  for (i=0; i<n; i++)
-    lua_pushinteger(L, uchar(s[posi+i-1]));
-  return n;
-}
-
-
-static int str_char (lua_State *L) {
-  int n = lua_gettop(L);  /* number of arguments */
-  int i;
-  luaL_Buffer b;
-  char *p = luaL_buffinitsize(L, &b, n);
-  for (i=1; i<=n; i++) {
-    lua_Integer c = luaL_checkinteger(L, i);
-    luaL_argcheck(L, uchar(c) == c, i, "value out of range");
-    p[i - 1] = uchar(c);
-  }
-  luaL_pushresultsize(&b, n);
-  return 1;
-}
-
-
-static int writer (lua_State *L, const void *b, size_t size, void *B) {
-  (void)L;
-  luaL_addlstring((luaL_Buffer *) B, (const char *)b, size);
-  return 0;
-}
-
-
-static int str_dump (lua_State *L) {
-  luaL_Buffer b;
-  int strip = lua_toboolean(L, 2);
-  luaL_checktype(L, 1, LUA_TFUNCTION);
-  lua_settop(L, 1);
-  luaL_buffinit(L,&b);
-  if (lua_dump(L, writer, &b, strip) != 0)
-    return luaL_error(L, "unable to dump given function");
-  luaL_pushresult(&b);
-  return 1;
-}
-
-
-
-/*
-** {======================================================
-** PATTERN MATCHING
-** =======================================================
-*/
-
-
-#define CAP_UNFINISHED  (-1)
-#define CAP_POSITION    (-2)
-
-
-typedef struct MatchState {
-  const char *src_init;  /* init of source string */
-  const char *src_end;  /* end ('\0') of source string */
-  const char *p_end;  /* end ('\0') of pattern */
-  lua_State *L;
-  int matchdepth;  /* control for recursive depth (to avoid C stack overflow) */
-  unsigned char level;  /* total number of captures (finished or unfinished) */
-  struct {
-    const char *init;
-    ptrdiff_t len;
-  } capture[LUA_MAXCAPTURES];
-} MatchState;
-
-
-/* recursive function */
-static const char *match (MatchState *ms, const char *s, const char *p);
-
-
-/* maximum recursion depth for 'match' */
-#if !defined(MAXCCALLS)
-#define MAXCCALLS       200
-#endif
-
-
-#define L_ESC           '%'
-#define SPECIALS        "^$*+?.([%-"
-
-
-static int check_capture (MatchState *ms, int l) {
-  l -= '1';
-  if (l < 0 || l >= ms->level || ms->capture[l].len == CAP_UNFINISHED)
-    return luaL_error(ms->L, "invalid capture index %%%d", l + 1);
-  return l;
-}
-
-
-static int capture_to_close (MatchState *ms) {
-  int level = ms->level;
-  for (level--; level>=0; level--)
-    if (ms->capture[level].len == CAP_UNFINISHED) return level;
-  return luaL_error(ms->L, "invalid pattern capture");
-}
-
-
-static const char *classend (MatchState *ms, const char *p) {
-  switch (*p++) {
-    case L_ESC: {
-      if (p == ms->p_end)
-        luaL_error(ms->L, "malformed pattern (ends with '%%')");
-      return p+1;
-    }
-    case '[': {
-      if (*p == '^') p++;
-      do {  /* look for a ']' */
-        if (p == ms->p_end)
-          luaL_error(ms->L, "malformed pattern (missing ']')");
-        if (*(p++) == L_ESC && p < ms->p_end)
-          p++;  /* skip escapes (e.g. '%]') */
-      } while (*p != ']');
-      return p+1;
-    }
-    default: {
-      return p;
-    }
-  }
-}
-
-
-static int match_class (int c, int cl) {
-  int res;
-  switch (tolower(cl)) {
-    case 'a' : res = isalpha(c); break;
-    case 'c' : res = iscntrl(c); break;
-    case 'd' : res = isdigit(c); break;
-    case 'g' : res = isgraph(c); break;
-    case 'l' : res = islower(c); break;
-    case 'p' : res = ispunct(c); break;
-    case 's' : res = isspace(c); break;
-    case 'u' : res = isupper(c); break;
-    case 'w' : res = isalnum(c); break;
-    case 'x' : res = isxdigit(c); break;
-    case 'z' : res = (c == 0); break;  /* deprecated option */
-    default: return (cl == c);
-  }
-  return (islower(cl) ? res : !res);
-}
-
-
-static int matchbracketclass (int c, const char *p, const char *ec) {
-  int sig = 1;
-  if (*(p+1) == '^') {
-    sig = 0;
-    p++;  /* skip the '^' */
-  }
-  while (++p < ec) {
-    if (*p == L_ESC) {
-      p++;
-      if (match_class(c, uchar(*p)))
-        return sig;
-    }
-    else if ((*(p+1) == '-') && (p+2 < ec)) {
-      p+=2;
-      if (uchar(*(p-2)) <= c && c <= uchar(*p))
-        return sig;
-    }
-    else if (uchar(*p) == c) return sig;
-  }
-  return !sig;
-}
-
-
-static int singlematch (MatchState *ms, const char *s, const char *p,
-                        const char *ep) {
-  if (s >= ms->src_end)
-    return 0;
-  else {
-    int c = uchar(*s);
-    switch (*p) {
-      case '.': return 1;  /* matches any char */
-      case L_ESC: return match_class(c, uchar(*(p+1)));
-      case '[': return matchbracketclass(c, p, ep-1);
-      default:  return (uchar(*p) == c);
-    }
-  }
-}
-
-
-static const char *matchbalance (MatchState *ms, const char *s,
-                                   const char *p) {
-  if (p >= ms->p_end - 1)
-    luaL_error(ms->L, "malformed pattern (missing arguments to '%%b')");
-  if (*s != *p) return NULL;
-  else {
-    int b = *p;
-    int e = *(p+1);
-    int cont = 1;
-    while (++s < ms->src_end) {
-      if (*s == e) {
-        if (--cont == 0) return s+1;
-      }
-      else if (*s == b) cont++;
-    }
-  }
-  return NULL;  /* string ends out of balance */
-}
-
-
-static const char *max_expand (MatchState *ms, const char *s,
-                                 const char *p, const char *ep) {
-  ptrdiff_t i = 0;  /* counts maximum expand for item */
-  while (singlematch(ms, s + i, p, ep))
-    i++;
-  /* keeps trying to match with the maximum repetitions */
-  while (i>=0) {
-    const char *res = match(ms, (s+i), ep+1);
-    if (res) return res;
-    i--;  /* else didn't match; reduce 1 repetition to try again */
-  }
-  return NULL;
-}
-
-
-static const char *min_expand (MatchState *ms, const char *s,
-                                 const char *p, const char *ep) {
-  for (;;) {
-    const char *res = match(ms, s, ep+1);
-    if (res != NULL)
-      return res;
-    else if (singlematch(ms, s, p, ep))
-      s++;  /* try with one more repetition */
-    else return NULL;
-  }
-}
-
-
-static const char *start_capture (MatchState *ms, const char *s,
-                                    const char *p, int what) {
-  const char *res;
-  int level = ms->level;
-  if (level >= LUA_MAXCAPTURES) luaL_error(ms->L, "too many captures");
-  ms->capture[level].init = s;
-  ms->capture[level].len = what;
-  ms->level = level+1;
-  if ((res=match(ms, s, p)) == NULL)  /* match failed? */
-    ms->level--;  /* undo capture */
-  return res;
-}
-
-
-static const char *end_capture (MatchState *ms, const char *s,
-                                  const char *p) {
-  int l = capture_to_close(ms);
-  const char *res;
-  ms->capture[l].len = s - ms->capture[l].init;  /* close capture */
-  if ((res = match(ms, s, p)) == NULL)  /* match failed? */
-    ms->capture[l].len = CAP_UNFINISHED;  /* undo capture */
-  return res;
-}
-
-
-static const char *match_capture (MatchState *ms, const char *s, int l) {
-  size_t len;
-  l = check_capture(ms, l);
-  len = ms->capture[l].len;
-  if ((size_t)(ms->src_end-s) >= len &&
-      memcmp(ms->capture[l].init, s, len) == 0)
-    return s+len;
-  else return NULL;
-}
-
-
-static const char *match (MatchState *ms, const char *s, const char *p) {
-  if (ms->matchdepth-- == 0)
-    luaL_error(ms->L, "pattern too complex");
-  init: /* using goto's to optimize tail recursion */
-  if (p != ms->p_end) {  /* end of pattern? */
-    switch (*p) {
-      case '(': {  /* start capture */
-        if (*(p + 1) == ')')  /* position capture? */
-          s = start_capture(ms, s, p + 2, CAP_POSITION);
-        else
-          s = start_capture(ms, s, p + 1, CAP_UNFINISHED);
-        break;
-      }
-      case ')': {  /* end capture */
-        s = end_capture(ms, s, p + 1);
-        break;
-      }
-      case '$': {
-        if ((p + 1) != ms->p_end)  /* is the '$' the last char in pattern? */
-          goto dflt;  /* no; go to default */
-        s = (s == ms->src_end) ? s : NULL;  /* check end of string */
-        break;
-      }
-      case L_ESC: {  /* escaped sequences not in the format class[*+?-]? */
-        switch (*(p + 1)) {
-          case 'b': {  /* balanced string? */
-            s = matchbalance(ms, s, p + 2);
-            if (s != NULL) {
-              p += 4; goto init;  /* return match(ms, s, p + 4); */
-            }  /* else fail (s == NULL) */
-            break;
-          }
-          case 'f': {  /* frontier? */
-            const char *ep; char previous;
-            p += 2;
-            if (*p != '[')
-              luaL_error(ms->L, "missing '[' after '%%f' in pattern");
-            ep = classend(ms, p);  /* points to what is next */
-            previous = (s == ms->src_init) ? '\0' : *(s - 1);
-            if (!matchbracketclass(uchar(previous), p, ep - 1) &&
-               matchbracketclass(uchar(*s), p, ep - 1)) {
-              p = ep; goto init;  /* return match(ms, s, ep); */
-            }
-            s = NULL;  /* match failed */
-            break;
-          }
-          case '0': case '1': case '2': case '3':
-          case '4': case '5': case '6': case '7':
-          case '8': case '9': {  /* capture results (%0-%9)? */
-            s = match_capture(ms, s, uchar(*(p + 1)));
-            if (s != NULL) {
-              p += 2; goto init;  /* return match(ms, s, p + 2) */
-            }
-            break;
-          }
-          default: goto dflt;
-        }
-        break;
-      }
-      default: dflt: {  /* pattern class plus optional suffix */
-        const char *ep = classend(ms, p);  /* points to optional suffix */
-        /* does not match at least once? */
-        if (!singlematch(ms, s, p, ep)) {
-          if (*ep == '*' || *ep == '?' || *ep == '-') {  /* accept empty? */
-            p = ep + 1; goto init;  /* return match(ms, s, ep + 1); */
-          }
-          else  /* '+' or no suffix */
-            s = NULL;  /* fail */
-        }
-        else {  /* matched once */
-          switch (*ep) {  /* handle optional suffix */
-            case '?': {  /* optional */
-              const char *res;
-              if ((res = match(ms, s + 1, ep + 1)) != NULL)
-                s = res;
-              else {
-                p = ep + 1; goto init;  /* else return match(ms, s, ep + 1); */
-              }
-              break;
-            }
-            case '+':  /* 1 or more repetitions */
-              s++;  /* 1 match already done */
-              /* FALLTHROUGH */
-            case '*':  /* 0 or more repetitions */
-              s = max_expand(ms, s, p, ep);
-              break;
-            case '-':  /* 0 or more repetitions (minimum) */
-              s = min_expand(ms, s, p, ep);
-              break;
-            default:  /* no suffix */
-              s++; p = ep; goto init;  /* return match(ms, s + 1, ep); */
-          }
-        }
-        break;
-      }
-    }
-  }
-  ms->matchdepth++;
-  return s;
-}
-
-
-
-static const char *lmemfind (const char *s1, size_t l1,
-                               const char *s2, size_t l2) {
-  if (l2 == 0) return s1;  /* empty strings are everywhere */
-  else if (l2 > l1) return NULL;  /* avoids a negative 'l1' */
-  else {
-    const char *init;  /* to search for a '*s2' inside 's1' */
-    l2--;  /* 1st char will be checked by 'memchr' */
-    l1 = l1-l2;  /* 's2' cannot be found after that */
-    while (l1 > 0 && (init = (const char *)memchr(s1, *s2, l1)) != NULL) {
-      init++;   /* 1st char is already checked */
-      if (memcmp(init, s2+1, l2) == 0)
-        return init-1;
-      else {  /* correct 'l1' and 's1' to try again */
-        l1 -= init-s1;
-        s1 = init;
-      }
-    }
-    return NULL;  /* not found */
-  }
-}
-
-
-static void push_onecapture (MatchState *ms, int i, const char *s,
-                                                    const char *e) {
-  if (i >= ms->level) {
-    if (i == 0)  /* ms->level == 0, too */
-      lua_pushlstring(ms->L, s, e - s);  /* add whole match */
-    else
-      luaL_error(ms->L, "invalid capture index %%%d", i + 1);
-  }
-  else {
-    ptrdiff_t l = ms->capture[i].len;
-    if (l == CAP_UNFINISHED) luaL_error(ms->L, "unfinished capture");
-    if (l == CAP_POSITION)
-      lua_pushinteger(ms->L, (ms->capture[i].init - ms->src_init) + 1);
-    else
-      lua_pushlstring(ms->L, ms->capture[i].init, l);
-  }
-}
-
-
-static int push_captures (MatchState *ms, const char *s, const char *e) {
-  int i;
-  int nlevels = (ms->level == 0 && s) ? 1 : ms->level;
-  luaL_checkstack(ms->L, nlevels, "too many captures");
-  for (i = 0; i < nlevels; i++)
-    push_onecapture(ms, i, s, e);
-  return nlevels;  /* number of strings pushed */
-}
-
-
-/* check whether pattern has no special characters */
-static int nospecials (const char *p, size_t l) {
-  size_t upto = 0;
-  do {
-    if (strpbrk(p + upto, SPECIALS))
-      return 0;  /* pattern has a special character */
-    upto += strlen(p + upto) + 1;  /* may have more after \0 */
-  } while (upto <= l);
-  return 1;  /* no special chars found */
-}
-
-
-static void prepstate (MatchState *ms, lua_State *L,
-                       const char *s, size_t ls, const char *p, size_t lp) {
-  ms->L = L;
-  ms->matchdepth = MAXCCALLS;
-  ms->src_init = s;
-  ms->src_end = s + ls;
-  ms->p_end = p + lp;
-}
-
-
-static void reprepstate (MatchState *ms) {
-  ms->level = 0;
-  lua_assert(ms->matchdepth == MAXCCALLS);
-}
-
-
-static int str_find_aux (lua_State *L, int find) {
-  size_t ls, lp;
-  const char *s = luaL_checklstring(L, 1, &ls);
-  const char *p = luaL_checklstring(L, 2, &lp);
-  lua_Integer init = posrelat(luaL_optinteger(L, 3, 1), ls);
-  if (init < 1) init = 1;
-  else if (init > (lua_Integer)ls + 1) {  /* start after string's end? */
-    lua_pushnil(L);  /* cannot find anything */
-    return 1;
-  }
-  /* explicit request or no special characters? */
-  if (find && (lua_toboolean(L, 4) || nospecials(p, lp))) {
-    /* do a plain search */
-    const char *s2 = lmemfind(s + init - 1, ls - (size_t)init + 1, p, lp);
-    if (s2) {
-      lua_pushinteger(L, (s2 - s) + 1);
-      lua_pushinteger(L, (s2 - s) + lp);
-      return 2;
-    }
-  }
-  else {
-    MatchState ms;
-    const char *s1 = s + init - 1;
-    int anchor = (*p == '^');
-    if (anchor) {
-      p++; lp--;  /* skip anchor character */
-    }
-    prepstate(&ms, L, s, ls, p, lp);
-    do {
-      const char *res;
-      reprepstate(&ms);
-      if ((res=match(&ms, s1, p)) != NULL) {
-        if (find) {
-          lua_pushinteger(L, (s1 - s) + 1);  /* start */
-          lua_pushinteger(L, res - s);   /* end */
-          return push_captures(&ms, NULL, 0) + 2;
-        }
-        else
-          return push_captures(&ms, s1, res);
-      }
-    } while (s1++ < ms.src_end && !anchor);
-  }
-  lua_pushnil(L);  /* not found */
-  return 1;
-}
-
-
-static int str_find (lua_State *L) {
-  return str_find_aux(L, 1);
-}
-
-
-static int str_match (lua_State *L) {
-  return str_find_aux(L, 0);
-}
-
-
-/* state for 'gmatch' */
-typedef struct GMatchState {
-  const char *src;  /* current position */
-  const char *p;  /* pattern */
-  const char *lastmatch;  /* end of last match */
-  MatchState ms;  /* match state */
-} GMatchState;
-
-
-static int gmatch_aux (lua_State *L) {
-  GMatchState *gm = (GMatchState *)lua_touserdata(L, lua_upvalueindex(3));
-  const char *src;
-  gm->ms.L = L;
-  for (src = gm->src; src <= gm->ms.src_end; src++) {
-    const char *e;
-    reprepstate(&gm->ms);
-    if ((e = match(&gm->ms, src, gm->p)) != NULL && e != gm->lastmatch) {
-      gm->src = gm->lastmatch = e;
-      return push_captures(&gm->ms, src, e);
-    }
-  }
-  return 0;  /* not found */
-}
-
-
-static int gmatch (lua_State *L) {
-  size_t ls, lp;
-  const char *s = luaL_checklstring(L, 1, &ls);
-  const char *p = luaL_checklstring(L, 2, &lp);
-  GMatchState *gm;
-  lua_settop(L, 2);  /* keep them on closure to avoid being collected */
-  gm = (GMatchState *)lua_newuserdata(L, sizeof(GMatchState));
-  prepstate(&gm->ms, L, s, ls, p, lp);
-  gm->src = s; gm->p = p; gm->lastmatch = NULL;
-  lua_pushcclosure(L, gmatch_aux, 3);
-  return 1;
-}
-
-
-static void add_s (MatchState *ms, luaL_Buffer *b, const char *s,
-                                                   const char *e) {
-  size_t l, i;
-  lua_State *L = ms->L;
-  const char *news = lua_tolstring(L, 3, &l);
-  for (i = 0; i < l; i++) {
-    if (news[i] != L_ESC)
-      luaL_addchar(b, news[i]);
-    else {
-      i++;  /* skip ESC */
-      if (!isdigit(uchar(news[i]))) {
-        if (news[i] != L_ESC)
-          luaL_error(L, "invalid use of '%c' in replacement string", L_ESC);
-        luaL_addchar(b, news[i]);
-      }
-      else if (news[i] == '0')
-          luaL_addlstring(b, s, e - s);
-      else {
-        push_onecapture(ms, news[i] - '1', s, e);
-        luaL_tolstring(L, -1, NULL);  /* if number, convert it to string */
-        lua_remove(L, -2);  /* remove original value */
-        luaL_addvalue(b);  /* add capture to accumulated result */
-      }
-    }
-  }
-}
-
-
-static void add_value (MatchState *ms, luaL_Buffer *b, const char *s,
-                                       const char *e, int tr) {
-  lua_State *L = ms->L;
-  switch (tr) {
-    case LUA_TFUNCTION: {
-      int n;
-      lua_pushvalue(L, 3);
-      n = push_captures(ms, s, e);
-      lua_call(L, n, 1);
-      break;
-    }
-    case LUA_TTABLE: {
-      push_onecapture(ms, 0, s, e);
-      lua_gettable(L, 3);
-      break;
-    }
-    default: {  /* LUA_TNUMBER or LUA_TSTRING */
-      add_s(ms, b, s, e);
-      return;
-    }
-  }
-  if (!lua_toboolean(L, -1)) {  /* nil or false? */
-    lua_pop(L, 1);
-    lua_pushlstring(L, s, e - s);  /* keep original text */
-  }
-  else if (!lua_isstring(L, -1))
-    luaL_error(L, "invalid replacement value (a %s)", luaL_typename(L, -1));
-  luaL_addvalue(b);  /* add result to accumulator */
-}
-
-
-static int str_gsub (lua_State *L) {
-  size_t srcl, lp;
-  const char *src = luaL_checklstring(L, 1, &srcl);  /* subject */
-  const char *p = luaL_checklstring(L, 2, &lp);  /* pattern */
-  const char *lastmatch = NULL;  /* end of last match */
-  int tr = lua_type(L, 3);  /* replacement type */
-  lua_Integer max_s = luaL_optinteger(L, 4, srcl + 1);  /* max replacements */
-  int anchor = (*p == '^');
-  lua_Integer n = 0;  /* replacement count */
-  MatchState ms;
-  luaL_Buffer b;
-  luaL_argcheck(L, tr == LUA_TNUMBER || tr == LUA_TSTRING ||
-                   tr == LUA_TFUNCTION || tr == LUA_TTABLE, 3,
-                      "string/function/table expected");
-  luaL_buffinit(L, &b);
-  if (anchor) {
-    p++; lp--;  /* skip anchor character */
-  }
-  prepstate(&ms, L, src, srcl, p, lp);
-  while (n < max_s) {
-    const char *e;
-    reprepstate(&ms);  /* (re)prepare state for new match */
-    if ((e = match(&ms, src, p)) != NULL && e != lastmatch) {  /* match? */
-      n++;
-      add_value(&ms, &b, src, e, tr);  /* add replacement to buffer */
-      src = lastmatch = e;
-    }
-    else if (src < ms.src_end)  /* otherwise, skip one character */
-      luaL_addchar(&b, *src++);
-    else break;  /* end of subject */
-    if (anchor) break;
-  }
-  luaL_addlstring(&b, src, ms.src_end-src);
-  luaL_pushresult(&b);
-  lua_pushinteger(L, n);  /* number of substitutions */
-  return 2;
-}
-
-/* }====================================================== */
-
-
-
-/*
-** {======================================================
-** STRING FORMAT
-** =======================================================
-*/
-
-#if !defined(lua_number2strx)   /* { */
-
-/*
-** Hexadecimal floating-point formatter
-*/
-
-#include <math.h>
-
-#define SIZELENMOD      (sizeof(LUA_NUMBER_FRMLEN)/sizeof(char))
-
-
-/*
-** Number of bits that goes into the first digit. It can be any value
-** between 1 and 4; the following definition tries to align the number
-** to nibble boundaries by making what is left after that first digit a
-** multiple of 4.
-*/
-#define L_NBFD          ((l_mathlim(MANT_DIG) - 1)%4 + 1)
-
-
-/*
-** Add integer part of 'x' to buffer and return new 'x'
-*/
-static lua_Number adddigit (char *buff, int n, lua_Number x) {
-  lua_Number dd = l_mathop(floor)(x);  /* get integer part from 'x' */
-  int d = (int)dd;
-  buff[n] = (d < 10 ? d + '0' : d - 10 + 'a');  /* add to buffer */
-  return x - dd;  /* return what is left */
-}
-
-
-static int num2straux (char *buff, int sz, lua_Number x) {
-  /* if 'inf' or 'NaN', format it like '%g' */
-  if (x != x || x == (lua_Number)HUGE_VAL || x == -(lua_Number)HUGE_VAL)
-    return l_sprintf(buff, sz, LUA_NUMBER_FMT, (LUAI_UACNUMBER)x);
-  else if (x == 0) {  /* can be -0... */
-    /* create "0" or "-0" followed by exponent */
-    return l_sprintf(buff, sz, LUA_NUMBER_FMT "x0p+0", (LUAI_UACNUMBER)x);
-  }
-  else {
-    int e;
-    lua_Number m = l_mathop(frexp)(x, &e);  /* 'x' fraction and exponent */
-    int n = 0;  /* character count */
-    if (m < 0) {  /* is number negative? */
-      buff[n++] = '-';  /* add signal */
-      m = -m;  /* make it positive */
-    }
-    buff[n++] = '0'; buff[n++] = 'x';  /* add "0x" */
-    m = adddigit(buff, n++, m * (1 << L_NBFD));  /* add first digit */
-    e -= L_NBFD;  /* this digit goes before the radix point */
-    if (m > 0) {  /* more digits? */
-      buff[n++] = lua_getlocaledecpoint();  /* add radix point */
-      do {  /* add as many digits as needed */
-        m = adddigit(buff, n++, m * 16);
-      } while (m > 0);
-    }
-    n += l_sprintf(buff + n, sz - n, "p%+d", e);  /* add exponent */
-    lua_assert(n < sz);
-    return n;
-  }
-}
-
-
-static int lua_number2strx (lua_State *L, char *buff, int sz,
-                            const char *fmt, lua_Number x) {
-  int n = num2straux(buff, sz, x);
-  if (fmt[SIZELENMOD] == 'A') {
-    int i;
-    for (i = 0; i < n; i++)
-      buff[i] = toupper(uchar(buff[i]));
-  }
-  else if (fmt[SIZELENMOD] != 'a')
-    return luaL_error(L, "modifiers for format '%%a'/'%%A' not implemented");
-  return n;
-}
-
-#endif                          /* } */
-
-
-/*
-** Maximum size of each formatted item. This maximum size is produced
-** by format('%.99f', -maxfloat), and is equal to 99 + 3 ('-', '.',
-** and '\0') + number of decimal digits to represent maxfloat (which
-** is maximum exponent + 1). (99+3+1 then rounded to 120 for "extra
-** expenses", such as locale-dependent stuff)
-*/
-#define MAX_ITEM        (120 + l_mathlim(MAX_10_EXP))
-
-
-/* valid flags in a format specification */
-#define FLAGS   "-+ #0"
-
-/*
-** maximum size of each format specification (such as "%-099.99d")
-*/
-#define MAX_FORMAT      32
-
-
-static void addquoted (luaL_Buffer *b, const char *s, size_t len) {
-  luaL_addchar(b, '"');
-  while (len--) {
-    if (*s == '"' || *s == '\\' || *s == '\n') {
-      luaL_addchar(b, '\\');
-      luaL_addchar(b, *s);
-    }
-    else if (iscntrl(uchar(*s))) {
-      char buff[10];
-      if (!isdigit(uchar(*(s+1))))
-        l_sprintf(buff, sizeof(buff), "\\%d", (int)uchar(*s));
-      else
-        l_sprintf(buff, sizeof(buff), "\\%03d", (int)uchar(*s));
-      luaL_addstring(b, buff);
-    }
-    else
-      luaL_addchar(b, *s);
-    s++;
-  }
-  luaL_addchar(b, '"');
-}
-
-
-/*
-** Ensures the 'buff' string uses a dot as the radix character.
-*/
-static void checkdp (char *buff, int nb) {
-  if (memchr(buff, '.', nb) == NULL) {  /* no dot? */
-    char point = lua_getlocaledecpoint();  /* try locale point */
-    char *ppoint = (char *)memchr(buff, point, nb);
-    if (ppoint) *ppoint = '.';  /* change it to a dot */
-  }
-}
-
-
-static void addliteral (lua_State *L, luaL_Buffer *b, int arg) {
-  switch (lua_type(L, arg)) {
-    case LUA_TSTRING: {
-      size_t len;
-      const char *s = lua_tolstring(L, arg, &len);
-      addquoted(b, s, len);
-      break;
-    }
-    case LUA_TNUMBER: {
-      char *buff = luaL_prepbuffsize(b, MAX_ITEM);
-      int nb;
-      if (!lua_isinteger(L, arg)) {  /* float? */
-        lua_Number n = lua_tonumber(L, arg);  /* write as hexa ('%a') */
-        nb = lua_number2strx(L, buff, MAX_ITEM, "%" LUA_NUMBER_FRMLEN "a", n);
-        checkdp(buff, nb);  /* ensure it uses a dot */
-      }
-      else {  /* integers */
-        lua_Integer n = lua_tointeger(L, arg);
-        const char *format = (n == LUA_MININTEGER)  /* corner case? */
-                           ? "0x%" LUA_INTEGER_FRMLEN "x"  /* use hexa */
-                           : LUA_INTEGER_FMT;  /* else use default format */
-        nb = l_sprintf(buff, MAX_ITEM, format, (LUAI_UACINT)n);
-      }
-      luaL_addsize(b, nb);
-      break;
-    }
-    case LUA_TNIL: case LUA_TBOOLEAN: {
-      luaL_tolstring(L, arg, NULL);
-      luaL_addvalue(b);
-      break;
-    }
-    default: {
-      luaL_argerror(L, arg, "value has no literal form");
-    }
-  }
-}
-
-
-static const char *scanformat (lua_State *L, const char *strfrmt, char *form) {
-  const char *p = strfrmt;
-  while (*p != '\0' && strchr(FLAGS, *p) != NULL) p++;  /* skip flags */
-  if ((size_t)(p - strfrmt) >= sizeof(FLAGS)/sizeof(char))
-    luaL_error(L, "invalid format (repeated flags)");
-  if (isdigit(uchar(*p))) p++;  /* skip width */
-  if (isdigit(uchar(*p))) p++;  /* (2 digits at most) */
-  if (*p == '.') {
-    p++;
-    if (isdigit(uchar(*p))) p++;  /* skip precision */
-    if (isdigit(uchar(*p))) p++;  /* (2 digits at most) */
-  }
-  if (isdigit(uchar(*p)))
-    luaL_error(L, "invalid format (width or precision too long)");
-  *(form++) = '%';
-  memcpy(form, strfrmt, ((p - strfrmt) + 1) * sizeof(char));
-  form += (p - strfrmt) + 1;
-  *form = '\0';
-  return p;
-}
-
-
-/*
-** add length modifier into formats
-*/
-static void addlenmod (char *form, const char *lenmod) {
-  size_t l = strlen(form);
-  size_t lm = strlen(lenmod);
-  char spec = form[l - 1];
-  strcpy(form + l - 1, lenmod);
-  form[l + lm - 1] = spec;
-  form[l + lm] = '\0';
-}
-
-
-static int str_format (lua_State *L) {
-  int top = lua_gettop(L);
-  int arg = 1;
-  size_t sfl;
-  const char *strfrmt = luaL_checklstring(L, arg, &sfl);
-  const char *strfrmt_end = strfrmt+sfl;
-  luaL_Buffer b;
-  luaL_buffinit(L, &b);
-  while (strfrmt < strfrmt_end) {
-    if (*strfrmt != L_ESC)
-      luaL_addchar(&b, *strfrmt++);
-    else if (*++strfrmt == L_ESC)
-      luaL_addchar(&b, *strfrmt++);  /* %% */
-    else { /* format item */
-      char form[MAX_FORMAT];  /* to store the format ('%...') */
-      char *buff = luaL_prepbuffsize(&b, MAX_ITEM);  /* to put formatted item */
-      int nb = 0;  /* number of bytes in added item */
-      if (++arg > top)
-        luaL_argerror(L, arg, "no value");
-      strfrmt = scanformat(L, strfrmt, form);
-      switch (*strfrmt++) {
-        case 'c': {
-          nb = l_sprintf(buff, MAX_ITEM, form, (int)luaL_checkinteger(L, arg));
-          break;
-        }
-        case 'd': case 'i':
-        case 'o': case 'u': case 'x': case 'X': {
-          lua_Integer n = luaL_checkinteger(L, arg);
-          addlenmod(form, LUA_INTEGER_FRMLEN);
-          nb = l_sprintf(buff, MAX_ITEM, form, (LUAI_UACINT)n);
-          break;
-        }
-        case 'a': case 'A':
-          addlenmod(form, LUA_NUMBER_FRMLEN);
-          nb = lua_number2strx(L, buff, MAX_ITEM, form,
-                                  luaL_checknumber(L, arg));
-          break;
-        case 'e': case 'E': case 'f':
-        case 'g': case 'G': {
-          lua_Number n = luaL_checknumber(L, arg);
-          addlenmod(form, LUA_NUMBER_FRMLEN);
-          nb = l_sprintf(buff, MAX_ITEM, form, (LUAI_UACNUMBER)n);
-          break;
-        }
-        case 'q': {
-          addliteral(L, &b, arg);
-          break;
-        }
-        case 's': {
-          size_t l;
-          const char *s = luaL_tolstring(L, arg, &l);
-          if (form[2] == '\0')  /* no modifiers? */
-            luaL_addvalue(&b);  /* keep entire string */
-          else {
-            luaL_argcheck(L, l == strlen(s), arg, "string contains zeros");
-            if (!strchr(form, '.') && l >= 100) {
-              /* no precision and string is too long to be formatted */
-              luaL_addvalue(&b);  /* keep entire string */
-            }
-            else {  /* format the string into 'buff' */
-              nb = l_sprintf(buff, MAX_ITEM, form, s);
-              lua_pop(L, 1);  /* remove result from 'luaL_tolstring' */
-            }
-          }
-          break;
-        }
-        default: {  /* also treat cases 'pnLlh' */
-          return luaL_error(L, "invalid option '%%%c' to 'format'",
-                               *(strfrmt - 1));
-        }
-      }
-      lua_assert(nb < MAX_ITEM);
-      luaL_addsize(&b, nb);
-    }
-  }
-  luaL_pushresult(&b);
-  return 1;
-}
-
-/* }====================================================== */
-
-
-/*
-** {======================================================
-** PACK/UNPACK
-** =======================================================
-*/
-
-
-/* value used for padding */
-#if !defined(LUAL_PACKPADBYTE)
-#define LUAL_PACKPADBYTE                0x00
-#endif
-
-/* maximum size for the binary representation of an integer */
-#define MAXINTSIZE      16
-
-/* number of bits in a character */
-#define NB      CHAR_BIT
-
-/* mask for one character (NB 1's) */
-#define MC      ((1 << NB) - 1)
-
-/* size of a lua_Integer */
-#define SZINT   ((int)sizeof(lua_Integer))
-
-
-/* dummy union to get native endianness */
-static const union {
-  int dummy;
-  char little;  /* true iff machine is little endian */
-} nativeendian = {1};
-
-
-/* dummy structure to get native alignment requirements */
-struct cD {
-  char c;
-  union { double d; void *p; lua_Integer i; lua_Number n; } u;
-};
-
-#define MAXALIGN        (offsetof(struct cD, u))
-
-
-/*
-** Union for serializing floats
-*/
-typedef union Ftypes {
-  float f;
-  double d;
-  lua_Number n;
-  char buff[5 * sizeof(lua_Number)];  /* enough for any float type */
-} Ftypes;
-
-
-/*
-** information to pack/unpack stuff
-*/
-typedef struct Header {
-  lua_State *L;
-  int islittle;
-  int maxalign;
-} Header;
-
-
-/*
-** options for pack/unpack
-*/
-typedef enum KOption {
-  Kint,         /* signed integers */
-  Kuint,        /* unsigned integers */
-  Kfloat,       /* floating-point numbers */
-  Kchar,        /* fixed-length strings */
-  Kstring,      /* strings with prefixed length */
-  Kzstr,        /* zero-terminated strings */
-  Kpadding,     /* padding */
-  Kpaddalign,   /* padding for alignment */
-  Knop          /* no-op (configuration or spaces) */
-} KOption;
-
-
-/*
-** Read an integer numeral from string 'fmt' or return 'df' if
-** there is no numeral
-*/
-static int digit (int c) { return '0' <= c && c <= '9'; }
-
-static int getnum (const char **fmt, int df) {
-  if (!digit(**fmt))  /* no number? */
-    return df;  /* return default value */
-  else {
-    int a = 0;
-    do {
-      a = a*10 + (*((*fmt)++) - '0');
-    } while (digit(**fmt) && a <= ((int)MAXSIZE - 9)/10);
-    return a;
-  }
-}
-
-
-/*
-** Read an integer numeral and raises an error if it is larger
-** than the maximum size for integers.
-*/
-static int getnumlimit (Header *h, const char **fmt, int df) {
-  int sz = getnum(fmt, df);
-  if (sz > MAXINTSIZE || sz <= 0)
-    return luaL_error(h->L, "integral size (%d) out of limits [1,%d]",
-                            sz, MAXINTSIZE);
-  return sz;
-}
-
-
-/*
-** Initialize Header
-*/
-static void initheader (lua_State *L, Header *h) {
-  h->L = L;
-  h->islittle = nativeendian.little;
-  h->maxalign = 1;
-}
-
-
-/*
-** Read and classify next option. 'size' is filled with option's size.
-*/
-static KOption getoption (Header *h, const char **fmt, int *size) {
-  int opt = *((*fmt)++);
-  *size = 0;  /* default */
-  switch (opt) {
-    case 'b': *size = sizeof(char); return Kint;
-    case 'B': *size = sizeof(char); return Kuint;
-    case 'h': *size = sizeof(short); return Kint;
-    case 'H': *size = sizeof(short); return Kuint;
-    case 'l': *size = sizeof(long); return Kint;
-    case 'L': *size = sizeof(long); return Kuint;
-    case 'j': *size = sizeof(lua_Integer); return Kint;
-    case 'J': *size = sizeof(lua_Integer); return Kuint;
-    case 'T': *size = sizeof(size_t); return Kuint;
-    case 'f': *size = sizeof(float); return Kfloat;
-    case 'd': *size = sizeof(double); return Kfloat;
-    case 'n': *size = sizeof(lua_Number); return Kfloat;
-    case 'i': *size = getnumlimit(h, fmt, sizeof(int)); return Kint;
-    case 'I': *size = getnumlimit(h, fmt, sizeof(int)); return Kuint;
-    case 's': *size = getnumlimit(h, fmt, sizeof(size_t)); return Kstring;
-    case 'c':
-      *size = getnum(fmt, -1);
-      if (*size == -1)
-        luaL_error(h->L, "missing size for format option 'c'");
-      return Kchar;
-    case 'z': return Kzstr;
-    case 'x': *size = 1; return Kpadding;
-    case 'X': return Kpaddalign;
-    case ' ': break;
-    case '<': h->islittle = 1; break;
-    case '>': h->islittle = 0; break;
-    case '=': h->islittle = nativeendian.little; break;
-    case '!': h->maxalign = getnumlimit(h, fmt, MAXALIGN); break;
-    default: luaL_error(h->L, "invalid format option '%c'", opt);
-  }
-  return Knop;
-}
-
-
-/*
-** Read, classify, and fill other details about the next option.
-** 'psize' is filled with option's size, 'notoalign' with its
-** alignment requirements.
-** Local variable 'size' gets the size to be aligned. (Kpadal option
-** always gets its full alignment, other options are limited by
-** the maximum alignment ('maxalign'). Kchar option needs no alignment
-** despite its size.
-*/
-static KOption getdetails (Header *h, size_t totalsize,
-                           const char **fmt, int *psize, int *ntoalign) {
-  KOption opt = getoption(h, fmt, psize);
-  int align = *psize;  /* usually, alignment follows size */
-  if (opt == Kpaddalign) {  /* 'X' gets alignment from following option */
-    if (**fmt == '\0' || getoption(h, fmt, &align) == Kchar || align == 0)
-      luaL_argerror(h->L, 1, "invalid next option for option 'X'");
-  }
-  if (align <= 1 || opt == Kchar)  /* need no alignment? */
-    *ntoalign = 0;
-  else {
-    if (align > h->maxalign)  /* enforce maximum alignment */
-      align = h->maxalign;
-    if ((align & (align - 1)) != 0)  /* is 'align' not a power of 2? */
-      luaL_argerror(h->L, 1, "format asks for alignment not power of 2");
-    *ntoalign = (align - (int)(totalsize & (align - 1))) & (align - 1);
-  }
-  return opt;
-}
-
-
-/*
-** Pack integer 'n' with 'size' bytes and 'islittle' endianness.
-** The final 'if' handles the case when 'size' is larger than
-** the size of a Lua integer, correcting the extra sign-extension
-** bytes if necessary (by default they would be zeros).
-*/
-static void packint (luaL_Buffer *b, lua_Unsigned n,
-                     int islittle, int size, int neg) {
-  char *buff = luaL_prepbuffsize(b, size);
-  int i;
-  buff[islittle ? 0 : size - 1] = (char)(n & MC);  /* first byte */
-  for (i = 1; i < size; i++) {
-    n >>= NB;
-    buff[islittle ? i : size - 1 - i] = (char)(n & MC);
-  }
-  if (neg && size > SZINT) {  /* negative number need sign extension? */
-    for (i = SZINT; i < size; i++)  /* correct extra bytes */
-      buff[islittle ? i : size - 1 - i] = (char)MC;
-  }
-  luaL_addsize(b, size);  /* add result to buffer */
-}
-
-
-/*
-** Copy 'size' bytes from 'src' to 'dest', correcting endianness if
-** given 'islittle' is different from native endianness.
-*/
-static void copywithendian (volatile char *dest, volatile const char *src,
-                            int size, int islittle) {
-  if (islittle == nativeendian.little) {
-    while (size-- != 0)
-      *(dest++) = *(src++);
-  }
-  else {
-    dest += size - 1;
-    while (size-- != 0)
-      *(dest--) = *(src++);
-  }
-}
-
-
-static int str_pack (lua_State *L) {
-  luaL_Buffer b;
-  Header h;
-  const char *fmt = luaL_checkstring(L, 1);  /* format string */
-  int arg = 1;  /* current argument to pack */
-  size_t totalsize = 0;  /* accumulate total size of result */
-  initheader(L, &h);
-  lua_pushnil(L);  /* mark to separate arguments from string buffer */
-  luaL_buffinit(L, &b);
-  while (*fmt != '\0') {
-    int size, ntoalign;
-    KOption opt = getdetails(&h, totalsize, &fmt, &size, &ntoalign);
-    totalsize += ntoalign + size;
-    while (ntoalign-- > 0)
-     luaL_addchar(&b, LUAL_PACKPADBYTE);  /* fill alignment */
-    arg++;
-    switch (opt) {
-      case Kint: {  /* signed integers */
-        lua_Integer n = luaL_checkinteger(L, arg);
-        if (size < SZINT) {  /* need overflow check? */
-          lua_Integer lim = (lua_Integer)1 << ((size * NB) - 1);
-          luaL_argcheck(L, -lim <= n && n < lim, arg, "integer overflow");
-        }
-        packint(&b, (lua_Unsigned)n, h.islittle, size, (n < 0));
-        break;
-      }
-      case Kuint: {  /* unsigned integers */
-        lua_Integer n = luaL_checkinteger(L, arg);
-        if (size < SZINT)  /* need overflow check? */
-          luaL_argcheck(L, (lua_Unsigned)n < ((lua_Unsigned)1 << (size * NB)),
-                           arg, "unsigned overflow");
-        packint(&b, (lua_Unsigned)n, h.islittle, size, 0);
-        break;
-      }
-      case Kfloat: {  /* floating-point options */
-        volatile Ftypes u;
-        char *buff = luaL_prepbuffsize(&b, size);
-        lua_Number n = luaL_checknumber(L, arg);  /* get argument */
-        if (size == sizeof(u.f)) u.f = (float)n;  /* copy it into 'u' */
-        else if (size == sizeof(u.d)) u.d = (double)n;
-        else u.n = n;
-        /* move 'u' to final result, correcting endianness if needed */
-        copywithendian(buff, u.buff, size, h.islittle);
-        luaL_addsize(&b, size);
-        break;
-      }
-      case Kchar: {  /* fixed-size string */
-        size_t len;
-        const char *s = luaL_checklstring(L, arg, &len);
-        luaL_argcheck(L, len <= (size_t)size, arg,
-                         "string longer than given size");
-        luaL_addlstring(&b, s, len);  /* add string */
-        while (len++ < (size_t)size)  /* pad extra space */
-          luaL_addchar(&b, LUAL_PACKPADBYTE);
-        break;
-      }
-      case Kstring: {  /* strings with length count */
-        size_t len;
-        const char *s = luaL_checklstring(L, arg, &len);
-        luaL_argcheck(L, size >= (int)sizeof(size_t) ||
-                         len < ((size_t)1 << (size * NB)),
-                         arg, "string length does not fit in given size");
-        packint(&b, (lua_Unsigned)len, h.islittle, size, 0);  /* pack length */
-        luaL_addlstring(&b, s, len);
-        totalsize += len;
-        break;
-      }
-      case Kzstr: {  /* zero-terminated string */
-        size_t len;
-        const char *s = luaL_checklstring(L, arg, &len);
-        luaL_argcheck(L, strlen(s) == len, arg, "string contains zeros");
-        luaL_addlstring(&b, s, len);
-        luaL_addchar(&b, '\0');  /* add zero at the end */
-        totalsize += len + 1;
-        break;
-      }
-      case Kpadding: luaL_addchar(&b, LUAL_PACKPADBYTE);  /* FALLTHROUGH */
-      case Kpaddalign: case Knop:
-        arg--;  /* undo increment */
-        break;
-    }
-  }
-  luaL_pushresult(&b);
-  return 1;
-}
-
-
-static int str_packsize (lua_State *L) {
-  Header h;
-  const char *fmt = luaL_checkstring(L, 1);  /* format string */
-  size_t totalsize = 0;  /* accumulate total size of result */
-  initheader(L, &h);
-  while (*fmt != '\0') {
-    int size, ntoalign;
-    KOption opt = getdetails(&h, totalsize, &fmt, &size, &ntoalign);
-    size += ntoalign;  /* total space used by option */
-    luaL_argcheck(L, totalsize <= MAXSIZE - size, 1,
-                     "format result too large");
-    totalsize += size;
-    switch (opt) {
-      case Kstring:  /* strings with length count */
-      case Kzstr:    /* zero-terminated string */
-        luaL_argerror(L, 1, "variable-length format");
-        /* call never return, but to avoid warnings: *//* FALLTHROUGH */
-      default:  break;
-    }
-  }
-  lua_pushinteger(L, (lua_Integer)totalsize);
-  return 1;
-}
-
-
-/*
-** Unpack an integer with 'size' bytes and 'islittle' endianness.
-** If size is smaller than the size of a Lua integer and integer
-** is signed, must do sign extension (propagating the sign to the
-** higher bits); if size is larger than the size of a Lua integer,
-** it must check the unread bytes to see whether they do not cause an
-** overflow.
-*/
-static lua_Integer unpackint (lua_State *L, const char *str,
-                              int islittle, int size, int issigned) {
-  lua_Unsigned res = 0;
-  int i;
-  int limit = (size  <= SZINT) ? size : SZINT;
-  for (i = limit - 1; i >= 0; i--) {
-    res <<= NB;
-    res |= (lua_Unsigned)(unsigned char)str[islittle ? i : size - 1 - i];
-  }
-  if (size < SZINT) {  /* real size smaller than lua_Integer? */
-    if (issigned) {  /* needs sign extension? */
-      lua_Unsigned mask = (lua_Unsigned)1 << (size*NB - 1);
-      res = ((res ^ mask) - mask);  /* do sign extension */
-    }
-  }
-  else if (size > SZINT) {  /* must check unread bytes */
-    int mask = (!issigned || (lua_Integer)res >= 0) ? 0 : MC;
-    for (i = limit; i < size; i++) {
-      if ((unsigned char)str[islittle ? i : size - 1 - i] != mask)
-        luaL_error(L, "%d-byte integer does not fit into Lua Integer", size);
-    }
-  }
-  return (lua_Integer)res;
-}
-
-
-static int str_unpack (lua_State *L) {
-  Header h;
-  const char *fmt = luaL_checkstring(L, 1);
-  size_t ld;
-  const char *data = luaL_checklstring(L, 2, &ld);
-  size_t pos = (size_t)posrelat(luaL_optinteger(L, 3, 1), ld) - 1;
-  int n = 0;  /* number of results */
-  luaL_argcheck(L, pos <= ld, 3, "initial position out of string");
-  initheader(L, &h);
-  while (*fmt != '\0') {
-    int size, ntoalign;
-    KOption opt = getdetails(&h, pos, &fmt, &size, &ntoalign);
-    if ((size_t)ntoalign + size > ~pos || pos + ntoalign + size > ld)
-      luaL_argerror(L, 2, "data string too short");
-    pos += ntoalign;  /* skip alignment */
-    /* stack space for item + next position */
-    luaL_checkstack(L, 2, "too many results");
-    n++;
-    switch (opt) {
-      case Kint:
-      case Kuint: {
-        lua_Integer res = unpackint(L, data + pos, h.islittle, size,
-                                       (opt == Kint));
-        lua_pushinteger(L, res);
-        break;
-      }
-      case Kfloat: {
-        volatile Ftypes u;
-        lua_Number num;
-        copywithendian(u.buff, data + pos, size, h.islittle);
-        if (size == sizeof(u.f)) num = (lua_Number)u.f;
-        else if (size == sizeof(u.d)) num = (lua_Number)u.d;
-        else num = u.n;
-        lua_pushnumber(L, num);
-        break;
-      }
-      case Kchar: {
-        lua_pushlstring(L, data + pos, size);
-        break;
-      }
-      case Kstring: {
-        size_t len = (size_t)unpackint(L, data + pos, h.islittle, size, 0);
-        luaL_argcheck(L, pos + len + size <= ld, 2, "data string too short");
-        lua_pushlstring(L, data + pos + size, len);
-        pos += len;  /* skip string */
-        break;
-      }
-      case Kzstr: {
-        size_t len = (int)strlen(data + pos);
-        lua_pushlstring(L, data + pos, len);
-        pos += len + 1;  /* skip string plus final '\0' */
-        break;
-      }
-      case Kpaddalign: case Kpadding: case Knop:
-        n--;  /* undo increment */
-        break;
-    }
-    pos += size;
-  }
-  lua_pushinteger(L, pos + 1);  /* next position */
-  return n + 1;
-}
-
-/* }====================================================== */
-
-
-static const luaL_Reg strlib[] = {
-  {"byte", str_byte},
-  {"char", str_char},
-  {"dump", str_dump},
-  {"find", str_find},
-  {"format", str_format},
-  {"gmatch", gmatch},
-  {"gsub", str_gsub},
-  {"len", str_len},
-  {"lower", str_lower},
-  {"match", str_match},
-  {"rep", str_rep},
-  {"reverse", str_reverse},
-  {"sub", str_sub},
-  {"upper", str_upper},
-  {"pack", str_pack},
-  {"packsize", str_packsize},
-  {"unpack", str_unpack},
-  {NULL, NULL}
-};
-
-
-static void createmetatable (lua_State *L) {
-  lua_createtable(L, 0, 1);  /* table to be metatable for strings */
-  lua_pushliteral(L, "");  /* dummy string */
-  lua_pushvalue(L, -2);  /* copy table */
-  lua_setmetatable(L, -2);  /* set table as metatable for strings */
-  lua_pop(L, 1);  /* pop dummy string */
-  lua_pushvalue(L, -2);  /* get string library */
-  lua_setfield(L, -2, "__index");  /* metatable.__index = string */
-  lua_pop(L, 1);  /* pop metatable */
-}
-
-
-/*
-** Open string library
-*/
-LUAMOD_API int luaopen_string (lua_State *L) {
-  luaL_newlib(L, strlib);
-  createmetatable(L);
-  return 1;
-}
-