misc/liblua/lobject.c
author nemo
Sun, 14 Mar 2010 16:56:02 +0000
changeset 2988 42fa7fbee89a
parent 2812 0a24853de796
permissions -rw-r--r--
New multiplayer graphic
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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/*
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** $Id: lobject.c,v 2.22.1.1 2007/12/27 13:02:25 roberto Exp $
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** Some generic functions over Lua objects
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** See Copyright Notice in lua.h
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*/
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#include <ctype.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#define lobject_c
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#define LUA_CORE
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#include "lua.h"
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#include "ldo.h"
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#include "lmem.h"
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#include "lobject.h"
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#include "lstate.h"
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#include "lstring.h"
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#include "lvm.h"
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const TValue luaO_nilobject_ = {{NULL}, LUA_TNIL};
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/*
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** converts an integer to a "floating point byte", represented as
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** (eeeeexxx), where the real value is (1xxx) * 2^(eeeee - 1) if
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** eeeee != 0 and (xxx) otherwise.
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*/
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int luaO_int2fb (unsigned int x) {
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  int e = 0;  /* expoent */
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  while (x >= 16) {
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    x = (x+1) >> 1;
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    e++;
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  }
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  if (x < 8) return x;
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  else return ((e+1) << 3) | (cast_int(x) - 8);
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}
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/* converts back */
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int luaO_fb2int (int x) {
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  int e = (x >> 3) & 31;
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  if (e == 0) return x;
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  else return ((x & 7)+8) << (e - 1);
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}
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int luaO_log2 (unsigned int x) {
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  static const lu_byte log_2[256] = {
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    0,1,2,2,3,3,3,3,4,4,4,4,4,4,4,4,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
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    6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
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    7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
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    7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
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    8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
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    8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
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    8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
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    8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8
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  };
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  int l = -1;
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  while (x >= 256) { l += 8; x >>= 8; }
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  return l + log_2[x];
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}
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int luaO_rawequalObj (const TValue *t1, const TValue *t2) {
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  if (ttype(t1) != ttype(t2)) return 0;
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  else switch (ttype(t1)) {
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    case LUA_TNIL:
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      return 1;
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    case LUA_TNUMBER:
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      return luai_numeq(nvalue(t1), nvalue(t2));
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    case LUA_TBOOLEAN:
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      return bvalue(t1) == bvalue(t2);  /* boolean true must be 1 !! */
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    case LUA_TLIGHTUSERDATA:
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      return pvalue(t1) == pvalue(t2);
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    default:
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      lua_assert(iscollectable(t1));
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      return gcvalue(t1) == gcvalue(t2);
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  }
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}
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int luaO_str2d (const char *s, lua_Number *result) {
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  char *endptr;
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  *result = lua_str2number(s, &endptr);
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  if (endptr == s) return 0;  /* conversion failed */
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  if (*endptr == 'x' || *endptr == 'X')  /* maybe an hexadecimal constant? */
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    *result = cast_num(strtoul(s, &endptr, 16));
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  if (*endptr == '\0') return 1;  /* most common case */
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  while (isspace(cast(unsigned char, *endptr))) endptr++;
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  if (*endptr != '\0') return 0;  /* invalid trailing characters? */
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  return 1;
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}
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static void pushstr (lua_State *L, const char *str) {
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  setsvalue2s(L, L->top, luaS_new(L, str));
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  incr_top(L);
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}
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/* this function handles only `%d', `%c', %f, %p, and `%s' formats */
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const char *luaO_pushvfstring (lua_State *L, const char *fmt, va_list argp) {
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  int n = 1;
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  pushstr(L, "");
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  for (;;) {
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    const char *e = strchr(fmt, '%');
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    if (e == NULL) break;
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    setsvalue2s(L, L->top, luaS_newlstr(L, fmt, e-fmt));
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    incr_top(L);
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    switch (*(e+1)) {
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      case 's': {
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        const char *s = va_arg(argp, char *);
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        if (s == NULL) s = "(null)";
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        pushstr(L, s);
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        break;
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      }
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      case 'c': {
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        char buff[2];
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        buff[0] = cast(char, va_arg(argp, int));
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        buff[1] = '\0';
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        pushstr(L, buff);
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        break;
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      }
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      case 'd': {
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        setnvalue(L->top, cast_num(va_arg(argp, int)));
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        incr_top(L);
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        break;
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      }
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      case 'f': {
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        setnvalue(L->top, cast_num(va_arg(argp, l_uacNumber)));
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        incr_top(L);
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        break;
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      }
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      case 'p': {
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        char buff[4*sizeof(void *) + 8]; /* should be enough space for a `%p' */
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        sprintf(buff, "%p", va_arg(argp, void *));
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        pushstr(L, buff);
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        break;
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      }
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      case '%': {
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        pushstr(L, "%");
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        break;
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      }
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      default: {
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        char buff[3];
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        buff[0] = '%';
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        buff[1] = *(e+1);
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        buff[2] = '\0';
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        pushstr(L, buff);
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        break;
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      }
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    }
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    n += 2;
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    fmt = e+2;
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  }
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  pushstr(L, fmt);
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  luaV_concat(L, n+1, cast_int(L->top - L->base) - 1);
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  L->top -= n;
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  return svalue(L->top - 1);
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}
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const char *luaO_pushfstring (lua_State *L, const char *fmt, ...) {
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  const char *msg;
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  va_list argp;
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  va_start(argp, fmt);
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  msg = luaO_pushvfstring(L, fmt, argp);
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  va_end(argp);
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  return msg;
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}
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void luaO_chunkid (char *out, const char *source, size_t bufflen) {
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  if (*source == '=') {
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    strncpy(out, source+1, bufflen);  /* remove first char */
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    out[bufflen-1] = '\0';  /* ensures null termination */
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  }
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  else {  /* out = "source", or "...source" */
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    if (*source == '@') {
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      size_t l;
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      source++;  /* skip the `@' */
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      bufflen -= sizeof(" '...' ");
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      l = strlen(source);
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      strcpy(out, "");
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      if (l > bufflen) {
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        source += (l-bufflen);  /* get last part of file name */
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        strcat(out, "...");
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      }
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      strcat(out, source);
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    }
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    else {  /* out = [string "string"] */
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      size_t len = strcspn(source, "\n\r");  /* stop at first newline */
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      bufflen -= sizeof(" [string \"...\"] ");
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      if (len > bufflen) len = bufflen;
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      strcpy(out, "[string \"");
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      if (source[len] != '\0') {  /* must truncate? */
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        strncat(out, source, len);
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        strcat(out, "...");
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      }
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      else
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        strcat(out, source);
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      strcat(out, "\"]");
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    }
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  }
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}