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diff --git a/csvncgi/strbuf.c b/csvncgi/strbuf.c
new file mode 100644
index 0000000..e336982
--- /dev/null
+++ b/csvncgi/strbuf.c
@@ -0,0 +1,708 @@
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <sys/sysinfo.h>
+#include <sys/types.h>
+#include <stdint.h>
+#include <dirent.h>
+#include <sys/stat.h> /* chmod(2)    */
+#include <sys/file.h>
+#include <sys/mman.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <string.h>   /* strdup(3)   */
+#include <libgen.h>   /* basename(3) */
+#include <ctype.h>    /* tolower(3)  */
+#include <errno.h>
+#include <time.h>
+#include <sys/time.h>
+#include <pwd.h>
+#include <grp.h>
+#include <stdarg.h>
+#include <unistd.h>
+
+#define PCRE2_CODE_UNIT_WIDTH 8
+#include <pcre2.h>
+
+#include <nls.h>
+
+#include <defs.h>
+#include <wrapper.h>
+#include <strbuf.h>
+
+
+struct symbol *strbuf_envtab = (struct symbol *)0;
+
+struct symbol *envtab_install( struct symbol **sym, const char *n, const char *v, envtab_error fatal )
+{
+  struct symbol *ep = NULL;
+  size_t len;
+
+  if( !sym || !n || !v || !fatal )
+    return (struct symbol *)NULL;
+
+  ep = (struct symbol *)malloc( sizeof(struct symbol) );
+  if( !ep )
+  {
+    fatal( "cannot allocate memory for symbol '%s'", n );
+  }
+  bzero( (void *)ep, sizeof(struct symbol) );
+
+  len = strlen( n ) + 1;
+  ep->name = (char *)malloc( len );
+  if( !ep->name )
+  {
+    fatal( "cannot allocate memory for symbol name '%s'", n );
+  }
+  bzero( (void *)ep->name, len );
+  strncpy( ep->name, n, len );
+
+  len = strlen( v ) + 1;
+  ep->value = (char *)malloc( len );
+  if( !ep->value )
+  {
+    fatal( "cannot allocate memory for symbol value '%s'", v );
+  }
+  bzero( (void *)ep->value, len );
+  strncpy( ep->value, v, len );
+
+  ep->next = *sym;
+  *sym = ep;
+
+  return ep;
+}
+
+struct symbol *envtab_lookup( struct symbol **sym, const char *n )
+{
+  struct symbol *ep = NULL;
+
+  if( !sym || !n )
+    return (struct symbol *)NULL;
+
+  for( ep = *sym; ep != (struct symbol *)0; ep = ep->next )
+      if( strcmp( ep->name, n ) == 0 ) return( ep );
+
+  return (struct symbol *)NULL;
+}
+
+void envtab_release( struct symbol **sym )
+{
+  struct symbol *tab = *sym;
+
+  while( tab )
+  {
+    struct symbol *ep = tab;
+    tab = ep->next;
+    if( ep->name )  free( ep->name );
+    if( ep->value ) free( ep->value );
+    free( ep );
+  }
+  *sym = (struct symbol *)NULL;
+}
+
+
+#define STRBUF_ERRMSG_SIZE 4096
+
+void strbuf_fatal( const char *fmt, ... )
+{
+  va_list arg_ptr;
+  char  buf[STRBUF_ERRMSG_SIZE];
+  char  msg[STRBUF_ERRMSG_SIZE];
+  char *format = "%s: %s\n";
+
+  va_start( arg_ptr, fmt );
+
+  vsnprintf( msg, STRBUF_ERRMSG_SIZE, (const void *)fmt, arg_ptr );
+
+  va_end( arg_ptr ); /* Reset variable arguments. */
+
+  snprintf( buf, STRBUF_ERRMSG_SIZE, format, "strbuf", msg );
+
+  (void)write( STDERR_FILENO, buf, strlen( buf ) );
+
+  exit( 1 );
+}
+
+char strbuf_slopbuf[1];
+
+#define alloc_nz(x) (((x)+16)*3/2)
+
+static void alloc_grow( struct strbuf *sb, size_t size )
+{
+  if( size > sb->alloc )
+  {
+    if( alloc_nz(sb->alloc) < (size) )
+      sb->alloc = size;
+    else
+      sb->alloc = alloc_nz(sb->alloc);
+
+    sb->buf = xrealloc( (void *)sb->buf, sb->alloc );
+    memset( (void *)(sb->buf + sb->len), 0, (size_t)(sb->alloc - sb->len) );
+  }
+}
+
+void strbuf_grow( struct strbuf *sb, size_t extra )
+{
+  int new_buf = !sb->alloc;
+
+  if( new_buf )
+    sb->buf = NULL;
+
+  alloc_grow( sb, sb->len + extra + 1 );
+
+  if( new_buf )
+    sb->buf[0] = '\0';
+}
+
+/*
+   Функцию strbuf_init() надо вызывать в том случае, когда необходимо
+   задать внешнюю функцию обработки фатальной ошибки. Функция обработки
+   фатальной ошибки, в отличие от стандартной, может выводить как JSON
+   ответы, так и файлы 404.html, 50x.html, используя собственный буфер.
+ */
+void strbuf_init( struct strbuf *sb, strbuf_error fatal, size_t hint )
+{
+  sb->alloc = sb->len = 0;
+  sb->fatal = strbuf_fatal;
+  sb->buf   = strbuf_slopbuf;
+
+  if( fatal )
+    sb->fatal = fatal;
+
+  if( hint )
+    strbuf_grow( sb, hint );
+}
+
+void strbuf_release( struct strbuf *sb )
+{
+  if( sb->alloc )
+  {
+    free( sb->buf );
+    strbuf_init( sb, (strbuf_error)0, 0 );
+  }
+}
+
+char *strbuf_detach( struct strbuf *sb, size_t *sz )
+{
+  char *ret;
+  strbuf_grow( sb, 0 );
+  ret = sb->buf;
+  if( sz )
+    *sz = sb->len;
+  strbuf_init( sb, sb->fatal, 0 );
+  return ret;
+}
+
+void strbuf_attach( struct strbuf *sb, void *buf, size_t len, size_t alloc )
+{
+  strbuf_release( sb );
+  sb->buf   = buf;
+  sb->len   = len;
+  sb->alloc = alloc;
+  strbuf_grow( sb, 0 );
+  sb->buf[sb->len] = '\0';
+}
+
+void strbuf_ltrim( struct strbuf *sb )
+{
+  char *b = sb->buf;
+  while( sb->len > 0 && isspace(*b) )
+  {
+    b++;
+    sb->len--;
+  }
+  memmove( sb->buf, b, sb->len );
+  sb->buf[sb->len] = '\0';
+}
+
+void strbuf_rtrim( struct strbuf *sb )
+{
+  while( sb->len > 0 && isspace((unsigned char)sb->buf[sb->len - 1]) )
+    sb->len--;
+  sb->buf[sb->len] = '\0';
+}
+
+void strbuf_trim( struct strbuf *sb )
+{
+  strbuf_rtrim( sb );
+  strbuf_ltrim( sb );
+}
+
+
+void strbuf_trim_trailing_dir_sep( struct strbuf *sb )
+{
+  while( sb->len > 0 && is_dir_sep((unsigned char)sb->buf[sb->len - 1]) )
+    sb->len--;
+  sb->buf[sb->len] = '\0';
+}
+
+void strbuf_trim_trailing_newline( struct strbuf *sb )
+{
+  if( sb->len > 0 && sb->buf[sb->len - 1] == '\n' )
+  {
+    if( --sb->len > 0 && sb->buf[sb->len - 1] == '\r' )
+      --sb->len;
+    sb->buf[sb->len] = '\0';
+  }
+}
+
+int strbuf_cmp( const struct strbuf *a, const struct strbuf *b )
+{
+  size_t len = a->len < b->len ? a->len: b->len;
+  int    cmp = memcmp( a->buf, b->buf, len );
+  if( cmp )
+    return cmp;
+  return a->len < b->len ? -1: a->len != b->len;
+}
+
+
+/* Adding data to the buffer */
+
+void strbuf_add( struct strbuf *sb, const void *data, size_t len )
+{
+  strbuf_grow( sb, len );
+  memcpy( sb->buf + sb->len, data, len );
+  strbuf_setlen( sb, sb->len + len );
+}
+
+void strbuf_addbuf( struct strbuf *sb, const struct strbuf *sb2 )
+{
+  strbuf_grow( sb, sb2->len );
+  memcpy( sb->buf + sb->len, sb2->buf, sb2->len );
+  strbuf_setlen( sb, sb->len + sb2->len );
+}
+
+void strbuf_addbuf_percentquote( struct strbuf *dst, const struct strbuf *src )
+{
+  size_t i, len = src->len;
+
+  for (i = 0; i < len; i++) {
+    if( src->buf[i] == '%' )
+      strbuf_addch( dst, '%' );
+    strbuf_addch( dst, src->buf[i] );
+  }
+}
+
+void strbuf_addchars( struct strbuf *sb, int c, size_t n )
+{
+  strbuf_grow( sb, n );
+  memset( sb->buf + sb->len, c, n );
+  strbuf_setlen( sb, sb->len + n );
+}
+
+void strbuf_vaddf( struct strbuf *sb, const char *fmt, va_list ap )
+{
+  int len;
+  va_list cp;
+
+  if( !strbuf_avail( sb ) )
+    strbuf_grow( sb, 64 );
+  va_copy( cp, ap );
+  len = vsnprintf( sb->buf + sb->len, sb->alloc - sb->len, fmt, cp );
+  va_end( cp );
+  if( len < 0 )
+    sb->fatal( "your vsnprintf is broken (returned %d)", len );
+  if( len > strbuf_avail( sb ) )
+  {
+    strbuf_grow( sb, len );
+    len = vsnprintf( sb->buf + sb->len, sb->alloc - sb->len, fmt, ap );
+    if( len > strbuf_avail( sb ) )
+      sb->fatal( "your vsnprintf is broken (insatiable)" );
+  }
+  strbuf_setlen( sb, sb->len + len );
+}
+
+void strbuf_addf( struct strbuf *sb, const char *fmt, ... )
+{
+  va_list ap;
+  va_start( ap, fmt );
+  strbuf_vaddf( sb, fmt, ap );
+  va_end( ap );
+}
+
+
+size_t strbuf_fread( struct strbuf *sb, FILE *fp )
+{
+  size_t ret, nb = 64, read = 0;
+  size_t oldalloc = sb->alloc;
+
+  if( !sb || !fp ) return read;
+
+  do
+  {
+    strbuf_grow( sb, nb );
+    ret = fread( sb->buf + sb->len, 1, nb, fp );
+    if( ret > 0 )
+    {
+      strbuf_setlen( sb, sb->len + ret );
+      read += ret;
+    }
+    else if( oldalloc == 0 )
+    {
+      strbuf_release( sb );
+      return ret;
+    }
+
+  } while( ret == nb );
+
+  return read;
+}
+
+
+#define NAMELEN_MAX  128
+
+size_t strbuf_env_fread( struct strbuf *sb, FILE *fp )
+{
+  size_t  read = 0;
+  char   *ln, line[STRBUF_MAXLINE], retline[STRBUF_MAXLINE];
+
+  if( !sb || !fp ) return read;
+
+  bzero( (void *)line, STRBUF_MAXLINE );
+  bzero( (void *)retline, STRBUF_MAXLINE );
+
+  while( (ln = fgets( line, STRBUF_MAXLINE, fp )) )
+  {
+    char *start = NULL, *stop = NULL;
+    char *sp = ln;
+
+    if( (start = strstr( sp, "${" )) && (stop = strstr( sp, "}" )) && ((stop - start) > 1) )
+    {
+      struct symbol *sym = NULL;
+      char  *lp = retline;
+
+      do
+      {
+        /* may be multiple variables on a single line: */
+
+        *start = '\0'; *stop++ = '\0';
+        if( (sym = envtab_lookup( &strbuf_envtab, start+2 )) && sym->value && sym->value[0] )
+        {
+          strncpy( lp, (const char *)sp, (size_t)(start - sp + 1) );
+          lp += (start - sp);
+          strcpy( lp, (const char *)sym->value );
+          lp += strlen( sym->value );
+          strcpy( lp, (const char *)stop );
+          sp = stop;
+        }
+        else
+        {
+          strncpy( lp, (const char *)sp, (size_t)(start - sp + 1) );
+          lp += (start - sp);
+          strcpy( lp, (const char *)stop );
+          sp = stop;
+        }
+
+      } while( (start = strstr( sp, "${" )) && (stop = strstr( sp, "}" )) && ((stop - start) > 1) );
+
+      strbuf_addstr( sb, retline );
+      read += strlen( retline );;
+    }
+    else
+    {
+      strbuf_addstr( sb, line );
+      read += strlen( line );;
+    }
+
+  } /* End of while( ln ) */
+
+  return read;
+}
+
+ssize_t strbuf_read( struct strbuf *sb, int fd, size_t hint )
+{
+  size_t oldlen   = sb->len;
+  size_t oldalloc = sb->alloc;
+
+  strbuf_grow(sb, hint ? hint : 8192);
+  for( ;; )
+  {
+    ssize_t want = sb->alloc - sb->len - 1;
+    ssize_t got  = read_in_full( fd, sb->buf + sb->len, want );
+
+    if( got < 0 )
+    {
+      if( oldalloc == 0 )
+        strbuf_release( sb );
+      else
+        strbuf_setlen( sb, oldlen );
+      return -1;
+    }
+    sb->len += got;
+    if( got < want )
+      break;
+    strbuf_grow( sb, 8192 );
+  }
+
+  sb->buf[sb->len] = '\0';
+  return sb->len - oldlen;
+}
+
+
+size_t strbuf_fwrite( struct strbuf *sb, FILE *fp )
+{
+  return sb->len ? fwrite( sb->buf, 1, sb->len, fp ) : 0;
+}
+
+ssize_t strbuf_write( struct strbuf *sb, int fd )
+{
+  return sb->len ? write( fd, (const void *)sb->buf, sb->len ) : 0;
+}
+
+
+/* XML quoted: */
+
+void strbuf_addstr_xml_quoted( struct strbuf *sb, const char *s )
+{
+  while( *s )
+  {
+    size_t len = strcspn( s, "\"<>&" );
+    strbuf_add( sb, s, len );
+    s += len;
+
+    switch( *s )
+    {
+      case '"':
+        strbuf_addstr( sb, "&quot;" );
+        break;
+      case '<':
+        strbuf_addstr( sb, "&lt;" );
+        break;
+      case '>':
+        strbuf_addstr( sb, "&gt;" );
+        break;
+      case '&':
+        strbuf_addstr( sb, "&amp;" );
+        break;
+      case 0:
+        return;
+    }
+    s++;
+  }
+}
+
+static int is_html_quoted( const char *str )
+{
+  int         rc = 0, error = 0;
+  PCRE2_SIZE  offset = 0;
+  const char  pattern[] = "^(&[#A-Za-z0-9]*;)";
+
+  pcre2_match_data *match;
+
+  pcre2_code *regexp = pcre2_compile( (PCRE2_SPTR)pattern, PCRE2_ZERO_TERMINATED, 0, &error, &offset, NULL );
+  if( regexp == NULL )
+  {
+    return 0; /* PCRE compilation failed */
+  }
+
+  match = pcre2_match_data_create_from_pattern( regexp, NULL );
+
+  rc = pcre2_match( regexp, (PCRE2_SPTR)str, (PCRE2_SIZE)strlen(str), 0, 0, match, NULL ); /* sizeof(match)/sizeof(match[0]) */
+  if( rc < 0 )
+  {
+    /* not match */
+    pcre2_match_data_free( match );
+    pcre2_code_free( regexp );
+    return 0;
+  }
+  else
+  {
+    /* match */
+    pcre2_match_data_free( match );
+    pcre2_code_free( regexp );
+    return 1;
+  }
+}
+
+void strbuf_addstr_html_quoted( struct strbuf *sb, const char *s )
+{
+  while( *s )
+  {
+    size_t len = strcspn( s, "\"<>&" );
+    strbuf_add( sb, s, len );
+    s += len;
+
+    switch( *s )
+    {
+      case '"':
+        strbuf_addstr( sb, "&quot;" );
+        break;
+      case '<':
+        strbuf_addstr( sb, "&lt;" );
+        break;
+      case '>':
+        strbuf_addstr( sb, "&gt;" );
+        break;
+      case '&':
+        if( !is_html_quoted( s ) )
+          strbuf_addstr( sb, "&amp;" );
+        else
+          strbuf_addch( sb, *s );
+        break;
+      case 0:
+        return;
+    }
+    s++;
+  }
+}
+
+
+/* urlencode: */
+
+int is_rfc3986_reserved_or_unreserved( char ch )
+{
+  if( is_rfc3986_unreserved(ch) )
+    return 1;
+  switch( ch )
+  {
+    case '!': case '*': case '\'': case '(': case ')': case ';':
+    case ':': case '@': case '&': case '=': case '+': case '$':
+    case ',': case '/': case '?': case '#': case '[': case ']':
+      return 1;
+  }
+  return 0;
+}
+
+int is_rfc3986_unreserved( char ch )
+{
+  return isalnum(ch) || ch == '-' || ch == '_' || ch == '.' || ch == '~';
+}
+
+static void
+strbuf_add_urlencode( struct strbuf *sb, const char *s, size_t len,
+                      char_predicate allow_unencoded_fn )
+{
+  strbuf_grow( sb, len );
+  while( len-- )
+  {
+    char ch = *s++;
+    if( allow_unencoded_fn(ch) )
+      strbuf_addch( sb, ch );
+    else
+      strbuf_addf( sb, "%%%02x", (unsigned char)ch );
+  }
+}
+
+void strbuf_addstr_urlencode( struct strbuf *sb, const char *s, char_predicate allow_unencoded_fn )
+{
+  strbuf_add_urlencode( sb, s, strlen(s), allow_unencoded_fn );
+}
+
+
+/* humanise: */
+
+static void strbuf_humanise( struct strbuf *sb, off_t bytes, int humanise_rate )
+{
+  if( bytes > 1 << 30 )
+  {
+    strbuf_addf( sb,
+      humanise_rate == 0 ?
+        /* TRANSLATORS: IEC 80000-13:2008 gibibyte */
+        _("%u.%2.2u GiB") :
+        /* TRANSLATORS: IEC 80000-13:2008 gibibyte/second */
+        _("%u.%2.2u GiB/s"),
+        (unsigned)(bytes >> 30),
+        (unsigned)(bytes & ((1 << 30) - 1)) / 10737419 );
+  }
+  else if( bytes > 1 << 20 )
+  {
+    unsigned x = bytes + 5243;  /* for rounding */
+    strbuf_addf( sb,
+      humanise_rate == 0 ?
+        /* TRANSLATORS: IEC 80000-13:2008 mebibyte */
+        _("%u.%2.2u MiB") :
+        /* TRANSLATORS: IEC 80000-13:2008 mebibyte/second */
+        _("%u.%2.2u MiB/s"),
+        x >> 20, ((x & ((1 << 20) - 1)) * 100) >> 20 );
+  }
+  else if( bytes > 1 << 10 )
+  {
+    unsigned x = bytes + 5;  /* for rounding */
+    strbuf_addf( sb,
+      humanise_rate == 0 ?
+        /* TRANSLATORS: IEC 80000-13:2008 kibibyte */
+        _("%u.%2.2u KiB") :
+        /* TRANSLATORS: IEC 80000-13:2008 kibibyte/second */
+        _("%u.%2.2u KiB/s"),
+        x >> 10, ((x & ((1 << 10) - 1)) * 100) >> 10 );
+  }
+  else
+  {
+    strbuf_addf( sb,
+      humanise_rate == 0 ?
+        /* TRANSLATORS: IEC 80000-13:2008 byte */
+        Q_("%u byte", "%u bytes", (unsigned)bytes) :
+        /* TRANSLATORS: IEC 80000-13:2008 byte/second */
+        Q_("%u byte/s", "%u bytes/s", (unsigned)bytes),
+      (unsigned)bytes );
+  }
+}
+
+void strbuf_humanise_bytes( struct strbuf *sb, off_t bytes )
+{
+  strbuf_humanise( sb, bytes, 0 );
+}
+
+void strbuf_humanise_rate( struct strbuf *sb, off_t bytes )
+{
+  strbuf_humanise( sb, bytes, 1 );
+}
+
+
+int is_directory( const char *path )
+{
+  struct stat st;
+  return ( !stat( path, &st ) && S_ISDIR(st.st_mode) );
+}
+
+void strbuf_selfdir( struct strbuf *sb )
+{
+  char    path[PATH_MAX];
+  ssize_t len;
+
+  bzero( (void *)path, PATH_MAX );
+
+  len = readlink( "/proc/self/exe", &path[0], (size_t)PATH_MAX );
+  if( len > 0 && len < PATH_MAX )
+  {
+    strbuf_addstr( sb, (const char *)dirname( (char *)&path[0] ) );
+  }
+  else
+    sb->fatal( "cannot get selfdir" );
+}
+
+void strbuf_relpath( struct strbuf *sb, const char *path )
+{
+  struct strbuf self = STRBUF_INIT;
+  char   p[PATH_MAX];
+
+  bzero( (void *)p, PATH_MAX );
+
+  if( realpath( path, (char *)&p[0] ) == NULL )
+  {
+    sb->fatal( "cannot get relative path of '%s'", path );
+  }
+
+  strbuf_init( &self, sb->fatal, 0 );
+  strbuf_selfdir( &self );
+
+  strbuf_addstr( sb, (const char *)&p[self.len] );
+
+  strbuf_release( &self );
+}
+
+void strbuf_abspath( struct strbuf *sb, const char *path )
+{
+  char p[PATH_MAX];
+
+  if( realpath( path, (char *)&p[0] ) == NULL )
+  {
+    sb->fatal( "cannot get absolute path of '%s'", path );
+  }
+
+  strbuf_addstr( sb, (char *)&p[0] );
+}