Function extract_varname

src/env.c:232–253

Return a pointer to a static buffer containing the VARNAME as extracted from a '${VARNAME}' string. The returned string will be NUL terminated. The returned pointer should not be freed. Return NULL if not a valid ${VARNAME} syntax. */

   The returned pointer should not be freed.
   Return NULL if not a valid ${VARNAME} syntax.  */
static char *
extract_varname (char const *str)
{
  char const *p = scan_varname (str);

  if (!p)
    return NULL;

  /* -2 and +2 (below) account for the '${' prefix.  */
  idx_t i = p - str - 2;

  if (i >= vnlen)
    {
      free (varname);
      varname = xpalloc (NULL, &vnlen, i + 1 - vnlen, -1, sizeof *varname);
    }

  memcpy (varname, str + 2, i);
  varname[i] = 0;

  return varname;
}

/* Temporary buffer used by --split-string processing.  */
struct splitbuf