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/* 
|| This file is part of Pike. For copyright information see COPYRIGHT. 
|| Pike is distributed under GPL, LGPL and MPL. See the file COPYING 
|| for more information. 
*/ 
 
#include "global.h" 
#include "stralloc.h" 
#include "bignum.h" 
#include "interpret.h" 
 
#include "shuffler.h" 
 
 
/* Source: String 
 * Argument: 8-bit string 
 */ 
 
struct ps_source 
{ 
  struct source s; 
 
  struct pike_string*str; 
  char *data; 
  size_t len; 
}; 
 
static struct data get_data( struct source *src, off_t len ) 
{ 
  struct ps_source *s = (struct ps_source *)src; 
  struct data res; 
 
  if( len > s->len ) { 
    len = s->len; 
    s->s.eof = 1; /* next read will be done from the next source */ 
  } 
 
  res.data = s->data; 
  s->data += len; 
  s->len -= res.len = len; 
 
  return res; 
} 
 
static void free_source( struct source *src ) 
{ 
  free_string(((struct ps_source *)src)->str); 
} 
 
struct source *source_pikestring_make( struct svalue *s, 
                                       INT64 start, INT64 len ) 
{ 
  struct ps_source *res; 
  INT64 slen; 
 
  if (TYPEOF(*s) != PIKE_T_STRING 
   || s->u.string->size_shift) 
    return 0; 
 
  if (!(res = calloc(1, sizeof(struct ps_source)))) 
    return 0; 
 
  debug_malloc_touch(res); 
 
  res->s.free_source = free_source; 
  res->s.get_data = get_data; 
 
  copy_shared_string(res->str, s->u.string); 
  res->data = res->str->str + start; 
 
  slen = res->str->len - start; 
  if (len >= 0 && slen < len) 
    slen = len; 
  if (slen < 0) 
    slen = 0; 
 
  res->len = slen; 
  return (struct source *)res; 
} 
 
void source_pikestring_init( ) 
{ 
  /* nothing to do here */ 
} 
 
void source_pikestring_exit( ) 
{ 
  /* nothing to do here */ 
}