libguile/vports.c

   1 /*      Copyright (C) 1995,1996,1998 Free Software Foundation, Inc.
   2  *
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License as published by
   5  * the Free Software Foundation; either version 2, or (at your option)
   6  * any later version.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this software; see the file COPYING.  If not, write to
  15  * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  16  * Boston, MA 02111-1307 USA
  17  *
  18  * As a special exception, the Free Software Foundation gives permission
  19  * for additional uses of the text contained in its release of GUILE.
  20  *
  21  * The exception is that, if you link the GUILE library with other files
  22  * to produce an executable, this does not by itself cause the
  23  * resulting executable to be covered by the GNU General Public License.
  24  * Your use of that executable is in no way restricted on account of
  25  * linking the GUILE library code into it.
  26  *
  27  * This exception does not however invalidate any other reasons why
  28  * the executable file might be covered by the GNU General Public License.
  29  *
  30  * This exception applies only to the code released by the
  31  * Free Software Foundation under the name GUILE.  If you copy
  32  * code from other Free Software Foundation releases into a copy of
  33  * GUILE, as the General Public License permits, the exception does
  34  * not apply to the code that you add in this way.  To avoid misleading
  35  * anyone as to the status of such modified files, you must delete
  36  * this exception notice from them.
  37  *
  38  * If you write modifications of your own for GUILE, it is your choice
  39  * whether to permit this exception to apply to your modifications.
  40  * If you do not wish that, delete this exception notice.  */
  41 \f
  42
  43 #include <stdio.h>
  44 #include "_scm.h"
  45 #include "eval.h"
  46 #include "chars.h"
  47 #include "fports.h"
  48
  49 #include "vports.h"
  50
  51 #ifdef HAVE_STRING_H
  52 #include <string.h>
  53 #endif
  54
  55 \f
  56
  57 /* {Ports - soft ports}
  58  *
  59  */
  60
  61
  62
  63 static int prinsfpt SCM_P ((SCM exp, SCM port, scm_print_state *pstate));
  64
  65 static int
  66 prinsfpt (exp, port, pstate)
  67      SCM exp;
  68      SCM port;
  69      scm_print_state *pstate;
  70 {
  71   scm_prinport (exp, port, "soft");
  72   return !0;
  73 }
  74
  75 /* sfputc sfwrite sfputs sfclose
  76  * are called within a SCM_SYSCALL.
  77  *
  78  * So we need to set errno to 0 before returning.  sfflush
  79  * may be called within a SCM_SYSCALL.  So we need to set errno to 0
  80  * before returning.
  81  */
  82
  83
  84 static int
  85 sfputc (int c, SCM port)
  86 {
  87   SCM p = SCM_STREAM (port);
  88
  89   scm_apply (SCM_VELTS (p)[0], SCM_MAKICHR (c), scm_listofnull);
  90   errno = 0;
  91   return c;
  92 }
  93
  94
  95 static scm_sizet
  96 sfwrite (char *str, scm_sizet siz, scm_sizet num, SCM port)
  97 {
  98   SCM p = SCM_STREAM (port);
  99   SCM sstr;
 100   sstr = scm_makfromstr (str, siz * num, 0);
 101   scm_apply (SCM_VELTS (p)[1], sstr, scm_listofnull);
 102   errno = 0;
 103   return num;
 104 }
 105
 106
 107 static int
 108 sfputs (char *s, SCM port)
 109 {
 110   sfwrite (s, 1, strlen (s), port);
 111   return 0;
 112 }
 113
 114
 115 static int
 116 sfflush (SCM port)
 117 {
 118   SCM stream = SCM_STREAM (port);
 119
 120   SCM f = SCM_VELTS (stream)[2];
 121   if (SCM_BOOL_F == f)
 122     return 0;
 123   f = scm_apply (f, SCM_EOL, SCM_EOL);
 124   errno = 0;
 125   return SCM_BOOL_F == f ? EOF : 0;
 126 }
 127
 128
 129 static int
 130 sfgetc (SCM port)
 131 {
 132   SCM p = SCM_STREAM (port);
 133
 134   SCM ans;
 135   ans = scm_apply (SCM_VELTS (p)[3], SCM_EOL, SCM_EOL);
 136   errno = 0;
 137   if (SCM_FALSEP (ans) || SCM_EOF_OBJECT_P (ans))
 138     return EOF;
 139   SCM_ASSERT (SCM_ICHRP (ans), ans, SCM_ARG1, "getc");
 140   return SCM_ICHR (ans);
 141 }
 142
 143
 144 static int
 145 sfclose (SCM port)
 146 {
 147   SCM p = SCM_STREAM (port);
 148   SCM f = SCM_VELTS (p)[4];
 149   if (SCM_BOOL_F == f)
 150     return 0;
 151   f = scm_apply (f, SCM_EOL, SCM_EOL);
 152   errno = 0;
 153   return SCM_BOOL_F == f ? EOF : 0;
 154 }
 155
 156
 157
 158 SCM_PROC(s_make_soft_port, "make-soft-port", 2, 0, 0, scm_make_soft_port);
 159
 160 SCM
 161 scm_make_soft_port (pv, modes)
 162      SCM pv;
 163      SCM modes;
 164 {
 165   struct scm_port_table * pt;
 166   SCM z;
 167   SCM_ASSERT (SCM_NIMP (pv) && SCM_VECTORP (pv) && 5 == SCM_LENGTH (pv), pv, SCM_ARG1, s_make_soft_port);
 168   SCM_ASSERT (SCM_NIMP (modes) && SCM_ROSTRINGP (modes), modes, SCM_ARG2, s_make_soft_port);
 169   SCM_COERCE_SUBSTR (modes);
 170   SCM_NEWCELL (z);
 171   SCM_DEFER_INTS;
 172   pt = scm_add_to_port_table (z);
 173   SCM_SETCAR (z, scm_tc16_sfport | scm_mode_bits (SCM_ROCHARS (modes)));
 174   SCM_SETPTAB_ENTRY (z, pt);
 175   SCM_SETSTREAM (z, pv);
 176   SCM_ALLOW_INTS;
 177   return z;
 178 }
 179
 180
 181 static int
 182 noop0 (SCM port)
 183 {
 184   return 0;
 185 }
 186
 187
 188 scm_ptobfuns scm_sfptob =
 189 {
 190   scm_markstream,
 191   noop0,
 192   prinsfpt,
 193   0,
 194   sfputc,
 195   sfputs,
 196   sfwrite,
 197   sfflush,
 198   sfgetc,
 199   scm_generic_fgets,
 200   sfclose
 201 };
 202
 203
 204
 205 void
 206 scm_init_vports ()
 207 {
 208 #include "vports.x"
 209 }
 210