libguile/vports.c

   1 /*      Copyright (C) 1995,1996 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, 675 Mass Ave, Cambridge, MA 02139, USA.
  16  *
  17  * As a special exception, the Free Software Foundation gives permission
  18  * for additional uses of the text contained in its release of GUILE.
  19  *
  20  * The exception is that, if you link the GUILE library with other files
  21  * to produce an executable, this does not by itself cause the
  22  * resulting executable to be covered by the GNU General Public License.
  23  * Your use of that executable is in no way restricted on account of
  24  * linking the GUILE library code into it.
  25  *
  26  * This exception does not however invalidate any other reasons why
  27  * the executable file might be covered by the GNU General Public License.
  28  *
  29  * This exception applies only to the code released by the
  30  * Free Software Foundation under the name GUILE.  If you copy
  31  * code from other Free Software Foundation releases into a copy of
  32  * GUILE, as the General Public License permits, the exception does
  33  * not apply to the code that you add in this way.  To avoid misleading
  34  * anyone as to the status of such modified files, you must delete
  35  * this exception notice from them.
  36  *
  37  * If you write modifications of your own for GUILE, it is your choice
  38  * whether to permit this exception to apply to your modifications.
  39  * If you do not wish that, delete this exception notice.
  40  */
  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 sfputc SCM_P ((int c, SCM p));
  85
  86 static int
  87 sfputc (c, p)
  88      int c;
  89      SCM p;
  90 {
  91   scm_apply (SCM_VELTS (p)[0], SCM_MAKICHR (c), scm_listofnull);
  92   errno = 0;
  93   return c;
  94 }
  95
  96
  97 static scm_sizet sfwrite SCM_P ((char *str, scm_sizet siz, scm_sizet num, SCM p));
  98
  99 static scm_sizet
 100 sfwrite (str, siz, num, p)
 101      char *str;
 102      scm_sizet siz;
 103      scm_sizet num;
 104      SCM p;
 105 {
 106   SCM sstr;
 107   sstr = scm_makfromstr (str, siz * num, 0);
 108   scm_apply (SCM_VELTS (p)[1], sstr, scm_listofnull);
 109   errno = 0;
 110   return num;
 111 }
 112
 113
 114 static int sfputs SCM_P ((char *s, SCM p));
 115
 116 static int
 117 sfputs (s, p)
 118      char *s;
 119      SCM p;
 120 {
 121   sfwrite (s, 1, strlen (s), p);
 122   return 0;
 123 }
 124
 125
 126 static int sfflush SCM_P ((SCM stream));
 127
 128 static int
 129 sfflush (stream)
 130      SCM stream;
 131 {
 132   SCM f = SCM_VELTS (stream)[2];
 133   if (SCM_BOOL_F == f)
 134     return 0;
 135   f = scm_apply (f, SCM_EOL, SCM_EOL);
 136   errno = 0;
 137   return SCM_BOOL_F == f ? EOF : 0;
 138 }
 139
 140
 141 static int sfgetc SCM_P ((SCM p));
 142
 143 static int
 144 sfgetc (p)
 145      SCM p;
 146 {
 147   SCM ans;
 148   ans = scm_apply (SCM_VELTS (p)[3], SCM_EOL, SCM_EOL);
 149   errno = 0;
 150   if (SCM_FALSEP (ans) || SCM_EOF_VAL == ans)
 151     return EOF;
 152   SCM_ASSERT (SCM_ICHRP (ans), ans, SCM_ARG1, "getc");
 153   return SCM_ICHR (ans);
 154 }
 155
 156
 157 static int sfclose SCM_P ((SCM p));
 158
 159 static int
 160 sfclose (p)
 161      SCM p;
 162 {
 163   SCM f = SCM_VELTS (p)[4];
 164   if (SCM_BOOL_F == f)
 165     return 0;
 166   f = scm_apply (f, SCM_EOL, SCM_EOL);
 167   errno = 0;
 168   return SCM_BOOL_F == f ? EOF : 0;
 169 }
 170
 171
 172
 173 SCM_PROC(s_make_soft_port, "make-soft-port", 2, 0, 0, scm_make_soft_port);
 174
 175 SCM
 176 scm_make_soft_port (pv, modes)
 177      SCM pv;
 178      SCM modes;
 179 {
 180   struct scm_port_table * pt;
 181   SCM z;
 182   SCM_ASSERT (SCM_NIMP (pv) && SCM_VECTORP (pv) && 5 == SCM_LENGTH (pv), pv, SCM_ARG1, s_make_soft_port);
 183   SCM_ASSERT (SCM_NIMP (modes) && SCM_STRINGP (modes), modes, SCM_ARG2, s_make_soft_port);
 184   SCM_NEWCELL (z);
 185   SCM_DEFER_INTS;
 186   pt = scm_add_to_port_table (z);
 187   SCM_SETCAR (z, scm_tc16_sfport | scm_mode_bits (SCM_CHARS (modes)));
 188   SCM_SETPTAB_ENTRY (z, pt);
 189   SCM_SETSTREAM (z, pv);
 190   SCM_ALLOW_INTS;
 191   return z;
 192 }
 193
 194
 195 static int noop0 SCM_P ((SCM stream));
 196
 197 static int
 198 noop0 (stream)
 199      SCM stream;
 200 {
 201   return 0;
 202 }
 203
 204
 205 scm_ptobfuns scm_sfptob =
 206 {
 207   scm_markstream,
 208   noop0,
 209   prinsfpt,
 210   0,
 211   sfputc,
 212   sfputs,
 213   sfwrite,
 214   sfflush,
 215   sfgetc,
 216   sfclose
 217 };
 218
 219
 220
 221 void
 222 scm_init_vports ()
 223 {
 224 #include "vports.x"
 225 }
 226