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
  46 \f
  47
  48 /* {Ports - soft ports}
  49  *
  50  */
  51
  52
  53 #ifdef __STDC__
  54 static int
  55 prinsfpt (SCM exp, SCM port, int writing)
  56 #else
  57 static int
  58 prinsfpt (exp, port, writing)
  59      SCM exp;
  60      SCM port;
  61      int writing;
  62 #endif
  63 {
  64   scm_prinport (exp, port, "soft");
  65   return !0;
  66 }
  67
  68 /* sfputc sfwrite sfputs sfclose
  69  * are called within a SCM_SYSCALL.
  70  *
  71  * So we need to set errno to 0 before returning.  sfflush
  72  * may be called within a SCM_SYSCALL.  So we need to set errno to 0
  73  * before returning.
  74  */
  75
  76 #ifdef __STDC__
  77 static int
  78 sfputc (int c, SCM p)
  79 #else
  80 static int
  81 sfputc (c, p)
  82      int c;
  83      SCM p;
  84 #endif
  85 {
  86   scm_apply (SCM_VELTS (p)[0], SCM_MAKICHR (c), scm_listofnull);
  87   errno = 0;
  88   return c;
  89 }
  90
  91 #ifdef __STDC__
  92 static scm_sizet
  93 sfwrite (char *str, scm_sizet siz, scm_sizet num, SCM p)
  94 #else
  95 static scm_sizet
  96 sfwrite (str, siz, num, p)
  97      char *str;
  98      scm_sizet siz;
  99      scm_sizet num;
 100      SCM p;
 101 #endif
 102 {
 103   SCM sstr;
 104   sstr = scm_makfromstr (str, siz * num, 0);
 105   scm_apply (SCM_VELTS (p)[1], sstr, scm_listofnull);
 106   errno = 0;
 107   return num;
 108 }
 109
 110 #ifdef __STDC__
 111 static int
 112 sfputs (char *s, SCM p)
 113 #else
 114 static int
 115 sfputs (s, p)
 116      char *s;
 117      SCM p;
 118 #endif
 119 {
 120   sfwrite (s, 1, strlen (s), p);
 121   return 0;
 122 }
 123
 124 #ifdef __STDC__
 125 static int
 126 sfflush (SCM stream)
 127 #else
 128 static int
 129 sfflush (stream)
 130      SCM stream;
 131 #endif
 132 {
 133   SCM f = SCM_VELTS (stream)[2];
 134   if (SCM_BOOL_F == f)
 135     return 0;
 136   f = scm_apply (f, SCM_EOL, SCM_EOL);
 137   errno = 0;
 138   return SCM_BOOL_F == f ? EOF : 0;
 139 }
 140
 141 #ifdef __STDC__
 142 static int
 143 sfgetc (SCM p)
 144 #else
 145 static int
 146 sfgetc (p)
 147      SCM p;
 148 #endif
 149 {
 150   SCM ans;
 151   ans = scm_apply (SCM_VELTS (p)[3], SCM_EOL, SCM_EOL);
 152   errno = 0;
 153   if (SCM_FALSEP (ans) || SCM_EOF_VAL == ans)
 154     return EOF;
 155   SCM_ASSERT (SCM_ICHRP (ans), ans, SCM_ARG1, "getc");
 156   return SCM_ICHR (ans);
 157 }
 158
 159 #ifdef __STDC__
 160 static int
 161 sfclose (SCM p)
 162 #else
 163 static int
 164 sfclose (p)
 165      SCM p;
 166 #endif
 167 {
 168   SCM f = SCM_VELTS (p)[4];
 169   if (SCM_BOOL_F == f)
 170     return 0;
 171   f = scm_apply (f, SCM_EOL, SCM_EOL);
 172   errno = 0;
 173   return SCM_BOOL_F == f ? EOF : 0;
 174 }
 175
 176
 177
 178 SCM_PROC(s_make_soft_port, "make-soft-port", 2, 0, 0, scm_make_soft_port);
 179 #ifdef __STDC__
 180 SCM
 181 scm_make_soft_port (SCM pv, SCM modes)
 182 #else
 183 SCM
 184 scm_make_soft_port (pv, modes)
 185      SCM pv;
 186      SCM modes;
 187 #endif
 188 {
 189   struct scm_port_table * pt;
 190   SCM z;
 191   SCM_ASSERT (SCM_NIMP (pv) && SCM_VECTORP (pv) && 5 == SCM_LENGTH (pv), pv, SCM_ARG1, s_make_soft_port);
 192   SCM_ASSERT (SCM_NIMP (modes) && SCM_STRINGP (modes), modes, SCM_ARG2, s_make_soft_port);
 193   SCM_NEWCELL (z);
 194   SCM_DEFER_INTS;
 195   pt = scm_add_to_port_table (z);
 196   SCM_CAR (z) = scm_tc16_sfport | scm_mode_bits (SCM_CHARS (modes));
 197   SCM_SETPTAB_ENTRY (z, pt);
 198   SCM_SETSTREAM (z, pv);
 199   SCM_ALLOW_INTS;
 200   return z;
 201 }
 202
 203 #ifdef __STDC__
 204 static int
 205 noop0 (FILE *stream)
 206 #else
 207 static int
 208 noop0 (stream)
 209      FILE *stream;
 210 #endif
 211 {
 212   return 0;
 213 }
 214
 215
 216 scm_ptobfuns scm_sfptob =
 217 {
 218   scm_markstream,
 219   noop0,
 220   prinsfpt,
 221   0,
 222   sfputc,
 223   sfputs,
 224   sfwrite,
 225   sfflush,
 226   sfgetc,
 227   sfclose
 228 };
 229
 230
 231 #ifdef __STDC__
 232 void
 233 scm_init_vports (void)
 234 #else
 235 void
 236 scm_init_vports ()
 237 #endif
 238 {
 239 #include "vports.x"
 240 }
 241