libguile/genio.c

   1 /*      Copyright (C) 1995,1996, 1997 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 #include <stdio.h>
  43 #include "_scm.h"
  44 #include "chars.h"
  45 #ifdef GUILE_ISELECT
  46 #include "filesys.h"
  47 #endif
  48
  49 #include "genio.h"
  50
  51 #ifdef HAVE_STRING_H
  52 #include <string.h>
  53 #endif
  54 \f
  55
  56 void
  57 scm_putc (c, port)
  58      int c;
  59      SCM port;
  60 {
  61   scm_sizet i = SCM_PTOBNUM (port);
  62   SCM_SYSCALL ((scm_ptobs[i].fputc) (c, SCM_STREAM (port)));
  63 }
  64
  65 void
  66 scm_puts (s, port)
  67      char *s;
  68      SCM port;
  69 {
  70   scm_sizet i = SCM_PTOBNUM (port);
  71   SCM_SYSCALL ((scm_ptobs[i].fputs) (s, SCM_STREAM (port)));
  72 #ifdef TRANSCRIPT_SUPPORT
  73   if (scm_trans && (port == def_outp || port == cur_errp))
  74     SCM_SYSCALL (fputs (s, scm_trans));
  75 #endif
  76 }
  77
  78 void
  79 scm_lfwrite (ptr, size, port)
  80      char *ptr;
  81      scm_sizet size;
  82      SCM port;
  83 {
  84   scm_sizet i = SCM_PTOBNUM (port);
  85   SCM_SYSCALL (scm_ptobs[i].fwrite(ptr, size, 1, SCM_STREAM (port)));
  86 #ifdef TRANSCRIPT_SUPPORT
  87   if (scm_trans && (port == def_outp || port == cur_errp))
  88     SCM_SYSCALL (fwrite (ptr, size, 1, scm_trans));
  89 #endif
  90 }
  91
  92
  93 \f
  94
  95 int
  96 scm_getc (port)
  97      SCM port;
  98 {
  99   SCM f;
 100   int c;
 101   scm_sizet i;
 102
 103   /* One char may be stored in the high bits of (car port) orre@nada.kth.se. */
 104   if (SCM_CRDYP (port))
 105     {
 106       c = SCM_CGETUN (port);
 107       SCM_CLRDY (port);         /* Clear ungetted char */
 108     }
 109   else
 110     {
 111       f = SCM_STREAM (port);
 112       i = SCM_PTOBNUM (port);
 113 #ifdef GUILE_ISELECT
 114       if (SCM_FPORTP (port) && !scm_input_waiting_p ((FILE *) f, "scm_getc"))
 115         {
 116           int n;
 117           SELECT_TYPE readfds;
 118           int fd = fileno ((FILE *) f);
 119           do
 120             {
 121               FD_ZERO (&readfds);
 122               FD_SET (fd, &readfds);
 123               n = scm_internal_select (fd + 1, &readfds, NULL, NULL, NULL);
 124             }
 125           while (n == -1 && errno == EINTR);
 126         }
 127 #endif
 128       SCM_SYSCALL (c = (scm_ptobs[i].fgetc) (f));
 129     }
 130
 131   if (c == '\n')
 132     {
 133       SCM_INCLINE (port);
 134     }
 135   else if (c == '\t')
 136     {
 137       SCM_TABCOL (port);
 138     }
 139   else
 140     {
 141       SCM_INCCOL (port);
 142     }
 143
 144   return c;
 145 }
 146
 147
 148 void
 149 scm_ungetc (c, port)
 150      int c;
 151      SCM port;
 152 {
 153 /*      SCM_ASSERT(!SCM_CRDYP(port), port, SCM_ARG2, "too many scm_ungetc");*/
 154   SCM_CUNGET (c, port);
 155   if (c == '\n')
 156     {
 157       /* What should col be in this case?
 158        * We'll leave it at -1.
 159        */
 160       SCM_LINUM (port) -= 1;
 161     }
 162   else
 163     SCM_COL(port) -= 1;
 164 }
 165
 166
 167 char *
 168 scm_do_read_line (port, len)
 169      SCM port;
 170      int *len;
 171 {
 172   char *s;
 173   scm_sizet i;
 174
 175   i = SCM_PTOBNUM (port);
 176   SCM_SYSCALL (s = (scm_ptobs[i].fgets) (port, len));
 177   return s;
 178 }
 179