libguile/fports.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 #ifdef HAVE_STRING_H
  47 #include <string.h>
  48 #endif
  49 #ifdef HAVE_UNISTD_H
  50 #include <unistd.h>
  51 #else
  52 scm_sizet fwrite ();
  53 #endif
  54
  55
  56 #ifdef __IBMC__
  57 #include <io.h>
  58 #include <direct.h>
  59 #else
  60 #ifndef MSDOS
  61 #ifndef ultrix
  62 #ifndef vms
  63 #ifdef _DCC
  64 #include <ioctl.h>
  65 #define setbuf(stream, buf) setvbuf(stream, buf, _IONBF, 0)
  66 #else
  67 #ifdef MWC
  68 #include <sys/io.h>
  69 #else
  70 #ifndef THINK_C
  71 #ifndef ARM_ULIB
  72 #include <sys/ioctl.h>
  73 #endif
  74 #endif
  75 #endif
  76 #endif
  77 #endif
  78 #endif
  79 #endif
  80 #endif
  81 \f
  82
  83 /* {Ports - file ports}
  84  *
  85  */
  86
  87 /* should be called with SCM_DEFER_INTS active */
  88 #ifdef __STDC__
  89 SCM
  90 scm_setbuf0 (SCM port)
  91 #else
  92 SCM
  93 scm_setbuf0 (port)
  94      SCM port;
  95 #endif
  96 {
  97 #ifndef NOSETBUF
  98 #ifndef MSDOS
  99 #ifdef FIONREAD
 100 #ifndef ultrix
 101   SCM_SYSCALL (setbuf ((FILE *)SCM_STREAM (port), 0););
 102 #endif
 103 #endif
 104 #endif
 105 #endif
 106   return SCM_UNSPECIFIED;
 107 }
 108
 109 /* Return the flags that characterize a port based on the mode
 110  * string used to open a file for that port.
 111  *
 112  * See PORT FLAGS in scm.h
 113  */
 114 #ifdef __STDC__
 115 long
 116 scm_mode_bits (char *modes)
 117 #else
 118 long
 119 scm_mode_bits (modes)
 120      char *modes;
 121 #endif
 122 {
 123   return (SCM_OPN
 124           | (strchr (modes, 'r') || strchr (modes, '+') ? SCM_RDNG : 0)
 125           | (   strchr (modes, 'w')
 126              || strchr (modes, 'a')
 127              || strchr (modes, '+') ? SCM_WRTNG : 0)
 128           | (strchr (modes, '0') ? SCM_BUF0 : 0));
 129 }
 130
 131
 132 /* scm_open_file
 133  * Return a new port open on a given file.
 134  *
 135  * The mode string must match the pattern: [rwa+]** which
 136  * is interpreted in the usual unix way.
 137  *
 138  * Return the new port.
 139  */
 140
 141 #ifdef __STDC__
 142 SCM
 143 scm_mkfile (char * name, char * modes)
 144 #else
 145 SCM
 146 scm_mkfile (name, modes)
 147      char * name;
 148      char * modes;
 149 #endif
 150 {
 151   register SCM port;
 152   FILE *f;
 153   SCM_NEWCELL (port);
 154   SCM_DEFER_INTS;
 155   SCM_SYSCALL (f = fopen (name, modes));
 156   if (!f)
 157     {
 158       SCM_ALLOW_INTS;
 159       port = SCM_BOOL_F;
 160     }
 161   else
 162     {
 163       struct scm_port_table * pt;
 164       pt = scm_add_to_port_table (port);
 165       SCM_SETPTAB_ENTRY (port, pt);
 166       if (SCM_BUF0 & (SCM_CAR (port) = scm_tc16_fport | scm_mode_bits (modes)))
 167         scm_setbuf0 (port);
 168       SCM_SETSTREAM (port, (SCM)f);
 169       SCM_PTAB_ENTRY (port)->file_name = scm_makfrom0str (name);
 170       SCM_ALLOW_INTS;
 171     }
 172   return port;
 173 }
 174
 175 SCM_PROC(s_open_file, "open-file", 2, 0, 0, scm_open_file);
 176 #ifdef __STDC__
 177 SCM
 178 scm_open_file (SCM filename, SCM modes)
 179 #else
 180 SCM
 181 scm_open_file (filename, modes)
 182      SCM filename;
 183      SCM modes;
 184 #endif
 185 {
 186   SCM port;
 187   SCM_ASSERT (SCM_NIMP (filename) && SCM_ROSTRINGP (filename), filename, SCM_ARG1, s_open_file);
 188   SCM_ASSERT (SCM_NIMP (modes) && SCM_ROSTRINGP (modes), modes, SCM_ARG2, s_open_file);
 189   if (SCM_SUBSTRP (filename))
 190     filename = scm_makfromstr (SCM_ROCHARS (filename), SCM_ROLENGTH (filename), 0);
 191   if (SCM_SUBSTRP (modes))
 192     modes = scm_makfromstr (SCM_ROCHARS (modes), SCM_ROLENGTH (modes), 0);
 193   port = scm_mkfile (SCM_ROCHARS (filename), SCM_ROCHARS (modes));
 194
 195   if (port == SCM_BOOL_F) {
 196     SCM_SYSERROR1 (s_open_file);
 197     /* Force the compiler to keep filename and modes alive.  */
 198     scm_cons (filename, modes);
 199   }
 200   return port;
 201 }
 202
 203 /* Return the mode flags from an open port.
 204  * Some modes such as "append" are only used when opening
 205  * a file and are not returned here.
 206  */
 207
 208 SCM_PROC(s_port_mode, "port-mode", 1, 0, 0, scm_port_mode);
 209 #ifdef __STDC__
 210 SCM
 211 scm_port_mode (SCM port)
 212 #else
 213 SCM
 214 scm_port_mode (port)
 215      SCM port;
 216 #endif
 217 {
 218   char modes[3];
 219   modes[0] = '\0';
 220   SCM_ASSERT (SCM_NIMP (port) && SCM_OPPORTP (port), port, SCM_ARG1, s_port_mode);
 221   if (SCM_CAR (port) & SCM_RDNG) {
 222     if (SCM_CAR (port) & SCM_WRTNG)
 223       strcpy (modes, "r+");
 224     else
 225       strcpy (modes, "r");
 226   }
 227   else if (SCM_CAR (port) & SCM_WRTNG)
 228     strcpy (modes, "w");
 229   if (SCM_CAR (port) & SCM_BUF0)
 230     strcat (modes, "0");
 231   return scm_makfromstr (modes, strlen (modes), 0);
 232 }
 233
 234
 235 #ifdef __STDC__
 236 static int
 237 prinfport (SCM exp, SCM port, int writing)
 238 #else
 239 static int
 240 prinfport (exp, port, writing)
 241      SCM exp;
 242      SCM port;
 243      int writing;
 244 #endif
 245 {
 246   SCM name;
 247   char * c;
 248   if (SCM_CLOSEDP (exp))
 249     {
 250       c = "file";
 251     }
 252   else
 253     {
 254       name = SCM_PTAB_ENTRY (exp)->file_name;
 255       if (SCM_NIMP (name) && SCM_ROSTRINGP (name))
 256         c = SCM_ROCHARS (name);
 257       else
 258         c = "file";
 259     }
 260
 261   scm_prinport (exp, port, c);
 262   return !0;
 263 }
 264
 265
 266 #ifdef __STDC__
 267 static int
 268 scm_fgetc (FILE * s)
 269 #else
 270 static int
 271 scm_fgetc (s)
 272      FILE * s;
 273 #endif
 274 {
 275   if (feof (s))
 276     return EOF;
 277   else
 278     return fgetc (s);
 279 }
 280
 281 #ifdef vms
 282 #ifdef __STDC__
 283 static scm_sizet
 284 pwrite (char *ptr, scm_sizet size, nitems, FILE *port)
 285 #else
 286 static scm_sizet
 287 pwrite (ptr, size, nitems, port)
 288      char *ptr;
 289      scm_sizet size, nitems;
 290      FILE *port;
 291 #endif
 292 {
 293   scm_sizet len = size * nitems;
 294   scm_sizet i = 0;
 295   for (; i < len; i++)
 296     putc (ptr[i], port);
 297   return len;
 298 }
 299
 300 #define ffwrite pwrite
 301 #else
 302 #define ffwrite fwrite
 303 #endif
 304
 305 \f
 306 /* This otherwise pointless code helps some poor
 307  * crippled C compilers cope with life.
 308  */
 309 static int
 310 local_fclose (fp)
 311      FILE * fp;
 312 {
 313   return fclose (fp);
 314 }
 315
 316 static int
 317 local_fflush (fp)
 318      FILE * fp;
 319 {
 320   return fflush (fp);
 321 }
 322
 323 static int
 324 local_fputc (c, fp)
 325      int c;
 326      FILE * fp;
 327 {
 328   return fputc (c, fp);
 329 }
 330
 331 static int
 332 local_fputs (s, fp)
 333      char * s;
 334      FILE * fp;
 335 {
 336   return fputs (s, fp);
 337 }
 338
 339 static scm_sizet
 340 local_ffwrite (ptr, size, nitems, fp)
 341      void * ptr;
 342      int size;
 343      int nitems;
 344      FILE * fp;
 345 {
 346   return ffwrite (ptr, size, nitems, fp);
 347 }
 348
 349 \f
 350 scm_ptobfuns scm_fptob =
 351 {
 352   scm_mark0,
 353   local_fclose,
 354   prinfport,
 355   0,
 356   local_fputc,
 357   local_fputs,
 358   local_ffwrite,
 359   local_fflush,
 360   scm_fgetc,
 361   local_fclose
 362 };
 363
 364 /* {Pipe ports}
 365  */
 366 scm_ptobfuns scm_pipob =
 367 {
 368   scm_mark0,
 369   0,                            /* replaced by pclose in scm_init_ioext() */
 370   0,                            /* replaced by prinpipe in scm_init_ioext() */
 371   0,
 372   local_fputc,
 373   local_fputs,
 374   local_ffwrite,
 375   local_fflush,
 376   scm_fgetc,
 377   0
 378 };                              /* replaced by pclose in scm_init_ioext() */
 379
 380
 381 #ifdef __STDC__
 382 void
 383 scm_init_fports (void)
 384 #else
 385 void
 386 scm_init_fports ()
 387 #endif
 388 {
 389 #include "fports.x"
 390 }
 391