libgfortran/io/intrinsics.c

   1 /* Implementation of the FGET, FGETC, FPUT, FPUTC, FLUSH
   2    FTELL, TTYNAM and ISATTY intrinsics.
   3    Copyright (C) 2005, 2007 Free Software Foundation, Inc.
   4
   5 This file is part of the GNU Fortran 95 runtime library (libgfortran).
   6
   7 Libgfortran is free software; you can redistribute it and/or
   8 modify it under the terms of the GNU General Public
   9 License as published by the Free Software Foundation; either
  10 version 2 of the License, or (at your option) any later version.
  11
  12 In addition to the permissions in the GNU General Public License, the
  13 Free Software Foundation gives you unlimited permission to link the
  14 compiled version of this file into combinations with other programs,
  15 and to distribute those combinations without any restriction coming
  16 from the use of this file.  (The General Public License restrictions
  17 do apply in other respects; for example, they cover modification of
  18 the file, and distribution when not linked into a combine
  19 executable.)
  20
  21 Libgfortran is distributed in the hope that it will be useful,
  22 but WITHOUT ANY WARRANTY; without even the implied warranty of
  23 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24 GNU General Public License for more details.
  25
  26 You should have received a copy of the GNU General Public
  27 License along with libgfortran; see the file COPYING.  If not,
  28 write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  29 Boston, MA 02110-1301, USA.  */
  30
  31 #include "io.h"
  32
  33 #ifdef HAVE_STDLIB_H
  34 #include <stdlib.h>
  35 #endif
  36
  37 #include <string.h>
  38
  39 static const int five = 5;
  40 static const int six = 6;
  41
  42 extern int PREFIX(fgetc) (const int *, char *, gfc_charlen_type);
  43 export_proto_np(PREFIX(fgetc));
  44
  45 int
  46 PREFIX(fgetc) (const int * unit, char * c, gfc_charlen_type c_len)
  47 {
  48   int ret;
  49   size_t s;
  50   gfc_unit * u = find_unit (*unit);
  51
  52   if (u == NULL)
  53     return -1;
  54
  55   s = 1;
  56   memset (c, ' ', c_len);
  57   ret = sread (u->s, c, s);
  58   unlock_unit (u);
  59
  60   if (ret < 0)
  61     return ret;
  62
  63   if (ret != 1)
  64     return -1;
  65   else
  66     return 0;
  67 }
  68
  69
  70 #define FGETC_SUB(kind) \
  71   extern void fgetc_i ## kind ## _sub \
  72     (const int *, char *, GFC_INTEGER_ ## kind *, gfc_charlen_type); \
  73   export_proto(fgetc_i ## kind ## _sub); \
  74   void fgetc_i ## kind ## _sub \
  75   (const int * unit, char * c, GFC_INTEGER_ ## kind * st, gfc_charlen_type c_len) \
  76     { if (st != NULL) \
  77         *st = PREFIX(fgetc) (unit, c, c_len); \
  78       else \
  79         PREFIX(fgetc) (unit, c, c_len); }
  80
  81 FGETC_SUB(1)
  82 FGETC_SUB(2)
  83 FGETC_SUB(4)
  84 FGETC_SUB(8)
  85
  86
  87 extern int PREFIX(fget) (char *, gfc_charlen_type);
  88 export_proto_np(PREFIX(fget));
  89
  90 int
  91 PREFIX(fget) (char * c, gfc_charlen_type c_len)
  92 {
  93   return PREFIX(fgetc) (&five, c, c_len);
  94 }
  95
  96
  97 #define FGET_SUB(kind) \
  98   extern void fget_i ## kind ## _sub \
  99     (char *, GFC_INTEGER_ ## kind *, gfc_charlen_type); \
 100   export_proto(fget_i ## kind ## _sub); \
 101   void fget_i ## kind ## _sub \
 102   (char * c, GFC_INTEGER_ ## kind * st, gfc_charlen_type c_len) \
 103     { if (st != NULL) \
 104         *st = PREFIX(fgetc) (&five, c, c_len); \
 105       else \
 106         PREFIX(fgetc) (&five, c, c_len); }
 107
 108 FGET_SUB(1)
 109 FGET_SUB(2)
 110 FGET_SUB(4)
 111 FGET_SUB(8)
 112
 113
 114
 115 extern int PREFIX(fputc) (const int *, char *, gfc_charlen_type);
 116 export_proto_np(PREFIX(fputc));
 117
 118 int
 119 PREFIX(fputc) (const int * unit, char * c,
 120                gfc_charlen_type c_len __attribute__((unused)))
 121 {
 122   ssize_t s;
 123   gfc_unit * u = find_unit (*unit);
 124
 125   if (u == NULL)
 126     return -1;
 127
 128   s = swrite (u->s, c, 1);
 129   unlock_unit (u);
 130   if (s < 0)
 131     return -1;
 132   return 0;
 133 }
 134
 135
 136 #define FPUTC_SUB(kind) \
 137   extern void fputc_i ## kind ## _sub \
 138     (const int *, char *, GFC_INTEGER_ ## kind *, gfc_charlen_type); \
 139   export_proto(fputc_i ## kind ## _sub); \
 140   void fputc_i ## kind ## _sub \
 141   (const int * unit, char * c, GFC_INTEGER_ ## kind * st, gfc_charlen_type c_len) \
 142     { if (st != NULL) \
 143         *st = PREFIX(fputc) (unit, c, c_len); \
 144       else \
 145         PREFIX(fputc) (unit, c, c_len); }
 146
 147 FPUTC_SUB(1)
 148 FPUTC_SUB(2)
 149 FPUTC_SUB(4)
 150 FPUTC_SUB(8)
 151
 152
 153 extern int PREFIX(fput) (char *, gfc_charlen_type);
 154 export_proto_np(PREFIX(fput));
 155
 156 int
 157 PREFIX(fput) (char * c, gfc_charlen_type c_len)
 158 {
 159   return PREFIX(fputc) (&six, c, c_len);
 160 }
 161
 162
 163 #define FPUT_SUB(kind) \
 164   extern void fput_i ## kind ## _sub \
 165     (char *, GFC_INTEGER_ ## kind *, gfc_charlen_type); \
 166   export_proto(fput_i ## kind ## _sub); \
 167   void fput_i ## kind ## _sub \
 168   (char * c, GFC_INTEGER_ ## kind * st, gfc_charlen_type c_len) \
 169     { if (st != NULL) \
 170         *st = PREFIX(fputc) (&six, c, c_len); \
 171       else \
 172         PREFIX(fputc) (&six, c, c_len); }
 173
 174 FPUT_SUB(1)
 175 FPUT_SUB(2)
 176 FPUT_SUB(4)
 177 FPUT_SUB(8)
 178
 179
 180 /* SUBROUTINE FLUSH(UNIT)
 181    INTEGER, INTENT(IN), OPTIONAL :: UNIT  */
 182
 183 extern void flush_i4 (GFC_INTEGER_4 *);
 184 export_proto(flush_i4);
 185
 186 void
 187 flush_i4 (GFC_INTEGER_4 *unit)
 188 {
 189   gfc_unit *us;
 190
 191   /* flush all streams */
 192   if (unit == NULL)
 193     flush_all_units ();
 194   else
 195     {
 196       us = find_unit (*unit);
 197       if (us != NULL)
 198         {
 199           sflush (us->s);
 200           unlock_unit (us);
 201         }
 202     }
 203 }
 204
 205
 206 extern void flush_i8 (GFC_INTEGER_8 *);
 207 export_proto(flush_i8);
 208
 209 void
 210 flush_i8 (GFC_INTEGER_8 *unit)
 211 {
 212   gfc_unit *us;
 213
 214   /* flush all streams */
 215   if (unit == NULL)
 216     flush_all_units ();
 217   else
 218     {
 219       us = find_unit (*unit);
 220       if (us != NULL)
 221         {
 222           sflush (us->s);
 223           unlock_unit (us);
 224         }
 225     }
 226 }
 227
 228 /* FSEEK intrinsic */
 229
 230 extern void fseek_sub (int *, GFC_IO_INT *, int *, int *);
 231 export_proto(fseek_sub);
 232
 233 void
 234 fseek_sub (int * unit, GFC_IO_INT * offset, int * whence, int * status)
 235 {
 236   gfc_unit * u = find_unit (*unit);
 237   ssize_t result = -1;
 238
 239   if (u != NULL && is_seekable(u->s))
 240     {
 241       result = sseek(u->s, *offset, *whence);
 242
 243       unlock_unit (u);
 244     }
 245
 246   if (status)
 247     *status = (result < 0 ? -1 : 0);
 248 }
 249
 250
 251
 252 /* FTELL intrinsic */
 253
 254 extern size_t PREFIX(ftell) (int *);
 255 export_proto_np(PREFIX(ftell));
 256
 257 size_t
 258 PREFIX(ftell) (int * unit)
 259 {
 260   gfc_unit * u = find_unit (*unit);
 261   size_t ret;
 262   if (u == NULL)
 263     return ((size_t) -1);
 264   ret = (size_t) stell (u->s);
 265   unlock_unit (u);
 266   return ret;
 267 }
 268
 269 #define FTELL_SUB(kind) \
 270   extern void ftell_i ## kind ## _sub (int *, GFC_INTEGER_ ## kind *); \
 271   export_proto(ftell_i ## kind ## _sub); \
 272   void \
 273   ftell_i ## kind ## _sub (int * unit, GFC_INTEGER_ ## kind * offset) \
 274   { \
 275     gfc_unit * u = find_unit (*unit); \
 276     if (u == NULL) \
 277       *offset = -1; \
 278     else \
 279       { \
 280         *offset = stell (u->s); \
 281         unlock_unit (u); \
 282       } \
 283   }
 284
 285 FTELL_SUB(1)
 286 FTELL_SUB(2)
 287 FTELL_SUB(4)
 288 FTELL_SUB(8)
 289
 290
 291
 292 /* LOGICAL FUNCTION ISATTY(UNIT)
 293    INTEGER, INTENT(IN) :: UNIT */
 294
 295 extern GFC_LOGICAL_4 isatty_l4 (int *);
 296 export_proto(isatty_l4);
 297
 298 GFC_LOGICAL_4
 299 isatty_l4 (int *unit)
 300 {
 301   gfc_unit *u;
 302   GFC_LOGICAL_4 ret = 0;
 303
 304   u = find_unit (*unit);
 305   if (u != NULL)
 306     {
 307       ret = (GFC_LOGICAL_4) stream_isatty (u->s);
 308       unlock_unit (u);
 309     }
 310   return ret;
 311 }
 312
 313
 314 extern GFC_LOGICAL_8 isatty_l8 (int *);
 315 export_proto(isatty_l8);
 316
 317 GFC_LOGICAL_8
 318 isatty_l8 (int *unit)
 319 {
 320   gfc_unit *u;
 321   GFC_LOGICAL_8 ret = 0;
 322
 323   u = find_unit (*unit);
 324   if (u != NULL)
 325     {
 326       ret = (GFC_LOGICAL_8) stream_isatty (u->s);
 327       unlock_unit (u);
 328     }
 329   return ret;
 330 }
 331
 332
 333 /* SUBROUTINE TTYNAM(UNIT,NAME)
 334    INTEGER,SCALAR,INTENT(IN) :: UNIT
 335    CHARACTER,SCALAR,INTENT(OUT) :: NAME */
 336
 337 extern void ttynam_sub (int *, char *, gfc_charlen_type);
 338 export_proto(ttynam_sub);
 339
 340 void
 341 ttynam_sub (int *unit, char * name, gfc_charlen_type name_len)
 342 {
 343   gfc_unit *u;
 344   char * n;
 345   int i;
 346
 347   memset (name, ' ', name_len);
 348   u = find_unit (*unit);
 349   if (u != NULL)
 350     {
 351       n = stream_ttyname (u->s);
 352       if (n != NULL)
 353         {
 354           i = 0;
 355           while (*n && i < name_len)
 356             name[i++] = *(n++);
 357         }
 358       unlock_unit (u);
 359     }
 360 }
 361
 362
 363 extern void ttynam (char **, gfc_charlen_type *, int);
 364 export_proto(ttynam);
 365
 366 void
 367 ttynam (char ** name, gfc_charlen_type * name_len, int unit)
 368 {
 369   gfc_unit *u;
 370
 371   u = find_unit (unit);
 372   if (u != NULL)
 373     {
 374       *name = stream_ttyname (u->s);
 375       if (*name != NULL)
 376         {
 377           *name_len = strlen (*name);
 378           *name = strdup (*name);
 379           unlock_unit (u);
 380           return;
 381         }
 382       unlock_unit (u);
 383     }
 384
 385   *name_len = 0;
 386   *name = NULL;
 387 }