1 /* Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
2 Free Software Foundation, Inc.
3 Contributed by Andy Vaught
4 F2003 I/O support contributed by Jerry DeLisle
6 This file is part of the GNU Fortran runtime library (libgfortran).
8 Libgfortran is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3, or (at your option)
13 Libgfortran is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 Under Section 7 of GPL version 3, you are granted additional
19 permissions described in the GCC Runtime Library Exception, version
20 3.1, as published by the Free Software Foundation.
22 You should have received a copy of the GNU General Public License and
23 a copy of the GCC Runtime Library Exception along with this program;
24 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
25 <http://www.gnu.org/licenses/>. */
27 /* Unix stream I/O module */
43 /* For mingw, we don't identify files by their inode number, but by a
44 64-bit identifier created from a BY_HANDLE_FILE_INFORMATION. */
47 #define WIN32_LEAN_AND_MEAN
50 #define lseek _lseeki64
51 #define fstat _fstati64
53 typedef struct _stati64 gfstat_t;
55 #ifndef HAVE_WORKING_STAT
57 id_from_handle (HANDLE hFile)
59 BY_HANDLE_FILE_INFORMATION FileInformation;
61 if (hFile == INVALID_HANDLE_VALUE)
64 memset (&FileInformation, 0, sizeof(FileInformation));
65 if (!GetFileInformationByHandle (hFile, &FileInformation))
68 return ((uint64_t) FileInformation.nFileIndexLow)
69 | (((uint64_t) FileInformation.nFileIndexHigh) << 32);
74 id_from_path (const char *path)
79 if (!path || !*path || access (path, F_OK))
82 hFile = CreateFile (path, 0, 0, NULL, OPEN_EXISTING,
83 FILE_FLAG_BACKUP_SEMANTICS | FILE_ATTRIBUTE_READONLY,
85 res = id_from_handle (hFile);
92 id_from_fd (const int fd)
94 return id_from_handle ((HANDLE) _get_osfhandle (fd));
100 typedef struct stat gfstat_t;
104 #define PATH_MAX 1024
107 /* These flags aren't defined on all targets (mingw32), so provide them
140 /* Fallback implementation of access() on systems that don't have it.
141 Only modes R_OK, W_OK and F_OK are used in this file. */
144 fallback_access (const char *path, int mode)
146 if ((mode & R_OK) && open (path, O_RDONLY) < 0)
149 if ((mode & W_OK) && open (path, O_WRONLY) < 0)
155 return stat (path, &st);
162 #define access fallback_access
166 /* Unix and internal stream I/O module */
168 static const int BUFFER_SIZE = 8192;
174 gfc_offset buffer_offset; /* File offset of the start of the buffer */
175 gfc_offset physical_offset; /* Current physical file offset */
176 gfc_offset logical_offset; /* Current logical file offset */
177 gfc_offset file_length; /* Length of the file, -1 if not seekable. */
179 char *buffer; /* Pointer to the buffer. */
180 int fd; /* The POSIX file descriptor. */
182 int active; /* Length of valid bytes in the buffer */
184 int ndirty; /* Dirty bytes starting at buffer_offset */
186 int special_file; /* =1 if the fd refers to a special file */
191 /* fix_fd()-- Given a file descriptor, make sure it is not one of the
192 * standard descriptors, returning a non-standard descriptor. If the
193 * user specifies that system errors should go to standard output,
194 * then closes standard output, we don't want the system errors to a
195 * file that has been given file descriptor 1 or 0. We want to send
196 * the error to the invalid descriptor. */
202 int input, output, error;
204 input = output = error = 0;
206 /* Unix allocates the lowest descriptors first, so a loop is not
207 required, but this order is. */
208 if (fd == STDIN_FILENO)
213 if (fd == STDOUT_FILENO)
218 if (fd == STDERR_FILENO)
225 close (STDIN_FILENO);
227 close (STDOUT_FILENO);
229 close (STDERR_FILENO);
236 /* If the stream corresponds to a preconnected unit, we flush the
237 corresponding C stream. This is bugware for mixed C-Fortran codes
238 where the C code doesn't flush I/O before returning. */
240 flush_if_preconnected (stream * s)
244 fd = ((unix_stream *) s)->fd;
245 if (fd == STDIN_FILENO)
247 else if (fd == STDOUT_FILENO)
249 else if (fd == STDERR_FILENO)
254 /* get_oserror()-- Get the most recent operating system error. For
255 * unix, this is errno. */
260 return strerror (errno);
264 /********************************************************************
265 Raw I/O functions (read, write, seek, tell, truncate, close).
267 These functions wrap the basic POSIX I/O syscalls. Any deviation in
268 semantics is a bug, except the following: write restarts in case
269 of being interrupted by a signal, and as the first argument the
270 functions take the unix_stream struct rather than an integer file
271 descriptor. Also, for POSIX read() and write() a nbyte argument larger
272 than SSIZE_MAX is undefined; here the type of nbyte is ssize_t rather
273 than size_t as for POSIX read/write.
274 *********************************************************************/
277 raw_flush (unix_stream * s __attribute__ ((unused)))
283 raw_read (unix_stream * s, void * buf, ssize_t nbyte)
285 /* For read we can't do I/O in a loop like raw_write does, because
286 that will break applications that wait for interactive I/O. */
287 return read (s->fd, buf, nbyte);
291 raw_write (unix_stream * s, const void * buf, ssize_t nbyte)
293 ssize_t trans, bytes_left;
297 buf_st = (char *) buf;
299 /* We must write in a loop since some systems don't restart system
300 calls in case of a signal. */
301 while (bytes_left > 0)
303 trans = write (s->fd, buf_st, bytes_left);
315 return nbyte - bytes_left;
319 raw_seek (unix_stream * s, gfc_offset offset, int whence)
321 return lseek (s->fd, offset, whence);
325 raw_tell (unix_stream * s)
327 return lseek (s->fd, 0, SEEK_CUR);
331 raw_truncate (unix_stream * s, gfc_offset length)
342 h = (HANDLE) _get_osfhandle (s->fd);
343 if (h == INVALID_HANDLE_VALUE)
348 cur = lseek (s->fd, 0, SEEK_CUR);
351 if (lseek (s->fd, length, SEEK_SET) == -1)
353 if (!SetEndOfFile (h))
358 if (lseek (s->fd, cur, SEEK_SET) == -1)
362 lseek (s->fd, cur, SEEK_SET);
364 #elif defined HAVE_FTRUNCATE
365 return ftruncate (s->fd, length);
366 #elif defined HAVE_CHSIZE
367 return chsize (s->fd, length);
369 runtime_error ("required ftruncate or chsize support not present");
375 raw_close (unix_stream * s)
379 if (s->fd != STDOUT_FILENO
380 && s->fd != STDERR_FILENO
381 && s->fd != STDIN_FILENO)
382 retval = close (s->fd);
390 raw_init (unix_stream * s)
392 s->st.read = (void *) raw_read;
393 s->st.write = (void *) raw_write;
394 s->st.seek = (void *) raw_seek;
395 s->st.tell = (void *) raw_tell;
396 s->st.trunc = (void *) raw_truncate;
397 s->st.close = (void *) raw_close;
398 s->st.flush = (void *) raw_flush;
405 /*********************************************************************
406 Buffered I/O functions. These functions have the same semantics as the
407 raw I/O functions above, except that they are buffered in order to
408 improve performance. The buffer must be flushed when switching from
409 reading to writing and vice versa.
410 *********************************************************************/
413 buf_flush (unix_stream * s)
417 /* Flushing in read mode means discarding read bytes. */
423 if (s->file_length != -1 && s->physical_offset != s->buffer_offset
424 && lseek (s->fd, s->buffer_offset, SEEK_SET) < 0)
427 writelen = raw_write (s, s->buffer, s->ndirty);
429 s->physical_offset = s->buffer_offset + writelen;
431 /* Don't increment file_length if the file is non-seekable. */
432 if (s->file_length != -1 && s->physical_offset > s->file_length)
433 s->file_length = s->physical_offset;
435 s->ndirty -= writelen;
447 buf_read (unix_stream * s, void * buf, ssize_t nbyte)
450 s->buffer_offset = s->logical_offset;
452 /* Is the data we want in the buffer? */
453 if (s->logical_offset + nbyte <= s->buffer_offset + s->active
454 && s->buffer_offset <= s->logical_offset)
455 memcpy (buf, s->buffer + (s->logical_offset - s->buffer_offset), nbyte);
458 /* First copy the active bytes if applicable, then read the rest
459 either directly or filling the buffer. */
462 ssize_t to_read, did_read;
463 gfc_offset new_logical;
466 if (s->logical_offset >= s->buffer_offset
467 && s->buffer_offset + s->active >= s->logical_offset)
469 nread = s->active - (s->logical_offset - s->buffer_offset);
470 memcpy (buf, s->buffer + (s->logical_offset - s->buffer_offset),
474 /* At this point we consider all bytes in the buffer discarded. */
475 to_read = nbyte - nread;
476 new_logical = s->logical_offset + nread;
477 if (s->file_length != -1 && s->physical_offset != new_logical
478 && lseek (s->fd, new_logical, SEEK_SET) < 0)
480 s->buffer_offset = s->physical_offset = new_logical;
481 if (to_read <= BUFFER_SIZE/2)
483 did_read = raw_read (s, s->buffer, BUFFER_SIZE);
484 s->physical_offset += did_read;
485 s->active = did_read;
486 did_read = (did_read > to_read) ? to_read : did_read;
487 memcpy (p, s->buffer, did_read);
491 did_read = raw_read (s, p, to_read);
492 s->physical_offset += did_read;
495 nbyte = did_read + nread;
497 s->logical_offset += nbyte;
502 buf_write (unix_stream * s, const void * buf, ssize_t nbyte)
505 s->buffer_offset = s->logical_offset;
507 /* Does the data fit into the buffer? As a special case, if the
508 buffer is empty and the request is bigger than BUFFER_SIZE/2,
509 write directly. This avoids the case where the buffer would have
510 to be flushed at every write. */
511 if (!(s->ndirty == 0 && nbyte > BUFFER_SIZE/2)
512 && s->logical_offset + nbyte <= s->buffer_offset + BUFFER_SIZE
513 && s->buffer_offset <= s->logical_offset
514 && s->buffer_offset + s->ndirty >= s->logical_offset)
516 memcpy (s->buffer + (s->logical_offset - s->buffer_offset), buf, nbyte);
517 int nd = (s->logical_offset - s->buffer_offset) + nbyte;
523 /* Flush, and either fill the buffer with the new data, or if
524 the request is bigger than the buffer size, write directly
525 bypassing the buffer. */
527 if (nbyte <= BUFFER_SIZE/2)
529 memcpy (s->buffer, buf, nbyte);
530 s->buffer_offset = s->logical_offset;
535 if (s->file_length != -1 && s->physical_offset != s->logical_offset)
537 if (lseek (s->fd, s->logical_offset, SEEK_SET) < 0)
539 s->physical_offset = s->logical_offset;
542 nbyte = raw_write (s, buf, nbyte);
543 s->physical_offset += nbyte;
546 s->logical_offset += nbyte;
547 /* Don't increment file_length if the file is non-seekable. */
548 if (s->file_length != -1 && s->logical_offset > s->file_length)
549 s->file_length = s->logical_offset;
554 buf_seek (unix_stream * s, gfc_offset offset, int whence)
561 offset += s->logical_offset;
564 offset += s->file_length;
574 s->logical_offset = offset;
579 buf_tell (unix_stream * s)
581 return s->logical_offset;
585 buf_truncate (unix_stream * s, gfc_offset length)
589 if (buf_flush (s) != 0)
591 r = raw_truncate (s, length);
593 s->file_length = length;
598 buf_close (unix_stream * s)
600 if (buf_flush (s) != 0)
603 return raw_close (s);
607 buf_init (unix_stream * s)
609 s->st.read = (void *) buf_read;
610 s->st.write = (void *) buf_write;
611 s->st.seek = (void *) buf_seek;
612 s->st.tell = (void *) buf_tell;
613 s->st.trunc = (void *) buf_truncate;
614 s->st.close = (void *) buf_close;
615 s->st.flush = (void *) buf_flush;
617 s->buffer = get_mem (BUFFER_SIZE);
622 /*********************************************************************
623 memory stream functions - These are used for internal files
625 The idea here is that a single stream structure is created and all
626 requests must be satisfied from it. The location and size of the
627 buffer is the character variable supplied to the READ or WRITE
630 *********************************************************************/
633 mem_alloc_r (stream * strm, int * len)
635 unix_stream * s = (unix_stream *) strm;
637 gfc_offset where = s->logical_offset;
639 if (where < s->buffer_offset || where > s->buffer_offset + s->active)
642 n = s->buffer_offset + s->active - where;
646 s->logical_offset = where + *len;
648 return s->buffer + (where - s->buffer_offset);
653 mem_alloc_r4 (stream * strm, int * len)
655 unix_stream * s = (unix_stream *) strm;
657 gfc_offset where = s->logical_offset;
659 if (where < s->buffer_offset || where > s->buffer_offset + s->active)
662 n = s->buffer_offset + s->active - where;
666 s->logical_offset = where + *len;
668 return s->buffer + (where - s->buffer_offset) * 4;
673 mem_alloc_w (stream * strm, int * len)
675 unix_stream * s = (unix_stream *) strm;
677 gfc_offset where = s->logical_offset;
681 if (where < s->buffer_offset)
684 if (m > s->file_length)
687 s->logical_offset = m;
689 return s->buffer + (where - s->buffer_offset);
694 mem_alloc_w4 (stream * strm, int * len)
696 unix_stream * s = (unix_stream *) strm;
698 gfc_offset where = s->logical_offset;
699 gfc_char4_t *result = (gfc_char4_t *) s->buffer;
703 if (where < s->buffer_offset)
706 if (m > s->file_length)
709 s->logical_offset = m;
710 return &result[where - s->buffer_offset];
714 /* Stream read function for character(kine=1) internal units. */
717 mem_read (stream * s, void * buf, ssize_t nbytes)
722 p = mem_alloc_r (s, &nb);
733 /* Stream read function for chracter(kind=4) internal units. */
736 mem_read4 (stream * s, void * buf, ssize_t nbytes)
741 p = mem_alloc_r (s, &nb);
752 /* Stream write function for character(kind=1) internal units. */
755 mem_write (stream * s, const void * buf, ssize_t nbytes)
760 p = mem_alloc_w (s, &nb);
771 /* Stream write function for character(kind=4) internal units. */
774 mem_write4 (stream * s, const void * buf, ssize_t nwords)
779 p = mem_alloc_w4 (s, &nw);
783 *p++ = (gfc_char4_t) *((char *) buf);
792 mem_seek (stream * strm, gfc_offset offset, int whence)
794 unix_stream * s = (unix_stream *) strm;
800 offset += s->logical_offset;
803 offset += s->file_length;
809 /* Note that for internal array I/O it's actually possible to have a
810 negative offset, so don't check for that. */
811 if (offset > s->file_length)
817 s->logical_offset = offset;
819 /* Returning < 0 is the error indicator for sseek(), so return 0 if
820 offset is negative. Thus if the return value is 0, the caller
821 has to use stell() to get the real value of logical_offset. */
829 mem_tell (stream * s)
831 return ((unix_stream *)s)->logical_offset;
836 mem_truncate (unix_stream * s __attribute__ ((unused)),
837 gfc_offset length __attribute__ ((unused)))
844 mem_flush (unix_stream * s __attribute__ ((unused)))
851 mem_close (unix_stream * s)
860 /*********************************************************************
861 Public functions -- A reimplementation of this module needs to
862 define functional equivalents of the following.
863 *********************************************************************/
865 /* open_internal()-- Returns a stream structure from a character(kind=1)
869 open_internal (char *base, int length, gfc_offset offset)
873 s = get_mem (sizeof (unix_stream));
874 memset (s, '\0', sizeof (unix_stream));
877 s->buffer_offset = offset;
879 s->logical_offset = 0;
880 s->active = s->file_length = length;
882 s->st.close = (void *) mem_close;
883 s->st.seek = (void *) mem_seek;
884 s->st.tell = (void *) mem_tell;
885 s->st.trunc = (void *) mem_truncate;
886 s->st.read = (void *) mem_read;
887 s->st.write = (void *) mem_write;
888 s->st.flush = (void *) mem_flush;
893 /* open_internal4()-- Returns a stream structure from a character(kind=4)
897 open_internal4 (char *base, int length, gfc_offset offset)
901 s = get_mem (sizeof (unix_stream));
902 memset (s, '\0', sizeof (unix_stream));
905 s->buffer_offset = offset;
907 s->logical_offset = 0;
908 s->active = s->file_length = length;
910 s->st.close = (void *) mem_close;
911 s->st.seek = (void *) mem_seek;
912 s->st.tell = (void *) mem_tell;
913 s->st.trunc = (void *) mem_truncate;
914 s->st.read = (void *) mem_read4;
915 s->st.write = (void *) mem_write4;
916 s->st.flush = (void *) mem_flush;
922 /* fd_to_stream()-- Given an open file descriptor, build a stream
926 fd_to_stream (int fd)
931 s = get_mem (sizeof (unix_stream));
932 memset (s, '\0', sizeof (unix_stream));
935 s->buffer_offset = 0;
936 s->physical_offset = 0;
937 s->logical_offset = 0;
939 /* Get the current length of the file. */
941 fstat (fd, &statbuf);
943 if (lseek (fd, 0, SEEK_CUR) == (gfc_offset) -1)
946 s->file_length = S_ISREG (statbuf.st_mode) ? statbuf.st_size : -1;
948 s->special_file = !S_ISREG (statbuf.st_mode);
950 if (isatty (s->fd) || options.all_unbuffered
951 ||(options.unbuffered_preconnected &&
952 (s->fd == STDIN_FILENO
953 || s->fd == STDOUT_FILENO
954 || s->fd == STDERR_FILENO)))
963 /* Given the Fortran unit number, convert it to a C file descriptor. */
966 unit_to_fd (int unit)
971 us = find_unit (unit);
975 fd = ((unix_stream *) us->s)->fd;
981 /* unpack_filename()-- Given a fortran string and a pointer to a
982 * buffer that is PATH_MAX characters, convert the fortran string to a
983 * C string in the buffer. Returns nonzero if this is not possible. */
986 unpack_filename (char *cstring, const char *fstring, int len)
988 len = fstrlen (fstring, len);
992 memmove (cstring, fstring, len);
999 /* tempfile()-- Generate a temporary filename for a scratch file and
1000 * open it. mkstemp() opens the file for reading and writing, but the
1001 * library mode prevents anything that is not allowed. The descriptor
1002 * is returned, which is -1 on error. The template is pointed to by
1003 * opp->file, which is copied into the unit structure
1004 * and freed later. */
1007 tempfile (st_parameter_open *opp)
1009 const char *tempdir;
1011 const char *slash = "/";
1014 tempdir = getenv ("GFORTRAN_TMPDIR");
1016 if (tempdir == NULL)
1018 char buffer[MAX_PATH + 1];
1020 ret = GetTempPath (MAX_PATH, buffer);
1021 /* If we are not able to get a temp-directory, we use
1022 current directory. */
1023 if (ret > MAX_PATH || !ret)
1027 tempdir = strdup (buffer);
1030 if (tempdir == NULL)
1031 tempdir = getenv ("TMP");
1032 if (tempdir == NULL)
1033 tempdir = getenv ("TEMP");
1034 if (tempdir == NULL)
1035 tempdir = DEFAULT_TEMPDIR;
1037 /* Check for special case that tempdir contains slash
1038 or backslash at end. */
1039 if (*tempdir == 0 || tempdir[strlen (tempdir) - 1] == '/'
1041 || tempdir[strlen (tempdir) - 1] == '\\'
1046 template = get_mem (strlen (tempdir) + 20);
1049 sprintf (template, "%s%sgfortrantmpXXXXXX", tempdir, slash);
1051 fd = mkstemp (template);
1053 #else /* HAVE_MKSTEMP */
1057 sprintf (template, "%s%sgfortrantmpXXXXXX", tempdir, slash);
1058 if (!mktemp (template))
1060 #if defined(HAVE_CRLF) && defined(O_BINARY)
1061 fd = open (template, O_RDWR | O_CREAT | O_EXCL | O_BINARY,
1062 S_IREAD | S_IWRITE);
1064 fd = open (template, O_RDWR | O_CREAT | O_EXCL, S_IREAD | S_IWRITE);
1067 while (fd == -1 && errno == EEXIST);
1068 #endif /* HAVE_MKSTEMP */
1074 opp->file = template;
1075 opp->file_len = strlen (template); /* Don't include trailing nul */
1082 /* regular_file()-- Open a regular file.
1083 * Change flags->action if it is ACTION_UNSPECIFIED on entry,
1084 * unless an error occurs.
1085 * Returns the descriptor, which is less than zero on error. */
1088 regular_file (st_parameter_open *opp, unit_flags *flags)
1090 char path[PATH_MAX + 1];
1096 if (unpack_filename (path, opp->file, opp->file_len))
1098 errno = ENOENT; /* Fake an OS error */
1103 if (opp->file_len == 7)
1105 if (strncmp (path, "CONOUT$", 7) == 0
1106 || strncmp (path, "CONERR$", 7) == 0)
1108 fd = open ("/dev/conout", O_WRONLY);
1109 flags->action = ACTION_WRITE;
1114 if (opp->file_len == 6 && strncmp (path, "CONIN$", 6) == 0)
1116 fd = open ("/dev/conin", O_RDONLY);
1117 flags->action = ACTION_READ;
1124 if (opp->file_len == 7)
1126 if (strncmp (path, "CONOUT$", 7) == 0
1127 || strncmp (path, "CONERR$", 7) == 0)
1129 fd = open ("CONOUT$", O_WRONLY);
1130 flags->action = ACTION_WRITE;
1135 if (opp->file_len == 6 && strncmp (path, "CONIN$", 6) == 0)
1137 fd = open ("CONIN$", O_RDONLY);
1138 flags->action = ACTION_READ;
1145 switch (flags->action)
1155 case ACTION_READWRITE:
1156 case ACTION_UNSPECIFIED:
1161 internal_error (&opp->common, "regular_file(): Bad action");
1164 switch (flags->status)
1167 crflag = O_CREAT | O_EXCL;
1170 case STATUS_OLD: /* open will fail if the file does not exist*/
1174 case STATUS_UNKNOWN:
1175 case STATUS_SCRATCH:
1179 case STATUS_REPLACE:
1180 crflag = O_CREAT | O_TRUNC;
1184 internal_error (&opp->common, "regular_file(): Bad status");
1187 /* rwflag |= O_LARGEFILE; */
1189 #if defined(HAVE_CRLF) && defined(O_BINARY)
1193 mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH;
1194 fd = open (path, rwflag | crflag, mode);
1195 if (flags->action != ACTION_UNSPECIFIED)
1200 flags->action = ACTION_READWRITE;
1203 if (errno != EACCES && errno != EROFS)
1206 /* retry for read-only access */
1208 fd = open (path, rwflag | crflag, mode);
1211 flags->action = ACTION_READ;
1212 return fd; /* success */
1215 if (errno != EACCES)
1216 return fd; /* failure */
1218 /* retry for write-only access */
1220 fd = open (path, rwflag | crflag, mode);
1223 flags->action = ACTION_WRITE;
1224 return fd; /* success */
1226 return fd; /* failure */
1230 /* open_external()-- Open an external file, unix specific version.
1231 * Change flags->action if it is ACTION_UNSPECIFIED on entry.
1232 * Returns NULL on operating system error. */
1235 open_external (st_parameter_open *opp, unit_flags *flags)
1239 if (flags->status == STATUS_SCRATCH)
1241 fd = tempfile (opp);
1242 if (flags->action == ACTION_UNSPECIFIED)
1243 flags->action = ACTION_READWRITE;
1245 #if HAVE_UNLINK_OPEN_FILE
1246 /* We can unlink scratch files now and it will go away when closed. */
1253 /* regular_file resets flags->action if it is ACTION_UNSPECIFIED and
1255 fd = regular_file (opp, flags);
1262 return fd_to_stream (fd);
1266 /* input_stream()-- Return a stream pointer to the default input stream.
1267 * Called on initialization. */
1272 return fd_to_stream (STDIN_FILENO);
1276 /* output_stream()-- Return a stream pointer to the default output stream.
1277 * Called on initialization. */
1280 output_stream (void)
1284 #if defined(HAVE_CRLF) && defined(HAVE_SETMODE)
1285 setmode (STDOUT_FILENO, O_BINARY);
1288 s = fd_to_stream (STDOUT_FILENO);
1293 /* error_stream()-- Return a stream pointer to the default error stream.
1294 * Called on initialization. */
1301 #if defined(HAVE_CRLF) && defined(HAVE_SETMODE)
1302 setmode (STDERR_FILENO, O_BINARY);
1305 s = fd_to_stream (STDERR_FILENO);
1310 /* st_vprintf()-- vprintf function for error output. To avoid buffer
1311 overruns, we limit the length of the buffer to ST_VPRINTF_SIZE. 2k
1312 is big enough to completely fill a 80x25 terminal, so it shuld be
1313 OK. We use a direct write() because it is simpler and least likely
1314 to be clobbered by memory corruption. Writing an error message
1315 longer than that is an error. */
1317 #define ST_VPRINTF_SIZE 2048
1320 st_vprintf (const char *format, va_list ap)
1322 static char buffer[ST_VPRINTF_SIZE];
1326 fd = options.use_stderr ? STDERR_FILENO : STDOUT_FILENO;
1327 #ifdef HAVE_VSNPRINTF
1328 written = vsnprintf(buffer, ST_VPRINTF_SIZE, format, ap);
1330 written = vsprintf(buffer, format, ap);
1332 if (written >= ST_VPRINTF_SIZE-1)
1334 /* The error message was longer than our buffer. Ouch. Because
1335 we may have messed up things badly, report the error and
1337 #define ERROR_MESSAGE "Internal error: buffer overrun in st_vprintf()\n"
1338 write (fd, buffer, ST_VPRINTF_SIZE-1);
1339 write (fd, ERROR_MESSAGE, strlen(ERROR_MESSAGE));
1341 #undef ERROR_MESSAGE
1346 written = write (fd, buffer, written);
1350 /* st_printf()-- printf() function for error output. This just calls
1351 st_vprintf() to do the actual work. */
1354 st_printf (const char *format, ...)
1358 va_start (ap, format);
1359 written = st_vprintf(format, ap);
1365 /* compare_file_filename()-- Given an open stream and a fortran string
1366 * that is a filename, figure out if the file is the same as the
1370 compare_file_filename (gfc_unit *u, const char *name, int len)
1372 char path[PATH_MAX + 1];
1374 #ifdef HAVE_WORKING_STAT
1382 if (unpack_filename (path, name, len))
1383 return 0; /* Can't be the same */
1385 /* If the filename doesn't exist, then there is no match with the
1388 if (stat (path, &st1) < 0)
1391 #ifdef HAVE_WORKING_STAT
1392 fstat (((unix_stream *) (u->s))->fd, &st2);
1393 return (st1.st_dev == st2.st_dev) && (st1.st_ino == st2.st_ino);
1397 /* We try to match files by a unique ID. On some filesystems (network
1398 fs and FAT), we can't generate this unique ID, and will simply compare
1400 id1 = id_from_path (path);
1401 id2 = id_from_fd (((unix_stream *) (u->s))->fd);
1403 return (id1 == id2);
1406 if (len != u->file_len)
1408 return (memcmp(path, u->file, len) == 0);
1413 #ifdef HAVE_WORKING_STAT
1414 # define FIND_FILE0_DECL gfstat_t *st
1415 # define FIND_FILE0_ARGS st
1417 # define FIND_FILE0_DECL uint64_t id, const char *file, gfc_charlen_type file_len
1418 # define FIND_FILE0_ARGS id, file, file_len
1421 /* find_file0()-- Recursive work function for find_file() */
1424 find_file0 (gfc_unit *u, FIND_FILE0_DECL)
1427 #if defined(__MINGW32__) && !HAVE_WORKING_STAT
1434 #ifdef HAVE_WORKING_STAT
1436 && fstat (((unix_stream *) u->s)->fd, &st[1]) >= 0 &&
1437 st[0].st_dev == st[1].st_dev && st[0].st_ino == st[1].st_ino)
1441 if (u->s && ((id1 = id_from_fd (((unix_stream *) u->s)->fd)) || id1))
1448 if (compare_string (u->file_len, u->file, file_len, file) == 0)
1452 v = find_file0 (u->left, FIND_FILE0_ARGS);
1456 v = find_file0 (u->right, FIND_FILE0_ARGS);
1464 /* find_file()-- Take the current filename and see if there is a unit
1465 * that has the file already open. Returns a pointer to the unit if so. */
1468 find_file (const char *file, gfc_charlen_type file_len)
1470 char path[PATH_MAX + 1];
1473 #if defined(__MINGW32__) && !HAVE_WORKING_STAT
1477 if (unpack_filename (path, file, file_len))
1480 if (stat (path, &st[0]) < 0)
1483 #if defined(__MINGW32__) && !HAVE_WORKING_STAT
1484 id = id_from_path (path);
1487 __gthread_mutex_lock (&unit_lock);
1489 u = find_file0 (unit_root, FIND_FILE0_ARGS);
1493 if (! __gthread_mutex_trylock (&u->lock))
1495 /* assert (u->closed == 0); */
1496 __gthread_mutex_unlock (&unit_lock);
1500 inc_waiting_locked (u);
1502 __gthread_mutex_unlock (&unit_lock);
1505 __gthread_mutex_lock (&u->lock);
1508 __gthread_mutex_lock (&unit_lock);
1509 __gthread_mutex_unlock (&u->lock);
1510 if (predec_waiting_locked (u) == 0)
1515 dec_waiting_unlocked (u);
1521 flush_all_units_1 (gfc_unit *u, int min_unit)
1525 if (u->unit_number > min_unit)
1527 gfc_unit *r = flush_all_units_1 (u->left, min_unit);
1531 if (u->unit_number >= min_unit)
1533 if (__gthread_mutex_trylock (&u->lock))
1537 __gthread_mutex_unlock (&u->lock);
1545 flush_all_units (void)
1550 __gthread_mutex_lock (&unit_lock);
1553 u = flush_all_units_1 (unit_root, min_unit);
1555 inc_waiting_locked (u);
1556 __gthread_mutex_unlock (&unit_lock);
1560 __gthread_mutex_lock (&u->lock);
1562 min_unit = u->unit_number + 1;
1567 __gthread_mutex_lock (&unit_lock);
1568 __gthread_mutex_unlock (&u->lock);
1569 (void) predec_waiting_locked (u);
1573 __gthread_mutex_lock (&unit_lock);
1574 __gthread_mutex_unlock (&u->lock);
1575 if (predec_waiting_locked (u) == 0)
1583 /* delete_file()-- Given a unit structure, delete the file associated
1584 * with the unit. Returns nonzero if something went wrong. */
1587 delete_file (gfc_unit * u)
1589 char path[PATH_MAX + 1];
1591 if (unpack_filename (path, u->file, u->file_len))
1592 { /* Shouldn't be possible */
1597 return unlink (path);
1601 /* file_exists()-- Returns nonzero if the current filename exists on
1605 file_exists (const char *file, gfc_charlen_type file_len)
1607 char path[PATH_MAX + 1];
1609 if (unpack_filename (path, file, file_len))
1612 return !(access (path, F_OK));
1616 /* file_size()-- Returns the size of the file. */
1619 file_size (const char *file, gfc_charlen_type file_len)
1621 char path[PATH_MAX + 1];
1624 if (unpack_filename (path, file, file_len))
1627 if (stat (path, &statbuf) < 0)
1630 return (GFC_IO_INT) statbuf.st_size;
1633 static const char yes[] = "YES", no[] = "NO", unknown[] = "UNKNOWN";
1635 /* inquire_sequential()-- Given a fortran string, determine if the
1636 * file is suitable for sequential access. Returns a C-style
1640 inquire_sequential (const char *string, int len)
1642 char path[PATH_MAX + 1];
1645 if (string == NULL ||
1646 unpack_filename (path, string, len) || stat (path, &statbuf) < 0)
1649 if (S_ISREG (statbuf.st_mode) ||
1650 S_ISCHR (statbuf.st_mode) || S_ISFIFO (statbuf.st_mode))
1653 if (S_ISDIR (statbuf.st_mode) || S_ISBLK (statbuf.st_mode))
1660 /* inquire_direct()-- Given a fortran string, determine if the file is
1661 * suitable for direct access. Returns a C-style string. */
1664 inquire_direct (const char *string, int len)
1666 char path[PATH_MAX + 1];
1669 if (string == NULL ||
1670 unpack_filename (path, string, len) || stat (path, &statbuf) < 0)
1673 if (S_ISREG (statbuf.st_mode) || S_ISBLK (statbuf.st_mode))
1676 if (S_ISDIR (statbuf.st_mode) ||
1677 S_ISCHR (statbuf.st_mode) || S_ISFIFO (statbuf.st_mode))
1684 /* inquire_formatted()-- Given a fortran string, determine if the file
1685 * is suitable for formatted form. Returns a C-style string. */
1688 inquire_formatted (const char *string, int len)
1690 char path[PATH_MAX + 1];
1693 if (string == NULL ||
1694 unpack_filename (path, string, len) || stat (path, &statbuf) < 0)
1697 if (S_ISREG (statbuf.st_mode) ||
1698 S_ISBLK (statbuf.st_mode) ||
1699 S_ISCHR (statbuf.st_mode) || S_ISFIFO (statbuf.st_mode))
1702 if (S_ISDIR (statbuf.st_mode))
1709 /* inquire_unformatted()-- Given a fortran string, determine if the file
1710 * is suitable for unformatted form. Returns a C-style string. */
1713 inquire_unformatted (const char *string, int len)
1715 return inquire_formatted (string, len);
1719 /* inquire_access()-- Given a fortran string, determine if the file is
1720 * suitable for access. */
1723 inquire_access (const char *string, int len, int mode)
1725 char path[PATH_MAX + 1];
1727 if (string == NULL || unpack_filename (path, string, len) ||
1728 access (path, mode) < 0)
1735 /* inquire_read()-- Given a fortran string, determine if the file is
1736 * suitable for READ access. */
1739 inquire_read (const char *string, int len)
1741 return inquire_access (string, len, R_OK);
1745 /* inquire_write()-- Given a fortran string, determine if the file is
1746 * suitable for READ access. */
1749 inquire_write (const char *string, int len)
1751 return inquire_access (string, len, W_OK);
1755 /* inquire_readwrite()-- Given a fortran string, determine if the file is
1756 * suitable for read and write access. */
1759 inquire_readwrite (const char *string, int len)
1761 return inquire_access (string, len, R_OK | W_OK);
1765 /* file_length()-- Return the file length in bytes, -1 if unknown */
1768 file_length (stream * s)
1770 gfc_offset curr, end;
1771 if (!is_seekable (s))
1776 end = sseek (s, 0, SEEK_END);
1777 sseek (s, curr, SEEK_SET);
1782 /* is_seekable()-- Return nonzero if the stream is seekable, zero if
1786 is_seekable (stream *s)
1788 /* By convention, if file_length == -1, the file is not
1790 return ((unix_stream *) s)->file_length!=-1;
1794 /* is_special()-- Return nonzero if the stream is not a regular file. */
1797 is_special (stream *s)
1799 return ((unix_stream *) s)->special_file;
1804 stream_isatty (stream *s)
1806 return isatty (((unix_stream *) s)->fd);
1811 stream_ttyname (stream *s)
1813 return ttyname (((unix_stream *) s)->fd);
1816 stream_ttyname (stream *s __attribute__ ((unused)))
1824 /* How files are stored: This is an operating-system specific issue,
1825 and therefore belongs here. There are three cases to consider.
1828 Records are written as block of bytes corresponding to the record
1829 length of the file. This goes for both formatted and unformatted
1830 records. Positioning is done explicitly for each data transfer,
1831 so positioning is not much of an issue.
1833 Sequential Formatted:
1834 Records are separated by newline characters. The newline character
1835 is prohibited from appearing in a string. If it does, this will be
1836 messed up on the next read. End of file is also the end of a record.
1838 Sequential Unformatted:
1839 In this case, we are merely copying bytes to and from main storage,
1840 yet we need to keep track of varying record lengths. We adopt
1841 the solution used by f2c. Each record contains a pair of length
1844 Length of record n in bytes
1846 Length of record n in bytes
1848 Length of record n+1 in bytes
1850 Length of record n+1 in bytes
1852 The length is stored at the end of a record to allow backspacing to the
1853 previous record. Between data transfer statements, the file pointer
1854 is left pointing to the first length of the current record.
1856 ENDFILE records are never explicitly stored.