619 lines
15 KiB
C
619 lines
15 KiB
C
/* Copyright (C) 2002, 2003, 2005, 2006, 2007, 2009, 2010, 2011
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Free Software Foundation, Inc.
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Contributed by Andy Vaught
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This file is part of the GNU Fortran runtime library (libgfortran).
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Libgfortran is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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Libgfortran is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#include "libgfortran.h"
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#include <assert.h>
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#include <string.h>
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#include <errno.h>
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#include <signal.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <stdlib.h>
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#ifdef HAVE_SYS_TIME_H
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#include <sys/time.h>
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#endif
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/* <sys/time.h> has to be included before <sys/resource.h> to work
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around PR 30518; otherwise, MacOS 10.3.9 headers are just broken. */
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#ifdef HAVE_SYS_RESOURCE_H
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#include <sys/resource.h>
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#endif
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#ifdef __MINGW32__
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#define HAVE_GETPID 1
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#include <process.h>
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#endif
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/* Termination of a program: F2008 2.3.5 talks about "normal
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termination" and "error termination". Normal termination occurs as
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a result of e.g. executing the end program statement, and executing
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the STOP statement. It includes the effect of the C exit()
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function.
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Error termination is initiated when the ERROR STOP statement is
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executed, when ALLOCATE/DEALLOCATE fails without STAT= being
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specified, when some of the co-array synchronization statements
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fail without STAT= being specified, and some I/O errors if
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ERR/IOSTAT/END/EOR is not present, and finally EXECUTE_COMMAND_LINE
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failure without CMDSTAT=.
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2.3.5 also explains how co-images synchronize during termination.
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In libgfortran we have two ways of ending a program. exit(code) is
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a normal exit; calling exit() also causes open units to be
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closed. No backtrace or core dump is needed here. When something
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goes wrong, we have sys_abort() which tries to print the backtrace
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if -fbacktrace is enabled, and then dumps core; whether a core file
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is generated is system dependent. When aborting, we don't flush and
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close open units, as program memory might be corrupted and we'd
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rather risk losing dirty data in the buffers rather than corrupting
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files on disk.
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*/
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/* Error conditions. The tricky part here is printing a message when
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* it is the I/O subsystem that is severely wounded. Our goal is to
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* try and print something making the fewest assumptions possible,
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* then try to clean up before actually exiting.
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*
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* The following exit conditions are defined:
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* 0 Normal program exit.
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* 1 Terminated because of operating system error.
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* 2 Error in the runtime library
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* 3 Internal error in runtime library
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*
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* Other error returns are reserved for the STOP statement with a numeric code.
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*/
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/* Write a null-terminated C string to standard error. This function
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is async-signal-safe. */
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ssize_t
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estr_write (const char *str)
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{
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return write (STDERR_FILENO, str, strlen (str));
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}
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/* st_vprintf()-- vsnprintf-like function for error output. We use a
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stack allocated buffer for formatting; since this function might be
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called from within a signal handler, printing directly to stderr
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with vfprintf is not safe since the stderr locking might lead to a
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deadlock. */
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#define ST_VPRINTF_SIZE 512
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int
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st_vprintf (const char *format, va_list ap)
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{
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int written;
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char buffer[ST_VPRINTF_SIZE];
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#ifdef HAVE_VSNPRINTF
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written = vsnprintf(buffer, ST_VPRINTF_SIZE, format, ap);
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#else
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written = vsprintf(buffer, format, ap);
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if (written >= ST_VPRINTF_SIZE - 1)
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{
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/* The error message was longer than our buffer. Ouch. Because
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we may have messed up things badly, report the error and
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quit. */
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#define ERROR_MESSAGE "Internal error: buffer overrun in st_vprintf()\n"
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write (STDERR_FILENO, buffer, ST_VPRINTF_SIZE - 1);
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write (STDERR_FILENO, ERROR_MESSAGE, strlen(ERROR_MESSAGE));
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sys_abort ();
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#undef ERROR_MESSAGE
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}
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#endif
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written = write (STDERR_FILENO, buffer, written);
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return written;
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}
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int
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st_printf (const char * format, ...)
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{
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int written;
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va_list ap;
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va_start (ap, format);
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written = st_vprintf (format, ap);
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va_end (ap);
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return written;
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}
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/* sys_abort()-- Terminate the program showing backtrace and dumping
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core. */
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void
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sys_abort (void)
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{
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/* If backtracing is enabled, print backtrace and disable signal
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handler for ABRT. */
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if (options.backtrace == 1
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|| (options.backtrace == -1 && compile_options.backtrace == 1))
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{
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show_backtrace ();
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signal (SIGABRT, SIG_DFL);
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}
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abort();
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}
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/* gfc_xtoa()-- Integer to hexadecimal conversion. */
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const char *
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gfc_xtoa (GFC_UINTEGER_LARGEST n, char *buffer, size_t len)
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{
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int digit;
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char *p;
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assert (len >= GFC_XTOA_BUF_SIZE);
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if (n == 0)
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return "0";
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p = buffer + GFC_XTOA_BUF_SIZE - 1;
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*p = '\0';
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while (n != 0)
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{
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digit = n & 0xF;
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if (digit > 9)
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digit += 'A' - '0' - 10;
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*--p = '0' + digit;
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n >>= 4;
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}
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return p;
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}
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/* Hopefully thread-safe wrapper for a strerror_r() style function. */
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char *
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gf_strerror (int errnum,
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char * buf __attribute__((unused)),
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size_t buflen __attribute__((unused)))
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{
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#ifdef HAVE_STRERROR_R
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/* POSIX returns an "int", GNU a "char*". */
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return
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__builtin_choose_expr (__builtin_classify_type (strerror_r (0, buf, 0))
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== 5,
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/* GNU strerror_r() */
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strerror_r (errnum, buf, buflen),
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/* POSIX strerror_r () */
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(strerror_r (errnum, buf, buflen), buf));
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#elif defined(HAVE_STRERROR_R_2ARGS)
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strerror_r (errnum, buf);
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return buf;
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#else
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/* strerror () is not necessarily thread-safe, but should at least
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be available everywhere. */
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return strerror (errnum);
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#endif
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}
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/* show_locus()-- Print a line number and filename describing where
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* something went wrong */
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void
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show_locus (st_parameter_common *cmp)
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{
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char *filename;
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if (!options.locus || cmp == NULL || cmp->filename == NULL)
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return;
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if (cmp->unit > 0)
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{
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filename = filename_from_unit (cmp->unit);
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if (filename != NULL)
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{
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st_printf ("At line %d of file %s (unit = %d, file = '%s')\n",
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(int) cmp->line, cmp->filename, (int) cmp->unit, filename);
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free (filename);
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}
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else
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{
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st_printf ("At line %d of file %s (unit = %d)\n",
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(int) cmp->line, cmp->filename, (int) cmp->unit);
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}
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return;
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}
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st_printf ("At line %d of file %s\n", (int) cmp->line, cmp->filename);
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}
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/* recursion_check()-- It's possible for additional errors to occur
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* during fatal error processing. We detect this condition here and
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* exit with code 4 immediately. */
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#define MAGIC 0x20DE8101
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static void
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recursion_check (void)
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{
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static int magic = 0;
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/* Don't even try to print something at this point */
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if (magic == MAGIC)
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sys_abort ();
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magic = MAGIC;
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}
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#define STRERR_MAXSZ 256
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/* os_error()-- Operating system error. We get a message from the
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* operating system, show it and leave. Some operating system errors
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* are caught and processed by the library. If not, we come here. */
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void
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os_error (const char *message)
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{
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char errmsg[STRERR_MAXSZ];
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recursion_check ();
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estr_write ("Operating system error: ");
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estr_write (gf_strerror (errno, errmsg, STRERR_MAXSZ));
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estr_write ("\n");
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estr_write (message);
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estr_write ("\n");
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exit (1);
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}
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iexport(os_error);
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/* void runtime_error()-- These are errors associated with an
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* invalid fortran program. */
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void
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runtime_error (const char *message, ...)
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{
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va_list ap;
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recursion_check ();
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estr_write ("Fortran runtime error: ");
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va_start (ap, message);
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st_vprintf (message, ap);
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va_end (ap);
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estr_write ("\n");
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exit (2);
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}
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iexport(runtime_error);
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/* void runtime_error_at()-- These are errors associated with a
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* run time error generated by the front end compiler. */
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void
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runtime_error_at (const char *where, const char *message, ...)
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{
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va_list ap;
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recursion_check ();
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estr_write (where);
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estr_write ("\nFortran runtime error: ");
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va_start (ap, message);
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st_vprintf (message, ap);
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va_end (ap);
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estr_write ("\n");
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exit (2);
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}
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iexport(runtime_error_at);
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void
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runtime_warning_at (const char *where, const char *message, ...)
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{
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va_list ap;
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estr_write (where);
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estr_write ("\nFortran runtime warning: ");
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va_start (ap, message);
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st_vprintf (message, ap);
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va_end (ap);
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estr_write ("\n");
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}
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iexport(runtime_warning_at);
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/* void internal_error()-- These are this-can't-happen errors
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* that indicate something deeply wrong. */
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void
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internal_error (st_parameter_common *cmp, const char *message)
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{
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recursion_check ();
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show_locus (cmp);
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estr_write ("Internal Error: ");
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estr_write (message);
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estr_write ("\n");
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/* This function call is here to get the main.o object file included
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when linking statically. This works because error.o is supposed to
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be always linked in (and the function call is in internal_error
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because hopefully it doesn't happen too often). */
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stupid_function_name_for_static_linking();
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exit (3);
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}
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/* translate_error()-- Given an integer error code, return a string
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* describing the error. */
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const char *
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translate_error (int code)
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{
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const char *p;
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switch (code)
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{
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case LIBERROR_EOR:
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p = "End of record";
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break;
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case LIBERROR_END:
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p = "End of file";
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break;
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case LIBERROR_OK:
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p = "Successful return";
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break;
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case LIBERROR_OS:
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p = "Operating system error";
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break;
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case LIBERROR_BAD_OPTION:
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p = "Bad statement option";
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break;
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case LIBERROR_MISSING_OPTION:
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p = "Missing statement option";
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break;
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case LIBERROR_OPTION_CONFLICT:
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p = "Conflicting statement options";
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break;
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case LIBERROR_ALREADY_OPEN:
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p = "File already opened in another unit";
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break;
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case LIBERROR_BAD_UNIT:
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p = "Unattached unit";
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break;
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case LIBERROR_FORMAT:
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p = "FORMAT error";
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break;
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case LIBERROR_BAD_ACTION:
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p = "Incorrect ACTION specified";
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break;
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case LIBERROR_ENDFILE:
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p = "Read past ENDFILE record";
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break;
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case LIBERROR_BAD_US:
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p = "Corrupt unformatted sequential file";
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break;
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case LIBERROR_READ_VALUE:
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p = "Bad value during read";
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break;
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case LIBERROR_READ_OVERFLOW:
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p = "Numeric overflow on read";
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break;
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case LIBERROR_INTERNAL:
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p = "Internal error in run-time library";
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break;
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case LIBERROR_INTERNAL_UNIT:
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p = "Internal unit I/O error";
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break;
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case LIBERROR_DIRECT_EOR:
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p = "Write exceeds length of DIRECT access record";
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break;
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case LIBERROR_SHORT_RECORD:
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p = "I/O past end of record on unformatted file";
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break;
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case LIBERROR_CORRUPT_FILE:
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p = "Unformatted file structure has been corrupted";
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break;
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default:
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p = "Unknown error code";
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break;
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}
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return p;
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}
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/* generate_error()-- Come here when an error happens. This
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* subroutine is called if it is possible to continue on after the error.
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* If an IOSTAT or IOMSG variable exists, we set it. If IOSTAT or
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* ERR labels are present, we return, otherwise we terminate the program
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* after printing a message. The error code is always required but the
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* message parameter can be NULL, in which case a string describing
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* the most recent operating system error is used. */
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void
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generate_error (st_parameter_common *cmp, int family, const char *message)
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{
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char errmsg[STRERR_MAXSZ];
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/* If there was a previous error, don't mask it with another
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error message, EOF or EOR condition. */
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if ((cmp->flags & IOPARM_LIBRETURN_MASK) == IOPARM_LIBRETURN_ERROR)
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return;
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|
|
/* Set the error status. */
|
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if ((cmp->flags & IOPARM_HAS_IOSTAT))
|
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*cmp->iostat = (family == LIBERROR_OS) ? errno : family;
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|
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if (message == NULL)
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message =
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(family == LIBERROR_OS) ? gf_strerror (errno, errmsg, STRERR_MAXSZ) :
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translate_error (family);
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|
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if (cmp->flags & IOPARM_HAS_IOMSG)
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cf_strcpy (cmp->iomsg, cmp->iomsg_len, message);
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|
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/* Report status back to the compiler. */
|
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cmp->flags &= ~IOPARM_LIBRETURN_MASK;
|
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switch (family)
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{
|
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case LIBERROR_EOR:
|
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cmp->flags |= IOPARM_LIBRETURN_EOR;
|
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if ((cmp->flags & IOPARM_EOR))
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return;
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break;
|
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|
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case LIBERROR_END:
|
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cmp->flags |= IOPARM_LIBRETURN_END;
|
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if ((cmp->flags & IOPARM_END))
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return;
|
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break;
|
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|
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default:
|
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cmp->flags |= IOPARM_LIBRETURN_ERROR;
|
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if ((cmp->flags & IOPARM_ERR))
|
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return;
|
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break;
|
|
}
|
|
|
|
/* Return if the user supplied an iostat variable. */
|
|
if ((cmp->flags & IOPARM_HAS_IOSTAT))
|
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return;
|
|
|
|
/* Terminate the program */
|
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|
|
recursion_check ();
|
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show_locus (cmp);
|
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estr_write ("Fortran runtime error: ");
|
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estr_write (message);
|
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estr_write ("\n");
|
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exit (2);
|
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}
|
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iexport(generate_error);
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|
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|
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/* generate_warning()-- Similar to generate_error but just give a warning. */
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|
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void
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generate_warning (st_parameter_common *cmp, const char *message)
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|
{
|
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if (message == NULL)
|
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message = " ";
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|
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show_locus (cmp);
|
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estr_write ("Fortran runtime warning: ");
|
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estr_write (message);
|
|
estr_write ("\n");
|
|
}
|
|
|
|
|
|
/* Whether, for a feature included in a given standard set (GFC_STD_*),
|
|
we should issue an error or a warning, or be quiet. */
|
|
|
|
notification
|
|
notification_std (int std)
|
|
{
|
|
int warning;
|
|
|
|
if (!compile_options.pedantic)
|
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return NOTIFICATION_SILENT;
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|
|
warning = compile_options.warn_std & std;
|
|
if ((compile_options.allow_std & std) != 0 && !warning)
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return NOTIFICATION_SILENT;
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|
|
return warning ? NOTIFICATION_WARNING : NOTIFICATION_ERROR;
|
|
}
|
|
|
|
|
|
/* Possibly issue a warning/error about use of a nonstandard (or deleted)
|
|
feature. An error/warning will be issued if the currently selected
|
|
standard does not contain the requested bits. */
|
|
|
|
try
|
|
notify_std (st_parameter_common *cmp, int std, const char * message)
|
|
{
|
|
int warning;
|
|
|
|
if (!compile_options.pedantic)
|
|
return SUCCESS;
|
|
|
|
warning = compile_options.warn_std & std;
|
|
if ((compile_options.allow_std & std) != 0 && !warning)
|
|
return SUCCESS;
|
|
|
|
if (!warning)
|
|
{
|
|
recursion_check ();
|
|
show_locus (cmp);
|
|
estr_write ("Fortran runtime error: ");
|
|
estr_write (message);
|
|
estr_write ("\n");
|
|
exit (2);
|
|
}
|
|
else
|
|
{
|
|
show_locus (cmp);
|
|
estr_write ("Fortran runtime warning: ");
|
|
estr_write (message);
|
|
estr_write ("\n");
|
|
}
|
|
return FAILURE;
|
|
}
|