539 lines
9.8 KiB
C
539 lines
9.8 KiB
C
/* Copyright (C) 2002-2003 Free Software Foundation, Inc.
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Contributed by Andy Vaught
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This file is part of the GNU Fortran 95 runtime library (libgfor).
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Libgfor 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 2, or (at your option)
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any later version.
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Libgfor 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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You should have received a copy of the GNU General Public License
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along with libgfor; see the file COPYING. If not, write to
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the Free Software Foundation, 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "config.h"
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#include <stdio.h>
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#include <stdarg.h>
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#include <string.h>
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#include <float.h>
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#include "libgfortran.h"
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#include "../io/io.h"
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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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* 4 Error during error processing (very bad)
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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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/* locus variables. These are optionally set by a caller before a
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* library subroutine is called. They are always cleared on exit so
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* that files that report loci and those that do not can be linked
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* together without reporting an erroneous position. */
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char *filename;
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unsigned line;
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static char buffer[32]; /* buffer for integer/ascii conversions */
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/* rtoa()-- Real to ascii conversion for base 10 and below.
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* Returns a pointer to a static buffer. */
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char *
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rtoa (double f, int length, int oprec)
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{
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double n = f;
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double fval, minval;
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int negative, prec;
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unsigned k;
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char formats[16];
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prec = 0;
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negative = 0;
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if (n < 0.0)
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{
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negative = 1;
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n = -n;
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}
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if (length >= 8)
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minval = FLT_MIN;
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else
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minval = DBL_MIN;
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if (n <= minval)
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{
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buffer[0] = '0';
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buffer[1] = '.';
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for (k = 2; k < 28 ; k++)
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buffer[k] = '0';
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buffer[k+1] = '\0';
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return buffer;
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}
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fval = n;
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while (fval > 1.0)
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{
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fval = fval / 10.0;
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prec ++;
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}
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prec = sizeof (buffer) - 2 - prec;
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if (prec > 20)
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prec = 20;
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prec = prec > oprec ? oprec : prec ;
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if (negative)
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sprintf (formats, "-%%.%df", prec);
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else
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sprintf (formats, "%%.%df", prec);
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sprintf (buffer, formats, n);
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return buffer;
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}
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/* Returns a pointer to a static buffer. */
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char *
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itoa (int64_t n)
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{
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int negative;
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char *p;
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if (n == 0)
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{
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buffer[0] = '0';
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buffer[1] = '\0';
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return buffer;
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}
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negative = 0;
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if (n < 0)
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{
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negative = 1;
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n = -n;
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}
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p = buffer + sizeof (buffer) - 1;
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*p-- = '\0';
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while (n != 0)
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{
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*p-- = '0' + (n % 10);
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n /= 10;
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}
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if (negative)
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*p-- = '-';
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return ++p;
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}
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/* xtoa()-- Integer to hexadecimal conversion. Returns a pointer to a
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* static buffer. */
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char *
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xtoa (uint64_t n)
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{
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int digit;
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char *p;
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if (n == 0)
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{
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buffer[0] = '0';
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buffer[1] = '\0';
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return buffer;
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}
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p = buffer + sizeof (buffer) - 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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/* st_printf()-- simple printf() function for streams that handles the
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* formats %d, %s and %c. This function handles printing of error
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* messages that originate within the library itself, not from a user
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* program. */
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int
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st_printf (const char *format, ...)
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{
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int count, total;
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va_list arg;
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char *p, *q;
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stream *s;
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total = 0;
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s = init_error_stream ();
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va_start (arg, format);
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for (;;)
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{
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count = 0;
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while (format[count] != '%' && format[count] != '\0')
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count++;
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if (count != 0)
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{
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p = salloc_w (s, &count);
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memmove (p, format, count);
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sfree (s);
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}
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total += count;
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format += count;
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if (*format++ == '\0')
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break;
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switch (*format)
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{
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case 'c':
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count = 1;
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p = salloc_w (s, &count);
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*p = (char) va_arg (arg, int);
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sfree (s);
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break;
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case 'd':
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q = itoa (va_arg (arg, int));
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count = strlen (q);
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p = salloc_w (s, &count);
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memmove (p, q, count);
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sfree (s);
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break;
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case 'x':
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q = xtoa (va_arg (arg, unsigned));
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count = strlen (q);
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p = salloc_w (s, &count);
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memmove (p, q, count);
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sfree (s);
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break;
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case 's':
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q = va_arg (arg, char *);
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count = strlen (q);
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p = salloc_w (s, &count);
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memmove (p, q, count);
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sfree (s);
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break;
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case '\0':
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return total;
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default:
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count = 2;
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p = salloc_w (s, &count);
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p[0] = format[-1];
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p[1] = format[0];
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sfree (s);
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break;
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}
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total += count;
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format++;
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}
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va_end (arg);
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return total;
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}
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/* st_sprintf()-- Simple sprintf() for formatting memory buffers. */
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void
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st_sprintf (char *buffer, const char *format, ...)
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{
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va_list arg;
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char c, *p;
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int count;
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va_start (arg, format);
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for (;;)
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{
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c = *format++;
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if (c != '%')
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{
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*buffer++ = c;
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if (c == '\0')
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break;
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continue;
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}
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c = *format++;
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switch (c)
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{
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case 'c':
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*buffer++ = (char) va_arg (arg, int);
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break;
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case 'd':
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p = itoa (va_arg (arg, int));
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count = strlen (p);
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memcpy (buffer, p, count);
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buffer += count;
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break;
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case 's':
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p = va_arg (arg, char *);
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count = strlen (p);
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memcpy (buffer, p, count);
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buffer += count;
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break;
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default:
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*buffer++ = c;
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}
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}
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va_end (arg);
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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 (void)
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{
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if (!options.locus || filename == NULL)
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return;
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st_printf ("At line %d of file %s\n", line, 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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if (magic == MAGIC)
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sys_exit (4); /* Don't even try to print something at this point */
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magic = MAGIC;
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}
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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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recursion_check ();
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show_locus ();
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st_printf ("Operating system error: %s\n%s\n", get_oserror (), message);
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sys_exit (1);
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}
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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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recursion_check ();
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show_locus ();
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st_printf ("Fortran runtime error: %s\n", message);
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sys_exit (2);
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}
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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 (const char *message)
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{
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recursion_check ();
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show_locus ();
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st_printf ("Internal Error: %s\n", message);
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sys_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 ERROR_EOR:
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p = "End of record";
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break;
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case ERROR_END:
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p = "End of file";
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break;
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case ERROR_OK:
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p = "Successful return";
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break;
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case ERROR_OS:
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p = "Operating system error";
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break;
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case ERROR_BAD_OPTION:
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p = "Bad statement option";
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break;
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case ERROR_MISSING_OPTION:
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p = "Missing statement option";
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break;
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case ERROR_OPTION_CONFLICT:
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p = "Conflicting statement options";
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break;
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case ERROR_ALREADY_OPEN:
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p = "File already opened in another unit";
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break;
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case ERROR_BAD_UNIT:
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p = "Unattached unit";
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break;
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case ERROR_FORMAT:
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p = "FORMAT error";
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break;
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case ERROR_BAD_ACTION:
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p = "Incorrect ACTION specified";
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break;
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case ERROR_ENDFILE:
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p = "Read past ENDFILE record";
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break;
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case ERROR_BAD_US:
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p = "Corrupt unformatted sequential file";
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break;
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case ERROR_READ_VALUE:
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p = "Bad value during read";
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break;
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case ERROR_READ_OVERFLOW:
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p = "Numeric overflow on read";
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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
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* error. If an IOSTAT variable exists, we set it. If the IOSTAT or
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* ERR label is present, we return, otherwise we terminate the program
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* after print 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 (int family, const char *message)
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{
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if (ioparm.iostat != NULL)
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{
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*ioparm.iostat = family;
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return;
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}
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switch (family)
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{
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case ERROR_EOR:
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ioparm.library_return = LIBRARY_EOR;
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if (ioparm.eor != 0)
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return;
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break;
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case ERROR_END:
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ioparm.library_return = LIBRARY_END;
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if (ioparm.end != 0)
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return;
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break;
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default:
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ioparm.library_return = LIBRARY_ERROR;
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break;
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}
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if (ioparm.err != 0)
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return;
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/* Terminate the program */
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if (message == NULL)
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message =
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(family == ERROR_OS) ? get_oserror () : translate_error (family);
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runtime_error (message);
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}
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