ae2cbf4c64
loop pointed out by cognet@ that occurs when calling strtod() with a string representing a number between DBL_MAX and 2*DBL_MAX, when the rounding mode is anything other than the default.
70 lines
2.1 KiB
C
70 lines
2.1 KiB
C
/****************************************************************
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The author of this software is David M. Gay.
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Copyright (C) 1998 by Lucent Technologies
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and
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its documentation for any purpose and without fee is hereby
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granted, provided that the above copyright notice appear in all
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copies and that both that the copyright notice and this
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permission notice and warranty disclaimer appear in supporting
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documentation, and that the name of Lucent or any of its entities
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not be used in advertising or publicity pertaining to
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distribution of the software without specific, written prior
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permission.
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LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
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IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY
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SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
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IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
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ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
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THIS SOFTWARE.
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****************************************************************/
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/* Please send bug reports to David M. Gay (dmg at acm dot org,
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* with " at " changed at "@" and " dot " changed to "."). */
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#include <stdio.h>
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#include <stdlib.h>
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static char *dir[4] = { "toward zero", "nearest", "toward +Infinity",
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"toward -Infinity" };
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int
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#ifdef KR_headers
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getround(r, s) int r; char *s;
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#else
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getround(int r, char *s)
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#endif
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{
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int i;
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while(*++s <= ' ') {
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if (!*s) {
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printf("Current round mode for strtor... is %d (%s).\n",
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r, dir[r]);
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return r;
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}
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}
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i = atoi(s);
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if (i >= 0 && i < 4) {
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printf("Rounding mode for strtor... ");
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if (i == r)
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printf("was and is %d (%s)\n", i, dir[i]);
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else
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printf("changed from %d (%s) to %d (%s)\n",
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r, dir[r], i, dir[i]);
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return i;
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}
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printf("Bad rounding direction %d: choose among\n", i);
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for(i = 0; i < 4; i++)
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printf("\t%d (%s)\n", i, dir[i]);
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printf("Leaving rounding mode for strtor... at %d (%s)\n", r, dir[r]);
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return r;
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}
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