mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 11:37:35 +00:00
f882887178
Before this commit, cosmopolitan had some issues with handling arguments of 0 and signs, such as returning an incorrect sign when the input value == -0.0, and incorrectly handling ndigit == 0 on fcvt (ndigit determines the amount of digits *after* the radix character on fcvt, thus the parts before it still must be outputted before fcvt's job is completely done). This patch fixes these issues, and adds tests with corresponding inputs.
129 lines
4.3 KiB
C
129 lines
4.3 KiB
C
/*-*- mode:c;indent-tabs-mode:t;c-basic-offset:8;tab-width:8;coding:utf-8 -*-│
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│ vi: set noet ft=c ts=8 sw=8 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ $OpenBSD: ecvt.c,v 1.11 2019/01/25 00:19:25 millert Exp $ │
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│ │
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│ Copyright (c) 2002, 2006 Todd C. Miller <millert@openbsd.org> │
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│ │
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│ Permission to use, copy, modify, and distribute this software for any │
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│ purpose with or without fee is hereby granted, provided that the above │
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│ copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES │
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│ WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF │
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│ MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR │
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│ ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES │
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│ WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN │
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│ ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF │
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│ OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. │
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│ │
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│ Sponsored in part by the Defense Advanced Research Projects │
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│ Agency (DARPA) and Air Force Research Laboratory, Air Force │
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│ Materiel Command, USAF, under agreement number F39502-99-1-0512. │
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│ SUCH DAMAGE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/math.h"
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#include "libc/mem/mem.h"
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#include "libc/runtime/runtime.h"
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#include "libc/str/str.h"
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#include "third_party/gdtoa/gdtoa.h"
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__notice(ecvt_notice, "\
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OpenBSD ecvt (MIT)\n\
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Copyright (c) 2002, 2006, 2010 Todd C. Miller <millert@openbsd.org>");
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// clang-format off
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static char *s;
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static void
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__cvt_atexit(void)
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{
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free(s);
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s = 0;
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}
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static __attribute__((__constructor__(60))) textstartup void
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__cvt_init(void)
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{
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atexit(__cvt_atexit);
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}
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static char *
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__cvt(double value, int ndigit, int *decpt, int *sign, int fmode, int pad)
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{
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char *p, *rve, c;
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size_t siz;
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// Note that we exclude the case of fmode here, since for fcvt having
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// `ndigit == 0` just means we have to output 0 digits *after* the radix
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// character
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if (ndigit == 0 && !fmode) {
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*sign = signbit(value);
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*decpt = 0;
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return ("");
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}
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free(s);
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s = NULL;
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if (ndigit < 0)
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siz = -ndigit + 1;
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else
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siz = ndigit + 1;
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/* __dtoa() doesn't allocate space for 0 so we do it by hand */
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if (value == 0.0) {
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*decpt = 1 - fmode; /* 1 for 'e', 0 for 'f' */
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*sign = signbit(value);
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if ((rve = s = malloc(siz)) == NULL)
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return(NULL);
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// handle fcvt(0, 0, ...) by returning ""
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if (siz > 1)
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*rve++ = '0';
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*rve = '\0';
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} else {
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p = dtoa(value, fmode + 2, ndigit, decpt, sign, &rve);
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if (p == NULL)
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return (NULL);
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if (*decpt == 9999) {
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/* Infinity or Nan, convert to inf or nan like printf */
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*decpt = 0;
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c = *p;
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freedtoa(p);
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return(c == 'I' ? "inf" : "nan");
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}
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/* Make a local copy and adjust rve to be in terms of s */
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if (pad && fmode)
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siz += *decpt;
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if ((s = malloc(siz)) == NULL) {
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freedtoa(p);
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return(NULL);
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}
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(void) strlcpy(s, p, siz);
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rve = s + (rve - p);
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freedtoa(p);
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}
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/* Add trailing zeros */
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if (pad) {
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siz -= rve - s;
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while (--siz)
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*rve++ = '0';
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*rve = '\0';
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}
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return(s);
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}
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char *
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ecvt(double value, int ndigit, int *decpt, int *sign)
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{
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return(__cvt(value, ndigit, decpt, sign, 0, 1));
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}
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char *
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fcvt(double value, int ndigit, int *decpt, int *sign)
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{
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return(__cvt(value, ndigit, decpt, sign, 1, 1));
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}
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