1112158Sdas/**************************************************************** 2112158Sdas 3112158SdasThe author of this software is David M. Gay. 4112158Sdas 5112158SdasCopyright (C) 1998 by Lucent Technologies 6112158SdasAll Rights Reserved 7112158Sdas 8112158SdasPermission to use, copy, modify, and distribute this software and 9112158Sdasits documentation for any purpose and without fee is hereby 10112158Sdasgranted, provided that the above copyright notice appear in all 11112158Sdascopies and that both that the copyright notice and this 12112158Sdaspermission notice and warranty disclaimer appear in supporting 13112158Sdasdocumentation, and that the name of Lucent or any of its entities 14112158Sdasnot be used in advertising or publicity pertaining to 15112158Sdasdistribution of the software without specific, written prior 16112158Sdaspermission. 17112158Sdas 18112158SdasLUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, 19112158SdasINCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. 20112158SdasIN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY 21112158SdasSPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 22112158SdasWHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER 23112158SdasIN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, 24112158SdasARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF 25112158SdasTHIS SOFTWARE. 26112158Sdas 27112158Sdas****************************************************************/ 28112158Sdas 29165743Sdas/* Please send bug reports to David M. Gay (dmg at acm dot org, 30165743Sdas * with " at " changed at "@" and " dot " changed to "."). */ 31112158Sdas 32112158Sdas#include "gdtoaimp.h" 33112158Sdas 34112158Sdas char* 35112158Sdas#ifdef KR_headers 36187808Sdasg_ffmt(buf, f, ndig, bufsize) char *buf; float *f; int ndig; size_t bufsize; 37112158Sdas#else 38187808Sdasg_ffmt(char *buf, float *f, int ndig, size_t bufsize) 39112158Sdas#endif 40112158Sdas{ 41187808Sdas static FPI fpi0 = { 24, 1-127-24+1, 254-127-24+1, 1, 0 }; 42112158Sdas char *b, *s, *se; 43112158Sdas ULong bits[1], *L, sign; 44112158Sdas int decpt, ex, i, mode; 45187808Sdas#ifdef Honor_FLT_ROUNDS 46187808Sdas#include "gdtoa_fltrnds.h" 47187808Sdas#else 48187808Sdas#define fpi &fpi0 49187808Sdas#endif 50112158Sdas 51112158Sdas if (ndig < 0) 52112158Sdas ndig = 0; 53112158Sdas if (bufsize < ndig + 10) 54112158Sdas return 0; 55112158Sdas 56112158Sdas L = (ULong*)f; 57112158Sdas sign = L[0] & 0x80000000L; 58112158Sdas if ((L[0] & 0x7f800000) == 0x7f800000) { 59112158Sdas /* Infinity or NaN */ 60112158Sdas if (L[0] & 0x7fffff) { 61112158Sdas return strcp(buf, "NaN"); 62112158Sdas } 63112158Sdas b = buf; 64112158Sdas if (sign) 65112158Sdas *b++ = '-'; 66112158Sdas return strcp(b, "Infinity"); 67112158Sdas } 68112158Sdas if (*f == 0.) { 69112158Sdas b = buf; 70112158Sdas#ifndef IGNORE_ZERO_SIGN 71112158Sdas if (L[0] & 0x80000000L) 72112158Sdas *b++ = '-'; 73112158Sdas#endif 74112158Sdas *b++ = '0'; 75112158Sdas *b = 0; 76112158Sdas return b; 77112158Sdas } 78112158Sdas bits[0] = L[0] & 0x7fffff; 79112158Sdas if ( (ex = (L[0] >> 23) & 0xff) !=0) 80112158Sdas bits[0] |= 0x800000; 81112158Sdas else 82112158Sdas ex = 1; 83112158Sdas ex -= 0x7f + 23; 84112158Sdas mode = 2; 85112158Sdas if (ndig <= 0) { 86112158Sdas if (bufsize < 16) 87112158Sdas return 0; 88112158Sdas mode = 0; 89112158Sdas } 90112158Sdas i = STRTOG_Normal; 91187808Sdas s = gdtoa(fpi, ex, bits, &i, mode, ndig, &decpt, &se); 92187808Sdas return g__fmt(buf, s, se, decpt, sign, bufsize); 93112158Sdas } 94