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//=========================================================================== // // vfnprintf.c // // I/O routines for vfnprintf() for use with ANSI C library // //=========================================================================== // ####ECOSGPLCOPYRIGHTBEGIN#### // ------------------------------------------- // This file is part of eCos, the Embedded Configurable Operating System. // Copyright (C) 1998, 1999, 2000, 2001, 2002, 2009 Free Software Foundation, Inc. // // eCos is free software; you can redistribute it and/or modify it under // the terms of the GNU General Public License as published by the Free // Software Foundation; either version 2 or (at your option) any later // version. // // eCos is distributed in the hope that it will be useful, but WITHOUT // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License // for more details. // // You should have received a copy of the GNU General Public License // along with eCos; if not, write to the Free Software Foundation, Inc., // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. // // As a special exception, if other files instantiate templates or use // macros or inline functions from this file, or you compile this file // and link it with other works to produce a work based on this file, // this file does not by itself cause the resulting work to be covered by // the GNU General Public License. However the source code for this file // must still be made available in accordance with section (3) of the GNU // General Public License v2. // // This exception does not invalidate any other reasons why a work based // on this file might be covered by the GNU General Public License. // ------------------------------------------- // ####ECOSGPLCOPYRIGHTEND#### //=========================================================================== //#####DESCRIPTIONBEGIN#### // // Author(s): jlarmour // Contributors: // Date: 2000-04-20 // Purpose: // Description: // Usage: // //####DESCRIPTIONEND#### // //=========================================================================== // // This code is based on original code with the following copyright: // /*- * Copyright (c) 1990 The Regents of the University of California. * All rights reserved. * * This code is derived from software contributed to Berkeley by * Chris Torek. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ // CONFIGURATION #include <pkgconf/libc_stdio.h> // Configuration header #include <pkgconf/libc_i18n.h> // Configuration header for mb support // INCLUDES #include <cyg/infra/cyg_type.h> // Common type definitions and support #include <stdarg.h> // Variable argument definitions #include <stdio.h> // Standard header for all stdio files #include <string.h> // memchr() and strlen() functions #include <cyg/libc/stdio/stream.hxx> // C library streams #ifdef CYGSEM_LIBC_STDIO_PRINTF_FLOATING_POINT # include <float.h> // for DBL_DIG etc. below # include <math.h> // for modf() # include <sys/ieeefp.h> // Cyg_libm_ieee_double_shape_type # define MAXFRACT DBL_DIG # define MAXEXP DBL_MAX_10_EXP # define BUF (MAXEXP+MAXFRACT+1) /* + decimal point */ # define DEFPREC 6 static int cvt( double, int, int, char *, int, char *, char * ); #else // ifdef CYGSEM_LIBC_STDIO_PRINTF_FLOATING_POINT # define BUF 40 #endif // ifdef CYGSEM_LIBC_STDIO_PRINTF_FLOATING_POINT /* * Actual printf innards. * * This code is large and complicated... */ #ifdef CYGINT_LIBC_I18N_MB_REQUIRED typedef int (*mbtowc_fn_type)(wchar_t *, const char *, size_t, int *); externC mbtowc_fn_type __get_current_locale_mbtowc_fn(); #endif /* * Macros for converting digits to letters and vice versa */ #define to_digit(c) ((c) - '0') #define is_digit(c) ((unsigned)to_digit(c) <= 9) #define to_char(n) ((n) + '0') /* * Flags used during conversion. */ #define ALT 0x001 /* alternate form */ #define HEXPREFIX 0x002 /* add 0x or 0X prefix */ #define LADJUST 0x004 /* left adjustment */ #define LONGDBL 0x008 /* long double; unimplemented */ #define LONGINT 0x010 /* long integer */ #define QUADINT 0x020 /* quad integer */ #define SHORTINT 0x040 /* short integer */ #define ZEROPAD 0x080 /* zero (as opposed to blank) pad */ #define FPT 0x100 /* Floating point number */ #define SIZET 0x200 /* size_t */ externC int vfnprintf ( FILE *stream, size_t n, const char *format, va_list arg) __THROW { char *fmt; /* format string */ int ch; /* character from fmt */ int x, y; /* handy integers (short term usage) */ char *cp; /* handy char pointer (short term usage) */ int flags; /* flags as above */ #ifdef CYGINT_LIBC_I18N_MB_REQUIRED int state = 0; /* state for mbtowc conversion */ mbtowc_fn_type mbtowc_fn; #endif int ret; /* return value accumulator */ int width; /* width from format (%8d), or 0 */ int prec; /* precision from format (%.3d), or -1 */ char sign; /* sign prefix (' ', '+', '-', or \0) */ wchar_t wc; #define quad_t long long #define u_quad_t unsigned long long u_quad_t _uquad; /* integer arguments %[diouxX] */ enum { OCT, DEC, HEX } base;/* base for [diouxX] conversion */ int dprec; /* a copy of prec if [diouxX], 0 otherwise */ int fieldsz; /* field size expanded by sign, etc */ int realsz; /* field size expanded by dprec */ int size; /* size of converted field or string */ char *xdigs; /* digits for [xX] conversion */ #define NIOV 8 char buf[BUF]; /* space for %c, %[diouxX], %[eEfgG] */ char ox[2]; /* space for 0x hex-prefix */ #ifdef CYGSEM_LIBC_STDIO_PRINTF_FLOATING_POINT char softsign; /* temporary negative sign for floats */ double _double; /* double precision arguments %[eEfgG] */ int fpprec; /* `extra' floating precision in [eEfgG] */ #endif /* * Choose PADSIZE to trade efficiency vs. size. If larger printf * fields occur frequently, increase PADSIZE and make the initialisers * below longer. */ #define PADSIZE 16 /* pad chunk size */ static char blanks[PADSIZE] = {' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '}; static char zeroes[PADSIZE] = {'0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0'}; #define MIN(a, b) ((a) < (b) ? (a) : (b)) /* * BEWARE, these `goto error' on error, and PAD uses `n'. */ #ifdef CYGIMP_LIBC_STDIO_C99_SNPRINTF #define PRINT(ptr, len) \ CYG_MACRO_START \ if ((size_t)(ret + 1) < n) { \ cyg_ucount32 length = MIN( (cyg_ucount32) len, n - ret - 1); \ if (((Cyg_OutputStream *)stream)->write( (const cyg_uint8 *)ptr, \ length, &length )) \ goto error; \ } \ CYG_MACRO_END #else #define PRINT(ptr, len) \ CYG_MACRO_START \ cyg_ucount32 length = MIN( (cyg_ucount32) len, n - ret - 1); \ if (((Cyg_OutputStream *)stream)->write( (const cyg_uint8 *)ptr, \ length, &length )) \ goto error; \ if (length < (cyg_ucount32)len) { \ ret += length; \ goto done; \ } \ CYG_MACRO_END #endif // CYGIMP_LIBC_STDIO_C99_SNPRINTF #define PAD(howmany, with) \ CYG_MACRO_START \ if ((x = (howmany)) > 0) { \ while (x > PADSIZE) { \ PRINT(with, PADSIZE); \ x -= PADSIZE; \ } \ PRINT(with, x); \ } \ CYG_MACRO_END /* * To extend shorts properly, we need both signed and unsigned * argument extraction methods. */ #define SARG() \ (flags&QUADINT ? va_arg(arg, cyg_int64) : \ flags&LONGINT ? va_arg(arg, long) : \ flags&SHORTINT ? (long)(short)va_arg(arg, int) : \ flags&SIZET ? (long)va_arg(arg, size_t) : \ (long)va_arg(arg, int)) #define UARG() \ (flags&QUADINT ? va_arg(arg, cyg_uint64) : \ flags&LONGINT ? va_arg(arg, unsigned long) : \ flags&SHORTINT ? (unsigned long)(unsigned short)va_arg(arg, int) : \ flags&SIZET ? va_arg(arg, size_t) : \ (unsigned long)va_arg(arg, unsigned int)) xdigs = NULL; // stop compiler whinging fmt = (char *)format; ret = 0; #ifdef CYGINT_LIBC_I18N_MB_REQUIRED mbtowc_fn = __get_current_locale_mbtowc_fn(); #endif /* * Scan the format for conversions (`%' character). */ for (;;) { cp = (char *)fmt; #ifndef CYGINT_LIBC_I18N_MB_REQUIRED while ((x = ((wc = *fmt) != 0))) { #else while ((x = mbtowc_fn (&wc, fmt, MB_CUR_MAX, &state)) > 0) { #endif fmt += x; if (wc == '%') { fmt--; break; } } if ((y = fmt - cp) != 0) { PRINT(cp, y); ret += y; } #ifdef CYGIMP_LIBC_STDIO_C99_SNPRINTF if (x <= 0) #else if ((x <= 0) || (ret >= (int)n)) // @@@ this check with n isn't good enough #endif goto done; fmt++; /* skip over '%' */ flags = 0; dprec = 0; #ifdef CYGSEM_LIBC_STDIO_PRINTF_FLOATING_POINT fpprec = 0; #endif width = 0; prec = -1; sign = '\0'; rflag: ch = *fmt++; reswitch: switch (ch) { case ' ': /* * ``If the space and + flags both appear, the space * flag will be ignored.'' * -- ANSI X3J11 */ if (!sign) sign = ' '; goto rflag; case '#': flags |= ALT; goto rflag; case '*': /* * ``A negative field width argument is taken as a * - flag followed by a positive field width.'' * -- ANSI X3J11 * They don't exclude field widths read from args. */ if ((width = va_arg(arg, int)) >= 0) goto rflag; width = -width; /* FALLTHROUGH */ case '-': flags |= LADJUST; goto rflag; case '+': sign = '+'; goto rflag; case '.': if ((ch = *fmt++) == '*') { x = va_arg(arg, int); prec = x < 0 ? -1 : x; goto rflag; } x = 0; while (is_digit(ch)) { x = 10 * x + to_digit(ch); ch = *fmt++; } prec = x < 0 ? -1 : x; goto reswitch; case '0': /* * ``Note that 0 is taken as a flag, not as the * beginning of a field width.'' * -- ANSI X3J11 */ flags |= ZEROPAD; goto rflag; case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9': x = 0; do { x = 10 * x + to_digit(ch); ch = *fmt++; } while (is_digit(ch)); width = x; goto reswitch; #ifdef CYGSEM_LIBC_STDIO_PRINTF_FLOATING_POINT case 'L': flags |= LONGDBL; goto rflag; #endif case 'h': flags |= SHORTINT; goto rflag; case 'l': if (*fmt == 'l') { fmt++; flags |= QUADINT; } else { flags |= LONGINT; } goto rflag; case 'q': flags |= QUADINT; goto rflag; case 'c': *(cp = buf) = va_arg(arg, int); size = 1; sign = '\0'; break; case 'D': flags |= LONGINT; /*FALLTHROUGH*/ case 'd': case 'i': _uquad = SARG(); #ifndef _NO_LONGLONG if ((quad_t)_uquad < 0) #else if ((long) _uquad < 0) #endif { _uquad = -_uquad; sign = '-'; } base = DEC; goto number; #ifdef CYGSEM_LIBC_STDIO_PRINTF_FLOATING_POINT case 'e': case 'E': case 'f': case 'g': case 'G': _double = va_arg(arg, double); /* * don't do unrealistic precision; just pad it with * zeroes later, so buffer size stays rational. */ if (prec > MAXFRACT) { if ((ch != 'g' && ch != 'G') || (flags&ALT)) fpprec = prec - MAXFRACT; prec = MAXFRACT; } else if (prec == -1) prec = DEFPREC; /* * cvt may have to round up before the "start" of * its buffer, i.e. ``intf("%.2f", (double)9.999);''; * if the first character is still NUL, it did. * softsign avoids negative 0 if _double < 0 but * no significant digits will be shown. */ cp = buf; *cp = '\0'; size = cvt(_double, prec, flags, &softsign, ch, cp, buf + sizeof(buf)); if (softsign) sign = '-'; if (*cp == '\0') cp++; break; #else case 'e': case 'E': case 'f': case 'g': case 'G': // Output nothing at all (void) va_arg(arg, double); // take off arg anyway cp = ""; size = 0; sign = '\0'; break; #endif // ifdef CYGSEM_LIBC_STDIO_PRINTF_FLOATING_POINT case 'n': #ifndef _NO_LONGLONG if (flags & QUADINT) *va_arg(arg, quad_t *) = ret; else #endif if (flags & LONGINT) *va_arg(arg, long *) = ret; else if (flags & SHORTINT) *va_arg(arg, short *) = ret; else if (flags & SIZET) *va_arg(arg, size_t *) = ret; else *va_arg(arg, int *) = ret; continue; /* no output */ case 'O': flags |= LONGINT; /*FALLTHROUGH*/ case 'o': _uquad = UARG(); base = OCT; goto nosign; case 'p': /* * ``The argument shall be a pointer to void. The * value of the pointer is converted to a sequence * of printable characters, in an implementation- * defined manner.'' * -- ANSI X3J11 */ /* NOSTRICT */ _uquad = (unsigned long)va_arg(arg, void *); base = HEX; xdigs = (char *)"0123456789abcdef"; flags |= HEXPREFIX; ch = 'x'; goto nosign; case 's': if ((cp = va_arg(arg, char *)) == NULL) cp = (char *)"(null)"; if (prec >= 0) { /* * can't use strlen; can only look for the * NUL in the first `prec' characters, and * strlen() will go further. */ char *p = (char *)memchr(cp, 0, prec); if (p != NULL) { size = p - cp; if (size > prec) size = prec; } else size = prec; } else size = strlen(cp); sign = '\0'; break; case 'U': flags |= LONGINT; /*FALLTHROUGH*/ case 'u': _uquad = UARG(); base = DEC; goto nosign; case 'X': xdigs = (char *)"0123456789ABCDEF"; goto hex; case 'x': xdigs = (char *)"0123456789abcdef"; hex: _uquad = UARG(); base = HEX; /* leading 0x/X only if non-zero */ if (flags & ALT && _uquad != 0) flags |= HEXPREFIX; /* unsigned conversions */ nosign: sign = '\0'; /* * ``... diouXx conversions ... if a precision is * specified, the 0 flag will be ignored.'' * -- ANSI X3J11 */ number: if ((dprec = prec) >= 0) flags &= ~ZEROPAD; /* * ``The result of converting a zero value with an * explicit precision of zero is no characters.'' * -- ANSI X3J11 */ cp = buf + BUF; if (_uquad != 0 || prec != 0) { /* * Unsigned mod is hard, and unsigned mod * by a constant is easier than that by * a variable; hence this switch. */ switch (base) { case OCT: do { *--cp = to_char(_uquad & 7); _uquad >>= 3; } while (_uquad); /* handle octal leading 0 */ if (flags & ALT && *cp != '0') *--cp = '0'; break; case DEC: if (!(flags & QUADINT)) { /* many numbers are 1 digit */ unsigned long v = (unsigned long)_uquad; while (v >= 10) { /* The following is usually faster than using a modulo */ unsigned long next = v / 10; *--cp = to_char(v - (next * 10)); v = next; } *--cp = to_char(v); } else { while (_uquad >= 10) { /* The following is usually faster than using a modulo */ u_quad_t next = _uquad / 10; *--cp = to_char(_uquad - (next * 10)); _uquad = next; } *--cp = to_char(_uquad); } break; case HEX: do { *--cp = xdigs[_uquad & 15]; _uquad >>= 4; } while (_uquad); break; default: cp = (char *)"bug in vfprintf: bad base"; size = strlen(cp); goto skipsize; } } size = buf + BUF - cp; skipsize: break; case 'z': flags |= SIZET; goto rflag; default: /* "%?" prints ?, unless ? is NUL */ if (ch == '\0') goto done; /* pretend it was %c with argument ch */ cp = buf; *cp = ch; size = 1; sign = '\0'; break; } /* * All reasonable formats wind up here. At this point, `cp' * points to a string which (if not flags&LADJUST) should be * padded out to `width' places. If flags&ZEROPAD, it should * first be prefixed by any sign or other prefix; otherwise, * it should be blank padded before the prefix is emitted. * After any left-hand padding and prefixing, emit zeroes * required by a decimal [diouxX] precision, then print the * string proper, then emit zeroes required by any leftover * floating precision; finally, if LADJUST, pad with blanks. * * Compute actual size, so we know how much to pad. * fieldsz excludes decimal prec; realsz includes it. */ #ifdef CYGSEM_LIBC_STDIO_PRINTF_FLOATING_POINT fieldsz = size + fpprec; #else fieldsz = size; #endif if (sign) fieldsz++; else if (flags & HEXPREFIX) fieldsz+= 2; realsz = dprec > fieldsz ? dprec : fieldsz; /* right-adjusting blank padding */ if ((flags & (LADJUST|ZEROPAD)) == 0) { if (width - realsz > 0) { PAD(width - realsz, blanks); ret += width - realsz; } } /* prefix */ if (sign) { PRINT(&sign, 1); ret++; } else if (flags & HEXPREFIX) { ox[0] = '0'; ox[1] = ch; PRINT(ox, 2); ret += 2; } /* right-adjusting zero padding */ if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD) { if (width - realsz > 0) { PAD(width - realsz, zeroes); ret += width - realsz; } } if (dprec - fieldsz > 0) { /* leading zeroes from decimal precision */ PAD(dprec - fieldsz, zeroes); ret += dprec - fieldsz; } /* the string or number proper */ PRINT(cp, size); ret += size; #ifdef CYGSEM_LIBC_STDIO_PRINTF_FLOATING_POINT /* trailing f.p. zeroes */ PAD(fpprec, zeroes); ret += fpprec; #endif /* left-adjusting padding (always blank) */ if (flags & LADJUST) { if (width - realsz > 0) { PAD(width - realsz, blanks); ret += width - realsz; } } } done: error: return (((Cyg_OutputStream *) stream)->get_error() ? EOF : ret); /* NOTREACHED */ } #ifdef CYGSEM_LIBC_STDIO_PRINTF_FLOATING_POINT static char * round(double fract, int *exp, char *start, char *end, char ch, char *signp) { double tmp; if (fract) (void)modf(fract * 10, &tmp); else tmp = to_digit(ch); if (tmp > 4) for (;; --end) { if (*end == '.') --end; if (++*end <= '9') break; *end = '0'; if (end == start) { if (exp) { /* e/E; increment exponent */ *end = '1'; ++*exp; } else { /* f; add extra digit */ *--end = '1'; --start; } break; } } /* ``"%.3f", (double)-0.0004'' gives you a negative 0. */ else if (*signp == '-') for (;; --end) { if (*end == '.') --end; if (*end != '0') break; if (end == start) *signp = 0; } return (start); } // round() static char * exponent(char *p, int exp, int fmtch) { char *t; char expbuf[MAXEXP]; *p++ = fmtch; if (exp < 0) { exp = -exp; *p++ = '-'; } else *p++ = '+'; t = expbuf + MAXEXP; if (exp > 9) { do { *--t = to_char(exp % 10); } while ((exp /= 10) > 9); *--t = to_char(exp); for (; t < expbuf + MAXEXP; *p++ = *t++); } else { *p++ = '0'; *p++ = to_char(exp); } return (p); } // exponent() static int cvt(double number, int prec, int flags, char *signp, int fmtch, char *startp, char *endp) { Cyg_libm_ieee_double_shape_type ieeefp; char *t = startp; ieeefp.value = number; *signp = 0; if ( ieeefp.number.sign ){ // this checks for <0.0 and -0.0 number = -number; *signp = '-'; } if (finite(number)) { char *p; double fract; int dotrim, expcnt, gformat; double integer, tmp; dotrim = expcnt = gformat = 0; fract = modf(number, &integer); /* get an extra slot for rounding. */ t = ++startp; /* * get integer portion of number; put into the end of the buffer; the * .01 is added for modf(356.0 / 10, &integer) returning .59999999... */ for (p = endp - 1; integer; ++expcnt) { tmp = modf(integer / 10, &integer); *p-- = to_char((int)((tmp + .01) * 10)); } switch (fmtch) { case 'f': /* reverse integer into beginning of buffer */ if (expcnt) for (; ++p < endp; *t++ = *p); else *t++ = '0'; /* * if precision required or alternate flag set, add in a * decimal point. */ if (prec || flags&ALT) *t++ = '.'; /* if requires more precision and some fraction left */ if (fract) { if (prec) do { fract = modf(fract * 10, &tmp); *t++ = to_char((int)tmp); } while (--prec && fract); if (fract) startp = round(fract, (int *)NULL, startp, t - 1, (char)0, signp); } for (; prec--; *t++ = '0'); break; case 'e': case 'E': eformat: if (expcnt) { *t++ = *++p; if (prec || flags&ALT) *t++ = '.'; /* if requires more precision and some integer left */ for (; prec && ++p < endp; --prec) *t++ = *p; /* * if done precision and more of the integer component, * round using it; adjust fract so we don't re-round * later. */ if (!prec && ++p < endp) { fract = 0; startp = round((double)0, &expcnt, startp, t - 1, *p, signp); } /* adjust expcnt for digit in front of decimal */ --expcnt; } /* until first fractional digit, decrement exponent */ else if (fract) { /* adjust expcnt for digit in front of decimal */ for (expcnt = -1;; --expcnt) { fract = modf(fract * 10, &tmp); if (tmp) break; } *t++ = to_char((int)tmp); if (prec || flags&ALT) *t++ = '.'; } else { *t++ = '0'; if (prec || flags&ALT) *t++ = '.'; } /* if requires more precision and some fraction left */ if (fract) { if (prec) do { fract = modf(fract * 10, &tmp); *t++ = to_char((int)tmp); } while (--prec && fract); if (fract) startp = round(fract, &expcnt, startp, t - 1, (char)0, signp); } /* if requires more precision */ for (; prec--; *t++ = '0'); /* unless alternate flag, trim any g/G format trailing 0's */ if (gformat && !(flags&ALT)) { while (t > startp && *--t == '0'); if (*t == '.') --t; ++t; } t = exponent(t, expcnt, fmtch); break; case 'g': case 'G': /* a precision of 0 is treated as a precision of 1. */ if (!prec) ++prec; /* * ``The style used depends on the value converted; style e * will be used only if the exponent resulting from the * conversion is less than -4 or greater than the precision.'' * -- ANSI X3J11 */ if (expcnt > prec || (!expcnt && fract && fract < .0001)) { /* * g/G format counts "significant digits, not digits of * precision; for the e/E format, this just causes an * off-by-one problem, i.e. g/G considers the digit * before the decimal point significant and e/E doesn't * count it as precision. */ --prec; fmtch -= 2; /* G->E, g->e */ gformat = 1; goto eformat; } /* * reverse integer into beginning of buffer, * note, decrement precision */ if (expcnt) for (; ++p < endp; *t++ = *p, --prec); else *t++ = '0'; /* * if precision required or alternate flag set, add in a * decimal point. If no digits yet, add in leading 0. */ if (prec || flags&ALT) { dotrim = 1; *t++ = '.'; } else dotrim = 0; /* if requires more precision and some fraction left */ if (fract) { if (prec) { do { fract = modf(fract * 10, &tmp); *t++ = to_char((int)tmp); } while(!tmp); while (--prec && fract) { fract = modf(fract * 10, &tmp); *t++ = to_char((int)tmp); } } if (fract) startp = round(fract, (int *)NULL, startp, t - 1, (char)0, signp); } /* alternate format, adds 0's for precision, else trim 0's */ if (flags&ALT) for (; prec--; *t++ = '0'); else if (dotrim) { while (t > startp && *--t == '0'); if (*t != '.') ++t; } } } else { unsigned case_adj; switch (fmtch) { case 'f': case 'g': case 'e': case_adj = 'a' - 'A'; break; default: case_adj = 0; } if (isnan(number)) { *t++ = 'N' + case_adj; *t++ = 'A' + case_adj; *t++ = 'N' + case_adj; } else { // infinite *t++ = 'I' + case_adj; *t++ = 'N' + case_adj; *t++ = 'F' + case_adj; } } return (t - startp); } // cvt() #endif // ifdef CYGSEM_LIBC_STDIO_PRINTF_FLOATING_POINT // EOF vfnprintf.cxx