| /* |
| Copyright (C) 1993 Free Software Foundation |
| |
| This file is part of the GNU IO Library. This library 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. |
| |
| This library 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 this library; see the file COPYING. If not, write to the Free |
| Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| |
| As a special exception, if you link this library with files |
| compiled with a GNU compiler to produce an executable, this does not cause |
| the resulting executable to be covered by the GNU General Public License. |
| This exception does not however invalidate any other reasons why |
| the executable file might be covered by the GNU General Public License. */ |
| |
| #include "libioP.h" |
| |
| #ifdef _IO_USE_DTOA |
| /* Format floating-point number and print them. |
| Return number of chars printed, or EOF on error. |
| |
| sign_mode == '+' : print "-" or "+" |
| sign_mode == ' ' : print "-" or " " |
| sign_mode == '\0' : print "-' or "" |
| */ |
| |
| int |
| _IO_outfloat (value, sb, type, width, precision, flags, sign_mode, fill) |
| double value; |
| _IO_FILE *sb; |
| int type; |
| int width; |
| int precision; |
| int flags; |
| int sign_mode; |
| int fill; |
| { |
| int count = 0; |
| #define PUT(x) do {if (_IO_putc(x, sb) < 0) goto error; count++;} while (0) |
| #define PUTN(p, n) \ |
| do {int _n=n; count+=_n; if (_IO_sputn(sb, p,_n) != _n) goto error;} while(0) |
| #define PADN(fill, n) \ |
| do {int _n = n; count+=_n; if (_IO_padn(sb, fill, _n) != _n) goto error;} while (0) |
| int pad_kind = flags & (_IO_LEFT|_IO_RIGHT|_IO_INTERNAL); |
| int skip_zeroes = 0; |
| int show_dot = (flags & _IO_SHOWPOINT) != 0; |
| int decpt; |
| int sign; |
| int mode; |
| int exponent_size; |
| int print_sign; |
| int trailing_zeroes, useful_digits; |
| int padding, unpadded_width; |
| char *p; |
| char *exponent_start; |
| register int i; |
| #define EBUF_SIZE 12 |
| #define EBUF_END &ebuf[EBUF_SIZE] |
| char ebuf[EBUF_SIZE]; |
| char *end; |
| int exp = 0; |
| switch (type) |
| { |
| case 'f': |
| mode = 3; |
| break; |
| case 'e': |
| case 'E': |
| exp = type; |
| mode = 2; |
| if (precision != 999) |
| precision++; /* Add one to include digit before decimal point. */ |
| break; |
| case 'g': |
| case 'G': |
| exp = type == 'g' ? 'e' : 'E'; |
| if (precision == 0) precision = 1; |
| if (!(flags & _IO_SHOWPOINT)) |
| skip_zeroes = 1; |
| type = 'g'; |
| mode = 2; |
| break; |
| } |
| /* Do the actual convension */ |
| if (precision == 999 && mode != 3) |
| mode = 0; |
| p = _IO_dtoa(value, mode, precision, &decpt, &sign, &end); |
| useful_digits = end-p; |
| exponent_start = EBUF_END; |
| if (mode == 0) |
| precision = useful_digits; |
| /* Check if we need to emit an exponent. */ |
| if (mode != 3 && decpt != 9999) |
| { |
| i = decpt - 1; |
| if ((type != 'g' && type != 'F') || i < -4 || i >= precision) |
| { |
| /* Print the exponent into ebuf. |
| We write ebuf in reverse order (right-to-left). */ |
| char sign; |
| if (i >= 0) |
| sign = '+'; |
| else |
| sign = '-', i = -i; |
| /* Note: ANSI requires at least 2 exponent digits. */ |
| do { |
| *--exponent_start = (i % 10) + '0'; |
| i /= 10; |
| } while (i >= 10); |
| *--exponent_start = i + '0'; |
| *--exponent_start = sign; |
| *--exponent_start = exp; |
| } |
| } |
| exponent_size = EBUF_END - exponent_start; |
| if (mode == 1) |
| precision = 1; |
| /* If we print an exponent, always show just one digit before point. */ |
| if (exponent_size) |
| decpt = 1; |
| if (decpt == 9999) |
| { /* Infinity or NaN */ |
| decpt = useful_digits; |
| precision = 0; |
| show_dot = 0; |
| } |
| |
| /* dtoa truncates trailing zeroes. Set the variable trailing_zeroes to |
| the number of 0's we have to add (after the decimal point). */ |
| if (skip_zeroes) |
| trailing_zeroes = 0; |
| else if (type == 'f') |
| trailing_zeroes = useful_digits <= decpt ? precision |
| : precision-(useful_digits-decpt); |
| else if (exponent_size) /* 'e' 'E' or 'g' format using exponential notation*/ |
| trailing_zeroes = precision - useful_digits; |
| else /* 'g' format not using exponential notation. */ |
| trailing_zeroes = useful_digits <= decpt ? precision - decpt |
| : precision-useful_digits; |
| if (trailing_zeroes < 0) trailing_zeroes = 0; |
| |
| if (trailing_zeroes != 0 || useful_digits > decpt) |
| show_dot = 1; |
| if (sign_mode == 0) |
| print_sign = sign ? '-' : 0; |
| else if (sign_mode == '+') |
| print_sign = sign ? '-' : '+'; |
| else /* if (sign_mode == ' ') */ |
| print_sign = sign ? '-' : ' '; |
| |
| /* Calculate the width (before padding). */ |
| unpadded_width = |
| (print_sign != 0) + trailing_zeroes + exponent_size + show_dot |
| + useful_digits |
| + (decpt > useful_digits ? decpt - useful_digits |
| : decpt > 0 ? 0 : 1 - decpt); |
| |
| padding = width > unpadded_width ? width - unpadded_width : 0; |
| if (padding > 0 && pad_kind != _IO_LEFT && pad_kind != _IO_INTERNAL) |
| PADN(fill, padding); /* Default (right) adjust */ |
| if (print_sign) |
| PUT(print_sign); |
| if (pad_kind == _IO_INTERNAL && padding > 0) |
| PADN(fill, padding); |
| if (decpt > 0) |
| { |
| if (useful_digits >= decpt) |
| PUTN(p, decpt); |
| else |
| { |
| PUTN(p, useful_digits); |
| PADN('0', decpt-useful_digits); |
| } |
| if (show_dot) |
| { |
| PUT('.'); |
| /* Print digits after the decimal point. */ |
| if (useful_digits > decpt) |
| PUTN(p + decpt, useful_digits-decpt); |
| } |
| } |
| else |
| { |
| PUT('0'); |
| if (show_dot) |
| { |
| PUT('.'); |
| PADN('0', -decpt); |
| /* Print digits after the decimal point. */ |
| PUTN(p, useful_digits); |
| } |
| } |
| PADN('0', trailing_zeroes); |
| if (exponent_size) |
| PUTN(exponent_start, exponent_size); |
| if (pad_kind == _IO_LEFT && padding > 0) /* Left adjustment*/ |
| PADN(fill, padding); |
| return count; |
| error: |
| return EOF; |
| } |
| #endif |