2 * Copyright (c) 2015 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
15 /*------------------------------------------------------------------
16 * format.c -- see notice below
18 * October 2003, Eliot Dresselhaus
20 * Modifications to this file Copyright (c) 2003 by cisco Systems, Inc.
21 * All rights reserved.
22 *------------------------------------------------------------------
26 Copyright (c) 2001, 2002, 2003, 2006 Eliot Dresselhaus
28 Permission is hereby granted, free of charge, to any person obtaining
29 a copy of this software and associated documentation files (the
30 "Software"), to deal in the Software without restriction, including
31 without limitation the rights to use, copy, modify, merge, publish,
32 distribute, sublicense, and/or sell copies of the Software, and to
33 permit persons to whom the Software is furnished to do so, subject to
34 the following conditions:
36 The above copyright notice and this permission notice shall be
37 included in all copies or substantial portions of the Software.
39 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
40 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
41 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
42 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
43 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
44 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
45 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
48 #include <stdarg.h> /* va_start, etc */
55 #ifdef CLIB_STANDALONE
56 #include <vppinfra/standalone_stdio.h>
59 #include <vppinfra/mem.h>
60 #include <vppinfra/format.h>
61 #include <vppinfra/vec.h>
62 #include <vppinfra/error.h>
63 #include <vppinfra/string.h>
64 #include <vppinfra/os.h> /* os_puts */
65 #include <vppinfra/math.h>
69 /* Output number in this base. */
72 /* Number of show of 64 bit number. */
75 /* Signed or unsigned. */
78 /* Output digits uppercase (not lowercase) %X versus %x. */
80 } format_integer_options_t;
82 static u8 *format_integer (u8 * s, u64 number,
83 format_integer_options_t * options);
84 static u8 *format_float (u8 * s, f64 x, uword n_digits_to_print,
89 /* String justification: + => right, - => left, = => center. */
92 /* Width of string (before and after decimal point for numbers).
93 0 => natural width. */
96 /* Long => 'l', long long 'L', int 0. */
99 /* Pad character. Defaults to space. */
104 justify (u8 * s, format_info_t * fi, uword s_len_orig)
109 l0 = i0 + fi->width[0];
112 /* If width is zero user returned width. */
121 uword n_left = 0, n_right = 0;
134 n_right = n_left = n / 2;
141 vec_insert (s, n_left, i0);
142 clib_memset (s + i0, fi->pad_char, n_left);
147 vec_resize (s, n_right);
148 clib_memset (s + l1, fi->pad_char, n_right);
155 do_percent (u8 ** _s, const u8 * fmt, va_list * va)
171 ASSERT (f[0] == '%');
189 /* Parse width0 . width1. */
191 uword is_first_digit = 1;
193 fi.width[0] = fi.width[1] = 0;
194 for (i = 0; i < 2; i++)
196 if (c == '0' && i == 0 && is_first_digit)
201 fi.width[i] = va_arg (*va, int);
206 while (c >= '0' && c <= '9')
208 fi.width[i] = 10 * fi.width[i] + (c - '0');
218 /* Parse %l* and %L* */
231 if (c == 'l' && *f == 'l')
239 /* Finally we are ready for format letter. */
242 uword s_initial_len = vec_len (s);
243 format_integer_options_t o = {
246 .n_bits = BITS (uword),
247 .uppercase_digits = 0,
256 /* Try to give a helpful error message. */
258 s = format (s, "**** CLIB unknown format `%%%c' ****", c);
263 vec_add1 (s, va_arg (*va, int));
271 o.n_bits = BITS (uword *);
273 o.uppercase_digits = 0;
275 s = format_integer (s, pointer_to_uword (va_arg (*va, void *)), &o);
286 if (c == 'x' || c == 'X')
288 o.is_signed = c == 'd';
289 o.uppercase_digits = c == 'X';
294 number = va_arg (*va, unsigned long long);
295 o.n_bits = BITS (unsigned long long);
299 number = va_arg (*va, long);
300 o.n_bits = BITS (long);
304 number = va_arg (*va, word);
305 o.n_bits = BITS (uword);
309 number = va_arg (*va, int);
310 o.n_bits = BITS (int);
314 s = format_integer (s, number, &o);
321 char *cstring = va_arg (*va, char *);
329 else if (fi.width[1] != 0)
330 len = clib_min (strlen (cstring), fi.width[1]);
332 len = strlen (cstring);
334 /* %S => format string as C identifier (replace _ with space). */
337 for (i = 0; i < len; i++)
338 vec_add1 (s, cstring[i] == '_' ? ' ' : cstring[i]);
341 vec_add (s, cstring, len);
347 u8 *v = va_arg (*va, u8 *);
350 if (fi.width[1] != 0)
351 len = clib_min (vec_len (v), fi.width[1]);
362 /* Floating point. */
363 ASSERT (fi.how_long == 0 || fi.how_long == 'l');
364 s = format_float (s, va_arg (*va, double), fi.width[1], c);
368 /* User defined function. */
370 typedef u8 *(user_func_t) (u8 * s, va_list * args);
371 user_func_t *u = va_arg (*va, user_func_t *);
378 s = justify (s, &fi, s_initial_len);
387 va_format (u8 * s, const char *fmt, va_list * va)
389 const u8 *f = (u8 *) fmt, *g;
403 vec_add (s, g, f - g);
404 f = g = do_percent (&s, f, va);
413 vec_add (s, g, f - g);
419 format (u8 * s, const char *fmt, ...)
423 s = va_format (s, fmt, &va);
427 return (u8 *) "liar liar pants on fire s can't be zero!";
433 va_fformat (FILE * f, char *fmt, va_list * va)
438 s = va_format (0, fmt, va);
443 ret = fwrite (s, vec_len (s), 1, f);
446 #endif /* CLIB_UNIX */
449 os_puts (s, vec_len (s), /* is_error */ 0);
457 fformat (FILE * f, char *fmt, ...)
463 ret = va_fformat (f, fmt, &va);
471 fformat_append_cr (FILE * ofp, const char *fmt, ...)
476 (void) va_fformat (ofp, (char *) fmt, &va);
482 fdformat (int fd, char *fmt, ...)
489 s = va_format (0, fmt, &va);
492 ret = write (fd, s, vec_len (s));
498 /* Format integral type. */
500 format_integer (u8 * s, u64 number, format_integer_options_t * options)
504 u8 digit_buffer[128];
505 u8 *d = digit_buffer + sizeof (digit_buffer);
508 if (options->is_signed && (i64) number < 0)
514 if (options->n_bits < BITS (number))
515 number &= ((u64) 1 << options->n_bits) - 1;
517 base = options->base;
524 if (r < 10 + 26 + 26)
528 else if (r < 10 + 26)
531 c = 'A' + (r - 10 - 26);
533 if (options->uppercase_digits
534 && base <= 10 + 26 && c >= 'a' && c <= 'z')
539 else /* will never happen, warning be gone */
550 vec_add (s, d, digit_buffer + sizeof (digit_buffer) - d);
554 /* Floating point formatting. */
555 /* Deconstruct IEEE 64 bit number into sign exponent and fraction. */
556 #define f64_down(f,sign,expon,fraction) \
558 union { u64 u; f64 f; } _f64_down_tmp; \
559 _f64_down_tmp.f = (f); \
560 (sign) = (_f64_down_tmp.u >> 63); \
561 (expon) = ((_f64_down_tmp.u >> 52) & 0x7ff) - 1023; \
562 (fraction) = ((_f64_down_tmp.u << 12) >> 12) | ((u64) 1 << 52); \
565 /* Construct IEEE 64 bit number. */
567 f64_up (uword sign, word expon, u64 fraction)
575 tmp.u = (u64) ((sign) != 0) << 63;
582 tmp.u |= (u64) expon << 52;
584 tmp.u |= fraction & (((u64) 1 << 52) - 1);
589 /* Returns approximate precision of number given its exponent. */
591 f64_precision (int base2_expon)
593 static int n_bits = 0;
597 /* Compute number of significant bits in floating point representation. */
609 return f64_up (0, base2_expon - n_bits, 0);
614 times_power_of_ten (f64 x, int n)
618 static f64 t[8] = { 1e+0, 1e+1, 1e+2, 1e+3, 1e+4, 1e+5, 1e+6, 1e+7, };
628 static f64 t[8] = { 1e-0, 1e-1, 1e-2, 1e-3, 1e-4, 1e-5, 1e-6, 1e-7, };
639 /* Write x = y * 10^expon with 1 < y < 10. */
641 normalize (f64 x, word * expon_return, f64 * prec_return)
643 word expon2, expon10;
644 CLIB_UNUSED (u64 fraction);
645 CLIB_UNUSED (word sign);
648 f64_down (x, sign, expon2, fraction);
652 expon2 * .301029995663981195213738894724493 /* Log (2) / Log (10) */ ;
654 prec = f64_precision (expon2);
655 x = times_power_of_ten (x, -expon10);
656 prec = times_power_of_ten (prec, -expon10);
678 *expon_return = expon10;
685 add_some_zeros (u8 * s, uword n_zeros)
695 /* Format a floating point number with the given number of fractional
696 digits (e.g. 1.2345 with 2 fraction digits yields "1.23") and output style. */
698 format_float (u8 * s, f64 x, uword n_fraction_digits, uword output_style)
701 word sign, expon, n_fraction_done, added_decimal_point;
702 /* Position of decimal point relative to where we are. */
705 /* Default number of digits to print when its not specified. */
706 if (n_fraction_digits == ~0)
707 n_fraction_digits = 7;
710 added_decimal_point = 0;
713 /* Special case: zero. */
727 /* Check for not-a-number. */
729 return format (s, "%cNaN", sign ? '-' : '+');
731 /* Check for infinity. */
733 return format (s, "%cinfinity", sign ? '-' : '+');
735 x = normalize (x, &expon, &prec);
737 /* Not enough digits to print anything: so just print 0 */
738 if ((word) - expon > (word) n_fraction_digits
739 && (output_style == 'f' || (output_style == 'g')))
745 if (output_style == 'f'
746 || (output_style == 'g' && expon > -10 && expon < 10))
750 /* Add decimal point and leading zeros. */
752 n_fraction_done = clib_min (-(expon + 1), n_fraction_digits);
753 s = add_some_zeros (s, n_fraction_done);
754 decimal_point = -n_fraction_done;
755 added_decimal_point = 1;
758 decimal_point = expon + 1;
762 /* Exponential output style. */
771 /* Number is smaller than precision: call it zero. */
783 /* Round last printed digit. */
784 if (decimal_point <= 0
785 && n_fraction_done + 1 == n_fraction_digits && digit < 9)
788 vec_add1 (s, '0' + digit);
790 /* Move rightwards towards/away from decimal point. */
793 n_fraction_done += decimal_point < 0;
794 if (decimal_point <= 0 && n_fraction_done >= n_fraction_digits)
797 if (decimal_point == 0 && x != 0)
800 added_decimal_point = 1;
808 if (decimal_point > 0)
810 s = add_some_zeros (s, decimal_point);
814 if (n_fraction_done < n_fraction_digits)
816 if (!added_decimal_point)
818 s = add_some_zeros (s, n_fraction_digits - n_fraction_done);
821 if (output_style == 'e')
822 s = format (s, "e%wd", expon);
829 * fd.io coding-style-patch-verification: ON
832 * eval: (c-set-style "gnu")