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fmt_scaled.c

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1/* $OpenBSD: fmt_scaled.c,v 1.17 2018/05/14 04:39:04 djm Exp $ */-
2-
3/*-
4 * Copyright (c) 2001, 2002, 2003 Ian F. Darwin. All rights reserved.-
5 *-
6 * Redistribution and use in source and binary forms, with or without-
7 * modification, are permitted provided that the following conditions-
8 * are met:-
9 * 1. Redistributions of source code must retain the above copyright-
10 * notice, this list of conditions and the following disclaimer.-
11 * 2. Redistributions in binary form must reproduce the above copyright-
12 * notice, this list of conditions and the following disclaimer in the-
13 * documentation and/or other materials provided with the distribution.-
14 * 3. The name of the author may not be used to endorse or promote products-
15 * derived from this software without specific prior written permission.-
16 *-
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR-
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES-
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.-
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,-
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT-
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,-
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY-
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT-
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF-
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.-
27 */-
28-
29/* OPENBSD ORIGINAL: lib/libutil/fmt_scaled.c */-
30-
31/*-
32 * fmt_scaled: Format numbers scaled for human comprehension-
33 * scan_scaled: Scan numbers in this format.-
34 *-
35 * "Human-readable" output uses 4 digits max, and puts a unit suffix at-
36 * the end. Makes output compact and easy-to-read esp. on huge disks.-
37 * Formatting code was originally in OpenBSD "df", converted to library routine.-
38 * Scanning code written for OpenBSD libutil.-
39 */-
40-
41#include "includes.h"-
42-
43#ifndef HAVE_FMT_SCALED-
44-
45#include <stdio.h>-
46#include <stdlib.h>-
47#include <errno.h>-
48#include <string.h>-
49#include <ctype.h>-
50#include <limits.h>-
51-
52typedef enum {-
53 NONE = 0, KILO = 1, MEGA = 2, GIGA = 3, TERA = 4, PETA = 5, EXA = 6-
54} unit_type;-
55-
56/* These three arrays MUST be in sync! XXX make a struct */-
57static unit_type units[] = { NONE, KILO, MEGA, GIGA, TERA, PETA, EXA };-
58static char scale_chars[] = "BKMGTPE";-
59static long long scale_factors[] = {-
60 1LL,-
61 1024LL,-
62 1024LL*1024,-
63 1024LL*1024*1024,-
64 1024LL*1024*1024*1024,-
65 1024LL*1024*1024*1024*1024,-
66 1024LL*1024*1024*1024*1024*1024,-
67};-
68#define SCALE_LENGTH (sizeof(units)/sizeof(units[0]))-
69-
70#define MAX_DIGITS (SCALE_LENGTH * 3) /* XXX strlen(sprintf("%lld", -1)? */-
71-
72/* Convert the given input string "scaled" into numeric in "result".-
73 * Return 0 on success, -1 and errno set on error.-
74 */-
75int-
76scan_scaled(char *scaled, long long *result)-
77{-
78 char *p = scaled;-
79 int sign = 0;-
80 unsigned int i, ndigits = 0, fract_digits = 0;-
81 long long scale_fact = 1, whole = 0, fpart = 0;-
82-
83 /* Skip leading whitespace */-
84 while (isascii((unsigned char)*p) && isspace((unsigned char)*p))
((( (unsigned ...& ~0x7f) == 0)Description
TRUEnever evaluated
FALSEnever evaluated
((*__ctype_b_l...int) _ISspace)Description
TRUEnever evaluated
FALSEnever evaluated
0
85 ++p;
never executed: ++p;
0
86-
87 /* Then at most one leading + or - */-
88 while (*p == '-' || *p == '+') {
*p == '-'Description
TRUEnever evaluated
FALSEnever evaluated
*p == '+'Description
TRUEnever evaluated
FALSEnever evaluated
0
89 if (*p == '-') {
*p == '-'Description
TRUEnever evaluated
FALSEnever evaluated
0
90 if (sign) {
signDescription
TRUEnever evaluated
FALSEnever evaluated
0
91 errno = EINVAL;-
92 return -1;
never executed: return -1;
0
93 }-
94 sign = -1;-
95 ++p;-
96 } else if (*p == '+') {
never executed: end of block
*p == '+'Description
TRUEnever evaluated
FALSEnever evaluated
0
97 if (sign) {
signDescription
TRUEnever evaluated
FALSEnever evaluated
0
98 errno = EINVAL;-
99 return -1;
never executed: return -1;
0
100 }-
101 sign = +1;-
102 ++p;-
103 }
never executed: end of block
0
104 }
never executed: end of block
0
105-
106 /* Main loop: Scan digits, find decimal point, if present.-
107 * We don't allow exponentials, so no scientific notation-
108 * (but note that E for Exa might look like e to some!).-
109 * Advance 'p' to end, to get scale factor.-
110 */-
111 for (; isascii((unsigned char)*p) &&
((( (unsigned ...& ~0x7f) == 0)Description
TRUEnever evaluated
FALSEnever evaluated
0
112 (isdigit((unsigned char)*p) || *p=='.'); ++p) {
((*__ctype_b_l...int) _ISdigit)Description
TRUEnever evaluated
FALSEnever evaluated
*p=='.'Description
TRUEnever evaluated
FALSEnever evaluated
0
113 if (*p == '.') {
*p == '.'Description
TRUEnever evaluated
FALSEnever evaluated
0
114 if (fract_digits > 0) { /* oops, more than one '.' */
fract_digits > 0Description
TRUEnever evaluated
FALSEnever evaluated
0
115 errno = EINVAL;-
116 return -1;
never executed: return -1;
0
117 }-
118 fract_digits = 1;-
119 continue;
never executed: continue;
0
120 }-
121-
122 i = (*p) - '0'; /* whew! finally a digit we can use */-
123 if (fract_digits > 0) {
fract_digits > 0Description
TRUEnever evaluated
FALSEnever evaluated
0
124 if (fract_digits >= MAX_DIGITS-1)
fract_digits >...ts[0])) * 3)-1Description
TRUEnever evaluated
FALSEnever evaluated
0
125 /* ignore extra fractional digits */-
126 continue;
never executed: continue;
0
127 fract_digits++; /* for later scaling */-
128 if (fpart > LLONG_MAX / 10) {
fpart > 0x7fff...fffffffLL / 10Description
TRUEnever evaluated
FALSEnever evaluated
0
129 errno = ERANGE;-
130 return -1;
never executed: return -1;
0
131 }-
132 fpart *= 10;-
133 if (i > LLONG_MAX - fpart) {
i > 0x7fffffff...ffffLL - fpartDescription
TRUEnever evaluated
FALSEnever evaluated
0
134 errno = ERANGE;-
135 return -1;
never executed: return -1;
0
136 }-
137 fpart += i;-
138 } else { /* normal digit */
never executed: end of block
0
139 if (++ndigits >= MAX_DIGITS) {
++ndigits >= (...nits[0])) * 3)Description
TRUEnever evaluated
FALSEnever evaluated
0
140 errno = ERANGE;-
141 return -1;
never executed: return -1;
0
142 }-
143 if (whole > LLONG_MAX / 10) {
whole > 0x7fff...fffffffLL / 10Description
TRUEnever evaluated
FALSEnever evaluated
0
144 errno = ERANGE;-
145 return -1;
never executed: return -1;
0
146 }-
147 whole *= 10;-
148 if (i > LLONG_MAX - whole) {
i > 0x7fffffff...ffffLL - wholeDescription
TRUEnever evaluated
FALSEnever evaluated
0
149 errno = ERANGE;-
150 return -1;
never executed: return -1;
0
151 }-
152 whole += i;-
153 }
never executed: end of block
0
154 }-
155-
156 if (sign) {
signDescription
TRUEnever evaluated
FALSEnever evaluated
0
157 whole *= sign;-
158 fpart *= sign;-
159 }
never executed: end of block
0
160-
161 /* If no scale factor given, we're done. fraction is discarded. */-
162 if (!*p) {
!*pDescription
TRUEnever evaluated
FALSEnever evaluated
0
163 *result = whole;-
164 return 0;
never executed: return 0;
0
165 }-
166-
167 /* Validate scale factor, and scale whole and fraction by it. */-
168 for (i = 0; i < SCALE_LENGTH; i++) {
i < (sizeof(un...eof(units[0]))Description
TRUEnever evaluated
FALSEnever evaluated
0
169-
170 /* Are we there yet? */-
171 if (*p == scale_chars[i] ||
*p == scale_chars[i]Description
TRUEnever evaluated
FALSEnever evaluated
0
172 *p == tolower((unsigned char)scale_chars[i])) {
never executed: end of block
never executed: __res = tolower ( (unsigned char)scale_chars[i] );
never executed: __res = (*__ctype_tolower_loc ())[(int) ( (unsigned char)scale_chars[i] )];
sizeof ( (unsi...chars[i] ) > 1Description
TRUEnever evaluated
FALSEnever evaluated
__builtin_cons...ale_chars[i] )Description
TRUEnever evaluated
FALSEnever evaluated
*p == (__exten...)]; __res; }))Description
TRUEnever evaluated
FALSEnever evaluated
__c < -128Description
TRUEnever evaluated
FALSEnever evaluated
__c > 255Description
TRUEnever evaluated
FALSEnever evaluated
0
173-
174 /* If it ends with alphanumerics after the scale char, bad. */-
175 if (isalnum((unsigned char)*(p+1))) {
((*__ctype_b_l...int) _ISalnum)Description
TRUEnever evaluated
FALSEnever evaluated
0
176 errno = EINVAL;-
177 return -1;
never executed: return -1;
0
178 }-
179 scale_fact = scale_factors[i];-
180-
181 /* check for overflow and underflow after scaling */-
182 if (whole > LLONG_MAX / scale_fact ||
whole > 0x7fff...L / scale_factDescription
TRUEnever evaluated
FALSEnever evaluated
0
183 whole < LLONG_MIN / scale_fact) {
whole < (-0x7f...) / scale_factDescription
TRUEnever evaluated
FALSEnever evaluated
0
184 errno = ERANGE;-
185 return -1;
never executed: return -1;
0
186 }-
187-
188 /* scale whole part */-
189 whole *= scale_fact;-
190-
191 /* truncate fpart so it doesn't overflow.-
192 * then scale fractional part.-
193 */-
194 while (fpart >= LLONG_MAX / scale_fact) {
fpart >= 0x7ff...L / scale_factDescription
TRUEnever evaluated
FALSEnever evaluated
0
195 fpart /= 10;-
196 fract_digits--;-
197 }
never executed: end of block
0
198 fpart *= scale_fact;-
199 if (fract_digits > 0) {
fract_digits > 0Description
TRUEnever evaluated
FALSEnever evaluated
0
200 for (i = 0; i < fract_digits -1; i++)
i < fract_digits -1Description
TRUEnever evaluated
FALSEnever evaluated
0
201 fpart /= 10;
never executed: fpart /= 10;
0
202 }
never executed: end of block
0
203 whole += fpart;-
204 *result = whole;-
205 return 0;
never executed: return 0;
0
206 }-
207 }
never executed: end of block
0
208-
209 /* Invalid unit or character */-
210 errno = EINVAL;-
211 return -1;
never executed: return -1;
0
212}-
213-
214/* Format the given "number" into human-readable form in "result".-
215 * Result must point to an allocated buffer of length FMT_SCALED_STRSIZE.-
216 * Return 0 on success, -1 and errno set if error.-
217 */-
218int-
219fmt_scaled(long long number, char *result)-
220{-
221 long long abval, fract = 0;-
222 unsigned int i;-
223 unit_type unit = NONE;-
224-
225 abval = llabs(number);-
226-
227 /* Not every negative long long has a positive representation.-
228 * Also check for numbers that are just too darned big to format-
229 */-
230 if (abval < 0 || abval / 1024 >= scale_factors[SCALE_LENGTH-1]) {
abval < 0Description
TRUEnever evaluated
FALSEnever evaluated
abval / 1024 >...(units[0]))-1]Description
TRUEnever evaluated
FALSEnever evaluated
0
231 errno = ERANGE;-
232 return -1;
never executed: return -1;
0
233 }-
234-
235 /* scale whole part; get unscaled fraction */-
236 for (i = 0; i < SCALE_LENGTH; i++) {
i < (sizeof(un...eof(units[0]))Description
TRUEnever evaluated
FALSEnever evaluated
0
237 if (abval/1024 < scale_factors[i]) {
abval/1024 < scale_factors[i]Description
TRUEnever evaluated
FALSEnever evaluated
0
238 unit = units[i];-
239 fract = (i == 0) ? 0 : abval % scale_factors[i];
(i == 0)Description
TRUEnever evaluated
FALSEnever evaluated
0
240 number /= scale_factors[i];-
241 if (i > 0)
i > 0Description
TRUEnever evaluated
FALSEnever evaluated
0
242 fract /= scale_factors[i - 1];
never executed: fract /= scale_factors[i - 1];
0
243 break;
never executed: break;
0
244 }-
245 }
never executed: end of block
0
246-
247 fract = (10 * fract + 512) / 1024;-
248 /* if the result would be >= 10, round main number */-
249 if (fract >= 10) {
fract >= 10Description
TRUEnever evaluated
FALSEnever evaluated
0
250 if (number >= 0)
number >= 0Description
TRUEnever evaluated
FALSEnever evaluated
0
251 number++;
never executed: number++;
0
252 else-
253 number--;
never executed: number--;
0
254 fract = 0;-
255 } else if (fract < 0) {
never executed: end of block
fract < 0Description
TRUEnever evaluated
FALSEnever evaluated
0
256 /* shouldn't happen */-
257 fract = 0;-
258 }
never executed: end of block
0
259-
260 if (number == 0)
number == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
261 strlcpy(result, "0B", FMT_SCALED_STRSIZE);
never executed: strlcpy(result, "0B", 7);
0
262 else if (unit == NONE || number >= 100 || number <= -100) {
unit == NONEDescription
TRUEnever evaluated
FALSEnever evaluated
number >= 100Description
TRUEnever evaluated
FALSEnever evaluated
number <= -100Description
TRUEnever evaluated
FALSEnever evaluated
0
263 if (fract >= 5) {
fract >= 5Description
TRUEnever evaluated
FALSEnever evaluated
0
264 if (number >= 0)
number >= 0Description
TRUEnever evaluated
FALSEnever evaluated
0
265 number++;
never executed: number++;
0
266 else-
267 number--;
never executed: number--;
0
268 }-
269 (void)snprintf(result, FMT_SCALED_STRSIZE, "%lld%c",-
270 number, scale_chars[unit]);-
271 } else
never executed: end of block
0
272 (void)snprintf(result, FMT_SCALED_STRSIZE, "%lld.%1lld%c",
never executed: (void)snprintf(result, 7, "%lld.%1lld%c", number, fract, scale_chars[unit]);
0
273 number, fract, scale_chars[unit]);
never executed: (void)snprintf(result, 7, "%lld.%1lld%c", number, fract, scale_chars[unit]);
0
274-
275 return 0;
never executed: return 0;
0
276}-
277-
278#ifdef MAIN-
279/*-
280 * This is the original version of the program in the man page.-
281 * Copy-and-paste whatever you need from it.-
282 */-
283int-
284main(int argc, char **argv)-
285{-
286 char *cinput = "1.5K", buf[FMT_SCALED_STRSIZE];-
287 long long ninput = 10483892, result;-
288-
289 if (scan_scaled(cinput, &result) == 0)-
290 printf("\"%s\" -> %lld\n", cinput, result);-
291 else-
292 perror(cinput);-
293-
294 if (fmt_scaled(ninput, buf) == 0)-
295 printf("%lld -> \"%s\"\n", ninput, buf);-
296 else-
297 fprintf(stderr, "%lld invalid (%s)\n", ninput, strerror(errno));-
298-
299 return 0;-
300}-
301#endif-
302-
303#endif /* HAVE_FMT_SCALED */-
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