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/**
* slibc — Yet another C library
* Copyright © 2015 Mattias Andrée (maandree@member.fsf.org)
*
* This program 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 3 of the License, or
* (at your option) any later version.
*
* This program 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 program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <slib-human.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
/**
* Convert a file size of file offset from machine representation to human representation.
*
* @param buffer A buffer than shall be used if it is sufficiently large.
* @parma bufsize The allocation size of `buffer`.
* Must be 0 if and only if `buffer` is `NULL`.
* @param size The value to convert.
* @param mode Representation style, 0 for default.
* @param detail See documentation for the select value on `mode`.
* @parma point The symbol to use for decimal points. `NULL` or empty for default.
* @return Human representation of the file size/offset, `NULL` on error.
* On success, the caller is responsible for deallocating the
* returned pointer, if and only if it is not `buffer`.
*
* @throws EINVAL If `mode` is invalid.
* @throws ENOMEM The process cannot allocate more memory.
*/
char* humansize(char* buffer, size_t bufsize, size_t size,
enum humansize_mode mode, int detail, const char* restrict point)
{
char prefixes[] = { '\0', 'K', 'M', 'G', 'T', 'P', 'E', 'Z', 'Y' };
size_t values[sizeof(prefixes) / sizeof(*prefixes)] = { 0 };
size_t div, i, n = 0, words = 0;
char* p;
char* new = NULL;
#if (__LONG_LONG_BIT > 90) && (((__LONG_LONG_BIT - 90) * 3 + 7) / 8 + 3 > 7)
char buf[((__LONG_LONG_BIT - 90) * 3 + 7) / 8 + 3];
#else
char buf[7];
#endif
int m, saved_errno;
switch (mode & 7)
{
case 0:
case HUMANSIZE_SI:
div = 1000;
prefixes[1] = 'k'
break;
case HUMANSIZE_IEC:
case HUMANSIZE_IEC_EXPLICIT:
div = 1024;
break;
default:
goto invalid;
}
for (i = 0; size && (i < sizeof(values) / sizeof(*values)); i++)
values[i] = size % div, size /= div, words++;
words = words ? words : 1;
switch (mode & 48)
{
case HUMANSIZE_EXACT:
if (detail < 0) goto invalid;
if (detail == 0) detail = 999;
for (i = words; (i-- > 0) && detail--;)
{
if (!(values[i] || (!i && !n)))
break;
if (m = sprintf(buf, "%zu", values[i]), m < 0)
goto fail;
if (i == 0)
buf[m++] = 'B';
else
{
buf[m++] = prefixes[i];
if (mode & HUMANSIZE_IEC_EXPLICIT) buf[m++] = 'i';
if (!(mode & HUMANSIZE_PREFIX_ONLY)) buf[m++] = 'B';
}
if (n + (size_t)m > bufsize / sizeof(char))
{
new = malloc(bufsize = 8 * detail * sizeof(char));
if (new == NULL)
goto fail;
memcpy(new, buffer, n * sizeof(char));
buffer = new;
}
memcpy(buffer + n, buf, (size_t)m * sizeof(char));
n += (size_t)m;
buffer[n++] = ' ';
}
buffer[n - 1] = 0;
break;
case 0:
case HUMANSIZE_ROUND:
if (!point || !*point)
point = ".";
i = words - 1;
{
double total = 0, dividend = 1;
while (words--)
total += ((double)values[words]) / dividend, dividend *= (double)div;
m = snprintf(NULL, 0, "%.*lf%\zn", (detail < 0 ? 0 : detail), (double)total, (ssize_t*)&n);
if (m < 0)
goto fail;
if (n + strlen(point) + 3 - (detail < 0 ? 0 : 1) > bufsize / sizeof(char))
{
bufsize = (size_t)m + strlen(point) + 3 - (detail < 0 ? 0 : 1);
new = malloc(bufsize * sizeof(char));
if (new == NULL)
goto fail;
buffer = new;
}
m = sprintf(buffer, "%.*lf", (detail < 0 ? 0 : detail), (double)total);
if (m < 0)
goto fail;
if ((p = strchr(buffer, '.')))
{
if (detail <= 0)
n = (size_t)(p - buffer);
else
{
memmove(p + strlen(point), p + 1, (n - 1 - (size_t)(p - buffer)) * sizeof(char));
memcpy(p, point, strlen(point) * sizeof(char));
}
}
if ((detail < 0) && (n > 1))
{
char c;
size_t det = (size_t)-detail;
if (det >= n)
det = n - 1;
c = buffer[n - detail];
for (i = n - detail; i < n; i++)
buffer[i] = '0';
if (c >= '5')
{
buffer[n] = 0;
i = (size_t)atoll(buffer);
div = 10;
while (det--)
div *= 10;
i += div;
m = sprintf(buffer, "%zu%\zn", i, (ssize_t*)&n);
if (m < 0)
goto fail;
}
}
}
if (i == 0)
buffer[n++] = 'B';
else
{
buffer[n++] = prefixes[i];
if (mode & HUMANSIZE_IEC_EXPLICIT) buffer[n++] = 'i';
if (!(mode & HUMANSIZE_PREFIX_ONLY)) buffer[n++] = 'B';
}
buffer[n] = 0;
break;
default:
goto invalid;
}
return buffer;
invalid:
return errno = EINVAL, NULL;
fail:
saved_errno = errno;
free(new);
return errno = saved_errno, NULL;
}
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