/*
* Copyright (C) 2010 Karel Zak <kzak@redhat.com>
* Copyright (C) 2010 Davidlohr Bueso <dave@gnu.org>
*/
#include <stdio.h>
#include <stdlib.h>
#include <inttypes.h>
#include <ctype.h>
#include <errno.h>
#include <err.h>
#include <sys/stat.h>
#include <locale.h>
#include <string.h>
static int do_scale_by_power (uintmax_t *x, int base, int power)
{
while (power--) {
if (UINTMAX_MAX / base < *x)
return -2;
*x *= base;
}
return 0;
}
/*
* strtosize() - convert string to size (uintmax_t).
*
* Supported suffixes:
*
* XiB or X for 2^N
* where X = {K,M,G,T,P,E,Y,Z}
* or X = {k,m,g,t,p,e} (undocumented for backward compatibility only)
* for example:
* 10KiB = 10240
* 10K = 10240
*
* XB for 10^N
* where X = {K,M,G,T,P,E,Y,Z}
* for example:
* 10KB = 10000
*
* Note that the function does not accept numbers with '-' (negative sign)
* prefix.
*/
int strtosize(const char *str, uintmax_t *res)
{
char *p;
uintmax_t x;
int base = 1024, rc = 0;
*res = 0;
if (!str || !*str)
goto err;
/* Only positive numbers are acceptable
*
* Note that this check is not perfect, it would be better to
* use lconv->negative_sign. But coreutils use the same solution,
* so it's probably good enough...
*/
p = (char *) str;
while (isspace((unsigned char) *p))
p++;
if (*p == '-')
goto err;
p = NULL;
errno = 0;
x = strtoumax(str, &p, 0);
if (p == str ||
(errno != 0 && (x == UINTMAX_MAX || x == 0)))
goto err;
if (!p || !*p)
goto done; /* without suffix */
/*
* Check size suffixes
*/
if (*(p + 1) == 'i' && *(p + 2) == 'B' && !*(p + 3))
base = 1024; /* XiB, 2^N */
else if (*(p + 1) == 'B' && !*(p + 2))
base = 1000; /* XB, 10^N */
else if (*(p + 1))
goto err; /* unexpected suffix */
switch(*p) {
case 'K':
case 'k':
rc = do_scale_by_power(&x, base, 1);
break;
case 'M':
case 'm':
rc = do_scale_by_power(&x, base, 2);
break;
case 'G':
case 'g':
rc = do_scale_by_power(&x, base, 3);
break;
case 'T':
case 't':
rc = do_scale_by_power(&x, base, 4);
break;
case 'P':
case 'p':
rc = do_scale_by_power(&x, base, 5);
break;
case 'E':
case 'e':
rc = do_scale_by_power(&x, base, 6);
break;
case 'Z':
rc = do_scale_by_power(&x, base, 7);
break;
case 'Y':
rc = do_scale_by_power(&x, base, 8);
break;
default:
goto err;
}
done:
*res = x;
return rc;
err:
return -1;
}
#ifndef HAVE_STRNLEN
size_t strnlen(const char *s, size_t maxlen)
{
int i;
for (i = 0; i < maxlen; i++) {
if (s[i] == '\0')
return i + 1;
}
return maxlen;
}
#endif
#ifndef HAVE_STRNCHR
char *strnchr(const char *s, size_t maxlen, int c)
{
for (; maxlen-- && *s != '\0'; ++s)
if (*s == (char)c)
return (char *)s;
return NULL;
}
#endif
#ifndef HAVE_STRNDUP
char *strndup(const char *s, size_t n)
{
size_t len = strnlen(s, n);
char *new = (char *) malloc((len + 1) * sizeof(char));
if (!new)
return NULL;
new[len] = '\0';
return (char *) memcpy(new, s, len);
}
#endif
/*
* same as strtol(3) but exit on failure instead of returning crap
*/
long strtol_or_err(const char *str, const char *errmesg)
{
long num;
char *end = NULL;
if (str == NULL || *str == '\0')
goto err;
errno = 0;
num = strtol(str, &end, 10);
if (errno || (end && *end))
goto err;
return num;
err:
if (errno)
err(EXIT_FAILURE, "%s: '%s'", errmesg, str);
else
errx(EXIT_FAILURE, "%s: '%s'", errmesg, str);
return 0;
}
/*
* Converts stat->st_mode to ls(1)-like mode string. The size of "str" must
* be 10 bytes.
*/
void strmode(mode_t mode, char *str)
{
if (S_ISDIR(mode))
str[0] = 'd';
else if (S_ISLNK(mode))
str[0] = 'l';
else if (S_ISCHR(mode))
str[0] = 'c';
else if (S_ISBLK(mode))
str[0] = 'b';
else if (S_ISSOCK(mode))
str[0] = 's';
else if (S_ISFIFO(mode))
str[0] = 'p';
else if (S_ISREG(mode))
str[0] = '-';
str[1] = mode & S_IRUSR ? 'r' : '-';
str[2] = mode & S_IWUSR ? 'w' : '-';
str[3] = (mode & S_ISUID
? (mode & S_IXUSR ? 's' : 'S')
: (mode & S_IXUSR ? 'x' : '-'));
str[4] = mode & S_IRGRP ? 'r' : '-';
str[5] = mode & S_IWGRP ? 'w' : '-';
str[6] = (mode & S_ISGID
? (mode & S_IXGRP ? 's' : 'S')
: (mode & S_IXGRP ? 'x' : '-'));
str[7] = mode & S_IROTH ? 'r' : '-';
str[8] = mode & S_IWOTH ? 'w' : '-';
str[9] = (mode & S_ISVTX
? (mode & S_IXOTH ? 't' : 'T')
: (mode & S_IXOTH ? 'x' : '-'));
str[10] = '\0';
}
/*
* returns exponent (2^x=n) in range KiB..PiB
*/
static int get_exp(uint64_t n)
{
int shft;
for (shft = 10; shft <= 60; shft += 10) {
if (n < (1ULL << shft))
break;
}
return shft - 10;
}
char *size_to_human_string(uint64_t bytes)
{
char buf[32];
int dec, frac, exp;
const char *letters = "BKMGTP";
char c;
exp = get_exp(bytes);
c = *(letters + (exp ? exp / 10 : 0));
dec = exp ? bytes / (1ULL << exp) : bytes;
frac = exp ? bytes % (1ULL << exp) : 0;
if (frac) {
/* round */
frac = (frac / (1ULL << (exp - 10)) + 50) / 100;
if (frac == 10)
dec++, frac = 0;
}
if (frac) {
struct lconv const *l = localeconv();
char *dp = l ? l->decimal_point : NULL;
if (!dp || !*dp)
dp = ".";
snprintf(buf, sizeof(buf), "%d%s%d%c", dec, dp, frac, c);
} else
snprintf(buf, sizeof(buf), "%d%c", dec, c);
return strdup(buf);
}
