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The round of expand_number() cleanups.

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o Fix range error checking to detect overflow when uint64_t < uintmax_t.
o Remove a non-functional check for no valid digits as pointed out by Bruce.
o Remove a rather pointless comment describing what the function does.
o Clean up a bunch of style bugs.

Brucified by:	bde
This commit is contained in:
Sergey Kandaurov 2013-08-30 11:21:52 +00:00
parent f52924b480
commit 8d99b9cebd
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=255069
1 changed files with 11 additions and 30 deletions
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41
lib/libutil/expand_number.c
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@ -35,42 +35,24 @@ __FBSDID("$FreeBSD$");
#include <libutil.h>
#include <stdint.h>
/*
* Convert an expression of the following forms to a uint64_t.
* 1) A positive decimal number.
* 2) A positive decimal number followed by a 'b' or 'B' (mult by 1).
* 3) A positive decimal number followed by a 'k' or 'K' (mult by 1 << 10).
* 4) A positive decimal number followed by a 'm' or 'M' (mult by 1 << 20).
* 5) A positive decimal number followed by a 'g' or 'G' (mult by 1 << 30).
* 6) A positive decimal number followed by a 't' or 'T' (mult by 1 << 40).
* 7) A positive decimal number followed by a 'p' or 'P' (mult by 1 << 50).
* 8) A positive decimal number followed by a 'e' or 'E' (mult by 1 << 60).
*/
int
expand_number(const char *buf, uint64_t *num)
{
uint64_t number;
int saved_errno;
unsigned shift;
char *endptr;
uintmax_t umaxval;
uint64_t number;
unsigned shift;
int serrno;
saved_errno = errno;
serrno = errno;
errno = 0;
number = strtoumax(buf, &endptr, 0);
if (number == UINTMAX_MAX && errno == ERANGE) {
umaxval = strtoumax(buf, &endptr, 0);
if (umaxval > UINT64_MAX)
errno = ERANGE;
if (errno != 0)
return (-1);
}
if (errno == 0)
errno = saved_errno;
if (endptr == buf) {
/* No valid digits. */
errno = EINVAL;
return (-1);
}
errno = serrno;
number = umaxval;
switch (tolower((unsigned char)*endptr)) {
case 'e':
@ -106,7 +88,6 @@ expand_number(const char *buf, uint64_t *num)
errno = ERANGE;
return (-1);
}
*num = number << shift;
return (0);
}