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Introduce fls() helper

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This is needed for virtio.  The implementation is originally from 
Marcelo Tosatti.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>



git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5868 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
aliguori 2008-12-04 19:19:45 +00:00
parent 9b3469cc9a
commit b39ade83c2
2 changed files with 12 additions and 0 deletions
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11
cutils.c
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@ -95,3 +95,14 @@ time_t mktimegm(struct tm *tm)
t += 3600 * tm->tm_hour + 60 * tm->tm_min + tm->tm_sec; t += 3600 * tm->tm_hour + 60 * tm->tm_min + tm->tm_sec;
return t; return t;
} }
int fls(int i)
{
int bit;
for (bit=31; bit >= 0; bit--)
if (i & (1 << bit))
return bit+1;
return 0;
}

1
qemu-common.h
View File

@ -94,6 +94,7 @@ char *pstrcat(char *buf, int buf_size, const char *s);
int strstart(const char *str, const char *val, const char **ptr); int strstart(const char *str, const char *val, const char **ptr);
int stristart(const char *str, const char *val, const char **ptr); int stristart(const char *str, const char *val, const char **ptr);
time_t mktimegm(struct tm *tm); time_t mktimegm(struct tm *tm);
int fls(int i);
#define qemu_isalnum(c) isalnum((unsigned char)(c)) #define qemu_isalnum(c) isalnum((unsigned char)(c))
#define qemu_isalpha(c) isalpha((unsigned char)(c)) #define qemu_isalpha(c) isalpha((unsigned char)(c))