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libbb: factor out hex2bin() for infiniband address parser

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function                                             old     new   delta
hex2bin                                                -     149    +149
in_ib                                                172      27    -145

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2010-04-04 15:29:32 +02:00
parent c03602baa4
commit 4836331924
4 changed files with 46 additions and 49 deletions
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35
libbb/xfuncs.c
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@ -122,6 +122,41 @@ char* FAST_FUNC bin2hex(char *p, const char *cp, int count)
return p;
}
/* Convert "[x]x[:][x]x[:][x]x[:][x]x" hex string to binary, no more than COUNT bytes */
char* FAST_FUNC hex2bin(char *dst, const char *str, int count)
{
errno = EINVAL;
while (*str && count) {
uint8_t val;
uint8_t c = *str++;
if (isdigit(c))
val = c - '0';
else if ((c|0x20) >= 'a' && (c|0x20) <= 'f')
val = (c|0x20) - ('a' - 10);
else
return NULL;
val <<= 4;
c = *str;
if (isdigit(c))
val |= c - '0';
else if ((c|0x20) >= 'a' && (c|0x20) <= 'f')
val |= (c|0x20) - ('a' - 10);
else if (c == ':' || c == '\0')
val >>= 4;
else
return NULL;
*dst++ = val;
if (c != '\0')
str++;
if (*str == ':')
str++;
count--;
}
errno = (*str ? ERANGE : 0);
return dst;
}
/* Return how long the file at fd is, if there's any way to determine it. */
#ifdef UNUSED
off_t FAST_FUNC fdlength(int fd)