libbb: factor out hex2bin() for infiniband address parser

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

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

include/libbb.h

@@ -734,6 +734,8 @@ const char *make_human_readable_str(unsigned long long size,
 		unsigned long block_size, unsigned long display_unit) FAST_FUNC;
 /* Put a string of hex bytes ("1b2e66fe"...), return advanced pointer */
 char *bin2hex(char *buf, const char *cp, int count) FAST_FUNC;
+/* Reverse */
+char* hex2bin(char *dst, const char *str, int count) FAST_FUNC;
 
 /* Generate a UUID */
 void generate_uuid(uint8_t *buf) FAST_FUNC;

libbb/xfuncs.c

@@ -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)

networking/interface.c

@@ -30,7 +30,6 @@
  *	    20001008 - Bernd Eckenfels, Patch from RH for setting mtu
  *			(default AF was wrong)
  */
-
 #include <net/if.h>
 #include <net/if_arp.h>
 #if (defined(__GLIBC__) && __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 1) || defined(_NEWLIB_VERSION)
@@ -1215,53 +1214,12 @@ static int if_print(char *ifname)
 /* Input an Infiniband address and convert to binary. */
 int FAST_FUNC in_ib(const char *bufp, struct sockaddr *sap)
 {
-	unsigned char *ptr;
-	char c;
-	const char *orig;
-	int i;
-	unsigned val;
-
 	sap->sa_family = ib_hwtype.type;
-	ptr = (unsigned char *) sap->sa_data;
-
-	i = 0;
-	orig = bufp;
-	while ((*bufp != '\0') && (i < INFINIBAND_ALEN)) {
-		val = 0;
-		c = *bufp++;
-		if (isdigit(c))
-			val = c - '0';
-		else if ((c|0x20) >= 'a' && (c|0x20) <= 'f')
-			val = (c|0x20) - ('a' - 10);
-		else {
-			errno = EINVAL;
-			return -1;
-		}
-		val <<= 4;
-		c = *bufp;
-		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 {
-			errno = EINVAL;
-			return -1;
-		}
-		if (c != '\0')
-			bufp++;
-		*ptr++ = (unsigned char) (val & 0377);
-		i++;
-
-		/* We might get a semicolon here - not required. */
-		if (*bufp == ':') {
-			bufp++;
-		}
-	}
-#ifdef DEBUG
-	fprintf(stderr, "in_ib(%s): %s\n", orig, UNSPEC_print(sap->sa_data));
-#endif
+//TODO: error check?
+	hex2bin((char*)sap->sa_data, bufp, INFINIBAND_ALEN);
+# ifdef HWIB_DEBUG
+	fprintf(stderr, "in_ib(%s): %s\n", bufp, UNSPEC_print(sap->sa_data));
+# endif
 	return 0;
 }
 #endif

networking/wget.c

@@ -282,8 +282,10 @@ static char *gethdr(char *buf, size_t bufsiz, FILE *fp /*, int *istrunc*/)
 		return NULL;
 
 	/* convert the header name to lower case */
-	for (s = buf; isalnum(*s) || *s == '-' || *s == '.'; ++s)
-		*s = tolower(*s);
+	for (s = buf; isalnum(*s) || *s == '-' || *s == '.'; ++s) {
+		/* tolower for "A-Z", no-op for "0-9a-z-." */
+		*s = (*s | 0x20);
+	}
 
 	/* verify we are at the end of the header name */
 	if (*s != ':')