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>

1 files changed, 4 insertions, 2 deletions

diff --git a/networking/wget.c b/networking/wget.c
index 5b73b933b..97f4a8f6e 100644
--- a/networking/wget.c
+++ b/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 != ':')