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-rw-r--r--libc/inet/addr.c44
1 files changed, 33 insertions, 11 deletions
diff --git a/libc/inet/addr.c b/libc/inet/addr.c
index 142363ccc..a05a4288d 100644
--- a/libc/inet/addr.c
+++ b/libc/inet/addr.c
@@ -3,6 +3,15 @@
* under the GNU Library General Public License.
*/
+/*
+ * Manuel Novoa III Dec 2000
+ *
+ * Converted to use my new (un)signed long (long) to string routines, which
+ * are smaller than the previous functions and don't require static buffers.
+ * In the process, removed the reference to strcat and cut object size of
+ * inet_ntoa in half (from 190 bytes down to 94).
+ */
+
#include <string.h>
#include <ctype.h>
#include <netinet/in.h>
@@ -63,22 +72,35 @@ const char *cp;
#ifdef L_inet_ntoa
-extern char *itoa(int);
+#include <limits.h>
+
+#if (ULONG_MAX >> 32)
+/* We're set up for 32 bit unsigned longs */
+#error need to check size allocation for static buffer 'buf'
+#endif
+
+extern char *__ultostr(char *buf, unsigned long uval, int base, int uppercase);
char *inet_ntoa(in)
struct in_addr in;
{
- static char buf[18];
- unsigned long addr = ntohl(in.s_addr);
+ static char buf[16]; /* max 12 digits + 3 '.'s + 1 nul */
- strcpy(buf, itoa((addr >> 24) & 0xff));
- strcat(buf, ".");
- strcat(buf, itoa((addr >> 16) & 0xff));
- strcat(buf, ".");
- strcat(buf, itoa((addr >> 8) & 0xff));
- strcat(buf, ".");
- strcat(buf, itoa(addr & 0xff));
+ unsigned long addr = ntohl(in.s_addr);
+ int i;
+ char *p, *q;
+
+ q = 0;
+ p = buf + sizeof(buf) - 1;
+ for (i=0 ; i < 4 ; i++ ) {
+ p = __ultostr(p, addr & 0xff, 10, 0 ) - 1;
+ addr >>= 8;
+ if (q) {
+ *q = '.';
+ }
+ q = p;
+ }
- return buf;
+ return p+1;
}
#endif