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Diffstat (limited to 'resolv/ns_ttl.c')
-rw-r--r--resolv/ns_ttl.c154
1 files changed, 154 insertions, 0 deletions
diff --git a/resolv/ns_ttl.c b/resolv/ns_ttl.c
new file mode 100644
index 0000000000..6be2b0d7a7
--- /dev/null
+++ b/resolv/ns_ttl.c
@@ -0,0 +1,154 @@
+/*
+ * Copyright (c) 1996,1999 by Internet Software Consortium.
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
+ * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
+ * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
+ * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
+ * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
+ * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
+ * SOFTWARE.
+ */
+
+#ifndef lint
+static const char rcsid[] = "$Id$";
+#endif
+
+/* Import. */
+#include <arpa/nameser.h>
+
+#include <ctype.h>
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+
+#ifdef SPRINTF_CHAR
+# define SPRINTF(x) strlen(sprintf/**/x)
+#else
+# define SPRINTF(x) ((size_t)sprintf x)
+#endif
+
+/* Forward. */
+
+static int fmt1(int t, char s, char **buf, size_t *buflen);
+
+/* Macros. */
+
+#define T(x) if ((x) < 0) return (-1); else (void)NULL
+
+/* Public. */
+
+int
+ns_format_ttl(u_long src, char *dst, size_t dstlen) {
+ char *odst = dst;
+ int secs, mins, hours, days, weeks, x;
+ char *p;
+
+ secs = src % 60; src /= 60;
+ mins = src % 60; src /= 60;
+ hours = src % 24; src /= 24;
+ days = src % 7; src /= 7;
+ weeks = src; src = 0;
+
+ x = 0;
+ if (weeks) {
+ T(fmt1(weeks, 'W', &dst, &dstlen));
+ x++;
+ }
+ if (days) {
+ T(fmt1(days, 'D', &dst, &dstlen));
+ x++;
+ }
+ if (hours) {
+ T(fmt1(hours, 'H', &dst, &dstlen));
+ x++;
+ }
+ if (mins) {
+ T(fmt1(mins, 'M', &dst, &dstlen));
+ x++;
+ }
+ if (secs || !(weeks || days || hours || mins)) {
+ T(fmt1(secs, 'S', &dst, &dstlen));
+ x++;
+ }
+
+ if (x > 1) {
+ int ch;
+
+ for (p = odst; (ch = *p) != '\0'; p++)
+ if (isascii(ch) && isupper(ch))
+ *p = tolower(ch);
+ }
+
+ return (dst - odst);
+}
+
+int
+ns_parse_ttl(const char *src, u_long *dst) {
+ u_long ttl, tmp;
+ int ch, digits, dirty;
+
+ ttl = 0;
+ tmp = 0;
+ digits = 0;
+ dirty = 0;
+ while ((ch = *src++) != '\0') {
+ if (!isascii(ch) || !isprint(ch))
+ goto einval;
+ if (isdigit(ch)) {
+ tmp *= 10;
+ tmp += (ch - '0');
+ digits++;
+ continue;
+ }
+ if (digits == 0)
+ goto einval;
+ if (islower(ch))
+ ch = toupper(ch);
+ switch (ch) {
+ case 'W': tmp *= 7;
+ case 'D': tmp *= 24;
+ case 'H': tmp *= 60;
+ case 'M': tmp *= 60;
+ case 'S': break;
+ default: goto einval;
+ }
+ ttl += tmp;
+ tmp = 0;
+ digits = 0;
+ dirty = 1;
+ }
+ if (digits > 0) {
+ if (dirty)
+ goto einval;
+ else
+ ttl += tmp;
+ }
+ *dst = ttl;
+ return (0);
+
+ einval:
+ __set_errno (EINVAL);
+ return (-1);
+}
+
+/* Private. */
+
+static int
+fmt1(int t, char s, char **buf, size_t *buflen) {
+ char tmp[50];
+ size_t len;
+
+ len = SPRINTF((tmp, "%d%c", t, s));
+ if (len + 1 > *buflen)
+ return (-1);
+ strcpy(*buf, tmp);
+ *buf += len;
+ *buflen -= len;
+ return (0);
+}