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glibc/resolv/ns_ttl.c
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/* | |
* Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") | |
* 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. | |
*/ | |
#if !defined(_LIBC) && !defined(lint) | |
static const char rcsid[] = "$BINDId: ns_ttl.c,v 8.8 1999/10/13 16:39:36 vixie Exp $"; | |
#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); | |
} | |
libresolv_hidden_def (ns_format_ttl) | |
// Seems not to be needed. It's not exported from the DSO. Some libresolv.a | |
// might depend on it so we let it in. | |
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; | |
} else if (!dirty) | |
goto einval; | |
*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); | |
} | |
/*! \file */ |