1 | /* |
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2 | * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") |
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3 | * Copyright (c) 1996,1999 by Internet Software Consortium. |
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4 | * |
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5 | * Permission to use, copy, modify, and distribute this software for any |
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6 | * purpose with or without fee is hereby granted, provided that the above |
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7 | * copyright notice and this permission notice appear in all copies. |
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8 | * |
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9 | * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES |
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10 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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11 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR |
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12 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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13 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
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14 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT |
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15 | * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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16 | */ |
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17 | |
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18 | #ifndef lint |
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19 | static const char rcsid[] = "$Id: ns_ttl.c,v 1.2.18.2 2005/07/28 07:38:10 marka Exp $"; |
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20 | #endif |
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21 | |
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22 | /* Import. */ |
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23 | |
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24 | #include "port_before.h" |
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25 | |
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26 | #include <arpa/nameser.h> |
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27 | |
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28 | #include <ctype.h> |
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29 | #include <errno.h> |
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30 | #include <stdio.h> |
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31 | #include <string.h> |
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32 | |
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33 | #include "port_after.h" |
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34 | |
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35 | #ifdef SPRINTF_CHAR |
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36 | # define SPRINTF(x) strlen(sprintf/**/x) |
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37 | #else |
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38 | # define SPRINTF(x) ((size_t)sprintf x) |
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39 | #endif |
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40 | |
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41 | /* Forward. */ |
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42 | |
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43 | static int fmt1(int t, char s, char **buf, size_t *buflen); |
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44 | |
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45 | /* Macros. */ |
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46 | |
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47 | #define T(x) if ((x) < 0) return (-1); else (void)NULL |
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48 | |
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49 | /* Public. */ |
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50 | |
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51 | int |
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52 | ns_format_ttl(u_long src, char *dst, size_t dstlen) { |
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53 | char *odst = dst; |
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54 | int secs, mins, hours, days, weeks, x; |
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55 | char *p; |
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56 | |
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57 | secs = src % 60; src /= 60; |
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58 | mins = src % 60; src /= 60; |
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59 | hours = src % 24; src /= 24; |
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60 | days = src % 7; src /= 7; |
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61 | weeks = src; src = 0; |
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62 | |
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63 | x = 0; |
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64 | if (weeks) { |
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65 | T(fmt1(weeks, 'W', &dst, &dstlen)); |
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66 | x++; |
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67 | } |
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68 | if (days) { |
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69 | T(fmt1(days, 'D', &dst, &dstlen)); |
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70 | x++; |
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71 | } |
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72 | if (hours) { |
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73 | T(fmt1(hours, 'H', &dst, &dstlen)); |
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74 | x++; |
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75 | } |
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76 | if (mins) { |
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77 | T(fmt1(mins, 'M', &dst, &dstlen)); |
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78 | x++; |
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79 | } |
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80 | if (secs || !(weeks || days || hours || mins)) { |
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81 | T(fmt1(secs, 'S', &dst, &dstlen)); |
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82 | x++; |
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83 | } |
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84 | |
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85 | if (x > 1) { |
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86 | int ch; |
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87 | |
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88 | for (p = odst; (ch = *p) != '\0'; p++) |
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89 | if (isascii(ch) && isupper(ch)) |
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90 | *p = tolower(ch); |
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91 | } |
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92 | |
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93 | return (dst - odst); |
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94 | } |
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95 | |
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96 | int |
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97 | ns_parse_ttl(const char *src, u_long *dst) { |
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98 | u_long ttl, tmp; |
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99 | int ch, digits, dirty; |
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100 | |
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101 | ttl = 0; |
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102 | tmp = 0; |
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103 | digits = 0; |
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104 | dirty = 0; |
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105 | while ((ch = *src++) != '\0') { |
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106 | if (!isascii(ch) || !isprint(ch)) |
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107 | goto einval; |
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108 | if (isdigit(ch)) { |
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109 | tmp *= 10; |
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110 | tmp += (ch - '0'); |
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111 | digits++; |
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112 | continue; |
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113 | } |
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114 | if (digits == 0) |
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115 | goto einval; |
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116 | if (islower(ch)) |
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117 | ch = toupper(ch); |
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118 | switch (ch) { |
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119 | case 'W': tmp *= 7; |
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120 | case 'D': tmp *= 24; |
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121 | case 'H': tmp *= 60; |
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122 | case 'M': tmp *= 60; |
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123 | case 'S': break; |
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124 | default: goto einval; |
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125 | } |
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126 | ttl += tmp; |
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127 | tmp = 0; |
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128 | digits = 0; |
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129 | dirty = 1; |
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130 | } |
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131 | if (digits > 0) { |
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132 | if (dirty) |
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133 | goto einval; |
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134 | else |
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135 | ttl += tmp; |
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136 | } else if (!dirty) |
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137 | goto einval; |
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138 | *dst = ttl; |
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139 | return (0); |
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140 | |
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141 | einval: |
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142 | errno = EINVAL; |
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143 | return (-1); |
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144 | } |
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145 | |
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146 | /* Private. */ |
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147 | |
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148 | static int |
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149 | fmt1(int t, char s, char **buf, size_t *buflen) { |
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150 | char tmp[50]; |
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151 | size_t len; |
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152 | |
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153 | len = SPRINTF((tmp, "%d%c", t, s)); |
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154 | if (len + 1 > *buflen) |
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155 | return (-1); |
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156 | strcpy(*buf, tmp); |
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157 | *buf += len; |
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158 | *buflen -= len; |
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159 | return (0); |
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160 | } |
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161 | |
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162 | /*! \file */ |
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