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428
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1 /* strftime - custom formatting of date and/or time
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2 Copyright (C) 1989, 1991, 1992 Free Software Foundation, Inc.
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3
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4 This program is free software; you can redistribute it and/or modify
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5 it under the terms of the GNU General Public License as published by
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6 the Free Software Foundation; either version 2, or (at your option)
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7 any later version.
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8
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9 This program is distributed in the hope that it will be useful,
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 GNU General Public License for more details.
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13
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14 You should have received a copy of the GNU General Public License
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15 along with this program; see the file COPYING. If not, write to
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16 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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17 Boston, MA 02111-1307, USA. */
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18
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19 /* Synched up with: FSF 19.30. */
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20
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771
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21 /* This file has been ... uhhhhh ... Mule-ized. Yeah.
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22
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23 (Everything here is external format. This is DANGEROUS and
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24 data-lossy, but fixing it is too much of a bother now.) --ben */
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25
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428
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26 /* Note: this version of strftime lacks locale support,
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27 but it is standalone.
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28
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29 Performs `%' substitutions similar to those in printf. Except
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30 where noted, substituted fields have a fixed size; numeric fields are
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31 padded if necessary. Padding is with zeros by default; for fields
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32 that display a single number, padding can be changed or inhibited by
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33 following the `%' with one of the modifiers described below. Unknown
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34 field specifiers are copied as normal characters. All other
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35 characters are copied to the output without change.
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36
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37 Supports a superset of the ANSI C field specifiers.
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38
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39 Literal character fields:
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40 % %
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41 n newline
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42 t tab
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43
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44 Numeric modifiers (a nonstandard extension):
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45 - do not pad the field
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46 _ pad the field with spaces
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47
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48 Time fields:
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49 %H hour (00..23)
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50 %I hour (01..12)
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51 %k hour ( 0..23)
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52 %l hour ( 1..12)
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53 %M minute (00..59)
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54 %p locale's AM or PM
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55 %r time, 12-hour (hh:mm:ss [AP]M)
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56 %R time, 24-hour (hh:mm)
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57 %s time in seconds since 00:00:00, Jan 1, 1970 (a nonstandard extension)
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58 %S second (00..61)
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59 %T time, 24-hour (hh:mm:ss)
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60 %X locale's time representation (%H:%M:%S)
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4203
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61 %z time zone offset (e.g. +0530, -0800 etc)
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428
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62 %Z time zone (EDT), or nothing if no time zone is determinable
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63
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64 Date fields:
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65 %a locale's abbreviated weekday name (Sun..Sat)
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66 %A locale's full weekday name, variable length (Sunday..Saturday)
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67 %b locale's abbreviated month name (Jan..Dec)
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68 %B locale's full month name, variable length (January..December)
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69 %c locale's date and time (Sat Nov 04 12:02:33 EST 1989)
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70 %C century (00..99)
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71 %d day of month (01..31)
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72 %e day of month ( 1..31)
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73 %D date (mm/dd/yy)
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4203
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74 %G year corresponding to the ISO 8601 week
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75 %g Year of the ISO 8601 week within century (00 - 99)
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428
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76 %h same as %b
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77 %j day of year (001..366)
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78 %m month (01..12)
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79 %U week number of year with Sunday as first day of week (00..53)
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4203
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80 %V ISO 8601 week number (first week is the earliest one with Thu)
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428
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81 %w day of week (0..6)
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82 %W week number of year with Monday as first day of week (00..53)
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83 %x locale's date representation (mm/dd/yy)
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84 %y last two digits of year (00..99)
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85 %Y year (1970...)
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86
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87 David MacKenzie <djm@gnu.ai.mit.edu> */
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88
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89 #ifdef HAVE_CONFIG_H
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90 #include <config.h>
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91 #include "lisp.h"
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92 #endif
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93
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94 #include <stdio.h>
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95 #include <sys/types.h>
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96 #if defined(TM_IN_SYS_TIME) || (!defined(HAVE_TM_ZONE) && !defined(HAVE_TZNAME))
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97 #include <sys/time.h>
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98 #else
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99 #include <time.h>
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100 #endif
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101
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102 #ifndef STDC_HEADERS
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103 time_t mktime ();
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104 #endif
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105
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442
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106 #if defined(WIN32_NATIVE) || defined(CYGWIN)
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428
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107 #include <time.h>
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108 #else
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109 #if defined(HAVE_TZNAME)
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110 extern char *tzname[2];
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111 #endif
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442
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112 #endif /* WIN32_NATIVE */
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428
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113
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114 #ifdef emacs
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115 #define strftime emacs_strftime
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116 #endif
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117
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118 /* Types of padding for numbers in date and time. */
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119 enum padding
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120 {
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121 none, blank, zero
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122 };
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123
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442
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124 static char const* const days[] =
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428
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125 {
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126 "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"
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127 };
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128
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442
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129 static char const * const months[] =
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428
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130 {
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131 "January", "February", "March", "April", "May", "June",
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132 "July", "August", "September", "October", "November", "December"
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133 };
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134
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135 /* Add character C to STRING and increment LENGTH,
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136 unless LENGTH would exceed MAX. */
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137
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138 #define add_char(c) do \
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139 { \
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140 if (length + 1 <= max) \
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141 string[length++] = (c); \
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142 } while (0)
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143
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144 /* Add a 2 digit number to STRING, padding if specified.
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145 Return the number of characters added, up to MAX. */
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146
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147 static int
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148 add_num2 (char *string, int num, int max, enum padding pad)
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149 {
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150 int top = num / 10;
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151 int length = 0;
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152
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153 if (top == 0 && pad == blank)
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154 add_char (' ');
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155 else if (top != 0 || pad == zero)
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156 add_char (top + '0');
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157 add_char (num % 10 + '0');
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158 return length;
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159 }
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160
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161 /* Add a 3 digit number to STRING, padding if specified.
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162 Return the number of characters added, up to MAX. */
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163
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164 static int
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165 add_num3 (char *string, int num, int max, enum padding pad)
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166 {
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167 int top = num / 100;
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168 int mid = (num - top * 100) / 10;
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169 int length = 0;
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170
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171 if (top == 0 && pad == blank)
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172 add_char (' ');
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173 else if (top != 0 || pad == zero)
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174 add_char (top + '0');
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175 if (mid == 0 && top == 0 && pad == blank)
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176 add_char (' ');
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177 else if (mid != 0 || top != 0 || pad == zero)
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178 add_char (mid + '0');
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179 add_char (num % 10 + '0');
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180 return length;
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181 }
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182
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183 /* Like strncpy except return the number of characters copied. */
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184
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185 static int
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442
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186 add_str (char *to, const char *from, int max)
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428
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187 {
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188 int i;
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189
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190 for (i = 0; from[i] && i <= max; ++i)
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191 to[i] = from[i];
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192 return i;
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193 }
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194
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195 static int
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196 add_num_time_t (char *string, int max, time_t num)
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197 {
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198 /* This buffer is large enough to hold the character representation
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199 (including the trailing NUL) of any unsigned decimal quantity
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200 whose binary representation fits in 128 bits. */
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201 char buf[40];
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202
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203 if (sizeof (num) > 16)
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2500
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204 ABORT ();
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428
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205 sprintf (buf, "%lu", (unsigned long) num);
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793
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206 return add_str (string, buf, max);
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428
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207 }
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208
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209 /* Return the week in the year of the time in TM, with the weeks
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210 starting on Sundays. */
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211
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212 static int
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442
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213 sun_week (const struct tm *tm)
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428
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214 {
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215 int dl;
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216
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217 /* Set `dl' to the day in the year of the last day of the week previous
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218 to the one containing the day specified in TM. If the day specified
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219 in TM is in the first week of the year, `dl' will be negative or 0.
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220 Otherwise, calculate the number of complete weeks before our week
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221 (dl / 7) and add any partial week at the start of the year (dl % 7). */
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222 dl = tm->tm_yday - tm->tm_wday;
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223 return dl <= 0 ? 0 : dl / 7 + (dl % 7 != 0);
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224 }
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225
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226 /* Return the week in the year of the time in TM, with the weeks
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227 starting on Mondays. */
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228
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229 static int
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442
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230 mon_week (const struct tm *tm)
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428
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231 {
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232 int dl, wday;
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233
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234 if (tm->tm_wday == 0)
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235 wday = 6;
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236 else
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237 wday = tm->tm_wday - 1;
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238 dl = tm->tm_yday - wday;
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239 return dl <= 0 ? 0 : dl / 7 + (dl % 7 != 0);
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240 }
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241
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4203
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242 #ifndef __isleap
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243 /* Nonzero if YEAR is a leap year (every 4 years,
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244 except every 100th isn't, and every 400th is). */
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245 # define __isleap(year) \
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246 ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))
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247 #endif
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248
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249 /* The number of days from the first day of the first ISO week of this
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250 year to the year day YDAY with week day WDAY. ISO weeks start on
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251 Monday; the first ISO week has the year's first Thursday. YDAY may
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252 be as small as YDAY_MINIMUM. */
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253 #define ISO_WEEK_START_WDAY 1 /* Monday */
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254 #define ISO_WEEK1_WDAY 4 /* Thursday */
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255 #define YDAY_MINIMUM (-366)
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256 static int
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257 iso_week_days (int yday, int wday)
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258 {
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259 /* Add enough to the first operand of % to make it nonnegative. */
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260 int big_enough_multiple_of_7 = (-YDAY_MINIMUM / 7 + 2) * 7;
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261 return (yday
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262 - (yday - wday + ISO_WEEK1_WDAY + big_enough_multiple_of_7) % 7
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263 + ISO_WEEK1_WDAY - ISO_WEEK_START_WDAY);
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264 }
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265
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428
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266 #if !defined(HAVE_TM_ZONE) && !defined(HAVE_TZNAME)
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442
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267 char *zone_name (const struct tm *tp);
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428
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268 char *
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442
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269 zone_name (const struct tm *tp)
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428
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270 {
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271 char *timezone ();
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272 struct timeval tv;
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273 struct timezone tz;
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274
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275 gettimeofday (&tv, &tz);
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276 return timezone (tz.tz_minuteswest, tp->tm_isdst);
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277 }
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278 #endif
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279
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280 /* Format the time given in TM according to FORMAT, and put the
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281 results in STRING.
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282 Return the number of characters (not including terminating null)
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283 that were put into STRING, or 0 if the length would have
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284 exceeded MAX. */
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285
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442
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286 size_t strftime (char *string, size_t max, const char *format,
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287 const struct tm *tm);
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428
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288
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289 size_t
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442
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290 strftime (char *string, size_t max, const char *format, const struct tm *tm)
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428
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291 {
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292 enum padding pad; /* Type of padding to apply. */
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293 size_t length = 0; /* Characters put in STRING so far. */
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294
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295 for (; *format && length < max; ++format)
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296 {
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297 if (*format != '%')
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298 add_char (*format);
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299 else
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300 {
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301 ++format;
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302 /* Modifiers: */
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303 if (*format == '-')
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304 {
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305 pad = none;
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306 ++format;
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307 }
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308 else if (*format == '_')
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309 {
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310 pad = blank;
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311 ++format;
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312 }
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313 else
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314 pad = zero;
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315
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316 switch (*format)
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317 {
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318 /* Literal character fields: */
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319 case 0:
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320 case '%':
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321 add_char ('%');
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322 break;
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323 case 'n':
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324 add_char ('\n');
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325 break;
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326 case 't':
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327 add_char ('\t');
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328 break;
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329 default:
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330 add_char (*format);
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331 break;
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332
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333 /* Time fields: */
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334 case 'H':
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335 case 'k':
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336 length +=
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337 add_num2 (&string[length], tm->tm_hour, max - length,
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338 *format == 'H' ? pad : blank);
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339 break;
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340 case 'I':
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341 case 'l':
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342 {
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343 int hour12;
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344
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345 if (tm->tm_hour == 0)
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346 hour12 = 12;
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347 else if (tm->tm_hour > 12)
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348 hour12 = tm->tm_hour - 12;
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349 else
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350 hour12 = tm->tm_hour;
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351 length +=
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352 add_num2 (&string[length], hour12, max - length,
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353 *format == 'I' ? pad : blank);
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354 }
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355 break;
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356 case 'M':
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357 length +=
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358 add_num2 (&string[length], tm->tm_min, max - length, pad);
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359 break;
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360 case 'p':
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361 if (tm->tm_hour < 12)
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362 add_char ('A');
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363 else
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364 add_char ('P');
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365 add_char ('M');
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366 break;
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367 case 'r':
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368 length +=
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369 strftime (&string[length], max - length, "%I:%M:%S %p", tm);
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370 break;
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371 case 'R':
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372 length +=
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373 strftime (&string[length], max - length, "%H:%M", tm);
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374 break;
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375
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376 case 's':
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377 {
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378 struct tm writable_tm;
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379 writable_tm = *tm;
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380 length += add_num_time_t (&string[length], max - length,
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381 mktime (&writable_tm));
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382 }
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383 break;
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384
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385 case 'S':
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386 length +=
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387 add_num2 (&string[length], tm->tm_sec, max - length, pad);
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388 break;
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389 case 'T':
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390 length +=
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391 strftime (&string[length], max - length, "%H:%M:%S", tm);
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392 break;
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4203
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393
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394 case 'V':
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395 case 'g':
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396 case 'G':
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397 {
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398 int year = tm->tm_year + 1900;
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399 int days = iso_week_days (tm->tm_yday, tm->tm_wday);
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400
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401 if (days < 0)
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402 {
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403 /* This ISO week belongs to the previous year. */
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404 year--;
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405 days =
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406 iso_week_days (tm->tm_yday + (365 + __isleap (year)),
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407 tm->tm_wday);
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408 }
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409 else
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410 {
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411 int d =
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412 iso_week_days (tm->tm_yday - (365 + __isleap (year)),
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413 tm->tm_wday);
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414 if (0 <= d)
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415 {
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416 /* This ISO week belongs to the next year. */
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417 year++;
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418 days = d;
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|
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419 }
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|
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420 }
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|
421
|
|
|
422 switch (*format)
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423 {
|
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|
424 /*
|
|
|
425 #### FIXME
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|
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426 We really can't assume 1000 <= year <= 9999
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|
|
427 once time_t gets beyond 32 bits, but it's true
|
|
|
428 of the rest of the code here so get with the
|
|
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429 program
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|
|
430 */
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|
|
431 case 'g':
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|
|
432 length +=
|
|
|
433 add_num2 (&string[length], year % 100,
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|
|
434 max - length, pad);
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|
|
435 break;
|
|
|
436
|
|
|
437 case 'G':
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|
|
438 add_char (year / 1000 + '0');
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|
|
439 length += add_num3 (&string[length], year % 1000,
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|
|
440 max - length, zero);
|
|
|
441 break;
|
|
|
442
|
|
|
443 default:
|
|
|
444 length +=
|
|
|
445 add_num2 (&string[length], days / 7 + 1,
|
|
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446 max - length, pad);
|
|
|
447 break;
|
|
|
448 }
|
|
|
449 }
|
|
|
450 break;
|
|
428
|
451 case 'X':
|
|
|
452 length +=
|
|
|
453 strftime (&string[length], max - length, "%H:%M:%S", tm);
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|
|
454 break;
|
|
4203
|
455 case 'z':
|
|
|
456 {
|
|
|
457 /*
|
|
|
458 #### FIXME: could use tm->tm_gmtoff if present. Since
|
|
|
459 the other code in xemacs does not do so we follow the
|
|
|
460 leaders (and don't add a autoconf macro to detect
|
|
|
461 its presence).
|
|
|
462 */
|
|
|
463 long int offset;
|
|
|
464 long int minutes;
|
|
|
465 struct tm lt, *ut;
|
|
|
466 time_t utc;
|
|
|
467
|
|
|
468 lt = *tm;
|
|
|
469 utc = mktime(<);
|
|
|
470 ut = gmtime(&utc);
|
|
|
471 /* assume that tm is valid so the others will be too! */
|
|
|
472 assert( utc != (time_t) -1 && ut != NULL );
|
|
|
473
|
|
|
474 /* tm diff code below is based on mktime.c, glibc 2.3.2 */
|
|
|
475 {
|
|
|
476 int lt4, ut4, lt100, ut100, lt400, ut400;
|
|
|
477 int intervening_leap_days, years, days;
|
|
|
478
|
|
|
479 lt4 = (lt.tm_year >> 2) + (1900 >> 2) -
|
|
|
480 ! (lt.tm_year & 3);
|
|
|
481 ut4 = (ut->tm_year >> 2) + (1900 >> 2) -
|
|
|
482 ! (ut->tm_year & 3);
|
|
|
483 lt100 = lt4 / 25 - (lt4 % 25 < 0);
|
|
|
484 ut100 = ut4 / 25 - (ut4 % 25 < 0);
|
|
|
485 lt400 = lt100 >> 2;
|
|
|
486 ut400 = ut100 >> 2;
|
|
|
487 intervening_leap_days =
|
|
|
488 (lt4 - ut4) - (lt100 - ut100) + (lt400 - ut400);
|
|
|
489 years = lt.tm_year - ut->tm_year;
|
|
|
490 days = (365 * years + intervening_leap_days
|
|
|
491 + (lt.tm_yday - ut->tm_yday));
|
|
|
492 offset = (60 * (60 * (24 * days + (lt.tm_hour - ut->tm_hour))
|
|
|
493 + (lt.tm_min - ut->tm_min))
|
|
|
494 + (lt.tm_sec - ut->tm_sec));
|
|
|
495 }
|
|
|
496
|
|
|
497 minutes = offset / ( offset < 0 ? -60 : 60 );
|
|
|
498
|
|
|
499 add_char ((offset < 0 ? '-' : '+'));
|
|
|
500
|
|
|
501 if ( minutes / 600 != 0 )
|
|
|
502 add_char (minutes / 600 + '0');
|
|
|
503 else if ( pad != none )
|
|
|
504 add_char ((pad == zero ? '0' : ' '));
|
|
|
505
|
|
|
506 length +=
|
|
|
507 add_num3 (&string[length],
|
|
|
508 ((minutes / 60 ) % 10) * 100 + (minutes % 60),
|
|
|
509 max - length, pad);
|
|
|
510 break;
|
|
|
511 }
|
|
428
|
512 case 'Z':
|
|
|
513 #ifdef HAVE_TM_ZONE
|
|
|
514 length += add_str (&string[length], tm->tm_zone, max - length);
|
|
|
515 #else
|
|
|
516 #ifdef HAVE_TZNAME
|
|
|
517 if (tm->tm_isdst && tzname[1] && *tzname[1])
|
|
|
518 length += add_str (&string[length], tzname[1], max - length);
|
|
|
519 else
|
|
|
520 length += add_str (&string[length], tzname[0], max - length);
|
|
|
521 #else
|
|
|
522 length += add_str (&string[length], zone_name (tm), max - length);
|
|
|
523 #endif
|
|
|
524 #endif
|
|
|
525 break;
|
|
|
526
|
|
|
527 /* Date fields: */
|
|
|
528 case 'a':
|
|
|
529 add_char (days[tm->tm_wday][0]);
|
|
|
530 add_char (days[tm->tm_wday][1]);
|
|
|
531 add_char (days[tm->tm_wday][2]);
|
|
|
532 break;
|
|
|
533 case 'A':
|
|
|
534 length +=
|
|
|
535 add_str (&string[length], days[tm->tm_wday], max - length);
|
|
|
536 break;
|
|
|
537 case 'b':
|
|
|
538 case 'h':
|
|
|
539 add_char (months[tm->tm_mon][0]);
|
|
|
540 add_char (months[tm->tm_mon][1]);
|
|
|
541 add_char (months[tm->tm_mon][2]);
|
|
|
542 break;
|
|
|
543 case 'B':
|
|
|
544 length +=
|
|
|
545 add_str (&string[length], months[tm->tm_mon], max - length);
|
|
|
546 break;
|
|
|
547 case 'c':
|
|
|
548 length +=
|
|
|
549 strftime (&string[length], max - length,
|
|
|
550 "%a %b %d %H:%M:%S %Z %Y", tm);
|
|
|
551 break;
|
|
|
552 case 'C':
|
|
|
553 length +=
|
|
|
554 add_num2 (&string[length], (tm->tm_year + 1900) / 100,
|
|
|
555 max - length, pad);
|
|
|
556 break;
|
|
|
557 case 'd':
|
|
|
558 length +=
|
|
|
559 add_num2 (&string[length], tm->tm_mday, max - length, pad);
|
|
|
560 break;
|
|
|
561 case 'e':
|
|
|
562 length +=
|
|
|
563 add_num2 (&string[length], tm->tm_mday, max - length, blank);
|
|
|
564 break;
|
|
|
565 case 'D':
|
|
|
566 length +=
|
|
|
567 strftime (&string[length], max - length, "%m/%d/%y", tm);
|
|
|
568 break;
|
|
|
569 case 'j':
|
|
|
570 length +=
|
|
|
571 add_num3 (&string[length], tm->tm_yday + 1, max - length, pad);
|
|
|
572 break;
|
|
|
573 case 'm':
|
|
|
574 length +=
|
|
|
575 add_num2 (&string[length], tm->tm_mon + 1, max - length, pad);
|
|
|
576 break;
|
|
|
577 case 'U':
|
|
|
578 length +=
|
|
|
579 add_num2 (&string[length], sun_week (tm), max - length, pad);
|
|
|
580 break;
|
|
|
581 case 'w':
|
|
|
582 add_char (tm->tm_wday + '0');
|
|
|
583 break;
|
|
|
584 case 'W':
|
|
|
585 length +=
|
|
|
586 add_num2 (&string[length], mon_week (tm), max - length, pad);
|
|
|
587 break;
|
|
|
588 case 'x':
|
|
|
589 length +=
|
|
|
590 strftime (&string[length], max - length, "%m/%d/%y", tm);
|
|
|
591 break;
|
|
|
592 case 'y':
|
|
|
593 length +=
|
|
|
594 add_num2 (&string[length], tm->tm_year % 100,
|
|
|
595 max - length, pad);
|
|
|
596 break;
|
|
|
597 case 'Y':
|
|
|
598 add_char ((tm->tm_year + 1900) / 1000 + '0');
|
|
|
599 length +=
|
|
|
600 add_num3 (&string[length],
|
|
|
601 (1900 + tm->tm_year) % 1000, max - length, zero);
|
|
|
602 break;
|
|
|
603 }
|
|
|
604 }
|
|
|
605 }
|
|
|
606 add_char (0);
|
|
|
607 return length - 1;
|
|
|
608 }
|
