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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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61 %Z time zone (EDT), or nothing if no time zone is determinable
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62
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63 Date fields:
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64 %a locale's abbreviated weekday name (Sun..Sat)
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65 %A locale's full weekday name, variable length (Sunday..Saturday)
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66 %b locale's abbreviated month name (Jan..Dec)
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67 %B locale's full month name, variable length (January..December)
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68 %c locale's date and time (Sat Nov 04 12:02:33 EST 1989)
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69 %C century (00..99)
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70 %d day of month (01..31)
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71 %e day of month ( 1..31)
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72 %D date (mm/dd/yy)
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73 %h same as %b
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74 %j day of year (001..366)
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75 %m month (01..12)
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76 %U week number of year with Sunday as first day of week (00..53)
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77 %w day of week (0..6)
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78 %W week number of year with Monday as first day of week (00..53)
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79 %x locale's date representation (mm/dd/yy)
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80 %y last two digits of year (00..99)
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81 %Y year (1970...)
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82
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83 David MacKenzie <djm@gnu.ai.mit.edu> */
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84
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85 #ifdef HAVE_CONFIG_H
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86 #include <config.h>
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87 #include "lisp.h"
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88 #endif
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89
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90 #include <stdio.h>
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91 #include <sys/types.h>
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92 #if defined(TM_IN_SYS_TIME) || (!defined(HAVE_TM_ZONE) && !defined(HAVE_TZNAME))
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93 #include <sys/time.h>
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94 #else
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95 #include <time.h>
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96 #endif
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97
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98 #ifndef STDC_HEADERS
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99 time_t mktime ();
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100 #endif
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101
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442
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102 #if defined(WIN32_NATIVE) || defined(CYGWIN)
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428
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103 #include <time.h>
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104 #else
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105 #if defined(HAVE_TZNAME)
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106 extern char *tzname[2];
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107 #endif
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442
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108 #endif /* WIN32_NATIVE */
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428
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109
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110 #ifdef emacs
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111 #define strftime emacs_strftime
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112 #endif
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113
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114 /* Types of padding for numbers in date and time. */
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115 enum padding
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116 {
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117 none, blank, zero
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118 };
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119
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442
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120 static char const* const days[] =
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428
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121 {
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122 "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"
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123 };
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124
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442
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125 static char const * const months[] =
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428
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126 {
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127 "January", "February", "March", "April", "May", "June",
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128 "July", "August", "September", "October", "November", "December"
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129 };
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130
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131 /* Add character C to STRING and increment LENGTH,
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132 unless LENGTH would exceed MAX. */
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133
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134 #define add_char(c) do \
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135 { \
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136 if (length + 1 <= max) \
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137 string[length++] = (c); \
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138 } while (0)
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139
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140 /* Add a 2 digit number to STRING, padding if specified.
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141 Return the number of characters added, up to MAX. */
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142
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143 static int
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144 add_num2 (char *string, int num, int max, enum padding pad)
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145 {
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146 int top = num / 10;
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147 int length = 0;
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148
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149 if (top == 0 && pad == blank)
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150 add_char (' ');
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151 else if (top != 0 || pad == zero)
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152 add_char (top + '0');
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153 add_char (num % 10 + '0');
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154 return length;
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155 }
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156
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157 /* Add a 3 digit number to STRING, padding if specified.
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158 Return the number of characters added, up to MAX. */
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159
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160 static int
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161 add_num3 (char *string, int num, int max, enum padding pad)
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162 {
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163 int top = num / 100;
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164 int mid = (num - top * 100) / 10;
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165 int length = 0;
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166
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167 if (top == 0 && pad == blank)
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168 add_char (' ');
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169 else if (top != 0 || pad == zero)
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170 add_char (top + '0');
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171 if (mid == 0 && top == 0 && pad == blank)
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172 add_char (' ');
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173 else if (mid != 0 || top != 0 || pad == zero)
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174 add_char (mid + '0');
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175 add_char (num % 10 + '0');
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176 return length;
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177 }
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178
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179 /* Like strncpy except return the number of characters copied. */
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180
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181 static int
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442
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182 add_str (char *to, const char *from, int max)
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428
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183 {
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184 int i;
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185
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186 for (i = 0; from[i] && i <= max; ++i)
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187 to[i] = from[i];
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188 return i;
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189 }
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190
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191 static int
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192 add_num_time_t (char *string, int max, time_t num)
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193 {
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194 /* This buffer is large enough to hold the character representation
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195 (including the trailing NUL) of any unsigned decimal quantity
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196 whose binary representation fits in 128 bits. */
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197 char buf[40];
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198
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199 if (sizeof (num) > 16)
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200 abort ();
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201 sprintf (buf, "%lu", (unsigned long) num);
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793
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202 return add_str (string, buf, max);
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428
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203 }
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204
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205 /* Return the week in the year of the time in TM, with the weeks
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206 starting on Sundays. */
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207
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208 static int
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442
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209 sun_week (const struct tm *tm)
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428
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210 {
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211 int dl;
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212
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213 /* Set `dl' to the day in the year of the last day of the week previous
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214 to the one containing the day specified in TM. If the day specified
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215 in TM is in the first week of the year, `dl' will be negative or 0.
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216 Otherwise, calculate the number of complete weeks before our week
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217 (dl / 7) and add any partial week at the start of the year (dl % 7). */
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218 dl = tm->tm_yday - tm->tm_wday;
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219 return dl <= 0 ? 0 : dl / 7 + (dl % 7 != 0);
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220 }
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221
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222 /* Return the week in the year of the time in TM, with the weeks
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223 starting on Mondays. */
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224
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225 static int
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442
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226 mon_week (const struct tm *tm)
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428
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227 {
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228 int dl, wday;
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229
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230 if (tm->tm_wday == 0)
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231 wday = 6;
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232 else
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233 wday = tm->tm_wday - 1;
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234 dl = tm->tm_yday - wday;
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235 return dl <= 0 ? 0 : dl / 7 + (dl % 7 != 0);
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236 }
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237
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238 #if !defined(HAVE_TM_ZONE) && !defined(HAVE_TZNAME)
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442
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239 char *zone_name (const struct tm *tp);
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428
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240 char *
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442
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241 zone_name (const struct tm *tp)
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428
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242 {
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243 char *timezone ();
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244 struct timeval tv;
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245 struct timezone tz;
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246
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247 gettimeofday (&tv, &tz);
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248 return timezone (tz.tz_minuteswest, tp->tm_isdst);
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249 }
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250 #endif
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251
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252 /* Format the time given in TM according to FORMAT, and put the
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253 results in STRING.
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254 Return the number of characters (not including terminating null)
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255 that were put into STRING, or 0 if the length would have
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256 exceeded MAX. */
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257
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442
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258 size_t strftime (char *string, size_t max, const char *format,
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259 const struct tm *tm);
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428
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260
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261 size_t
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442
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262 strftime (char *string, size_t max, const char *format, const struct tm *tm)
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428
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263 {
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264 enum padding pad; /* Type of padding to apply. */
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265 size_t length = 0; /* Characters put in STRING so far. */
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266
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267 for (; *format && length < max; ++format)
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268 {
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269 if (*format != '%')
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270 add_char (*format);
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271 else
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272 {
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273 ++format;
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274 /* Modifiers: */
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275 if (*format == '-')
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276 {
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277 pad = none;
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278 ++format;
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279 }
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280 else if (*format == '_')
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281 {
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282 pad = blank;
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283 ++format;
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284 }
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285 else
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286 pad = zero;
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287
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288 switch (*format)
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289 {
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290 /* Literal character fields: */
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291 case 0:
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292 case '%':
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293 add_char ('%');
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294 break;
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295 case 'n':
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296 add_char ('\n');
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297 break;
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298 case 't':
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299 add_char ('\t');
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300 break;
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301 default:
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302 add_char (*format);
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303 break;
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304
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305 /* Time fields: */
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306 case 'H':
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307 case 'k':
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308 length +=
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309 add_num2 (&string[length], tm->tm_hour, max - length,
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310 *format == 'H' ? pad : blank);
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311 break;
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312 case 'I':
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313 case 'l':
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314 {
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315 int hour12;
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316
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317 if (tm->tm_hour == 0)
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318 hour12 = 12;
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319 else if (tm->tm_hour > 12)
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320 hour12 = tm->tm_hour - 12;
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321 else
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322 hour12 = tm->tm_hour;
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323 length +=
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324 add_num2 (&string[length], hour12, max - length,
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325 *format == 'I' ? pad : blank);
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326 }
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327 break;
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328 case 'M':
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329 length +=
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330 add_num2 (&string[length], tm->tm_min, max - length, pad);
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331 break;
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332 case 'p':
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333 if (tm->tm_hour < 12)
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334 add_char ('A');
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335 else
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336 add_char ('P');
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337 add_char ('M');
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338 break;
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339 case 'r':
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340 length +=
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341 strftime (&string[length], max - length, "%I:%M:%S %p", tm);
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342 break;
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343 case 'R':
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344 length +=
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345 strftime (&string[length], max - length, "%H:%M", tm);
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346 break;
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347
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348 case 's':
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349 {
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350 struct tm writable_tm;
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351 writable_tm = *tm;
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352 length += add_num_time_t (&string[length], max - length,
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353 mktime (&writable_tm));
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354 }
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355 break;
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356
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357 case 'S':
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358 length +=
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359 add_num2 (&string[length], tm->tm_sec, max - length, pad);
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360 break;
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361 case 'T':
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362 length +=
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363 strftime (&string[length], max - length, "%H:%M:%S", tm);
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364 break;
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365 case 'X':
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366 length +=
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367 strftime (&string[length], max - length, "%H:%M:%S", tm);
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368 break;
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369 case 'Z':
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370 #ifdef HAVE_TM_ZONE
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371 length += add_str (&string[length], tm->tm_zone, max - length);
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372 #else
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373 #ifdef HAVE_TZNAME
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374 if (tm->tm_isdst && tzname[1] && *tzname[1])
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375 length += add_str (&string[length], tzname[1], max - length);
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376 else
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377 length += add_str (&string[length], tzname[0], max - length);
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378 #else
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379 length += add_str (&string[length], zone_name (tm), max - length);
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380 #endif
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381 #endif
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382 break;
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383
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384 /* Date fields: */
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385 case 'a':
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386 add_char (days[tm->tm_wday][0]);
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387 add_char (days[tm->tm_wday][1]);
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388 add_char (days[tm->tm_wday][2]);
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389 break;
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390 case 'A':
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391 length +=
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392 add_str (&string[length], days[tm->tm_wday], max - length);
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393 break;
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394 case 'b':
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395 case 'h':
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396 add_char (months[tm->tm_mon][0]);
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397 add_char (months[tm->tm_mon][1]);
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398 add_char (months[tm->tm_mon][2]);
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399 break;
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400 case 'B':
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401 length +=
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402 add_str (&string[length], months[tm->tm_mon], max - length);
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403 break;
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404 case 'c':
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405 length +=
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406 strftime (&string[length], max - length,
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407 "%a %b %d %H:%M:%S %Z %Y", tm);
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408 break;
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409 case 'C':
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410 length +=
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411 add_num2 (&string[length], (tm->tm_year + 1900) / 100,
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412 max - length, pad);
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413 break;
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414 case 'd':
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415 length +=
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416 add_num2 (&string[length], tm->tm_mday, max - length, pad);
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417 break;
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418 case 'e':
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419 length +=
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420 add_num2 (&string[length], tm->tm_mday, max - length, blank);
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421 break;
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422 case 'D':
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423 length +=
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424 strftime (&string[length], max - length, "%m/%d/%y", tm);
|
|
|
425 break;
|
|
|
426 case 'j':
|
|
|
427 length +=
|
|
|
428 add_num3 (&string[length], tm->tm_yday + 1, max - length, pad);
|
|
|
429 break;
|
|
|
430 case 'm':
|
|
|
431 length +=
|
|
|
432 add_num2 (&string[length], tm->tm_mon + 1, max - length, pad);
|
|
|
433 break;
|
|
|
434 case 'U':
|
|
|
435 length +=
|
|
|
436 add_num2 (&string[length], sun_week (tm), max - length, pad);
|
|
|
437 break;
|
|
|
438 case 'w':
|
|
|
439 add_char (tm->tm_wday + '0');
|
|
|
440 break;
|
|
|
441 case 'W':
|
|
|
442 length +=
|
|
|
443 add_num2 (&string[length], mon_week (tm), max - length, pad);
|
|
|
444 break;
|
|
|
445 case 'x':
|
|
|
446 length +=
|
|
|
447 strftime (&string[length], max - length, "%m/%d/%y", tm);
|
|
|
448 break;
|
|
|
449 case 'y':
|
|
|
450 length +=
|
|
|
451 add_num2 (&string[length], tm->tm_year % 100,
|
|
|
452 max - length, pad);
|
|
|
453 break;
|
|
|
454 case 'Y':
|
|
|
455 add_char ((tm->tm_year + 1900) / 1000 + '0');
|
|
|
456 length +=
|
|
|
457 add_num3 (&string[length],
|
|
|
458 (1900 + tm->tm_year) % 1000, max - length, zero);
|
|
|
459 break;
|
|
|
460 }
|
|
|
461 }
|
|
|
462 }
|
|
|
463 add_char (0);
|
|
|
464 return length - 1;
|
|
|
465 }
|
