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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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21 /* Note: this version of strftime lacks locale support,
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22 but it is standalone.
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23
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24 Performs `%' substitutions similar to those in printf. Except
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25 where noted, substituted fields have a fixed size; numeric fields are
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26 padded if necessary. Padding is with zeros by default; for fields
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27 that display a single number, padding can be changed or inhibited by
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28 following the `%' with one of the modifiers described below. Unknown
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29 field specifiers are copied as normal characters. All other
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30 characters are copied to the output without change.
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31
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32 Supports a superset of the ANSI C field specifiers.
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33
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34 Literal character fields:
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35 % %
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36 n newline
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37 t tab
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38
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39 Numeric modifiers (a nonstandard extension):
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40 - do not pad the field
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41 _ pad the field with spaces
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42
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43 Time fields:
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44 %H hour (00..23)
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45 %I hour (01..12)
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46 %k hour ( 0..23)
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47 %l hour ( 1..12)
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48 %M minute (00..59)
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49 %p locale's AM or PM
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50 %r time, 12-hour (hh:mm:ss [AP]M)
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51 %R time, 24-hour (hh:mm)
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52 %s time in seconds since 00:00:00, Jan 1, 1970 (a nonstandard extension)
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53 %S second (00..61)
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54 %T time, 24-hour (hh:mm:ss)
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55 %X locale's time representation (%H:%M:%S)
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56 %Z time zone (EDT), or nothing if no time zone is determinable
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57
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58 Date fields:
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59 %a locale's abbreviated weekday name (Sun..Sat)
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60 %A locale's full weekday name, variable length (Sunday..Saturday)
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61 %b locale's abbreviated month name (Jan..Dec)
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62 %B locale's full month name, variable length (January..December)
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63 %c locale's date and time (Sat Nov 04 12:02:33 EST 1989)
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64 %C century (00..99)
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65 %d day of month (01..31)
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66 %e day of month ( 1..31)
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67 %D date (mm/dd/yy)
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68 %h same as %b
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69 %j day of year (001..366)
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70 %m month (01..12)
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71 %U week number of year with Sunday as first day of week (00..53)
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72 %w day of week (0..6)
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73 %W week number of year with Monday as first day of week (00..53)
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74 %x locale's date representation (mm/dd/yy)
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75 %y last two digits of year (00..99)
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76 %Y year (1970...)
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77
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78 David MacKenzie <djm@gnu.ai.mit.edu> */
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79
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80 #ifdef HAVE_CONFIG_H
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81 #include <config.h>
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82 #include "lisp.h"
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83 #endif
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84
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85 #include <stdio.h>
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86 #include <sys/types.h>
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87 #if defined(TM_IN_SYS_TIME) || (!defined(HAVE_TM_ZONE) && !defined(HAVE_TZNAME))
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88 #include <sys/time.h>
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89 #else
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90 #include <time.h>
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91 #endif
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92
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93 #ifndef STDC_HEADERS
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94 time_t mktime ();
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95 #endif
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96
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97 #if defined(WINDOWSNT) || defined(__CYGWIN32__)
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98 #include <time.h>
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99 #else
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100 #if defined(HAVE_TZNAME)
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101 extern char *tzname[2];
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102 #endif
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103 #endif /* WINDOWSNT */
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104
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105 #ifdef emacs
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106 #define strftime emacs_strftime
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107 #endif
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108
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109 /* Types of padding for numbers in date and time. */
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110 enum padding
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111 {
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112 none, blank, zero
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113 };
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114
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115 static char CONST* CONST days[] =
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116 {
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117 "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"
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118 };
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119
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120 static char CONST * CONST months[] =
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121 {
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122 "January", "February", "March", "April", "May", "June",
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123 "July", "August", "September", "October", "November", "December"
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124 };
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125
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126 /* Add character C to STRING and increment LENGTH,
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127 unless LENGTH would exceed MAX. */
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128
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129 #define add_char(c) do \
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130 { \
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131 if (length + 1 <= max) \
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132 string[length++] = (c); \
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133 } while (0)
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134
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135 /* Add a 2 digit number to STRING, padding if specified.
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136 Return the number of characters added, up to MAX. */
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137
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138 static int
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139 add_num2 (char *string, int num, int max, enum padding pad)
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140 {
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141 int top = num / 10;
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142 int length = 0;
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143
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144 if (top == 0 && pad == blank)
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145 add_char (' ');
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146 else if (top != 0 || pad == zero)
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147 add_char (top + '0');
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148 add_char (num % 10 + '0');
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149 return length;
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150 }
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151
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152 /* Add a 3 digit number to STRING, padding if specified.
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153 Return the number of characters added, up to MAX. */
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154
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155 static int
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156 add_num3 (char *string, int num, int max, enum padding pad)
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157 {
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158 int top = num / 100;
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159 int mid = (num - top * 100) / 10;
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160 int length = 0;
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161
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162 if (top == 0 && pad == blank)
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163 add_char (' ');
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164 else if (top != 0 || pad == zero)
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165 add_char (top + '0');
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166 if (mid == 0 && top == 0 && pad == blank)
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167 add_char (' ');
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168 else if (mid != 0 || top != 0 || pad == zero)
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169 add_char (mid + '0');
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170 add_char (num % 10 + '0');
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171 return length;
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172 }
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173
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174 /* Like strncpy except return the number of characters copied. */
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175
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176 static int
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177 add_str (char *to, CONST char *from, int max)
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178 {
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179 int i;
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180
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181 for (i = 0; from[i] && i <= max; ++i)
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182 to[i] = from[i];
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183 return i;
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184 }
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185
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186 static int
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187 add_num_time_t (char *string, int max, time_t num)
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188 {
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189 /* This buffer is large enough to hold the character representation
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190 (including the trailing NUL) of any unsigned decimal quantity
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191 whose binary representation fits in 128 bits. */
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192 char buf[40];
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193 int length;
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194
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195 if (sizeof (num) > 16)
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196 abort ();
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197 sprintf (buf, "%lu", (unsigned long) num);
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198 length = add_str (string, buf, max);
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199 return length;
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200 }
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201
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202 /* Return the week in the year of the time in TM, with the weeks
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203 starting on Sundays. */
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204
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205 static int
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206 sun_week (CONST struct tm *tm)
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207 {
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208 int dl;
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209
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210 /* Set `dl' to the day in the year of the last day of the week previous
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211 to the one containing the day specified in TM. If the day specified
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212 in TM is in the first week of the year, `dl' will be negative or 0.
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213 Otherwise, calculate the number of complete weeks before our week
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214 (dl / 7) and add any partial week at the start of the year (dl % 7). */
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215 dl = tm->tm_yday - tm->tm_wday;
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216 return dl <= 0 ? 0 : dl / 7 + (dl % 7 != 0);
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217 }
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218
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219 /* Return the week in the year of the time in TM, with the weeks
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220 starting on Mondays. */
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221
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222 static int
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223 mon_week (CONST struct tm *tm)
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224 {
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225 int dl, wday;
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226
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227 if (tm->tm_wday == 0)
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228 wday = 6;
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229 else
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230 wday = tm->tm_wday - 1;
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231 dl = tm->tm_yday - wday;
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232 return dl <= 0 ? 0 : dl / 7 + (dl % 7 != 0);
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233 }
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234
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235 #if !defined(HAVE_TM_ZONE) && !defined(HAVE_TZNAME)
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236 char *
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237 zone_name (CONST struct tm *tp)
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238 {
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239 char *timezone ();
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240 struct timeval tv;
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241 struct timezone tz;
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242
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243 gettimeofday (&tv, &tz);
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244 return timezone (tz.tz_minuteswest, tp->tm_isdst);
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245 }
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246 #endif
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247
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248 /* Format the time given in TM according to FORMAT, and put the
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249 results in STRING.
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250 Return the number of characters (not including terminating null)
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251 that were put into STRING, or 0 if the length would have
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252 exceeded MAX. */
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253
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254 size_t strftime (char *string, size_t max, CONST char *format,
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255 CONST struct tm *tm);
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256
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257 size_t
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258 strftime (char *string, size_t max, CONST char *format, CONST struct tm *tm)
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259 {
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260 enum padding pad; /* Type of padding to apply. */
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261 size_t length = 0; /* Characters put in STRING so far. */
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262
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263 for (; *format && length < max; ++format)
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264 {
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265 if (*format != '%')
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266 add_char (*format);
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267 else
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268 {
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269 ++format;
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270 /* Modifiers: */
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271 if (*format == '-')
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272 {
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273 pad = none;
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274 ++format;
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275 }
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276 else if (*format == '_')
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277 {
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278 pad = blank;
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279 ++format;
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280 }
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281 else
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282 pad = zero;
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283
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284 switch (*format)
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285 {
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286 /* Literal character fields: */
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287 case 0:
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288 case '%':
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289 add_char ('%');
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290 break;
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291 case 'n':
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292 add_char ('\n');
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293 break;
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294 case 't':
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295 add_char ('\t');
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296 break;
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297 default:
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298 add_char (*format);
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299 break;
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300
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301 /* Time fields: */
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302 case 'H':
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303 case 'k':
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304 length +=
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305 add_num2 (&string[length], tm->tm_hour, max - length,
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306 *format == 'H' ? pad : blank);
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307 break;
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308 case 'I':
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309 case 'l':
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310 {
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311 int hour12;
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312
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313 if (tm->tm_hour == 0)
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314 hour12 = 12;
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315 else if (tm->tm_hour > 12)
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316 hour12 = tm->tm_hour - 12;
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317 else
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318 hour12 = tm->tm_hour;
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319 length +=
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320 add_num2 (&string[length], hour12, max - length,
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321 *format == 'I' ? pad : blank);
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322 }
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323 break;
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324 case 'M':
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325 length +=
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326 add_num2 (&string[length], tm->tm_min, max - length, pad);
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327 break;
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328 case 'p':
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329 if (tm->tm_hour < 12)
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330 add_char ('A');
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331 else
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332 add_char ('P');
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333 add_char ('M');
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334 break;
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335 case 'r':
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336 length +=
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337 strftime (&string[length], max - length, "%I:%M:%S %p", tm);
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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, "%H:%M", tm);
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342 break;
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343
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344 case 's':
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345 {
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346 struct tm writable_tm;
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347 writable_tm = *tm;
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348 length += add_num_time_t (&string[length], max - length,
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349 mktime (&writable_tm));
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350 }
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351 break;
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352
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353 case 'S':
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354 length +=
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355 add_num2 (&string[length], tm->tm_sec, max - length, pad);
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356 break;
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357 case 'T':
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358 length +=
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359 strftime (&string[length], max - length, "%H:%M:%S", tm);
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360 break;
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361 case 'X':
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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 'Z':
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366 #ifdef HAVE_TM_ZONE
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367 length += add_str (&string[length], tm->tm_zone, max - length);
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368 #else
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369 #ifdef HAVE_TZNAME
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370 if (tm->tm_isdst && tzname[1] && *tzname[1])
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371 length += add_str (&string[length], tzname[1], max - length);
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372 else
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373 length += add_str (&string[length], tzname[0], max - length);
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374 #else
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375 length += add_str (&string[length], zone_name (tm), max - length);
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376 #endif
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377 #endif
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378 break;
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379
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380 /* Date fields: */
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381 case 'a':
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382 add_char (days[tm->tm_wday][0]);
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383 add_char (days[tm->tm_wday][1]);
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384 add_char (days[tm->tm_wday][2]);
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385 break;
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386 case 'A':
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387 length +=
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388 add_str (&string[length], days[tm->tm_wday], max - length);
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389 break;
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390 case 'b':
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391 case 'h':
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392 add_char (months[tm->tm_mon][0]);
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393 add_char (months[tm->tm_mon][1]);
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394 add_char (months[tm->tm_mon][2]);
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395 break;
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396 case 'B':
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397 length +=
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398 add_str (&string[length], months[tm->tm_mon], max - length);
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399 break;
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400 case 'c':
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401 length +=
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402 strftime (&string[length], max - length,
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403 "%a %b %d %H:%M:%S %Z %Y", tm);
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404 break;
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405 case 'C':
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406 length +=
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407 add_num2 (&string[length], (tm->tm_year + 1900) / 100,
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408 max - length, pad);
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409 break;
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410 case 'd':
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411 length +=
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412 add_num2 (&string[length], tm->tm_mday, max - length, pad);
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413 break;
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414 case 'e':
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415 length +=
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416 add_num2 (&string[length], tm->tm_mday, max - length, blank);
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417 break;
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418 case 'D':
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419 length +=
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420 strftime (&string[length], max - length, "%m/%d/%y", tm);
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421 break;
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422 case 'j':
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423 length +=
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424 add_num3 (&string[length], tm->tm_yday + 1, max - length, pad);
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425 break;
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426 case 'm':
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427 length +=
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428 add_num2 (&string[length], tm->tm_mon + 1, max - length, pad);
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|
|
429 break;
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|
|
430 case 'U':
|
|
|
431 length +=
|
|
|
432 add_num2 (&string[length], sun_week (tm), max - length, pad);
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|
|
433 break;
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|
|
434 case 'w':
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|
|
435 add_char (tm->tm_wday + '0');
|
|
|
436 break;
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|
|
437 case 'W':
|
|
|
438 length +=
|
|
|
439 add_num2 (&string[length], mon_week (tm), max - length, pad);
|
|
|
440 break;
|
|
|
441 case 'x':
|
|
|
442 length +=
|
|
|
443 strftime (&string[length], max - length, "%m/%d/%y", tm);
|
|
|
444 break;
|
|
|
445 case 'y':
|
|
|
446 length +=
|
|
|
447 add_num2 (&string[length], tm->tm_year % 100,
|
|
|
448 max - length, pad);
|
|
|
449 break;
|
|
|
450 case 'Y':
|
|
|
451 add_char ((tm->tm_year + 1900) / 1000 + '0');
|
|
|
452 length +=
|
|
|
453 add_num3 (&string[length],
|
|
|
454 (1900 + tm->tm_year) % 1000, max - length, zero);
|
|
|
455 break;
|
|
|
456 }
|
|
|
457 }
|
|
|
458 }
|
|
|
459 add_char (0);
|
|
|
460 return length - 1;
|
|
|
461 }
|
