Mercurial > hg > octave-kai > gnulib-hg
annotate lib/getdate.y @ 1761:14b8e8de40c8
(get_date): Reuse tm_isdst of first localtime
call; this is an improvement on a bug fix suggested by
martin@dresden.nacamar.de. Do not assume that localtime and
gmtime return non-null.
From Paul Eggert.
| author | Jim Meyering <jim@meyering.net> |
|---|---|
| date | Sun, 28 Mar 1999 20:58:51 +0000 |
| parents | 4b9de8310f84 |
| children | 372368af7f4e |
| rev | line source |
|---|---|
| 9 | 1 %{ |
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2 /* |
| 9 | 3 ** Originally written by Steven M. Bellovin <smb@research.att.com> while |
| 4 ** at the University of North Carolina at Chapel Hill. Later tweaked by | |
| 5 ** a couple of people on Usenet. Completely overhauled by Rich $alz | |
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6 ** <rsalz@bbn.com> and Jim Berets <jberets@bbn.com> in August, 1990. |
| 9 | 7 ** |
| 8 ** This code is in the public domain and has no copyright. | |
| 9 */ | |
| 10 | |
| 48 | 11 #ifdef HAVE_CONFIG_H |
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12 # include <config.h> |
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13 # ifdef HAVE_ALLOCA_H |
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14 # include <alloca.h> |
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15 # endif |
| 101 | 16 #endif |
| 48 | 17 |
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18 /* Since the code of getdate.y is not included in the Emacs executable |
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19 itself, there is no need to #define static in this file. Even if |
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20 the code were included in the Emacs executable, it probably |
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21 wouldn't do any harm to #undef it here; this will only cause |
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22 problems if we try to write to a static variable, which I don't |
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23 think this code needs to do. */ |
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24 #ifdef emacs |
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25 # undef static |
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26 #endif |
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27 |
| 9 | 28 #include <stdio.h> |
| 29 #include <ctype.h> | |
| 30 | |
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31 #if defined (STDC_HEADERS) || (!defined (isascii) && !defined (HAVE_ISASCII)) |
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32 # define IN_CTYPE_DOMAIN(c) 1 |
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33 #else |
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34 # define IN_CTYPE_DOMAIN(c) isascii(c) |
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35 #endif |
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36 |
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37 #define ISSPACE(c) (IN_CTYPE_DOMAIN (c) && isspace (c)) |
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38 #define ISALPHA(c) (IN_CTYPE_DOMAIN (c) && isalpha (c)) |
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39 #define ISUPPER(c) (IN_CTYPE_DOMAIN (c) && isupper (c)) |
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40 #define ISDIGIT_LOCALE(c) (IN_CTYPE_DOMAIN (c) && isdigit (c)) |
| 814 | 41 |
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42 /* ISDIGIT differs from ISDIGIT_LOCALE, as follows: |
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43 - Its arg may be any int or unsigned int; it need not be an unsigned char. |
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44 - It's guaranteed to evaluate its argument exactly once. |
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45 - It's typically faster. |
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46 Posix 1003.2-1992 section 2.5.2.1 page 50 lines 1556-1558 says that |
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47 only '0' through '9' are digits. Prefer ISDIGIT to ISDIGIT_LOCALE unless |
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48 it's important to use the locale's definition of `digit' even when the |
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49 host does not conform to Posix. */ |
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50 #define ISDIGIT(c) ((unsigned) (c) - '0' <= 9) |
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51 |
| 9 | 52 #if defined (STDC_HEADERS) || defined (USG) |
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53 # include <string.h> |
| 9 | 54 #endif |
| 55 | |
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56 #if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 7) |
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57 # define __attribute__(x) |
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58 #endif |
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59 |
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60 #ifndef ATTRIBUTE_UNUSED |
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61 # define ATTRIBUTE_UNUSED __attribute__ ((__unused__)) |
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62 #endif |
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63 |
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64 /* Some old versions of bison generate parsers that use bcopy. |
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65 That loses on systems that don't provide the function, so we have |
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66 to redefine it here. */ |
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67 #if !defined (HAVE_BCOPY) && defined (HAVE_MEMCPY) && !defined (bcopy) |
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68 # define bcopy(from, to, len) memcpy ((to), (from), (len)) |
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69 #endif |
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70 |
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71 /* Remap normal yacc parser interface names (yyparse, yylex, yyerror, etc), |
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72 as well as gratuitiously global symbol names, so we can have multiple |
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73 yacc generated parsers in the same program. Note that these are only |
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74 the variables produced by yacc. If other parser generators (bison, |
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75 byacc, etc) produce additional global names that conflict at link time, |
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76 then those parser generators need to be fixed instead of adding those |
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77 names to this list. */ |
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78 |
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79 #define yymaxdepth gd_maxdepth |
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80 #define yyparse gd_parse |
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81 #define yylex gd_lex |
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82 #define yyerror gd_error |
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83 #define yylval gd_lval |
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84 #define yychar gd_char |
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85 #define yydebug gd_debug |
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86 #define yypact gd_pact |
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87 #define yyr1 gd_r1 |
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88 #define yyr2 gd_r2 |
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89 #define yydef gd_def |
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90 #define yychk gd_chk |
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91 #define yypgo gd_pgo |
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92 #define yyact gd_act |
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93 #define yyexca gd_exca |
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94 #define yyerrflag gd_errflag |
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95 #define yynerrs gd_nerrs |
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96 #define yyps gd_ps |
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97 #define yypv gd_pv |
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98 #define yys gd_s |
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99 #define yy_yys gd_yys |
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100 #define yystate gd_state |
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101 #define yytmp gd_tmp |
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102 #define yyv gd_v |
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103 #define yy_yyv gd_yyv |
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104 #define yyval gd_val |
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105 #define yylloc gd_lloc |
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106 #define yyreds gd_reds /* With YYDEBUG defined */ |
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107 #define yytoks gd_toks /* With YYDEBUG defined */ |
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108 #define yylhs gd_yylhs |
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109 #define yylen gd_yylen |
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110 #define yydefred gd_yydefred |
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111 #define yydgoto gd_yydgoto |
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112 #define yysindex gd_yysindex |
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113 #define yyrindex gd_yyrindex |
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114 #define yygindex gd_yygindex |
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115 #define yytable gd_yytable |
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116 #define yycheck gd_yycheck |
| 9 | 117 |
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118 static int yylex (); |
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119 static int yyerror (); |
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120 |
| 9 | 121 #define EPOCH 1970 |
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122 #define HOUR(x) ((x) * 60) |
| 9 | 123 |
| 303 | 124 #define MAX_BUFF_LEN 128 /* size of buffer to read the date into */ |
| 9 | 125 |
| 126 /* | |
| 127 ** An entry in the lexical lookup table. | |
| 128 */ | |
| 129 typedef struct _TABLE { | |
| 304 | 130 const char *name; |
| 9 | 131 int type; |
|
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132 int value; |
| 9 | 133 } TABLE; |
| 134 | |
| 135 | |
| 136 /* | |
| 137 ** Meridian: am, pm, or 24-hour style. | |
| 138 */ | |
| 139 typedef enum _MERIDIAN { | |
| 140 MERam, MERpm, MER24 | |
| 141 } MERIDIAN; | |
| 142 | |
| 143 | |
| 144 /* | |
| 145 ** Global variables. We could get rid of most of these by using a good | |
| 146 ** union as the yacc stack. (This routine was originally written before | |
| 147 ** yacc had the %union construct.) Maybe someday; right now we only use | |
| 148 ** the %union very rarely. | |
| 149 */ | |
|
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150 static const char *yyInput; |
|
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151 static int yyDayOrdinal; |
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152 static int yyDayNumber; |
| 9 | 153 static int yyHaveDate; |
| 154 static int yyHaveDay; | |
| 155 static int yyHaveRel; | |
| 156 static int yyHaveTime; | |
| 157 static int yyHaveZone; | |
|
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158 static int yyTimezone; |
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159 static int yyDay; |
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160 static int yyHour; |
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161 static int yyMinutes; |
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162 static int yyMonth; |
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163 static int yySeconds; |
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164 static int yyYear; |
| 9 | 165 static MERIDIAN yyMeridian; |
|
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166 static int yyRelDay; |
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167 static int yyRelHour; |
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168 static int yyRelMinutes; |
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169 static int yyRelMonth; |
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170 static int yyRelSeconds; |
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171 static int yyRelYear; |
| 9 | 172 |
| 173 %} | |
| 174 | |
| 1203 | 175 /* This grammar has 13 shift/reduce conflicts. */ |
| 176 %expect 13 | |
| 177 | |
| 9 | 178 %union { |
|
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179 int Number; |
| 9 | 180 enum _MERIDIAN Meridian; |
| 181 } | |
| 182 | |
|
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183 %token tAGO tDAY tDAY_UNIT tDAYZONE tDST tHOUR_UNIT tID |
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184 %token tMERIDIAN tMINUTE_UNIT tMONTH tMONTH_UNIT |
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185 %token tSEC_UNIT tSNUMBER tUNUMBER tYEAR_UNIT tZONE |
| 9 | 186 |
|
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187 %type <Number> tDAY tDAY_UNIT tDAYZONE tHOUR_UNIT tMINUTE_UNIT |
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188 %type <Number> tMONTH tMONTH_UNIT |
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189 %type <Number> tSEC_UNIT tSNUMBER tUNUMBER tYEAR_UNIT tZONE |
| 9 | 190 %type <Meridian> tMERIDIAN o_merid |
| 191 | |
| 192 %% | |
| 193 | |
| 194 spec : /* NULL */ | |
| 195 | spec item | |
| 196 ; | |
| 197 | |
| 198 item : time { | |
| 199 yyHaveTime++; | |
| 200 } | |
| 201 | zone { | |
| 202 yyHaveZone++; | |
| 203 } | |
| 204 | date { | |
| 205 yyHaveDate++; | |
| 206 } | |
| 207 | day { | |
| 208 yyHaveDay++; | |
| 209 } | |
| 210 | rel { | |
| 211 yyHaveRel++; | |
| 212 } | |
| 213 | number | |
| 214 ; | |
| 215 | |
| 216 time : tUNUMBER tMERIDIAN { | |
| 217 yyHour = $1; | |
| 218 yyMinutes = 0; | |
| 219 yySeconds = 0; | |
| 220 yyMeridian = $2; | |
| 221 } | |
| 222 | tUNUMBER ':' tUNUMBER o_merid { | |
| 223 yyHour = $1; | |
| 224 yyMinutes = $3; | |
| 225 yySeconds = 0; | |
| 226 yyMeridian = $4; | |
| 227 } | |
| 228 | tUNUMBER ':' tUNUMBER tSNUMBER { | |
| 229 yyHour = $1; | |
| 230 yyMinutes = $3; | |
| 231 yyMeridian = MER24; | |
|
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232 yyHaveZone++; |
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233 yyTimezone = ($4 < 0 |
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234 ? -$4 % 100 + (-$4 / 100) * 60 |
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235 : - ($4 % 100 + ($4 / 100) * 60)); |
| 9 | 236 } |
| 237 | tUNUMBER ':' tUNUMBER ':' tUNUMBER o_merid { | |
| 238 yyHour = $1; | |
| 239 yyMinutes = $3; | |
| 240 yySeconds = $5; | |
| 241 yyMeridian = $6; | |
| 242 } | |
| 243 | tUNUMBER ':' tUNUMBER ':' tUNUMBER tSNUMBER { | |
| 244 yyHour = $1; | |
| 245 yyMinutes = $3; | |
| 246 yySeconds = $5; | |
| 247 yyMeridian = MER24; | |
|
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248 yyHaveZone++; |
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249 yyTimezone = ($6 < 0 |
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250 ? -$6 % 100 + (-$6 / 100) * 60 |
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251 : - ($6 % 100 + ($6 / 100) * 60)); |
| 9 | 252 } |
| 253 ; | |
| 254 | |
| 255 zone : tZONE { | |
| 256 yyTimezone = $1; | |
| 257 } | |
| 258 | tDAYZONE { | |
|
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259 yyTimezone = $1 - 60; |
| 9 | 260 } |
| 261 | | |
| 262 tZONE tDST { | |
|
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263 yyTimezone = $1 - 60; |
| 9 | 264 } |
| 265 ; | |
| 266 | |
| 267 day : tDAY { | |
| 268 yyDayOrdinal = 1; | |
| 269 yyDayNumber = $1; | |
| 270 } | |
| 271 | tDAY ',' { | |
| 272 yyDayOrdinal = 1; | |
| 273 yyDayNumber = $1; | |
| 274 } | |
| 562 | 275 | tUNUMBER tDAY { |
| 9 | 276 yyDayOrdinal = $1; |
| 277 yyDayNumber = $2; | |
| 278 } | |
| 279 ; | |
| 280 | |
| 281 date : tUNUMBER '/' tUNUMBER { | |
| 282 yyMonth = $1; | |
| 283 yyDay = $3; | |
| 284 } | |
| 285 | tUNUMBER '/' tUNUMBER '/' tUNUMBER { | |
|
795
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286 /* Interpret as YYYY/MM/DD if $1 >= 1000, otherwise as MM/DD/YY. |
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287 The goal in recognizing YYYY/MM/DD is solely to support legacy |
|
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288 machine-generated dates like those in an RCS log listing. If |
|
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289 you want portability, use the ISO 8601 format. */ |
|
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290 if ($1 >= 1000) |
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291 { |
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292 yyYear = $1; |
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293 yyMonth = $3; |
|
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294 yyDay = $5; |
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295 } |
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296 else |
|
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297 { |
|
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298 yyMonth = $1; |
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299 yyDay = $3; |
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300 yyYear = $5; |
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301 } |
| 9 | 302 } |
| 303 | tUNUMBER tSNUMBER tSNUMBER { | |
| 304 /* ISO 8601 format. yyyy-mm-dd. */ | |
| 305 yyYear = $1; | |
| 306 yyMonth = -$2; | |
| 307 yyDay = -$3; | |
| 308 } | |
| 176 | 309 | tUNUMBER tMONTH tSNUMBER { |
| 310 /* e.g. 17-JUN-1992. */ | |
| 311 yyDay = $1; | |
| 312 yyMonth = $2; | |
| 313 yyYear = -$3; | |
| 314 } | |
| 9 | 315 | tMONTH tUNUMBER { |
| 316 yyMonth = $1; | |
| 317 yyDay = $2; | |
| 318 } | |
| 319 | tMONTH tUNUMBER ',' tUNUMBER { | |
| 320 yyMonth = $1; | |
| 321 yyDay = $2; | |
| 322 yyYear = $4; | |
| 323 } | |
| 324 | tUNUMBER tMONTH { | |
| 325 yyMonth = $2; | |
| 326 yyDay = $1; | |
| 327 } | |
| 328 | tUNUMBER tMONTH tUNUMBER { | |
| 329 yyMonth = $2; | |
| 330 yyDay = $1; | |
| 331 yyYear = $3; | |
| 332 } | |
| 333 ; | |
| 334 | |
| 335 rel : relunit tAGO { | |
| 336 yyRelSeconds = -yyRelSeconds; | |
|
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337 yyRelMinutes = -yyRelMinutes; |
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338 yyRelHour = -yyRelHour; |
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339 yyRelDay = -yyRelDay; |
| 9 | 340 yyRelMonth = -yyRelMonth; |
|
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341 yyRelYear = -yyRelYear; |
| 9 | 342 } |
| 343 | relunit | |
| 344 ; | |
| 345 | |
|
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346 relunit : tUNUMBER tYEAR_UNIT { |
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347 yyRelYear += $1 * $2; |
| 9 | 348 } |
|
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349 | tSNUMBER tYEAR_UNIT { |
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350 yyRelYear += $1 * $2; |
| 9 | 351 } |
|
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352 | tYEAR_UNIT { |
|
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353 yyRelYear += $1; |
| 9 | 354 } |
|
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355 | tUNUMBER tMONTH_UNIT { |
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356 yyRelMonth += $1 * $2; |
| 9 | 357 } |
| 562 | 358 | tSNUMBER tMONTH_UNIT { |
| 9 | 359 yyRelMonth += $1 * $2; |
| 360 } | |
|
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361 | tMONTH_UNIT { |
|
887
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362 yyRelMonth += $1; |
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363 } |
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364 | tUNUMBER tDAY_UNIT { |
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365 yyRelDay += $1 * $2; |
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366 } |
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367 | tSNUMBER tDAY_UNIT { |
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368 yyRelDay += $1 * $2; |
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369 } |
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370 | tDAY_UNIT { |
|
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371 yyRelDay += $1; |
|
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372 } |
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373 | tUNUMBER tHOUR_UNIT { |
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374 yyRelHour += $1 * $2; |
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375 } |
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376 | tSNUMBER tHOUR_UNIT { |
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377 yyRelHour += $1 * $2; |
| 9 | 378 } |
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379 | tHOUR_UNIT { |
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380 yyRelHour += $1; |
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381 } |
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382 | tUNUMBER tMINUTE_UNIT { |
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383 yyRelMinutes += $1 * $2; |
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384 } |
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385 | tSNUMBER tMINUTE_UNIT { |
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386 yyRelMinutes += $1 * $2; |
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387 } |
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388 | tMINUTE_UNIT { |
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389 yyRelMinutes += $1; |
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390 } |
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391 | tUNUMBER tSEC_UNIT { |
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392 yyRelSeconds += $1 * $2; |
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393 } |
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394 | tSNUMBER tSEC_UNIT { |
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395 yyRelSeconds += $1 * $2; |
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396 } |
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397 | tSEC_UNIT { |
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398 yyRelSeconds += $1; |
| 9 | 399 } |
| 400 ; | |
| 401 | |
| 857 | 402 number : tUNUMBER |
| 403 { | |
| 9 | 404 if (yyHaveTime && yyHaveDate && !yyHaveRel) |
| 857 | 405 yyYear = $1; |
| 406 else | |
| 407 { | |
| 408 if ($1>10000) | |
| 409 { | |
| 9 | 410 yyHaveDate++; |
| 177 | 411 yyDay= ($1)%100; |
| 412 yyMonth= ($1/100)%100; | |
| 413 yyYear = $1/10000; | |
| 857 | 414 } |
| 415 else | |
| 416 { | |
| 177 | 417 yyHaveTime++; |
| 857 | 418 if ($1 < 100) |
| 419 { | |
| 177 | 420 yyHour = $1; |
| 421 yyMinutes = 0; | |
| 857 | 422 } |
| 423 else | |
| 424 { | |
| 177 | 425 yyHour = $1 / 100; |
| 426 yyMinutes = $1 % 100; | |
| 857 | 427 } |
| 177 | 428 yySeconds = 0; |
| 429 yyMeridian = MER24; | |
| 857 | 430 } |
| 431 } | |
| 432 } | |
| 9 | 433 ; |
| 434 | |
| 857 | 435 o_merid : /* NULL */ |
| 436 { | |
| 9 | 437 $$ = MER24; |
| 857 | 438 } |
| 439 | tMERIDIAN | |
| 440 { | |
| 9 | 441 $$ = $1; |
| 857 | 442 } |
| 9 | 443 ; |
| 444 | |
| 445 %% | |
| 446 | |
| 1203 | 447 /* Include this file down here because bison inserts code above which |
| 448 may define-away `const'. We want the prototype for get_date to have | |
| 449 the same signature as the function definition does. */ | |
| 1265 | 450 #include "getdate.h" |
| 1203 | 451 |
| 452 extern struct tm *gmtime (); | |
| 453 extern struct tm *localtime (); | |
| 454 extern time_t mktime (); | |
| 455 | |
| 9 | 456 /* Month and day table. */ |
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457 static TABLE const MonthDayTable[] = { |
| 9 | 458 { "january", tMONTH, 1 }, |
| 459 { "february", tMONTH, 2 }, | |
| 460 { "march", tMONTH, 3 }, | |
| 461 { "april", tMONTH, 4 }, | |
| 462 { "may", tMONTH, 5 }, | |
| 463 { "june", tMONTH, 6 }, | |
| 464 { "july", tMONTH, 7 }, | |
| 465 { "august", tMONTH, 8 }, | |
| 466 { "september", tMONTH, 9 }, | |
| 467 { "sept", tMONTH, 9 }, | |
| 468 { "october", tMONTH, 10 }, | |
| 469 { "november", tMONTH, 11 }, | |
| 470 { "december", tMONTH, 12 }, | |
| 471 { "sunday", tDAY, 0 }, | |
| 472 { "monday", tDAY, 1 }, | |
| 473 { "tuesday", tDAY, 2 }, | |
| 474 { "tues", tDAY, 2 }, | |
| 475 { "wednesday", tDAY, 3 }, | |
| 476 { "wednes", tDAY, 3 }, | |
| 477 { "thursday", tDAY, 4 }, | |
| 478 { "thur", tDAY, 4 }, | |
| 479 { "thurs", tDAY, 4 }, | |
| 480 { "friday", tDAY, 5 }, | |
| 481 { "saturday", tDAY, 6 }, | |
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482 { NULL, 0, 0 } |
| 9 | 483 }; |
| 484 | |
| 485 /* Time units table. */ | |
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486 static TABLE const UnitsTable[] = { |
|
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487 { "year", tYEAR_UNIT, 1 }, |
| 9 | 488 { "month", tMONTH_UNIT, 1 }, |
|
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489 { "fortnight", tDAY_UNIT, 14 }, |
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490 { "week", tDAY_UNIT, 7 }, |
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491 { "day", tDAY_UNIT, 1 }, |
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492 { "hour", tHOUR_UNIT, 1 }, |
| 9 | 493 { "minute", tMINUTE_UNIT, 1 }, |
| 494 { "min", tMINUTE_UNIT, 1 }, | |
| 495 { "second", tSEC_UNIT, 1 }, | |
| 496 { "sec", tSEC_UNIT, 1 }, | |
|
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497 { NULL, 0, 0 } |
| 9 | 498 }; |
| 499 | |
| 500 /* Assorted relative-time words. */ | |
|
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501 static TABLE const OtherTable[] = { |
| 9 | 502 { "tomorrow", tMINUTE_UNIT, 1 * 24 * 60 }, |
| 503 { "yesterday", tMINUTE_UNIT, -1 * 24 * 60 }, | |
| 504 { "today", tMINUTE_UNIT, 0 }, | |
| 505 { "now", tMINUTE_UNIT, 0 }, | |
| 506 { "last", tUNUMBER, -1 }, | |
| 507 { "this", tMINUTE_UNIT, 0 }, | |
|
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508 { "next", tUNUMBER, 1 }, |
| 9 | 509 { "first", tUNUMBER, 1 }, |
| 510 /* { "second", tUNUMBER, 2 }, */ | |
| 511 { "third", tUNUMBER, 3 }, | |
| 512 { "fourth", tUNUMBER, 4 }, | |
| 513 { "fifth", tUNUMBER, 5 }, | |
| 514 { "sixth", tUNUMBER, 6 }, | |
| 515 { "seventh", tUNUMBER, 7 }, | |
| 516 { "eighth", tUNUMBER, 8 }, | |
| 517 { "ninth", tUNUMBER, 9 }, | |
| 518 { "tenth", tUNUMBER, 10 }, | |
| 519 { "eleventh", tUNUMBER, 11 }, | |
| 520 { "twelfth", tUNUMBER, 12 }, | |
| 521 { "ago", tAGO, 1 }, | |
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522 { NULL, 0, 0 } |
| 9 | 523 }; |
| 524 | |
| 525 /* The timezone table. */ | |
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526 static TABLE const TimezoneTable[] = { |
| 303 | 527 { "gmt", tZONE, HOUR ( 0) }, /* Greenwich Mean */ |
| 528 { "ut", tZONE, HOUR ( 0) }, /* Universal (Coordinated) */ | |
| 529 { "utc", tZONE, HOUR ( 0) }, | |
| 530 { "wet", tZONE, HOUR ( 0) }, /* Western European */ | |
| 531 { "bst", tDAYZONE, HOUR ( 0) }, /* British Summer */ | |
| 532 { "wat", tZONE, HOUR ( 1) }, /* West Africa */ | |
| 533 { "at", tZONE, HOUR ( 2) }, /* Azores */ | |
| 9 | 534 #if 0 |
| 535 /* For completeness. BST is also British Summer, and GST is | |
| 536 * also Guam Standard. */ | |
| 303 | 537 { "bst", tZONE, HOUR ( 3) }, /* Brazil Standard */ |
| 538 { "gst", tZONE, HOUR ( 3) }, /* Greenland Standard */ | |
| 9 | 539 #endif |
| 540 #if 0 | |
| 303 | 541 { "nft", tZONE, HOUR (3.5) }, /* Newfoundland */ |
| 542 { "nst", tZONE, HOUR (3.5) }, /* Newfoundland Standard */ | |
| 543 { "ndt", tDAYZONE, HOUR (3.5) }, /* Newfoundland Daylight */ | |
| 9 | 544 #endif |
| 303 | 545 { "ast", tZONE, HOUR ( 4) }, /* Atlantic Standard */ |
| 546 { "adt", tDAYZONE, HOUR ( 4) }, /* Atlantic Daylight */ | |
| 547 { "est", tZONE, HOUR ( 5) }, /* Eastern Standard */ | |
| 548 { "edt", tDAYZONE, HOUR ( 5) }, /* Eastern Daylight */ | |
| 549 { "cst", tZONE, HOUR ( 6) }, /* Central Standard */ | |
| 550 { "cdt", tDAYZONE, HOUR ( 6) }, /* Central Daylight */ | |
| 551 { "mst", tZONE, HOUR ( 7) }, /* Mountain Standard */ | |
| 552 { "mdt", tDAYZONE, HOUR ( 7) }, /* Mountain Daylight */ | |
| 553 { "pst", tZONE, HOUR ( 8) }, /* Pacific Standard */ | |
| 554 { "pdt", tDAYZONE, HOUR ( 8) }, /* Pacific Daylight */ | |
| 555 { "yst", tZONE, HOUR ( 9) }, /* Yukon Standard */ | |
| 556 { "ydt", tDAYZONE, HOUR ( 9) }, /* Yukon Daylight */ | |
| 557 { "hst", tZONE, HOUR (10) }, /* Hawaii Standard */ | |
| 558 { "hdt", tDAYZONE, HOUR (10) }, /* Hawaii Daylight */ | |
| 559 { "cat", tZONE, HOUR (10) }, /* Central Alaska */ | |
| 560 { "ahst", tZONE, HOUR (10) }, /* Alaska-Hawaii Standard */ | |
| 561 { "nt", tZONE, HOUR (11) }, /* Nome */ | |
| 562 { "idlw", tZONE, HOUR (12) }, /* International Date Line West */ | |
| 563 { "cet", tZONE, -HOUR (1) }, /* Central European */ | |
| 564 { "met", tZONE, -HOUR (1) }, /* Middle European */ | |
| 565 { "mewt", tZONE, -HOUR (1) }, /* Middle European Winter */ | |
| 566 { "mest", tDAYZONE, -HOUR (1) }, /* Middle European Summer */ | |
| 567 { "mesz", tDAYZONE, -HOUR (1) }, /* Middle European Summer */ | |
| 568 { "swt", tZONE, -HOUR (1) }, /* Swedish Winter */ | |
| 569 { "sst", tDAYZONE, -HOUR (1) }, /* Swedish Summer */ | |
| 570 { "fwt", tZONE, -HOUR (1) }, /* French Winter */ | |
| 571 { "fst", tDAYZONE, -HOUR (1) }, /* French Summer */ | |
| 572 { "eet", tZONE, -HOUR (2) }, /* Eastern Europe, USSR Zone 1 */ | |
| 573 { "bt", tZONE, -HOUR (3) }, /* Baghdad, USSR Zone 2 */ | |
| 9 | 574 #if 0 |
| 303 | 575 { "it", tZONE, -HOUR (3.5) },/* Iran */ |
| 9 | 576 #endif |
| 303 | 577 { "zp4", tZONE, -HOUR (4) }, /* USSR Zone 3 */ |
| 578 { "zp5", tZONE, -HOUR (5) }, /* USSR Zone 4 */ | |
| 9 | 579 #if 0 |
| 303 | 580 { "ist", tZONE, -HOUR (5.5) },/* Indian Standard */ |
| 9 | 581 #endif |
| 303 | 582 { "zp6", tZONE, -HOUR (6) }, /* USSR Zone 5 */ |
| 9 | 583 #if 0 |
| 299 | 584 /* For completeness. NST is also Newfoundland Standard, and SST is |
| 9 | 585 * also Swedish Summer. */ |
| 303 | 586 { "nst", tZONE, -HOUR (6.5) },/* North Sumatra */ |
| 587 { "sst", tZONE, -HOUR (7) }, /* South Sumatra, USSR Zone 6 */ | |
| 9 | 588 #endif /* 0 */ |
| 303 | 589 { "wast", tZONE, -HOUR (7) }, /* West Australian Standard */ |
| 590 { "wadt", tDAYZONE, -HOUR (7) }, /* West Australian Daylight */ | |
| 9 | 591 #if 0 |
| 303 | 592 { "jt", tZONE, -HOUR (7.5) },/* Java (3pm in Cronusland!) */ |
| 9 | 593 #endif |
| 303 | 594 { "cct", tZONE, -HOUR (8) }, /* China Coast, USSR Zone 7 */ |
| 595 { "jst", tZONE, -HOUR (9) }, /* Japan Standard, USSR Zone 8 */ | |
| 9 | 596 #if 0 |
| 303 | 597 { "cast", tZONE, -HOUR (9.5) },/* Central Australian Standard */ |
| 598 { "cadt", tDAYZONE, -HOUR (9.5) },/* Central Australian Daylight */ | |
| 9 | 599 #endif |
| 303 | 600 { "east", tZONE, -HOUR (10) }, /* Eastern Australian Standard */ |
| 601 { "eadt", tDAYZONE, -HOUR (10) }, /* Eastern Australian Daylight */ | |
| 602 { "gst", tZONE, -HOUR (10) }, /* Guam Standard, USSR Zone 9 */ | |
| 603 { "nzt", tZONE, -HOUR (12) }, /* New Zealand */ | |
| 604 { "nzst", tZONE, -HOUR (12) }, /* New Zealand Standard */ | |
| 605 { "nzdt", tDAYZONE, -HOUR (12) }, /* New Zealand Daylight */ | |
| 606 { "idle", tZONE, -HOUR (12) }, /* International Date Line East */ | |
|
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607 { NULL, 0, 0 } |
| 9 | 608 }; |
| 609 | |
| 610 /* Military timezone table. */ | |
|
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611 static TABLE const MilitaryTable[] = { |
| 303 | 612 { "a", tZONE, HOUR ( 1) }, |
| 613 { "b", tZONE, HOUR ( 2) }, | |
| 614 { "c", tZONE, HOUR ( 3) }, | |
| 615 { "d", tZONE, HOUR ( 4) }, | |
| 616 { "e", tZONE, HOUR ( 5) }, | |
| 617 { "f", tZONE, HOUR ( 6) }, | |
| 618 { "g", tZONE, HOUR ( 7) }, | |
| 619 { "h", tZONE, HOUR ( 8) }, | |
| 620 { "i", tZONE, HOUR ( 9) }, | |
| 621 { "k", tZONE, HOUR ( 10) }, | |
| 622 { "l", tZONE, HOUR ( 11) }, | |
| 623 { "m", tZONE, HOUR ( 12) }, | |
| 624 { "n", tZONE, HOUR (- 1) }, | |
| 625 { "o", tZONE, HOUR (- 2) }, | |
| 626 { "p", tZONE, HOUR (- 3) }, | |
| 627 { "q", tZONE, HOUR (- 4) }, | |
| 628 { "r", tZONE, HOUR (- 5) }, | |
| 629 { "s", tZONE, HOUR (- 6) }, | |
| 630 { "t", tZONE, HOUR (- 7) }, | |
| 631 { "u", tZONE, HOUR (- 8) }, | |
| 632 { "v", tZONE, HOUR (- 9) }, | |
| 633 { "w", tZONE, HOUR (-10) }, | |
| 634 { "x", tZONE, HOUR (-11) }, | |
| 635 { "y", tZONE, HOUR (-12) }, | |
| 636 { "z", tZONE, HOUR ( 0) }, | |
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637 { NULL, 0, 0 } |
| 9 | 638 }; |
| 639 | |
| 640 | |
| 641 | |
| 642 | |
| 643 /* ARGSUSED */ | |
|
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644 static int |
| 303 | 645 yyerror (s) |
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646 char *s ATTRIBUTE_UNUSED; |
| 9 | 647 { |
| 648 return 0; | |
| 649 } | |
| 650 | |
|
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651 static int |
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652 ToHour (Hours, Meridian) |
| 857 | 653 int Hours; |
| 654 MERIDIAN Meridian; | |
| 9 | 655 { |
| 857 | 656 switch (Meridian) |
| 657 { | |
| 658 case MER24: | |
| 659 if (Hours < 0 || Hours > 23) | |
| 660 return -1; | |
| 661 return Hours; | |
| 662 case MERam: | |
| 663 if (Hours < 1 || Hours > 12) | |
| 664 return -1; | |
| 665 if (Hours == 12) | |
| 666 Hours = 0; | |
| 667 return Hours; | |
| 668 case MERpm: | |
| 669 if (Hours < 1 || Hours > 12) | |
| 670 return -1; | |
| 671 if (Hours == 12) | |
| 672 Hours = 0; | |
| 673 return Hours + 12; | |
| 674 default: | |
| 675 abort (); | |
| 676 } | |
| 303 | 677 /* NOTREACHED */ |
| 9 | 678 } |
| 679 | |
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680 static int |
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681 ToYear (Year) |
| 857 | 682 int Year; |
| 9 | 683 { |
| 303 | 684 if (Year < 0) |
| 685 Year = -Year; | |
|
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686 |
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687 /* XPG4 suggests that years 00-68 map to 2000-2068, and |
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688 years 69-99 map to 1969-1999. */ |
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689 if (Year < 69) |
| 562 | 690 Year += 2000; |
| 691 else if (Year < 100) | |
| 303 | 692 Year += 1900; |
| 9 | 693 |
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1997-01-06 Paul Eggert <eggert@twinsun.com>
Jim Meyering <jim@meyering.net>
parents:
814
diff
changeset
|
694 return Year; |
| 9 | 695 } |
| 696 | |
| 697 static int | |
| 303 | 698 LookupWord (buff) |
| 857 | 699 char *buff; |
| 9 | 700 { |
| 857 | 701 register char *p; |
| 702 register char *q; | |
| 703 register const TABLE *tp; | |
| 704 int i; | |
| 705 int abbrev; | |
| 9 | 706 |
| 303 | 707 /* Make it lowercase. */ |
| 708 for (p = buff; *p; p++) | |
|
688
cc4dbb9f5f58
Define and use upper case variants of ctype.h IS* macros.
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parents:
562
diff
changeset
|
709 if (ISUPPER (*p)) |
| 303 | 710 *p = tolower (*p); |
| 9 | 711 |
| 857 | 712 if (strcmp (buff, "am") == 0 || strcmp (buff, "a.m.") == 0) |
| 713 { | |
| 714 yylval.Meridian = MERam; | |
| 715 return tMERIDIAN; | |
| 716 } | |
| 717 if (strcmp (buff, "pm") == 0 || strcmp (buff, "p.m.") == 0) | |
| 718 { | |
| 719 yylval.Meridian = MERpm; | |
| 720 return tMERIDIAN; | |
| 721 } | |
| 9 | 722 |
| 303 | 723 /* See if we have an abbreviation for a month. */ |
| 724 if (strlen (buff) == 3) | |
| 725 abbrev = 1; | |
| 857 | 726 else if (strlen (buff) == 4 && buff[3] == '.') |
| 727 { | |
| 728 abbrev = 1; | |
| 729 buff[3] = '\0'; | |
| 730 } | |
| 303 | 731 else |
| 732 abbrev = 0; | |
| 9 | 733 |
| 857 | 734 for (tp = MonthDayTable; tp->name; tp++) |
| 735 { | |
| 736 if (abbrev) | |
| 737 { | |
| 738 if (strncmp (buff, tp->name, 3) == 0) | |
| 739 { | |
| 740 yylval.Number = tp->value; | |
| 741 return tp->type; | |
| 742 } | |
| 743 } | |
| 744 else if (strcmp (buff, tp->name) == 0) | |
| 745 { | |
| 746 yylval.Number = tp->value; | |
| 747 return tp->type; | |
| 748 } | |
| 749 } | |
| 750 | |
| 751 for (tp = TimezoneTable; tp->name; tp++) | |
| 752 if (strcmp (buff, tp->name) == 0) | |
| 753 { | |
| 303 | 754 yylval.Number = tp->value; |
| 755 return tp->type; | |
| 756 } | |
| 9 | 757 |
|
561
4b31356e49f4
(RelativeMonth): Add 1900 to the year so that relative date specs
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parents:
476
diff
changeset
|
758 if (strcmp (buff, "dst") == 0) |
| 303 | 759 return tDST; |
| 9 | 760 |
| 303 | 761 for (tp = UnitsTable; tp->name; tp++) |
| 857 | 762 if (strcmp (buff, tp->name) == 0) |
| 763 { | |
| 303 | 764 yylval.Number = tp->value; |
| 765 return tp->type; | |
| 766 } | |
| 857 | 767 |
| 768 /* Strip off any plural and try the units table again. */ | |
| 769 i = strlen (buff) - 1; | |
| 770 if (buff[i] == 's') | |
| 771 { | |
| 772 buff[i] = '\0'; | |
| 773 for (tp = UnitsTable; tp->name; tp++) | |
| 774 if (strcmp (buff, tp->name) == 0) | |
| 775 { | |
| 776 yylval.Number = tp->value; | |
| 777 return tp->type; | |
| 778 } | |
| 779 buff[i] = 's'; /* Put back for "this" in OtherTable. */ | |
| 780 } | |
| 9 | 781 |
| 303 | 782 for (tp = OtherTable; tp->name; tp++) |
| 857 | 783 if (strcmp (buff, tp->name) == 0) |
| 784 { | |
| 303 | 785 yylval.Number = tp->value; |
| 786 return tp->type; | |
| 787 } | |
| 857 | 788 |
| 789 /* Military timezones. */ | |
| 790 if (buff[1] == '\0' && ISALPHA (*buff)) | |
| 791 { | |
| 792 for (tp = MilitaryTable; tp->name; tp++) | |
| 793 if (strcmp (buff, tp->name) == 0) | |
| 794 { | |
| 795 yylval.Number = tp->value; | |
| 796 return tp->type; | |
| 797 } | |
| 798 } | |
| 9 | 799 |
| 303 | 800 /* Drop out any periods and try the timezone table again. */ |
| 801 for (i = 0, p = q = buff; *q; q++) | |
| 802 if (*q != '.') | |
| 803 *p++ = *q; | |
| 804 else | |
| 805 i++; | |
| 806 *p = '\0'; | |
| 807 if (i) | |
| 808 for (tp = TimezoneTable; tp->name; tp++) | |
| 857 | 809 if (strcmp (buff, tp->name) == 0) |
| 810 { | |
| 811 yylval.Number = tp->value; | |
| 812 return tp->type; | |
| 813 } | |
| 303 | 814 |
| 815 return tID; | |
| 9 | 816 } |
| 817 | |
|
16
01c6d40adf9d
Make tables static and const when possible.
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parents:
9
diff
changeset
|
818 static int |
| 303 | 819 yylex () |
| 9 | 820 { |
| 857 | 821 register char c; |
| 822 register char *p; | |
| 823 char buff[20]; | |
| 824 int Count; | |
| 825 int sign; | |
| 9 | 826 |
| 857 | 827 for (;;) |
| 828 { | |
| 829 while (ISSPACE (*yyInput)) | |
| 830 yyInput++; | |
| 9 | 831 |
| 857 | 832 if (ISDIGIT (c = *yyInput) || c == '-' || c == '+') |
| 833 { | |
| 834 if (c == '-' || c == '+') | |
| 835 { | |
| 836 sign = c == '-' ? -1 : 1; | |
| 837 if (!ISDIGIT (*++yyInput)) | |
| 838 /* skip the '-' sign */ | |
| 839 continue; | |
| 840 } | |
| 841 else | |
| 842 sign = 0; | |
| 843 for (yylval.Number = 0; ISDIGIT (c = *yyInput++);) | |
| 844 yylval.Number = 10 * yylval.Number + c - '0'; | |
| 845 yyInput--; | |
| 846 if (sign < 0) | |
| 847 yylval.Number = -yylval.Number; | |
| 848 return sign ? tSNUMBER : tUNUMBER; | |
| 849 } | |
| 850 if (ISALPHA (c)) | |
| 851 { | |
| 852 for (p = buff; (c = *yyInput++, ISALPHA (c)) || c == '.';) | |
| 853 if (p < &buff[sizeof buff - 1]) | |
| 854 *p++ = c; | |
| 855 *p = '\0'; | |
| 856 yyInput--; | |
| 857 return LookupWord (buff); | |
| 858 } | |
| 859 if (c != '(') | |
| 860 return *yyInput++; | |
| 861 Count = 0; | |
| 862 do | |
| 863 { | |
| 864 c = *yyInput++; | |
| 865 if (c == '\0') | |
| 866 return c; | |
| 867 if (c == '(') | |
| 868 Count++; | |
| 869 else if (c == ')') | |
| 870 Count--; | |
| 871 } | |
| 872 while (Count > 0); | |
| 9 | 873 } |
| 874 } | |
| 875 | |
|
207
25a5ae7fce09
Revert 1.14-1.16 changes that removed difftm and modified get_date.
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parents:
202
diff
changeset
|
876 #define TM_YEAR_ORIGIN 1900 |
|
25a5ae7fce09
Revert 1.14-1.16 changes that removed difftm and modified get_date.
Jim Meyering <jim@meyering.net>
parents:
202
diff
changeset
|
877 |
|
25a5ae7fce09
Revert 1.14-1.16 changes that removed difftm and modified get_date.
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parents:
202
diff
changeset
|
878 /* Yield A - B, measured in seconds. */ |
|
25a5ae7fce09
Revert 1.14-1.16 changes that removed difftm and modified get_date.
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parents:
202
diff
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|
879 static long |
|
25a5ae7fce09
Revert 1.14-1.16 changes that removed difftm and modified get_date.
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parents:
202
diff
changeset
|
880 difftm (a, b) |
|
25a5ae7fce09
Revert 1.14-1.16 changes that removed difftm and modified get_date.
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parents:
202
diff
changeset
|
881 struct tm *a, *b; |
|
25a5ae7fce09
Revert 1.14-1.16 changes that removed difftm and modified get_date.
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parents:
202
diff
changeset
|
882 { |
|
25a5ae7fce09
Revert 1.14-1.16 changes that removed difftm and modified get_date.
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parents:
202
diff
changeset
|
883 int ay = a->tm_year + (TM_YEAR_ORIGIN - 1); |
|
25a5ae7fce09
Revert 1.14-1.16 changes that removed difftm and modified get_date.
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parents:
202
diff
changeset
|
884 int by = b->tm_year + (TM_YEAR_ORIGIN - 1); |
| 302 | 885 long days = ( |
| 857 | 886 /* difference in day of year */ |
| 887 a->tm_yday - b->tm_yday | |
| 888 /* + intervening leap days */ | |
| 889 + ((ay >> 2) - (by >> 2)) | |
| 890 - (ay / 100 - by / 100) | |
| 891 + ((ay / 100 >> 2) - (by / 100 >> 2)) | |
| 892 /* + difference in years * 365 */ | |
| 893 + (long) (ay - by) * 365 | |
| 894 ); | |
| 895 return (60 * (60 * (24 * days + (a->tm_hour - b->tm_hour)) | |
| 896 + (a->tm_min - b->tm_min)) | |
|
207
25a5ae7fce09
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parents:
202
diff
changeset
|
897 + (a->tm_sec - b->tm_sec)); |
|
25a5ae7fce09
Revert 1.14-1.16 changes that removed difftm and modified get_date.
Jim Meyering <jim@meyering.net>
parents:
202
diff
changeset
|
898 } |
|
25a5ae7fce09
Revert 1.14-1.16 changes that removed difftm and modified get_date.
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parents:
202
diff
changeset
|
899 |
| 9 | 900 time_t |
| 1203 | 901 get_date (const char *p, const time_t *now) |
| 9 | 902 { |
|
855
9c89b90524b8
(get_date): Change prototype to reflect const'ness of parameters.
Jim Meyering <jim@meyering.net>
parents:
852
diff
changeset
|
903 struct tm tm, tm0, *tmp; |
|
9c89b90524b8
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Jim Meyering <jim@meyering.net>
parents:
852
diff
changeset
|
904 time_t Start; |
| 9 | 905 |
| 303 | 906 yyInput = p; |
|
852
2156a43352c1
1997-01-06 Paul Eggert <eggert@twinsun.com>
Jim Meyering <jim@meyering.net>
parents:
814
diff
changeset
|
907 Start = now ? *now : time ((time_t *) NULL); |
|
2156a43352c1
1997-01-06 Paul Eggert <eggert@twinsun.com>
Jim Meyering <jim@meyering.net>
parents:
814
diff
changeset
|
908 tmp = localtime (&Start); |
|
1761
14b8e8de40c8
(get_date): Reuse tm_isdst of first localtime
Jim Meyering <jim@meyering.net>
parents:
1717
diff
changeset
|
909 if (!tmp) |
|
14b8e8de40c8
(get_date): Reuse tm_isdst of first localtime
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parents:
1717
diff
changeset
|
910 return -1; |
|
852
2156a43352c1
1997-01-06 Paul Eggert <eggert@twinsun.com>
Jim Meyering <jim@meyering.net>
parents:
814
diff
changeset
|
911 yyYear = tmp->tm_year + TM_YEAR_ORIGIN; |
|
2156a43352c1
1997-01-06 Paul Eggert <eggert@twinsun.com>
Jim Meyering <jim@meyering.net>
parents:
814
diff
changeset
|
912 yyMonth = tmp->tm_mon + 1; |
|
2156a43352c1
1997-01-06 Paul Eggert <eggert@twinsun.com>
Jim Meyering <jim@meyering.net>
parents:
814
diff
changeset
|
913 yyDay = tmp->tm_mday; |
|
2156a43352c1
1997-01-06 Paul Eggert <eggert@twinsun.com>
Jim Meyering <jim@meyering.net>
parents:
814
diff
changeset
|
914 yyHour = tmp->tm_hour; |
|
2156a43352c1
1997-01-06 Paul Eggert <eggert@twinsun.com>
Jim Meyering <jim@meyering.net>
parents:
814
diff
changeset
|
915 yyMinutes = tmp->tm_min; |
|
2156a43352c1
1997-01-06 Paul Eggert <eggert@twinsun.com>
Jim Meyering <jim@meyering.net>
parents:
814
diff
changeset
|
916 yySeconds = tmp->tm_sec; |
|
1761
14b8e8de40c8
(get_date): Reuse tm_isdst of first localtime
Jim Meyering <jim@meyering.net>
parents:
1717
diff
changeset
|
917 tm.tm_isdst = tmp->tm_isdst; |
| 303 | 918 yyMeridian = MER24; |
| 919 yyRelSeconds = 0; | |
|
852
2156a43352c1
1997-01-06 Paul Eggert <eggert@twinsun.com>
Jim Meyering <jim@meyering.net>
parents:
814
diff
changeset
|
920 yyRelMinutes = 0; |
|
2156a43352c1
1997-01-06 Paul Eggert <eggert@twinsun.com>
Jim Meyering <jim@meyering.net>
parents:
814
diff
changeset
|
921 yyRelHour = 0; |
|
2156a43352c1
1997-01-06 Paul Eggert <eggert@twinsun.com>
Jim Meyering <jim@meyering.net>
parents:
814
diff
changeset
|
922 yyRelDay = 0; |
| 303 | 923 yyRelMonth = 0; |
|
852
2156a43352c1
1997-01-06 Paul Eggert <eggert@twinsun.com>
Jim Meyering <jim@meyering.net>
parents:
814
diff
changeset
|
924 yyRelYear = 0; |
| 303 | 925 yyHaveDate = 0; |
| 926 yyHaveDay = 0; | |
| 927 yyHaveRel = 0; | |
| 928 yyHaveTime = 0; | |
| 929 yyHaveZone = 0; | |
| 9 | 930 |
| 303 | 931 if (yyparse () |
| 932 || yyHaveTime > 1 || yyHaveZone > 1 || yyHaveDate > 1 || yyHaveDay > 1) | |
| 933 return -1; | |
| 9 | 934 |
|
852
2156a43352c1
1997-01-06 Paul Eggert <eggert@twinsun.com>
Jim Meyering <jim@meyering.net>
parents:
814
diff
changeset
|
935 tm.tm_year = ToYear (yyYear) - TM_YEAR_ORIGIN + yyRelYear; |
|
2156a43352c1
1997-01-06 Paul Eggert <eggert@twinsun.com>
Jim Meyering <jim@meyering.net>
parents:
814
diff
changeset
|
936 tm.tm_mon = yyMonth - 1 + yyRelMonth; |
|
2156a43352c1
1997-01-06 Paul Eggert <eggert@twinsun.com>
Jim Meyering <jim@meyering.net>
parents:
814
diff
changeset
|
937 tm.tm_mday = yyDay + yyRelDay; |
| 857 | 938 if (yyHaveTime || (yyHaveRel && !yyHaveDate && !yyHaveDay)) |
| 939 { | |
| 940 tm.tm_hour = ToHour (yyHour, yyMeridian); | |
| 941 if (tm.tm_hour < 0) | |
| 942 return -1; | |
| 943 tm.tm_min = yyMinutes; | |
| 944 tm.tm_sec = yySeconds; | |
| 945 } | |
| 946 else | |
| 947 { | |
| 948 tm.tm_hour = tm.tm_min = tm.tm_sec = 0; | |
| 949 } | |
|
852
2156a43352c1
1997-01-06 Paul Eggert <eggert@twinsun.com>
Jim Meyering <jim@meyering.net>
parents:
814
diff
changeset
|
950 tm.tm_hour += yyRelHour; |
|
2156a43352c1
1997-01-06 Paul Eggert <eggert@twinsun.com>
Jim Meyering <jim@meyering.net>
parents:
814
diff
changeset
|
951 tm.tm_min += yyRelMinutes; |
|
2156a43352c1
1997-01-06 Paul Eggert <eggert@twinsun.com>
Jim Meyering <jim@meyering.net>
parents:
814
diff
changeset
|
952 tm.tm_sec += yyRelSeconds; |
|
2156a43352c1
1997-01-06 Paul Eggert <eggert@twinsun.com>
Jim Meyering <jim@meyering.net>
parents:
814
diff
changeset
|
953 tm0 = tm; |
|
2156a43352c1
1997-01-06 Paul Eggert <eggert@twinsun.com>
Jim Meyering <jim@meyering.net>
parents:
814
diff
changeset
|
954 |
|
2156a43352c1
1997-01-06 Paul Eggert <eggert@twinsun.com>
Jim Meyering <jim@meyering.net>
parents:
814
diff
changeset
|
955 Start = mktime (&tm); |
|
2156a43352c1
1997-01-06 Paul Eggert <eggert@twinsun.com>
Jim Meyering <jim@meyering.net>
parents:
814
diff
changeset
|
956 |
| 857 | 957 if (Start == (time_t) -1) |
| 958 { | |
|
852
2156a43352c1
1997-01-06 Paul Eggert <eggert@twinsun.com>
Jim Meyering <jim@meyering.net>
parents:
814
diff
changeset
|
959 |
| 857 | 960 /* Guard against falsely reporting errors near the time_t boundaries |
| 961 when parsing times in other time zones. For example, if the min | |
| 962 time_t value is 1970-01-01 00:00:00 UTC and we are 8 hours ahead | |
| 963 of UTC, then the min localtime value is 1970-01-01 08:00:00; if | |
| 964 we apply mktime to 1970-01-01 00:00:00 we will get an error, so | |
| 965 we apply mktime to 1970-01-02 08:00:00 instead and adjust the time | |
| 966 zone by 24 hours to compensate. This algorithm assumes that | |
| 967 there is no DST transition within a day of the time_t boundaries. */ | |
| 968 if (yyHaveZone) | |
| 969 { | |
| 970 tm = tm0; | |
| 971 if (tm.tm_year <= EPOCH - TM_YEAR_ORIGIN) | |
| 972 { | |
| 973 tm.tm_mday++; | |
| 974 yyTimezone -= 24 * 60; | |
| 975 } | |
| 976 else | |
| 977 { | |
| 978 tm.tm_mday--; | |
| 979 yyTimezone += 24 * 60; | |
| 980 } | |
| 981 Start = mktime (&tm); | |
| 982 } | |
| 983 | |
| 984 if (Start == (time_t) -1) | |
| 985 return Start; | |
|
852
2156a43352c1
1997-01-06 Paul Eggert <eggert@twinsun.com>
Jim Meyering <jim@meyering.net>
parents:
814
diff
changeset
|
986 } |
|
855
9c89b90524b8
(get_date): Change prototype to reflect const'ness of parameters.
Jim Meyering <jim@meyering.net>
parents:
852
diff
changeset
|
987 |
| 857 | 988 if (yyHaveDay && !yyHaveDate) |
| 989 { | |
| 990 tm.tm_mday += ((yyDayNumber - tm.tm_wday + 7) % 7 | |
| 991 + 7 * (yyDayOrdinal - (0 < yyDayOrdinal))); | |
| 992 Start = mktime (&tm); | |
| 993 if (Start == (time_t) -1) | |
| 994 return Start; | |
| 995 } | |
| 9 | 996 |
| 857 | 997 if (yyHaveZone) |
| 998 { | |
|
1761
14b8e8de40c8
(get_date): Reuse tm_isdst of first localtime
Jim Meyering <jim@meyering.net>
parents:
1717
diff
changeset
|
999 long delta; |
|
14b8e8de40c8
(get_date): Reuse tm_isdst of first localtime
Jim Meyering <jim@meyering.net>
parents:
1717
diff
changeset
|
1000 struct tm *gmt = gmtime (&Start); |
|
14b8e8de40c8
(get_date): Reuse tm_isdst of first localtime
Jim Meyering <jim@meyering.net>
parents:
1717
diff
changeset
|
1001 if (!gmt) |
|
14b8e8de40c8
(get_date): Reuse tm_isdst of first localtime
Jim Meyering <jim@meyering.net>
parents:
1717
diff
changeset
|
1002 return -1; |
|
14b8e8de40c8
(get_date): Reuse tm_isdst of first localtime
Jim Meyering <jim@meyering.net>
parents:
1717
diff
changeset
|
1003 delta = yyTimezone * 60L + difftm (&tm, gmt); |
| 857 | 1004 if ((Start + delta < Start) != (delta < 0)) |
| 1005 return -1; /* time_t overflow */ | |
| 1006 Start += delta; | |
| 1007 } | |
|
852
2156a43352c1
1997-01-06 Paul Eggert <eggert@twinsun.com>
Jim Meyering <jim@meyering.net>
parents:
814
diff
changeset
|
1008 |
|
2156a43352c1
1997-01-06 Paul Eggert <eggert@twinsun.com>
Jim Meyering <jim@meyering.net>
parents:
814
diff
changeset
|
1009 return Start; |
| 9 | 1010 } |
| 1011 | |
| 303 | 1012 #if defined (TEST) |
| 9 | 1013 |
| 1014 /* ARGSUSED */ | |
| 202 | 1015 int |
| 303 | 1016 main (ac, av) |
| 857 | 1017 int ac; |
| 1018 char *av[]; | |
| 9 | 1019 { |
| 321 | 1020 char buff[MAX_BUFF_LEN + 1]; |
| 1021 time_t d; | |
| 9 | 1022 |
| 857 | 1023 (void) printf ("Enter date, or blank line to exit.\n\t> "); |
| 1024 (void) fflush (stdout); | |
| 321 | 1025 |
| 1026 buff[MAX_BUFF_LEN] = 0; | |
| 857 | 1027 while (fgets (buff, MAX_BUFF_LEN, stdin) && buff[0]) |
| 1028 { | |
| 1029 d = get_date (buff, (time_t *) NULL); | |
| 1030 if (d == -1) | |
| 1031 (void) printf ("Bad format - couldn't convert.\n"); | |
| 1032 else | |
| 1033 (void) printf ("%s", ctime (&d)); | |
| 1034 (void) printf ("\t> "); | |
| 1035 (void) fflush (stdout); | |
| 1036 } | |
| 303 | 1037 exit (0); |
| 1038 /* NOTREACHED */ | |
| 9 | 1039 } |
| 857 | 1040 #endif /* defined (TEST) */ |