strings.c

   1 /* $Id: strings.c,v 1.28 2009/03/13 07:46:10 kristaps Exp $ */
   2 /*
   3  * Copyright (c) 2008 Kristaps Dzonsons <kristaps@kth.se>
   4  *
   5  * Permission to use, copy, modify, and distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the
   7  * above copyright notice and this permission notice appear in all
   8  * copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
  11  * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
  12  * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
  13  * AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
  14  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  15  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  16  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  17  * PERFORMANCE OF THIS SOFTWARE.
  18  */
  19 #include <sys/types.h>
  20
  21 #include <assert.h>
  22 #include <ctype.h>
  23 #include <stdlib.h>
  24 #include <stdio.h>
  25 #include <string.h>
  26
  27 #include "private.h"
  28
  29 /*
  30  * Various string-literal operations:  converting scalars to and from
  31  * strings, etc.
  32  */
  33
  34 struct mdoc_secname {
  35         const char      *name;
  36         int              flag;
  37 #define MSECNAME_META   (1 << 0)
  38 };
  39
  40 /* Section names corresponding to mdoc_sec. */
  41
  42 static  const struct mdoc_secname secnames[] = {
  43         { "PROLOGUE", MSECNAME_META },
  44         { "BODY", MSECNAME_META },
  45         { "NAME", 0 },
  46         { "LIBRARY", 0 },
  47         { "SYNOPSIS", 0 },
  48         { "DESCRIPTION", 0 },
  49         { "IMPLEMENTATION NOTES", 0 },
  50         { "RETURN VALUES", 0 },
  51         { "ENVIRONMENT", 0 },
  52         { "FILES", 0 },
  53         { "EXAMPLES", 0 },
  54         { "DIAGNOSTICS", 0 },
  55         { "COMPATIBILITY", 0 },
  56         { "ERRORS", 0 },
  57         { "SEE ALSO", 0 },
  58         { "STANDARDS", 0 },
  59         { "HISTORY", 0 },
  60         { "AUTHORS", 0 },
  61         { "CAVEATS", 0 },
  62         { "BUGS", 0 },
  63         { NULL, 0 }
  64 };
  65
  66 #ifdef __linux__
  67 extern  char            *strptime(const char *, const char *, struct tm *);
  68 #endif
  69
  70
  71 size_t
  72 mdoc_isescape(const char *p)
  73 {
  74         size_t           c;
  75
  76         if ('\\' != *p++)
  77                 return(0);
  78
  79         switch (*p) {
  80         case ('\\'):
  81                 /* FALLTHROUGH */
  82         case ('\''):
  83                 /* FALLTHROUGH */
  84         case ('`'):
  85                 /* FALLTHROUGH */
  86         case ('q'):
  87                 /* FALLTHROUGH */
  88         case ('-'):
  89                 /* FALLTHROUGH */
  90         case (' '):
  91                 /* FALLTHROUGH */
  92         case ('&'):
  93                 /* FALLTHROUGH */
  94         case ('.'):
  95                 /* FALLTHROUGH */
  96         case ('e'):
  97                 return(2);
  98         case ('*'):
  99                 if (0 == *++p || ! isgraph((u_char)*p))
 100                         return(0);
 101                 switch (*p) {
 102                 case ('('):
 103                         if (0 == *++p || ! isgraph((u_char)*p))
 104                                 return(0);
 105                         return(4);
 106                 case ('['):
 107                         for (c = 3, p++; *p && ']' != *p; p++, c++)
 108                                 if ( ! isgraph((u_char)*p))
 109                                         break;
 110                         return(*p == ']' ? c : 0);
 111                 default:
 112                         break;
 113                 }
 114                 return(3);
 115         case ('('):
 116                 if (0 == *++p || ! isgraph((u_char)*p))
 117                         return(0);
 118                 if (0 == *++p || ! isgraph((u_char)*p))
 119                         return(0);
 120                 return(4);
 121         case ('['):
 122                 break;
 123         default:
 124                 return(0);
 125         }
 126
 127         for (c = 3, p++; *p && ']' != *p; p++, c++)
 128                 if ( ! isgraph((u_char)*p))
 129                         break;
 130
 131         return(*p == ']' ? c : 0);
 132 }
 133
 134
 135 int
 136 mdoc_iscdelim(char p)
 137 {
 138
 139         switch (p) {
 140         case('.'):
 141                 /* FALLTHROUGH */
 142         case(','):
 143                 /* FALLTHROUGH */
 144         case(';'):
 145                 /* FALLTHROUGH */
 146         case(':'):
 147                 /* FALLTHROUGH */
 148         case('?'):
 149                 /* FALLTHROUGH */
 150         case('!'):
 151                 /* FALLTHROUGH */
 152         case('('):
 153                 /* FALLTHROUGH */
 154         case(')'):
 155                 /* FALLTHROUGH */
 156         case('['):
 157                 /* FALLTHROUGH */
 158         case(']'):
 159                 /* FALLTHROUGH */
 160         case('{'):
 161                 /* FALLTHROUGH */
 162         case('}'):
 163                 return(1);
 164         default:
 165                 break;
 166         }
 167
 168         return(0);
 169 }
 170
 171
 172 int
 173 mdoc_isdelim(const char *p)
 174 {
 175
 176         if (0 == *p)
 177                 return(0);
 178         if (0 != *(p + 1))
 179                 return(0);
 180         return(mdoc_iscdelim(*p));
 181 }
 182
 183
 184 enum mdoc_sec
 185 mdoc_atosec(const char *p)
 186 {
 187         const struct mdoc_secname *n;
 188         int                        i;
 189
 190         for (i = 0, n = secnames; n->name; n++, i++)
 191                 if ( ! (n->flag & MSECNAME_META))
 192                         if (xstrcmp(p, n->name))
 193                                 return((enum mdoc_sec)i);
 194
 195         return(SEC_CUSTOM);
 196 }
 197
 198
 199 time_t
 200 mdoc_atotime(const char *p)
 201 {
 202         struct tm        tm;
 203         char            *pp;
 204
 205         (void)memset(&tm, 0, sizeof(struct tm));
 206
 207         if (xstrcmp(p, "$Mdocdate: March 13 2009 $"))
 208                 return(time(NULL));
 209         if ((pp = strptime(p, "$Mdocdate: March 13 2009 $", &tm)) && 0 == *pp)
 210                 return(mktime(&tm));
 211         /* XXX - this matches "June 1999", which is wrong. */
 212         if ((pp = strptime(p, "%b %d %Y", &tm)) && 0 == *pp)
 213                 return(mktime(&tm));
 214         if ((pp = strptime(p, "%b %d, %Y", &tm)) && 0 == *pp)
 215                 return(mktime(&tm));
 216
 217         return(0);
 218 }
 219
 220
 221 size_t
 222 mdoc_macro2len(int macro)
 223 {
 224
 225         switch (macro) {
 226         case(MDOC_Ad):
 227                 return(12);
 228         case(MDOC_Ao):
 229                 return(12);
 230         case(MDOC_An):
 231                 return(12);
 232         case(MDOC_Aq):
 233                 return(12);
 234         case(MDOC_Ar):
 235                 return(12);
 236         case(MDOC_Bo):
 237                 return(12);
 238         case(MDOC_Bq):
 239                 return(12);
 240         case(MDOC_Cd):
 241                 return(12);
 242         case(MDOC_Cm):
 243                 return(10);
 244         case(MDOC_Do):
 245                 return(10);
 246         case(MDOC_Dq):
 247                 return(12);
 248         case(MDOC_Dv):
 249                 return(12);
 250         case(MDOC_Eo):
 251                 return(12);
 252         case(MDOC_Em):
 253                 return(10);
 254         case(MDOC_Er):
 255                 return(12);
 256         case(MDOC_Ev):
 257                 return(15);
 258         case(MDOC_Fa):
 259                 return(12);
 260         case(MDOC_Fl):
 261                 return(10);
 262         case(MDOC_Fo):
 263                 return(16);
 264         case(MDOC_Fn):
 265                 return(16);
 266         case(MDOC_Ic):
 267                 return(10);
 268         case(MDOC_Li):
 269                 return(16);
 270         case(MDOC_Ms):
 271                 return(6);
 272         case(MDOC_Nm):
 273                 return(10);
 274         case(MDOC_No):
 275                 return(12);
 276         case(MDOC_Oo):
 277                 return(10);
 278         case(MDOC_Op):
 279                 return(14);
 280         case(MDOC_Pa):
 281                 return(32);
 282         case(MDOC_Pf):
 283                 return(12);
 284         case(MDOC_Po):
 285                 return(12);
 286         case(MDOC_Pq):
 287                 return(12);
 288         case(MDOC_Ql):
 289                 return(16);
 290         case(MDOC_Qo):
 291                 return(12);
 292         case(MDOC_So):
 293                 return(12);
 294         case(MDOC_Sq):
 295                 return(12);
 296         case(MDOC_Sy):
 297                 return(6);
 298         case(MDOC_Sx):
 299                 return(16);
 300         case(MDOC_Tn):
 301                 return(10);
 302         case(MDOC_Va):
 303                 return(12);
 304         case(MDOC_Vt):
 305                 return(12);
 306         case(MDOC_Xr):
 307                 return(10);
 308         default:
 309                 break;
 310         };
 311         return(0);
 312 }