diplodocus.org Git - nmh/blob - sbr/m_convert.c

   1
   2 /*
   3  * m_convert.c -- parse a message range or sequence and set SELECTED
   4  *
   5  * This code is Copyright (c) 2002, by the authors of nmh.  See the
   6  * COPYRIGHT file in the root directory of the nmh distribution for
   7  * complete copyright information.
   8  */
   9
  10 #include <h/mh.h>
  11
  12 /*
  13  * error codes for sequence
  14  * and message range processing
  15  */
  16 #define BADMSG  (-2)
  17 #define BADRNG  (-3)
  18 #define BADNEW  (-4)
  19 #define BADNUM  (-5)
  20 #define BADLST  (-6)
  21
  22 #define FIRST   1
  23 #define LAST    2
  24
  25 #define getnew(mp) (mp->hghmsg + 1)
  26
  27 static int convdir;     /* convert direction */
  28 static char *delimp;
  29
  30 /*
  31  * static prototypes
  32  */
  33 static int m_conv (struct msgs *, char *, int);
  34 static int attr (struct msgs *, char *);
  35
  36
  37 int
  38 m_convert (struct msgs *mp, char *name)
  39 {
  40     int first, last, found, range, err;
  41     unsigned char *bp;
  42     char *cp;
  43
  44     /* check if user defined sequence */
  45     err = attr (mp, cp = name);
  46
  47     if (err == -1)
  48         return 0;
  49     else if (err < 0)
  50         goto badmsg;
  51     else if (err > 0)
  52         return 1;
  53     /*
  54      * else err == 0, so continue
  55      */
  56
  57     found = 0;
  58
  59     /*
  60      * Check for special "new" sequence, which
  61      * is valid only if ALLOW_NEW is set.
  62      */
  63     if ((mp->msgflags & ALLOW_NEW) && !strcmp (cp, "new")) {
  64         if ((err = first = getnew (mp)) <= 0)
  65             goto badmsg;
  66         else
  67             goto single;
  68     }
  69
  70     if (!strcmp (cp, "all"))
  71         cp = "first-last";
  72
  73     if ((err = first = m_conv (mp, cp, FIRST)) <= 0)
  74         goto badmsg;
  75
  76     cp = delimp;
  77     if (*cp != '\0' && *cp != '-' && *cp != ':') {
  78 badelim:
  79         advise (NULL, "illegal argument delimiter: `%c'(0%o)", *delimp, *delimp);
  80         return 0;
  81     }
  82
  83     if (*cp == '-') {
  84         cp++;
  85         if ((err = last = m_conv (mp, cp, LAST)) <= 0) {
  86 badmsg:
  87             switch (err) {
  88             case BADMSG:
  89                 advise (NULL, "no %s message", cp);
  90                 break;
  91
  92             case BADNUM:
  93                 advise (NULL, "message %s doesn't exist", cp);
  94                 break;
  95
  96             case BADRNG:
  97                 advise (NULL, "message %s out of range 1-%d", cp, mp->hghmsg);
  98                 break;
  99
 100             case BADLST:
 101 badlist:
 102                 advise (NULL, "bad message list %s", name);
 103                 break;
 104
 105             case BADNEW:
 106                 advise (NULL, "folder full, no %s message", name);
 107                 break;
 108
 109             default:
 110                 advise (NULL, "no messages match specification");
 111             }
 112             return 0;
 113         }
 114
 115         if (last < first)
 116             goto badlist;
 117         if (*delimp)
 118             goto badelim;
 119         if (first > mp->hghmsg || last < mp->lowmsg) {
 120 rangerr:
 121             advise (NULL, "no messages in range %s", name);
 122             return 0;
 123         }
 124
 125         /* tighten the range to search */
 126         if (last > mp->hghmsg)
 127             last = mp->hghmsg;
 128         if (first < mp->lowmsg)
 129             first = mp->lowmsg;
 130
 131     } else if (*cp == ':') {
 132         cp++;
 133         if (*cp == '-') {
 134             convdir = -1;
 135             cp++;
 136         } else {
 137             if (*cp == '+') {
 138                 convdir = 1;
 139                 cp++;
 140             }
 141         }
 142         if ((range = atoi (bp = cp)) == 0)
 143             goto badlist;
 144         while (isdigit (*bp))
 145             bp++;
 146         if (*bp)
 147             goto badelim;
 148         if ((convdir > 0 && first > mp->hghmsg)
 149             || (convdir < 0 && first < mp->lowmsg))
 150             goto rangerr;
 151
 152         /* tighten the range to search */
 153         if (first < mp->lowmsg)
 154             first = mp->lowmsg;
 155         if (first > mp->hghmsg)
 156             first = mp->hghmsg;
 157
 158         for (last = first;
 159              last >= mp->lowmsg && last <= mp->hghmsg;
 160              last += convdir)
 161             if (does_exist (mp, last))
 162                 if (--range <= 0)
 163                     break;
 164         if (last < mp->lowmsg)
 165             last = mp->lowmsg;
 166         if (last > mp->hghmsg)
 167             last = mp->hghmsg;
 168         if (last < first) {
 169             range = last;
 170             last = first;
 171             first = range;
 172         }
 173     } else {
 174
 175 single:
 176         /*
 177          * Single Message
 178          *
 179          * If ALLOW_NEW is set, then allow selecting of an
 180          * empty slot.  If ALLOW_NEW is not set, then we
 181          * check if message is in-range and exists.
 182          */
 183         if (mp->msgflags & ALLOW_NEW) {
 184             set_select_empty (mp, first);
 185         } else {
 186             if (first > mp->hghmsg
 187                 || first < mp->lowmsg
 188                 || !(does_exist (mp, first))) {
 189                 if (!strcmp (name, "cur") || !strcmp (name, "."))
 190                     advise (NULL, "no %s message", name);
 191                 else
 192                     advise (NULL, "message %d doesn't exist", first);
 193                 return 0;
 194             }
 195         }
 196         last = first;   /* range of 1 */
 197     }
 198
 199     /*
 200      * Cycle through the range and select the messages
 201      * that exist.  If ALLOW_NEW is set, then we also check
 202      * if we are selecting an empty slot.
 203      */
 204     for (; first <= last; first++) {
 205         if (does_exist (mp, first) ||
 206             ((mp->msgflags & ALLOW_NEW) && is_select_empty (mp, first))) {
 207             if (!is_selected (mp, first)) {
 208                 set_selected (mp, first);
 209                 mp->numsel++;
 210                 if (mp->lowsel == 0 || first < mp->lowsel)
 211                     mp->lowsel = first;
 212                 if (first > mp->hghsel)
 213                     mp->hghsel = first;
 214             }
 215             found++;
 216         }
 217     }
 218
 219     if (!found)
 220         goto rangerr;
 221
 222     return 1;
 223 }
 224
 225 /*
 226  * Convert the various message names to
 227  * their numeric values.
 228  *
 229  * n     (integer)
 230  * prev
 231  * next
 232  * first
 233  * last
 234  * cur
 235  * .     (same as cur)
 236  */
 237
 238 static int
 239 m_conv (struct msgs *mp, char *str, int call)
 240 {
 241     register int i;
 242     register unsigned char *cp, *bp;
 243     unsigned char buf[16];
 244
 245     convdir = 1;
 246     cp = bp = str;
 247     if (isdigit (*cp)) {
 248         while (isdigit (*bp))
 249             bp++;
 250         delimp = bp;
 251         i = atoi (cp);
 252
 253         if (i <= mp->hghmsg)
 254             return i;
 255         else if (*delimp || call == LAST)
 256             return mp->hghmsg + 1;
 257         else if (mp->msgflags & ALLOW_NEW)
 258             return BADRNG;
 259         else
 260             return BADNUM;
 261     }
 262
 263 #ifdef LOCALE
 264     /* doesn't enforce lower case */
 265     for (bp = buf; (isalpha(*cp) || *cp == '.')
 266                 && (bp - buf < sizeof(buf) - 1); )
 267 #else
 268     for (bp = buf; ((*cp >= 'a' && *cp <= 'z') || *cp == '.')
 269                 && (bp - buf < sizeof(buf) - 1); )
 270 #endif /* LOCALE */
 271     {
 272         *bp++ = *cp++;
 273     }
 274     *bp++ = '\0';
 275     delimp = cp;
 276
 277     if (!strcmp (buf, "first"))
 278         return (mp->hghmsg || !(mp->msgflags & ALLOW_NEW)
 279                 ? mp->lowmsg : BADMSG);
 280
 281     if (!strcmp (buf, "last")) {
 282         convdir = -1;
 283         return (mp->hghmsg || !(mp->msgflags & ALLOW_NEW) ? mp->hghmsg : BADMSG);
 284     }
 285
 286     if (!strcmp (buf, "cur") || !strcmp (buf, "."))
 287         return (mp->curmsg > 0 ? mp->curmsg : BADMSG);
 288
 289     if (!strcmp (buf, "prev")) {
 290         convdir = -1;
 291         for (i = (mp->curmsg <= mp->hghmsg) ? mp->curmsg - 1 : mp->hghmsg;
 292                 i >= mp->lowmsg; i--) {
 293             if (does_exist (mp, i))
 294                 return i;
 295         }
 296         return BADMSG;
 297     }
 298
 299     if (!strcmp (buf, "next")) {
 300         for (i = (mp->curmsg >= mp->lowmsg) ? mp->curmsg + 1 : mp->lowmsg;
 301                 i <= mp->hghmsg; i++) {
 302             if (does_exist (mp, i))
 303                 return i;
 304         }
 305         return BADMSG;
 306     }
 307
 308     return BADLST;
 309 }
 310
 311 /*
 312  * Handle user defined sequences.
 313  * They can take the following forms:
 314  *
 315  * seq
 316  * seq:prev
 317  * seq:next
 318  * seq:first
 319  * seq:last
 320  * seq:+n
 321  * seq:-n
 322  * seq:n
 323  */
 324
 325 static int
 326 attr (struct msgs *mp, char *cp)
 327 {
 328     register unsigned char *dp;
 329     char *bp = NULL;
 330     register int i, j;
 331     int found,
 332         inverted = 0,
 333         range = 0,              /* no range */
 334         first = 0;
 335
 336     /* hack for "cur-name", "cur-n", etc. */
 337     if (!strcmp (cp, "cur"))
 338         return 0;
 339     if (ssequal ("cur:", cp))   /* this code need to be rewritten... */
 340         return 0;
 341
 342     /* Check for sequence negation */
 343     if ((dp = context_find (nsequence)) && *dp != '\0' && ssequal (dp, cp)) {
 344         inverted = 1;
 345         cp += strlen (dp);
 346     }
 347
 348     convdir = 1;        /* convert direction */
 349
 350     for (dp = cp; *dp && isalnum(*dp); dp++)
 351         continue;
 352
 353     if (*dp == ':') {
 354         bp = dp++;
 355         range = 1;
 356
 357         /*
 358          * seq:prev  (or)
 359          * seq:next  (or)
 360          * seq:first (or)
 361          * seq:last
 362          */
 363         if (isalpha (*dp)) {
 364             if (!strcmp (dp, "prev")) {
 365                 convdir = -1;
 366                 first = (mp->curmsg > 0) && (mp->curmsg <= mp->hghmsg)
 367                         ? mp->curmsg - 1
 368                         : mp->hghmsg;
 369             }
 370             else if (!strcmp (dp, "next")) {
 371                 convdir = 1;
 372                 first = (mp->curmsg >= mp->lowmsg)
 373                             ? mp->curmsg + 1
 374                             : mp->lowmsg;
 375             }
 376             else if (!strcmp (dp, "first")) {
 377                 convdir = 1;
 378             }
 379             else if (!strcmp (dp, "last")) {
 380                 convdir = -1;
 381             }
 382             else
 383                 return BADLST;
 384         } else {
 385             /*
 386              * seq:n  (or)
 387              * seq:+n (or)
 388              * seq:-n
 389              */
 390             if (*dp == '+')
 391                 dp++;
 392             else if (*dp == '-') {
 393                 dp++;
 394                 convdir = -1;
 395             }
 396             if ((range = atoi(dp)) == 0)
 397                 return BADLST;
 398             while (isdigit (*dp))
 399                 dp++;
 400             if (*dp)
 401                 return BADLST;
 402         }
 403
 404         *bp = '\0';     /* temporarily terminate sequence name */
 405     }
 406
 407     i = seq_getnum (mp, cp);    /* get index of sequence */
 408
 409     if (bp)
 410         *bp = ':';              /* restore sequence name */
 411     if (i == -1)
 412         return 0;
 413
 414     found = 0;  /* count the number we select for this argument */
 415
 416     for (j = first ? first : (convdir > 0) ? mp->lowmsg : mp->hghmsg;
 417                 j >= mp->lowmsg && j <= mp->hghmsg; j += convdir) {
 418         if (does_exist (mp, j)
 419                 && inverted ? !in_sequence (mp, i, j) : in_sequence (mp, i, j)) {
 420             if (!is_selected (mp, j)) {
 421                 set_selected (mp, j);
 422                 mp->numsel++;
 423                 if (mp->lowsel == 0 || j < mp->lowsel)
 424                     mp->lowsel = j;
 425                 if (j > mp->hghsel)
 426                     mp->hghsel = j;
 427             }
 428             found++;
 429
 430             /*
 431              * If we have a range, then break out
 432              * once we've found enough.
 433              */
 434             if (range && found >= range)
 435                 break;
 436         }
 437     }
 438
 439     if (found > 0)
 440         return found;
 441
 442     if (first)
 443         return BADMSG;
 444     advise (NULL, "sequence %s %s", cp, inverted ? "full" : "empty");
 445     return -1;
 446 }