diplodocus.org Git - nmh/blob - uip/scansbr.c

   1
   2 /*
   3  * scansbr.c -- routines to help scan along...
   4  *
   5  * $Id$
   6  *
   7  * This code is Copyright (c) 2002, by the authors of nmh.  See the
   8  * COPYRIGHT file in the root directory of the nmh distribution for
   9  * complete copyright information.
  10  */
  11
  12 #include <h/mh.h>
  13 #include <h/addrsbr.h>
  14 #include <h/fmt_scan.h>
  15 #include <h/scansbr.h>
  16 #include <h/tws.h>
  17 #include <h/utils.h>
  18
  19 #ifdef _FSTDIO
  20 # define _ptr _p                /* Gag    */
  21 # define _cnt _w                /* Wretch */
  22 #endif
  23
  24 #ifdef SCO_5_STDIO
  25 # define _ptr  __ptr
  26 # define _cnt  __cnt
  27 # define _base __base
  28 # define _filbuf(fp)  ((fp)->__cnt = 0, __filbuf(fp))
  29 #endif
  30
  31 #define MAXSCANL 256            /* longest possible scan line */
  32
  33 /*
  34  * Buffer size for content part of header fields.  We want this
  35  * to be large enough so that we don't do a lot of extra FLDPLUS
  36  * calls on m_getfld but small enough so that we don't snarf
  37  * the entire message body when we're only going to display 30
  38  * characters of it.
  39  */
  40 #define SBUFSIZ 512
  41
  42 static struct format *fmt;
  43 #ifdef JLR
  44 static struct format *fmt_top;
  45 #endif /* JLR */
  46
  47 static struct comp *datecomp;           /* pntr to "date" comp             */
  48 static struct comp *bodycomp;           /* pntr to "body" pseudo-comp      *
  49                                          * (if referenced)                 */
  50 static int ncomps = 0;                  /* # of interesting components     */
  51 static char **compbuffers = 0;          /* buffers for component text      */
  52 static struct comp **used_buf = 0;      /* stack for comp that use buffers */
  53
  54 static int dat[5];                      /* aux. data for format routine    */
  55
  56 char *scanl = 0;                        /* text of most recent scanline    */
  57
  58 #define DIEWRERR() adios (scnmsg, "write error on")
  59
  60 #define FPUTS(buf) {\
  61                 if (mh_fputs(buf,scnout) == EOF)\
  62                     DIEWRERR();\
  63                 }
  64
  65 /*
  66  * prototypes
  67  */
  68 int sc_width (void);                    /* from termsbr.c */
  69 static int mh_fputs(char *, FILE *);
  70
  71
  72 int
  73 scan (FILE *inb, int innum, int outnum, char *nfs, int width, int curflg,
  74       int unseen, char *folder, long size, int noisy)
  75 {
  76     int i, compnum, encrypted, state;
  77     char *cp, *tmpbuf, **nxtbuf;
  78     char *saved_c_text;
  79     struct comp *cptr;
  80     struct comp **savecomp;
  81     char *scnmsg;
  82     FILE *scnout;
  83     char name[NAMESZ];
  84     static int rlwidth, slwidth;
  85
  86 #ifdef RPATHS
  87     char returnpath[BUFSIZ];
  88     char deliverydate[BUFSIZ];
  89 #endif
  90
  91     /* first-time only initialization */
  92     if (!scanl) {
  93         if (width == 0) {
  94             if ((width = sc_width ()) < WIDTH/2)
  95                 width = WIDTH/2;
  96             else if (width > MAXSCANL)
  97                 width = MAXSCANL;
  98         }
  99         dat[3] = slwidth = width;
 100         scanl = (char *) mh_xmalloc((size_t) MB_CUR_MAX * (slwidth + 2) );
 101         if (outnum)
 102             umask(~m_gmprot());
 103
 104         /* Compile format string */
 105         ncomps = fmt_compile (nfs, &fmt) + 1;
 106
 107 #ifdef JLR
 108         fmt_top = fmt;
 109 #endif  /* JLR */
 110         FINDCOMP(bodycomp, "body");
 111         FINDCOMP(datecomp, "date");
 112         FINDCOMP(cptr, "folder");
 113         if (cptr && folder)
 114             cptr->c_text = folder;
 115         FINDCOMP(cptr, "encrypted");
 116         if (!cptr)
 117             if ((cptr = (struct comp *) calloc (1, sizeof(*cptr)))) {
 118                 cptr->c_name = "encrypted";
 119                 cptr->c_next = wantcomp[i = CHASH (cptr->c_name)];
 120                 wantcomp[i] = cptr;
 121                 ncomps++;
 122         }
 123         FINDCOMP (cptr, "dtimenow");
 124         if (cptr)
 125             cptr->c_text = getcpy(dtimenow (0));
 126         nxtbuf = compbuffers = (char **) calloc((size_t) ncomps, sizeof(char *));
 127         if (nxtbuf == NULL)
 128             adios (NULL, "unable to allocate component buffers");
 129         used_buf = (struct comp **) calloc((size_t) (ncomps+1),
 130             sizeof(struct comp *));
 131         if (used_buf == NULL)
 132             adios (NULL, "unable to allocate component buffer stack");
 133         used_buf += ncomps+1; *--used_buf = 0;
 134         rlwidth = bodycomp && (width > SBUFSIZ) ? width : SBUFSIZ;
 135         for (i = ncomps; i--; )
 136             *nxtbuf++ = mh_xmalloc(rlwidth);
 137     }
 138
 139     /*
 140      * each-message initialization
 141      */
 142     nxtbuf = compbuffers;
 143     savecomp = used_buf;
 144     tmpbuf = *nxtbuf++;
 145     dat[0] = innum ? innum : outnum;
 146     dat[1] = curflg;
 147     dat[4] = unseen;
 148
 149     /*
 150      * Get the first field.  If the message is non-empty
 151      * and we're doing an "inc", open the output file.
 152      */
 153     if ((state = m_getfld (FLD, name, tmpbuf, rlwidth, inb)) == FILEEOF) {
 154         if (ferror(inb)) {
 155             advise("read", "unable to"); /* "read error" */
 156             return SCNFAT;
 157         } else {
 158             return SCNEOF;
 159         }
 160     }
 161
 162     if (outnum) {
 163         if (outnum > 0) {
 164             scnmsg = m_name (outnum);
 165             if (*scnmsg == '?')         /* msg num out of range */
 166                 return SCNNUM;
 167         } else {
 168             scnmsg = "/dev/null";
 169         }
 170         if ((scnout = fopen (scnmsg, "w")) == NULL)
 171             adios (scnmsg, "unable to write");
 172 #ifdef RPATHS
 173         /*
 174          * Add the Return-Path and Delivery-Date
 175          * header fields to message.
 176          */
 177         if (get_returnpath (returnpath, sizeof(returnpath),
 178                 deliverydate, sizeof(deliverydate))) {
 179             FPUTS ("Return-Path: ");
 180             FPUTS (returnpath);
 181             FPUTS ("Delivery-Date: ");
 182             FPUTS (deliverydate);
 183         }
 184 #endif /* RPATHS */
 185     }
 186
 187     /* scan - main loop */
 188     for (compnum = 1; ; state = m_getfld (state, name, tmpbuf, rlwidth, inb)) {
 189         switch (state) {
 190             case FLD:
 191             case FLDPLUS:
 192                 compnum++;
 193                 if (outnum) {
 194                     FPUTS (name);
 195                     if ( putc (':', scnout) == EOF) DIEWRERR();
 196                     FPUTS (tmpbuf);
 197                 }
 198                 /*
 199                  * if we're interested in this component, save a pointer
 200                  * to the component text, then start using our next free
 201                  * buffer as the component temp buffer (buffer switching
 202                  * saves an extra copy of the component text).
 203                  */
 204                 if ((cptr = wantcomp[CHASH(name)])) {
 205                     do {
 206                         if (!mh_strcasecmp(name, cptr->c_name)) {
 207                             if (! cptr->c_text) {
 208                                 cptr->c_text = tmpbuf;
 209                                 for (cp = tmpbuf + strlen (tmpbuf) - 1;
 210                                         cp >= tmpbuf; cp--)
 211                                     if (isspace (*cp))
 212                                         *cp = 0;
 213                                     else
 214                                         break;
 215                                 *--savecomp = cptr;
 216                                 tmpbuf = *nxtbuf++;
 217                             }
 218                             break;
 219                         }
 220                     } while ((cptr = cptr->c_next));
 221                 }
 222
 223                 while (state == FLDPLUS) {
 224                     state = m_getfld (state, name, tmpbuf, rlwidth, inb);
 225                     if (outnum)
 226                         FPUTS (tmpbuf);
 227                 }
 228                 break;
 229
 230             case BODY:
 231                 compnum = -1;
 232                 if (! outnum) {
 233                     state = FILEEOF; /* stop now if scan cmd */
 234                     goto finished;
 235                 }
 236                 if (putc ('\n', scnout) == EOF) DIEWRERR();
 237                 FPUTS (tmpbuf);
 238                 /*
 239                  * performance hack: some people like to run "inc" on
 240                  * things like net.sources or large digests.  We do a
 241                  * copy directly into the output buffer rather than
 242                  * going through an intermediate buffer.
 243                  *
 244                  * We need the amount of data m_getfld found & don't
 245                  * want to do a strlen on the long buffer so there's
 246                  * a hack in m_getfld to save the amount of data it
 247                  * returned in the global "msg_count".
 248                  */
 249 body:;
 250                 while (state == BODY) {
 251 #ifdef LINUX_STDIO
 252                     if (scnout->_IO_write_ptr == scnout->_IO_write_end) {
 253 #else
 254                     if (scnout->_cnt <= 0) {
 255 #endif
 256                         if (fflush(scnout) == EOF)
 257                             DIEWRERR ();
 258                     }
 259 #ifdef LINUX_STDIO
 260                     state = m_getfld(state, name, scnout->_IO_write_ptr,
 261                         (long)scnout->_IO_write_ptr-(long)scnout->_IO_write_end , inb);
 262                     scnout->_IO_write_ptr += msg_count;
 263 #else
 264                     state = m_getfld( state, name, scnout->_ptr, -(scnout->_cnt), inb );
 265                     scnout->_cnt -= msg_count;
 266                     scnout->_ptr += msg_count;
 267 #endif
 268                 }
 269                 goto finished;
 270
 271             case LENERR:
 272             case FMTERR:
 273                 fprintf (stderr,
 274                         innum ? "??Format error (message %d) in "
 275                               : "??Format error in ",
 276                         outnum ? outnum : innum);
 277                 fprintf (stderr, "component %d\n", compnum);
 278
 279                 if (outnum) {
 280                     FPUTS ("\n\nBAD MSG:\n");
 281                     FPUTS (name);
 282                     if (putc ('\n', scnout) == EOF) DIEWRERR();
 283                     state = BODY;
 284                     goto body;
 285                 }
 286                 /* fall through */
 287
 288             case FILEEOF:
 289                 goto finished;
 290
 291             default:
 292                 adios (NULL, "getfld() returned %d", state);
 293         }
 294     }
 295
 296     /*
 297      * format and output the scan line.
 298      */
 299 finished:
 300     if (ferror(inb)) {
 301         advise("read", "unable to"); /* "read error" */
 302         return SCNFAT;
 303     }
 304
 305     /* Save and restore buffer so we don't trash our dynamic pool! */
 306     if (bodycomp) {
 307         saved_c_text = bodycomp->c_text;
 308         bodycomp->c_text = tmpbuf;
 309     }
 310
 311     if (size)
 312         dat[2] = size;
 313     else if (outnum > 0)
 314     {
 315         dat[2] = ftell(scnout);
 316         if (dat[2] == EOF) DIEWRERR();
 317     }
 318
 319     if ((datecomp && !datecomp->c_text) || (!size && !outnum)) {
 320         struct stat st;
 321
 322         fstat (fileno(inb), &st);
 323         if (!size && !outnum)
 324             dat[2] = st.st_size;
 325         if (datecomp) {
 326             if (! datecomp->c_text) {
 327                 if (datecomp->c_tws == NULL)
 328                     datecomp->c_tws = (struct tws *)
 329                         calloc((size_t) 1, sizeof(*datecomp->c_tws));
 330                 if (datecomp->c_tws == NULL)
 331                     adios (NULL, "unable to allocate tws buffer");
 332                 *datecomp->c_tws = *dlocaltime ((time_t *) &st.st_mtime);
 333                 datecomp->c_flags |= CF_DATEFAB|CF_TRUE;
 334             } else {
 335                 datecomp->c_flags &= ~CF_DATEFAB;
 336             }
 337         }
 338     }
 339
 340     fmt_scan (fmt, scanl, slwidth, dat);
 341
 342 #if 0
 343     fmt = fmt_scan (fmt, scanl, slwidth, dat);
 344     if (!fmt)
 345         fmt = fmt_top;          /* reset for old format files */
 346 #endif
 347
 348     if (bodycomp)
 349         bodycomp->c_text = saved_c_text;
 350
 351     if (noisy)
 352         fputs (scanl, stdout);
 353
 354     FINDCOMP (cptr, "encrypted");
 355     encrypted = cptr && cptr->c_text;
 356
 357     /* return dynamically allocated buffers to pool */
 358     while ((cptr = *savecomp++)) {
 359         *--nxtbuf = cptr->c_text;
 360         cptr->c_text = NULL;
 361     }
 362     *--nxtbuf = tmpbuf;
 363
 364     if (outnum && (ferror(scnout) || fclose (scnout) == EOF))
 365         DIEWRERR();
 366
 367     return (state != FILEEOF ? SCNERR : encrypted ? SCNENC : SCNMSG);
 368 }
 369
 370
 371 /*
 372  * Cheat:  we are loaded with adrparse, which wants a routine called
 373  * OfficialName().  We call adrparse:getm() with the correct arguments
 374  * to prevent OfficialName() from being called.  Hence, the following
 375  * is to keep the loader happy.
 376  */
 377 char *
 378 OfficialName (char *name)
 379 {
 380     return name;
 381 }
 382
 383
 384 static int
 385 mh_fputs(char *s, FILE *stream)
 386 {
 387     char c;
 388
 389     while ((c = *s++))
 390         if (putc (c,stream) == EOF )
 391             return(EOF);
 392     return (0);
 393 }
 394