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

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