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