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 #ifdef RPATHS
  91     char returnpath[BUFSIZ];
  92     char deliverydate[BUFSIZ];
  93 #endif
  94
  95     /* first-time only initialization */
  96     if (!scanl) {
  97         if (width == 0) {
  98             if ((width = sc_width ()) < WIDTH/2)
  99                 width = WIDTH/2;
 100             else if (width > MAXSCANL)
 101                 width = MAXSCANL;
 102         }
 103         dat[3] = slwidth = width;
 104         scanl = (char *) mh_xmalloc((size_t) SCAN_CHARWIDTH * (slwidth + 2) );
 105         if (outnum)
 106             umask(~m_gmprot());
 107
 108         /* Compile format string */
 109         ncomps = fmt_compile (nfs, &fmt) + 1;
 110
 111 #ifdef JLR
 112         fmt_top = fmt;
 113 #endif  /* JLR */
 114         FINDCOMP(bodycomp, "body");
 115         FINDCOMP(datecomp, "date");
 116         FINDCOMP(cptr, "folder");
 117         if (cptr && folder)
 118             cptr->c_text = folder;
 119         FINDCOMP(cptr, "encrypted");
 120         if (!cptr)
 121             if ((cptr = (struct comp *) calloc (1, sizeof(*cptr)))) {
 122                 cptr->c_name = "encrypted";
 123                 cptr->c_next = wantcomp[i = CHASH (cptr->c_name)];
 124                 wantcomp[i] = cptr;
 125                 ncomps++;
 126         }
 127         FINDCOMP (cptr, "dtimenow");
 128         if (cptr)
 129             cptr->c_text = getcpy(dtimenow (0));
 130         nxtbuf = compbuffers = (char **) calloc((size_t) ncomps, sizeof(char *));
 131         if (nxtbuf == NULL)
 132             adios (NULL, "unable to allocate component buffers");
 133         used_buf = (struct comp **) calloc((size_t) (ncomps+1),
 134             sizeof(struct comp *));
 135         if (used_buf == NULL)
 136             adios (NULL, "unable to allocate component buffer stack");
 137         used_buf += ncomps+1; *--used_buf = 0;
 138         rlwidth = bodycomp && (width > SBUFSIZ) ? width : SBUFSIZ;
 139         for (i = ncomps; i--; )
 140             *nxtbuf++ = mh_xmalloc(rlwidth);
 141     }
 142
 143     /*
 144      * each-message initialization
 145      */
 146     nxtbuf = compbuffers;
 147     savecomp = used_buf;
 148     tmpbuf = *nxtbuf++;
 149     dat[0] = innum ? innum : outnum;
 150     dat[1] = curflg;
 151     dat[4] = unseen;
 152
 153     /*
 154      * Get the first field.  If the message is non-empty
 155      * and we're doing an "inc", open the output file.
 156      */
 157     if ((state = m_getfld (FLD, name, tmpbuf, rlwidth, inb)) == FILEEOF) {
 158         if (ferror(inb)) {
 159             advise("read", "unable to"); /* "read error" */
 160             return SCNFAT;
 161         } else {
 162             return SCNEOF;
 163         }
 164     }
 165
 166     if (outnum) {
 167         if (outnum > 0) {
 168             scnmsg = m_name (outnum);
 169             if (*scnmsg == '?')         /* msg num out of range */
 170                 return SCNNUM;
 171         } else {
 172             scnmsg = "/dev/null";
 173         }
 174         if ((scnout = fopen (scnmsg, "w")) == NULL)
 175             adios (scnmsg, "unable to write");
 176 #ifdef RPATHS
 177         /*
 178          * Add the Return-Path and Delivery-Date
 179          * header fields to message.
 180          */
 181         if (get_returnpath (returnpath, sizeof(returnpath),
 182                 deliverydate, sizeof(deliverydate))) {
 183             FPUTS ("Return-Path: ");
 184             FPUTS (returnpath);
 185             FPUTS ("Delivery-Date: ");
 186             FPUTS (deliverydate);
 187         }
 188 #endif /* RPATHS */
 189     }
 190
 191     /* scan - main loop */
 192     for (compnum = 1; ; state = m_getfld (state, name, tmpbuf, rlwidth, inb)) {
 193         switch (state) {
 194             case FLD:
 195             case FLDPLUS:
 196                 compnum++;
 197                 if (outnum) {
 198                     FPUTS (name);
 199                     if ( putc (':', scnout) == EOF) DIEWRERR();
 200                     FPUTS (tmpbuf);
 201                 }
 202                 /*
 203                  * if we're interested in this component, save a pointer
 204                  * to the component text, then start using our next free
 205                  * buffer as the component temp buffer (buffer switching
 206                  * saves an extra copy of the component text).
 207                  */
 208                 if ((cptr = wantcomp[CHASH(name)])) {
 209                     do {
 210                         if (!mh_strcasecmp(name, cptr->c_name)) {
 211                             if (! cptr->c_text) {
 212                                 cptr->c_text = tmpbuf;
 213                                 for (cp = tmpbuf + strlen (tmpbuf) - 1;
 214                                         cp >= tmpbuf; cp--)
 215                                     if (isspace (*cp))
 216                                         *cp = 0;
 217                                     else
 218                                         break;
 219                                 *--savecomp = cptr;
 220                                 tmpbuf = *nxtbuf++;
 221                             }
 222                             break;
 223                         }
 224                     } while ((cptr = cptr->c_next));
 225                 }
 226
 227                 while (state == FLDPLUS) {
 228                     state = m_getfld (state, name, tmpbuf, rlwidth, inb);
 229                     if (outnum)
 230                         FPUTS (tmpbuf);
 231                 }
 232                 break;
 233
 234             case BODY:
 235                 compnum = -1;
 236                 if (! outnum) {
 237                     state = FILEEOF; /* stop now if scan cmd */
 238                     goto finished;
 239                 }
 240                 if (putc ('\n', scnout) == EOF) DIEWRERR();
 241                 FPUTS (tmpbuf);
 242                 /*
 243                  * performance hack: some people like to run "inc" on
 244                  * things like net.sources or large digests.  We do a
 245                  * copy directly into the output buffer rather than
 246                  * going through an intermediate buffer.
 247                  *
 248                  * We need the amount of data m_getfld found & don't
 249                  * want to do a strlen on the long buffer so there's
 250                  * a hack in m_getfld to save the amount of data it
 251                  * returned in the global "msg_count".
 252                  */
 253 body:;
 254                 while (state == BODY) {
 255 #ifdef LINUX_STDIO
 256                     if (scnout->_IO_write_ptr == scnout->_IO_write_end) {
 257 #elif defined(__DragonFly__)
 258                     if (((struct __FILE_public *)scnout)->_w <= 0) {
 259 #else
 260                     if (scnout->_cnt <= 0) {
 261 #endif
 262                         if (fflush(scnout) == EOF)
 263                             DIEWRERR ();
 264                     }
 265 #ifdef LINUX_STDIO
 266                     state = m_getfld(state, name, scnout->_IO_write_ptr,
 267                         (long)scnout->_IO_write_ptr-(long)scnout->_IO_write_end , inb);
 268                     scnout->_IO_write_ptr += msg_count;
 269 #elif defined(__DragonFly__)
 270                     state = m_getfld( state, name, ((struct __FILE_public *)scnout)->_p, -(((struct __FILE_public *)scnout)->_w), inb );
 271                     ((struct __FILE_public *)scnout)->_w -= msg_count;
 272                     ((struct __FILE_public *)scnout)->_p += msg_count;
 273 #else
 274                     state = m_getfld( state, name, scnout->_ptr, -(scnout->_cnt), inb );
 275                     scnout->_cnt -= msg_count;
 276                     scnout->_ptr += msg_count;
 277 #endif
 278                 }
 279                 goto finished;
 280
 281             case LENERR:
 282             case FMTERR:
 283                 fprintf (stderr,
 284                         innum ? "??Format error (message %d) in "
 285                               : "??Format error in ",
 286                         outnum ? outnum : innum);
 287                 fprintf (stderr, "component %d\n", compnum);
 288
 289                 if (outnum) {
 290                     FPUTS ("\n\nBAD MSG:\n");
 291                     FPUTS (name);
 292                     if (putc ('\n', scnout) == EOF) DIEWRERR();
 293                     state = BODY;
 294                     goto body;
 295                 }
 296                 /* fall through */
 297
 298             case FILEEOF:
 299                 goto finished;
 300
 301             default:
 302                 adios (NULL, "getfld() returned %d", state);
 303         }
 304     }
 305
 306     /*
 307      * format and output the scan line.
 308      */
 309 finished:
 310     if (ferror(inb)) {
 311         advise("read", "unable to"); /* "read error" */
 312         return SCNFAT;
 313     }
 314
 315     /* Save and restore buffer so we don't trash our dynamic pool! */
 316     if (bodycomp) {
 317         saved_c_text = bodycomp->c_text;
 318         bodycomp->c_text = tmpbuf;
 319     }
 320
 321     if (size)
 322         dat[2] = size;
 323     else if (outnum > 0)
 324     {
 325         dat[2] = ftell(scnout);
 326         if (dat[2] == EOF) DIEWRERR();
 327     }
 328
 329     if ((datecomp && !datecomp->c_text) || (!size && !outnum)) {
 330         struct stat st;
 331
 332         fstat (fileno(inb), &st);
 333         if (!size && !outnum)
 334             dat[2] = st.st_size;
 335         if (datecomp) {
 336             if (! datecomp->c_text) {
 337                 if (datecomp->c_tws == NULL)
 338                     datecomp->c_tws = (struct tws *)
 339                         calloc((size_t) 1, sizeof(*datecomp->c_tws));
 340                 if (datecomp->c_tws == NULL)
 341                     adios (NULL, "unable to allocate tws buffer");
 342                 *datecomp->c_tws = *dlocaltime ((time_t *) &st.st_mtime);
 343                 datecomp->c_flags |= CF_DATEFAB|CF_TRUE;
 344             } else {
 345                 datecomp->c_flags &= ~CF_DATEFAB;
 346             }
 347         }
 348     }
 349
 350     fmt_scan (fmt, scanl, slwidth, dat);
 351
 352 #if 0
 353     fmt = fmt_scan (fmt, scanl, slwidth, dat);
 354     if (!fmt)
 355         fmt = fmt_top;          /* reset for old format files */
 356 #endif
 357
 358     if (bodycomp)
 359         bodycomp->c_text = saved_c_text;
 360
 361     if (noisy)
 362         fputs (scanl, stdout);
 363
 364     FINDCOMP (cptr, "encrypted");
 365     encrypted = cptr && cptr->c_text;
 366
 367     /* return dynamically allocated buffers to pool */
 368     while ((cptr = *savecomp++)) {
 369         *--nxtbuf = cptr->c_text;
 370         cptr->c_text = NULL;
 371     }
 372     *--nxtbuf = tmpbuf;
 373
 374     if (outnum && (ferror(scnout) || fclose (scnout) == EOF))
 375         DIEWRERR();
 376
 377     return (state != FILEEOF ? SCNERR : encrypted ? SCNENC : SCNMSG);
 378 }
 379
 380
 381 /*
 382  * Cheat:  we are loaded with adrparse, which wants a routine called
 383  * OfficialName().  We call adrparse:getm() with the correct arguments
 384  * to prevent OfficialName() from being called.  Hence, the following
 385  * is to keep the loader happy.
 386  */
 387 char *
 388 OfficialName (char *name)
 389 {
 390     return name;
 391 }
 392
 393
 394 static int
 395 mh_fputs(char *s, FILE *stream)
 396 {
 397     char c;
 398
 399     while ((c = *s++))
 400         if (putc (c,stream) == EOF )
 401             return(EOF);
 402     return (0);
 403 }
 404