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 #ifdef MULTIBYTE_SUPPORT
  72 #define SCAN_CHARWIDTH MB_CUR_MAX
  73 #else
  74 #define SCAN_CHARWIDTH 1
  75 #endif
  76
  77 int
  78 scan (FILE *inb, int innum, int outnum, char *nfs, int width, int curflg,
  79       int unseen, char *folder, long size, int noisy)
  80 {
  81     int i, compnum, encrypted, state;
  82     unsigned char *cp, *tmpbuf;
  83     char **nxtbuf;
  84     char *saved_c_text;
  85     struct comp *cptr;
  86     struct comp **savecomp;
  87     char *scnmsg;
  88     FILE *scnout;
  89     char name[NAMESZ];
  90     static int rlwidth, slwidth;
  91
  92 #ifdef RPATHS
  93     char returnpath[BUFSIZ];
  94     char deliverydate[BUFSIZ];
  95 #endif
  96
  97     /* first-time only initialization */
  98     if (!scanl) {
  99         if (width == 0) {
 100             if ((width = sc_width ()) < WIDTH/2)
 101                 width = WIDTH/2;
 102             else if (width > MAXSCANL)
 103                 width = MAXSCANL;
 104         }
 105         dat[3] = slwidth = width;
 106         scanl = (char *) mh_xmalloc((size_t) SCAN_CHARWIDTH * (slwidth + 2) );
 107         if (outnum)
 108             umask(~m_gmprot());
 109
 110         /* Compile format string */
 111         ncomps = fmt_compile (nfs, &fmt) + 1;
 112
 113 #ifdef JLR
 114         fmt_top = fmt;
 115 #endif  /* JLR */
 116         FINDCOMP(bodycomp, "body");
 117         FINDCOMP(datecomp, "date");
 118         FINDCOMP(cptr, "folder");
 119         if (cptr && folder)
 120             cptr->c_text = folder;
 121         FINDCOMP(cptr, "encrypted");
 122         if (!cptr)
 123             if ((cptr = (struct comp *) calloc (1, sizeof(*cptr)))) {
 124                 cptr->c_name = "encrypted";
 125                 cptr->c_next = wantcomp[i = CHASH (cptr->c_name)];
 126                 wantcomp[i] = cptr;
 127                 ncomps++;
 128         }
 129         FINDCOMP (cptr, "dtimenow");
 130         if (cptr)
 131             cptr->c_text = getcpy(dtimenow (0));
 132         nxtbuf = compbuffers = (char **) calloc((size_t) ncomps, sizeof(char *));
 133         if (nxtbuf == NULL)
 134             adios (NULL, "unable to allocate component buffers");
 135         used_buf = (struct comp **) calloc((size_t) (ncomps+1),
 136             sizeof(struct comp *));
 137         if (used_buf == NULL)
 138             adios (NULL, "unable to allocate component buffer stack");
 139         used_buf += ncomps+1; *--used_buf = 0;
 140         rlwidth = bodycomp && (width > SBUFSIZ) ? width : SBUFSIZ;
 141         for (i = ncomps; i--; )
 142             *nxtbuf++ = mh_xmalloc(rlwidth);
 143     }
 144
 145     /*
 146      * each-message initialization
 147      */
 148     nxtbuf = compbuffers;
 149     savecomp = used_buf;
 150     tmpbuf = *nxtbuf++;
 151     dat[0] = innum ? innum : outnum;
 152     dat[1] = curflg;
 153     dat[4] = unseen;
 154
 155     /*
 156      * Get the first field.  If the message is non-empty
 157      * and we're doing an "inc", open the output file.
 158      */
 159     if ((state = m_getfld (FLD, name, tmpbuf, rlwidth, inb)) == FILEEOF) {
 160         if (ferror(inb)) {
 161             advise("read", "unable to"); /* "read error" */
 162             return SCNFAT;
 163         } else {
 164             return SCNEOF;
 165         }
 166     }
 167
 168     if (outnum) {
 169         if (outnum > 0) {
 170             scnmsg = m_name (outnum);
 171             if (*scnmsg == '?')         /* msg num out of range */
 172                 return SCNNUM;
 173         } else {
 174             scnmsg = "/dev/null";
 175         }
 176         if ((scnout = fopen (scnmsg, "w")) == NULL)
 177             adios (scnmsg, "unable to write");
 178 #ifdef RPATHS
 179         /*
 180          * Add the Return-Path and Delivery-Date
 181          * header fields to message.
 182          */
 183         if (get_returnpath (returnpath, sizeof(returnpath),
 184                 deliverydate, sizeof(deliverydate))) {
 185             FPUTS ("Return-Path: ");
 186             FPUTS (returnpath);
 187             FPUTS ("Delivery-Date: ");
 188             FPUTS (deliverydate);
 189         }
 190 #endif /* RPATHS */
 191     }
 192
 193     /* scan - main loop */
 194     for (compnum = 1; ; state = m_getfld (state, name, tmpbuf, rlwidth, inb)) {
 195         switch (state) {
 196             case FLD:
 197             case FLDPLUS:
 198                 compnum++;
 199                 if (outnum) {
 200                     FPUTS (name);
 201                     if ( putc (':', scnout) == EOF) DIEWRERR();
 202                     FPUTS (tmpbuf);
 203                 }
 204                 /*
 205                  * if we're interested in this component, save a pointer
 206                  * to the component text, then start using our next free
 207                  * buffer as the component temp buffer (buffer switching
 208                  * saves an extra copy of the component text).
 209                  */
 210                 if ((cptr = wantcomp[CHASH(name)])) {
 211                     do {
 212                         if (!mh_strcasecmp(name, cptr->c_name)) {
 213                             if (! cptr->c_text) {
 214                                 cptr->c_text = tmpbuf;
 215                                 for (cp = tmpbuf + strlen (tmpbuf) - 1;
 216                                         cp >= tmpbuf; cp--)
 217                                     if (isspace (*cp))
 218                                         *cp = 0;
 219                                     else
 220                                         break;
 221                                 *--savecomp = cptr;
 222                                 tmpbuf = *nxtbuf++;
 223                             }
 224                             break;
 225                         }
 226                     } while ((cptr = cptr->c_next));
 227                 }
 228
 229                 while (state == FLDPLUS) {
 230                     state = m_getfld (state, name, tmpbuf, rlwidth, inb);
 231                     if (outnum)
 232                         FPUTS (tmpbuf);
 233                 }
 234                 break;
 235
 236             case BODY:
 237                 compnum = -1;
 238                 if (! outnum) {
 239                     state = FILEEOF; /* stop now if scan cmd */
 240                     goto finished;
 241                 }
 242                 if (putc ('\n', scnout) == EOF) DIEWRERR();
 243                 FPUTS (tmpbuf);
 244                 /*
 245                  * performance hack: some people like to run "inc" on
 246                  * things like net.sources or large digests.  We do a
 247                  * copy directly into the output buffer rather than
 248                  * going through an intermediate buffer.
 249                  *
 250                  * We need the amount of data m_getfld found & don't
 251                  * want to do a strlen on the long buffer so there's
 252                  * a hack in m_getfld to save the amount of data it
 253                  * returned in the global "msg_count".
 254                  */
 255 body:;
 256                 while (state == BODY) {
 257 #ifdef LINUX_STDIO
 258                     if (scnout->_IO_write_ptr == scnout->_IO_write_end) {
 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 #else
 270                     state = m_getfld( state, name, scnout->_ptr, -(scnout->_cnt), inb );
 271                     scnout->_cnt -= msg_count;
 272                     scnout->_ptr += msg_count;
 273 #endif
 274                 }
 275                 goto finished;
 276
 277             case LENERR:
 278             case FMTERR:
 279                 fprintf (stderr,
 280                         innum ? "??Format error (message %d) in "
 281                               : "??Format error in ",
 282                         outnum ? outnum : innum);
 283                 fprintf (stderr, "component %d\n", compnum);
 284
 285                 if (outnum) {
 286                     FPUTS ("\n\nBAD MSG:\n");
 287                     FPUTS (name);
 288                     if (putc ('\n', scnout) == EOF) DIEWRERR();
 289                     state = BODY;
 290                     goto body;
 291                 }
 292                 /* fall through */
 293
 294             case FILEEOF:
 295                 goto finished;
 296
 297             default:
 298                 adios (NULL, "getfld() returned %d", state);
 299         }
 300     }
 301
 302     /*
 303      * format and output the scan line.
 304      */
 305 finished:
 306     if (ferror(inb)) {
 307         advise("read", "unable to"); /* "read error" */
 308         return SCNFAT;
 309     }
 310
 311     /* Save and restore buffer so we don't trash our dynamic pool! */
 312     if (bodycomp) {
 313         saved_c_text = bodycomp->c_text;
 314         bodycomp->c_text = tmpbuf;
 315     }
 316
 317     if (size)
 318         dat[2] = size;
 319     else if (outnum > 0)
 320     {
 321         dat[2] = ftell(scnout);
 322         if (dat[2] == EOF) DIEWRERR();
 323     }
 324
 325     if ((datecomp && !datecomp->c_text) || (!size && !outnum)) {
 326         struct stat st;
 327
 328         fstat (fileno(inb), &st);
 329         if (!size && !outnum)
 330             dat[2] = st.st_size;
 331         if (datecomp) {
 332             if (! datecomp->c_text) {
 333                 if (datecomp->c_tws == NULL)
 334                     datecomp->c_tws = (struct tws *)
 335                         calloc((size_t) 1, sizeof(*datecomp->c_tws));
 336                 if (datecomp->c_tws == NULL)
 337                     adios (NULL, "unable to allocate tws buffer");
 338                 *datecomp->c_tws = *dlocaltime ((time_t *) &st.st_mtime);
 339                 datecomp->c_flags |= CF_DATEFAB|CF_TRUE;
 340             } else {
 341                 datecomp->c_flags &= ~CF_DATEFAB;
 342             }
 343         }
 344     }
 345
 346     fmt_scan (fmt, scanl, slwidth, dat);
 347
 348 #if 0
 349     fmt = fmt_scan (fmt, scanl, slwidth, dat);
 350     if (!fmt)
 351         fmt = fmt_top;          /* reset for old format files */
 352 #endif
 353
 354     if (bodycomp)
 355         bodycomp->c_text = saved_c_text;
 356
 357     if (noisy)
 358         fputs (scanl, stdout);
 359
 360     FINDCOMP (cptr, "encrypted");
 361     encrypted = cptr && cptr->c_text;
 362
 363     /* return dynamically allocated buffers to pool */
 364     while ((cptr = *savecomp++)) {
 365         *--nxtbuf = cptr->c_text;
 366         cptr->c_text = NULL;
 367     }
 368     *--nxtbuf = tmpbuf;
 369
 370     if (outnum && (ferror(scnout) || fclose (scnout) == EOF))
 371         DIEWRERR();
 372
 373     return (state != FILEEOF ? SCNERR : encrypted ? SCNENC : SCNMSG);
 374 }
 375
 376
 377 /*
 378  * Cheat:  we are loaded with adrparse, which wants a routine called
 379  * OfficialName().  We call adrparse:getm() with the correct arguments
 380  * to prevent OfficialName() from being called.  Hence, the following
 381  * is to keep the loader happy.
 382  */
 383 char *
 384 OfficialName (char *name)
 385 {
 386     return name;
 387 }
 388
 389
 390 static int
 391 mh_fputs(char *s, FILE *stream)
 392 {
 393     char c;
 394
 395     while ((c = *s++))
 396         if (putc (c,stream) == EOF )
 397             return(EOF);
 398     return (0);
 399 }
 400