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
  18 #ifdef _FSTDIO
  19 # define _ptr _p                /* Gag    */
  20 # define _cnt _w                /* Wretch */
  21 #endif
  22
  23 #ifdef SCO_5_STDIO
  24 # define _ptr  __ptr
  25 # define _cnt  __cnt
  26 # define _base __base
  27 # define _filbuf(fp)  ((fp)->__cnt = 0, __filbuf(fp))
  28 #endif
  29
  30 #define MAXSCANL 256            /* longest possible scan line */
  31
  32 /*
  33  * Buffer size for content part of header fields.  We want this
  34  * to be large enough so that we don't do a lot of extra FLDPLUS
  35  * calls on m_getfld but small enough so that we don't snarf
  36  * the entire message body when we're only going to display 30
  37  * characters of it.
  38  */
  39 #define SBUFSIZ 512
  40
  41 static struct format *fmt;
  42 #ifdef JLR
  43 static struct format *fmt_top;
  44 #endif /* JLR */
  45
  46 static struct comp *datecomp;           /* pntr to "date" comp             */
  47 static struct comp *bodycomp;           /* pntr to "body" pseudo-comp      *
  48                                          * (if referenced)                 */
  49 static int ncomps = 0;                  /* # of interesting components     */
  50 static char **compbuffers = 0;          /* buffers for component text      */
  51 static struct comp **used_buf = 0;      /* stack for comp that use buffers */
  52
  53 static int dat[5];                      /* aux. data for format routine    */
  54
  55 char *scanl = 0;                        /* text of most recent scanline    */
  56
  57 #define DIEWRERR() adios (scnmsg, "write error on")
  58
  59 #define FPUTS(buf) {\
  60                 if (mh_fputs(buf,scnout) == EOF)\
  61                     DIEWRERR();\
  62                 }
  63
  64 /*
  65  * prototypes
  66  */
  67 int sc_width (void);                    /* from termsbr.c */
  68 static int mh_fputs(char *, FILE *);
  69
  70
  71 int
  72 scan (FILE *inb, int innum, int outnum, char *nfs, int width, int curflg,
  73       int unseen, char *folder, long size, int noisy)
  74 {
  75     int i, compnum, encrypted, state;
  76     char *cp, *tmpbuf, **nxtbuf;
  77     char *saved_c_text;
  78     struct comp *cptr;
  79     struct comp **savecomp;
  80     char *scnmsg;
  81     FILE *scnout;
  82     char name[NAMESZ];
  83     static int rlwidth, slwidth;
  84
  85 #ifdef RPATHS
  86     char returnpath[BUFSIZ];
  87     char deliverydate[BUFSIZ];
  88 #endif
  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         if ((scanl = (char *) malloc((size_t) (slwidth + 2) )) == NULL)
 100             adios (NULL, "unable to malloc scan line (%d bytes)", 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             if ((*nxtbuf++ = malloc(rlwidth)) == NULL)
 137                 adios (NULL, "unable to allocate component buffer");
 138     }
 139
 140     /*
 141      * each-message initialization
 142      */
 143     nxtbuf = compbuffers;
 144     savecomp = used_buf;
 145     tmpbuf = *nxtbuf++;
 146     dat[0] = innum ? innum : outnum;
 147     dat[1] = curflg;
 148     dat[4] = unseen;
 149
 150     /*
 151      * Get the first field.  If the message is non-empty
 152      * and we're doing an "inc", open the output file.
 153      */
 154     if ((state = m_getfld (FLD, name, tmpbuf, rlwidth, inb)) == FILEEOF) {
 155         if (ferror(inb)) {
 156             advise("read", "unable to"); /* "read error" */
 157             return SCNFAT;
 158         } else {
 159             return SCNEOF;
 160         }
 161     }
 162
 163     if (outnum) {
 164         if (outnum > 0) {
 165             scnmsg = m_name (outnum);
 166             if (*scnmsg == '?')         /* msg num out of range */
 167                 return SCNNUM;
 168         } else {
 169             scnmsg = "/dev/null";
 170         }
 171         if ((scnout = fopen (scnmsg, "w")) == NULL)
 172             adios (scnmsg, "unable to write");
 173 #ifdef RPATHS
 174         /*
 175          * Add the Return-Path and Delivery-Date
 176          * header fields to message.
 177          */
 178         if (get_returnpath (returnpath, sizeof(returnpath),
 179                 deliverydate, sizeof(deliverydate))) {
 180             FPUTS ("Return-Path: ");
 181             FPUTS (returnpath);
 182             FPUTS ("Delivery-Date: ");
 183             FPUTS (deliverydate);
 184         }
 185 #endif /* RPATHS */
 186     }
 187
 188     /* scan - main loop */
 189     for (compnum = 1; ; state = m_getfld (state, name, tmpbuf, rlwidth, inb)) {
 190         switch (state) {
 191             case FLD:
 192             case FLDPLUS:
 193                 compnum++;
 194                 if (outnum) {
 195                     FPUTS (name);
 196                     if ( putc (':', scnout) == EOF) DIEWRERR();
 197                     FPUTS (tmpbuf);
 198                 }
 199                 /*
 200                  * if we're interested in this component, save a pointer
 201                  * to the component text, then start using our next free
 202                  * buffer as the component temp buffer (buffer switching
 203                  * saves an extra copy of the component text).
 204                  */
 205                 if ((cptr = wantcomp[CHASH(name)])) {
 206                     do {
 207                         if (!strcasecmp(name, cptr->c_name)) {
 208                             if (! cptr->c_text) {
 209                                 cptr->c_text = tmpbuf;
 210                                 for (cp = tmpbuf + strlen (tmpbuf) - 1;
 211                                         cp >= tmpbuf; cp--)
 212                                     if (isspace (*cp))
 213                                         *cp = 0;
 214                                     else
 215                                         break;
 216                                 *--savecomp = cptr;
 217                                 tmpbuf = *nxtbuf++;
 218                             }
 219                             break;
 220                         }
 221                     } while ((cptr = cptr->c_next));
 222                 }
 223
 224                 while (state == FLDPLUS) {
 225                     state = m_getfld (state, name, tmpbuf, rlwidth, inb);
 226                     if (outnum)
 227                         FPUTS (tmpbuf);
 228                 }
 229                 break;
 230
 231             case BODY:
 232                 compnum = -1;
 233                 if (! outnum) {
 234                     state = FILEEOF; /* stop now if scan cmd */
 235                     goto finished;
 236                 }
 237                 if (putc ('\n', scnout) == EOF) DIEWRERR();
 238                 FPUTS (tmpbuf);
 239                 /*
 240                  * performance hack: some people like to run "inc" on
 241                  * things like net.sources or large digests.  We do a
 242                  * copy directly into the output buffer rather than
 243                  * going through an intermediate buffer.
 244                  *
 245                  * We need the amount of data m_getfld found & don't
 246                  * want to do a strlen on the long buffer so there's
 247                  * a hack in m_getfld to save the amount of data it
 248                  * returned in the global "msg_count".
 249                  */
 250 body:;
 251                 while (state == BODY) {
 252 #ifdef LINUX_STDIO
 253                     if (scnout->_IO_write_ptr == scnout->_IO_write_end) {
 254 #else
 255                     if (scnout->_cnt <= 0) {
 256 #endif
 257                         if (fflush(scnout) == EOF)
 258                             DIEWRERR ();
 259                     }
 260 #ifdef LINUX_STDIO
 261                     state = m_getfld(state, name, scnout->_IO_write_ptr,
 262                         (long)scnout->_IO_write_ptr-(long)scnout->_IO_write_end , inb);
 263                     scnout->_IO_write_ptr += msg_count;
 264 #else
 265                     state = m_getfld( state, name, scnout->_ptr, -(scnout->_cnt), inb );
 266                     scnout->_cnt -= msg_count;
 267                     scnout->_ptr += msg_count;
 268 #endif
 269                 }
 270                 goto finished;
 271
 272             case LENERR:
 273             case FMTERR:
 274                 fprintf (stderr,
 275                         innum ? "??Format error (message %d) in "
 276                               : "??Format error in ",
 277                         outnum ? outnum : innum);
 278                 fprintf (stderr, "component %d\n", compnum);
 279
 280                 if (outnum) {
 281                     FPUTS ("\n\nBAD MSG:\n");
 282                     FPUTS (name);
 283                     if (putc ('\n', scnout) == EOF) DIEWRERR();
 284                     state = BODY;
 285                     goto body;
 286                 }
 287                 /* fall through */
 288
 289             case FILEEOF:
 290                 goto finished;
 291
 292             default:
 293                 adios (NULL, "getfld() returned %d", state);
 294         }
 295     }
 296
 297     /*
 298      * format and output the scan line.
 299      */
 300 finished:
 301     if (ferror(inb)) {
 302         advise("read", "unable to"); /* "read error" */
 303         return SCNFAT;
 304     }
 305
 306     /* Save and restore buffer so we don't trash our dynamic pool! */
 307     if (bodycomp) {
 308         saved_c_text = bodycomp->c_text;
 309         bodycomp->c_text = tmpbuf;
 310     }
 311
 312     if (size)
 313         dat[2] = size;
 314     else if (outnum > 0)
 315     {
 316         dat[2] = ftell(scnout);
 317         if (dat[2] == EOF) DIEWRERR();
 318     }
 319
 320     if ((datecomp && !datecomp->c_text) || (!size && !outnum)) {
 321         struct stat st;
 322
 323         fstat (fileno(inb), &st);
 324         if (!size && !outnum)
 325             dat[2] = st.st_size;
 326         if (datecomp) {
 327             if (! datecomp->c_text) {
 328                 if (datecomp->c_tws == NULL)
 329                     datecomp->c_tws = (struct tws *)
 330                         calloc((size_t) 1, sizeof(*datecomp->c_tws));
 331                 if (datecomp->c_tws == NULL)
 332                     adios (NULL, "unable to allocate tws buffer");
 333                 *datecomp->c_tws = *dlocaltime ((time_t *) &st.st_mtime);
 334                 datecomp->c_flags |= CF_DATEFAB|CF_TRUE;
 335             } else {
 336                 datecomp->c_flags &= ~CF_DATEFAB;
 337             }
 338         }
 339     }
 340
 341     fmt_scan (fmt, scanl, slwidth, dat);
 342
 343 #if 0
 344     fmt = fmt_scan (fmt, scanl, slwidth, dat);
 345     if (!fmt)
 346         fmt = fmt_top;          /* reset for old format files */
 347 #endif
 348
 349     if (bodycomp)
 350         bodycomp->c_text = saved_c_text;
 351
 352     if (noisy)
 353         fputs (scanl, stdout);
 354
 355     FINDCOMP (cptr, "encrypted");
 356     encrypted = cptr && cptr->c_text;
 357
 358     /* return dynamically allocated buffers to pool */
 359     while ((cptr = *savecomp++)) {
 360         *--nxtbuf = cptr->c_text;
 361         cptr->c_text = NULL;
 362     }
 363     *--nxtbuf = tmpbuf;
 364
 365     if (outnum && (ferror(scnout) || fclose (scnout) == EOF))
 366         DIEWRERR();
 367
 368     return (state != FILEEOF ? SCNERR : encrypted ? SCNENC : SCNMSG);
 369 }
 370
 371
 372 /*
 373  * Cheat:  we are loaded with adrparse, which wants a routine called
 374  * OfficialName().  We call adrparse:getm() with the correct arguments
 375  * to prevent OfficialName() from being called.  Hence, the following
 376  * is to keep the loader happy.
 377  */
 378 char *
 379 OfficialName (char *name)
 380 {
 381     return name;
 382 }
 383
 384
 385 static int
 386 mh_fputs(char *s, FILE *stream)
 387 {
 388     char c;
 389
 390     while ((c = *s++))
 391         if (putc (c,stream) == EOF )
 392             return(EOF);
 393     return (0);
 394 }
 395