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

   1
   2 /*
   3  * scansbr.c -- routines to help scan along...
   4  *
   5  * $Id$
   6  */
   7
   8 #include <h/mh.h>
   9 #include <h/addrsbr.h>
  10 #include <h/fmt_scan.h>
  11 #include <h/scansbr.h>
  12 #include <zotnet/tws/tws.h>
  13
  14 #ifdef _FSTDIO
  15 # define _ptr _p                /* Gag    */
  16 # define _cnt _w                /* Wretch */
  17 #endif
  18
  19 #ifdef SCO_5_STDIO
  20 # define _ptr  __ptr
  21 # define _cnt  __cnt
  22 # define _base __base
  23 # define _filbuf(fp)  ((fp)->__cnt = 0, __filbuf(fp))
  24 #endif
  25
  26 #define MAXSCANL 256            /* longest possible scan line */
  27
  28 /*
  29  * Buffer size for content part of header fields.  We want this
  30  * to be large enough so that we don't do a lot of extra FLDPLUS
  31  * calls on m_getfld but small enough so that we don't snarf
  32  * the entire message body when we're only going to display 30
  33  * characters of it.
  34  */
  35 #define SBUFSIZ 512
  36
  37 static struct format *fmt;
  38 #ifdef JLR
  39 static struct format *fmt_top;
  40 #endif /* JLR */
  41
  42 static struct comp *datecomp;           /* pntr to "date" comp             */
  43 static struct comp *bodycomp;           /* pntr to "body" pseudo-comp      *
  44                                          * (if referenced)                 */
  45 static int ncomps = 0;                  /* # of interesting components     */
  46 static char **compbuffers = 0;          /* buffers for component text      */
  47 static struct comp **used_buf = 0;      /* stack for comp that use buffers */
  48
  49 static int dat[5];                      /* aux. data for format routine    */
  50
  51 char *scanl = 0;                        /* text of most recent scanline    */
  52
  53 #define FPUTS(buf) {\
  54                 if (mh_fputs(buf,scnout) == EOF)\
  55                     adios (scnmsg, "write error on");\
  56                 }
  57
  58 /*
  59  * prototypes
  60  */
  61 int sc_width (void);                    /* from termsbr.c */
  62 static int mh_fputs(char *, FILE *);
  63
  64
  65 int
  66 scan (FILE *inb, int innum, int outnum, char *nfs, int width, int curflg,
  67       int unseen, char *folder, long size, int noisy)
  68 {
  69     int i, compnum, encrypted, state;
  70     char *cp, *tmpbuf, **nxtbuf;
  71     char *saved_c_text;
  72     struct comp *cptr;
  73     struct comp **savecomp;
  74     char *scnmsg;
  75     FILE *scnout;
  76     char name[NAMESZ];
  77     static int rlwidth, slwidth;
  78
  79 #ifdef RPATHS
  80     char returnpath[BUFSIZ];
  81     char deliverydate[BUFSIZ];
  82 #endif
  83
  84     /* first-time only initialization */
  85     if (!scanl) {
  86         if (width == 0) {
  87             if ((width = sc_width ()) < WIDTH/2)
  88                 width = WIDTH/2;
  89             else if (width > MAXSCANL)
  90                 width = MAXSCANL;
  91         }
  92         dat[3] = slwidth = width;
  93         if ((scanl = (char *) malloc((size_t) (slwidth + 2) )) == NULL)
  94             adios (NULL, "unable to malloc scan line (%d bytes)", slwidth+2);
  95         if (outnum)
  96             umask(~m_gmprot());
  97
  98         /* Compile format string */
  99         ncomps = fmt_compile (nfs, &fmt) + 1;
 100
 101 #ifdef JLR
 102         fmt_top = fmt;
 103 #endif  /* JLR */
 104         FINDCOMP(bodycomp, "body");
 105         FINDCOMP(datecomp, "date");
 106         FINDCOMP(cptr, "folder");
 107         if (cptr && folder)
 108             cptr->c_text = folder;
 109         FINDCOMP(cptr, "encrypted");
 110         if (!cptr)
 111             if ((cptr = (struct comp *) calloc (1, sizeof(*cptr)))) {
 112                 cptr->c_name = "encrypted";
 113                 cptr->c_next = wantcomp[i = CHASH (cptr->c_name)];
 114                 wantcomp[i] = cptr;
 115                 ncomps++;
 116         }
 117         FINDCOMP (cptr, "dtimenow");
 118         if (cptr)
 119             cptr->c_text = getcpy(dtimenow (0));
 120         nxtbuf = compbuffers = (char **) calloc((size_t) ncomps, sizeof(char *));
 121         if (nxtbuf == NULL)
 122             adios (NULL, "unable to allocate component buffers");
 123         used_buf = (struct comp **) calloc((size_t) (ncomps+1),
 124             sizeof(struct comp *));
 125         if (used_buf == NULL)
 126             adios (NULL, "unable to allocate component buffer stack");
 127         used_buf += ncomps+1; *--used_buf = 0;
 128         rlwidth = bodycomp && (width > SBUFSIZ) ? width : SBUFSIZ;
 129         for (i = ncomps; i--; )
 130             if ((*nxtbuf++ = malloc(rlwidth)) == NULL)
 131                 adios (NULL, "unable to allocate component buffer");
 132     }
 133
 134     /*
 135      * each-message initialization
 136      */
 137     nxtbuf = compbuffers;
 138     savecomp = used_buf;
 139     tmpbuf = *nxtbuf++;
 140     dat[0] = innum ? innum : outnum;
 141     dat[1] = curflg;
 142     dat[4] = unseen;
 143
 144     /*
 145      * Get the first field.  If the message is non-empty
 146      * and we're doing an "inc", open the output file.
 147      */
 148     if ((state = m_getfld (FLD, name, tmpbuf, rlwidth, inb)) == FILEEOF) {
 149         if (ferror(inb)) {
 150             advise("read", "unable to"); /* "read error" */
 151             return SCNFAT;
 152         } else {
 153             return SCNEOF;
 154         }
 155     }
 156
 157     if (outnum) {
 158         if (outnum > 0) {
 159             scnmsg = m_name (outnum);
 160             if (*scnmsg == '?')         /* msg num out of range */
 161                 return SCNNUM;
 162         } else {
 163             scnmsg = "/dev/null";
 164         }
 165         if ((scnout = fopen (scnmsg, "w")) == NULL)
 166             adios (scnmsg, "unable to write");
 167 #ifdef RPATHS
 168         /*
 169          * Add the Return-Path and Delivery-Date
 170          * header fields to message.
 171          */
 172         if (get_returnpath (returnpath, sizeof(returnpath),
 173                 deliverydate, sizeof(deliverydate))) {
 174             FPUTS ("Return-Path: ");
 175             FPUTS (returnpath);
 176             FPUTS ("Delivery-Date: ");
 177             FPUTS (deliverydate);
 178         }
 179 #endif /* RPATHS */
 180     }
 181
 182     /* scan - main loop */
 183     for (compnum = 1; ; state = m_getfld (state, name, tmpbuf, rlwidth, inb)) {
 184         switch (state) {
 185             case FLD:
 186             case FLDPLUS:
 187                 compnum++;
 188                 if (outnum) {
 189                     FPUTS (name);
 190                     putc (':', scnout);
 191                     FPUTS (tmpbuf);
 192                 }
 193                 /*
 194                  * if we're interested in this component, save a pointer
 195                  * to the component text, then start using our next free
 196                  * buffer as the component temp buffer (buffer switching
 197                  * saves an extra copy of the component text).
 198                  */
 199                 if ((cptr = wantcomp[CHASH(name)])) {
 200                     do {
 201                         if (!strcasecmp(name, cptr->c_name)) {
 202                             if (! cptr->c_text) {
 203                                 cptr->c_text = tmpbuf;
 204                                 for (cp = tmpbuf + strlen (tmpbuf) - 1;
 205                                         cp >= tmpbuf; cp--)
 206                                     if (isspace (*cp))
 207                                         *cp = 0;
 208                                     else
 209                                         break;
 210                                 *--savecomp = cptr;
 211                                 tmpbuf = *nxtbuf++;
 212                             }
 213                             break;
 214                         }
 215                     } while ((cptr = cptr->c_next));
 216                 }
 217
 218                 while (state == FLDPLUS) {
 219                     state = m_getfld (state, name, tmpbuf, rlwidth, inb);
 220                     if (outnum)
 221                         FPUTS (tmpbuf);
 222                 }
 223                 break;
 224
 225             case BODY:
 226                 compnum = -1;
 227                 if (! outnum) {
 228                     state = FILEEOF; /* stop now if scan cmd */
 229                     goto finished;
 230                 }
 231                 putc ('\n', scnout);
 232                 FPUTS (tmpbuf);
 233                 /*
 234                  * performance hack: some people like to run "inc" on
 235                  * things like net.sources or large digests.  We do a
 236                  * copy directly into the output buffer rather than
 237                  * going through an intermediate buffer.
 238                  *
 239                  * We need the amount of data m_getfld found & don't
 240                  * want to do a strlen on the long buffer so there's
 241                  * a hack in m_getfld to save the amount of data it
 242                  * returned in the global "msg_count".
 243                  */
 244 body:;
 245                 while (state == BODY) {
 246 #ifdef LINUX_STDIO
 247                     if (scnout->_IO_write_ptr == scnout->_IO_write_end) {
 248 #else
 249                     if (scnout->_cnt <= 0) {
 250 #endif
 251                         if (fflush(scnout) == EOF)
 252                             adios (scnmsg, "write error on");
 253                     }
 254 #ifdef LINUX_STDIO
 255                     state = m_getfld(state, name, scnout->_IO_write_ptr,
 256                         (long)scnout->_IO_write_ptr-(long)scnout->_IO_write_end , inb);
 257                     scnout->_IO_write_ptr += msg_count;
 258 #else
 259                     state = m_getfld( state, name, scnout->_ptr, -(scnout->_cnt), inb );
 260                     scnout->_cnt -= msg_count;
 261                     scnout->_ptr += msg_count;
 262 #endif
 263                 }
 264                 goto finished;
 265
 266             case LENERR:
 267             case FMTERR:
 268                 fprintf (stderr,
 269                         innum ? "??Format error (message %d) in "
 270                               : "??Format error in ",
 271                         outnum ? outnum : innum);
 272                 fprintf (stderr, "component %d\n", compnum);
 273
 274                 if (outnum) {
 275                     FPUTS ("\n\nBAD MSG:\n");
 276                     FPUTS (name);
 277                     putc ('\n', scnout);
 278                     state = BODY;
 279                     goto body;
 280                 }
 281                 /* fall through */
 282
 283             case FILEEOF:
 284                 goto finished;
 285
 286             default:
 287                 adios (NULL, "getfld() returned %d", state);
 288         }
 289     }
 290
 291     /*
 292      * format and output the scan line.
 293      */
 294 finished:
 295     if (ferror(inb)) {
 296         advise("read", "unable to"); /* "read error" */
 297         return SCNFAT;
 298     }
 299
 300     /* Save and restore buffer so we don't trash our dynamic pool! */
 301     if (bodycomp) {
 302         saved_c_text = bodycomp->c_text;
 303         bodycomp->c_text = tmpbuf;
 304     }
 305
 306     if (size)
 307         dat[2] = size;
 308     else if (outnum > 0)
 309         dat[2] = ftell(scnout);
 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 = -1;
 326             } else {
 327                 datecomp->c_flags = 0;
 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         adios (scnmsg, "write error on");
 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