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