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 static struct comp *datecomp;           /* pntr to "date" comp             */
  35 static struct comp *bodycomp;           /* pntr to "body" pseudo-comp      *
  36                                          * (if referenced)                 */
  37 static int ncomps = 0;                  /* # of interesting components     */
  38 static char **compbuffers = 0;          /* buffers for component text      */
  39 static struct comp **used_buf = 0;      /* stack for comp that use buffers */
  40
  41 static int dat[5];                      /* aux. data for format routine    */
  42
  43 char *scanl = 0;                        /* text of most recent scanline    */
  44
  45 #define DIEWRERR() adios (scnmsg, "write error on")
  46
  47 #define FPUTS(buf) {\
  48                 if (mh_fputs(buf,scnout) == EOF)\
  49                     DIEWRERR();\
  50                 }
  51
  52 /*
  53  * prototypes
  54  */
  55 static int mh_fputs(char *, FILE *);
  56
  57 #ifdef MULTIBYTE_SUPPORT
  58 #define SCAN_CHARWIDTH MB_CUR_MAX
  59 #else
  60 #define SCAN_CHARWIDTH 1
  61 #endif
  62
  63 int
  64 scan (FILE *inb, int innum, int outnum, char *nfs, int width, int curflg,
  65       int unseen, char *folder, long size, int noisy)
  66 {
  67     int i, compnum, encrypted, state;
  68     unsigned char *cp, *tmpbuf;
  69     char **nxtbuf;
  70     char *saved_c_text = NULL;
  71     struct comp *cptr;
  72     struct comp **savecomp;
  73     char *scnmsg = NULL;
  74     FILE *scnout = NULL;
  75     char name[NAMESZ];
  76     static int rlwidth, slwidth;
  77     static size_t scanl_size;
  78
  79     /* first-time only initialization */
  80     if (!scanl) {
  81         if (width == 0) {
  82             if ((width = sc_width ()) < WIDTH/2)
  83                 width = WIDTH/2;
  84             else if (width > MAXSCANL)
  85                 width = MAXSCANL;
  86         }
  87         dat[3] = slwidth = width;
  88         /* Arbitrarily allocate 20 * slwidth to provide room for lots
  89            of escape sequences. */
  90         scanl_size = SCAN_CHARWIDTH * (20 * slwidth + 2);
  91         scanl = (char *) mh_xmalloc (scanl_size);
  92         if (outnum)
  93             umask(~m_gmprot());
  94
  95         /* Compile format string */
  96         ncomps = fmt_compile (nfs, &fmt) + 1;
  97
  98         FINDCOMP(bodycomp, "body");
  99         FINDCOMP(datecomp, "date");
 100         FINDCOMP(cptr, "folder");
 101         if (cptr && folder)
 102             cptr->c_text = folder;
 103         FINDCOMP(cptr, "encrypted");
 104         if (!cptr)
 105             if ((cptr = (struct comp *) calloc (1, sizeof(*cptr)))) {
 106                 cptr->c_name = "encrypted";
 107                 cptr->c_next = wantcomp[i = CHASH (cptr->c_name)];
 108                 wantcomp[i] = cptr;
 109                 ncomps++;
 110         }
 111         FINDCOMP (cptr, "dtimenow");
 112         if (cptr)
 113             cptr->c_text = getcpy(dtimenow (0));
 114         nxtbuf = compbuffers = (char **) calloc((size_t) ncomps, sizeof(char *));
 115         if (nxtbuf == NULL)
 116             adios (NULL, "unable to allocate component buffers");
 117         used_buf = (struct comp **) calloc((size_t) (ncomps+1),
 118             sizeof(struct comp *));
 119         if (used_buf == NULL)
 120             adios (NULL, "unable to allocate component buffer stack");
 121         used_buf += ncomps+1; *--used_buf = 0;
 122         rlwidth = bodycomp && (width > SBUFSIZ) ? width : SBUFSIZ;
 123         for (i = ncomps; i--; )
 124             *nxtbuf++ = mh_xmalloc(rlwidth);
 125     }
 126
 127     /*
 128      * each-message initialization
 129      */
 130     nxtbuf = compbuffers;
 131     savecomp = used_buf;
 132     tmpbuf = *nxtbuf++;
 133     dat[0] = innum ? innum : outnum;
 134     dat[1] = curflg;
 135     dat[4] = unseen;
 136
 137     /*
 138      * Get the first field.  If the message is non-empty
 139      * and we're doing an "inc", open the output file.
 140      */
 141     if ((state = m_getfld (FLD, name, tmpbuf, rlwidth, inb)) == FILEEOF) {
 142         if (ferror(inb)) {
 143             advise("read", "unable to"); /* "read error" */
 144             return SCNFAT;
 145         } else {
 146             return SCNEOF;
 147         }
 148     }
 149
 150     if (outnum) {
 151         if (outnum > 0) {
 152             scnmsg = m_name (outnum);
 153             if (*scnmsg == '?')         /* msg num out of range */
 154                 return SCNNUM;
 155         } else {
 156             scnmsg = "/dev/null";
 157         }
 158         if ((scnout = fopen (scnmsg, "w")) == NULL)
 159             adios (scnmsg, "unable to write");
 160     }
 161
 162     /* scan - main loop */
 163     for (compnum = 1; ; state = m_getfld (state, name, tmpbuf, rlwidth, inb)) {
 164         switch (state) {
 165             case FLD:
 166             case FLDPLUS:
 167                 compnum++;
 168                 if (outnum) {
 169                     FPUTS (name);
 170                     if ( putc (':', scnout) == EOF) DIEWRERR();
 171                     FPUTS (tmpbuf);
 172                 }
 173                 /*
 174                  * if we're interested in this component, save a pointer
 175                  * to the component text, then start using our next free
 176                  * buffer as the component temp buffer (buffer switching
 177                  * saves an extra copy of the component text).
 178                  */
 179                 if ((cptr = wantcomp[CHASH(name)])) {
 180                     do {
 181                         if (!mh_strcasecmp(name, cptr->c_name)) {
 182                             if (! cptr->c_text) {
 183                                 cptr->c_text = tmpbuf;
 184                                 for (cp = tmpbuf + strlen (tmpbuf) - 1;
 185                                         cp >= tmpbuf; cp--)
 186                                     if (isspace (*cp))
 187                                         *cp = 0;
 188                                     else
 189                                         break;
 190                                 *--savecomp = cptr;
 191                                 tmpbuf = *nxtbuf++;
 192                             }
 193                             break;
 194                         }
 195                     } while ((cptr = cptr->c_next));
 196                 }
 197
 198                 while (state == FLDPLUS) {
 199                     state = m_getfld (state, name, tmpbuf, rlwidth, inb);
 200                     if (outnum)
 201                         FPUTS (tmpbuf);
 202                 }
 203                 break;
 204
 205             case BODY:
 206                 compnum = -1;
 207                 /*
 208                  * A slight hack ... if we have less than rlwidth characters
 209                  * in the buffer, call m_getfld again.
 210                  */
 211
 212                 if ((i = strlen(tmpbuf)) < rlwidth) {
 213                     state = m_getfld (state, name, tmpbuf + i,
 214                                       rlwidth - i, inb);
 215                 }
 216                 if (! outnum) {
 217                     state = FILEEOF; /* stop now if scan cmd */
 218                     goto finished;
 219                 }
 220                 if (putc ('\n', scnout) == EOF) DIEWRERR();
 221                 FPUTS (tmpbuf);
 222                 /*
 223                  * performance hack: some people like to run "inc" on
 224                  * things like net.sources or large digests.  We do a
 225                  * copy directly into the output buffer rather than
 226                  * going through an intermediate buffer.
 227                  *
 228                  * We need the amount of data m_getfld found & don't
 229                  * want to do a strlen on the long buffer so there's
 230                  * a hack in m_getfld to save the amount of data it
 231                  * returned in the global "msg_count".
 232                  */
 233 body:;
 234                 while (state == BODY) {
 235 #ifdef LINUX_STDIO
 236                     if (scnout->_IO_write_ptr == scnout->_IO_write_end) {
 237 #elif defined(__DragonFly__)
 238                     if (((struct __FILE_public *)scnout)->_w <= 0) {
 239 #else
 240                     if (scnout->_cnt <= 0) {
 241 #endif
 242                         if (fflush(scnout) == EOF)
 243                             DIEWRERR ();
 244                     }
 245 #ifdef LINUX_STDIO
 246                     state = m_getfld(state, name, scnout->_IO_write_ptr,
 247                         (long)scnout->_IO_write_ptr-(long)scnout->_IO_write_end , inb);
 248                     scnout->_IO_write_ptr += msg_count;
 249 #elif defined(__DragonFly__)
 250                     state = m_getfld( state, name, ((struct __FILE_public *)scnout)->_p, -(((struct __FILE_public *)scnout)->_w), inb );
 251                     ((struct __FILE_public *)scnout)->_w -= msg_count;
 252                     ((struct __FILE_public *)scnout)->_p += msg_count;
 253 #else
 254                     state = m_getfld( state, name, scnout->_ptr, -(scnout->_cnt), inb );
 255                     scnout->_cnt -= msg_count;
 256                     scnout->_ptr += msg_count;
 257 #endif
 258                 }
 259                 goto finished;
 260
 261             case LENERR:
 262             case FMTERR:
 263                 fprintf (stderr,
 264                         innum ? "??Format error (message %d) in "
 265                               : "??Format error in ",
 266                         outnum ? outnum : innum);
 267                 fprintf (stderr, "component %d\n", compnum);
 268
 269                 if (outnum) {
 270                     FPUTS ("\n\nBAD MSG:\n");
 271                     FPUTS (name);
 272                     if (putc ('\n', scnout) == EOF) DIEWRERR();
 273                     state = BODY;
 274                     goto body;
 275                 }
 276                 /* fall through */
 277
 278             case FILEEOF:
 279                 goto finished;
 280
 281             default:
 282                 adios (NULL, "getfld() returned %d", state);
 283         }
 284     }
 285
 286     /*
 287      * format and output the scan line.
 288      */
 289 finished:
 290     if (ferror(inb)) {
 291         advise("read", "unable to"); /* "read error" */
 292         return SCNFAT;
 293     }
 294
 295     /* Save and restore buffer so we don't trash our dynamic pool! */
 296     if (bodycomp) {
 297         saved_c_text = bodycomp->c_text;
 298         bodycomp->c_text = tmpbuf;
 299     }
 300
 301     if (size)
 302         dat[2] = size;
 303     else if (outnum > 0)
 304     {
 305         dat[2] = ftell(scnout);
 306         if (dat[2] == EOF) DIEWRERR();
 307     }
 308
 309     if ((datecomp && !datecomp->c_text) || (!size && !outnum)) {
 310         struct stat st;
 311
 312         fstat (fileno(inb), &st);
 313         if (!size && !outnum)
 314             dat[2] = st.st_size;
 315         if (datecomp) {
 316             if (! datecomp->c_text) {
 317                 if (datecomp->c_tws == NULL)
 318                     datecomp->c_tws = (struct tws *)
 319                         calloc((size_t) 1, sizeof(*datecomp->c_tws));
 320                 if (datecomp->c_tws == NULL)
 321                     adios (NULL, "unable to allocate tws buffer");
 322                 *datecomp->c_tws = *dlocaltime ((time_t *) &st.st_mtime);
 323                 datecomp->c_flags |= CF_DATEFAB|CF_TRUE;
 324             } else {
 325                 datecomp->c_flags &= ~CF_DATEFAB;
 326             }
 327         }
 328     }
 329
 330     fmt_scan (fmt, scanl, scanl_size, slwidth, dat);
 331
 332     if (bodycomp)
 333         bodycomp->c_text = saved_c_text;
 334
 335     if (noisy)
 336         fputs (scanl, stdout);
 337
 338     FINDCOMP (cptr, "encrypted");
 339     encrypted = cptr && cptr->c_text;
 340
 341     /* return dynamically allocated buffers to pool */
 342     while ((cptr = *savecomp++)) {
 343         *--nxtbuf = cptr->c_text;
 344         cptr->c_text = NULL;
 345     }
 346     *--nxtbuf = tmpbuf;
 347
 348     if (outnum && (ferror(scnout) || fclose (scnout) == EOF))
 349         DIEWRERR();
 350
 351     return (state != FILEEOF ? SCNERR : encrypted ? SCNENC : SCNMSG);
 352 }
 353
 354
 355 static int
 356 mh_fputs(char *s, FILE *stream)
 357 {
 358     char c;
 359
 360     while ((c = *s++))
 361         if (putc (c,stream) == EOF )
 362             return(EOF);
 363     return (0);
 364 }
 365