git.marmaro.de Git - mmh/blob - uip/scansbr.c

   1 /*
   2 ** scansbr.c -- routines to help scan along...
   3 **
   4 ** This code is Copyright (c) 2002, by the authors of nmh.  See the
   5 ** COPYRIGHT file in the root directory of the nmh distribution for
   6 ** complete copyright information.
   7 */
   8
   9 #include <h/mh.h>
  10 #include <h/addrsbr.h>
  11 #include <h/fmt_scan.h>
  12 #include <h/scansbr.h>
  13 #include <h/tws.h>
  14 #include <h/utils.h>
  15
  16 #ifdef _FSTDIO
  17 # define _ptr _p  /* Gag */
  18 # define _cnt _w  /* Wretch */
  19 #endif
  20
  21 #ifdef SCO_5_STDIO
  22 # define _ptr  __ptr
  23 # define _cnt  __cnt
  24 # define _base __base
  25 # define _filbuf(fp)  ((fp)->__cnt = 0, __filbuf(fp))
  26 #endif
  27
  28 #define MAXSCANL 256  /* longest possible scan line */
  29
  30 /*
  31 ** Buffer size for content part of header fields.  We want this
  32 ** to be large enough so that we don't do a lot of extra FLDPLUS
  33 ** calls on m_getfld but small enough so that we don't snarf
  34 ** the entire message body when we're only going to display 30
  35 ** characters of it.
  36 */
  37 #define SBUFSIZ 512
  38
  39 static struct format *fmt;
  40
  41 static struct comp *datecomp;  /* pntr to "date" comp */
  42 static struct comp *bodycomp;  /* pntr to "body" pseudo-comp (if referenced) */
  43 static int ncomps = 0;  /* # of interesting components */
  44 static char **compbuffers = NULL;  /* buffers for component text */
  45 static struct comp **used_buf = NULL;  /* stack for comp that use buffers */
  46
  47 static int dat[5];  /* aux. data for format routine */
  48
  49 char *scanl = NULL;  /* text of most recent scanline */
  50
  51 #define DIEWRERR() adios(scnmsg, "write error on")
  52
  53 #define FPUTS(buf) {\
  54                 if (fputs(buf,scnout) == EOF)\
  55                         DIEWRERR();\
  56         }
  57
  58 /*
  59 ** prototypes
  60 */
  61 int sc_width(void);  /* from termsbr.c */
  62
  63 #ifdef MULTIBYTE_SUPPORT
  64 #define SCAN_CHARWIDTH MB_CUR_MAX
  65 #else
  66 #define SCAN_CHARWIDTH 1
  67 #endif
  68
  69 int
  70 scan(FILE *inb, int innum, int outnum, char *nfs, int width, int curflg,
  71         int unseen, char *folder, long size, int noisy)
  72 {
  73         int i, compnum, state;
  74         unsigned char *cp, *tmpbuf;
  75         char **nxtbuf;
  76         char *saved_c_text = NULL;
  77         struct comp *cptr;
  78         struct comp **savecomp;
  79         char *scnmsg = NULL;
  80         FILE *scnout = NULL;
  81         char name[NAMESZ];
  82         static int rlwidth, slwidth;
  83
  84 #ifdef RPATHS
  85         char returnpath[BUFSIZ];
  86         char deliverydate[BUFSIZ];
  87 #endif
  88
  89         /* first-time only initialization */
  90         if (!scanl) {
  91                 if (width == 0) {
  92                         if ((width = sc_width()) < WIDTH/2)
  93                                 width = WIDTH/2;
  94                         else if (width > MAXSCANL)
  95                                 width = MAXSCANL;
  96                 }
  97                 dat[3] = slwidth = width;
  98                 scanl = (char *) mh_xmalloc((size_t) SCAN_CHARWIDTH *
  99                                 (slwidth + 2) );
 100                 if (outnum)
 101                         umask(~m_gmprot());
 102
 103                 /* Compile format string */
 104                 ncomps = fmt_compile(nfs, &fmt) + 1;
 105
 106                 FINDCOMP(bodycomp, "body");
 107                 FINDCOMP(datecomp, "date");
 108                 FINDCOMP(cptr, "folder");
 109                 if (cptr && folder)
 110                         cptr->c_text = folder;
 111                 FINDCOMP(cptr, "dtimenow");
 112                 if (cptr)
 113                         cptr->c_text = getcpy(dtimenow(0));
 114                 nxtbuf = compbuffers = (char **) calloc((size_t) ncomps,
 115                                 sizeof(char *));
 116                 if (nxtbuf == NULL)
 117                         adios(NULL, "unable to allocate component buffers");
 118                 used_buf = (struct comp **) calloc((size_t) (ncomps+1),
 119                         sizeof(struct comp *));
 120                 if (used_buf == NULL)
 121                         adios(NULL, "unable to allocate component buffer stack");
 122                 used_buf += ncomps+1; *--used_buf = 0;
 123                 rlwidth = bodycomp && (width > SBUFSIZ) ? width : SBUFSIZ;
 124                 for (i = ncomps; i--; )
 125                         *nxtbuf++ = mh_xmalloc(rlwidth);
 126         }
 127
 128         /*
 129         ** each-message initialization
 130         */
 131         nxtbuf = compbuffers;
 132         savecomp = used_buf;
 133         tmpbuf = *nxtbuf++;
 134         dat[0] = innum ? innum : outnum;
 135         dat[1] = curflg;
 136         dat[4] = unseen;
 137
 138         /*
 139         ** Get the first field.  If the message is non-empty
 140         ** and we're doing an "inc", open the output file.
 141         */
 142         if ((state = m_getfld(FLD, name, tmpbuf, rlwidth, inb)) == FILEEOF) {
 143                 if (ferror(inb)) {
 144                         advise("read", "unable to"); /* "read error" */
 145                         return SCNFAT;
 146                 } else {
 147                         return SCNEOF;
 148                 }
 149         }
 150
 151         if (outnum) {
 152                 if (outnum > 0) {
 153                         scnmsg = m_name(outnum);
 154                         if (*scnmsg == '?')  /* msg num out of range */
 155                                 return SCNNUM;
 156                 } else {
 157                         scnmsg = "/dev/null";
 158                 }
 159                 if ((scnout = fopen(scnmsg, "w")) == NULL)
 160                         adios(scnmsg, "unable to write");
 161 #ifdef RPATHS
 162                 /*
 163                 ** Add the Return-Path and Delivery-Date
 164                 ** header fields to message.
 165                 */
 166                 if (get_returnpath(returnpath, sizeof(returnpath),
 167                                 deliverydate, sizeof(deliverydate))) {
 168                         FPUTS("Return-Path: ");
 169                         FPUTS(returnpath);
 170                         FPUTS("Delivery-Date: ");
 171                         FPUTS(deliverydate);
 172                 }
 173 #endif /* RPATHS */
 174         }
 175
 176         /* scan - main loop */
 177         for (compnum = 1; ;
 178                         state = m_getfld(state, name, tmpbuf, rlwidth, inb)) {
 179                 switch (state) {
 180                 case FLD:
 181                 case FLDPLUS:
 182                         compnum++;
 183                         if (outnum) {
 184                                 FPUTS(name);
 185                                 if (putc(':', scnout) == EOF)
 186                                         DIEWRERR();
 187                                 FPUTS(tmpbuf);
 188                         }
 189                         /*
 190                         ** if we're interested in this component, save
 191                         ** a pointer to the component text, then start
 192                         ** using our next free buffer as the component
 193                         ** temp buffer (buffer switching saves an extra
 194                         ** copy of the component text).
 195                         */
 196                         if ((cptr = wantcomp[CHASH(name)])) {
 197                                 do {
 198                                         if (!mh_strcasecmp(name, cptr->c_name)) {
 199                                                 if (! cptr->c_text) {
 200                                                         cptr->c_text = tmpbuf;
 201                                                         for (cp = tmpbuf + strlen(tmpbuf) - 1; cp >= tmpbuf; cp--)
 202                                                                 if (isspace(*cp))
 203                                                                         *cp = 0;
 204                                                                 else
 205                                                                         break;
 206                                                         *--savecomp = cptr;
 207                                                         tmpbuf = *nxtbuf++;
 208                                                 }
 209                                                 break;
 210                                         }
 211                                 } while ((cptr = cptr->c_next));
 212                         }
 213
 214                         while (state == FLDPLUS) {
 215                                 state = m_getfld(state, name, tmpbuf, rlwidth,
 216                                                 inb);
 217                                 if (outnum)
 218                                         FPUTS(tmpbuf);
 219                         }
 220                         break;
 221
 222                 case BODY:
 223                         compnum = -1;
 224                         if (! outnum) {
 225                                 state = FILEEOF; /* stop now if scan cmd */
 226                                 goto finished;
 227                         }
 228                         if (putc('\n', scnout) == EOF) DIEWRERR();
 229                         FPUTS(tmpbuf);
 230                         /*
 231                         ** performance hack: some people like to run "inc"
 232                         ** on things like net.sources or large digests.
 233                         ** We do a copy directly into the output buffer
 234                         ** rather than going through an intermediate buffer.
 235                         **
 236                         ** We need the amount of data m_getfld found &
 237                         ** don't want to do a strlen on the long buffer so
 238                         ** there's a hack in m_getfld to save the amount
 239                         ** of data it returned in the global "msg_count".
 240                         */
 241 body:;
 242                         while (state == BODY) {
 243 #ifdef LINUX_STDIO
 244                                 if (scnout->_IO_write_ptr == scnout->_IO_write_end) {
 245 #elif defined(__DragonFly__)
 246                                 if (((struct __FILE_public *)scnout)->_w <= 0) {
 247 #else
 248                                 if (scnout->_cnt <= 0) {
 249 #endif
 250                                         if (fflush(scnout) == EOF)
 251                                                 DIEWRERR();
 252                                 }
 253 #ifdef LINUX_STDIO
 254                                 state = m_getfld(state, name, scnout->_IO_write_ptr, (long)scnout->_IO_write_ptr-(long)scnout->_IO_write_end , inb);
 255                                 scnout->_IO_write_ptr += msg_count;
 256 #elif defined(__DragonFly__)
 257                                 state = m_getfld(state, name, ((struct __FILE_public *)scnout)->_p, -(((struct __FILE_public *)scnout)->_w), inb);
 258                                 ((struct __FILE_public *)scnout)->_w -= msg_count;
 259                                 ((struct __FILE_public *)scnout)->_p += msg_count;
 260 #else
 261                                 state = m_getfld( state, name, scnout->_ptr, -(scnout->_cnt), inb);
 262                                 scnout->_cnt -= msg_count;
 263                                 scnout->_ptr += msg_count;
 264 #endif
 265                         }
 266                         goto finished;
 267
 268                 case LENERR:
 269                 case FMTERR:
 270                         fprintf(stderr, innum ? "??Format error (message %d) in " : "??Format error in ", outnum ? outnum : innum);
 271                         fprintf(stderr, "component %d\n", compnum);
 272
 273                         if (outnum) {
 274                                 FPUTS("\n\nBAD MSG:\n");
 275                                 FPUTS(name);
 276                                 if (putc('\n', scnout) == EOF)
 277                                         DIEWRERR();
 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                 if (dat[2] == EOF)
 311                         DIEWRERR();
 312         }
 313
 314         if ((datecomp && !datecomp->c_text) || (!size && !outnum)) {
 315                 struct stat st;
 316
 317                 fstat(fileno(inb), &st);
 318                 if (!size && !outnum)
 319                         dat[2] = st.st_size;
 320                 if (datecomp) {
 321                         if (! datecomp->c_text) {
 322                                 if (datecomp->c_tws == NULL)
 323                                         datecomp->c_tws = (struct tws *) calloc((size_t) 1, sizeof(*datecomp->c_tws));
 324                                 if (datecomp->c_tws == NULL)
 325                                         adios(NULL, "unable to allocate tws buffer");
 326                                 *datecomp->c_tws = *dlocaltime((time_t *) &st.st_mtime);
 327                                 datecomp->c_flags |= CF_DATEFAB|CF_TRUE;
 328                         } else {
 329                                 datecomp->c_flags &= ~CF_DATEFAB;
 330                         }
 331                 }
 332         }
 333
 334         fmt_scan(fmt, scanl, slwidth, dat);
 335
 336         if (bodycomp)
 337                 bodycomp->c_text = saved_c_text;
 338
 339         if (noisy)
 340                 fputs(scanl, stdout);
 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 : SCNMSG);
 353 }