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