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 *fmtstr, int width, int curflg,
  71         int unseen)
  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(fmtstr, &fmt) + 1;
 105
 106                 FINDCOMP(bodycomp, "body");
 107                 FINDCOMP(datecomp, "date");
 108                 nxtbuf = compbuffers = (char **) calloc((size_t) ncomps,
 109                                 sizeof(char *));
 110                 if (nxtbuf == NULL)
 111                         adios(NULL, "unable to allocate component buffers");
 112                 used_buf = (struct comp **) calloc((size_t) (ncomps+1),
 113                         sizeof(struct comp *));
 114                 if (used_buf == NULL)
 115                         adios(NULL, "unable to allocate component buffer stack");
 116                 used_buf += ncomps+1; *--used_buf = 0;
 117                 rlwidth = bodycomp && (width > SBUFSIZ) ? width : SBUFSIZ;
 118                 for (i = ncomps; i--; )
 119                         *nxtbuf++ = mh_xmalloc(rlwidth);
 120         }
 121
 122         /*
 123         ** each-message initialization
 124         */
 125         nxtbuf = compbuffers;
 126         savecomp = used_buf;
 127         tmpbuf = *nxtbuf++;
 128         dat[0] = innum ? innum : outnum;
 129         dat[1] = curflg;
 130         dat[4] = unseen;
 131
 132         /*
 133         ** Get the first field.  If the message is non-empty
 134         ** and we're doing an "inc", open the output file.
 135         */
 136         if ((state = m_getfld(FLD, name, tmpbuf, rlwidth, inb)) == FILEEOF) {
 137                 if (ferror(inb)) {
 138                         advise("read", "unable to"); /* "read error" */
 139                         return SCNFAT;
 140                 } else {
 141                         return SCNEOF;
 142                 }
 143         }
 144
 145         if (outnum) {
 146                 if (outnum > 0) {
 147                         scnmsg = m_name(outnum);
 148                         if (*scnmsg == '?')  /* msg num out of range */
 149                                 return SCNNUM;
 150                 } else {
 151                         scnmsg = "/dev/null";
 152                 }
 153                 if ((scnout = fopen(scnmsg, "w")) == NULL)
 154                         adios(scnmsg, "unable to write");
 155 #ifdef RPATHS
 156                 /*
 157                 ** Add the Return-Path and Delivery-Date
 158                 ** header fields to message.
 159                 */
 160                 if (get_returnpath(returnpath, sizeof(returnpath),
 161                                 deliverydate, sizeof(deliverydate))) {
 162                         FPUTS("Return-Path: ");
 163                         FPUTS(returnpath);
 164                         FPUTS("Delivery-Date: ");
 165                         FPUTS(deliverydate);
 166                 }
 167 #endif /* RPATHS */
 168         }
 169
 170         /* scan - main loop */
 171         for (compnum = 1; ;
 172                         state = m_getfld(state, name, tmpbuf, rlwidth, inb)) {
 173                 switch (state) {
 174                 case FLD:
 175                 case FLDPLUS:
 176                         compnum++;
 177                         if (outnum) {
 178                                 FPUTS(name);
 179                                 if (putc(':', scnout) == EOF)
 180                                         DIEWRERR();
 181                                 FPUTS(tmpbuf);
 182                         }
 183                         /*
 184                         ** if we're interested in this component, save
 185                         ** a pointer to the component text, then start
 186                         ** using our next free buffer as the component
 187                         ** temp buffer (buffer switching saves an extra
 188                         ** copy of the component text).
 189                         */
 190                         if ((cptr = wantcomp[CHASH(name)])) {
 191                                 do {
 192                                         if (!mh_strcasecmp(name, cptr->c_name)) {
 193                                                 if (! cptr->c_text) {
 194                                                         cptr->c_text = tmpbuf;
 195                                                         for (cp = tmpbuf + strlen(tmpbuf) - 1; cp >= tmpbuf; cp--)
 196                                                                 if (isspace(*cp))
 197                                                                         *cp = 0;
 198                                                                 else
 199                                                                         break;
 200                                                         *--savecomp = cptr;
 201                                                         tmpbuf = *nxtbuf++;
 202                                                 }
 203                                                 break;
 204                                         }
 205                                 } while ((cptr = cptr->c_next));
 206                         }
 207
 208                         while (state == FLDPLUS) {
 209                                 state = m_getfld(state, name, tmpbuf, rlwidth,
 210                                                 inb);
 211                                 if (outnum)
 212                                         FPUTS(tmpbuf);
 213                         }
 214                         break;
 215
 216                 case BODY:
 217                         compnum = -1;
 218                         if (! outnum) {
 219                                 state = FILEEOF; /* stop now if scan cmd */
 220                                 goto finished;
 221                         }
 222                         if (putc('\n', scnout) == EOF) DIEWRERR();
 223                         FPUTS(tmpbuf);
 224                         /*
 225                         ** performance hack: some people like to run "inc"
 226                         ** on things like net.sources or large digests.
 227                         ** We do a copy directly into the output buffer
 228                         ** rather than going through an intermediate buffer.
 229                         **
 230                         ** We need the amount of data m_getfld found &
 231                         ** don't want to do a strlen on the long buffer so
 232                         ** there's a hack in m_getfld to save the amount
 233                         ** of data it returned in the global "msg_count".
 234                         */
 235 body:;
 236                         while (state == BODY) {
 237 #ifdef LINUX_STDIO
 238                                 if (scnout->_IO_write_ptr == scnout->_IO_write_end) {
 239 #elif defined(__DragonFly__)
 240                                 if (((struct __FILE_public *)scnout)->_w <= 0) {
 241 #else
 242                                 if (scnout->_cnt <= 0) {
 243 #endif
 244                                         if (fflush(scnout) == EOF)
 245                                                 DIEWRERR();
 246                                 }
 247 #ifdef LINUX_STDIO
 248                                 state = m_getfld(state, name, scnout->_IO_write_ptr, (long)scnout->_IO_write_ptr-(long)scnout->_IO_write_end , inb);
 249                                 scnout->_IO_write_ptr += msg_count;
 250 #elif defined(__DragonFly__)
 251                                 state = m_getfld(state, name, ((struct __FILE_public *)scnout)->_p, -(((struct __FILE_public *)scnout)->_w), inb);
 252                                 ((struct __FILE_public *)scnout)->_w -= msg_count;
 253                                 ((struct __FILE_public *)scnout)->_p += msg_count;
 254 #else
 255                                 state = m_getfld( state, name, scnout->_ptr, -(scnout->_cnt), inb);
 256                                 scnout->_cnt -= msg_count;
 257                                 scnout->_ptr += msg_count;
 258 #endif
 259                         }
 260                         goto finished;
 261
 262                 case LENERR:
 263                 case FMTERR:
 264                         fprintf(stderr, innum ? "??Format error (message %d) in " : "??Format error in ", outnum ? outnum : innum);
 265                         fprintf(stderr, "component %d\n", compnum);
 266
 267                         if (outnum) {
 268                                 FPUTS("\n\nBAD MSG:\n");
 269                                 FPUTS(name);
 270                                 if (putc('\n', scnout) == EOF)
 271                                         DIEWRERR();
 272                                 state = BODY;
 273                                 goto body;
 274                         }
 275                         /* fall through */
 276
 277                 case FILEEOF:
 278                         goto finished;
 279
 280                 default:
 281                         adios(NULL, "getfld() returned %d", state);
 282                 }
 283         }
 284
 285         /*
 286         ** format and output the scan line.
 287         */
 288 finished:
 289         if (ferror(inb)) {
 290                 advise("read", "unable to"); /* "read error" */
 291                 return SCNFAT;
 292         }
 293
 294         /* Save and restore buffer so we don't trash our dynamic pool! */
 295         if (bodycomp) {
 296                 saved_c_text = bodycomp->c_text;
 297                 bodycomp->c_text = tmpbuf;
 298         }
 299
 300         if (outnum > 0) {
 301                 dat[2] = ftell(scnout);
 302                 if (dat[2] == EOF)
 303                         DIEWRERR();
 304         }
 305
 306         if ((datecomp && !datecomp->c_text) || !outnum) {
 307                 struct stat st;
 308
 309                 fstat(fileno(inb), &st);
 310                 if (!outnum)
 311                         dat[2] = st.st_size;
 312                 if (datecomp) {
 313                         if (! datecomp->c_text) {
 314                                 if (datecomp->c_tws == NULL)
 315                                         datecomp->c_tws = (struct tws *) calloc((size_t) 1, sizeof(*datecomp->c_tws));
 316                                 if (datecomp->c_tws == NULL)
 317                                         adios(NULL, "unable to allocate tws buffer");
 318                                 *datecomp->c_tws = *dlocaltime((time_t *) &st.st_mtime);
 319                                 datecomp->c_flags |= CF_DATEFAB|CF_TRUE;
 320                         } else {
 321                                 datecomp->c_flags &= ~CF_DATEFAB;
 322                         }
 323                 }
 324         }
 325
 326         fmt_scan(fmt, scanl, slwidth, dat);
 327
 328         if (bodycomp)
 329                 bodycomp->c_text = saved_c_text;
 330
 331         if (fmtstr)
 332                 fputs(scanl, stdout);
 333
 334         /* return dynamically allocated buffers to pool */
 335         while ((cptr = *savecomp++)) {
 336                 *--nxtbuf = cptr->c_text;
 337                 cptr->c_text = NULL;
 338         }
 339         *--nxtbuf = tmpbuf;
 340
 341         if (outnum && (ferror(scnout) || fclose(scnout) == EOF))
 342                 DIEWRERR();
 343
 344         return (state != FILEEOF ? SCNERR : SCNMSG);
 345 }