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