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