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.
  34 */
  35 #define SBUFSIZ 512
  36
  37 static struct format *fmt;
  38
  39 static struct comp *datecomp;  /* pntr to "date" comp */
  40 static int ncomps = 0;  /* # of interesting components */
  41 static char **compbuffers = NULL;  /* buffers for component text */
  42 static struct comp **used_buf = NULL;  /* stack for comp that use buffers */
  43
  44 static int dat[5];  /* aux. data for format routine */
  45
  46 char *scanl = NULL;  /* text of most recent scanline */
  47
  48 #define FPUTS(buf) {\
  49                 if (fputs(buf, scnout) == EOF)\
  50                         adios(scnmsg, "write error on");\
  51         }
  52
  53 /*
  54 ** prototypes
  55 */
  56 int sc_width(void);  /* from termsbr.c */
  57
  58 #ifdef MULTIBYTE_SUPPORT
  59 #define SCAN_CHARWIDTH MB_CUR_MAX
  60 #else
  61 #define SCAN_CHARWIDTH 1
  62 #endif
  63
  64 int
  65 scan(FILE *inb, int innum, int outnum, char *fmtstr, int width, int curflg,
  66         int unseen)
  67 {
  68         static int slwidth;
  69         int i, compnum, state;
  70         unsigned char *cp, *tmpbuf;
  71         char **nxtbuf;
  72         struct comp *cptr;
  73         struct comp **savecomp;
  74         char *scnmsg = NULL;
  75         FILE *scnout = NULL;
  76         char name[NAMESZ];
  77         char returnpath[BUFSIZ];
  78         char deliverydate[BUFSIZ];
  79         int incing = (outnum > 0);
  80         int scanfolder = (outnum == 0);
  81
  82         /* first-time only initialization */
  83         if (!scanl) {
  84                 if (width == 0) {
  85                         if ((width = sc_width()) < WIDTH/2)
  86                                 width = WIDTH/2;
  87                         else if (width > MAXSCANL)
  88                                 width = MAXSCANL;
  89                 }
  90                 dat[3] = slwidth = width;
  91                 scanl = (char *) mh_xmalloc((size_t) SCAN_CHARWIDTH *
  92                                 (slwidth + 2));  /* probably for \n and \0 */
  93                 if (incing)
  94                         umask(~m_gmprot());
  95
  96                 /* Compile format string */
  97                 ncomps = fmt_compile(fmtstr, &fmt) + 1;
  98
  99                 FINDCOMP(datecomp, "date");
 100                 nxtbuf = compbuffers = (char **) calloc((size_t) ncomps,
 101                                 sizeof(char *));
 102                 if (!nxtbuf)
 103                         adios(NULL, "unable to allocate component buffers");
 104                 used_buf = (struct comp **) calloc((size_t) (ncomps+1),
 105                                 sizeof(struct comp *));
 106                 if (!used_buf)
 107                         adios(NULL, "unable to allocate component buffer stack");
 108                 /* NULL-terminate array */
 109                 used_buf += ncomps;
 110                 *used_buf = NULL;
 111                 /* allocate space for the items */
 112                 for (i = ncomps; i--; )
 113                         *nxtbuf++ = mh_xmalloc(SBUFSIZ);
 114         }
 115
 116         /*
 117         ** each-message initialization
 118         */
 119         nxtbuf = compbuffers;
 120         savecomp = used_buf;
 121         tmpbuf = *nxtbuf++;
 122         dat[0] = innum ? innum : outnum;
 123         dat[1] = curflg;
 124         dat[4] = unseen;
 125
 126         /*
 127         ** Get the first field.  If the message is non-empty
 128         ** and we're doing an "inc", open the output file.
 129         */
 130         if ((state = m_getfld(FLD, name, tmpbuf, SBUFSIZ, inb)) == FILEEOF) {
 131                 if (ferror(inb)) {
 132                         advise("read", "unable to"); /* "read error" */
 133                         return SCNFAT;
 134                 } else {
 135                         return SCNEOF;
 136                 }
 137         }
 138
 139         if (incing) {
 140                 scnmsg = m_name(outnum);
 141                 if (*scnmsg == '?')  /* msg num out of range */
 142                         return SCNNUM;
 143                 if (!(scnout = fopen(scnmsg, "w")))
 144                         adios(scnmsg, "unable to write");
 145                 /*
 146                 ** Add the Return-Path and Delivery-Date
 147                 ** header fields to message.
 148                 */
 149                 if (get_returnpath(returnpath, sizeof(returnpath),
 150                                 deliverydate, sizeof(deliverydate))) {
 151                         FPUTS("Return-Path: ");
 152                         FPUTS(returnpath);
 153                         FPUTS("Delivery-Date: ");
 154                         FPUTS(deliverydate);
 155                 }
 156         }
 157
 158         /* scan - main loop */
 159         for (compnum = 1; ;
 160                         state = m_getfld(state, name, tmpbuf, SBUFSIZ, inb)) {
 161                 switch (state) {
 162                 case FLD:
 163                 case FLDPLUS:
 164                         compnum++;
 165                         if (incing) {
 166                                 FPUTS(name);
 167                                 FPUTS(":");
 168                                 FPUTS(tmpbuf);
 169                         }
 170                         /*
 171                         ** if we're interested in this component, save
 172                         ** a pointer to the component text, then start
 173                         ** using our next free buffer as the component
 174                         ** temp buffer (buffer switching saves an extra
 175                         ** copy of the component text).
 176                         */
 177                         if ((cptr = wantcomp[CHASH(name)])) {
 178                                 do {
 179                                         if (!mh_strcasecmp(name, cptr->c_name)) {
 180                                                 if (! cptr->c_text) {
 181                                                         cptr->c_text = tmpbuf;
 182                                                         for (cp = tmpbuf + strlen(tmpbuf) - 1; cp >= tmpbuf; cp--)
 183                                                                 if (isspace(*cp))
 184                                                                         *cp = 0;
 185                                                                 else
 186                                                                         break;
 187                                                         *--savecomp = cptr;
 188                                                         tmpbuf = *nxtbuf++;
 189                                                 }
 190                                                 break;
 191                                         }
 192                                 } while ((cptr = cptr->c_next));
 193                         }
 194
 195                         while (state == FLDPLUS) {
 196                                 state = m_getfld(state, name, tmpbuf, SBUFSIZ,
 197                                                 inb);
 198                                 if (incing)
 199                                         FPUTS(tmpbuf);
 200                         }
 201                         break;
 202
 203                 case BODY:
 204                         compnum = -1;
 205                         if (!incing) {
 206                                 state = FILEEOF; /* stop here if scan cmd */
 207                                 goto finished;
 208                         }
 209                         FPUTS("\n");
 210                         FPUTS(tmpbuf);
 211                         /*
 212                         ** performance hack: some people like to run "inc"
 213                         ** on things like net.sources or large digests.
 214                         ** We do a copy directly into the output buffer
 215                         ** rather than going through an intermediate buffer.
 216                         **
 217                         ** We need the amount of data m_getfld found &
 218                         ** don't want to do a strlen on the long buffer so
 219                         ** there's a hack in m_getfld to save the amount
 220                         ** of data it returned in the global "msg_count".
 221                         */
 222 body:;
 223                         while (state == BODY) {
 224 #ifdef LINUX_STDIO
 225                                 if (scnout->_IO_write_ptr == scnout->_IO_write_end) {
 226 #elif defined(__DragonFly__)
 227                                 if (((struct __FILE_public *)scnout)->_w <= 0) {
 228 #else
 229                                 if (scnout->_cnt <= 0) {
 230 #endif
 231                                         if (fflush(scnout) == EOF)
 232                                                 adios(scnmsg, "write error on");
 233                                 }
 234 #ifdef LINUX_STDIO
 235                                 state = m_getfld(state, name, scnout->_IO_write_ptr, (long)scnout->_IO_write_ptr-(long)scnout->_IO_write_end , inb);
 236                                 scnout->_IO_write_ptr += msg_count;
 237 #elif defined(__DragonFly__)
 238                                 state = m_getfld(state, name, ((struct __FILE_public *)scnout)->_p, -(((struct __FILE_public *)scnout)->_w), inb);
 239                                 ((struct __FILE_public *)scnout)->_w -= msg_count;
 240                                 ((struct __FILE_public *)scnout)->_p += msg_count;
 241 #else
 242                                 state = m_getfld(state, name, scnout->_ptr, -(scnout->_cnt), inb);
 243                                 scnout->_cnt -= msg_count;
 244                                 scnout->_ptr += msg_count;
 245 #endif
 246                         }
 247                         goto finished;
 248
 249                 case LENERR:
 250                 case FMTERR:
 251                         fprintf(stderr, innum ? "??Format error (message %d) in " : "??Format error in ", outnum ? outnum : innum);
 252                         fprintf(stderr, "component %d\n", compnum);
 253
 254                         if (incing) {
 255                                 FPUTS("\n\nBAD MSG:\n");
 256                                 FPUTS(name);
 257                                 FPUTS("\n");
 258                                 state = BODY;
 259                                 goto body;
 260                         }
 261                         /* fall through if we scan only */
 262
 263                 case FILEEOF:
 264                         goto finished;
 265
 266                 default:
 267                         adios(NULL, "getfld() returned %d", state);
 268                 }
 269         }
 270
 271 finished:
 272
 273         /* Format and output the scan line. */
 274         if (ferror(inb)) {
 275                 advise("read", "unable to");
 276                 return SCNFAT;
 277         }
 278
 279         if (incing) {
 280                 if ((dat[2] = ftell(scnout)) == EOF)
 281                         adios(scnmsg, "write error on");
 282         }
 283
 284         if ((datecomp && !datecomp->c_text) || scanfolder) {
 285                 struct stat st;
 286
 287                 fstat(fileno(inb), &st);
 288                 if (scanfolder)
 289                         dat[2] = st.st_size;
 290                 if (datecomp) {
 291                         if (!datecomp->c_text) {
 292                                 if (!datecomp->c_tws)
 293                                         datecomp->c_tws = (struct tws *) calloc((size_t) 1, sizeof(*datecomp->c_tws));
 294                                 if (!datecomp->c_tws)
 295                                         adios(NULL, "unable to allocate tws buffer");
 296                                 *datecomp->c_tws = *dlocaltime((time_t *) &st.st_mtime);
 297                                 datecomp->c_flags |= CF_DATEFAB|CF_TRUE;
 298                         } else {
 299                                 datecomp->c_flags &= ~CF_DATEFAB;
 300                         }
 301                 }
 302         }
 303
 304         /* print the scan line */
 305         fmt_scan(fmt, scanl, slwidth, dat);
 306         if (fmtstr)
 307                 fputs(scanl, stdout);
 308
 309         /* return dynamically allocated buffers to pool */
 310         while ((cptr = *savecomp++)) {
 311                 *--nxtbuf = cptr->c_text;
 312                 cptr->c_text = NULL;
 313         }
 314         *--nxtbuf = tmpbuf;
 315
 316         if (incing && (ferror(scnout) || fclose(scnout) == EOF))
 317                 adios(scnmsg, "write error on");
 318
 319         return (state != FILEEOF ? SCNERR : SCNMSG);
 320 }