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 != SCN_MBOX && outnum != SCN_FOLD);
  80         int scanfolder = (outnum == SCN_FOLD);
  81         long fpos;
  82
  83         /* first-time only initialization */
  84         if (!scanl) {
  85                 if (width == 0) {
  86                         if ((width = sc_width()) < WIDTH/2)
  87                                 width = WIDTH/2;
  88                         else if (width > MAXSCANL)
  89                                 width = MAXSCANL;
  90                 }
  91                 dat[3] = slwidth = width;
  92                 scanl = (char *) mh_xmalloc((size_t) SCAN_CHARWIDTH *
  93                                 (slwidth + 2));  /* probably for \n and \0 */
  94                 if (incing)
  95                         umask(~m_gmprot());
  96
  97                 /* Compile format string */
  98                 ncomps = fmt_compile(fmtstr, &fmt) + 1;
  99
 100                 FINDCOMP(datecomp, "date");
 101                 nxtbuf = compbuffers = (char **) calloc((size_t) ncomps,
 102                                 sizeof(char *));
 103                 if (!nxtbuf)
 104                         adios(NULL, "unable to allocate component buffers");
 105                 used_buf = (struct comp **) calloc((size_t) (ncomps+1),
 106                                 sizeof(struct comp *));
 107                 if (!used_buf)
 108                         adios(NULL, "unable to allocate component buffer stack");
 109                 /* NULL-terminate array */
 110                 used_buf += ncomps;
 111                 *used_buf = NULL;
 112                 /* allocate space for the items */
 113                 for (i = ncomps; i--; )
 114                         *nxtbuf++ = mh_xmalloc(SBUFSIZ);
 115         }
 116
 117         /*
 118         ** each-message initialization
 119         */
 120         nxtbuf = compbuffers;
 121         savecomp = used_buf;
 122         tmpbuf = *nxtbuf++;
 123         dat[0] = innum ? innum : outnum;
 124         dat[1] = curflg;
 125         dat[4] = unseen;
 126         fpos = ftell(inb);
 127
 128         /*
 129         ** Get the first field.  If the message is non-empty
 130         ** and we're doing an "inc", open the output file.
 131         */
 132         if ((state = m_getfld(FLD, name, tmpbuf, SBUFSIZ, inb)) == FILEEOF) {
 133                 if (ferror(inb)) {
 134                         advise("read", "unable to"); /* "read error" */
 135                         return SCNFAT;
 136                 } else {
 137                         return SCNEOF;
 138                 }
 139         }
 140
 141         if (incing) {
 142                 scnmsg = m_name(outnum);
 143                 if (*scnmsg == '?')  /* msg num out of range */
 144                         return SCNNUM;
 145                 if (!(scnout = fopen(scnmsg, "w")))
 146                         adios(scnmsg, "unable to write");
 147                 /*
 148                 ** Add the Return-Path and Delivery-Date
 149                 ** header fields to message.
 150                 */
 151                 if (get_returnpath(returnpath, sizeof(returnpath),
 152                                 deliverydate, sizeof(deliverydate))) {
 153                         FPUTS("Return-Path: ");
 154                         FPUTS(returnpath);
 155                         FPUTS("Delivery-Date: ");
 156                         FPUTS(deliverydate);
 157                 }
 158         }
 159
 160         /* scan - main loop */
 161         for (compnum = 1; ;
 162                         state = m_getfld(state, name, tmpbuf, SBUFSIZ, inb)) {
 163                 switch (state) {
 164                 case FLD:
 165                 case FLDPLUS:
 166                         compnum++;
 167                         if (incing) {
 168                                 FPUTS(name);
 169                                 FPUTS(":");
 170                                 FPUTS(tmpbuf);
 171                         }
 172                         /*
 173                         ** if we're interested in this component, save
 174                         ** a pointer to the component text, then start
 175                         ** using our next free buffer as the component
 176                         ** temp buffer (buffer switching saves an extra
 177                         ** copy of the component text).
 178                         */
 179                         if ((cptr = wantcomp[CHASH(name)])) {
 180                                 do {
 181                                         if (!mh_strcasecmp(name, cptr->c_name)) {
 182                                                 if (! cptr->c_text) {
 183                                                         cptr->c_text = tmpbuf;
 184                                                         for (cp = tmpbuf + strlen(tmpbuf) - 1; cp >= tmpbuf; cp--)
 185                                                                 if (isspace(*cp))
 186                                                                         *cp = 0;
 187                                                                 else
 188                                                                         break;
 189                                                         *--savecomp = cptr;
 190                                                         tmpbuf = *nxtbuf++;
 191                                                 }
 192                                                 break;
 193                                         }
 194                                 } while ((cptr = cptr->c_next));
 195                         }
 196
 197                         while (state == FLDPLUS) {
 198                                 state = m_getfld(state, name, tmpbuf, SBUFSIZ,
 199                                                 inb);
 200                                 if (incing)
 201                                         FPUTS(tmpbuf);
 202                         }
 203                         break;
 204
 205                 case BODY:
 206                         compnum = -1;
 207                         if (scanfolder) {
 208                                 /* stop here if we scan a msg in a folder */
 209                                 state = FILEEOF;
 210                                 goto finished;
 211                         }
 212                         /* otherwise (mbox): snarf the body */
 213                         if (incing) {
 214                                 FPUTS("\n");
 215                                 FPUTS(tmpbuf);
 216                         }
 217 body:;
 218                         while (state == BODY) {
 219                                 state = m_getfld(state, name, tmpbuf, SBUFSIZ,
 220                                                 inb);
 221                                 if (incing) {
 222                                         FPUTS(tmpbuf);
 223                                 }
 224                         }
 225                         goto finished;
 226
 227                 case LENERR:
 228                 case FMTERR:
 229                         fprintf(stderr, innum ? "??Format error (message %d) in " : "??Format error in ", outnum ? outnum : innum);
 230                         fprintf(stderr, "component %d\n", compnum);
 231
 232                         if (incing) {
 233                                 FPUTS("\n\nBAD MSG:\n");
 234                                 FPUTS(name);
 235                                 FPUTS("\n");
 236                                 state = BODY;
 237                                 goto body;
 238                         }
 239                         /* fall through if we scan only */
 240
 241                 case FILEEOF:
 242                         goto finished;
 243
 244                 default:
 245                         adios(NULL, "getfld() returned %d", state);
 246                 }
 247         }
 248
 249 finished:
 250
 251         /* Format and output the scan line. */
 252         if (ferror(inb)) {
 253                 advise("read", "unable to");
 254                 return SCNFAT;
 255         }
 256
 257         if (incing) {
 258                 if ((dat[2] = ftell(scnout)) == EOF)
 259                         adios(scnmsg, "write error on");
 260         } else if (!scanfolder) {
 261                 if ((dat[2] = ftell(inb)) == EOF)
 262                         adios(scnmsg, "write error on");
 263                 dat[2] -= fpos;
 264         }
 265
 266         if ((datecomp && !datecomp->c_text) || scanfolder) {
 267                 struct stat st;
 268
 269                 fstat(fileno(inb), &st);
 270                 if (scanfolder)
 271                         dat[2] = st.st_size;
 272                 if (datecomp) {
 273                         if (!datecomp->c_text) {
 274                                 if (!datecomp->c_tws)
 275                                         datecomp->c_tws = (struct tws *) calloc((size_t) 1, sizeof(*datecomp->c_tws));
 276                                 if (!datecomp->c_tws)
 277                                         adios(NULL, "unable to allocate tws buffer");
 278                                 *datecomp->c_tws = *dlocaltime((time_t *) &st.st_mtime);
 279                                 datecomp->c_flags |= CF_DATEFAB|CF_TRUE;
 280                         } else {
 281                                 datecomp->c_flags &= ~CF_DATEFAB;
 282                         }
 283                 }
 284         }
 285
 286         /* print the scan line */
 287         fmt_scan(fmt, scanl, slwidth, dat);
 288         if (fmtstr)
 289                 fputs(scanl, stdout);
 290
 291         /* return dynamically allocated buffers to pool */
 292         while ((cptr = *savecomp++)) {
 293                 *--nxtbuf = cptr->c_text;
 294                 cptr->c_text = NULL;
 295         }
 296         *--nxtbuf = tmpbuf;
 297
 298         if (incing && (ferror(scnout) || fclose(scnout) == EOF))
 299                 adios(scnmsg, "write error on");
 300
 301         return (state != FILEEOF ? SCNERR : SCNMSG);
 302 }