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 #define MAXSCANL 256  /* longest possible scan line */
  22
  23 /*
  24 ** Buffer size for content part of header fields.  We want this
  25 ** to be large enough so that we don't do a lot of extra FLDPLUS
  26 ** calls on m_getfld.
  27 */
  28 #define SBUFSIZ 512
  29
  30 static struct format *fmt;
  31
  32 static struct comp *datecomp;  /* pntr to "date" comp */
  33 static int ncomps = 0;  /* # of interesting components */
  34 static char **compbuffers = NULL;  /* buffers for component text */
  35 static struct comp **used_buf = NULL;  /* stack for comp that use buffers */
  36
  37 static int dat[5];  /* aux. data for format routine */
  38
  39 char *scanl = NULL;  /* text of most recent scanline */
  40
  41 #define FPUTS(buf) {\
  42                 if (fputs(buf, scnout) == EOF)\
  43                         adios(scnmsg, "write error on");\
  44         }
  45
  46 /*
  47 ** prototypes
  48 */
  49 int sc_width(void);  /* from termsbr.c */
  50
  51 #ifdef MULTIBYTE_SUPPORT
  52 #define SCAN_CHARWIDTH MB_CUR_MAX
  53 #else
  54 #define SCAN_CHARWIDTH 1
  55 #endif
  56
  57 int
  58 scan(FILE *inb, int innum, int outnum, char *fmtstr, int width, int curflg,
  59         int unseen)
  60 {
  61         static int slwidth;
  62         int i, compnum, state;
  63         unsigned char *cp, *tmpbuf;
  64         char **nxtbuf;
  65         struct comp *cptr;
  66         struct comp **savecomp;
  67         char *scnmsg = NULL;
  68         FILE *scnout = NULL;
  69         char name[NAMESZ];
  70         int incing = (outnum != SCN_MBOX && outnum != SCN_FOLD);
  71         int scanfolder = (outnum == SCN_FOLD);
  72         long fpos;
  73         struct stat st;
  74
  75         /* first-time only initialization */
  76         if (!scanl) {
  77                 if (incing)
  78                         umask(~m_gmprot());
  79
  80                 if (fmtstr) {
  81                         if (width == 0) {
  82                                 if ((width = sc_width()) < WIDTH/2)
  83                                         width = WIDTH/2;
  84                                 else if (width > MAXSCANL)
  85                                         width = MAXSCANL;
  86                         }
  87                         dat[3] = slwidth = width;
  88                         scanl = (char *) mh_xmalloc((size_t) SCAN_CHARWIDTH *
  89                                         (slwidth + 2));  /* probably for \n and \0 */
  90                         /* Compile format string */
  91                         ncomps = fmt_compile(fmtstr, &fmt) + 1;
  92                         FINDCOMP(datecomp, "date");
  93                 } else {
  94                         ncomps = 1;
  95                         datecomp = NULL;
  96                 }
  97
  98                 nxtbuf = compbuffers = (char **) calloc((size_t) ncomps,
  99                                 sizeof(char *));
 100                 if (!nxtbuf)
 101                         adios(NULL, "unable to allocate component buffers");
 102                 used_buf = (struct comp **) calloc((size_t) (ncomps+1),
 103                                 sizeof(struct comp *));
 104                 if (!used_buf)
 105                         adios(NULL, "unable to allocate component buffer stack");
 106                 /* NULL-terminate array */
 107                 used_buf += ncomps;
 108                 *used_buf = NULL;
 109                 /* allocate space for the items */
 110                 for (i = ncomps; i--; )
 111                         *nxtbuf++ = mh_xmalloc(SBUFSIZ);
 112         }
 113
 114         /*
 115         ** each-message initialization
 116         */
 117         nxtbuf = compbuffers;
 118         savecomp = used_buf;
 119         tmpbuf = *nxtbuf++;
 120         dat[0] = innum ? innum : outnum;
 121         dat[1] = curflg;
 122         dat[4] = unseen;
 123         fpos = ftell(inb);
 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")))
 143                         adios(scnmsg, "unable to write");
 144         }
 145
 146         /* scan - main loop */
 147         for (compnum = 1; ;
 148                         state = m_getfld(state, name, tmpbuf, SBUFSIZ, inb)) {
 149                 switch (state) {
 150                 case FLD:
 151                 case FLDPLUS:
 152                         compnum++;
 153                         if (incing) {
 154                                 FPUTS(name);
 155                                 FPUTS(":");
 156                                 FPUTS(tmpbuf);
 157                         }
 158                         /*
 159                         ** if we're interested in this component, save
 160                         ** a pointer to the component text, then start
 161                         ** using our next free buffer as the component
 162                         ** temp buffer (buffer switching saves an extra
 163                         ** copy of the component text).
 164                         */
 165                         if (fmtstr && (cptr = wantcomp[CHASH(name)])) {
 166                                 do {
 167                                         if (mh_strcasecmp(name, cptr->c_name)!=0) {
 168                                                 continue;
 169                                         }
 170                                         if (!cptr->c_text) {
 171                                                 cptr->c_text = tmpbuf;
 172                                                 cp = tmpbuf+strlen(tmpbuf)-1;
 173                                                 for (; cp >= tmpbuf; cp--) {
 174                                                         if (isspace(*cp))
 175                                                                 *cp = '\0';
 176                                                         else
 177                                                                 break;
 178                                                 }
 179                                                 *--savecomp = cptr;
 180                                                 tmpbuf = *nxtbuf++;
 181                                         }
 182                                         break;
 183                                 } while ((cptr = cptr->c_next));
 184                         }
 185
 186                         while (state == FLDPLUS) {
 187                                 state = m_getfld(state, name, tmpbuf, SBUFSIZ,
 188                                                 inb);
 189                                 if (incing)
 190                                         FPUTS(tmpbuf);
 191                         }
 192                         break;
 193
 194                 case BODY:
 195                         compnum = -1;
 196                         if (scanfolder) {
 197                                 /* stop here if we scan a msg in a folder */
 198                                 state = FILEEOF;
 199                                 goto finished;
 200                         }
 201                         /* otherwise (mbox): snarf the body */
 202                         if (incing) {
 203                                 FPUTS("\n");
 204                                 FPUTS(tmpbuf);
 205                         }
 206 body:;
 207                         while (state == BODY) {
 208                                 state = m_getfld(state, name, tmpbuf, SBUFSIZ,
 209                                                 inb);
 210                                 if (incing) {
 211                                         FPUTS(tmpbuf);
 212                                 }
 213                         }
 214                         goto finished;
 215
 216                 case LENERR:
 217                 case FMTERR:
 218                         fprintf(stderr, innum ? "??Format error (message %d) in " : "??Format error in ", outnum ? outnum : innum);
 219                         fprintf(stderr, "component %d\n", compnum);
 220
 221                         if (incing) {
 222                                 FPUTS("\n\nBAD MSG:\n");
 223                                 FPUTS(name);
 224                                 FPUTS("\n");
 225                                 state = BODY;
 226                                 goto body;
 227                         }
 228                         /* fall through if we scan only */
 229
 230                 case FILEEOF:
 231                         goto finished;
 232
 233                 default:
 234                         adios(NULL, "getfld() returned %d", state);
 235                 }
 236         }
 237
 238 finished:
 239
 240         /* Format and output the scan line. */
 241         if (ferror(inb)) {
 242                 advise("read", "unable to");
 243                 return SCNFAT;
 244         }
 245
 246         if (incing) {
 247                 if ((dat[2] = ftell(scnout)) == EOF)
 248                         adios(scnmsg, "write error on");
 249         } else if (!scanfolder) {
 250                 if ((dat[2] = ftell(inb)) == EOF)
 251                         adios(scnmsg, "write error on");
 252                 dat[2] -= fpos;
 253         }
 254
 255         if (fmtstr) {
 256                 fstat(fileno(inb), &st);
 257                 if (scanfolder) {
 258                         dat[2] = st.st_size;
 259                 }
 260                 if (datecomp && !datecomp->c_text) {
 261                         if (!datecomp->c_text) {
 262                                 if (!datecomp->c_tws)
 263                                         datecomp->c_tws = (struct tws *) calloc((size_t) 1, sizeof(*datecomp->c_tws));
 264                                 if (!datecomp->c_tws)
 265                                         adios(NULL, "unable to allocate tws buffer");
 266                                 *datecomp->c_tws = *dlocaltime((time_t *) &st.st_mtime);
 267                                 datecomp->c_flags |= CF_DATEFAB|CF_TRUE;
 268                         } else {
 269                                 datecomp->c_flags &= ~CF_DATEFAB;
 270                         }
 271                 }
 272
 273                 /* print the scan line */
 274                 fmt_scan(fmt, scanl, slwidth, dat);
 275                 fputs(scanl, stdout);
 276         }
 277
 278         /* return dynamically allocated buffers to pool */
 279         while ((cptr = *savecomp++)) {
 280                 *--nxtbuf = cptr->c_text;
 281                 cptr->c_text = NULL;
 282         }
 283         *--nxtbuf = tmpbuf;
 284
 285         if (incing && (ferror(scnout) || fclose(scnout) == EOF))
 286                 adios(scnmsg, "write error on");
 287
 288         return (state != FILEEOF ? SCNERR : SCNMSG);
 289 }