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 #include <ctype.h>
  16 #include <sys/stat.h>
  17 #include <sysexits.h>
  18
  19 #ifdef _FSTDIO
  20 # define _ptr _p  /* Gag */
  21 # define _cnt _w  /* Wretch */
  22 #endif
  23
  24 #define MAXSCANL 256  /* longest possible scan line */
  25
  26 /*
  27 ** Buffer size for content part of header fields.  We want this
  28 ** to be large enough so that we don't do a lot of extra FLDPLUS
  29 ** calls on m_getfld.
  30 */
  31 #define SBUFSIZ 512
  32
  33 static struct format *fmt;
  34
  35 static struct comp *datecomp;  /* pntr to "date" comp */
  36 static int ncomps = 0;  /* # of interesting components */
  37 static char **compbuffers = NULL;  /* buffers for component text */
  38 static struct comp **used_buf = NULL;  /* stack for comp that use buffers */
  39
  40 static int dat[5];  /* aux. data for format routine */
  41
  42 char *scanl = NULL;  /* text of most recent scanline */
  43
  44 #define FPUTS(buf) {\
  45                 if (fputs(buf, scnout) == EOF)\
  46                         adios(EX_IOERR, scnmsg, "write error on");\
  47         }
  48
  49 /*
  50 ** prototypes
  51 */
  52 int sc_width(void);  /* from termsbr.c */
  53
  54 #ifdef MULTIBYTE_SUPPORT
  55 #define SCAN_CHARWIDTH MB_CUR_MAX
  56 #else
  57 #define SCAN_CHARWIDTH 1
  58 #endif
  59
  60 int
  61 scan(FILE *inb, int innum, int outnum, char *fmtstr, int width, int curflg,
  62         int unseen)
  63 {
  64         static int slwidth;
  65         int i, compnum, state;
  66         unsigned char *cp, *tmpbuf;
  67         char **nxtbuf;
  68         struct comp *cptr;
  69         struct comp **savecomp;
  70         char *scnmsg = NULL;
  71         FILE *scnout = NULL;
  72         char name[NAMESZ];
  73         int incing = (outnum != SCN_MBOX && outnum != SCN_FOLD);
  74         int scanfolder = (outnum == SCN_FOLD);
  75         long fpos;
  76         struct stat st;
  77
  78         /* first-time only initialization */
  79         if (!scanl) {
  80                 if (incing)
  81                         umask(~m_gmprot());
  82
  83                 if (fmtstr) {
  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                         /* Compile format string */
  94                         ncomps = fmt_compile(fmtstr, &fmt) + 1;
  95                         FINDCOMP(datecomp, "date");
  96                 } else {
  97                         ncomps = 1;
  98                         datecomp = NULL;
  99                 }
 100
 101                 nxtbuf = compbuffers = (char **) calloc((size_t) ncomps,
 102                                 sizeof(char *));
 103                 if (!nxtbuf)
 104                         adios(EX_OSERR, 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(EX_OSERR, 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(EX_IOERR, scnmsg, "unable to write");
 147         }
 148
 149         /* scan - main loop */
 150         for (compnum = 1; ;
 151                         state = m_getfld(state, name, tmpbuf, SBUFSIZ, inb)) {
 152                 switch (state) {
 153                 case FLD:
 154                 case FLDPLUS:
 155                         compnum++;
 156                         if (incing) {
 157                                 FPUTS(name);
 158                                 FPUTS(":");
 159                                 FPUTS(tmpbuf);
 160                         }
 161                         /*
 162                         ** if we're interested in this component, save
 163                         ** a pointer to the component text, then start
 164                         ** using our next free buffer as the component
 165                         ** temp buffer (buffer switching saves an extra
 166                         ** copy of the component text).
 167                         */
 168                         if (fmtstr && (cptr = wantcomp[CHASH(name)])) {
 169                                 do {
 170                                         if (mh_strcasecmp(name, cptr->c_name)!=0) {
 171                                                 continue;
 172                                         }
 173                                         if (!cptr->c_text) {
 174                                                 cptr->c_text = tmpbuf;
 175                                                 cp = tmpbuf+strlen(tmpbuf)-1;
 176                                                 for (; cp >= tmpbuf; cp--) {
 177                                                         if (isspace(*cp))
 178                                                                 *cp = '\0';
 179                                                         else
 180                                                                 break;
 181                                                 }
 182                                                 *--savecomp = cptr;
 183                                                 tmpbuf = *nxtbuf++;
 184                                         }
 185                                         break;
 186                                 } while ((cptr = cptr->c_next));
 187                         }
 188
 189                         while (state == FLDPLUS) {
 190                                 state = m_getfld(state, name, tmpbuf, SBUFSIZ,
 191                                                 inb);
 192                                 if (incing)
 193                                         FPUTS(tmpbuf);
 194                         }
 195                         break;
 196
 197                 case BODY:
 198                         compnum = -1;
 199                         if (scanfolder) {
 200                                 /* stop here if we scan a msg in a folder */
 201                                 state = FILEEOF;
 202                                 goto finished;
 203                         }
 204                         /* otherwise (mbox): snarf the body */
 205                         if (incing) {
 206                                 FPUTS("\n");
 207                                 FPUTS(tmpbuf);
 208                         }
 209 body:;
 210                         while (state == BODY) {
 211                                 state = m_getfld(state, name, tmpbuf, SBUFSIZ,
 212                                                 inb);
 213                                 if (incing) {
 214                                         FPUTS(tmpbuf);
 215                                 }
 216                         }
 217                         goto finished;
 218
 219                 case LENERR:
 220                 case FMTERR:
 221                         fprintf(stderr, innum ? "??Format error (message %d) in " : "??Format error in ", outnum ? outnum : innum);
 222                         fprintf(stderr, "component %d\n", compnum);
 223
 224                         if (incing) {
 225                                 FPUTS("\n\nBAD MSG:\n");
 226                                 FPUTS(name);
 227                                 FPUTS("\n");
 228                                 state = BODY;
 229                                 goto body;
 230                         }
 231                         /* fall through if we scan only */
 232
 233                 case FILEEOF:
 234                         goto finished;
 235
 236                 default:
 237                         adios(EX_SOFTWARE, NULL, "getfld() returned %d", state);
 238                 }
 239         }
 240
 241 finished:
 242
 243         /* Format and output the scan line. */
 244         if (ferror(inb)) {
 245                 advise("read", "unable to");
 246                 return SCNFAT;
 247         }
 248
 249         if (incing) {
 250                 if ((dat[2] = ftell(scnout)) == EOF)
 251                         adios(EX_IOERR, scnmsg, "write error on");
 252         } else if (!scanfolder) {
 253                 if ((dat[2] = ftell(inb)) == EOF)
 254                         adios(EX_IOERR, scnmsg, "write error on");
 255                 dat[2] -= fpos;
 256         }
 257
 258         if (fmtstr) {
 259                 fstat(fileno(inb), &st);
 260                 if (scanfolder) {
 261                         dat[2] = st.st_size;
 262                 }
 263                 if (datecomp && !datecomp->c_text) {
 264                         if (!datecomp->c_text) {
 265                                 if (!datecomp->c_tws)
 266                                         datecomp->c_tws = (struct tws *) calloc((size_t) 1, sizeof(*datecomp->c_tws));
 267                                 if (!datecomp->c_tws)
 268                                         adios(EX_OSERR, NULL, "unable to allocate tws buffer");
 269                                 *datecomp->c_tws = *dlocaltime((time_t *) &st.st_mtime);
 270                                 datecomp->c_flags |= CF_DATEFAB|CF_TRUE;
 271                         } else {
 272                                 datecomp->c_flags &= ~CF_DATEFAB;
 273                         }
 274                 }
 275
 276                 /* print the scan line */
 277                 fmt_scan(fmt, scanl, slwidth, dat);
 278                 fputs(scanl, stdout);
 279         }
 280
 281         /* return dynamically allocated buffers to pool */
 282         while ((cptr = *savecomp++)) {
 283                 *--nxtbuf = cptr->c_text;
 284                 cptr->c_text = NULL;
 285         }
 286         *--nxtbuf = tmpbuf;
 287
 288         if (incing && (ferror(scnout) || fclose(scnout) == EOF))
 289                 adios(EX_IOERR, scnmsg, "write error on");
 290
 291         return (state != FILEEOF ? SCNERR : SCNMSG);
 292 }