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