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
  18 #ifdef _FSTDIO
  19 # define _ptr _p  /* Gag */
  20 # define _cnt _w  /* Wretch */
  21 #endif
  22
  23 #define MAXSCANL 256  /* longest possible scan line */
  24
  25 /*
  26 ** Buffer size for content part of header fields.  We want this
  27 ** to be large enough so that we don't do a lot of extra FLDPLUS
  28 ** calls on m_getfld.
  29 */
  30 #define SBUFSIZ 512
  31
  32 static struct format *fmt;
  33
  34 static struct comp *datecomp;  /* pntr to "date" comp */
  35 static int ncomps = 0;  /* # of interesting components */
  36 static char **compbuffers = NULL;  /* buffers for component text */
  37 static struct comp **used_buf = NULL;  /* stack for comp that use buffers */
  38
  39 static int dat[5];  /* aux. data for format routine */
  40
  41 char *scanl = NULL;  /* text of most recent scanline */
  42
  43 #define FPUTS(buf) {\
  44                 if (fputs(buf, scnout) == EOF)\
  45                         adios(scnmsg, "write error on");\
  46         }
  47
  48 /*
  49 ** prototypes
  50 */
  51 int sc_width(void);  /* from termsbr.c */
  52
  53 #ifdef MULTIBYTE_SUPPORT
  54 #define SCAN_CHARWIDTH MB_CUR_MAX
  55 #else
  56 #define SCAN_CHARWIDTH 1
  57 #endif
  58
  59 int
  60 scan(FILE *inb, int innum, int outnum, char *fmtstr, int width, int curflg,
  61         int unseen)
  62 {
  63         static int slwidth;
  64         int i, compnum, state;
  65         unsigned char *cp, *tmpbuf;
  66         char **nxtbuf;
  67         struct comp *cptr;
  68         struct comp **savecomp;
  69         char *scnmsg = NULL;
  70         FILE *scnout = NULL;
  71         char name[NAMESZ];
  72         int incing = (outnum != SCN_MBOX && outnum != SCN_FOLD);
  73         int scanfolder = (outnum == SCN_FOLD);
  74         long fpos;
  75         struct stat st;
  76
  77         /* first-time only initialization */
  78         if (!scanl) {
  79                 if (incing)
  80                         umask(~m_gmprot());
  81
  82                 if (fmtstr) {
  83                         if (width == 0) {
  84                                 if ((width = sc_width()) < WIDTH/2)
  85                                         width = WIDTH/2;
  86                                 else if (width > MAXSCANL)
  87                                         width = MAXSCANL;
  88                         }
  89                         dat[3] = slwidth = width;
  90                         scanl = (char *) mh_xmalloc((size_t) SCAN_CHARWIDTH *
  91                                         (slwidth + 2));  /* probably for \n and \0 */
  92                         /* Compile format string */
  93                         ncomps = fmt_compile(fmtstr, &fmt) + 1;
  94                         FINDCOMP(datecomp, "date");
  95                 } else {
  96                         ncomps = 1;
  97                         datecomp = NULL;
  98                 }
  99
 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         fpos = ftell(inb);
 126
 127         /*
 128         ** Get the first field.  If the message is non-empty
 129         ** and we're doing an "inc", open the output file.
 130         */
 131         if ((state = m_getfld(FLD, name, tmpbuf, SBUFSIZ, inb)) == FILEEOF) {
 132                 if (ferror(inb)) {
 133                         advise("read", "unable to"); /* "read error" */
 134                         return SCNFAT;
 135                 } else {
 136                         return SCNEOF;
 137                 }
 138         }
 139
 140         if (incing) {
 141                 scnmsg = m_name(outnum);
 142                 if (*scnmsg == '?')  /* msg num out of range */
 143                         return SCNNUM;
 144                 if (!(scnout = fopen(scnmsg, "w")))
 145                         adios(scnmsg, "unable to write");
 146         }
 147
 148         /* scan - main loop */
 149         for (compnum = 1; ;
 150                         state = m_getfld(state, name, tmpbuf, SBUFSIZ, inb)) {
 151                 switch (state) {
 152                 case FLD:
 153                 case FLDPLUS:
 154                         compnum++;
 155                         if (incing) {
 156                                 FPUTS(name);
 157                                 FPUTS(":");
 158                                 FPUTS(tmpbuf);
 159                         }
 160                         /*
 161                         ** if we're interested in this component, save
 162                         ** a pointer to the component text, then start
 163                         ** using our next free buffer as the component
 164                         ** temp buffer (buffer switching saves an extra
 165                         ** copy of the component text).
 166                         */
 167                         if (fmtstr && (cptr = wantcomp[CHASH(name)])) {
 168                                 do {
 169                                         if (mh_strcasecmp(name, cptr->c_name)!=0) {
 170                                                 continue;
 171                                         }
 172                                         if (!cptr->c_text) {
 173                                                 cptr->c_text = tmpbuf;
 174                                                 cp = tmpbuf+strlen(tmpbuf)-1;
 175                                                 for (; cp >= tmpbuf; cp--) {
 176                                                         if (isspace(*cp))
 177                                                                 *cp = '\0';
 178                                                         else
 179                                                                 break;
 180                                                 }
 181                                                 *--savecomp = cptr;
 182                                                 tmpbuf = *nxtbuf++;
 183                                         }
 184                                         break;
 185                                 } while ((cptr = cptr->c_next));
 186                         }
 187
 188                         while (state == FLDPLUS) {
 189                                 state = m_getfld(state, name, tmpbuf, SBUFSIZ,
 190                                                 inb);
 191                                 if (incing)
 192                                         FPUTS(tmpbuf);
 193                         }
 194                         break;
 195
 196                 case BODY:
 197                         compnum = -1;
 198                         if (scanfolder) {
 199                                 /* stop here if we scan a msg in a folder */
 200                                 state = FILEEOF;
 201                                 goto finished;
 202                         }
 203                         /* otherwise (mbox): snarf the body */
 204                         if (incing) {
 205                                 FPUTS("\n");
 206                                 FPUTS(tmpbuf);
 207                         }
 208 body:;
 209                         while (state == BODY) {
 210                                 state = m_getfld(state, name, tmpbuf, SBUFSIZ,
 211                                                 inb);
 212                                 if (incing) {
 213                                         FPUTS(tmpbuf);
 214                                 }
 215                         }
 216                         goto finished;
 217
 218                 case LENERR:
 219                 case FMTERR:
 220                         fprintf(stderr, innum ? "??Format error (message %d) in " : "??Format error in ", outnum ? outnum : innum);
 221                         fprintf(stderr, "component %d\n", compnum);
 222
 223                         if (incing) {
 224                                 FPUTS("\n\nBAD MSG:\n");
 225                                 FPUTS(name);
 226                                 FPUTS("\n");
 227                                 state = BODY;
 228                                 goto body;
 229                         }
 230                         /* fall through if we scan only */
 231
 232                 case FILEEOF:
 233                         goto finished;
 234
 235                 default:
 236                         adios(NULL, "getfld() returned %d", state);
 237                 }
 238         }
 239
 240 finished:
 241
 242         /* Format and output the scan line. */
 243         if (ferror(inb)) {
 244                 advise("read", "unable to");
 245                 return SCNFAT;
 246         }
 247
 248         if (incing) {
 249                 if ((dat[2] = ftell(scnout)) == EOF)
 250                         adios(scnmsg, "write error on");
 251         } else if (!scanfolder) {
 252                 if ((dat[2] = ftell(inb)) == EOF)
 253                         adios(scnmsg, "write error on");
 254                 dat[2] -= fpos;
 255         }
 256
 257         if (fmtstr) {
 258                 fstat(fileno(inb), &st);
 259                 if (scanfolder) {
 260                         dat[2] = st.st_size;
 261                 }
 262                 if (datecomp && !datecomp->c_text) {
 263                         if (!datecomp->c_text) {
 264                                 if (!datecomp->c_tws)
 265                                         datecomp->c_tws = (struct tws *) calloc((size_t) 1, sizeof(*datecomp->c_tws));
 266                                 if (!datecomp->c_tws)
 267                                         adios(NULL, "unable to allocate tws buffer");
 268                                 *datecomp->c_tws = *dlocaltime((time_t *) &st.st_mtime);
 269                                 datecomp->c_flags |= CF_DATEFAB|CF_TRUE;
 270                         } else {
 271                                 datecomp->c_flags &= ~CF_DATEFAB;
 272                         }
 273                 }
 274
 275                 /* print the scan line */
 276                 fmt_scan(fmt, scanl, slwidth, dat);
 277                 fputs(scanl, stdout);
 278         }
 279
 280         /* return dynamically allocated buffers to pool */
 281         while ((cptr = *savecomp++)) {
 282                 *--nxtbuf = cptr->c_text;
 283                 cptr->c_text = NULL;
 284         }
 285         *--nxtbuf = tmpbuf;
 286
 287         if (incing && (ferror(scnout) || fclose(scnout) == EOF))
 288                 adios(scnmsg, "write error on");
 289
 290         return (state != FILEEOF ? SCNERR : SCNMSG);
 291 }