diplodocus.org Git - nmh/blob - uip/annosbr.c

   1
   2 /*
   3  * annosbr.c -- prepend annotation to messages
   4  *
   5  * This code is Copyright (c) 2002, by the authors of nmh.  See the
   6  * COPYRIGHT file in the root directory of the nmh distribution for
   7  * complete copyright information.
   8  */
   9
  10 #include <h/mh.h>
  11 #include <h/tws.h>
  12 #include <h/utils.h>
  13 #include <fcntl.h>
  14 #include <utime.h>
  15
  16
  17 /*
  18  * static prototypes
  19  */
  20 static int annosbr (int, char *, char *, char *, int, int, int, int);
  21
  22 /*
  23  *      This "local" global and the annopreserve() function are a hack that allows additional
  24  *      functionality to be added to anno without piling on yet another annotate() argument.
  25  */
  26
  27 static  int     preserve_actime_and_modtime = 0;        /* set to preserve access and modification times on annotated message */
  28
  29 int
  30 annotate (char *file, char *comp, char *text, int inplace, int datesw, int delete, int append)
  31 {
  32     int                 i, fd;
  33     struct utimbuf      b;
  34     struct stat         s;
  35
  36     /* open and lock the file to be annotated */
  37     if ((fd = lkopendata (file, O_RDWR, 0)) == NOTOK) {
  38         switch (errno) {
  39             case ENOENT:
  40                 break;
  41
  42             default:
  43                 admonish (file, "unable to lock and open");
  44                 break;
  45         }
  46         return 1;
  47     }
  48
  49     if (stat(file, &s) == -1) {
  50         advise("can't get access and modification times for %s", file);
  51         preserve_actime_and_modtime = 0;
  52     }
  53
  54     b.actime = s.st_atime;
  55     b.modtime = s.st_mtime;
  56
  57     i = annosbr (fd, file, comp, text, inplace, datesw, delete, append);
  58
  59     if (preserve_actime_and_modtime && utime(file, &b) == -1)
  60         advise("can't set access and modification times for %s", file);
  61
  62     lkclosedata (fd, file);
  63     return i;
  64 }
  65
  66 /*
  67  *  Produce a listing of all header fields (annotations) whose field name matches
  68  *  comp.  Number the listing if number is set.  Treate the field bodies as path
  69  *  names and just output the last component unless text is non-NULL.  We don't
  70  *  care what text is set to.
  71  */
  72
  73 void
  74 annolist(char *file, char *comp, char *text, int number)
  75 {
  76     int         c;              /* current character */
  77     int         count;          /* header field (annotation) counter */
  78     char        *cp;            /* miscellaneous character pointer */
  79     char        *field;         /* buffer for header field */
  80     int         field_size;     /* size of field buffer */
  81     FILE        *fp;            /* file pointer made from locked file descriptor */
  82     int         length;         /* length of field name */
  83     int         n;              /* number of bytes written */
  84     char        *sp;            /* another miscellaneous character pointer */
  85
  86     if ((fp = fopen(file, "r")) == (FILE *)0)
  87         adios(file, "unable to open");
  88
  89     /*
  90      *  Allocate a buffer to hold the header components as they're read in.
  91      *  This buffer might need to be quite large, so we grow it as needed.
  92      */
  93
  94     field = (char *)mh_xmalloc(field_size = 256);
  95
  96     /*
  97      *  Get the length of the field name since we use it often.
  98      */
  99
 100     length = strlen(comp);
 101
 102     count = 0;
 103
 104     do {
 105         /*
 106          *      Get a line from the input file, growing the field buffer as needed.  We do this
 107          *      so that we can fit an entire line in the buffer making it easy to do a string
 108          *      comparison on both the field name and the field body which might be a long path
 109          *      name.
 110          */
 111
 112         for (n = 0, cp = field; (c = getc(fp)) != EOF; *cp++ = c) {
 113             if (c == '\n' && (c = getc(fp)) != ' ' && c != '\t') {
 114                 (void)ungetc(c, fp);
 115                 c = '\n';
 116                 break;
 117             }
 118
 119             if (++n >= field_size - 1) {
 120                 field = (char *) mh_xrealloc((void *)field, field_size += 256);
 121
 122                 cp = field + n - 1;
 123             }
 124         }
 125
 126         /*
 127          *      NUL-terminate the field..
 128          */
 129
 130         *cp = '\0';
 131
 132         if (strncasecmp(field, comp, length) == 0 && field[length] == ':') {
 133             for (cp = field + length + 1; *cp == ' ' || *cp == '\t'; cp++)
 134                 ;
 135
 136             if (number)
 137                 (void)printf("%d\t", ++count);
 138
 139             if (text == (char *)0 && (sp = strrchr(cp, '/')) != (char *)0)
 140                 cp = sp + 1;
 141
 142             (void)printf("%s\n", cp);
 143         }
 144
 145     } while (*field != '\0' && *field != '-');
 146
 147     /*
 148      *  Clean up.
 149      */
 150
 151     free(field);
 152
 153     (void)fclose(fp);
 154
 155     return;
 156 }
 157
 158 /*
 159  *      Set the preserve-times flag.  This hack eliminates the need for an additional argument to annotate().
 160  */
 161
 162 void
 163 annopreserve(int preserve)
 164 {
 165         preserve_actime_and_modtime = preserve;
 166         return;
 167 }
 168
 169 static int
 170 annosbr (int fd, char *file, char *comp, char *text, int inplace, int datesw, int delete, int append)
 171 {
 172     int mode, tmpfd;
 173     char *cp, *sp;
 174     char buffer[BUFSIZ], tmpfil[BUFSIZ];
 175     struct stat st;
 176     FILE        *tmp;
 177     int         c;              /* current character */
 178     int         count;          /* header field (annotation) counter */
 179     char        *field = NULL;  /* buffer for header field */
 180     int         field_size = 0; /* size of field buffer */
 181     FILE        *fp = NULL;     /* file pointer made from locked file descriptor */
 182     int         length;         /* length of field name */
 183     int         n;              /* number of bytes written */
 184
 185     mode = fstat (fd, &st) != NOTOK ? (int) (st.st_mode & 0777) : m_gmprot ();
 186
 187     strncpy (tmpfil, m_mktemp2(file, "annotate", NULL, &tmp), sizeof(tmpfil));
 188     chmod (tmpfil, mode);
 189
 190     /*
 191      *  We're going to need to copy some of the message file to the temporary
 192      *  file while examining the contents.  Convert the message file descriptor
 193      *  to a file pointer since it's a lot easier and more efficient to use
 194      *  stdio for this.  Also allocate a buffer to hold the header components
 195      *  as they're read in.  This buffer is grown as needed later.
 196      */
 197
 198     if (delete >= -1 || append != 0) {
 199         if ((fp = fdopen(fd, "r")) == (FILE *)0)
 200             adios(NULL, "unable to fdopen file.");
 201
 202         field = (char *)mh_xmalloc(field_size = 256);
 203     }
 204
 205     /*
 206      *  We're trying to delete a header field (annotation )if the delete flag is
 207      *  not -2 or less.  A  value greater than zero means that we're deleting the
 208      *  nth header field that matches the field (component) name.  A value of
 209      *  zero means that we're deleting the first field in which both the field
 210      *  name matches the component name and the field body matches the text.
 211      *  The text is matched in its entirety if it begins with a slash; otherwise
 212      *  the text is matched against whatever portion of the field body follows
 213      *  the last slash.  This allows matching of both absolute and relative path
 214      *  names.  This is because this functionality was added to support attachments.
 215      *  It might be worth having a separate flag to indicate path name matching to
 216      *  make it more general.  A value of -1 means to delete all matching fields.
 217      */
 218
 219     if (delete >= -1) {
 220         /*
 221          *  Get the length of the field name since we use it often.
 222          */
 223
 224         length = strlen(comp);
 225
 226         /*
 227          *  Initialize the field counter.  This is only used if we're deleting by
 228          *  number.
 229          */
 230
 231         count = 0;
 232
 233         /*
 234          *  Copy lines from the input file to the temporary file until we either find the one
 235          *  that we're looking for (which we don't copy) or we reach the end of the headers.
 236          *  Both a blank line and a line beginning with a - terminate the headers so that we
 237          *  can handle both drafts and RFC-2822 format messages.
 238          */
 239
 240         do {
 241             /*
 242              *  Get a line from the input file, growing the field buffer as needed.  We do this
 243              *  so that we can fit an entire line in the buffer making it easy to do a string
 244              *  comparison on both the field name and the field body which might be a long path
 245              *  name.
 246              */
 247
 248             for (n = 0, cp = field; (c = getc(fp)) != EOF; *cp++ = c) {
 249                 if (c == '\n' && (c = getc(fp)) != ' ' && c != '\t') {
 250                     (void)ungetc(c, fp);
 251                     c = '\n';
 252                     break;
 253                 }
 254
 255                 if (++n >= field_size - 1) {
 256                     field = (char *) mh_xrealloc((void *)field, field_size *= 2);
 257
 258                     cp = field + n - 1;
 259                 }
 260             }
 261
 262             /*
 263              *  NUL-terminate the field..
 264              */
 265
 266             *cp = '\0';
 267
 268             /*
 269              *  Check for a match on the field name.  We delete the line by not copying it to the
 270              *  temporary file if
 271              *
 272              *   o  The delete flag is 0, meaning that we're going to delete the first matching
 273              *      field, and the text is NULL meaning that we don't care about the field body.
 274              *
 275              *   o  The delete flag is 0, meaning that we're going to delete the first matching
 276              *      field, and the text begins with a / meaning that we're looking for a full
 277              *      path name, and the text matches the field body.
 278              *
 279              *   o  The delete flag is 0, meaning that we're going to delete the first matching
 280              *      field, the text does not begin with a / meaning that we're looking for the
 281              *      last path name component, and the last path name component matches the text.
 282              *
 283              *   o  The delete flag is positive meaning that we're going to delete the nth field
 284              *      with a matching field name, and this is the nth matching field name.
 285              *
 286              *   o  The delete flag is -1 meaning that we're going to delete all fields with a
 287              *      matching field name.
 288              */
 289
 290             if (strncasecmp(field, comp, length) == 0 && field[length] == ':') {
 291                 if (delete == 0) {
 292                     if (text == (char *)0)
 293                         break;
 294
 295                     for (cp = field + length + 1; *cp == ' ' || *cp == '\t'; cp++)
 296                         ;
 297
 298                     if (*text == '/') {
 299                         if (strcmp(cp, text) == 0)
 300                                 break;
 301                     }
 302                     else {
 303                         if ((sp = strrchr(cp, '/')) != (char *)0)
 304                             cp = sp + 1;
 305
 306                         if (strcmp(cp, text) == 0)
 307                             break;
 308                     }
 309                 }
 310
 311                 else if (delete == -1)
 312                         continue;
 313
 314                 else if (++count == delete)
 315                     break;
 316             }
 317
 318             /*
 319              *  This line wasn't a match so copy it to the temporary file.
 320              */
 321
 322             if ((n = fputs(field, tmp)) == EOF || (c == '\n' && fputc('\n', tmp) == EOF))
 323                 adios(NULL, "unable to write temporary file.");
 324
 325         } while (*field != '\0' && *field != '-');
 326
 327         /*
 328          *  Get rid of the field buffer because we're done with it.
 329          */
 330
 331         free((void *)field);
 332     }
 333
 334     else {
 335         /*
 336          *  Find the end of the headers before adding the annotations if we're
 337          *  appending instead of the default prepending.  A special check for
 338          *  no headers is needed if appending.
 339          */
 340
 341         if (append) {
 342             /*
 343              *  Copy lines from the input file to the temporary file until we
 344              *  reach the end of the headers.
 345              */
 346
 347             if ((c = getc(fp)) == '\n')
 348                 rewind(fp);
 349
 350             else {
 351                 (void)putc(c, tmp);
 352
 353                 while ((c = getc(fp)) != EOF) {
 354                     (void)putc(c, tmp);
 355
 356                     if (c == '\n') {
 357                         (void)ungetc(c = getc(fp), fp);
 358
 359                         if (c == '\n' || c == '-')
 360                             break;
 361                     }
 362                 }
 363             }
 364         }
 365
 366         if (datesw)
 367             fprintf (tmp, "%s: %s\n", comp, dtimenow (0));
 368         if ((cp = text)) {
 369             do {
 370                 while (*cp == ' ' || *cp == '\t')
 371                     cp++;
 372                 sp = cp;
 373                 while (*cp && *cp++ != '\n')
 374                     continue;
 375                 if (cp - sp)
 376                     fprintf (tmp, "%s: %*.*s", comp, (int)(cp - sp), (int)(cp - sp), sp);
 377             } while (*cp);
 378             if (cp[-1] != '\n' && cp != text)
 379                 putc ('\n', tmp);
 380         }
 381     }
 382
 383     fflush (tmp);
 384
 385     /*
 386      *  We've been messing with the input file position.  Move the input file
 387      *  descriptor to the current place in the file because the stock data
 388      *  copying routine uses the descriptor, not the pointer.
 389      */
 390
 391     if (append || delete >= -1) {
 392         if (lseek(fd, (off_t)ftell(fp), SEEK_SET) == (off_t)-1)
 393             adios(NULL, "can't seek.");
 394     }
 395
 396     cpydata (fd, fileno (tmp), file, tmpfil);
 397     fclose (tmp);
 398
 399     if (inplace) {
 400         if ((tmpfd = open (tmpfil, O_RDONLY)) == NOTOK)
 401             adios (tmpfil, "unable to open for re-reading");
 402
 403         lseek (fd, (off_t) 0, SEEK_SET);
 404
 405         /*
 406          *  We're making the file shorter if we're deleting a header field
 407          *  so the file has to be truncated or it will contain garbage.
 408          */
 409
 410         if (delete >= -1 && ftruncate(fd, 0) == -1)
 411             adios(tmpfil, "unable to truncate.");
 412
 413         cpydata (tmpfd, fd, tmpfil, file);
 414         close (tmpfd);
 415         unlink (tmpfil);
 416     } else {
 417         strncpy (buffer, m_backup (file), sizeof(buffer));
 418         if (rename (file, buffer) == NOTOK) {
 419             switch (errno) {
 420                 case ENOENT:    /* unlinked early - no annotations */
 421                     unlink (tmpfil);
 422                     break;
 423
 424                 default:
 425                     admonish (buffer, "unable to rename %s to", file);
 426                     break;
 427             }
 428             return 1;
 429         }
 430         if (rename (tmpfil, file) == NOTOK) {
 431             admonish (file, "unable to rename %s to", tmpfil);
 432             return 1;
 433         }
 434     }
 435
 436     /*
 437      *  Close the delete file so that we don't run out of file pointers if
 438      *  we're doing piles of files.  Note that this will make the close() in
 439      *  lkclose() fail, but that failure is ignored so it's not a problem.
 440      */
 441
 442     if (delete >= -1)
 443         (void)fclose(fp);
 444
 445     return 0;
 446 }