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

   1
   2 /*
   3  * annosbr.c -- prepend annotation to messages
   4  *
   5  * $Id$
   6  *
   7  * This code is Copyright (c) 2002, by the authors of nmh.  See the
   8  * COPYRIGHT file in the root directory of the nmh distribution for
   9  * complete copyright information.
  10  */
  11
  12 #include <h/mh.h>
  13 #include <h/tws.h>
  14 #include <fcntl.h>
  15 #include <errno.h>
  16 #include <utime.h>
  17
  18
  19 /*
  20  * static prototypes
  21  */
  22 static int annosbr (int, char *, char *, char *, int, int, int, int);
  23
  24 /*
  25  *      This "local" global and the annopreserve() function are a hack that allows additional
  26  *      functionality to be added to anno without piling on yet another annotate() argument.
  27  */
  28
  29 static  int     preserve_actime_and_modtime = 0;        /* set to preserve access and modification times on annotated message */
  30
  31 int
  32 annotate (char *file, char *comp, char *text, int inplace, int datesw, int delete, int append)
  33 {
  34     int                 i, fd;
  35     struct utimbuf      b;
  36     struct stat         s;
  37
  38     /* open and lock the file to be annotated */
  39     if ((fd = lkopen (file, O_RDWR, 0)) == NOTOK) {
  40         switch (errno) {
  41             case ENOENT:
  42                 break;
  43
  44             default:
  45                 admonish (file, "unable to lock and open");
  46                 break;
  47         }
  48         return 1;
  49     }
  50
  51     if (stat(file, &s) == -1) {
  52         advise("can't get access and modification times for %s", file);
  53         preserve_actime_and_modtime = 0;
  54     }
  55
  56     b.actime = s.st_atime;
  57     b.modtime = s.st_mtime;
  58
  59     i = annosbr (fd, file, comp, text, inplace, datesw, delete, append);
  60
  61     if (preserve_actime_and_modtime && utime(file, &b) == -1)
  62         advise("can't set access and modification times for %s", file);
  63
  64     lkclose (fd, file);
  65     return i;
  66 }
  67
  68 /*
  69  *  Produce a listing of all header fields (annotations) whose field name matches
  70  *  comp.  Number the listing if number is set.  Treate the field bodies as path
  71  *  names and just output the last component unless text is non-NULL.  We don't
  72  *  care what text is set to.
  73  */
  74
  75 void
  76 annolist(char *file, char *comp, char *text, int number)
  77 {
  78     int         c;              /* current character */
  79     int         count;          /* header field (annotation) counter */
  80     char        *cp;            /* miscellaneous character pointer */
  81     char        *field;         /* buffer for header field */
  82     int         field_size;     /* size of field buffer */
  83     FILE        *fp;            /* file pointer made from locked file descriptor */
  84     int         length;         /* length of field name */
  85     int         n;              /* number of bytes written */
  86     char        *sp;            /* another miscellaneous character pointer */
  87
  88     if ((fp = fopen(file, "r")) == (FILE *)0)
  89         adios(file, "unable to open");
  90
  91     /*
  92      *  Allocate a buffer to hold the header components as they're read in.
  93      *  This buffer might need to be quite large, so we grow it as needed.
  94      */
  95
  96     if ((field = (char *)malloc(field_size = 256)) == (char *)0)
  97         adios(NULL, "can't allocate field buffer.");
  98
  99     /*
 100      *  Get the length of the field name since we use it often.
 101      */
 102
 103     length = strlen(comp);
 104
 105     count = 0;
 106
 107     do {
 108         /*
 109          *      Get a line from the input file, growing the field buffer as needed.  We do this
 110          *      so that we can fit an entire line in the buffer making it easy to do a string
 111          *      comparison on both the field name and the field body which might be a long path
 112          *      name.
 113          */
 114
 115         for (n = 0, cp = field; (c = getc(fp)) != EOF; *cp++ = c) {
 116             if (c == '\n' && (c = getc(fp)) != ' ' && c != '\t') {
 117                 (void)ungetc(c, fp);
 118                 c = '\n';
 119                 break;
 120             }
 121
 122             if (++n >= field_size - 1) {
 123                 if ((field = (char *)realloc((void *)field, field_size += 256)) == (char *)0)
 124                     adios(NULL, "can't grow field buffer.");
 125
 126                 cp = field + n - 1;
 127             }
 128         }
 129
 130         /*
 131          *      NUL-terminate the field..
 132          */
 133
 134         *cp = '\0';
 135
 136         if (strncasecmp(field, comp, length) == 0 && field[length] == ':') {
 137             for (cp = field + length + 1; *cp == ' ' || *cp == '\t'; cp++)
 138                 ;
 139
 140             if (number)
 141                 (void)printf("%d\t", ++count);
 142
 143             if (text == (char *)0 && (sp = strrchr(cp, '/')) != (char *)0)
 144                 cp = sp + 1;
 145
 146             (void)printf("%s\n", cp);
 147         }
 148
 149     } while (*field != '\0' && *field != '-');
 150
 151     /*
 152      *  Clean up.
 153      */
 154
 155     free(field);
 156
 157     (void)fclose(fp);
 158
 159     return;
 160 }
 161
 162 /*
 163  *      Set the preserve-times flag.  This hack eliminates the need for an additional argument to annotate().
 164  */
 165
 166 void
 167 annopreserve(int preserve)
 168 {
 169         preserve_actime_and_modtime = preserve;
 170         return;
 171 }
 172
 173 static int
 174 annosbr (int fd, char *file, char *comp, char *text, int inplace, int datesw, int delete, int append)
 175 {
 176     int mode, tmpfd;
 177     char *cp, *sp;
 178     char buffer[BUFSIZ], tmpfil[BUFSIZ];
 179     struct stat st;
 180     FILE        *tmp;
 181     int         c;              /* current character */
 182     int         count;          /* header field (annotation) counter */
 183     char        *field;         /* buffer for header field */
 184     int         field_size;     /* size of field buffer */
 185     FILE        *fp;            /* file pointer made from locked file descriptor */
 186     int         length;         /* length of field name */
 187     int         n;              /* number of bytes written */
 188
 189     mode = fstat (fd, &st) != NOTOK ? (st.st_mode & 0777) : m_gmprot ();
 190
 191     strncpy (tmpfil, m_scratch (file, "annotate"), sizeof(tmpfil));
 192
 193     if ((tmp = fopen (tmpfil, "w")) == NULL) {
 194         admonish (tmpfil, "unable to create");
 195         return 1;
 196     }
 197     chmod (tmpfil, mode);
 198
 199     /*
 200      *  We're going to need to copy some of the message file to the temporary
 201      *  file while examining the contents.  Convert the message file descriptor
 202      *  to a file pointer since it's a lot easier and more efficient to use
 203      *  stdio for this.  Also allocate a buffer to hold the header components
 204      *  as they're read in.  This buffer is grown as needed later.
 205      */
 206
 207     if (delete >= -1 || append != 0) {
 208         if ((fp = fdopen(fd, "r")) == (FILE *)0)
 209             adios(NULL, "unable to fdopen file.");
 210
 211         if ((field = (char *)malloc(field_size = 256)) == (char *)0)
 212             adios(NULL, "can't allocate field buffer.");
 213     }
 214
 215     /*
 216      *  We're trying to delete a header field (annotation )if the delete flag is
 217      *  not -2 or less.  A  value greater than zero means that we're deleting the
 218      *  nth header field that matches the field (component) name.  A value of
 219      *  zero means that we're deleting the first field in which both the field
 220      *  name matches the component name and the field body matches the text.
 221      *  The text is matched in its entirety if it begins with a slash; otherwise
 222      *  the text is matched against whatever portion of the field body follows
 223      *  the last slash.  This allows matching of both absolute and relative path
 224      *  names.  This is because this functionality was added to support attachments.
 225      *  It might be worth having a separate flag to indicate path name matching to
 226      *  make it more general.  A value of -1 means to delete all matching fields.
 227      */
 228
 229     if (delete >= -1) {
 230         /*
 231          *  Get the length of the field name since we use it often.
 232          */
 233
 234         length = strlen(comp);
 235
 236         /*
 237          *  Initialize the field counter.  This is only used if we're deleting by
 238          *  number.
 239          */
 240
 241         count = 0;
 242
 243         /*
 244          *  Copy lines from the input file to the temporary file until we either find the one
 245          *  that we're looking for (which we don't copy) or we reach the end of the headers.
 246          *  Both a blank line and a line beginning with a - terminate the headers so that we
 247          *  can handle both drafts and RFC-2822 format messages.
 248          */
 249
 250         do {
 251             /*
 252              *  Get a line from the input file, growing the field buffer as needed.  We do this
 253              *  so that we can fit an entire line in the buffer making it easy to do a string
 254              *  comparison on both the field name and the field body which might be a long path
 255              *  name.
 256              */
 257
 258             for (n = 0, cp = field; (c = getc(fp)) != EOF; *cp++ = c) {
 259                 if (c == '\n' && (c = getc(fp)) != ' ' && c != '\t') {
 260                     (void)ungetc(c, fp);
 261                     c = '\n';
 262                     break;
 263                 }
 264
 265                 if (++n >= field_size - 1) {
 266                     if ((field = (char *)realloc((void *)field, field_size *= 2)) == (char *)0)
 267                         adios(NULL, "can't grow field buffer.");
 268
 269                     cp = field + n - 1;
 270                 }
 271             }
 272
 273             /*
 274              *  NUL-terminate the field..
 275              */
 276
 277             *cp = '\0';
 278
 279             /*
 280              *  Check for a match on the field name.  We delete the line by not copying it to the
 281              *  temporary file if
 282              *
 283              *   o  The delete flag is 0, meaning that we're going to delete the first matching
 284              *      field, and the text is NULL meaning that we don't care about the field body.
 285              *
 286              *   o  The delete flag is 0, meaning that we're going to delete the first matching
 287              *      field, and the text begins with a / meaning that we're looking for a full
 288              *      path name, and the text matches the field body.
 289              *
 290              *   o  The delete flag is 0, meaning that we're going to delete the first matching
 291              *      field, the text does not begin with a / meaning that we're looking for the
 292              *      last path name component, and the last path name component matches the text.
 293              *
 294              *   o  The delete flag is positive meaning that we're going to delete the nth field
 295              *      with a matching field name, and this is the nth matching field name.
 296              *
 297              *   o  The delete flag is -1 meaning that we're going to delete all fields with a
 298              *      matching field name.
 299              */
 300
 301             if (strncasecmp(field, comp, length) == 0 && field[length] == ':') {
 302                 if (delete == 0) {
 303                     if (text == (char *)0)
 304                         break;
 305
 306                     for (cp = field + length + 1; *cp == ' ' || *cp == '\t'; cp++)
 307                         ;
 308
 309                     if (*text == '/') {
 310                         if (strcmp(cp, text) == 0)
 311                                 break;
 312                     }
 313                     else {
 314                         if ((sp = strrchr(cp, '/')) != (char *)0)
 315                             cp = sp + 1;
 316
 317                         if (strcmp(cp, text) == 0)
 318                             break;
 319                     }
 320                 }
 321
 322                 else if (delete == -1)
 323                         continue;
 324
 325                 else if (++count == delete)
 326                     break;
 327             }
 328
 329             /*
 330              *  This line wasn't a match so copy it to the temporary file.
 331              */
 332
 333             if ((n = fputs(field, tmp)) == EOF || (c == '\n' && fputc('\n', tmp) == EOF))
 334                 adios(NULL, "unable to write temporary file.");
 335
 336         } while (*field != '\0' && *field != '-');
 337
 338         /*
 339          *  Get rid of the field buffer because we're done with it.
 340          */
 341
 342         free((void *)field);
 343     }
 344
 345     else {
 346         /*
 347          *  Find the end of the headers before adding the annotations if we're
 348          *  appending instead of the default prepending.  A special check for
 349          *  no headers is needed if appending.
 350          */
 351
 352         if (append) {
 353             /*
 354              *  Copy lines from the input file to the temporary file until we
 355              *  reach the end of the headers.
 356              */
 357
 358             if ((c = getc(fp)) == '\n')
 359                 rewind(fp);
 360
 361             else {
 362                 (void)putc(c, tmp);
 363
 364                 while ((c = getc(fp)) != EOF) {
 365                     (void)putc(c, tmp);
 366
 367                     if (c == '\n') {
 368                         (void)ungetc(c = getc(fp), fp);
 369
 370                         if (c == '\n' || c == '-')
 371                             break;
 372                     }
 373                 }
 374             }
 375         }
 376
 377         if (datesw)
 378             fprintf (tmp, "%s: %s\n", comp, dtimenow (0));
 379         if ((cp = text)) {
 380             do {
 381                 while (*cp == ' ' || *cp == '\t')
 382                     cp++;
 383                 sp = cp;
 384                 while (*cp && *cp++ != '\n')
 385                     continue;
 386                 if (cp - sp)
 387                     fprintf (tmp, "%s: %*.*s", comp, cp - sp, cp - sp, sp);
 388             } while (*cp);
 389             if (cp[-1] != '\n' && cp != text)
 390                 putc ('\n', tmp);
 391         }
 392     }
 393
 394     fflush (tmp);
 395
 396     /*
 397      *  We've been messing with the input file position.  Move the input file
 398      *  descriptor to the current place in the file because the stock data
 399      *  copying routine uses the descriptor, not the pointer.
 400      */
 401
 402     if (append || delete >= -1) {
 403         if (lseek(fd, (off_t)ftell(fp), SEEK_SET) == (off_t)-1)
 404             adios(NULL, "can't seek.");
 405     }
 406
 407     cpydata (fd, fileno (tmp), file, tmpfil);
 408     fclose (tmp);
 409
 410     if (inplace) {
 411         if ((tmpfd = open (tmpfil, O_RDONLY)) == NOTOK)
 412             adios (tmpfil, "unable to open for re-reading");
 413
 414         lseek (fd, (off_t) 0, SEEK_SET);
 415
 416         /*
 417          *  We're making the file shorter if we're deleting a header field
 418          *  so the file has to be truncated or it will contain garbage.
 419          */
 420
 421         if (delete >= -1 && ftruncate(fd, 0) == -1)
 422             adios(tmpfil, "unable to truncate.");
 423
 424         cpydata (tmpfd, fd, tmpfil, file);
 425         close (tmpfd);
 426         unlink (tmpfil);
 427     } else {
 428         strncpy (buffer, m_backup (file), sizeof(buffer));
 429         if (rename (file, buffer) == NOTOK) {
 430             switch (errno) {
 431                 case ENOENT:    /* unlinked early - no annotations */
 432                     unlink (tmpfil);
 433                     break;
 434
 435                 default:
 436                     admonish (buffer, "unable to rename %s to", file);
 437                     break;
 438             }
 439             return 1;
 440         }
 441         if (rename (tmpfil, file) == NOTOK) {
 442             admonish (file, "unable to rename %s to", tmpfil);
 443             return 1;
 444         }
 445     }
 446
 447     /*
 448      *  Close the delete file so that we don't run out of file pointers if
 449      *  we're doing piles of files.  Note that this will make the close() in
 450      *  lkclose() fail, but that failure is ignored so it's not a problem.
 451      */
 452
 453     if (delete >= -1)
 454         (void)fclose(fp);
 455
 456     return 0;
 457 }