code.delx.au - gnu-emacs/blob - lib-src/b2m.c

   1 /*
   2  * b2m - a filter for Babyl -> Unix mail files
   3  *
   4  * usage:       b2m < babyl > mailbox
   5  *
   6  * I find this useful whenever I have to use a
   7  * system which - shock horror! - doesn't run
   8  * Gnu emacs. At least now I can read all my
   9  * Gnumacs Babyl format mail files!
  10  *
  11  * it's not much but it's free!
  12  *
  13  *   Ed Wilkinson
  14  *   E.Wilkinson@massey.ac.nz
  15  *   Mon Nov 7 15:54:06 PDT 1988
  16  */
  17
  18 /* Made conformant to the GNU coding standards January, 1995
  19    by Francesco Potorti` <pot@cnuce.cnr.it>. */
  20
  21 #include <stdio.h>
  22 #include <time.h>
  23 #include <sys/types.h>
  24 #include <getopt.h>
  25 #ifdef MSDOS
  26 #include <fcntl.h>
  27 #endif
  28
  29 #ifdef HAVE_CONFIG_H
  30 #include <config.h>
  31 /* On some systems, Emacs defines static as nothing for the sake
  32    of unexec.  We don't want that here since we don't use unexec. */
  33 #undef static
  34 #endif
  35
  36 #undef TRUE
  37 #define TRUE    1
  38 #undef FALSE
  39 #define FALSE   0
  40
  41 /* Exit codes for success and failure.  */
  42 #ifdef VMS
  43 #define GOOD    1
  44 #define BAD     0
  45 #else
  46 #define GOOD    0
  47 #define BAD     1
  48 #endif
  49
  50 #define streq(s,t)      (strcmp (s, t) == 0)
  51 #define strneq(s,t,n)   (strncmp (s, t, n) == 0)
  52
  53 typedef int logical;
  54
  55 /*
  56  * A `struct linebuffer' is a structure which holds a line of text.
  57  * `readline' reads a line from a stream into a linebuffer and works
  58  * regardless of the length of the line.
  59  */
  60 struct linebuffer
  61 {
  62   long size;
  63   char *buffer;
  64 };
  65
  66 extern char *strtok();
  67
  68 long *xmalloc (), *xrealloc ();
  69 char *concat ();
  70 long readline ();
  71 void fatal ();
  72
  73 /*
  74  * xnew -- allocate storage.  SYNOPSIS: Type *xnew (int n, Type);
  75  */
  76 #define xnew(n, Type)   ((Type *) xmalloc ((n) * sizeof (Type)))
  77
  78
  79
  80 char *progname;
  81
  82 struct option longopts[] =
  83 {
  84   { "help",                     no_argument,       NULL,     'h'   },
  85   { "version",                  no_argument,       NULL,     'V'   },
  86   { 0 }
  87 };
  88
  89 extern int optind;
  90
  91 main (argc, argv)
  92      int argc;
  93      char **argv;
  94 {
  95   logical labels_saved, printing, header;
  96   time_t ltoday;
  97   char *labels, *p, *today;
  98   struct linebuffer data;
  99
 100 #ifdef MSDOS
 101   _fmode = O_BINARY;            /* all of files are treated as binary files */
 102 #if __DJGPP__ > 1
 103   if (!isatty (fileno (stdout)))
 104     setmode (fileno (stdout), O_BINARY);
 105   if (!isatty (fileno (stdin)))
 106     setmode (fileno (stdin), O_BINARY);
 107 #else /* not __DJGPP__ > 1 */
 108   (stdout)->_flag &= ~_IOTEXT;
 109   (stdin)->_flag &= ~_IOTEXT;
 110 #endif /* not __DJGPP__ > 1 */
 111 #endif
 112   progname = argv[0];
 113
 114   while (1)
 115     {
 116       int opt = getopt_long (argc, argv, "hV", longopts, 0);
 117       if (opt == EOF)
 118         break;
 119
 120       switch (opt)
 121         {
 122         case 'V':
 123           printf ("%s (GNU Emacs %s)\n", "b2m", VERSION);
 124           puts ("b2m is in the public domain.");
 125           exit (GOOD);
 126
 127         case 'h':
 128           fprintf (stderr, "Usage: %s <babylmailbox >unixmailbox\n", progname);
 129           exit (GOOD);
 130         }
 131     }
 132
 133   if (optind != argc)
 134     {
 135       fprintf (stderr, "Usage: %s <babylmailbox >unixmailbox\n", progname);
 136       exit (GOOD);
 137     }
 138
 139   labels_saved = printing = header = FALSE;
 140   ltoday = time (0);
 141   today = ctime (&ltoday);
 142   data.size = 200;
 143   data.buffer = xnew (200, char);
 144
 145   if (readline (&data, stdin) == 0
 146       || !strneq (data.buffer, "BABYL OPTIONS:", 14))
 147     fatal ("standard input is not a Babyl mailfile.");
 148
 149   while (readline (&data, stdin) > 0)
 150     {
 151       if (streq (data.buffer, "*** EOOH ***") && !printing)
 152         {
 153           printing = header = TRUE;
 154           printf ("From \"Babyl to mail by %s\" %s", progname, today);
 155           continue;
 156         }
 157
 158       if (data.buffer[0] == '\037')
 159         {
 160           if (data.buffer[1] == '\0')
 161             continue;
 162           else if (data.buffer[1] == '\f')
 163             {
 164               /* Save labels. */
 165               readline (&data, stdin);
 166               p = strtok (data.buffer, " ,\r\n\t");
 167               labels = "X-Babyl-Labels: ";
 168
 169               while (p = strtok (NULL, " ,\r\n\t"))
 170                 labels = concat (labels, p, ", ");
 171
 172               p = &labels[strlen (labels) - 2];
 173               if (*p == ',')
 174                 *p = '\0';
 175               printing = header = FALSE;
 176               labels_saved = TRUE;
 177               continue;
 178             }
 179         }
 180
 181       if ((data.buffer[0] == '\0') && header)
 182         {
 183           header = FALSE;
 184           if (labels_saved)
 185             puts (labels);
 186         }
 187
 188       if (printing)
 189         puts (data.buffer);
 190     }
 191 }
 192
 193
 194
 195 /*
 196  * Return a newly-allocated string whose contents
 197  * concatenate those of s1, s2, s3.
 198  */
 199 char *
 200 concat (s1, s2, s3)
 201      char *s1, *s2, *s3;
 202 {
 203   int len1 = strlen (s1), len2 = strlen (s2), len3 = strlen (s3);
 204   char *result = xnew (len1 + len2 + len3 + 1, char);
 205
 206   strcpy (result, s1);
 207   strcpy (result + len1, s2);
 208   strcpy (result + len1 + len2, s3);
 209   result[len1 + len2 + len3] = '\0';
 210
 211   return result;
 212 }
 213
 214 /*
 215  * Read a line of text from `stream' into `linebuffer'.
 216  * Return the number of characters read from `stream',
 217  * which is the length of the line including the newline, if any.
 218  */
 219 long
 220 readline (linebuffer, stream)
 221      struct linebuffer *linebuffer;
 222      register FILE *stream;
 223 {
 224   char *buffer = linebuffer->buffer;
 225   register char *p = linebuffer->buffer;
 226   register char *pend;
 227   int chars_deleted;
 228
 229   pend = p + linebuffer->size;  /* Separate to avoid 386/IX compiler bug.  */
 230
 231   while (1)
 232     {
 233       register int c = getc (stream);
 234       if (p == pend)
 235         {
 236           linebuffer->size *= 2;
 237           buffer = (char *) xrealloc (buffer, linebuffer->size);
 238           p += buffer - linebuffer->buffer;
 239           pend = buffer + linebuffer->size;
 240           linebuffer->buffer = buffer;
 241         }
 242       if (c == EOF)
 243         {
 244           *p = '\0';
 245           chars_deleted = 0;
 246           break;
 247         }
 248       if (c == '\n')
 249         {
 250           if (p > buffer && p[-1] == '\r')
 251             {
 252               *--p = '\0';
 253               chars_deleted = 2;
 254             }
 255           else
 256             {
 257               *p = '\0';
 258               chars_deleted = 1;
 259             }
 260           break;
 261         }
 262       *p++ = c;
 263     }
 264
 265   return (p - buffer + chars_deleted);
 266 }
 267
 268 /*
 269  * Like malloc but get fatal error if memory is exhausted.
 270  */
 271 long *
 272 xmalloc (size)
 273      unsigned int size;
 274 {
 275   long *result = (long *) malloc (size);
 276   if (result == NULL)
 277     fatal ("virtual memory exhausted");
 278   return result;
 279 }
 280
 281 long *
 282 xrealloc (ptr, size)
 283      char *ptr;
 284      unsigned int size;
 285 {
 286   long *result = (long *) realloc (ptr, size);
 287   if (result == NULL)
 288     fatal ("virtual memory exhausted");
 289   return result;
 290 }
 291
 292 void
 293 fatal (message)
 294 {
 295   fprintf (stderr, "%s: %s\n", progname, message);
 296   exit (BAD);
 297 }
 298