sbin/savecore/zopen.c

   1 /*      $NetBSD: zopen.c,v 1.1 2001/01/02 21:39:37 joda Exp $   */
   2
   3 /*
   4  * Public domain stdio wrapper for libz, written by Johan Danielsson.
   5  */
   6
   7 #include <sys/cdefs.h>
   8 #ifndef lint
   9 __RCSID("$NetBSD: zopen.c,v 1.1 2001/01/02 21:39:37 joda Exp $");
  10 #endif
  11
  12 #include <stdio.h>
  13 #include <zlib.h>
  14
  15 FILE *zopen(const char *fname, const char *mode);
  16
  17 /* convert arguments */
  18 static int
  19 xgzread(void *cookie, char *data, int size)
  20 {
  21     return gzread(cookie, data, size);
  22 }
  23
  24 static int
  25 xgzwrite(void *cookie, const char *data, int size)
  26 {
  27     return gzwrite(cookie, __UNCONST(data), size);
  28 }
  29
  30 FILE *
  31 zopen(const char *fname, const char *mode)
  32 {
  33     gzFile gz = gzopen(fname, mode);
  34     if(gz == NULL)
  35         return NULL;
  36
  37     if(*mode == 'r')
  38         return (funopen(gz, xgzread, NULL, NULL, gzclose));
  39     else
  40         return (funopen(gz, NULL, xgzwrite, NULL, gzclose));
  41 }