NetBSD/sbin/savecore/zopen.c

42 lines
873 B
C

/* $NetBSD: zopen.c,v 1.4 2017/01/10 04:42:20 kamil Exp $ */
/*
* Public domain stdio wrapper for libz, written by Johan Danielsson.
*/
#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: zopen.c,v 1.4 2017/01/10 04:42:20 kamil Exp $");
#endif
#include <stdio.h>
#include <zlib.h>
FILE *zopen(const char *fname, const char *mode);
/* convert arguments */
static int
xgzread(void *cookie, char *data, int size)
{
return gzread(cookie, data, size);
}
static int
xgzwrite(void *cookie, const char *data, int size)
{
return gzwrite(cookie, __UNCONST(data), size);
}
FILE *
zopen(const char *fname, const char *mode)
{
gzFile gz = gzopen(fname, mode);
if(gz == NULL)
return NULL;
if(*mode == 'r')
return funopen(gz, xgzread, NULL, NULL, (int (*)(void *))gzclose);
else
return funopen(gz, NULL, xgzwrite, NULL, (int (*)(void *))gzclose);
}