stdio.c

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/*
 * Copyright (C) 2004, 2007, 2011-2014  Internet Systems Consortium, Inc. ("ISC")
 * Copyright (C) 2000, 2001  Internet Software Consortium.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */

/* $Id$ */

#include <config.h>

#include <errno.h>
#include <unistd.h>

#include <isc/stdio.h>
#include <isc/stat.h>
#include <isc/util.h>

#include "errno2result.h"

isc_result_t
isc_stdio_open(const char *filename, const char *mode, FILE **fp) {
        FILE *f;

        f = fopen(filename, mode);
        if (f == NULL)
                return (isc__errno2result(errno));
        *fp = f;
        return (ISC_R_SUCCESS);
}

isc_result_t
isc_stdio_close(FILE *f) {
        int r;

        r = fclose(f);
        if (r == 0)
                return (ISC_R_SUCCESS);
        else
                return (isc__errno2result(errno));
}

isc_result_t
isc_stdio_seek(FILE *f, off_t offset, int whence) {
        int r;

#ifdef HAVE_FSEEKO
        r = fseeko(f, offset, whence);
#else
        r = fseek(f, offset, whence);
#endif
        if (r == 0)
                return (ISC_R_SUCCESS);
        else
                return (isc__errno2result(errno));
}

isc_result_t
isc_stdio_tell(FILE *f, off_t *offsetp) {
        off_t r;

        REQUIRE(offsetp != NULL);

#ifdef HAVE_FTELLO
        r = ftello(f);
#else
        r = ftell(f);
#endif
        if (r >= 0) {
                *offsetp = r;
                return (ISC_R_SUCCESS);
        } else
                return (isc__errno2result(errno));
}

isc_result_t
isc_stdio_read(void *ptr, size_t size, size_t nmemb, FILE *f, size_t *nret) {
        isc_result_t result = ISC_R_SUCCESS;
        size_t r;

        clearerr(f);
        r = fread(ptr, size, nmemb, f);
        if (r != nmemb) {
                if (feof(f))
                        result = ISC_R_EOF;
                else
                        result = isc__errno2result(errno);
        }
        if (nret != NULL)
                *nret = r;
        return (result);
}

isc_result_t
isc_stdio_write(const void *ptr, size_t size, size_t nmemb, FILE *f,
               size_t *nret)
{
        isc_result_t result = ISC_R_SUCCESS;
        size_t r;

        clearerr(f);
        r = fwrite(ptr, size, nmemb, f);
        if (r != nmemb)
                result = isc__errno2result(errno);
        if (nret != NULL)
                *nret = r;
        return (result);
}

isc_result_t
isc_stdio_flush(FILE *f) {
        int r;

        r = fflush(f);
        if (r == 0)
                return (ISC_R_SUCCESS);
        else
                return (isc__errno2result(errno));
}

/*
 * OpenBSD has deprecated ENOTSUP in favor of EOPNOTSUPP.
 */
#if defined(EOPNOTSUPP) && !defined(ENOTSUP)
#define ENOTSUP EOPNOTSUPP
#endif

isc_result_t
isc_stdio_sync(FILE *f) {
        int r;

        r = fsync(fileno(f));
        /*
         * fsync is not supported on sockets and pipes which
         * result in EINVAL / ENOTSUP.
         */
        if (r == 0 || errno == EINVAL || errno == ENOTSUP)
                return (ISC_R_SUCCESS);
        else
                return (isc__errno2result(errno));
}

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