isc/unix/stdio.c

	stdio.c revision 32babe43eb479d2ae8736f9985a84d1b9d95a33a
/*
 * Copyright (C) 2004, 2007  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: stdio.c,v 1.9 2011/03/04 14:07:03 smann Exp $ */

#include <config.h>

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

#include <isc/stdio.h>
#include <isc/stat.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, long offset, int whence) {
    int r;

    r = fseek(f, offset, whence);
    if (r == 0)
        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));
}

isc_result_t
isc_stdio_sync(FILE *f) {
    int r;

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