lib/libfetch/file.c


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/*-
 * Copyright (c) 1998-2004 Dag-Erling Coïdan Smørgrav
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer
 *    in this position and unchanged.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/cdefs.h>

#include <sys/param.h>
#include <sys/stat.h>

#include <dirent.h>
#include <stdio.h>
#include <string.h>

#include "fetch.h"
#include "common.h"

FILE *
fetchXGetFile(struct url *u, struct url_stat *us, const char *flags)
{
        FILE *f;

        if (us && fetchStatFile(u, us, flags) == -1)
                return (NULL);

        f = fopen(u->doc, "r");

        if (f == NULL)
                _fetch_syserr();

        if (u->offset && fseeko(f, u->offset, SEEK_SET) == -1) {
                fclose(f);
                _fetch_syserr();
        }

        return (f);
}

FILE *
fetchGetFile(struct url *u, const char *flags)
{
        return (fetchXGetFile(u, NULL, flags));
}

FILE *
fetchPutFile(struct url *u, const char *flags)
{
        FILE *f;

        if (CHECK_FLAG('a'))
                f = fopen(u->doc, "a");
        else
                f = fopen(u->doc, "w+");

        if (f == NULL)
                _fetch_syserr();

        if (u->offset && fseeko(f, u->offset, SEEK_SET) == -1) {
                fclose(f);
                _fetch_syserr();
        }

        return (f);
}

static int
_fetch_stat_file(const char *fn, struct url_stat *us)
{
        struct stat sb;

        us->size = -1;
        us->atime = us->mtime = 0;
        if (stat(fn, &sb) == -1) {
                _fetch_syserr();
                return (-1);
        }
        us->size = sb.st_size;
        us->atime = sb.st_atime;
        us->mtime = sb.st_mtime;
        return (0);
}

int
fetchStatFile(struct url *u, struct url_stat *us, const char *flags)
{
        return (_fetch_stat_file(u->doc, us));
}

struct url_ent *
fetchListFile(struct url *u, const char *flags)
{
        struct dirent *de;
        struct url_stat us;
        struct url_ent *ue;
        int size, len;
        char fn[PATH_MAX], *p;
        DIR *dir;
        int l;

        if ((dir = opendir(u->doc)) == NULL) {
                _fetch_syserr();
                return (NULL);
        }

        ue = NULL;
        strncpy(fn, u->doc, sizeof(fn) - 2);
        fn[sizeof(fn) - 2] = 0;
        strcat(fn, "/");
        p = strchr(fn, 0);
        l = sizeof(fn) - strlen(fn) - 1;

        while ((de = readdir(dir)) != NULL) {
                strncpy(p, de->d_name, l - 1);
                p[l - 1] = 0;
                if (_fetch_stat_file(fn, &us) == -1)
                        /* should I return a partial result, or abort? */
                        break;
                _fetch_add_entry(&ue, &size, &len, de->d_name, &us);
        }

        return (ue);
}