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141 lines
2.8 KiB
C
141 lines
2.8 KiB
C
/*
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* udev_utils_file.c - files operations
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*
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* Copyright (C) 2004-2005 Kay Sievers <kay.sievers@vrfy.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <stddef.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <ctype.h>
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#include <dirent.h>
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#include <sys/stat.h>
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#include <sys/mman.h>
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#include "udev_libc_wrapper.h"
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#include "udev.h"
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#include "logging.h"
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#include "udev_utils.h"
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#include "list.h"
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int create_path(const char *path)
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{
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char p[PATH_SIZE];
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char *pos;
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struct stat stats;
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strcpy (p, path);
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pos = strrchr(p, '/');
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if (pos == p || pos == NULL)
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return 0;
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while (pos[-1] == '/')
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pos--;
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pos[0] = '\0';
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dbg("stat '%s'\n", p);
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if (stat (p, &stats) == 0 && (stats.st_mode & S_IFMT) == S_IFDIR)
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return 0;
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if (create_path (p) != 0)
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return -1;
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dbg("mkdir '%s'\n", p);
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return mkdir(p, 0755);
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}
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/* Reset permissions on the device node, before unlinking it to make sure,
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* that permisions of possible hard links will be removed too.
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*/
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int unlink_secure(const char *filename)
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{
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int retval;
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retval = chown(filename, 0, 0);
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if (retval)
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err("chown(%s, 0, 0) failed: %s", filename, strerror(errno));
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retval = chmod(filename, 0000);
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if (retval)
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err("chmod(%s, 0000) failed: %s", filename, strerror(errno));
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retval = unlink(filename);
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if (errno == ENOENT)
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retval = 0;
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if (retval)
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err("unlink(%s) failed: %s", filename, strerror(errno));
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return retval;
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}
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int file_map(const char *filename, char **buf, size_t *bufsize)
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{
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struct stat stats;
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int fd;
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fd = open(filename, O_RDONLY);
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if (fd < 0) {
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return -1;
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}
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if (fstat(fd, &stats) < 0) {
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close(fd);
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return -1;
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}
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*buf = mmap(NULL, stats.st_size, PROT_READ, MAP_SHARED, fd, 0);
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if (*buf == MAP_FAILED) {
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close(fd);
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return -1;
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}
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*bufsize = stats.st_size;
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close(fd);
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return 0;
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}
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void file_unmap(void *buf, size_t bufsize)
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{
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munmap(buf, bufsize);
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}
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/* return number of chars until the next newline, skip escaped newline */
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size_t buf_get_line(const char *buf, size_t buflen, size_t cur)
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{
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int escape = 0;
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size_t count;
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for (count = cur; count < buflen; count++) {
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if (!escape && buf[count] == '\n')
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break;
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if (buf[count] == '\\')
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escape = 1;
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else
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escape = 0;
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}
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return count - cur;
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}
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