/* * Copyright (c) 2018 Jiri Svoboda * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * - Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * - 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. * - 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. */ /** @addtogroup libc * @{ */ /** @file C standard file manipulation functions */ #include <errno.h> #include <stdbool.h> #include <stdio.h> #include <str.h> #include <str_error.h> #include <tmpfile.h> #include <vfs/vfs.h> /** Static buffer for tmpnam function */ static char tmpnam_buf[L_tmpnam]; /** Get stream position. * * @param stream Stream * @param pos Place to store position * * @return Zero on success, non-zero on failure */ int fgetpos(FILE *stream, fpos_t *pos) { off64_t p; p = ftell64(stream); if (p < 0) return -1; pos->pos = p; return 0; } /** Get stream position. * * @param stream Stream * @param pos Position * * @return Zero on sucess, non-zero on failure */ int fsetpos(FILE *stream, const fpos_t *pos) { int rc; rc = fseek64(stream, pos->pos, SEEK_SET); if (rc < 0) return -1; return 0; } /** Rename file or directory (C standard) */ int rename(const char *old_path, const char *new_path) { errno_t rc; rc = vfs_rename_path(old_path, new_path); if (rc != EOK) { /* * Note that ISO C leaves the value of errno undefined, * whereas according to UN*X standards, it is set. */ errno = rc; return -1; } return 0; } /** Remove file or directory (C standard) */ int remove(const char *path) { errno_t rc; rc = vfs_unlink_path(path); if (rc != EOK) { /* * Note that ISO C leaves the value of errno undefined, * whereas according to UN*X standards, it is set. */ errno = rc; return -1; } return 0; } /** Create a temporary file. * * @return Open stream descriptor or @c NULL on error. In that case * errno is set (UN*X). Note that ISO C leaves the value of errno * undefined. */ FILE *tmpfile(void) { int file; FILE *stream; file = __tmpfile(); if (file < 0) { printf("file is < 0\n"); errno = EEXIST; return NULL; } stream = fdopen(file, "w+"); if (stream == NULL) { printf("stream = NULL\n"); vfs_put(file); errno = EACCES; return NULL; } return stream; } /** Create name for a temporary file. * * @param s Pointer to array of at least L_tmpnam bytes or @c NULL. * @return The pointer @a s or pointer to internal static buffer on success, * @c NULL on error. */ char *tmpnam(char *s) { char *p; p = (s != NULL) ? s : tmpnam_buf; return __tmpnam(p); } /** Print error message and string representation of @c errno. * * @param s Error message */ void perror(const char *s) { if (s != NULL && *s != '\0') fprintf(stderr, "%s: %s\n", s, str_error(errno)); else fprintf(stderr, "%s\n", str_error(errno)); } /** @} */