| 0,0 → 1,219 |
|---|
| /* |
| * Copyright (c) 2008 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 |
| * @brief ANSI C Stream I/O. |
| */ |
| |
| #include <stdlib.h> |
| #include <sys/types.h> |
| #include <sys/stat.h> |
| #include <fcntl.h> |
| #include <unistd.h> |
| #include <errno.h> |
| #include <bool.h> |
| #include <stdio.h> |
| |
| /** |
| * Open a stream. |
| * |
| * @param file_name Name of the file to open. |
| * @param mode Mode string, (r|w|a)[b|t][+]. |
| */ |
| FILE *fopen(const char *file_name, const char *mode) |
| { |
| FILE *f; |
| int flags; |
| bool plus; |
| const char *mp; |
| |
| /* Parse mode except first character. */ |
| |
| mp = mode; |
| if (*mp++ == '\0') { |
| errno = EINVAL; |
| return NULL; |
| } |
| |
| if (*mp == 'b' || *mp == 't') ++mp; |
| |
| if (*mp == '+') { |
| ++mp; |
| plus = true; |
| } else { |
| plus = false; |
| } |
| |
| if (*mp != '\0') { |
| errno = EINVAL; |
| return NULL; |
| } |
| |
| /* Parse first character of mode and determine flags for open(). */ |
| |
| switch (mode[0]) { |
| case 'r': |
| flags = plus ? O_RDWR : O_RDONLY; |
| break; |
| case 'w': |
| flags = (O_TRUNC | O_CREAT) | (plus ? O_RDWR : O_WRONLY); |
| break; |
| case 'a': |
| /* TODO: a+ must read from beginning, append to the end. */ |
| if (plus) { |
| errno = ENOTSUP; |
| return NULL; |
| } |
| flags = (O_APPEND | O_CREAT) | (plus ? O_RDWR : O_WRONLY); |
| default: |
| errno = EINVAL; |
| return NULL; |
| } |
| |
| /* Open file. */ |
| |
| f = malloc(sizeof(FILE)); |
| if (f == NULL) { |
| errno = ENOMEM; |
| return NULL; |
| } |
| |
| f->fd = open(file_name, flags, 0666); |
| if (f->fd < 0) { |
| free(f); |
| return NULL; /* errno was set by open() */ |
| } |
| |
| f->error = 0; |
| f->eof = 0; |
| |
| return f; |
| } |
| |
| /** Close a stream. |
| * |
| * @param f Pointer to stream. |
| * @return 0 on success, EOF on error. |
| */ |
| int fclose(FILE *f) |
| { |
| int rc; |
| |
| rc = close(f->fd); |
| free(f); |
| |
| if (rc != 0) |
| return EOF; /* errno was set by close() */ |
| |
| return 0; |
| } |
| |
| /** Read from a stream. |
| * |
| * @param buf Destination buffer. |
| * @param size Size of each record. |
| * @param nmemb Number of records to read. |
| * @param f Pointer to the stream. |
| */ |
| size_t fread(void *buf, size_t size, size_t nmemb, FILE *f) |
| { |
| size_t left, done, n; |
| |
| left = size * nmemb; |
| done = 0; |
| |
| while (left > 0 && !f->error && !f->eof) { |
| n = read(f->fd, buf + done, left); |
| |
| if (n < 0) { |
| f->error = 1; |
| } else if (n == 0) { |
| f->eof = 1; |
| } else { |
| left -= n; |
| done += n; |
| } |
| } |
| |
| return done / size; |
| } |
| |
| |
| /** Write to a stream. |
| * |
| * @param buf Source buffer. |
| * @param size Size of each record. |
| * @param nmemb Number of records to write. |
| * @param f Pointer to the stream. |
| */ |
| size_t fwrite(const void *buf, size_t size, size_t nmemb, FILE *f) |
| { |
| size_t left, done, n; |
| |
| left = size * nmemb; |
| done = 0; |
| |
| while (left > 0 && !f->error) { |
| n = write(f->fd, buf + done, left); |
| |
| if (n <= 0) { |
| f->error = 1; |
| } else { |
| left -= n; |
| done += n; |
| } |
| } |
| |
| return done / size; |
| } |
| |
| /** Return the end-of-file indicator of a stream. */ |
| int feof(FILE *f) |
| { |
| return f->eof; |
| } |
| |
| /** Return the error indicator of a stream. */ |
| int ferror(FILE *f) |
| { |
| return f->error; |
| } |
| |
| /** Clear the error and end-of-file indicators of a stream. */ |
| void clearerr(FILE *f) |
| { |
| f->eof = 0; |
| f->error = 0; |
| } |
| |
| /** @} |
| */ |