From da2bcd5b6a651ad6aa81a94d51b8e3cc61652569 Mon Sep 17 00:00:00 2001 From: Ian Moffett Date: Wed, 9 Jul 2025 01:03:08 -0400 Subject: usr: libc: Introduce POSIX fseek() Signed-off-by: Ian Moffett --- lib/libc/include/stdio.h | 2 ++ lib/libc/src/stdio/fseek.c | 42 ++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 44 insertions(+) create mode 100644 lib/libc/src/stdio/fseek.c diff --git a/lib/libc/include/stdio.h b/lib/libc/include/stdio.h index d721e4e..37931ce 100644 --- a/lib/libc/include/stdio.h +++ b/lib/libc/include/stdio.h @@ -34,6 +34,7 @@ #define __need_NULL #define __need_size_t #include +#include #define __need_va_list #include @@ -79,6 +80,7 @@ long ftell(FILE *stream); char *fgets(char *__restrict s, int size, FILE *__restrict stream); FILE *fopen(const char *__restrict path, const char *__restrict mode); +int fseek(FILE *stream, long offset, int whence); int fclose(FILE *stream); int vsnprintf(char *s, size_t size, const char *fmt, va_list ap); diff --git a/lib/libc/src/stdio/fseek.c b/lib/libc/src/stdio/fseek.c new file mode 100644 index 0000000..b783081 --- /dev/null +++ b/lib/libc/src/stdio/fseek.c @@ -0,0 +1,42 @@ +/* + * Copyright (c) 2023-2025 Ian Marco Moffett and the Osmora Team. + * 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. + * 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. Neither the name of Hyra nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT OWNER OR CONTRIBUTORS 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 +#include +#include + +int +fseek(FILE *stream, long offset, int whence) +{ + if (stream == NULL) { + return -EINVAL; + } + + return lseek(stream->fd, offset, whence); +} -- cgit v1.2.3