linux-kernel - [PATCH v2 2/3] tools/nolibc: Add fseek() to stdio.h

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Message-ID: <20260105023629.1502801-3-daniel@thingy.jp>
Date: Mon,  5 Jan 2026 11:36:28 +0900
From: Daniel Palmer <daniel@...ngy.jp>
To: w@....eu,
	linux@...ssschuh.net
Cc: david.laight.linux@...il.com,
	linux-kernel@...r.kernel.org,
	Daniel Palmer <daniel@...ngy.jp>
Subject: [PATCH v2 2/3] tools/nolibc: Add fseek() to stdio.h

A very basic wrapper around lseek() that implements fseek().

Signed-off-by: Daniel Palmer <daniel@...ngy.jp>
---
 tools/include/nolibc/stdio.h | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/tools/include/nolibc/stdio.h b/tools/include/nolibc/stdio.h
index 6904252df97d..233318b0d0f0 100644
--- a/tools/include/nolibc/stdio.h
+++ b/tools/include/nolibc/stdio.h
@@ -272,6 +272,25 @@ char *fgets(char *s, int size, FILE *stream)
 }
 
 
+/* fseek */
+static __attribute__((unused))
+int fseek(FILE *stream, long offset, int whence)
+{
+	int fd = fileno(stream);
+	off_t ret;
+
+	ret = lseek(fd, offset, whence);
+
+	/* lseek() and fseek() differ in that lseek returns the new
+	 * position or -1, fseek() returns either 0 or -1.
+	 */
+	if (ret >= 0)
+		return 0;
+
+	return -1;
+}
+
+
 /* minimal printf(). It supports the following formats:
  *  - %[l*]{d,u,c,x,p}
  *  - %s
-- 
2.51.0