linux-kernel - [PATCH 1/2] tools/nolibc: Add fread() to stdio.h

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20260104083837.1390041-2-daniel@thingy.jp>
Date: Sun,  4 Jan 2026 17:38:36 +0900
From: Daniel Palmer <daniel@...ngy.jp>
To: w@....eu,
	linux@...ssschuh.net
Cc: linux-kernel@...r.kernel.org,
	Daniel Palmer <daniel@...ngy.jp>
Subject: [PATCH 1/2] tools/nolibc: Add fread() to stdio.h

Add a very basic version of fread() like we already have for fwrite().

Signed-off-by: Daniel Palmer <daniel@...ngy.jp>
---
 tools/include/nolibc/stdio.h | 35 ++++++++++++++++++++++++++++++++++-
 1 file changed, 34 insertions(+), 1 deletion(-)

diff --git a/tools/include/nolibc/stdio.h b/tools/include/nolibc/stdio.h
index 1f16dab2ac88..21569ebae824 100644
--- a/tools/include/nolibc/stdio.h
+++ b/tools/include/nolibc/stdio.h
@@ -170,7 +170,7 @@ int putchar(int c)
 }
 
 
-/* fwrite(), puts(), fputs(). Note that puts() emits '\n' but not fputs(). */
+/* fwrite(), fread(), puts(), fputs(). Note that puts() emits '\n' but not fputs(). */
 
 /* internal fwrite()-like function which only takes a size and returns 0 on
  * success or EOF on error. It automatically retries on short writes.
@@ -204,6 +204,39 @@ size_t fwrite(const void *s, size_t size, size_t nmemb, FILE *stream)
 	return written;
 }
 
+/* internal fread()-like function which only takes a size and returns 0 on
+ * success or EOF on error. It automatically retries on short reads.
+ */
+static __attribute__((unused))
+int _fread(void *buf, size_t size, FILE *stream)
+{
+	ssize_t ret;
+	int fd = fileno(stream);
+
+	while (size) {
+		ret = read(fd, buf, size);
+		if (ret <= 0)
+			return EOF;
+		size -= ret;
+		buf += ret;
+	}
+	return 0;
+}
+
+
+static __attribute__((unused))
+size_t fread(void *s, size_t size, size_t nmemb, FILE *stream)
+{
+	size_t readed;
+
+	for (readed = 0; readed < nmemb; readed++) {
+		if (_fread(s, size, stream) != 0)
+			break;
+		s += size;
+	}
+	return readed;
+}
+
 static __attribute__((unused))
 int fputs(const char *s, FILE *stream)
 {
-- 
2.51.0