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[122.26.212.247]) by smtp.googlemail.com with ESMTPSA id d9443c01a7336-2a2f3d4cbdasm438563655ad.65.2026.01.04.18.36.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 04 Jan 2026 18:36:52 -0800 (PST) From: Daniel Palmer To: w@1wt.eu, linux@weissschuh.net Cc: david.laight.linux@gmail.com, linux-kernel@vger.kernel.org, Daniel Palmer Subject: [PATCH v2 1/3] tools/nolibc: Add fread() to stdio.h Date: Mon, 5 Jan 2026 11:36:27 +0900 Message-ID: <20260105023629.1502801-2-daniel@thingy.jp> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260105023629.1502801-1-daniel@thingy.jp> References: <20260105023629.1502801-1-daniel@thingy.jp> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add a very basic version of fread() like we already have for fwrite(). Signed-off-by: Daniel Palmer --- tools/include/nolibc/stdio.h | 34 +++++++++++++++++++++++++++++++++- 1 file changed, 33 insertions(+), 1 deletion(-) diff --git a/tools/include/nolibc/stdio.h b/tools/include/nolibc/stdio.h index 1f16dab2ac88..6904252df97d 100644 --- a/tools/include/nolibc/stdio.h +++ b/tools/include/nolibc/stdio.h @@ -170,7 +170,7 @@ int putchar(int c) } =20 =20 -/* fwrite(), puts(), fputs(). Note that puts() emits '\n' but not fputs().= */ +/* fwrite(), fread(), puts(), fputs(). Note that puts() emits '\n' but not= fputs(). */ =20 /* 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 +204,38 @@ size_t fwrite(const void *s, size_t size, size_t nmemb= , FILE *stream) return written; } =20 +/* 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) +{ + int fd =3D fileno(stream); + ssize_t ret; + + while (size) { + ret =3D read(fd, buf, size); + if (ret <=3D 0) + return EOF; + size -=3D ret; + buf +=3D ret; + } + return 0; +} + +static __attribute__((unused)) +size_t fread(void *s, size_t size, size_t nmemb, FILE *stream) +{ + size_t nread; + + for (nread =3D 0; nread < nmemb; nread++) { + if (_fread(s, size, stream) !=3D 0) + break; + s +=3D size; + } + return nread; +} + static __attribute__((unused)) int fputs(const char *s, FILE *stream) { --=20 2.51.0