From 20643843847c12c2a3689ee7be28f351132a20e0 Mon Sep 17 00:00:00 2001 From: Sascha Hauer Date: Wed, 23 Jun 2021 06:33:58 +0200 Subject: libfile: Add copy_fd() Signed-off-by: Sascha Hauer Link: https://lore.barebox.org/20210623043359.18391-3-s.hauer@pengutronix.de Signed-off-by: Sascha Hauer --- include/libfile.h | 1 + lib/libfile.c | 23 +++++++++++++++++++++++ 2 files changed, 24 insertions(+) diff --git a/include/libfile.h b/include/libfile.h index 350ddddf70..3c2fe1714d 100644 --- a/include/libfile.h +++ b/include/libfile.h @@ -5,6 +5,7 @@ int pwrite_full(int fd, const void *buf, size_t size, loff_t offset); int write_full(int fd, const void *buf, size_t size); int read_full(int fd, void *buf, size_t size); +int copy_fd(int in, int out); char *read_file_line(const char *fmt, ...); diff --git a/lib/libfile.c b/lib/libfile.c index 4ab8db11ad..40b1d8bb27 100644 --- a/lib/libfile.c +++ b/lib/libfile.c @@ -100,6 +100,29 @@ int read_full(int fd, void *buf, size_t size) } EXPORT_SYMBOL(read_full); +int copy_fd(int in, int out) +{ + int bs = 4096, ret; + void *buf = malloc(bs); + + if (!buf) + return -ENOMEM; + + while (1) { + ret = read(in, buf, bs); + if (ret <= 0) + break; + + ret = write_full(out, buf, ret); + if (ret < 0) + break; + } + + free(buf); + + return ret; +} + /* * read_file_line - read a line from a file * -- cgit v1.2.3