diff options
author | Sascha Hauer <s.hauer@pengutronix.de> | 2021-06-23 06:33:58 +0200 |
---|---|---|
committer | Sascha Hauer <s.hauer@pengutronix.de> | 2021-06-23 08:43:00 +0200 |
commit | 20643843847c12c2a3689ee7be28f351132a20e0 (patch) | |
tree | 7ce3d4bec8f1d1e1fb68eaa529b2953dfbdd8483 | |
parent | 9c80942b4b116d54907a51ef168a9f26254e4460 (diff) | |
download | barebox-20643843847c12c2a3689ee7be28f351132a20e0.tar.gz barebox-20643843847c12c2a3689ee7be28f351132a20e0.tar.xz |
libfile: Add copy_fd()
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Link: https://lore.barebox.org/20210623043359.18391-3-s.hauer@pengutronix.de
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
-rw-r--r-- | include/libfile.h | 1 | ||||
-rw-r--r-- | lib/libfile.c | 23 |
2 files changed, 24 insertions, 0 deletions
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 * |