diff options
Diffstat (limited to 'libc-top-half/musl/src/stdio/__stdio_write.c')
-rw-r--r-- | libc-top-half/musl/src/stdio/__stdio_write.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/libc-top-half/musl/src/stdio/__stdio_write.c b/libc-top-half/musl/src/stdio/__stdio_write.c new file mode 100644 index 0000000..7537304 --- /dev/null +++ b/libc-top-half/musl/src/stdio/__stdio_write.c @@ -0,0 +1,38 @@ +#include "stdio_impl.h" +#include <sys/uio.h> + +size_t __stdio_write(FILE *f, const unsigned char *buf, size_t len) +{ + struct iovec iovs[2] = { + { .iov_base = f->wbase, .iov_len = f->wpos-f->wbase }, + { .iov_base = (void *)buf, .iov_len = len } + }; + struct iovec *iov = iovs; + size_t rem = iov[0].iov_len + iov[1].iov_len; + int iovcnt = 2; + ssize_t cnt; + for (;;) { +#ifdef __wasilibc_unmodified_upstream // WASI has no syscall + cnt = syscall(SYS_writev, f->fd, iov, iovcnt); +#else + cnt = writev(f->fd, iov, iovcnt); +#endif + if (cnt == rem) { + f->wend = f->buf + f->buf_size; + f->wpos = f->wbase = f->buf; + return len; + } + if (cnt < 0) { + f->wpos = f->wbase = f->wend = 0; + f->flags |= F_ERR; + return iovcnt == 2 ? 0 : len-iov[0].iov_len; + } + rem -= cnt; + if (cnt > iov[0].iov_len) { + cnt -= iov[0].iov_len; + iov++; iovcnt--; + } + iov[0].iov_base = (char *)iov[0].iov_base + cnt; + iov[0].iov_len -= cnt; + } +} |