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Enable to use BH_VPRINTF macro to redirect stdout output (#560)

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Enable to use BH_VPRINTF macro for platform Linux/Windows/Darwin/VxWorks to redirect the stdout output from platform os_printf/os_vprintf, or the wasi output from wasm app to the vprintf like callback function specified by BH_VPRINTF macro of cmake WAMR_BH_VPRINTF variable.

Signed-off-by: Wenyong Huang <wenyong.huang@intel.com>
This commit is contained in:
Wenyong Huang
2021-03-06 08:29:58 -06:00
committed by GitHub
parent a4239f1ffd
commit a1568825e8
10 changed files with 132 additions and 7 deletions
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27
core/iwasm/libraries/libc-uvwasi/libc_uvwasi_wrapper.c
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@ -604,8 +604,31 @@ wasi_fd_write(wasm_exec_env_t exec_env, wasi_fd_t fd,
ciovec->buf_len = iovec_app->buf_len;
}
err = uvwasi_fd_write(uvwasi, fd,
ciovec_begin, iovs_len, &nwritten);
#ifndef BH_VPRINTF
err = uvwasi_fd_write(uvwasi, fd, ciovec_begin, iovs_len, &nwritten);
#else
/* redirect stdout/stderr output to BH_VPRINTF function */
if (fd == 1 || fd == 2) {
int i;
const struct iovec *iov1 = (const struct iovec *)ciovec_begin;
nwritten = 0;
for (i = 0; i < (int)iovs_len; i++, iov1++) {
if (iov1->iov_len > 0 && iov1->iov_base) {
char format[16];
/* make up format string "%.ns" */
snprintf(format, sizeof(format), "%%.%ds", (int)iov1->iov_len);
nwritten += (uvwasi_size_t)os_printf(format, iov1->iov_base);
}
}
err = 0;
}
else {
err = uvwasi_fd_write(uvwasi, fd, ciovec_begin, iovs_len, &nwritten);
}
#endif /* end of BH_VPRINTF */
if (err)
goto fail;