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Provide default vprintf on UWP (#2725)

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UWP apps do not have a console attached so any output to stdout/stderr
is lost. Therefore, provide a default BH_VPRINTF in that case for debug
builds which redirects output to the debugger.
This commit is contained in:
zoraaver 2023-11-07 12:37:43 +00:00 committed by GitHub
parent 77b6bce679
commit 3c9cd40aa6
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3 changed files with 50 additions and 8 deletions
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12
core/iwasm/libraries/libc-wasi/sandboxed-system-primitives/src/posix.c
View File

@ -1108,19 +1108,17 @@ wasmtime_ssp_fd_write(wasm_exec_env_t exec_env, struct fd_table *curfds,
error = blocking_op_writev(exec_env, fo->file_handle, iov, (int)iovcnt,
nwritten);
#else
ssize_t len = 0;
/* redirect stdout/stderr output to BH_VPRINTF function */
if (fo->is_stdio) {
int i;
const struct iovec *iov1 = (const struct iovec *)iov;
for (i = 0; i < (int)iovcnt; i++, iov1++) {
if (iov1->iov_len > 0 && iov1->iov_base) {
*nwritten = 0;
for (i = 0; i < (int)iovcnt; i++) {
if (iov[i].buf_len > 0 && iov[i].buf != NULL) {
char format[16];
/* make up format string "%.ns" */
snprintf(format, sizeof(format), "%%.%ds", (int)iov1->iov_len);
len += (ssize_t)os_printf(format, iov1->iov_base);
snprintf(format, sizeof(format), "%%.%ds", (int)iov[i].buf_len);
*nwritten += (size_t)os_printf(format, iov[i].buf);
}
}
}

11
core/shared/platform/windows/platform_internal.h
View File

@ -179,6 +179,17 @@ typedef uint32_t os_raw_file_handle;
#define bh_socket_t windows_handle *
// UWP apps do not have stdout/stderr handles so provide a default
// implementation of vprintf on debug builds so output from WASI libc is sent to
// the debugger and not lost completely.
#if !defined(BH_VPRINTF) && !defined(NDEBUG) && WINAPI_PARTITION_DESKTOP == 0
int
uwp_print_to_debugger(const char *format, va_list ap);
#define BH_VPRINTF uwp_print_to_debugger
#define UWP_DEFAULT_VPRINTF
#endif
#ifdef __cplusplus
}
#endif

33
core/shared/platform/windows/win_util.c
View File

@ -58,3 +58,36 @@ convert_windows_error_code(DWORD windows_error_code)
return __WASI_EINVAL;
}
}
#ifdef UWP_DEFAULT_VPRINTF
int
uwp_print_to_debugger(const char *format, va_list ap)
{
// Provide a stack buffer which should be large enough for any realistic
// string so we avoid making an allocation on every printf call.
char stack_buf[2048];
char *buf = stack_buf;
int ret = vsnprintf(stack_buf, sizeof(stack_buf), format, ap);
if (ret >= sizeof(stack_buf)) {
// Allocate an extra byte for the null terminator.
char *heap_buf = BH_MALLOC(ret + 1);
buf = heap_buf;
if (heap_buf == NULL) {
errno = ENOMEM;
return -1;
}
ret = vsnprintf(heap_buf, ret + 1, format, ap);
}
if (ret >= 0)
OutputDebugStringA(buf);
if (buf != stack_buf)
BH_FREE(buf);
return ret;
}
#endif