128 lines
3.7 KiB
C
128 lines
3.7 KiB
C
/*
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* Duktape 1.x compatible print() and alert() bindings.
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*/
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#include <stdio.h>
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#include <string.h>
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#include "duktape.h"
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#include "duk_print_alert.h"
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#define DUK_PRINT_ALERT_FLUSH /* Flush after stdout/stderr write (Duktape 1.x: yes) */
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#undef DUK_PRINT_ALERT_SMALL /* Prefer smaller footprint (but slower and more memory churn) */
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#if defined(DUK_PRINT_ALERT_SMALL)
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static duk_ret_t duk__print_alert_helper(duk_context *ctx, FILE *fh) {
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duk_idx_t nargs;
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nargs = duk_get_top(ctx);
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/* If argument count is 1 and first argument is a buffer, write the buffer
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* as raw data into the file without a newline; this allows exact control
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* over stdout/stderr without an additional entrypoint (useful for now).
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* Otherwise current print/alert semantics are to ToString() coerce
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* arguments, join them with a single space, and append a newline.
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*/
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if (nargs == 1 && duk_is_buffer_data(ctx, 0)) {
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buf = (const duk_uint8_t *) duk_get_buffer_data(ctx, 0, &sz_buf);
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fwrite((const void *) buf, 1, (size_t) sz_buf, fh);
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} else {
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duk_push_string(ctx, " ");
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duk_insert(ctx, 0);
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duk_concat(ctx, nargs);
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fprintf(fh, "%s\n", duk_require_string(ctx, -1));
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}
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#if defined(DUK_PRINT_ALERT_FLUSH)
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fflush(fh);
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#endif
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return 0;
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}
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#else
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/* Faster, less churn, higher footprint option. */
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static duk_ret_t duk__print_alert_helper(duk_context *ctx, FILE *fh) {
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duk_idx_t nargs;
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const duk_uint8_t *buf;
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duk_size_t sz_buf;
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const char nl = '\n';
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duk_uint8_t buf_stack[256];
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nargs = duk_get_top(ctx);
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/* If argument count is 1 and first argument is a buffer, write the buffer
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* as raw data into the file without a newline; this allows exact control
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* over stdout/stderr without an additional entrypoint (useful for now).
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* Otherwise current print/alert semantics are to ToString() coerce
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* arguments, join them with a single space, and append a newline.
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*/
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if (nargs == 1 && duk_is_buffer_data(ctx, 0)) {
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buf = (const duk_uint8_t *) duk_get_buffer_data(ctx, 0, &sz_buf);
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} else if (nargs > 0) {
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duk_idx_t i;
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duk_size_t sz_str;
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const duk_uint8_t *p_str;
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duk_uint8_t *p;
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sz_buf = (duk_size_t) nargs; /* spaces (nargs - 1) + newline */
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for (i = 0; i < nargs; i++) {
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(void) duk_to_lstring(ctx, i, &sz_str);
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sz_buf += sz_str;
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}
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if (sz_buf <= sizeof(buf_stack)) {
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p = (duk_uint8_t *) buf_stack;
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} else {
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p = (duk_uint8_t *) duk_push_fixed_buffer(ctx, sz_buf);
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}
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buf = (const duk_uint8_t *) p;
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for (i = 0; i < nargs; i++) {
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p_str = (const duk_uint8_t *) duk_get_lstring(ctx, i, &sz_str);
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memcpy((void *) p, (const void *) p_str, sz_str);
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p += sz_str;
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*p++ = (duk_uint8_t) (i == nargs - 1 ? '\n' : ' ');
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}
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} else {
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buf = (const duk_uint8_t *) &nl;
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sz_buf = 1;
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}
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/* 'buf' contains the string to write, 'sz_buf' contains the length
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* (which may be zero).
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*/
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if (sz_buf > 0) {
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fwrite((const void *) buf, 1, (size_t) sz_buf, fh);
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#if defined(DUK_PRINT_ALERT_FLUSH)
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fflush(fh);
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#endif
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}
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return 0;
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}
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#endif
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static duk_ret_t duk__print(duk_context *ctx) {
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return duk__print_alert_helper(ctx, stdout);
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}
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static duk_ret_t duk__alert(duk_context *ctx) {
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return duk__print_alert_helper(ctx, stderr);
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}
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void duk_print_alert_init(duk_context *ctx, duk_uint_t flags) {
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(void) flags; /* unused at the moment */
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/* XXX: use duk_def_prop_list(). */
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duk_push_global_object(ctx);
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duk_push_string(ctx, "print");
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duk_push_c_function(ctx, duk__print, DUK_VARARGS);
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duk_def_prop(ctx, -3, DUK_DEFPROP_HAVE_VALUE | DUK_DEFPROP_SET_WRITABLE | DUK_DEFPROP_SET_CONFIGURABLE);
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duk_push_string(ctx, "alert");
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duk_push_c_function(ctx, duk__alert, DUK_VARARGS);
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duk_def_prop(ctx, -3, DUK_DEFPROP_HAVE_VALUE | DUK_DEFPROP_SET_WRITABLE | DUK_DEFPROP_SET_CONFIGURABLE);
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duk_pop(ctx);
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}
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