70 lines
1.9 KiB
C
70 lines
1.9 KiB
C
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/*
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* Fixed buffer helper useful for debugging, requires no allocation
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* which is critical for debugging.
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*/
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#include "duk_internal.h"
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#if defined(DUK_USE_DEBUG)
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DUK_INTERNAL void duk_fb_put_bytes(duk_fixedbuffer *fb, const duk_uint8_t *buffer, duk_size_t length) {
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duk_size_t avail;
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duk_size_t copylen;
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avail = (fb->offset >= fb->length ? (duk_size_t) 0 : (duk_size_t) (fb->length - fb->offset));
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if (length > avail) {
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copylen = avail;
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fb->truncated = 1;
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} else {
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copylen = length;
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}
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duk_memcpy_unsafe(fb->buffer + fb->offset, buffer, copylen);
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fb->offset += copylen;
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}
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DUK_INTERNAL void duk_fb_put_byte(duk_fixedbuffer *fb, duk_uint8_t x) {
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duk_fb_put_bytes(fb, (const duk_uint8_t *) &x, 1);
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}
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DUK_INTERNAL void duk_fb_put_cstring(duk_fixedbuffer *fb, const char *x) {
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duk_fb_put_bytes(fb, (const duk_uint8_t *) x, (duk_size_t) DUK_STRLEN(x));
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}
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DUK_INTERNAL void duk_fb_sprintf(duk_fixedbuffer *fb, const char *fmt, ...) {
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duk_size_t avail;
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va_list ap;
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va_start(ap, fmt);
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avail = (fb->offset >= fb->length ? (duk_size_t) 0 : (duk_size_t) (fb->length - fb->offset));
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if (avail > 0) {
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duk_int_t res = (duk_int_t) DUK_VSNPRINTF((char *) (fb->buffer + fb->offset), avail, fmt, ap);
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if (res < 0) {
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/* error */
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} else if ((duk_size_t) res >= avail) {
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/* (maybe) truncated */
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fb->offset += avail;
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if ((duk_size_t) res > avail) {
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/* actual chars dropped (not just NUL term) */
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fb->truncated = 1;
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}
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} else {
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/* normal */
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fb->offset += (duk_size_t) res;
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}
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}
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va_end(ap);
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}
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DUK_INTERNAL void duk_fb_put_funcptr(duk_fixedbuffer *fb, duk_uint8_t *fptr, duk_size_t fptr_size) {
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char buf[64+1];
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duk_debug_format_funcptr(buf, sizeof(buf), fptr, fptr_size);
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buf[sizeof(buf) - 1] = (char) 0;
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duk_fb_put_cstring(fb, buf);
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}
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DUK_INTERNAL duk_bool_t duk_fb_is_full(duk_fixedbuffer *fb) {
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return (fb->offset >= fb->length);
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}
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#endif /* DUK_USE_DEBUG */
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