duktape-1.8.0/src-separate/duk_debug_fixedbuffer.c

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