ceph/src/civetweb/src/third_party/duktape-1.3.0/src-separate/duk_debug_fixedbuffer.c

   1 /*
   2  *  Fixed buffer helper useful for debugging, requires no allocation
   3  *  which is critical for debugging.
   4  */
   5
   6 #include "duk_internal.h"
   7
   8 #ifdef DUK_USE_DEBUG
   9
  10 DUK_INTERNAL void duk_fb_put_bytes(duk_fixedbuffer *fb, duk_uint8_t *buffer, duk_size_t length) {
  11         duk_size_t avail;
  12         duk_size_t copylen;
  13
  14         avail = (fb->offset >= fb->length ? (duk_size_t) 0 : (duk_size_t) (fb->length - fb->offset));
  15         if (length > avail) {
  16                 copylen = avail;
  17                 fb->truncated = 1;
  18         } else {
  19                 copylen = length;
  20         }
  21         DUK_MEMCPY(fb->buffer + fb->offset, buffer, copylen);
  22         fb->offset += copylen;
  23 }
  24
  25 DUK_INTERNAL void duk_fb_put_byte(duk_fixedbuffer *fb, duk_uint8_t x) {
  26         duk_fb_put_bytes(fb, &x, 1);
  27 }
  28
  29 DUK_INTERNAL void duk_fb_put_cstring(duk_fixedbuffer *fb, const char *x) {
  30         duk_fb_put_bytes(fb, (duk_uint8_t *) x, (duk_size_t) DUK_STRLEN(x));
  31 }
  32
  33 DUK_INTERNAL void duk_fb_sprintf(duk_fixedbuffer *fb, const char *fmt, ...) {
  34         duk_size_t avail;
  35         va_list ap;
  36
  37         va_start(ap, fmt);
  38         avail = (fb->offset >= fb->length ? (duk_size_t) 0 : (duk_size_t) (fb->length - fb->offset));
  39         if (avail > 0) {
  40                 duk_int_t res = (duk_int_t) DUK_VSNPRINTF((char *) (fb->buffer + fb->offset), avail, fmt, ap);
  41                 if (res < 0) {
  42                         /* error */
  43                 } else if ((duk_size_t) res >= avail) {
  44                         /* (maybe) truncated */
  45                         fb->offset += avail;
  46                         if ((duk_size_t) res > avail) {
  47                                 /* actual chars dropped (not just NUL term) */
  48                                 fb->truncated = 1;
  49                         }
  50                 } else {
  51                         /* normal */
  52                         fb->offset += res;
  53                 }
  54         }
  55         va_end(ap);
  56 }
  57
  58 DUK_INTERNAL void duk_fb_put_funcptr(duk_fixedbuffer *fb, duk_uint8_t *fptr, duk_size_t fptr_size) {
  59         char buf[64+1];
  60         duk_debug_format_funcptr(buf, sizeof(buf), fptr, fptr_size);
  61         buf[sizeof(buf) - 1] = (char) 0;
  62         duk_fb_put_cstring(fb, buf);
  63 }
  64
  65 DUK_INTERNAL duk_bool_t duk_fb_is_full(duk_fixedbuffer *fb) {
  66         return (fb->offset >= fb->length);
  67 }
  68
  69 #endif  /* DUK_USE_DEBUG */