C++ xsnprintf函数代码示例

/* Override the to_store_registers routine.  */
static void
spu_store_registers (struct target_ops *ops,
		     struct regcache *regcache, int regno)
{
  struct gdbarch *gdbarch = get_regcache_arch (regcache);
  struct target_ops *ops_beneath = find_target_beneath (ops);
  int spufs_fd;
  CORE_ADDR spufs_addr;

  /* This version applies only if we're currently in spu_run.  */
  if (gdbarch_bfd_arch_info (gdbarch)->arch != bfd_arch_spu)
    {
      while (ops_beneath && !ops_beneath->to_fetch_registers)
	ops_beneath = find_target_beneath (ops_beneath);

      gdb_assert (ops_beneath);
      ops_beneath->to_store_registers (ops_beneath, regcache, regno);
      return;
    }

  /* We must be stopped on a spu_run system call.  */
  if (!parse_spufs_run (inferior_ptid, &spufs_fd, &spufs_addr))
    return;

  /* The NPC register is found in PPC memory at SPUFS_ADDR.  */
  if (regno == -1 || regno == SPU_PC_REGNUM)
    {
      gdb_byte buf[4];
      regcache_raw_collect (regcache, SPU_PC_REGNUM, buf);

      target_write (ops_beneath, TARGET_OBJECT_MEMORY, NULL,
		    buf, spufs_addr, sizeof buf);
    }

  /* The GPRs are found in the "regs" spufs file.  */
  if (regno == -1 || (regno >= 0 && regno < SPU_NUM_GPRS))
    {
      gdb_byte buf[16 * SPU_NUM_GPRS];
      char annex[32];
      int i;

      for (i = 0; i < SPU_NUM_GPRS; i++)
	regcache_raw_collect (regcache, i, buf + i*16);

      xsnprintf (annex, sizeof annex, "%d/regs", spufs_fd);
      target_write (ops_beneath, TARGET_OBJECT_SPU, annex,
		    buf, 0, sizeof buf);
    }
}

/* Convert style to a string. */
const char *
style_tostring(struct grid_cell *gc)
{
	int		 c, off = 0, comma = 0;
	static char	 s[256];

	*s = '\0';

	if (gc->fg != 8 || gc->flags & GRID_FLAG_FG256) {
		if (gc->flags & GRID_FLAG_FG256)
			c = gc->fg | 0x100;
		else
			c = gc->fg;
		off += xsnprintf(s, sizeof s, "fg=%s", colour_tostring(c));
		comma = 1;
	}

	if (gc->bg != 8 || gc->flags & GRID_FLAG_BG256) {
		if (gc->flags & GRID_FLAG_BG256)
			c = gc->bg | 0x100;
		else
			c = gc->bg;
		off += xsnprintf(s + off, sizeof s - off, "%sbg=%s",
		    comma ? "," : "", colour_tostring(c));
		comma = 1;
	}

	if (gc->attr != 0 && gc->attr != GRID_ATTR_CHARSET) {
		xsnprintf(s + off, sizeof s - off, "%s%s",
		    comma ? "," : "", attributes_tostring(gc->attr));
	}

	if (*s == '\0')
		return ("default");
	return (s);
}

char *
safe_strerror (int errnum)
{
  char *msg;

  msg = strerror (errnum);
  if (msg == NULL)
    {
      static char buf[32];

      xsnprintf (buf, sizeof buf, "(undocumented errno %d)", errnum);
      msg = buf;
    }
  return (msg);
}

void
server_fill_environ(struct session *s, struct environ *env)
{
	char		 tmuxvar[MAXPATHLEN], *term;
	u_int		 idx;

	if (session_index(s, &idx) != 0)
		fatalx("session not found");
	xsnprintf(tmuxvar, sizeof tmuxvar,
	    "%s,%ld,%u", socket_path, (long) getpid(), idx);
	environ_set(env, "TMUX", tmuxvar);

	term = options_get_string(&s->options, "default-terminal");
	environ_set(env, "TERM", term);
}

/*
 * fd is connected to the remote side; send the sideband data
 * over multiplexed packet stream.
 */
void send_sideband(int fd, int band, const char *data, ssize_t sz, int packet_max)
{
	const char *p = data;

	while (sz) {
		unsigned n;
		char hdr[5];

		n = sz;
		if (packet_max - 5 < n)
			n = packet_max - 5;
		if (0 <= band) {
			xsnprintf(hdr, sizeof(hdr), "%04x", n + 5);
			hdr[4] = band;
			write_or_die(fd, hdr, 5);
		} else {
			xsnprintf(hdr, sizeof(hdr), "%04x", n + 4);
			write_or_die(fd, hdr, 4);
		}
		write_or_die(fd, p, n);
		p += n;
		sz -= n;
	}
}

char *
makesocketpath(const char *label)
{
	char		base[PATH_MAX], realbase[PATH_MAX], *path, *s;
	struct stat	sb;
	u_int		uid;

	uid = getuid();
	if ((s = getenv("TMUX_TMPDIR")) != NULL && *s != '\0')
		xsnprintf(base, sizeof base, "%s/", s);
	else if ((s = getenv("TMPDIR")) != NULL && *s != '\0')
		xsnprintf(base, sizeof base, "%s/tmux-%u", s, uid);
	else
		xsnprintf(base, sizeof base, "%s/tmux-%u", _PATH_TMP, uid);

	if (mkdir(base, S_IRWXU) != 0 && errno != EEXIST)
		return (NULL);

	if (lstat(base, &sb) != 0)
		return (NULL);
	if (!S_ISDIR(sb.st_mode)) {
		errno = ENOTDIR;
		return (NULL);
	}
	if (sb.st_uid != uid || (!S_ISDIR(sb.st_mode) &&
		sb.st_mode & (S_IRWXG|S_IRWXO)) != 0) {
		errno = EACCES;
		return (NULL);
	}

	if (realpath(base, realbase) == NULL)
		strlcpy(realbase, base, sizeof realbase);

	xasprintf(&path, "%s/%s", realbase, label);
	return (path);
}

/* Indicate that the variant VAR has NUM_FPRS floating-point
   registers, and fill in the names array appropriately.  */
static void
set_variant_num_fprs (struct gdbarch_tdep *var, int num_fprs)
{
  int r;

  var->num_fprs = num_fprs;

  for (r = 0; r < num_fprs; ++r)
    {
      char buf[20];

      xsnprintf (buf, sizeof (buf), "fr%d", r);
      var->register_names[first_fpr_regnum + r] = xstrdup (buf);
    }
}

static void queue_directory(const unsigned char *sha1,
		struct strbuf *base, const char *filename,
		unsigned mode, int stage, struct archiver_context *c)
{
	struct directory *d;
	size_t len = st_add4(base->len, 1, strlen(filename), 1);
	d = xmalloc(st_add(sizeof(*d), len));
	d->up	   = c->bottom;
	d->baselen = base->len;
	d->mode	   = mode;
	d->stage   = stage;
	c->bottom  = d;
	d->len = xsnprintf(d->path, len, "%.*s%s/", (int)base->len, base->buf, filename);
	hashcpy(d->oid.hash, sha1);
}

void
cvs_server_static_directory(char *data)
{
	FILE *fp;
	char fpath[MAXPATHLEN];

	(void)xsnprintf(fpath, MAXPATHLEN, "%s/%s",
	    server_currentdir, CVS_PATH_STATICENTRIES);

	if ((fp = fopen(fpath, "w+")) == NULL) {
		cvs_log(LP_ERRNO, "%s", fpath);
		return;
	}
	(void)fclose(fp);
}

/* Convert colour to a string. */
const char *
colour_tostring(int c)
{
	static char	s[32];

	if (c & 0x100) {
		xsnprintf(s, sizeof s, "colour%u", c & ~0x100);
		return (s);
	}

	switch (c) {
	case 0:
		return ("black");
	case 1:
		return ("red");
	case 2:
		return ("green");
	case 3:
		return ("yellow");
	case 4:
		return ("blue");
	case 5:
		return ("magenta");
	case 6:
		return ("cyan");
	case 7:
		return ("white");
	case 8:
		return ("default");
	case 90:
		return ("brightblack");
	case 91:
		return ("brightred");
	case 92:
		return ("brightgreen");
	case 93:
		return ("brightyellow");
	case 94:
		return ("brightblue");
	case 95:
		return ("brightmagenta");
	case 96:
		return ("brightcyan");
	case 97:
		return ("brightwhite");
	}
	return (NULL);
}

void winansi_init(void)
{
	int con1, con2;
	char name[32];

	/* check if either stdout or stderr is a console output screen buffer */
	con1 = is_console(1);
	con2 = is_console(2);

	/* Also compute console bit for fd 0 even though we don't need the result here. */
	is_console(0);

	if (!con1 && !con2) {
#ifdef DETECT_MSYS_TTY
		/* check if stdin / stdout / stderr are MSYS2 pty pipes */
		detect_msys_tty(0);
		detect_msys_tty(1);
		detect_msys_tty(2);
#endif
		return;
	}

	/* create a named pipe to communicate with the console thread */
	xsnprintf(name, sizeof(name), "\\\\.\\pipe\\winansi%lu", GetCurrentProcessId());
	hwrite = CreateNamedPipe(name, PIPE_ACCESS_OUTBOUND,
		PIPE_TYPE_BYTE | PIPE_WAIT, 1, BUFFER_SIZE, 0, 0, NULL);
	if (hwrite == INVALID_HANDLE_VALUE)
		die_lasterr("CreateNamedPipe failed");

	hread = CreateFile(name, GENERIC_READ, 0, NULL, OPEN_EXISTING, 0, NULL);
	if (hread == INVALID_HANDLE_VALUE)
		die_lasterr("CreateFile for named pipe failed");

	/* start console spool thread on the pipe's read end */
	hthread = CreateThread(NULL, 0, console_thread, NULL, 0, NULL);
	if (hthread == INVALID_HANDLE_VALUE)
		die_lasterr("CreateThread(console_thread) failed");

	/* schedule cleanup routine */
	if (atexit(winansi_exit))
		die_errno("atexit(winansi_exit) failed");

	/* redirect stdout / stderr to the pipe */
	if (con1)
		hconsole1 = swap_osfhnd(1, duplicate_handle(hwrite));
	if (con2)
		hconsole2 = swap_osfhnd(2, duplicate_handle(hwrite));
}

size_t
cmd_print(struct cmd *cmd, char *buf, size_t len)
{
	size_t	off, used;

	off = xsnprintf(buf, len, "%s ", cmd->entry->name);
	if (off + 1 < len) {
		used = args_print(cmd->args, buf + off, len - off - 1);
		if (used == 0)
			off--;
		else
			off += used;
		buf[off] = '\0';
	}
	return (off);
}

static void
cli_field_int (struct ui_out *uiout, int fldno, int width,
	       enum ui_align alignment,
	       const char *fldname, int value)
{
  char buffer[20];	/* FIXME: how many chars long a %d can become? */
  cli_out_data *data = ui_out_data (uiout);

  if (data->suppress_output)
    return;
  xsnprintf (buffer, sizeof (buffer), "%d", value);

  /* Always go through the function pointer (virtual function call).
     We may have been extended.  */
  uo_field_string (uiout, fldno, width, alignment, fldname, buffer);
}

static void report_message(const char *prefix, const char *err, va_list params)
{
	int sz;
	char msg[4096];

	sz = xsnprintf(msg, sizeof(msg), "%s", prefix);
	sz += vsnprintf(msg + sz, sizeof(msg) - sz, err, params);
	if (sz > (sizeof(msg) - 1))
		sz = sizeof(msg) - 1;
	msg[sz++] = '\n';

	if (use_sideband)
		send_sideband(1, 2, msg, sz, use_sideband);
	else
		xwrite(2, msg, sz);
}

int
union_search(mnt_map *m, char *map, char *key, char **pval, time_t *tp)
{
  char *mapd = xstrdup(map + UNION_PREFLEN);
  char **v = strsplit(mapd, ':', '\"');
  char **p;
  size_t l;

  for (p = v; p[1]; p++) ;
  l = strlen(*p) + 5;
  *pval = xmalloc(l);
  xsnprintf(*pval, l, "fs:=%s", *p);
  XFREE(mapd);
  XFREE(v);
  return 0;
}