int jl_sprintbuf(struct jl_printbuf *p, const char *msg, ...)
{
va_list ap;
char *t;
int size;
char buf[128];
/* user stack buffer first */
va_start(ap, msg);
size = vsnprintf(buf, 128, msg, ap);
va_end(ap);
/* if string is greater than stack buffer, then use dynamic string
with vasprintf. Note: some implementation of vsnprintf return -1
if output is truncated whereas some return the number of bytes that
would have been written - this code handles both cases. */
if(size == -1 || size > 127) {
va_start(ap, msg);
if((size = vasprintf(&t, msg, ap)) == -1) { va_end(ap); return -1; }
va_end(ap);
jl_printbuf_memappend(p, t, size);
free(t);
return size;
} else {
jl_printbuf_memappend(p, buf, size);
return size;
}
}
struct mtev_json_object *mtev_json_object_from_fd(int fd)
{
struct jl_printbuf *pb;
struct mtev_json_object *obj;
char buf[JSON_FILE_BUF_SIZE];
int ret;
if(!(pb = jl_printbuf_new())) {
MC_ERROR("mtev_json_object_from_fd: jl_printbuf_new failed%s\n", "");
return (struct mtev_json_object*)error_ptr(-1);
}
while((ret = read(fd, buf, JSON_FILE_BUF_SIZE)) > 0) {
jl_printbuf_memappend(pb, buf, ret);
}
if(ret < 0) {
MC_ABORT("mtev_json_object_from_fd: error reading fd %d: %s\n",
fd, strerror(errno));
jl_printbuf_free(pb);
return (struct mtev_json_object*)error_ptr(-1);
}
obj = mtev_json_tokener_parse(pb->buf);
jl_printbuf_free(pb);
return obj;
}
