libs/smux/asn_internal.c

   1 #include <asn_internal.h>
   2
   3 ssize_t
   4 asn__format_to_callback(int (*cb)(const void *, size_t, void *key), void *key,
   5                         const char *fmt, ...) {
   6     char scratch[64];
   7     char *buf = scratch;
   8     size_t buf_size = sizeof(scratch);
   9     int wrote;
  10     int cb_ret;
  11
  12     do {
  13         va_list args;
  14         va_start(args, fmt);
  15
  16         wrote = vsnprintf(buf, buf_size, fmt, args);
  17         if(wrote < (ssize_t)buf_size) {
  18             if(wrote < 0) {
  19                 if(buf != scratch) FREEMEM(buf);
  20                 return -1;
  21             }
  22             break;
  23         }
  24
  25         buf_size <<= 1;
  26         if(buf == scratch) {
  27             buf = MALLOC(buf_size);
  28             if(!buf) return -1;
  29         } else {
  30             void *p = REALLOC(buf, buf_size);
  31             if(!p) {
  32                 FREEMEM(buf);
  33                 return -1;
  34             }
  35             buf = p;
  36         }
  37     } while(1);
  38
  39     cb_ret = cb(buf, wrote, key);
  40     if(buf != scratch) FREEMEM(buf);
  41     if(cb_ret < 0) {
  42         return -1;
  43     }
  44
  45     return wrote;
  46 }
  47