e2sm/lib/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                 va_end(args);
  21                 return -1;
  22             }
  23             break;
  24         }
  25
  26         buf_size <<= 1;
  27         if(buf == scratch) {
  28             buf = MALLOC(buf_size);
  29             if(!buf) { va_end(args); return -1; }
  30         } else {
  31             void *p = REALLOC(buf, buf_size);
  32             if(!p) {
  33                 FREEMEM(buf);
  34                 va_end(args);
  35                 return -1;
  36             }
  37             buf = p;
  38         }
  39     } while(1);
  40
  41     cb_ret = cb(buf, wrote, key);
  42     if(buf != scratch) FREEMEM(buf);
  43     if(cb_ret < 0) {
  44         return -1;
  45     }
  46
  47     return wrote;
  48 }
  49