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/* try.c */
#include <stdio.h>
...
 printf("%s\n", buf);
}

try.c: In function ‘foo’:
try.c:17:17: warning: ‘%.*g’ directive writing between 1 and 133 bytes
+ into a region of size 127 [-Wformat-overflow=]
...
  sprintf (buf, "%.*g", 126, d);
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~