Compilare: user.c: In function ‘writeKeys’: user.c:87:21: warning: implicit declaration of function ‘strdup’ [-Wimplicit-function-declaration] prim = strdup(p); ^ user.c:87:26: warning: assignment makes pointer from integer without a cast [enabled by default] prim = strdup(p); ^ user.c: In function ‘writeValues’: user.c:34:14: warning: ignoring return value of ‘fgets’, declared with attribute warn_unused_result [-Wunused-result] fgets(line, 1025, f); ^ user.c: In function ‘writeKeys’: user.c:75:14: warning: ignoring return value of ‘fgets’, declared with attribute warn_unused_result [-Wunused-result] fgets(line, 1025, f); ^