C 語言最大難點揭秘[3]

　　清單 6. 識別資源的源代碼示例
               
 /********
  * ...
  *
  * Note that any function invoking protected_file_read()
  * assumes responsibility eventually to fclose() its
  * return value, UNLESS that value is NULL.
  *
  ********/
 FILE *protected_file_read(char *filename)
 {
     FILE *fp;

     fp = fopen(filename, "r");
     if (fp) {
  ...
     } else {
  ...
     }
     return fp;
 }

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