BADFUNC.STDIO_H : Use of <stdio.h> Input/Output

Summary

A use of one of the following, declared in <stdio.h>, when defined as a function: clearerr(), ctermid(), cuserid(), fclose(), fdopen(), feof(), ferror(), fflush(), fgetc(), fgetpos(), fgets(), fileno(), flockfile(), fopen(), fprintf(), fputc(), fputs(), fread(), freopen(), fscanf(), fseek(), fseeko(), fsetpos(), ftell(), ftello(), ftrylockfile(), funlockfile(), fwrite(), getc(), getchar(), getc_unlocked(), getchar_unlocked(), getopt(), gets(), getw(), pclose(), perror(), popen(), printf(), putc(), putchar(), putc_unlocked(), putchar_unlocked(), puts(), putw(), remove(), rename(), rewind(), scanf(), setbuf(), setvbuf(), snprintf(), sprintf(), sscanf(), tempnam(), tmpfile(), tmpnam(), ungetc(), vfprintf(), vprintf(), vsnprintf(), vsprintf().

These functions are associated with unspecified, undefined, and implementation-defined behaviors.

If your libc implementation defines these as macros, uses will instead be reported as Use of <stdio.h> Input/Output Macro warnings.

This class is a strict superset of Leftover Debug Code.

Categories

Properties

WARNING_FILTER += allow class="Use of <stdio.h> Input/Output"

Example

#include <stdio.h>

int get_answer(){
  int ans;
  ans = fgetc(stdin); /* Warning issued here:
                       * - 'Use of <stdio.h> Input/Output' if fgetc() implemented as a function
                       * - Use of <stdio.h> Input/Output Macro if fgetc() implemented as a macro
                       */
  if ((ans == (int)('Y')) || ans == (int)('y')){
    return 1;
  }
  return 0;
}       

Relevant Configuration File Parameters

This class is implemented using a BAD_FUNCTION_* rule set in the general template configuration file.

• To include an additional function or set of functions in the checks for this class, create a new set of BAD_FUNCTION_* rules in which the BAD_FUNCTION_REGEX setting matches the function or set of functions you want to check and the remaining rules match those in the other sets for this class.
• To remove a function or set of functions from the checks for this class, edit the configuration file to comment out the corresponding set of BAD_FUNCTION_* rules.

The following configuration file parameters affect checks for this warning class.

• BAD_FUNCTION_BASE_RANK
• BAD_FUNCTION_CATEGORIES
• BAD_FUNCTION_INFO
• BAD_FUNCTION_LINK
• BAD_FUNCTION_MESSAGE
• BAD_FUNCTION_RANK
• BAD_FUNCTION_REGEX
• BAD_FUNCTION_SIGNIFICANCE
• REPORT_SIMILAR_WARNINGS
• WARNING_FILTER