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Function | Successful Return | Error Return |
|---|---|---|
| Character written |
|
| Wide character written |
|
| Nonnegative |
|
| Number of characters (nonnegative) | Negative |
| Number of wide characters (nonnegative) | Negative |
kill_dependency() | The input parameter | NA |
memcpy(), wmemcpy() | The destination input parameter | NA |
memmove(), wmemmove() | The destination input parameter | NA |
strcpy(), wcscpy() | The destination input parameter | NA |
strncpy(), wcsncpy() | The destination input parameter | NA |
strcat(), wcscat() | The destination input parameter | NA |
strncat(), wcsncat() | The destination input parameter | NA |
memset(), wmemset() | The destination input parameter | NA |
The return value of a call to fprintf() or one of its variants (vfprintf(), wfprintf() , vwfprintf()) may be ignored if the output is being directed to stdout or stderr . Otherwise, the return value must be checked.
If a function's return value is to be ignored, it is recommended that the function's return value function's results should be explicitly cast to to void to to signify the programmer's intent:
| Code Block | ||||
|---|---|---|---|---|
| ||||
int main() {
(void) printffprintf(stdout, "Hello, world\n"); // printffprintf() return value safely ignored
}
|
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