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If used improperly, ungetc() and ungetwc() can cause data to be truncated or lost.
Recommendation | Severity | Likelihood | Remediation Cost | Priority | Level |
|---|---|---|---|---|---|
FIO13-C | Medium | Probable | High | P4 | L3 |
Automated Detection
Tool | Version | Checker | Description | ||||||
|---|---|---|---|---|---|---|---|---|---|
| CodeSonar |
| (customization) | Users can implement a custom check that triggers a warning when ungetc() is called twice on the same stream without an intervening call to a read function or a file-positioning function. | ||||||
| Compass/ROSE |
Can detect simple violations of this recommendation. In particular, it warns when two calls to | |||||||||
| LDRA tool suite |
| 83 D | Partially implemented |
| PC-lint Plus |
| 2470 | Fully supported |
Related Vulnerabilities
Search for vulnerabilities resulting from the violation of this rule on the CERT website.
Bibliography
| [ISO/IEC 9899:2011] | Subclause 7.21.7.10, "The ungetc Function" |
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