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Posted to commits@nuttx.apache.org by GitBox <gi...@apache.org> on 2022/10/14 09:10:36 UTC
[GitHub] [incubator-nuttx] fjpanag opened a new issue, #7308: ungetc does not respect EOF.
fjpanag opened a new issue, #7308:
URL: https://github.com/apache/incubator-nuttx/issues/7308
The function `ungetc()` does not respect the `EOF` character.
If you try to unget an `EOF`, it will indeed be added into the `fs_ungotten[]` buffer, instead of returning with error.
Consider the following snippet:
```c
/* Get a character from a stream. */
int c = getc(f);
/* There were no characters to read. c == EOF */
assert(c == EOF);
/* ungetc does not detect this! It thinks its a normal character! */
ungetc(c, f);
/* Try to read a character again. It should be EOF. */
assert(getc(f) == EOF);
/* ERROR! getc() didn't return EOF! */
```
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[GitHub] [incubator-nuttx] pkarashchenko commented on issue #7308: ungetc does not respect EOF.
Posted by GitBox <gi...@apache.org>.
pkarashchenko commented on issue #7308:
URL: https://github.com/apache/incubator-nuttx/issues/7308#issuecomment-1278728226
Reread description again. All is clear
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[GitHub] [incubator-nuttx] xiaoxiang781216 closed issue #7308: ungetc does not respect EOF.
Posted by GitBox <gi...@apache.org>.
xiaoxiang781216 closed issue #7308: ungetc does not respect EOF.
URL: https://github.com/apache/incubator-nuttx/issues/7308
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[GitHub] [incubator-nuttx] pkarashchenko commented on issue #7308: ungetc does not respect EOF.
Posted by GitBox <gi...@apache.org>.
pkarashchenko commented on issue #7308:
URL: https://github.com/apache/incubator-nuttx/issues/7308#issuecomment-1278726551
According to https://en.cppreference.com/w/c/io/ungetc
`If ch equals EOF, the operation fails and the stream is not affected.`. So what is wrong with current behavior? Maybe I'm missing something from a description.
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