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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4973 | right-hear | 1 | /* Copyright (C) 1994 DJ Delorie, see COPYING.DJ for details */ |
| 2 | #include |
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| 3 | #include |
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| 4 | |||
| 5 | int |
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| 6 | ungetc(int c, FILE *f) |
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| 7 | { |
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| 8 | if (c == EOF |
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| 9 | || (f->_flag & (_IOREAD|_IORW)) == 0 |
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| 10 | || f->_ptr == NULL |
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| 11 | || f->_base == NULL) |
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| 12 | return EOF; |
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| 13 | |||
| 14 | if (f->_ptr == f->_base) |
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| 15 | { |
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| 16 | if (f->_cnt == 0) |
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| 17 | f->_ptr++; |
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| 18 | else |
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| 19 | return EOF; |
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| 20 | } |
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| 21 | |||
| 22 | f->_cnt++; |
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| 23 | *--f->_ptr = c; |
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| 24 | |||
| 25 | return c; |
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| 26 | } |