source:
asp3_tinet_ecnl_rx/trunk/musl-1.1.18/src/stdio/ungetc.c
Last change on this file was 337, checked in by , 6 years ago | |
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File size: 263 bytes |
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1 | #include "stdio_impl.h" |
2 | |
3 | int ungetc(int c, FILE *f) |
4 | { |
5 | if (c == EOF) return c; |
6 | |
7 | FLOCK(f); |
8 | |
9 | if (!f->rpos) __toread(f); |
10 | if (!f->rpos || f->rpos <= f->buf - UNGET) { |
11 | FUNLOCK(f); |
12 | return EOF; |
13 | } |
14 | |
15 | *--f->rpos = c; |
16 | f->flags &= ~F_EOF; |
17 | |
18 | FUNLOCK(f); |
19 | return c; |
20 | } |
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