kolibrios-fun/programs/develop/ktcc/trunk/libc.obj/source/stdio/ungetc.c

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#include <stdio.h>
#include <errno.h>
// non standard realization - support for virtually change ONLY ONE char
int ungetc(int c, FILE* file)
{
int res;
if(!file){
errno = EBADF;
return EOF;
}
if (file->mode != _FILEMODE_R){
errno = EACCES;
return EOF;
}
if (file->position == 0 || c == EOF)
{
errno = EOF;
return EOF;
}
file->__ungetc_emu_buff = c;
file->position--;
return c;
}