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added read buffering, ungetc

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git-svn-id: svn://kolibrios.org@7184 a494cfbc-eb01-0410-851d-a64ba20cac60
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siemargl
2018-03-12 20:41:06 +00:00
parent 751583e53e
commit 524cab3cd8
19 changed files with 1029 additions and 100 deletions
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11
programs/develop/ktcc/trunk/libc/stdio/ungetc.c
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@@ -1,5 +1,8 @@
#include <stdio.h>
// non standard realization - no support for virtually change char
// non standard realization - support for virtually change ONLY ONE char
int ungetc(int c,FILE* file)
{
dword res;
@@ -10,17 +13,19 @@ int ungetc(int c,FILE* file)
return EOF;
}
if ((file->mode & 3!=FILE_OPEN_READ) && (file->mode & FILE_OPEN_PLUS==0))
if ((file->mode & 3) != FILE_OPEN_READ && (file->mode & FILE_OPEN_PLUS) == 0)
{
errno = E_ACCESS;
return EOF;
}
if (file->filepos>file->filesize || file->filepos==0)
if (file->filepos > file->filesize || file->filepos == 0 || c == EOF || file->ungetc_buf != EOF)
{
errno = E_EOF;
return EOF;
}
file->ungetc_buf = c;
file->filepos--;
return c;