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LibC: Various stdio correctness fixes.

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This commit is contained in:
Andreas Kling 2019-04-27 16:19:11 +02:00
parent 679ac386eb
commit 100cb2a237
1 changed files with 22 additions and 11 deletions
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33
LibC/stdio.cpp
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@ -95,16 +95,19 @@ int feof(FILE* stream)
int fflush(FILE* stream)
{
// FIXME: Implement buffered streams, duh.
if (!stream)
return -EBADF;
// FIXME: fflush(NULL) should flush all open output streams.
ASSERT(stream);
if (!stream->buffer_index)
return 0;
int rc = write(stream->fd, stream->buffer, stream->buffer_index);
stream->buffer_index = 0;
if (rc < 0)
stream->error = 0;
stream->eof = 0;
if (rc < 0) {
stream->error = errno;
return rc;
return EOF;
}
return 0;
}
char* fgets(char* buffer, int size, FILE* stream)
@ -155,6 +158,8 @@ int getchar()
int ungetc(int c, FILE* stream)
{
ASSERT(stream);
if (stream->have_ungotten)
return EOF;
stream->have_ungotten = true;
stream->ungotten = c;
stream->eof = false;
@ -170,7 +175,7 @@ int fputc(int ch, FILE* stream)
fflush(stream);
else if (stream->mode == _IONBF || (stream->mode == _IOLBF && ch == '\n'))
fflush(stream);
if (stream->eof)
if (stream->eof || stream->error)
return EOF;
return (byte)ch;
}
@ -192,14 +197,14 @@ int fputs(const char* s, FILE* stream)
if (rc == EOF)
return EOF;
}
return 0;
return 1;
}
int puts(const char* s)
{
int rc = fputs(s, stdout);
if (rc < 0)
return rc;
if (rc == EOF)
return EOF;
return fputc('\n', stdout);
}
@ -250,28 +255,34 @@ size_t fwrite(const void* ptr, size_t size, size_t nmemb, FILE* stream)
{
assert(stream);
int rc = fflush(stream);
if (rc < 0)
if (rc == EOF)
return 0;
ssize_t nwritten = write(stream->fd, ptr, nmemb * size);
if (nwritten < 0) {
stream->error = errno;
return 0;
}
return nwritten;
return nwritten / size;
}
int fseek(FILE* stream, long offset, int whence)
{
assert(stream);
fflush(stream);
off_t off = lseek(stream->fd, offset, whence);
if (off < 0)
return off;
stream->eof = false;
stream->error = 0;
stream->have_ungotten = false;
stream->ungotten = 0;
return 0;
}
long ftell(FILE* stream)
{
assert(stream);
fflush(stream);
return lseek(stream->fd, 0, SEEK_CUR);
}