mirror of https://github.com/PrimeDecomp/prime.git
103 lines
2.2 KiB
C
103 lines
2.2 KiB
C
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#include <ansi_files.h>
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#include <errno.h>
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inline fpos_t _ftell(FILE* file) {
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int charsInUndoBuffer = 0;
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fpos_t position;
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unsigned char tmp_kind = file->mode.file_kind;
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if (!(tmp_kind == __disk_file || tmp_kind == __console_file) || file->state.error) {
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errno = EFPOS;
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return (-1L);
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}
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if (file->state.io_state == __neutral)
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return (file->position);
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position = file->buffer_pos + (file->buffer_ptr - file->buffer);
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if (file->state.io_state >= __rereading) {
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charsInUndoBuffer = file->state.io_state - __rereading + 1;
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position -= charsInUndoBuffer;
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}
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return (position);
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}
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long ftell(FILE* file) {
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long retval;
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retval = (long)_ftell(file);
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return retval;
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}
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int _fseek(FILE* file, fpos_t offset, int mode) {
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fpos_t position;
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__pos_proc pos_proc;
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unsigned char tmp_kind = file->mode.file_kind;
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if (!(tmp_kind == __disk_file) || file->state.error) {
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errno = EFPOS;
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return (-1);
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}
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if (file->state.io_state == __writing) {
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if (__flush_buffer(file, NULL) != __no_io_error) {
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set_error(file);
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errno = EFPOS;
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return (-1);
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}
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}
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if (mode == SEEK_CUR) {
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mode = SEEK_SET;
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if ((position = _ftell(file)) < 0)
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position = 0;
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offset += position;
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}
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if ((mode != SEEK_END) && (file->mode.io_mode != __read_write) &&
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((file->state.io_state == __reading) || (file->state.io_state == __rereading))) {
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if ((offset >= file->position) || offset < file->buffer_pos) {
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file->state.io_state = __neutral;
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} else {
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file->buffer_ptr = file->buffer + (offset - file->buffer_pos);
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file->buffer_len = file->position - offset;
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file->state.io_state = __reading;
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}
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} else {
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file->state.io_state = __neutral;
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}
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if (file->state.io_state == __neutral) {
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if ((pos_proc = file->position_proc) != 0 &&
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(*pos_proc)(file->handle, &offset, mode, file->idle_proc)) {
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set_error(file);
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errno = EFPOS;
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return (-1);
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}
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file->state.eof = 0;
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file->position = offset;
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file->buffer_len = 0;
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}
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return 0;
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}
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int fseek(FILE * file, long offset, int mode)
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{
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fpos_t real_offset = (fpos_t)offset;
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int retval;
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retval = _fseek(file, real_offset, mode);
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return(retval);
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}
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