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47 lines
921 B
C
47 lines
921 B
C
/*
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* ftell.c
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*
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* Christian Groessler, 2000-08-07
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* Ullrich von Bassewitz, 2004-05-13
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*/
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#include <stdio.h>
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#include <errno.h>
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#include <unistd.h>
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#include "_file.h"
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/*****************************************************************************/
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/* Code */
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/*****************************************************************************/
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long __fastcall__ ftell (register FILE* f)
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{
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long pos;
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/* Is the file open? */
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if ((f->f_flags & _FOPEN) == 0) {
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_errno = EINVAL; /* File not open */
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return -1L;
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}
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/* Call the low level function */
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pos = lseek (f->f_fd, 0L, SEEK_CUR);
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/* If we didn't have an error, correct the return value in case we have
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* a pushed back character.
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*/
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if (pos > 0 && (f->f_flags & _FPUSHBACK)) {
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--pos;
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}
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/* -1 for error, comes from lseek() */
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return pos;
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}
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