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28 lines
428 B
C
28 lines
428 B
C
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/*
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* ftell.c
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*
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* Christian Groessler, 07-Aug-2000
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*/
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#include <stdio.h>
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#include <errno.h>
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#include <fcntl.h>
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#include "_file.h"
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long ftell(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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pos = lseek(f->f_fd, 0L, SEEK_CUR);
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return pos; /* -1 for error, comes from lseek() */
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}
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