/usr/include/io_lib/vlen.h is in libstaden-read-dev 1.12.4-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | #ifndef _VLEN_H_
#define _VLEN_H_
#ifdef __cplusplus
extern "C" {
#endif
extern int vflen(char *fmt, va_list ap);
extern int flen(char *fmt, ...);
#ifdef __cplusplus
}
#endif
#endif /* _VLEN_H_ */
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