musl/src/stdio/fgetpos.c

#include "stdio_impl.h"

int fgetpos(FILE *restrict f, fpos_t *restrict pos)
{
	off_t off = __ftello(f);
	if (off < 0) return -1;
	*(long long *)pos = off;
	return 0;
}

LFS64(fgetpos);
initial check-in, version 0.5.0 2011-02-12 00:22:29 -05:00			`#include "stdio_impl.h"`

use restrict everywhere it's required by c99 and/or posix 2008 to deal with the fact that the public headers may be used with pre-c99 compilers, __restrict is used in place of restrict, and defined appropriately for any supported compiler. we also avoid the form [restrict] since older versions of gcc rejected it due to a bug in the original c99 standard, and instead use the form *restrict. 2012-09-06 22:44:55 -04:00			`int fgetpos(FILE restrict f, fpos_t restrict pos)`
initial check-in, version 0.5.0 2011-02-12 00:22:29 -05:00			`{`
			`off_t off = __ftello(f);`
			`if (off < 0) return -1;`
fix aliasing violations in fgetpos/fsetpos add a member of appropriate type to the fpos_t union so that accesses are well-defined. use long long instead of off_t since off_t is not always exposed in stdio.h and there's no namespace-clean alias for it. access is still performed using pointer casts rather than by naming the union member as a matter of style; to the extent possible, the naming of fields in opaque types defined in the public headers is not treated as an API contract with the implementation. access via the pointer cast is valid as long as the union has a member of matching type. 2018-02-24 16:45:33 -05:00			`(long long )pos = off;`
initial check-in, version 0.5.0 2011-02-12 00:22:29 -05:00			`return 0;`
			`}`

			`LFS64(fgetpos);`