mailing list of musl libc

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 #include <shadow.h>
#include <stdio.h>

#define NUM(n) (n == -1 ? 0 : -1), (n == -1 ? 0 : n)
#define STR(s) (s ? s : "")

int putspent(const struct spwd *sp, FILE *f)
{
	return fprintf(f, "%s:%s:%.*ld:%.*ld:%.*ld:%.*ld:%.*ld:%.*ld:%.*lu\n",
		STR(sp->sp_namp), STR(sp->sp_pwdp), NUM(sp->sp_lstchg),
		NUM(sp->sp_min), NUM(sp->sp_max), NUM(sp->sp_warn),
		NUM(sp->sp_inact), NUM(sp->sp_expire), NUM(sp->sp_flag)) < 0 ? -1 : 0;
}