github.com/afumu/libc@v0.0.6/musl/src/passwd/putgrent.c (about)

     1  #define _GNU_SOURCE
     2  #include <grp.h>
     3  #include <stdio.h>
     4  
     5  int putgrent(const struct group *gr, FILE *f)
     6  {
     7  	int r;
     8  	size_t i;
     9  	flockfile(f);
    10  	if ((r = fprintf(f, "%s:%s:%u:", gr->gr_name, gr->gr_passwd, gr->gr_gid))<0) goto done;
    11  	if (gr->gr_mem) for (i=0; gr->gr_mem[i]; i++)
    12  		if ((r = fprintf(f, "%s%s", i?",":"", gr->gr_mem[i]))<0) goto done;
    13  	r = fputc('\n', f);
    14  done:
    15  	funlockfile(f);
    16  	return r<0 ? -1 : 0;
    17  }