ref: aaabcfa788b098048d80c6e7e89cb78c408071d6
dir: /inc/ar.h/
#define ARMAG "!<arch>\n" /* ar "magic number" */
#define SARMAG 8 /* strlen(ARMAG); */
#define ARFMAG "`\n"
struct ar_hdr {
char ar_name[16]; /* name */
char ar_date[12]; /* modification time */
char ar_uid[6]; /* user id */
char ar_gid[6]; /* group id */
char ar_mode[8]; /* octal file permissions */
char ar_size[10]; /* size in bytes */
char ar_fmag[2]; /* consistency check */
};