C言語

main(int ac, char *av[])

* Handle interrupt character. Print score and exit. * static void intr(int dummy __unused) { showstats(1); exit(0); }

NCMD ncmd # a simple command type int backgnd int # set to run command in background args nodeptr # the arguments redirect nodeptr # list of file redirections lineno int

typedef struct tree_s { tree_t data; struct tree_s *left, *right; short bal; } tree;

tree_t tree_srch(tree **ppr_tree, int (*pfi_compare)(tree_t, tree_t), tree_t p_user) { ENTER(“tree_srch”)

if (*ppr_tree) { int i_comp = (*pfi_compare)(p_user, (**ppr_tree).data);

if (i_comp > 0) RET(tree_srch(&(**ppr_tree).right, pfi_compare, p_user))

if (i_comp < 0) RET(tree_srch(&(**ppr_tree).left, pfi_compare, p_user))

* not higher, not lower… this must be the one. * RET((**ppr_tree).data) }

* grounded. NOT found. * RET(NULL) }

int tree_trav(tree **ppr_tree, int (*pfi_uar)(tree_t)) { ENTER(“tree_trav”)

if (!*ppr_tree) RET(TRUE)

if (!tree_trav(&(**ppr_tree).left, pfi_uar)) RET(FALSE) if (!(*pfi_uar)((**ppr_tree).data)) RET(FALSE) if (!tree_trav(&(**ppr_tree).right, pfi_uar)) RET(FALSE) RET(TRUE) }

typedef struct tnode { op_t tn_op; * operator * type_t tn_type; / type / bool tn_lvalue:1; / node is lvalue / bool tn_cast:1; / if tn_op == CVT, it’s an explicit cast / bool tn_parenthesized:1; bool tn_sys:1; / in strict bool mode, allow mixture between

• bool and scalar, for code from system
• headers that may be a mixture between
• scalar types and bool

/ bool tn_system_dependent:1; / depends on sizeof or offsetof / union { struct { struct tnode *_tn_left; / (left) operand / struct tnode *_tn_right; / right operand / } tn_s; sym_t *_tn_sym; / symbol if op = NAME */ val_t *_tn_val; /* value if op = CON / strg_t *_tn_string; / string if op == STRING */ } tn_u; } tnode_t;

static struct wlist * lookup(const char *s) { struct wlist *wp;

for (wp = hashtab[hash(s)]; wp != NULL; wp = wp->next) if (*s = *wp->string && strcmp(s, wp->string) = 0) return wp; return NULL; }

prlex(FILE *fp, struct wordent *sp0) { struct wordent *sp;

sp = sp0->next; for (;;) { (void)fprintf(fp, “%s”, vis_str(sp->word)); sp = sp->next; if (sp = sp0) break; if (sp->word[0] ! ’\n’) (void) fputc(’ ’, fp); } }

static struct host_list { struct host_list *next; int family; union { struct in6_addr _addr6; struct in_addr _addr4; } addr; } *hosts;

search_host(struct sockaddr *sa) { struct host_list *hp;

if (!hosts) return 0;

for (hp = hosts; hp != NULL; hp = hp->next) { switch (hp->family) { case AF_INET6: if (!memcmp(&hp->addr6, &((struct sockaddr_in6 *)(void *)sa)->sin6_addr, sizeof (struct in6_addr))) return 1; break; case AF_INET: if (!memcmp(&hp->addr4, &((struct sockaddr_in *)(void *)sa)->sin_addr, sizeof (struct in_addr))) return 1; break; default: break; } } return 0; }

remember_host(struct sockaddr *sa) { struct host_list *hp;

if ((hp = malloc(sizeof(struct host_list))) == NULL) { err(1, “malloc”); * NOTREACHED * } hp->family = sa->sa_family; hp->next = hosts; switch (sa->sa_family) { case AF_INET6: (void)memcpy(&hp->addr6, &((struct sockaddr_in6 )(void *)sa)->sin6_addr, sizeof (struct in6_addr)); break; case AF_INET: (void)memcpy(&hp->addr4, &((struct sockaddr_in *)(void *)sa)->sin_addr, sizeof (struct in_addr)); break; default: errx(1, “unknown address family”); / NOTREACHED */ } hosts = hp; }

struct env_lst * env_undefine(const char *var, char *d) { struct env_lst *ep;

if ((ep = env_find(var)) != NULL) { ep->prev->next = ep->next; if (ep->next) ep->next->prev = ep->prev; if (ep->var) free(ep->var); if (ep->value) free(ep->value); free(ep); } return NULL; }

static const int year_lengths[2] = { DAYSPERNYEAR, DAYSPERLYEAR };

static const int mon_lengths[2][MONSPERYEAR] = { { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }, { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 } };

union record { unsigned char charptr[RECORDSIZE]; struct header { char name[NAMSIZ]; char mode[8]; char uid[8]; char gid[8]; char size[12]; char mtime[12]; char chksum[8]; char linkflag; char linkname[NAMSIZ]; char magic[8]; char uname[TUNMLEN]; char gname[TGNMLEN]; char devmajor[8]; char devminor[8]; } header; };

enum msg_type { CALL=0, REPLY=1 };

struct rpc_msg { uint32_t rm_xid; enum msg_type rm_direction; union { struct call_body RM_cmb; struct reply_body RM_rmb; } ru;

union overhead { union overhead ov_next; / when free / struct { u_char ovu_magic; / magic number / u_char ovu_index; / bucket # / #ifdef RCHECK u_short ovu_rmagic; / range magic number / u_long ovu_size; / actual block size */ #endif } ovu; #define ov_magic ovu.ovu_magic #define ov_index ovu.ovu_index #define ov_rmagic ovu.ovu_rmagic #define ov_size ovu.ovu_size };

struct fxp_cb_nop { volatile uint16_t cb_status; volatile uint16_t cb_command; volatile uint32_t link_addr; };

struct tcphdr { uint16_t th_sport; * source port * uint16_t th_dport; * destination port * tcp_seq th_seq; * sequence number * tcp_seq th_ack; * acknowledgement number * uint8_t th_offx2; * data offset, rsvd * uint8_t th_flags; uint16_t th_win; * window * uint16_t th_sum; * checksum * uint16_t th_urp; * urgent pointer * } UNALIGNED;

strlen(const char *str) { const char *s;

for (s = str; *s; ++s) continue; return(s - str); }

for (;;) { char *buf = malloc (buf_size); if (!buf) return NULL; if (getcwd (buf, buf_size) = buf) return buf; free (buf); if (errno ! ERANGE || buf_size = bufsize_max) return NULL; buf_size = buf_size < bufsize_max / 2 ? 2 * buf_size : bufsize_max; }

all me

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