third_party/ulib/musl/src/network/proto.c

#include <netdb.h>
#include <string.h>

/* do we really need all these?? */

static int idx;
static const unsigned char protos[] = {"\000ip\0"
                                       "\001icmp\0"
                                       "\002igmp\0"
                                       "\003ggp\0"
                                       "\004ipencap\0"
                                       "\005st\0"
                                       "\006tcp\0"
                                       "\010egp\0"
                                       "\014pup\0"
                                       "\021udp\0"
                                       "\024hmp\0"
                                       "\026xns-idp\0"
                                       "\033rdp\0"
                                       "\035iso-tp4\0"
                                       "\044xtp\0"
                                       "\045ddp\0"
                                       "\046idpr-cmtp\0"
                                       "\051ipv6\0"
                                       "\053ipv6-route\0"
                                       "\054ipv6-frag\0"
                                       "\055idrp\0"
                                       "\056rsvp\0"
                                       "\057gre\0"
                                       "\062esp\0"
                                       "\063ah\0"
                                       "\071skip\0"
                                       "\072ipv6-icmp\0"
                                       "\073ipv6-nonxt\0"
                                       "\074ipv6-opts\0"
                                       "\111rspf\0"
                                       "\121vmtp\0"
                                       "\131ospf\0"
                                       "\136ipip\0"
                                       "\142encap\0"
                                       "\147pim\0"
                                       "\377raw"};

void endprotoent(void) {
    idx = 0;
}

void setprotoent(int stayopen) {
    idx = 0;
}

struct protoent* getprotoent(void) {
    static struct protoent p;
    static const char* aliases;
    if (idx >= sizeof protos)
        return NULL;
    p.p_proto = protos[idx];
    p.p_name = (char*)&protos[idx + 1];
    p.p_aliases = (char**)&aliases;
    idx += strlen(p.p_name) + 2;
    return &p;
}

struct protoent* getprotobyname(const char* name) {
    struct protoent* p;
    endprotoent();
    do
        p = getprotoent();
    while (p && strcmp(name, p->p_name));
    return p;
}

struct protoent* getprotobynumber(int num) {
    struct protoent* p;
    endprotoent();
    do
        p = getprotoent();
    while (p && p->p_proto != num);
    return p;
}