unp.h

unp.h

#ifndef _UNP_H_
#define _UNP_H_
 
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <fcntl.h>
#include <stdarg.h>
#include <signal.h>
#include <string.h> /* for strerror */
#include <sys/wait.h>
#include <sys/select.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/types.h>
 
#define MAXLINE 4096
#define SERV_PORT 6666
typedef void Sigfunc(int);
#define max(a,b) a>b?a:b
 
ssize_t readn(int fd,void *ptr,size_t n);
ssize_t writen(int fd,const void *ptr,size_t n);
ssize_t Read(int fd,void *buff,size_t n);
void Write(int fd,const void *buff,size_t n);
char *Fgets(char *buff,int nbytes,FILE *fp);
int Fputs(const char *str,FILE *fp);
void Close(int fd);
 
void err_quit(char *fmt,...);
 
int Socket(int family,int type,int protocol);
void Connect(int sockfd,const struct sockaddr *servaddr,socklen_t addrlen);
void Bind(int sockfd,const struct sockaddr *myaddr,socklen_t addrlen);
void Listen(int sockfd,int backlog);
int Accept(int sockfd,struct sockaddr *cliaddr,socklen_t *addrlen);
 
int Fork();
Sigfunc *Signal(int signo,Sigfunc *func);
int Select(int maxfdp1,fd_set *readsex,fd_set *writeset,fd_set *exceptset,
        struct timeval *timeout);
 
char *sock_ntop(const struct sockaddr *sockaddr, socklen_t addrlen);
 
#endif

unp.c

#include "unp.h"
 
ssize_t readn(int fd,void *ptr,size_t n){
    size_t nleft;
    ssize_t nread;
 
    nleft=n;
    while(nleft > 0){
        if((nread=read(fd,ptr,nleft)) <0){
            if(nleft == n)
                return -1;
            else
                break;
        }else if(nread == 0)
            break;
        nleft -= nread;
        ptr += nread;
    }
    return(n-nleft);
}
ssize_t writen(int fd,const void *ptr,size_t n){
    size_t nleft;
    ssize_t nwritten;
 
    nleft=n;
    while(nleft > 0){
        if((nwritten=write(fd,buff,nleft)) < 0){
            if(nleft == n)
                return -1;
            else
                break;
        }else if(nwritten == 0)
            break;
        nleft -= nwritten;
        ptr += nwritten;
    }
    return(n-nleft);
}
ssize_t Read(int fd,void *buff,size_t n){
    int nread;
    if((nread=read(fd,buff,n)) < 0)
        err_quit("read error");
    return nread;
}
void Write(int fd,const void *buff,size_t n){
    if(write(fd,buff,n) != n)
        err_quit("write error");
}
char *Fgets(char *buff,int nbytes,FILE *fp){
    char *ptr=fgets(buff,nbytes,fp);
    if(ptr==NULL && ferror(fp))
        err_quit("fgets error");
    return ptr;
}
int Fputs(const char *str,FILE *fp){
    int ret=fputs(str,fp);
    if(ret == EOF)
        err_quit("fputs error");
    return ret;
}
void Close(int fd){
    if(close(fd)<0)
        err_quit("close error");
}
 
void err_quit(char *fmt,...){
    int errno_save=errno;
    va_list va;
    va_start(va,fmt);
    vfprintf(stderr,fmt,va);
    if(errno_save != 0)
        fprintf(stderr," :%s",strerror(errno_save));
    fprintf(stderr,"\n");
    va_end(va);
    exit(0);
}
 
int Socket(int family,int type,int protocol){
    int sockfd=socket(family,type,protocol);
    if(sockfd == -1)
        err_quit("socket error");
    return sockfd;
}
 
void Connect(int sockfd,const struct sockaddr *servaddr,socklen_t addrlen){
    if(connect(sockfd,servaddr,addrlen) == -1)
        err_quit("connect error");
}
 
void Bind(int sockfd,const struct sockaddr *myaddr,socklen_t addrlen){
    if(bind(sockfd,myaddr,addrlen) == -1)
        err_quit("bind error");
}
 
void Listen(int sockfd,int backlog){
    if(listen(sockfd,backlog) == -1)
        err_quit("listen error");
}
 
int Accept(int sockfd,struct sockaddr *cliaddr,socklen_t *addrlen){
    int connfd=accept(sockfd,cliaddr,addrlen);
    if(connfd < 0)
        err_quit("accept error");
    return connfd;
}
 
int Fork(){
    pid_t pid=fork();
    if(pid < 0)
        err_quit("fork error");
    return pid;
}
Sigfunc *Signal(int signo,Sigfunc *func){
    Sigfunc *sigfunc=signal(signo,func);
    if(sigfunc == SIG_ERR)
        err_quit("signal error");
    return sigfunc;
}
int Select(int maxfdp1,fd_set *readsex,fd_set *writeset,fd_set *exceptset,
        struct timeval *timeout){
    int ret;
    if((ret=select(maxfdp1,readsex,writeset,exceptset,timeout)) < 0)
        err_quit("select error");
    return ret;
}
 
char *sock_ntop(const struct sockaddr *sa, socklen_t addrlen){
    char portstr[8];
    static char str[128];
 
    switch(sa->sa_family){
        case AF_INET:{
                         struct sockaddr_in *sin=(struct sockaddr_in *)sa;
 
                         if(inet_ntop(AF_INET,&sin->sin_addr,str,sizeof(str)) == NULL)
                             return(NULL);
                         if(ntohs(sin->sin_port) != 0){
                             snprintf(portstr,sizeof(portstr),":%d",
                                     ntohs(sin->sin_port));
                             strcat(str,portstr);
                         }
                         return(str);
                     }
        case AF_INET6:{
                         struct sockaddr_in6 *sin=(struct sockaddr_in6 *)sa;
 
                         if(inet_ntop(AF_INET6,&sin->sin6_addr,str,sizeof(str)) == NULL)
                             return(NULL);
                         if(ntohs(sin->sin6_port) != 0){
                             snprintf(portstr,sizeof(portstr),":%d",
                                     ntohs(sin->sin6_port));
                             strcat(str,portstr);
                         }
                         return(str);
                     }
        default:
                      printf("unknown sockaddr family\n");
                      break;
    }
}