UNIX Environment advanced Programming-Error handling function __unix

UNIX Environment Advanced Programming book the error-handling functions that are often used by the sample programs.

Save these functions in a file for easy learning and use.

My_err.h

#include <errno.h> #include <stdarg.h> static void Err_doit (int, const char*, va_list);

char *pname = NULL;
void Err_ret (const char *FMT, ...)
    {va_list ap;
    Va_start (AP, FMT);
    Err_doit (1, FMT, AP);
    Va_end (AP);
return;
} void Err_sys (const char *FMT, ...)
    {va_list ap;
    Va_start (AP, FMT);
    Err_doit (1, FMT, AP);
    Va_end (AP);
Exit (1);
} void Err_dump (const char *FMT, ...)
    {va_list ap;
    Va_start (AP, FMT);
    Err_doit (1, FMT, AP);
    Va_end (AP);
    Abort ();
Exit (1);
} void Err_msg (const char *FMT, ...)
    {va_list ap;
    Va_start (AP, FMT);
    Err_doit (0, FMT, AP);
    Va_end (AP);
return;
} void Err_quit (const char *FMT, ...)
    {va_list ap;
    Va_start (AP, FMT);
    Err_doit (0, FMT, AP);
    Va_end (AP);
Exit (1);
    static void Err_doit (int errnoflag, const char *FMT, va_list ap) {int errno_save;
    
    Char Buf[maxline];
    Errno_save = errno;
    vsprintf (BUF, FMT, AP);
        if (Errnoflag)sprintf (Buf+strlen (BUF), ":%s", Strerror (Errno_save));
    strcat (buf, "\ n");
    Fflush (stdout);
    Fputs (buf, stderr);
    Fflush (NULL);
return; }

My_log.h

#include <errno.h> #include <stdarg.h> #include <syslog.h> #include "ourhdr.h" static void Log_doit (in

t, int, const char*, va_list AP);

extern int debug; 

void Log_open (const char *ident, int option, int facility) {if (debug==0) openlog (Ident, option, facility);
void Log_ret (const char *FMT, ...)
    {va_list ap;
    Va_start (AP, FMT);
    Log_doit (1, Log_err, FMT, AP);
    Va_end (AP);
return;
} void Log_sys (const char *FMT, ...)
    {va_list ap;
    Va_start (AP, FMT);
    Log_doit (1, Log_err, FMT, AP);
    Va_end (AP);
Exit (2);
} void Log_msg (const char *FMT, ...)
    {va_list ap;
    Va_start (AP, FMT);
    Log_doit (0, Log_err, FMT, AP);
    Va_end (AP);
return;
} void Log_quit (const char *FMT, ...)
    {va_list ap;
    Va_start (AP, FMT);
    Log_doit (0, Log_err, FMT, AP);
    Va_end (AP);
Exit (2);
    static void Log_doit (int errnoflag, int priority, const char *FMT, va_list ap) {int errno_save;
    
Char Buf[maxline];    Errno_save = errno;
    vsprintf (BUF, FMT, AP);
    if (Errnoflag) sprintf (Buf+strlen (BUF), ":%s", Strerror (Errno_save));
    strcat (buf, "\ n");
        if (Debug) {fflush (stdout);
        Fputs (buf, stderr);
    Fflush (stderr);
    else Syslog (priority, BUF);
return; }