error.c

#include "ptyspawn.h"

static void err_doit(int, int, const char * , va_list);

/*
 * Nonfatal error related to a system call.
 * Print a message and return.
 */
void err_ret(const char * fmt, ...) {
  va_list ap;

  va_start(ap, fmt);
  err_doit(1, errno, fmt, ap);
  va_end(ap);
}

/*
 * Fatal error related to a system call.
 * Print a message and terminate.
 */
void err_sys(const char * fmt, ...) {
  va_list ap;

  va_start(ap, fmt);
  err_doit(1, errno, fmt, ap);
  va_end(ap);
  exit(1);
}

/*
 * Nonfatal error unrelated to a system call.
 * Error code passed as explict parameter.
 * Print a message and return.
 */
void err_cont(int error,
  const char * fmt, ...) {
  va_list ap;

  va_start(ap, fmt);
  err_doit(1, error, fmt, ap);
  va_end(ap);
}

/*
 * Fatal error unrelated to a system call.
 * Error code passed as explict parameter.
 * Print a message and terminate.
 */
void err_exit(int error,
  const char * fmt, ...) {
  va_list ap;

  va_start(ap, fmt);
  err_doit(1, error, fmt, ap);
  va_end(ap);
  exit(1);
}

/*
 * Fatal error related to a system call.
 * Print a message, dump core, and terminate.
 */
void err_dump(const char * fmt, ...) {
  va_list ap;

  va_start(ap, fmt);
  err_doit(1, errno, fmt, ap);
  va_end(ap);
  abort(); /* dump core and terminate */
  exit(1); /* shouldn't get here */
}

/*
 * Nonfatal error unrelated to a system call.
 * Print a message and return.
 */
void err_msg(const char * fmt, ...) {
  va_list ap;

  va_start(ap, fmt);
  err_doit(0, 0, fmt, ap);
  va_end(ap);
}

/*
 * Fatal error unrelated to a system call.
 * Print a message and terminate.
 */
void err_quit(const char * fmt, ...) {
  va_list ap;

  va_start(ap, fmt);
  err_doit(0, 0, fmt, ap);
  va_end(ap);
  exit(1);
}

/*
 * Print a message and return to caller.
 * Caller specifies "errnoflag".
 */
static void err_doit(int errnoflag, int error, const char * fmt, va_list ap) {
  char buf[MAXLINE];

  vsnprintf(buf, MAXLINE - 1, fmt, ap);
  if (errnoflag)
    snprintf(buf + strlen(buf), MAXLINE - strlen(buf) - 1, ": %s", strerror(error));
  strcat(buf, "\n");
  fflush(stdout); /* in case stdout and stderr are the same */
  fputs(buf, stderr);
  fflush(NULL); /* flushes all stdio output streams */
}