realname.c

/* realname.c - query the user's real name
 *
 * Copyright 1999, 2000, 2006  Jochen Voss  */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#ifdef _XOPEN_SOURCE
#define _XOPEN_SOURCE_EXTENDED 1
#endif

#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <sys/types.h>
#include <unistd.h>
#include <pwd.h>
#include <assert.h>

#if defined(__hp9000s800)
#include <stdarg.h>
#endif

#include "moon-buggy.h"


int
get_real_user_name (char *buffer, size_t size)
/* Query the real user name.
 * Store the result into BUFFER, but do not write more then SIZE
 * characters.  */
{
  int  res, start;
  char *tmp;

  if (buffer[0] == '\0') {
    uid_t me = geteuid ();
    struct passwd *my_passwd = getpwuid (me);
    if (my_passwd) {
      int  i;
      strncpy (buffer, my_passwd->pw_gecos, size);
      for (i=0; i<size; ++i) {
        if (buffer[i] == ',') {
          buffer[i] = '\0';
          break;
        }
      }
    }
  }

  werase (message);
  if (buffer[0] == '\0') {
    waddstr (message, "please enter your name: ");
  } else {
    char  tmpl [100];
    int  def_size;

    def_size = (COLS
                - size
                - strlen("please enter your name (default: \"\"): "));
    if (def_size >= (int)xstrnlen(buffer, size)) {
      sprintf (tmpl, "please enter your name (default: \"%%.%ds\"): ", (int)size);
    } else {
      def_size -= 2;
      if (def_size < 6)  def_size = 6;
      assert (size >= 8);
      sprintf (tmpl, "please enter your name (default: \"%%.%ds..\"): ",
               def_size);
    }
    wprintw (message, tmpl, buffer);
  }

  tmp = xmalloc (size+1);

  show_cursor ();
  echo ();
  res = wgetnstr (message, tmp, size);
  noecho ();
  hide_cursor ();

  start = 0;
  while (start < size && tmp[start] && isspace (tmp[start]))  ++start;
  if (start<size && tmp[start]) {
    strncpy (buffer, tmp+start, size-start);
    if (start>0)  buffer[size-start] = '\0';
  }
  free (tmp);
  return  res;
}