7109b7c066
The only user of login_prompt is the login tool. This implies that the first argument is always the same. It is much easier to verify printf's format string and its argument if both are next to each other. Signed-off-by: Samanta Navarro <ferivoz@riseup.net>
112 lines
2.3 KiB
C
112 lines
2.3 KiB
C
/*
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* SPDX-FileCopyrightText: 1989 - 1993, Julianne Frances Haugh
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* SPDX-FileCopyrightText: 1996 - 2000, Marek Michałkiewicz
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* SPDX-FileCopyrightText: 2003 - 2005, Tomasz Kłoczko
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* SPDX-FileCopyrightText: 2008 - 2011, Nicolas François
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <config.h>
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#ident "$Id$"
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#include <assert.h>
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#include <stdio.h>
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#include <signal.h>
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#include "alloc.h"
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#include "prototypes.h"
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#include "defines.h"
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#include "getdef.h"
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static void login_exit (unused int sig)
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{
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_exit (EXIT_FAILURE);
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}
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/*
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* login_prompt - prompt the user for their login name
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*
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* login_prompt() displays the standard login prompt. If ISSUE_FILE
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* is set in login.defs, this file is displayed before the prompt.
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*/
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void login_prompt (char *name, int namesize)
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{
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char buf[1024];
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#define MAX_ENV 32
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char *envp[MAX_ENV];
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char *cp;
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int i;
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FILE *fp;
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const char *fname = getdef_str ("ISSUE_FILE");
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sighandler_t sigquit;
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sighandler_t sigtstp;
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/*
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* There is a small chance that a QUIT character will be part of
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* some random noise during a prompt. Deal with this by exiting
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* instead of core dumping. Do the same thing for SIGTSTP.
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*/
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sigquit = signal (SIGQUIT, login_exit);
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sigtstp = signal (SIGTSTP, login_exit);
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/*
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* See if the user has configured the issue file to
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* be displayed and display it before the prompt.
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*/
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if (NULL != fname) {
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fp = fopen (fname, "r");
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if (NULL != fp) {
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while ((i = getc (fp)) != EOF) {
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(void) putc (i, stdout);
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}
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(void) fclose (fp);
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}
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}
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(void) gethostname (buf, sizeof buf);
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printf (_("\n%s login: "), buf);
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(void) fflush (stdout);
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/*
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* Read the user's response. The trailing newline will be
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* removed.
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*/
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memzero (buf, sizeof buf);
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if (fgets (buf, sizeof buf, stdin) != buf) {
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exit (EXIT_FAILURE);
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}
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cp = strchr (buf, '\n');
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if (NULL == cp) {
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exit (EXIT_FAILURE);
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}
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*cp = '\0'; /* remove \n [ must be there ] */
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/*
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* Skip leading whitespace. This makes " username" work right.
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* Then copy the rest (up to the end) into the username.
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*/
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for (cp = buf; *cp == ' ' || *cp == '\t'; cp++);
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for (i = 0; i < namesize - 1 && *cp != '\0'; name[i++] = *cp++);
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name[i] = '\0';
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/*
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* Set the SIGQUIT handler back to its original value
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*/
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(void) signal (SIGQUIT, sigquit);
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(void) signal (SIGTSTP, sigtstp);
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}
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