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apps/nshlib: Fix all places where cle() and readline() are used. readline() returns EOF on a failure. cle() returns a negated errno value. Checking only for EOF causes failues to be missed (and infinite loops ensuing).

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This commit is contained in:
Valmantas Paliksa
2019-05-21 08:43:09 -06:00
committed by Gregory Nutt
parent 891ea23356
commit 5cad41c973
5 changed files with 128 additions and 80 deletions
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53
nshlib/nsh_session.c
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@@ -1,7 +1,8 @@
/****************************************************************************
* apps/nshlib/nsh_session.c
*
* Copyright (C) 2007-2009, 2011-2014, 2016 Gregory Nutt. All rights reserved.
* Copyright (C) 2007-2009, 2011-2014, 2016, 2019 Gregory Nutt. All rights
* reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
@@ -142,31 +143,43 @@ int nsh_session(FAR struct console_stdio_s *pstate)
*/
#ifdef CONFIG_NSH_CLE
ret = cle(pstate->cn_line, CONFIG_NSH_LINELEN,
INSTREAM(pstate), OUTSTREAM(pstate));
#else
ret = readline(pstate->cn_line, CONFIG_NSH_LINELEN,
INSTREAM(pstate), OUTSTREAM(pstate));
#endif
if (ret != EOF)
{
/* Parse process the command */
(void)nsh_parse(vtbl, pstate->cn_line);
fflush(pstate->cn_outstream);
}
/* Readline normally returns the number of characters read,
* but will return EOF on end of file or if an error occurs.
* EOF will cause the session to terminate.
/* cle() normally returns the number of characters read, but will
* return a negated errno value on end of file or if an error occurs.
* Either will cause the session to terminate.
*/
else
ret = cle(pstate->cn_line, CONFIG_NSH_LINELEN,
INSTREAM(pstate), OUTSTREAM(pstate));
if (ret < 0)
{
fprintf(pstate->cn_errstream, g_fmtcmdfailed, "nsh_session",
"readline", NSH_ERRNO_OF(-ret));
"cle", NSH_ERRNO_OF(-ret));
return ret == 0 ? EXIT_SUCCESS : EXIT_FAILURE;
}
#else
/* readline() normally returns the number of characters read, but will
* return EOF on end of file or if an error occurs. EOF
* will cause the session to terminate.
*/
ret = readline(pstate->cn_line, CONFIG_NSH_LINELEN,
INSTREAM(pstate), OUTSTREAM(pstate));
if (ret == EOF)
{
/* NOTE: readline() does not set the errno variable, but perhaps we
* will be lucky and it will still be valid.
*/
fprintf(pstate->cn_errstream, g_fmtcmdfailed, "nsh_session",
"readline", NSH_ERRNO);
return ret == 0 ? EXIT_SUCCESS : EXIT_FAILURE;
}
#endif
/* Parse process the command */
(void)nsh_parse(vtbl, pstate->cn_line);
fflush(pstate->cn_outstream);
}
/* We do not get here, but this is necessary to keep some compilers happy.