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Correct some getopt() logic

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1. Null pointer dereference:

-  for (ndx = 0; longopts[ndx].name[0] != '\0'; ndx++)
+  for (ndx = 0; longopts[ndx].name != NULL; ndx++)

2. Handle single character long options.  An option like -x could be either a short option or a long option (under getopt_long_only()).  This case was not being handled correctly.

3. Add missing support for optional arguments to short options (indicated with two "::"

This effects all members of the getopt() family of APIs.

Tested on the simulator using extensions to apps/testing/ostest.
This commit is contained in:
Gregory Nutt 2021-04-02 08:34:25 -06:00 committed by Abdelatif Guettouche
parent b7c451c5a4
commit af3c76bb53
1 changed files with 39 additions and 20 deletions
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59
libs/libc/unistd/lib_getopt_common.c
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@ -69,7 +69,7 @@ static int getopt_long_option(FAR struct getopt_s *go,
* The last element of the option arry must be filled with zeroes.
*/
for (ndx = 0; longopts[ndx].name[0] != '\0'; ndx++)
for (ndx = 0; longopts[ndx].name != NULL; ndx++)
{
if (strcmp(go->go_optptr, longopts[ndx].name) == 0)
{
@ -99,6 +99,7 @@ static int getopt_long_option(FAR struct getopt_s *go,
if (next == NULL || next[0] == '-')
{
go->go_optptr = NULL;
go->go_optarg = NULL;
go->go_optind++;
break;
}
@ -168,7 +169,6 @@ static int getopt_long_option(FAR struct getopt_s *go,
/* This option is not in the list of valid options */
go->go_optopt = *go->go_optptr;
go->go_optptr++;
return '?';
errout:
@ -251,6 +251,8 @@ int getopt_common(int argc, FAR char * const argv[],
FAR int *longindex,
enum getopt_mode_e mode)
{
int ret;
/* Get thread-specific getopt() variables */
FAR struct getopt_s *go = getoptvars();
@ -360,19 +362,22 @@ int getopt_common(int argc, FAR char * const argv[],
/* go->go_optptr now points at the next option and it is not something
* crazy. Possibilities:
*
* -o
* -o reqarg
* -option
* -option reqarg
* -option optarg
* --option reqarg
* --option optarg
* FORM APPLICABILITY
* -o getopt(), getopt_long_only()
* -o reqarg getopt(), getopt_long_only()
* -o optarg getopt_long_only()
* -option getopt_long_only()
* -option reqarg getopt_long_only()
* -option optarg getopt_long_only()
* --option getopt_long(), getopt_long_only()
* --option reqarg getopt_long(), getopt_long_only()
* --option optarg getopt_long(), getopt_long_only()
*
* Where:
* o - Some short option
* option - Some long option
* reqarg - A required argument
* optarg - An optional argument
* o - Some short option
* option - Some long option
* reqarg - A required argument
* optarg - An optional argument
*/
/* Check for --option forms or -option forms */
@ -396,14 +401,25 @@ int getopt_common(int argc, FAR char * const argv[],
* must be distinguished from the -o case forms.
*/
if (GETOPT_HAVE_LONGONLY(mode) && *(go->go_optptr + 1) != '\0')
else if (GETOPT_HAVE_LONGONLY(mode))
{
return getopt_long_option(go, argv, longopts, longindex);
/* A special case is that the option is of a form like
* -o but is represented as a single character long option.
* In that case, getopt_long_option() will fail with '?' and,
* if it is a single character option, we can just fall
* through to the short option logic.
*/
ret = getopt_long_option(go, argv, longopts, longindex);
if (ret != '?' || *(go->go_optptr + 1) != '\0')
{
return ret;
}
}
}
/* Check if the option is in the list of valid short options.
* In long option modes, opstring may be NULL. However, but that is
* In long option modes, opstring may be NULL. However, that is
* an error in any case here because we have not found any
* long options.
*/
@ -435,8 +451,8 @@ int getopt_common(int argc, FAR char * const argv[],
return *optchar;
}
/* Yes, it has a required argument. Is the required argument
* immediately after the command in this same argument?
/* Yes, it may have an argument. Is the argument immediately after
* the command in this same argument?
*/
if (go->go_optptr[1] != '\0')
@ -449,7 +465,7 @@ int getopt_common(int argc, FAR char * const argv[],
return *optchar;
}
/* No.. is the optional argument the next argument in argv[] ? */
/* No.. is there an argument in the next value of argv[] ? */
if (argv[go->go_optind + 1] && *argv[go->go_optind + 1] != '-')
{
@ -467,7 +483,10 @@ int getopt_common(int argc, FAR char * const argv[],
go->go_optarg = NULL;
go->go_optopt = *optchar;
go->go_optind++;
return noarg_ret;
/* Two colons means that the argument is optional. */
return (optchar[2] == ':') ? *optchar : noarg_ret;
}
errout: