mirror of https://codeberg.org/nsxiv/nsxiv
add support for long-opts (#332)
Uses [optparse] to add support for long-opts. optparse is posix compliant with getopt(3) and thus would be backwards compatible. It does not have any dependency (not even the c standard library!) and is C89 compatible and thus fits our current code-style. [optparse]: https://github.com/skeeto/optparse Note that we're using a couple `pragma`-s to silence some harmless warnings. This should be portable because these pragma-s don't change the behavior of the program. Furthermore, C standard mandates that unknown pragma's should be ignored by the compiler and thus would not result in build failure on compilers which do not recognize them. Closes: https://codeberg.org/nsxiv/nsxiv/issues/328 Reviewed-on: https://codeberg.org/nsxiv/nsxiv/pulls/332 Reviewed-by: eylles <eylles@noreply.codeberg.org>pull/358/head
NRK
2 years ago
parent
d9f20a4122
commit
216f312578
@ -0,0 +1,403 @@
|
||||
/* Optparse --- portable, reentrant, embeddable, getopt-like option parser
|
||||
*
|
||||
* This is free and unencumbered software released into the public domain.
|
||||
*
|
||||
* To get the implementation, define OPTPARSE_IMPLEMENTATION.
|
||||
* Optionally define OPTPARSE_API to control the API's visibility
|
||||
* and/or linkage (static, __attribute__, __declspec).
|
||||
*
|
||||
* The POSIX getopt() option parser has three fatal flaws. These flaws
|
||||
* are solved by Optparse.
|
||||
*
|
||||
* 1) Parser state is stored entirely in global variables, some of
|
||||
* which are static and inaccessible. This means only one thread can
|
||||
* use getopt(). It also means it's not possible to recursively parse
|
||||
* nested sub-arguments while in the middle of argument parsing.
|
||||
* Optparse fixes this by storing all state on a local struct.
|
||||
*
|
||||
* 2) The POSIX standard provides no way to properly reset the parser.
|
||||
* This means for portable code that getopt() is only good for one
|
||||
* run, over one argv with one option string. It also means subcommand
|
||||
* options cannot be processed with getopt(). Most implementations
|
||||
* provide a method to reset the parser, but it's not portable.
|
||||
* Optparse provides an optparse_arg() function for stepping over
|
||||
* subcommands and continuing parsing of options with another option
|
||||
* string. The Optparse struct itself can be passed around to
|
||||
* subcommand handlers for additional subcommand option parsing. A
|
||||
* full reset can be achieved by with an additional optparse_init().
|
||||
*
|
||||
* 3) Error messages are printed to stderr. This can be disabled with
|
||||
* opterr, but the messages themselves are still inaccessible.
|
||||
* Optparse solves this by writing an error message in its errmsg
|
||||
* field. The downside to Optparse is that this error message will
|
||||
* always be in English rather than the current locale.
|
||||
*
|
||||
* Optparse should be familiar with anyone accustomed to getopt(), and
|
||||
* it could be a nearly drop-in replacement. The option string is the
|
||||
* same and the fields have the same names as the getopt() global
|
||||
* variables (optarg, optind, optopt).
|
||||
*
|
||||
* Optparse also supports GNU-style long options with optparse_long().
|
||||
* The interface is slightly different and simpler than getopt_long().
|
||||
*
|
||||
* By default, argv is permuted as it is parsed, moving non-option
|
||||
* arguments to the end. This can be disabled by setting the `permute`
|
||||
* field to 0 after initialization.
|
||||
*/
|
||||
#ifndef OPTPARSE_H
|
||||
#define OPTPARSE_H
|
||||
|
||||
#ifndef OPTPARSE_API
|
||||
# define OPTPARSE_API
|
||||
#endif
|
||||
|
||||
struct optparse {
|
||||
char **argv;
|
||||
int permute;
|
||||
int optind;
|
||||
int optopt;
|
||||
char *optarg;
|
||||
char errmsg[64];
|
||||
int subopt;
|
||||
};
|
||||
|
||||
enum optparse_argtype {
|
||||
OPTPARSE_NONE,
|
||||
OPTPARSE_REQUIRED,
|
||||
OPTPARSE_OPTIONAL
|
||||
};
|
||||
|
||||
struct optparse_long {
|
||||
const char *longname;
|
||||
int shortname;
|
||||
enum optparse_argtype argtype;
|
||||
};
|
||||
|
||||
/**
|
||||
* Initializes the parser state.
|
||||
*/
|
||||
OPTPARSE_API
|
||||
void optparse_init(struct optparse *options, char **argv);
|
||||
|
||||
/**
|
||||
* Read the next option in the argv array.
|
||||
* @param optstring a getopt()-formatted option string.
|
||||
* @return the next option character, -1 for done, or '?' for error
|
||||
*
|
||||
* Just like getopt(), a character followed by no colons means no
|
||||
* argument. One colon means the option has a required argument. Two
|
||||
* colons means the option takes an optional argument.
|
||||
*/
|
||||
OPTPARSE_API
|
||||
int optparse(struct optparse *options, const char *optstring);
|
||||
|
||||
/**
|
||||
* Handles GNU-style long options in addition to getopt() options.
|
||||
* This works a lot like GNU's getopt_long(). The last option in
|
||||
* longopts must be all zeros, marking the end of the array. The
|
||||
* longindex argument may be NULL.
|
||||
*/
|
||||
OPTPARSE_API
|
||||
int optparse_long(struct optparse *options,
|
||||
const struct optparse_long *longopts,
|
||||
int *longindex);
|
||||
|
||||
/**
|
||||
* Used for stepping over non-option arguments.
|
||||
* @return the next non-option argument, or NULL for no more arguments
|
||||
*
|
||||
* Argument parsing can continue with optparse() after using this
|
||||
* function. That would be used to parse the options for the
|
||||
* subcommand returned by optparse_arg(). This function allows you to
|
||||
* ignore the value of optind.
|
||||
*/
|
||||
OPTPARSE_API
|
||||
char *optparse_arg(struct optparse *options);
|
||||
|
||||
/* Implementation */
|
||||
#ifdef OPTPARSE_IMPLEMENTATION
|
||||
|
||||
#define OPTPARSE_MSG_INVALID "invalid option"
|
||||
#define OPTPARSE_MSG_MISSING "option requires an argument"
|
||||
#define OPTPARSE_MSG_TOOMANY "option takes no arguments"
|
||||
|
||||
static int
|
||||
optparse_error(struct optparse *options, const char *msg, const char *data)
|
||||
{
|
||||
unsigned p = 0;
|
||||
const char *sep = " -- '";
|
||||
while (*msg)
|
||||
options->errmsg[p++] = *msg++;
|
||||
while (*sep)
|
||||
options->errmsg[p++] = *sep++;
|
||||
while (p < sizeof(options->errmsg) - 2 && *data)
|
||||
options->errmsg[p++] = *data++;
|
||||
options->errmsg[p++] = '\'';
|
||||
options->errmsg[p++] = '\0';
|
||||
return '?';
|
||||
}
|
||||
|
||||
OPTPARSE_API
|
||||
void
|
||||
optparse_init(struct optparse *options, char **argv)
|
||||
{
|
||||
options->argv = argv;
|
||||
options->permute = 1;
|
||||
options->optind = argv[0] != 0;
|
||||
options->subopt = 0;
|
||||
options->optarg = 0;
|
||||
options->errmsg[0] = '\0';
|
||||
}
|
||||
|
||||
static int
|
||||
optparse_is_dashdash(const char *arg)
|
||||
{
|
||||
return arg != 0 && arg[0] == '-' && arg[1] == '-' && arg[2] == '\0';
|
||||
}
|
||||
|
||||
static int
|
||||
optparse_is_shortopt(const char *arg)
|
||||
{
|
||||
return arg != 0 && arg[0] == '-' && arg[1] != '-' && arg[1] != '\0';
|
||||
}
|
||||
|
||||
static int
|
||||
optparse_is_longopt(const char *arg)
|
||||
{
|
||||
return arg != 0 && arg[0] == '-' && arg[1] == '-' && arg[2] != '\0';
|
||||
}
|
||||
|
||||
static void
|
||||
optparse_permute(struct optparse *options, int index)
|
||||
{
|
||||
char *nonoption = options->argv[index];
|
||||
int i;
|
||||
for (i = index; i < options->optind - 1; i++)
|
||||
options->argv[i] = options->argv[i + 1];
|
||||
options->argv[options->optind - 1] = nonoption;
|
||||
}
|
||||
|
||||
static int
|
||||
optparse_argtype(const char *optstring, char c)
|
||||
{
|
||||
int count = OPTPARSE_NONE;
|
||||
if (c == ':')
|
||||
return -1;
|
||||
for (; *optstring && c != *optstring; optstring++);
|
||||
if (!*optstring)
|
||||
return -1;
|
||||
if (optstring[1] == ':')
|
||||
count += optstring[2] == ':' ? 2 : 1;
|
||||
return count;
|
||||
}
|
||||
|
||||
OPTPARSE_API
|
||||
int
|
||||
optparse(struct optparse *options, const char *optstring)
|
||||
{
|
||||
int type;
|
||||
char *next;
|
||||
char *option = options->argv[options->optind];
|
||||
options->errmsg[0] = '\0';
|
||||
options->optopt = 0;
|
||||
options->optarg = 0;
|
||||
if (option == 0) {
|
||||
return -1;
|
||||
} else if (optparse_is_dashdash(option)) {
|
||||
options->optind++; /* consume "--" */
|
||||
return -1;
|
||||
} else if (!optparse_is_shortopt(option)) {
|
||||
if (options->permute) {
|
||||
int index = options->optind++;
|
||||
int r = optparse(options, optstring);
|
||||
optparse_permute(options, index);
|
||||
options->optind--;
|
||||
return r;
|
||||
} else {
|
||||
return -1;
|
||||
}
|
||||
}
|
||||
option += options->subopt + 1;
|
||||
options->optopt = option[0];
|
||||
type = optparse_argtype(optstring, option[0]);
|
||||
next = options->argv[options->optind + 1];
|
||||
switch (type) {
|
||||
case -1: {
|
||||
char str[2] = {0, 0};
|
||||
str[0] = option[0];
|
||||
options->optind++;
|
||||
return optparse_error(options, OPTPARSE_MSG_INVALID, str);
|
||||
}
|
||||
case OPTPARSE_NONE:
|
||||
if (option[1]) {
|
||||
options->subopt++;
|
||||
} else {
|
||||
options->subopt = 0;
|
||||
options->optind++;
|
||||
}
|
||||
return option[0];
|
||||
case OPTPARSE_REQUIRED:
|
||||
options->subopt = 0;
|
||||
options->optind++;
|
||||
if (option[1]) {
|
||||
options->optarg = option + 1;
|
||||
} else if (next != 0) {
|
||||
options->optarg = next;
|
||||
options->optind++;
|
||||
} else {
|
||||
char str[2] = {0, 0};
|
||||
str[0] = option[0];
|
||||
options->optarg = 0;
|
||||
return optparse_error(options, OPTPARSE_MSG_MISSING, str);
|
||||
}
|
||||
return option[0];
|
||||
case OPTPARSE_OPTIONAL:
|
||||
options->subopt = 0;
|
||||
options->optind++;
|
||||
if (option[1])
|
||||
options->optarg = option + 1;
|
||||
else
|
||||
options->optarg = 0;
|
||||
return option[0];
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
OPTPARSE_API
|
||||
char *
|
||||
optparse_arg(struct optparse *options)
|
||||
{
|
||||
char *option = options->argv[options->optind];
|
||||
options->subopt = 0;
|
||||
if (option != 0)
|
||||
options->optind++;
|
||||
return option;
|
||||
}
|
||||
|
||||
static int
|
||||
optparse_longopts_end(const struct optparse_long *longopts, int i)
|
||||
{
|
||||
return !longopts[i].longname && !longopts[i].shortname;
|
||||
}
|
||||
|
||||
static void
|
||||
optparse_from_long(const struct optparse_long *longopts, char *optstring)
|
||||
{
|
||||
char *p = optstring;
|
||||
int i;
|
||||
for (i = 0; !optparse_longopts_end(longopts, i); i++) {
|
||||
if (longopts[i].shortname && longopts[i].shortname < 127) {
|
||||
int a;
|
||||
*p++ = longopts[i].shortname;
|
||||
for (a = 0; a < (int)longopts[i].argtype; a++)
|
||||
*p++ = ':';
|
||||
}
|
||||
}
|
||||
*p = '\0';
|
||||
}
|
||||
|
||||
/* Unlike strcmp(), handles options containing "=". */
|
||||
static int
|
||||
optparse_longopts_match(const char *longname, const char *option)
|
||||
{
|
||||
const char *a = option, *n = longname;
|
||||
if (longname == 0)
|
||||
return 0;
|
||||
for (; *a && *n && *a != '='; a++, n++)
|
||||
if (*a != *n)
|
||||
return 0;
|
||||
return *n == '\0' && (*a == '\0' || *a == '=');
|
||||
}
|
||||
|
||||
/* Return the part after "=", or NULL. */
|
||||
static char *
|
||||
optparse_longopts_arg(char *option)
|
||||
{
|
||||
for (; *option && *option != '='; option++);
|
||||
if (*option == '=')
|
||||
return option + 1;
|
||||
else
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int
|
||||
optparse_long_fallback(struct optparse *options,
|
||||
const struct optparse_long *longopts,
|
||||
int *longindex)
|
||||
{
|
||||
int result;
|
||||
char optstring[96 * 3 + 1]; /* 96 ASCII printable characters */
|
||||
optparse_from_long(longopts, optstring);
|
||||
result = optparse(options, optstring);
|
||||
if (longindex != 0) {
|
||||
*longindex = -1;
|
||||
if (result != -1) {
|
||||
int i;
|
||||
for (i = 0; !optparse_longopts_end(longopts, i); i++)
|
||||
if (longopts[i].shortname == options->optopt)
|
||||
*longindex = i;
|
||||
}
|
||||
}
|
||||
return result;
|
||||
}
|
||||
|
||||
OPTPARSE_API
|
||||
int
|
||||
optparse_long(struct optparse *options,
|
||||
const struct optparse_long *longopts,
|
||||
int *longindex)
|
||||
{
|
||||
int i;
|
||||
char *option = options->argv[options->optind];
|
||||
if (option == 0) {
|
||||
return -1;
|
||||
} else if (optparse_is_dashdash(option)) {
|
||||
options->optind++; /* consume "--" */
|
||||
return -1;
|
||||
} else if (optparse_is_shortopt(option)) {
|
||||
return optparse_long_fallback(options, longopts, longindex);
|
||||
} else if (!optparse_is_longopt(option)) {
|
||||
if (options->permute) {
|
||||
int index = options->optind++;
|
||||
int r = optparse_long(options, longopts, longindex);
|
||||
optparse_permute(options, index);
|
||||
options->optind--;
|
||||
return r;
|
||||
} else {
|
||||
return -1;
|
||||
}
|
||||
}
|
||||
|
||||
/* Parse as long option. */
|
||||
options->errmsg[0] = '\0';
|
||||
options->optopt = 0;
|
||||
options->optarg = 0;
|
||||
option += 2; /* skip "--" */
|
||||
options->optind++;
|
||||
for (i = 0; !optparse_longopts_end(longopts, i); i++) {
|
||||
const char *name = longopts[i].longname;
|
||||
if (optparse_longopts_match(name, option)) {
|
||||
char *arg;
|
||||
if (longindex)
|
||||
*longindex = i;
|
||||
options->optopt = longopts[i].shortname;
|
||||
arg = optparse_longopts_arg(option);
|
||||
if (longopts[i].argtype == OPTPARSE_NONE && arg != 0) {
|
||||
return optparse_error(options, OPTPARSE_MSG_TOOMANY, name);
|
||||
} if (arg != 0) {
|
||||
options->optarg = arg;
|
||||
} else if (longopts[i].argtype == OPTPARSE_REQUIRED) {
|
||||
options->optarg = options->argv[options->optind];
|
||||
if (options->optarg == 0)
|
||||
return optparse_error(options, OPTPARSE_MSG_MISSING, name);
|
||||
else
|
||||
options->optind++;
|
||||
}
|
||||
return options->optopt;
|
||||
}
|
||||
}
|
||||
return optparse_error(options, OPTPARSE_MSG_INVALID, option);
|
||||
}
|
||||
|
||||
#endif /* OPTPARSE_IMPLEMENTATION */
|
||||
#endif /* OPTPARSE_H */
|
||||
Loading…
Reference in New Issue