// SPDX-License-Identifier: GPL-2.0#include <linux/compiler.h>#include <linux/string.h>#include <linux/types.h>#include <stdio.h>#include <stdlib.h>#include <stdint.h>#include <string.h>#include <ctype.h>#include "subcmd-util.h"#include "parse-options.h"#include "subcmd-config.h"#include "pager.h" #define OPT_SHORT 1#define OPT_UNSET 2 char *error_buf; static int opterror(const struct option *opt, const char *reason, int flags){	if (flags & OPT_SHORT)		fprintf(stderr, " Error: switch `%c' %s", opt->short_name, reason);	else if (flags & OPT_UNSET)		fprintf(stderr, " Error: option `no-%s' %s", opt->long_name, reason);	else		fprintf(stderr, " Error: option `%s' %s", opt->long_name, reason); 	return -1;} static const char *skip_prefix(const char *str, const char *prefix){	size_t len = strlen(prefix);	return strncmp(str, prefix, len) ? NULL : str + len;} static void optwarning(const struct option *opt, const char *reason, int flags){	if (flags & OPT_SHORT)		fprintf(stderr, " Warning: switch `%c' %s", opt->short_name, reason);	else if (flags & OPT_UNSET)		fprintf(stderr, " Warning: option `no-%s' %s", opt->long_name, reason);	else		fprintf(stderr, " Warning: option `%s' %s", opt->long_name, reason);} static int get_arg(struct parse_opt_ctx_t *p, const struct option *opt,		   int flags, const char **arg){	const char *res; 	if (p->opt) {		res = p->opt;		p->opt = NULL;	} else if ((opt->flags & PARSE_OPT_LASTARG_DEFAULT) && (p->argc == 1 ||		    **(p->argv + 1) == '-')) {		res = (const char *)opt->defval;	} else if (p->argc > 1) {		p->argc--;		res = *++p->argv;	} else		return opterror(opt, "requires a value", flags);	if (arg)		*arg = res;	return 0;} static int get_value(struct parse_opt_ctx_t *p,		     const struct option *opt, int flags){	const char *s, *arg = NULL;	const int unset = flags & OPT_UNSET;	int err; 	if (unset && p->opt)		return opterror(opt, "takes no value", flags);	if (unset && (opt->flags & PARSE_OPT_NONEG))		return opterror(opt, "isn't available", flags);	if (opt->flags & PARSE_OPT_DISABLED)		return opterror(opt, "is not usable", flags); 	if (opt->flags & PARSE_OPT_EXCLUSIVE) {		if (p->excl_opt && p->excl_opt != opt) {			char msg[128]; 			if (((flags & OPT_SHORT) && p->excl_opt->short_name) ||			    p->excl_opt->long_name == NULL) {				snprintf(msg, sizeof(msg), "cannot be used with switch `%c'",					 p->excl_opt->short_name);			} else {				snprintf(msg, sizeof(msg), "cannot be used with %s",					 p->excl_opt->long_name);			}			opterror(opt, msg, flags);			return -3;		}		p->excl_opt = opt;	}	if (!(flags & OPT_SHORT) && p->opt) {		switch (opt->type) {		case OPTION_CALLBACK:			if (!(opt->flags & PARSE_OPT_NOARG))				break;			/* FALLTHROUGH */		case OPTION_BOOLEAN:		case OPTION_INCR:		case OPTION_BIT:		case OPTION_SET_UINT:		case OPTION_SET_PTR:			return opterror(opt, "takes no value", flags);		case OPTION_END:		case OPTION_ARGUMENT:		case OPTION_GROUP:		case OPTION_STRING:		case OPTION_INTEGER:		case OPTION_UINTEGER:		case OPTION_LONG:		case OPTION_ULONG:		case OPTION_U64:		default:			break;		}	} 	if (opt->flags & PARSE_OPT_NOBUILD) {		char reason[128];		bool noarg = false; 		err = snprintf(reason, sizeof(reason),				opt->flags & PARSE_OPT_CANSKIP ?					"is being ignored because %s " :					"is not available because %s",				opt->build_opt);		reason[sizeof(reason) - 1] = '\0'; 		if (err < 0)			strncpy(reason, opt->flags & PARSE_OPT_CANSKIP ?					"is being ignored" :					"is not available",					sizeof(reason)); 		if (!(opt->flags & PARSE_OPT_CANSKIP))			return opterror(opt, reason, flags); 		err = 0;		if (unset)			noarg = true;		if (opt->flags & PARSE_OPT_NOARG)			noarg = true;		if (opt->flags & PARSE_OPT_OPTARG && !p->opt)			noarg = true; 		switch (opt->type) {		case OPTION_BOOLEAN:		case OPTION_INCR:		case OPTION_BIT:		case OPTION_SET_UINT:		case OPTION_SET_PTR:		case OPTION_END:		case OPTION_ARGUMENT:		case OPTION_GROUP:			noarg = true;			break;		case OPTION_CALLBACK:		case OPTION_STRING:		case OPTION_INTEGER:		case OPTION_UINTEGER:		case OPTION_LONG:		case OPTION_ULONG:		case OPTION_U64:		default:			break;		} 		if (!noarg)			err = get_arg(p, opt, flags, NULL);		if (err)			return err; 		optwarning(opt, reason, flags);		return 0;	} 	switch (opt->type) {	case OPTION_BIT:		if (unset)			*(int *)opt->value &= ~opt->defval;		else			*(int *)opt->value |= opt->defval;		return 0; 	case OPTION_BOOLEAN:		*(bool *)opt->value = unset ? false : true;		if (opt->set)			*(bool *)opt->set = true;		return 0; 	case OPTION_INCR:		*(int *)opt->value = unset ? 0 : *(int *)opt->value + 1;		return 0; 	case OPTION_SET_UINT:		*(unsigned int *)opt->value = unset ? 0 : opt->defval;		return 0; 	case OPTION_SET_PTR:		*(void **)opt->value = unset ? NULL : (void *)opt->defval;		return 0; 	case OPTION_STRING:		err = 0;		if (unset)			*(const char **)opt->value = NULL;		else if (opt->flags & PARSE_OPT_OPTARG && !p->opt)			*(const char **)opt->value = (const char *)opt->defval;		else			err = get_arg(p, opt, flags, (const char **)opt->value); 		if (opt->set)			*(bool *)opt->set = true; 		/* PARSE_OPT_NOEMPTY: Allow NULL but disallow empty string. */		if (opt->flags & PARSE_OPT_NOEMPTY) {			const char *val = *(const char **)opt->value; 			if (!val)				return err; 			/* Similar to unset if we are given an empty string. */			if (val[0] == '\0') {				*(const char **)opt->value = NULL;				return 0;			}		} 		return err; 	case OPTION_CALLBACK:		if (opt->set)			*(bool *)opt->set = true; 		if (unset)			return (*opt->callback)(opt, NULL, 1) ? (-1) : 0;		if (opt->flags & PARSE_OPT_NOARG)			return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;		if (opt->flags & PARSE_OPT_OPTARG && !p->opt)			return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;		if (get_arg(p, opt, flags, &arg))			return -1;		return (*opt->callback)(opt, arg, 0) ? (-1) : 0; 	case OPTION_INTEGER:		if (unset) {			*(int *)opt->value = 0;			return 0;		}		if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {			*(int *)opt->value = opt->defval;			return 0;		}		if (get_arg(p, opt, flags, &arg))			return -1;		*(int *)opt->value = strtol(arg, (char **)&s, 10);		if (*s)			return opterror(opt, "expects a numerical value", flags);		return 0; 	case OPTION_UINTEGER:		if (unset) {			*(unsigned int *)opt->value = 0;			return 0;		}		if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {			*(unsigned int *)opt->value = opt->defval;			return 0;		}		if (get_arg(p, opt, flags, &arg))			return -1;		if (arg[0] == '-')			return opterror(opt, "expects an unsigned numerical value", flags);		*(unsigned int *)opt->value = strtol(arg, (char **)&s, 10);		if (*s)			return opterror(opt, "expects a numerical value", flags);		return 0; 	case OPTION_LONG:		if (unset) {			*(long *)opt->value = 0;			return 0;		}		if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {			*(long *)opt->value = opt->defval;			return 0;		}		if (get_arg(p, opt, flags, &arg))			return -1;		*(long *)opt->value = strtol(arg, (char **)&s, 10);		if (*s)			return opterror(opt, "expects a numerical value", flags);		return 0; 	case OPTION_ULONG:		if (unset) {			*(unsigned long *)opt->value = 0;			return 0;		}		if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {			*(unsigned long *)opt->value = opt->defval;			return 0;		}		if (get_arg(p, opt, flags, &arg))			return -1;		*(unsigned long *)opt->value = strtoul(arg, (char **)&s, 10);		if (*s)			return opterror(opt, "expects a numerical value", flags);		return 0; 	case OPTION_U64:		if (unset) {			*(u64 *)opt->value = 0;			return 0;		}		if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {			*(u64 *)opt->value = opt->defval;			return 0;		}		if (get_arg(p, opt, flags, &arg))			return -1;		if (arg[0] == '-')			return opterror(opt, "expects an unsigned numerical value", flags);		*(u64 *)opt->value = strtoull(arg, (char **)&s, 10);		if (*s)			return opterror(opt, "expects a numerical value", flags);		return 0; 	case OPTION_END:	case OPTION_ARGUMENT:	case OPTION_GROUP:	default:		die("should not happen, someone must be hit on the forehead");	}} static int parse_short_opt(struct parse_opt_ctx_t *p, const struct option *options){retry:	for (; options->type != OPTION_END; options++) {		if (options->short_name == *p->opt) {			p->opt = p->opt[1] ? p->opt + 1 : NULL;			return get_value(p, options, OPT_SHORT);		}	} 	if (options->parent) {		options = options->parent;		goto retry;	} 	return -2;} static int parse_long_opt(struct parse_opt_ctx_t *p, const char *arg,                          const struct option *options){	const char *arg_end = strchr(arg, '=');	const struct option *abbrev_option = NULL, *ambiguous_option = NULL;	int abbrev_flags = 0, ambiguous_flags = 0; 	if (!arg_end)		arg_end = arg + strlen(arg); retry:	for (; options->type != OPTION_END; options++) {		const char *rest;		int flags = 0; 		if (!options->long_name)			continue; 		rest = skip_prefix(arg, options->long_name);		if (options->type == OPTION_ARGUMENT) {			if (!rest)				continue;			if (*rest == '=')				return opterror(options, "takes no value", flags);			if (*rest)				continue;			p->out[p->cpidx++] = arg - 2;			return 0;		}		if (!rest) {			if (strstarts(options->long_name, "no-")) {				/*				 * The long name itself starts with "no-", so				 * accept the option without "no-" so that users				 * do not have to enter "no-no-" to get the				 * negation.				 */				rest = skip_prefix(arg, options->long_name + 3);				if (rest) {					flags |= OPT_UNSET;					goto match;				}				/* Abbreviated case */				if (strstarts(options->long_name + 3, arg)) {					flags |= OPT_UNSET;					goto is_abbreviated;				}			}			/* abbreviated? */			if (!strncmp(options->long_name, arg, arg_end - arg)) {is_abbreviated:				if (abbrev_option) {					/*					 * If this is abbreviated, it is					 * ambiguous. So when there is no					 * exact match later, we need to					 * error out.					 */					ambiguous_option = abbrev_option;					ambiguous_flags = abbrev_flags;				}				if (!(flags & OPT_UNSET) && *arg_end)					p->opt = arg_end + 1;				abbrev_option = options;				abbrev_flags = flags;				continue;			}			/* negated and abbreviated very much? */			if (strstarts("no-", arg)) {				flags |= OPT_UNSET;				goto is_abbreviated;			}			/* negated? */			if (strncmp(arg, "no-", 3))				continue;			flags |= OPT_UNSET;			rest = skip_prefix(arg + 3, options->long_name);			/* abbreviated and negated? */			if (!rest && strstarts(options->long_name, arg + 3))				goto is_abbreviated;			if (!rest)				continue;		}match:		if (*rest) {			if (*rest != '=')				continue;			p->opt = rest + 1;		}		return get_value(p, options, flags);	} 	if (ambiguous_option) {		 fprintf(stderr,			 " Error: Ambiguous option: %s (could be --%s%s or --%s%s)\n",			 arg,			 (ambiguous_flags & OPT_UNSET) ?  "no-" : "",			 ambiguous_option->long_name,			 (abbrev_flags & OPT_UNSET) ?  "no-" : "",			 abbrev_option->long_name);		 return -1;	}	if (abbrev_option)		return get_value(p, abbrev_option, abbrev_flags); 	if (options->parent) {		options = options->parent;		goto retry;	} 	return -2;} static void check_typos(const char *arg, const struct option *options){	if (strlen(arg) < 3)		return; 	if (strstarts(arg, "no-")) {		fprintf(stderr, " Error: did you mean `--%s` (with two dashes ?)\n", arg);		exit(129);	} 	for (; options->type != OPTION_END; options++) {		if (!options->long_name)			continue;		if (strstarts(options->long_name, arg)) {			fprintf(stderr, " Error: did you mean `--%s` (with two dashes ?)\n", arg);			exit(129);		}	}} static void parse_options_start(struct parse_opt_ctx_t *ctx,				int argc, const char **argv, int flags){	memset(ctx, 0, sizeof(*ctx));	ctx->argc = argc - 1;

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