arguments.c

/* $OpenBSD$ */

/*
 * Copyright (c) 2010 Nicholas Marriott <nicm@users.sourceforge.net>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/types.h>

#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "tmux.h"

/*
 * Manipulate command arguments.
 */

struct args_entry {
	u_char			 flag;
	char			*value;
	RB_ENTRY(args_entry)	 entry;
};

struct args_entry	*args_find(struct args *, u_char);

RB_GENERATE(args_tree, args_entry, entry, args_cmp);

/* Arguments tree comparison function. */
int
args_cmp(struct args_entry *a1, struct args_entry *a2)
{
	return (a1->flag - a2->flag);
}

/* Create an arguments set with no flags. */
struct args *
args_create(int argc, ...)
{
	struct args	*args;
	va_list		 ap;
	int		 i;

	args = xcalloc(1, sizeof *args);

	args->argc = argc;
	if (argc == 0)
		args->argv = NULL;
	else
		args->argv = xcalloc(argc, sizeof *args->argv);

	va_start(ap, argc);
	for (i = 0; i < argc; i++)
		args->argv[i] = xstrdup(va_arg(ap, char *));
	va_end(ap);

	return (args);
}

/* Find a flag in the arguments tree. */
struct args_entry *
args_find(struct args *args, u_char ch)
{
	struct args_entry	entry;

	entry.flag = ch;
	return (RB_FIND(args_tree, &args->tree, &entry));
}

/* Parse an argv and argc into a new argument set. */
struct args *
args_parse(const char *template, int argc, char **argv)
{
	struct args	*args;
	int		 opt;

	args = xcalloc(1, sizeof *args);

	optreset = 1;
	optind = 1;

	while ((opt = getopt(argc, argv, template)) != -1) {
		if (opt < 0)
			continue;
		if (opt == '?' || strchr(template, opt) == NULL) {
			args_free(args);
			return (NULL);
		}
		args_set(args, opt, optarg);
	}
	argc -= optind;
	argv += optind;

	args->argc = argc;
	args->argv = cmd_copy_argv(argc, argv);

	return (args);
}

/* Free an arguments set. */
void
args_free(struct args *args)
{
	struct args_entry	*entry;
	struct args_entry	*entry1;

	cmd_free_argv(args->argc, args->argv);

	RB_FOREACH_SAFE(entry, args_tree, &args->tree, entry1) {
		RB_REMOVE(args_tree, &args->tree, entry);
		free(entry->value);
		free(entry);
	}

	free(args);
}

/* Print a set of arguments. */
size_t
args_print(struct args *args, char *buf, size_t len)
{
	size_t		 	 off, used;
	int			 i;
	const char		*quotes;
	struct args_entry	*entry;

	/* There must be at least one byte at the start. */
	if (len == 0)
		return (0);
	off = 0;

	/* Process the flags first. */
	buf[off++] = '-';
	RB_FOREACH(entry, args_tree, &args->tree) {
		if (entry->value != NULL)
			continue;

		if (off == len - 1) {
			buf[off] = '\0';
			return (len);
		}
		buf[off++] = entry->flag;
		buf[off] = '\0';
	}
	if (off == 1)
		buf[--off] = '\0';

	/* Then the flags with arguments. */
	RB_FOREACH(entry, args_tree, &args->tree) {
		if (entry->value == NULL)
			continue;

		if (off >= len) {
			/* snprintf will have zero terminated. */
			return (len);
		}

		if (strchr(entry->value, ' ') != NULL)
			quotes = "\"";
		else
			quotes = "";
		used = xsnprintf(buf + off, len - off, "%s-%c %s%s%s",
		    off != 0 ? " " : "", entry->flag, quotes, entry->value,
		    quotes);
		if (used > len - off)
			used = len - off;
		off += used;
	}

	/* And finally the argument vector. */
	for (i = 0; i < args->argc; i++) {
		if (off >= len) {
			/* snprintf will have zero terminated. */
			return (len);
		}

		if (strchr(args->argv[i], ' ') != NULL)
			quotes = "\"";
		else
			quotes = "";
		used = xsnprintf(buf + off, len - off, "%s%s%s%s",
		    off != 0 ? " " : "", quotes, args->argv[i], quotes);
		if (used > len - off)
			used = len - off;
		off += used;
	}

	return (off);
}

/* Return if an argument is present. */
int
args_has(struct args *args, u_char ch)
{
	return (args_find(args, ch) == NULL ? 0 : 1);
}

/* Set argument value in the arguments tree. */
void
args_set(struct args *args, u_char ch, const char *value)
{
	struct args_entry	*entry;

	/* Replace existing argument. */
	if ((entry = args_find(args, ch)) != NULL) {
		free(entry->value);
		entry->value = NULL;
	} else {
		entry = xcalloc(1, sizeof *entry);
		entry->flag = ch;
		RB_INSERT(args_tree, &args->tree, entry);
	}

	if (value != NULL)
		entry->value = xstrdup(value);
}

/* Get argument value. Will be NULL if it isn't present. */
const char *
args_get(struct args *args, u_char ch)
{
	struct args_entry	*entry;

	if ((entry = args_find(args, ch)) == NULL)
		return (NULL);
	return (entry->value);
}

/* Convert an argument value to a number. */
long long
args_strtonum(struct args *args, u_char ch, long long minval, long long maxval,
    char **cause)
{
	const char		*errstr;
	long long 	 	 ll;
	struct args_entry	*entry;

	if ((entry = args_find(args, ch)) == NULL) {
		*cause = xstrdup("missing");
		return (0);
	}

	ll = strtonum(entry->value, minval, maxval, &errstr);
	if (errstr != NULL) {
		*cause = xstrdup(errstr);
		return (0);
	}

	*cause = NULL;
	return (ll);
}