cmd-string.c - tmux - Rivoreo Source Code Repositories

 /* $Id: cmd-string.c,v 1.28 2009-11-28 14:45:30 tcunha Exp $ */

 /*
  * Copyright (c) 2008 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 <errno.h>
 #include <pwd.h>
 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>
 #include <unistd.h>

 #include "tmux.h"

 /*
  * Parse a command from a string.
  */

 int	cmd_string_getc(const char *, size_t *);
 void	cmd_string_ungetc(size_t *);
 char   *cmd_string_string(const char *, size_t *, char, int);
 char   *cmd_string_variable(const char *, size_t *);
 char   *cmd_string_expand_tilde(const char *, size_t *);

 int
 cmd_string_getc(const char *s, size_t *p)
 {
 	const u_char	*ucs = s;

 	if (ucs[*p] == '\0')
 		return (EOF);
 	return (ucs[(*p)++]);
 }

 void
 cmd_string_ungetc(size_t *p)
 {
 	(*p)--;
 }

 /*
  * Parse command string. Returns -1 on error. If returning -1, cause is error
  * string, or NULL for empty command.
  */
 int
 cmd_string_parse(const char *s, struct cmd_list **cmdlist, char **cause)
 {
 	size_t		p;
 	int		ch, i, argc, rval, have_arg;
 	char	      **argv, *buf, *t;
 	const char     *whitespace, *equals;
 	size_t		len;

 	argv = NULL;
 	argc = 0;

 	buf = NULL;
 	len = 0;

 	have_arg = 0;

 	*cause = NULL;

 	*cmdlist = NULL;
 	rval = -1;

 	p = 0;
 	for (;;) {
 		ch = cmd_string_getc(s, &p);
 		switch (ch) {
 		case '\'':
 			if ((t = cmd_string_string(s, &p, '\'', 0)) == NULL)
 				goto error;
 			buf = xrealloc(buf, 1, len + strlen(t) + 1);
 			strlcpy(buf + len, t, strlen(t) + 1);
 			len += strlen(t);
 			xfree(t);

 			have_arg = 1;
 			break;
 		case '"':
 			if ((t = cmd_string_string(s, &p, '"', 1)) == NULL)
 				goto error;
 			buf = xrealloc(buf, 1, len + strlen(t) + 1);
 			strlcpy(buf + len, t, strlen(t) + 1);
 			len += strlen(t);
 			xfree(t);

 			have_arg = 1;
 			break;
 		case '$':
 			if ((t = cmd_string_variable(s, &p)) == NULL)
 				goto error;
 			buf = xrealloc(buf, 1, len + strlen(t) + 1);
 			strlcpy(buf + len, t, strlen(t) + 1);
 			len += strlen(t);
 			xfree(t);

 			have_arg = 1;
 			break;
 		case '#':
 			/* Comment: discard rest of line. */
 			while ((ch = cmd_string_getc(s, &p)) != EOF)
 				;
 			/* FALLTHROUGH */
 		case EOF:
 		case ' ':
 		case '\t':
  			if (have_arg) {
 				buf = xrealloc(buf, 1, len + 1);
 				buf[len] = '\0';

 				argv = xrealloc(argv, argc + 1, sizeof *argv);
 				argv[argc++] = buf;

 				buf = NULL;
 				len = 0;

 				have_arg = 0;
 			}

 			if (ch != EOF)
 				break;

 			while (argc != 0) {
 				equals = strchr(argv[0], '=');
 				whitespace = argv[0] + strcspn(argv[0], " \t");
 				if (equals == NULL || equals > whitespace)
 					break;
 				environ_put(&global_environ, argv[0]);
 				argc--;
 				memmove(argv, argv + 1, argc * (sizeof *argv));
 			}
 			if (argc == 0)
 				goto out;

 			*cmdlist = cmd_list_parse(argc, argv, cause);
 			if (*cmdlist == NULL)
 				goto out;

 			rval = 0;
 			goto out;
 		case '~':
 			if (have_arg == 0) {
 				if ((t = cmd_string_expand_tilde(s, &p)) == NULL)
 					goto error;
 				buf = xrealloc(buf, 1, len + strlen(t) + 1);
 				strlcpy(buf + len, t, strlen(t) + 1);
 				len += strlen(t);
 				xfree(t);
 				break;
 			}
 			/* FALLTHROUGH */
 		default:
 			if (len >= SIZE_MAX - 2)
 				goto error;

 			buf = xrealloc(buf, 1, len + 1);
 			buf[len++] = ch;

 			have_arg = 1;
 			break;
 		}
 	}

 error:
 	xasprintf(cause, "invalid or unknown command: %s", s);

 out:
 	if (buf != NULL)
 		xfree(buf);

 	if (argv != NULL) {
 		for (i = 0; i < argc; i++)
 			xfree(argv[i]);
 		xfree(argv);
 	}

 	return (rval);
 }

 char *
 cmd_string_string(const char *s, size_t *p, char endch, int esc)
 {
 	int	ch;
 	char   *buf, *t;
 	size_t	len;

 	buf = NULL;
 	len = 0;

 	while ((ch = cmd_string_getc(s, p)) != endch) {
 		switch (ch) {
 		case EOF:
 			goto error;
 		case '\\':
 			if (!esc)
 				break;
 			switch (ch = cmd_string_getc(s, p)) {
 			case EOF:
 				goto error;
 			case 'e':
 				ch = '\033';
 				break;
 			case 'r':
 				ch = '\r';
 				break;
 			case 'n':
 				ch = '\n';
 				break;
 			case 't':
 				ch = '\t';
 				break;
 			}
 			break;
 		case '$':
 			if (!esc)
 				break;
 			if ((t = cmd_string_variable(s, p)) == NULL)
 				goto error;
 			buf = xrealloc(buf, 1, len + strlen(t) + 1);
 			strlcpy(buf + len, t, strlen(t) + 1);
 			len += strlen(t);
 			xfree(t);
 			continue;
 		}

 		if (len >= SIZE_MAX - 2)
 			goto error;
 		buf = xrealloc(buf, 1, len + 1);
 		buf[len++] = ch;
 	}

 	buf = xrealloc(buf, 1, len + 1);
 	buf[len] = '\0';
 	return (buf);

 error:
 	if (buf != NULL)
 		xfree(buf);
 	return (NULL);
 }

 char *
 cmd_string_variable(const char *s, size_t *p)
 {
 	int	ch, fch;
 	char   *buf, *t;
 	size_t	len;

 #define cmd_string_first(ch) ((ch) == '_' || \
 	((ch) >= 'a' && (ch) <= 'z') || ((ch) >= 'A' && (ch) <= 'Z'))
 #define cmd_string_other(ch) ((ch) == '_' || \
 	((ch) >= 'a' && (ch) <= 'z') || ((ch) >= 'A' && (ch) <= 'Z') || \
 	((ch) >= '0' && (ch) <= '9'))

 	buf = NULL;
 	len = 0;

 	fch = EOF;
 	switch (ch = cmd_string_getc(s, p)) {
 	case EOF:
 		goto error;
 	case '{':
 		fch = '{';

 		ch = cmd_string_getc(s, p);
 		if (!cmd_string_first(ch))
 			goto error;
 		/* FALLTHROUGH */
 	default:
 		if (!cmd_string_first(ch)) {
 			xasprintf(&t, "$%c", ch);
 			return (t);
 		}

 		buf = xrealloc(buf, 1, len + 1);
 		buf[len++] = ch;

 		for (;;) {
 			ch = cmd_string_getc(s, p);
 			if (ch == EOF || !cmd_string_other(ch))
 				break;
 			else {
 				if (len >= SIZE_MAX - 3)
 					goto error;
 				buf = xrealloc(buf, 1, len + 1);
 				buf[len++] = ch;
 			}
 		}
 	}

 	if (fch == '{' && ch != '}')
 		goto error;
 	if (ch != EOF && fch != '{')
 		cmd_string_ungetc(p); /* ch */

 	buf = xrealloc(buf, 1, len + 1);
 	buf[len] = '\0';

 	if ((t = getenv(buf)) == NULL) {
 		xfree(buf);
 		return (xstrdup(""));
 	}
 	xfree(buf);
 	return (xstrdup(t));

 error:
 	if (buf != NULL)
 		xfree(buf);
 	return (NULL);
 }

 char *
 cmd_string_expand_tilde(const char *s, size_t *p)
 {
 	struct passwd	*pw;
 	char		*home, *path, *username;

 	home = NULL;
 	if (cmd_string_getc(s, p) == '/') {
 		if ((home = getenv("HOME")) == NULL || *home == '\0') {
 			if ((pw = getpwuid(getuid())) != NULL)
 				home = pw->pw_dir;
 		}
 	} else {
 		cmd_string_ungetc(p);
 		if ((username = cmd_string_string(s, p, '/', 0)) == NULL)
 			return (NULL);
 		if ((pw = getpwnam(username)) != NULL)
 			home = pw->pw_dir;
 		if (username != NULL)
 			xfree(username);
 	}
 	if (home == NULL)
 		return (NULL);

 	xasprintf(&path, "%s/", home);
 	return (path);
 }
	/* $Id: cmd-string.c,v 1.28 2009-11-28 14:45:30 tcunha Exp $ */

	/*
	* Copyright (c) 2008 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 <errno.h>
	#include <pwd.h>
	#include <stdio.h>
	#include <string.h>
	#include <stdlib.h>
	#include <unistd.h>

	#include "tmux.h"

	/*
	* Parse a command from a string.
	*/

	int cmd_string_getc(const char , size_t );
	void cmd_string_ungetc(size_t *);
	char cmd_string_string(const char , size_t *, char, int);
	char cmd_string_variable(const char , size_t *);
	char cmd_string_expand_tilde(const char , size_t *);

	int
	cmd_string_getc(const char s, size_t p)
	{
	const u_char *ucs = s;

	if (ucs[*p] == '\0')
	return (EOF);
	return (ucs[(*p)++]);
	}

	void
	cmd_string_ungetc(size_t *p)
	{
	(*p)--;
	}

	/*
	* Parse command string. Returns -1 on error. If returning -1, cause is error
	* string, or NULL for empty command.
	*/
	int
	cmd_string_parse(const char s, struct cmd_list cmdlist, char *cause)
	{
	size_t p;
	int ch, i, argc, rval, have_arg;
	char *argv, buf, *t;
	const char whitespace, equals;
	size_t len;

	argv = NULL;
	argc = 0;

	buf = NULL;
	len = 0;

	have_arg = 0;

	*cause = NULL;

	*cmdlist = NULL;
	rval = -1;

	p = 0;
	for (;;) {
	ch = cmd_string_getc(s, &p);
	switch (ch) {
	case '\'':
	if ((t = cmd_string_string(s, &p, '\'', 0)) == NULL)
	goto error;
	buf = xrealloc(buf, 1, len + strlen(t) + 1);
	strlcpy(buf + len, t, strlen(t) + 1);
	len += strlen(t);
	xfree(t);

	have_arg = 1;
	break;
	case '"':
	if ((t = cmd_string_string(s, &p, '"', 1)) == NULL)
	goto error;
	buf = xrealloc(buf, 1, len + strlen(t) + 1);
	strlcpy(buf + len, t, strlen(t) + 1);
	len += strlen(t);
	xfree(t);

	have_arg = 1;
	break;
	case '$':
	if ((t = cmd_string_variable(s, &p)) == NULL)
	goto error;
	buf = xrealloc(buf, 1, len + strlen(t) + 1);
	strlcpy(buf + len, t, strlen(t) + 1);
	len += strlen(t);
	xfree(t);

	have_arg = 1;
	break;
	case '#':
	/* Comment: discard rest of line. */
	while ((ch = cmd_string_getc(s, &p)) != EOF)
	;
	/* FALLTHROUGH */
	case EOF:
	case ' ':
	case '\t':
	if (have_arg) {
	buf = xrealloc(buf, 1, len + 1);
	buf[len] = '\0';

	argv = xrealloc(argv, argc + 1, sizeof *argv);
	argv[argc++] = buf;

	buf = NULL;
	len = 0;

	have_arg = 0;
	}

	if (ch != EOF)
	break;

	while (argc != 0) {
	equals = strchr(argv[0], '=');
	whitespace = argv[0] + strcspn(argv[0], " \t");
	if (equals == NULL \|\| equals > whitespace)
	break;
	environ_put(&global_environ, argv[0]);
	argc--;
	memmove(argv, argv + 1, argc * (sizeof *argv));
	}
	if (argc == 0)
	goto out;

	*cmdlist = cmd_list_parse(argc, argv, cause);
	if (*cmdlist == NULL)
	goto out;

	rval = 0;
	goto out;
	case '~':
	if (have_arg == 0) {
	if ((t = cmd_string_expand_tilde(s, &p)) == NULL)
	goto error;
	buf = xrealloc(buf, 1, len + strlen(t) + 1);
	strlcpy(buf + len, t, strlen(t) + 1);
	len += strlen(t);
	xfree(t);
	break;
	}
	/* FALLTHROUGH */
	default:
	if (len >= SIZE_MAX - 2)
	goto error;

	buf = xrealloc(buf, 1, len + 1);
	buf[len++] = ch;

	have_arg = 1;
	break;
	}
	}

	error:
	xasprintf(cause, "invalid or unknown command: %s", s);

	out:
	if (buf != NULL)
	xfree(buf);

	if (argv != NULL) {
	for (i = 0; i < argc; i++)
	xfree(argv[i]);
	xfree(argv);
	}

	return (rval);
	}

	char *
	cmd_string_string(const char s, size_t p, char endch, int esc)
	{
	int ch;
	char buf, t;
	size_t len;

	buf = NULL;
	len = 0;

	while ((ch = cmd_string_getc(s, p)) != endch) {
	switch (ch) {
	case EOF:
	goto error;
	case '\\':
	if (!esc)
	break;
	switch (ch = cmd_string_getc(s, p)) {
	case EOF:
	goto error;
	case 'e':
	ch = '\033';
	break;
	case 'r':
	ch = '\r';
	break;
	case 'n':
	ch = '\n';
	break;
	case 't':
	ch = '\t';
	break;
	}
	break;
	case '$':
	if (!esc)
	break;
	if ((t = cmd_string_variable(s, p)) == NULL)
	goto error;
	buf = xrealloc(buf, 1, len + strlen(t) + 1);
	strlcpy(buf + len, t, strlen(t) + 1);
	len += strlen(t);
	xfree(t);
	continue;
	}

	if (len >= SIZE_MAX - 2)
	goto error;
	buf = xrealloc(buf, 1, len + 1);
	buf[len++] = ch;
	}

	buf = xrealloc(buf, 1, len + 1);
	buf[len] = '\0';
	return (buf);

	error:
	if (buf != NULL)
	xfree(buf);
	return (NULL);
	}

	char *
	cmd_string_variable(const char s, size_t p)
	{
	int ch, fch;
	char buf, t;
	size_t len;

	#define cmd_string_first(ch) ((ch) == '_' \|\| \
	((ch) >= 'a' && (ch) <= 'z') \|\| ((ch) >= 'A' && (ch) <= 'Z'))
	#define cmd_string_other(ch) ((ch) == '_' \|\| \
	((ch) >= 'a' && (ch) <= 'z') \|\| ((ch) >= 'A' && (ch) <= 'Z') \|\| \
	((ch) >= '0' && (ch) <= '9'))

	buf = NULL;
	len = 0;

	fch = EOF;
	switch (ch = cmd_string_getc(s, p)) {
	case EOF:
	goto error;
	case '{':
	fch = '{';

	ch = cmd_string_getc(s, p);
	if (!cmd_string_first(ch))
	goto error;
	/* FALLTHROUGH */
	default:
	if (!cmd_string_first(ch)) {
	xasprintf(&t, "$%c", ch);
	return (t);
	}

	buf = xrealloc(buf, 1, len + 1);
	buf[len++] = ch;

	for (;;) {
	ch = cmd_string_getc(s, p);
	if (ch == EOF \|\| !cmd_string_other(ch))
	break;
	else {
	if (len >= SIZE_MAX - 3)
	goto error;
	buf = xrealloc(buf, 1, len + 1);
	buf[len++] = ch;
	}
	}
	}

	if (fch == '{' && ch != '}')
	goto error;
	if (ch != EOF && fch != '{')
	cmd_string_ungetc(p); /* ch */

	buf = xrealloc(buf, 1, len + 1);
	buf[len] = '\0';

	if ((t = getenv(buf)) == NULL) {
	xfree(buf);
	return (xstrdup(""));
	}
	xfree(buf);
	return (xstrdup(t));

	error:
	if (buf != NULL)
	xfree(buf);
	return (NULL);
	}

	char *
	cmd_string_expand_tilde(const char s, size_t p)
	{
	struct passwd *pw;
	char home, path, *username;

	home = NULL;
	if (cmd_string_getc(s, p) == '/') {
	if ((home = getenv("HOME")) == NULL \|\| *home == '\0') {
	if ((pw = getpwuid(getuid())) != NULL)
	home = pw->pw_dir;
	}
	} else {
	cmd_string_ungetc(p);
	if ((username = cmd_string_string(s, p, '/', 0)) == NULL)
	return (NULL);
	if ((pw = getpwnam(username)) != NULL)
	home = pw->pw_dir;
	if (username != NULL)
	xfree(username);
	}
	if (home == NULL)
	return (NULL);

	xasprintf(&path, "%s/", home);
	return (path);
	}