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/* $Id: cmd-string.c,v 1.1 2008-06-19 20:45:20 nicm 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 <stdio.h>
#include <string.h>
#include "tmux.h"
/*
* Parse a command from a string.
*/
int cmd_string_getc(const char *, size_t *);
char *cmd_string_string(const char *, size_t *, char, int);
int
cmd_string_getc(const char *s, size_t *p)
{
if (s[*p] == '\0')
return (EOF);
return (s[(*p)++]);
}
struct cmd *
cmd_string_parse(const char *s, char **cause)
{
size_t p;
int ch, argc;
char **argv, *buf, *t;
size_t len;
struct cmd *cmd;
argv = NULL;
argc = 0;
buf = NULL;
len = 0;
cmd = NULL;
p = 0;
for (;;) {
ch = cmd_string_getc(s, &p);
switch (ch) {
case '\'':
if ((t = cmd_string_string(s, &p, '\'', 0)) == NULL)
goto error;
argv = xrealloc(argv, argc + 1, sizeof *argv);
argv[argc++] = t;
break;
case '"':
if ((t = cmd_string_string(s, &p, '"', 1)) == NULL)
goto error;
argv = xrealloc(argv, argc + 1, sizeof *argv);
argv[argc++] = t;
break;
case '#':
/* Comment: discard rest of line. */
while ((ch = cmd_string_getc(s, &p)) != EOF)
;
/* FALLTHROUGH */
case EOF:
case ' ':
case '\t':
if (len != 0) {
buf = xrealloc(buf, 1, len + 1);
buf[len] = '\0';
argv = xrealloc(argv, argc + 1, sizeof *argv);
argv[argc++] = buf;
buf = NULL;
len = 0;
}
if (ch != EOF)
break;
cmd = cmd_parse(argc, argv, cause);
goto out;
default:
if (len >= SIZE_MAX - 2)
goto error;
buf = xrealloc(buf, 1, len + 1);
buf[len++] = ch;
break;
}
}
error:
xasprintf(cause, "bad command: %s", s);
out:
if (buf != NULL)
xfree(buf);
while (--argc >= 0)
xfree(argv[argc]);
if (argv != NULL)
xfree(argv);
return (cmd);
}
char *
cmd_string_string(const char *s, size_t *p, char endch, int esc)
{
int ch;
char *buf;
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 'r':
ch = '\r';
break;
case 'n':
ch = '\n';
break;
case 't':
ch = '\t';
break;
}
break;
}
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);
}
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