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|
/* cmd line facility for slang */
/* Copyright (c) 1992, 1999, 2001 John E. Davis
* This file is part of the S-Lang library.
*
* You may distribute under the terms of either the GNU General Public
* License or the Perl Artistic License.
*/
#include "slinclud.h"
#if SLANG_HAS_FLOAT
# include <math.h>
#endif
#include "slang.h"
#include "_slang.h"
#ifndef HAVE_STDLIB_H
/* Oh dear. Where is the prototype for atof? If not in stdlib, then
* I do not know where. Not in math.h onsome systems either.
*/
extern double atof ();
#endif
static SLcmd_Cmd_Type *SLcmd_find_command (char *s, SLcmd_Cmd_Type *cmd)
{
char *cmdstr;
char chs = *s++, ch;
while ((cmd->cmdfun != NULL)
&& (NULL != (cmdstr = cmd->cmd))
&& (0 != (ch = *cmdstr++)))
{
if ((ch == chs) && !strcmp (s, cmdstr)) return cmd;
cmd++;
}
return NULL;
}
static int extract_token (char **strptr, char *buf)
{
char *s, *b;
char ch, quote;
*buf = 0;
s = *strptr;
while (((ch = *s) != 0)
&& ((ch == ' ') || (ch == '\t') || (ch == '\n')))
s++;
*strptr = s;
if (ch == 0) return 0;
if (ch == '%') return 0;
b = buf;
*b++ = ch;
s++;
if ((ch == '\'') || (ch == '"'))
{
quote = ch;
while ((ch = *s) != 0)
{
s++;
*b++ = ch;
if (ch == quote)
break;
if (ch == '\\')
{
if (0 == (ch = *s))
break;
*b++ = ch;
s++;
}
}
*strptr = s;
*b = 0;
return 1;
}
while (((ch = *s) != 0)
&& (ch != ' ')
&& (ch != '\t')
&& (ch != '\n')
&& (ch != '%'))
*b++ = *s++;
*strptr = s;
*b = 0;
return 1;
}
static int allocate_arg_space (SLcmd_Cmd_Table_Type *table, int argc, unsigned int *space_ptr)
{
unsigned int space = *space_ptr;
char *p;
if (argc + 1 < (int) space)
return 0;
if (space > 128)
{
if (space > 1024) space += 1024;
else space += 128;
}
else space += 32;
if (NULL == (p = SLrealloc ((char *)table->string_args, space * sizeof (char *))))
return -1;
table->string_args = (char **)p;
table->string_args [argc] = NULL;
if (NULL == (p = SLrealloc ((char *)table->int_args, space * sizeof (int))))
return -1;
table->int_args = (int *)p;
if (NULL == (p = SLrealloc ((char *)table->double_args, space * sizeof (double))))
return -1;
table->double_args = (double *)p;
if (NULL == (p = SLrealloc ((char *)table->arg_type, space * sizeof (unsigned char))))
return -1;
table->arg_type = (unsigned char *)p;
*space_ptr = space;
return 0;
}
int SLcmd_execute_string (char *str, SLcmd_Cmd_Table_Type *table)
{
char *s, *b = NULL, *arg_type, *last_str, *cmd_name;
SLcmd_Cmd_Type *cmd;
char *buf;
int token_present;
int i;
int status;
unsigned int len;
int argc;
unsigned int space;
table->argc = 0;
table->string_args = NULL;
table->int_args = NULL;
table->double_args = NULL;
table->arg_type = NULL;
buf = SLmake_string (str);
if (buf == NULL)
return -1;
status = extract_token (&str, buf);
if (status <= 0)
{
SLfree (buf);
return status;
}
if (((len = strlen (buf)) >= 32)
|| (NULL == (cmd = SLcmd_find_command (buf, table->table))))
{
SLang_verror (SL_UNDEFINED_NAME,"%s: invalid command", buf);
SLfree (buf);
return -1;
}
if (NULL == (cmd_name = SLmake_string (buf)))
{
SLfree (buf);
return -1;
}
space = 0;
argc = 0;
if (-1 == allocate_arg_space (table, argc, &space))
{
SLfree (buf);
return -1;
}
table->arg_type[argc] = SLANG_STRING_TYPE;
table->string_args[argc++] = cmd_name;
arg_type = cmd->arg_type;
status = -1;
while (*arg_type)
{
int guess_type = 0;
last_str = str;
if (-1 == allocate_arg_space (table, argc, &space))
goto error;
if (-1 == (token_present = extract_token (&str, buf)))
goto error;
table->string_args[argc] = NULL;
if (token_present)
{
b = buf;
len = strlen (b);
if ((*b == '"') && (len > 1))
{
b++;
len -= 2;
b[len] = 0;
guess_type = SLANG_STRING_TYPE;
SLexpand_escaped_string (buf, b, b + len);
len = strlen (buf);
}
else if ((*b == '\'') && (len > 1))
{
char ch;
b++;
len -= 2;
b[len] = 0;
guess_type = SLANG_INT_TYPE;
ch = *b;
if (ch == '\\')
(void) _SLexpand_escaped_char (b, &ch);
sprintf (buf, "%d", (unsigned char) ch);
len = strlen (buf);
}
else guess_type = SLang_guess_type (buf);
}
switch (*arg_type++)
{
/* variable argument number */
case 'v':
if (token_present == 0) break;
case 'V':
if (token_present == 0)
{
SLang_verror (SL_INVALID_PARM, "%s: Expecting argument", cmd_name);
goto error;
}
while (*last_str == ' ') last_str++;
len = strlen (last_str);
str = last_str + len;
s = SLmake_nstring (last_str, len);
if (s == NULL) goto error;
table->arg_type[argc] = SLANG_STRING_TYPE;
table->string_args[argc++] = s;
break;
case 's':
if (token_present == 0) break;
case 'S':
if (token_present == 0)
{
SLang_verror (SL_TYPE_MISMATCH, "%s: Expecting string argument", cmd_name);
goto error;
}
s = SLmake_nstring (buf, len);
if (s == NULL) goto error;
table->arg_type[argc] = SLANG_STRING_TYPE;
table->string_args[argc++] = s;
break;
/* integer argument */
case 'i':
if (token_present == 0) break;
case 'I':
if ((token_present == 0) || (SLANG_INT_TYPE != guess_type))
{
SLang_verror (SL_TYPE_MISMATCH, "%s: Expecting integer argument", cmd_name);
goto error;
}
table->arg_type[argc] = SLANG_INT_TYPE;
table->int_args[argc++] = SLatoi((unsigned char *) buf);
break;
/* floating point arg */
#if SLANG_HAS_FLOAT
case 'f':
if (token_present == 0) break;
case 'F':
if ((token_present == 0) || (SLANG_STRING_TYPE == guess_type))
{
SLang_verror (SL_TYPE_MISMATCH, "%s: Expecting double argument", cmd_name);
goto error;
}
table->arg_type[argc] = SLANG_DOUBLE_TYPE;
table->double_args[argc++] = atof(buf);
break;
#endif
/* Generic type */
case 'g':
if (token_present == 0) break;
case 'G':
if (token_present == 0)
{
SLang_verror (SL_TYPE_MISMATCH, "%s: Expecting argument", cmd_name);
goto error;
}
switch (guess_type)
{
case SLANG_INT_TYPE:
table->arg_type[argc] = SLANG_INT_TYPE;
table->int_args[argc++] = SLatoi((unsigned char *) buf);
break;
case SLANG_STRING_TYPE:
s = SLmake_nstring (buf, len);
if (s == NULL) goto error;
table->arg_type[argc] = SLANG_STRING_TYPE;
table->string_args[argc++] = s;
break;
#if SLANG_HAS_FLOAT
case SLANG_DOUBLE_TYPE:
table->arg_type[argc] = SLANG_DOUBLE_TYPE;
table->double_args[argc++] = atof(buf);
#endif
}
break;
}
}
/* call function */
status = (*cmd->cmdfun)(argc, table);
error:
if (table->string_args != NULL) for (i = 0; i < argc; i++)
{
if (NULL != table->string_args[i])
{
SLfree (table->string_args[i]);
table->string_args[i] = NULL;
}
}
SLfree ((char *)table->string_args); table->string_args = NULL;
SLfree ((char *)table->double_args); table->double_args = NULL;
SLfree ((char *)table->int_args); table->int_args = NULL;
SLfree ((char *)table->arg_type); table->arg_type = NULL;
SLfree (buf);
return status;
}
|
