struct expression *
convert_args(struct stack *mimic_stack, unsigned long nr_args, struct vm_method *method)
{
struct expression *args_list = NULL;
unsigned long nr_total_args;
unsigned long i;
nr_total_args = nr_args;
if (vm_method_is_jni(method)) {
if (vm_method_is_static(method))
nr_total_args++;
nr_total_args++;
}
if (nr_total_args == 0) {
args_list = no_args_expr();
goto out;
}
/*
* We scan the args map in reverse order, since the order of arguments
* is already reversed.
*/
for (i = 0; i < nr_args; i++) {
struct expression *expr = stack_pop(mimic_stack);
if (vm_type_is_pair(expr->vm_type))
i++;
if (i >= nr_args)
break;
args_list = insert_arg(args_list, expr, method, nr_total_args - i - 1);
}
if (vm_method_is_jni(method)) {
struct expression *expr;
if (vm_method_is_static(method)) {
expr = value_expr(J_REFERENCE, (unsigned long) method->class->object);
if (!expr)
goto error;
args_list = insert_arg(args_list, expr, method, 1);
}
/*
* JNI methods also need a pointer to JNI environment. That's
* done in jni_trampoline automagically which is why we never
* use method index zero here for JNI methods.
*/
}
out:
return args_list;
error:
expr_put(args_list);
return NULL;
}
struct expression *convert_args(struct stack *mimic_stack,
unsigned long nr_args,
struct vm_method *method)
{
struct expression *args_list = NULL;
unsigned long i;
if (nr_args == 0) {
args_list = no_args_expr();
goto out;
}
/*
* We scan the args map in reverse order,
* since the order of arguments is already reversed.
*/
for (i = 0; i < nr_args; i++) {
struct expression *expr = stack_pop(mimic_stack);
args_list = insert_arg(args_list, expr,
method, nr_args - i - 1);
}
out:
return args_list;
}
void possible_command::insert_args(string s)
{
const char *p = s.contents();
const char *end = p + s.length();
int l = 0;
if (p >= end)
return;
// find the total number of arguments in our string
do {
l++;
p = strchr(p, '\0') + 1;
} while (p < end);
// now insert each argument preserving the order
for (int i = l - 1; i >= 0; i--) {
p = s.contents();
for (int j = 0; j < i; j++)
p = strchr(p, '\0') + 1;
insert_arg(p);
}
}
/* Read a single string from the output, escape characters and quotes, insert $ args */
int read_string(const char **pin, char **pout, int sargc, char **sargv)
{
int in_quote = 0;
const char *in = *pin;
char *out = *pout;
int len = 0;
int error = 0;
while(isspace(*in))
{
in++;
}
if(*in == 0)
{
*pin = in;
return 0;
}
while((*in != 0) && (error == 0))
{
/* Escape character */
if(*in == '\\')
{
if(in_quote == '\'')
{
*out++ = *in++;
if(*in)
{
*out++ = *in++;
}
}
else
{
/* Skip the escape */
in++;
switch(*in)
{
case 'n': *out++ = 10;
in++;
break;
case 'r': *out++ = 13;
in++;
break;
case '0': /* Octal */
{
int i;
unsigned char ch;
in++;
i = decode_oct(in, &ch);
if((i == 0) || (i == 1))
{
error = 1;
break;
}
in += i;
*out++ = ch;
}
break;
case 'x': /* Hexadecimal */
{
int i;
unsigned char ch;
in++;
i = decode_hex(in, &ch);
if((i == 0) || (i == 1))
{
error = 1;
break;
}
in += i;
*out++ = ch;
}
break;
case 0 : break; /* End of string */
default : *out++ = *in++;
break;
};
}
}
else
{
if((isspace(*in)) && (in_quote == 0))
{
while(isspace(*in))
{
in++;
}
break;
}
else if((*in == '>') && (in_quote == 0))
{
break;
}
else if((*in == '"') || (*in == '\''))
{
if(in_quote)
{
if(*in == in_quote)
{
in_quote = 0;
in++;
}
else
{
*out++ = *in++;
}
}
else
{
in_quote = *in;
in++;
}
}
else
{
if((*in == '$') && (in_quote != '\''))
{
in++;
insert_arg(&in, &out, sargc, sargv);
}
else
{
*out++ = *in++;
}
}
}
}
if(in_quote)
{
printf("Missing matching quote %c\n", in_quote);
}
else if(error)
{
printf("Error in command line\n");
}
else
{
*out++ = 0;
len = out - *pout;
}
*pin = in;
*pout = out;
return len;
}
/*===========================================================================*
* patch_stack *
*===========================================================================*/
static int patch_stack(
struct vnode *vp, /* pointer for open script file */
char stack[ARG_MAX], /* pointer to stack image within VFS */
vir_bytes *stk_bytes /* size of initial stack */
)
{
/* Patch the argument vector to include the path name of the script to be
* interpreted, and all strings on the #! line. Returns the path name of
* the interpreter.
*/
enum { INSERT=FALSE, REPLACE=TRUE };
int n, r;
off_t pos;
char *sp, *interp = NULL;
u64_t new_pos;
unsigned int cum_io;
char buf[_MAX_BLOCK_SIZE];
/* Make user_fullpath the new argv[0]. */
if (!insert_arg(stack, stk_bytes, user_fullpath, REPLACE)) {
printf("VFS: patch_stack: insert_arg for argv[0] failed\n");
return(ENOMEM);
}
pos = 0; /* Read from the start of the file */
/* Issue request */
r = req_readwrite(vp->v_fs_e, vp->v_inode_nr, cvul64(pos), READING,
VFS_PROC_NR, buf, _MAX_BLOCK_SIZE, &new_pos, &cum_io);
if (r != OK) return(r);
n = vp->v_size;
if (n > _MAX_BLOCK_SIZE)
n = _MAX_BLOCK_SIZE;
if (n < 2) return ENOEXEC;
sp = &(buf[2]); /* just behind the #! */
n -= 2;
if (n > PATH_MAX) n = PATH_MAX;
/* Use the user_fullpath variable for temporary storage */
memcpy(user_fullpath, sp, n);
if ((sp = memchr(user_fullpath, '\n', n)) == NULL) /* must be a proper line */
return(ENOEXEC);
/* Move sp backwards through script[], prepending each string to stack. */
for (;;) {
/* skip spaces behind argument. */
while (sp > user_fullpath && (*--sp == ' ' || *sp == '\t')) {}
if (sp == user_fullpath) break;
sp[1] = 0;
/* Move to the start of the argument. */
while (sp > user_fullpath && sp[-1] != ' ' && sp[-1] != '\t') --sp;
interp = sp;
if (!insert_arg(stack, stk_bytes, sp, INSERT)) {
printf("VFS: patch_stack: insert_arg failed\n");
return(ENOMEM);
}
}
if(!interp)
return ENOEXEC;
/* Round *stk_bytes up to the size of a pointer for alignment contraints. */
*stk_bytes= ((*stk_bytes + PTRSIZE - 1) / PTRSIZE) * PTRSIZE;
if (interp != user_fullpath)
memmove(user_fullpath, interp, strlen(interp)+1);
return(OK);
}
