320 lines
6.3 KiB
C
320 lines
6.3 KiB
C
/* String object implementation */
|
|
|
|
#include <stdio.h>
|
|
|
|
#include "PROTO.h"
|
|
#include "object.h"
|
|
#include "stringobject.h"
|
|
#include "intobject.h"
|
|
#include "objimpl.h"
|
|
#include "errors.h"
|
|
|
|
object *
|
|
newsizedstringobject(str, size)
|
|
char *str;
|
|
int size;
|
|
{
|
|
register stringobject *op = (stringobject *)
|
|
malloc(sizeof(stringobject) + size * sizeof(char));
|
|
if (op == NULL)
|
|
return err_nomem();
|
|
NEWREF(op);
|
|
op->ob_type = &Stringtype;
|
|
op->ob_size = size;
|
|
if (str != NULL)
|
|
memcpy(op->ob_sval, str, size);
|
|
op->ob_sval[size] = '\0';
|
|
return (object *) op;
|
|
}
|
|
|
|
object *
|
|
newstringobject(str)
|
|
char *str;
|
|
{
|
|
register unsigned int size = strlen(str);
|
|
register stringobject *op = (stringobject *)
|
|
malloc(sizeof(stringobject) + size * sizeof(char));
|
|
if (op == NULL)
|
|
return err_nomem();
|
|
NEWREF(op);
|
|
op->ob_type = &Stringtype;
|
|
op->ob_size = size;
|
|
strcpy(op->ob_sval, str);
|
|
return (object *) op;
|
|
}
|
|
|
|
unsigned int
|
|
getstringsize(op)
|
|
register object *op;
|
|
{
|
|
if (!is_stringobject(op)) {
|
|
err_badcall();
|
|
return -1;
|
|
}
|
|
return ((stringobject *)op) -> ob_size;
|
|
}
|
|
|
|
/*const*/ char *
|
|
getstringvalue(op)
|
|
register object *op;
|
|
{
|
|
if (!is_stringobject(op)) {
|
|
err_badcall();
|
|
return NULL;
|
|
}
|
|
return ((stringobject *)op) -> ob_sval;
|
|
}
|
|
|
|
/* Methods */
|
|
|
|
static void
|
|
stringprint(op, fp, flags)
|
|
stringobject *op;
|
|
FILE *fp;
|
|
int flags;
|
|
{
|
|
int i;
|
|
char c;
|
|
if (flags & PRINT_RAW) {
|
|
fwrite(op->ob_sval, 1, (int) op->ob_size, fp);
|
|
return;
|
|
}
|
|
fprintf(fp, "'");
|
|
for (i = 0; i < op->ob_size; i++) {
|
|
c = op->ob_sval[i];
|
|
if (c == '\'' || c == '\\')
|
|
fprintf(fp, "\\%c", c);
|
|
else if (c < ' ' || c >= 0177)
|
|
fprintf(fp, "\\%03o", c&0377);
|
|
else
|
|
putc(c, fp);
|
|
}
|
|
fprintf(fp, "'");
|
|
}
|
|
|
|
static object *
|
|
stringrepr(op)
|
|
register stringobject *op;
|
|
{
|
|
/* XXX overflow? */
|
|
int newsize = 2 + 4 * op->ob_size * sizeof(char);
|
|
object *v = newsizedstringobject((char *)NULL, newsize);
|
|
if (v == NULL) {
|
|
return err_nomem();
|
|
}
|
|
else {
|
|
register int i;
|
|
register char c;
|
|
register char *p;
|
|
NEWREF(v);
|
|
v->ob_type = &Stringtype;
|
|
((stringobject *)v)->ob_size = newsize;
|
|
p = ((stringobject *)v)->ob_sval;
|
|
*p++ = '\'';
|
|
for (i = 0; i < op->ob_size; i++) {
|
|
c = op->ob_sval[i];
|
|
if (c == '\'' || c == '\\')
|
|
*p++ = '\\', *p++ = c;
|
|
else if (c < ' ' || c >= 0177) {
|
|
sprintf(p, "\\%03o", c&0377);
|
|
while (*p != '\0')
|
|
p++;
|
|
|
|
}
|
|
else
|
|
*p++ = c;
|
|
}
|
|
*p++ = '\'';
|
|
*p = '\0';
|
|
resizestring(&v, (int) (p - ((stringobject *)v)->ob_sval));
|
|
return v;
|
|
}
|
|
}
|
|
|
|
static int
|
|
stringlength(a)
|
|
stringobject *a;
|
|
{
|
|
return a->ob_size;
|
|
}
|
|
|
|
static object *
|
|
stringconcat(a, bb)
|
|
register stringobject *a;
|
|
register object *bb;
|
|
{
|
|
register unsigned int size;
|
|
register stringobject *op;
|
|
if (!is_stringobject(bb)) {
|
|
err_badarg();
|
|
return NULL;
|
|
}
|
|
#define b ((stringobject *)bb)
|
|
/* Optimize cases with empty left or right operand */
|
|
if (a->ob_size == 0) {
|
|
INCREF(bb);
|
|
return bb;
|
|
}
|
|
if (b->ob_size == 0) {
|
|
INCREF(a);
|
|
return (object *)a;
|
|
}
|
|
size = a->ob_size + b->ob_size;
|
|
op = (stringobject *)
|
|
malloc(sizeof(stringobject) + size * sizeof(char));
|
|
if (op == NULL)
|
|
return err_nomem();
|
|
NEWREF(op);
|
|
op->ob_type = &Stringtype;
|
|
op->ob_size = size;
|
|
memcpy(op->ob_sval, a->ob_sval, (int) a->ob_size);
|
|
memcpy(op->ob_sval + a->ob_size, b->ob_sval, (int) b->ob_size);
|
|
op->ob_sval[size] = '\0';
|
|
return (object *) op;
|
|
#undef b
|
|
}
|
|
|
|
static object *
|
|
stringrepeat(a, n)
|
|
register stringobject *a;
|
|
register int n;
|
|
{
|
|
register int i;
|
|
register unsigned int size;
|
|
register stringobject *op;
|
|
if (n < 0)
|
|
n = 0;
|
|
size = a->ob_size * n;
|
|
if (size == a->ob_size) {
|
|
INCREF(a);
|
|
return (object *)a;
|
|
}
|
|
op = (stringobject *)
|
|
malloc(sizeof(stringobject) + size * sizeof(char));
|
|
if (op == NULL)
|
|
return err_nomem();
|
|
NEWREF(op);
|
|
op->ob_type = &Stringtype;
|
|
op->ob_size = size;
|
|
for (i = 0; i < size; i += a->ob_size)
|
|
memcpy(op->ob_sval+i, a->ob_sval, (int) a->ob_size);
|
|
op->ob_sval[size] = '\0';
|
|
return (object *) op;
|
|
}
|
|
|
|
/* String slice a[i:j] consists of characters a[i] ... a[j-1] */
|
|
|
|
static object *
|
|
stringslice(a, i, j)
|
|
register stringobject *a;
|
|
register int i, j; /* May be negative! */
|
|
{
|
|
if (i < 0)
|
|
i = 0;
|
|
if (j < 0)
|
|
j = 0; /* Avoid signed/unsigned bug in next line */
|
|
if (j > a->ob_size)
|
|
j = a->ob_size;
|
|
if (i == 0 && j == a->ob_size) { /* It's the same as a */
|
|
INCREF(a);
|
|
return (object *)a;
|
|
}
|
|
if (j < i)
|
|
j = i;
|
|
return newsizedstringobject(a->ob_sval + i, (int) (j-i));
|
|
}
|
|
|
|
static object *
|
|
stringitem(a, i)
|
|
stringobject *a;
|
|
register int i;
|
|
{
|
|
if (i < 0 || i >= a->ob_size) {
|
|
err_setstr(IndexError, "string index out of range");
|
|
return NULL;
|
|
}
|
|
return stringslice(a, i, i+1);
|
|
}
|
|
|
|
static int
|
|
stringcompare(a, b)
|
|
stringobject *a, *b;
|
|
{
|
|
/* XXX should use memcmp on shortest size, then compare lengths */
|
|
return strcmp(a->ob_sval, b->ob_sval);
|
|
}
|
|
|
|
static sequence_methods string_as_sequence = {
|
|
stringlength, /*tp_length*/
|
|
stringconcat, /*tp_concat*/
|
|
stringrepeat, /*tp_repeat*/
|
|
stringitem, /*tp_item*/
|
|
stringslice, /*tp_slice*/
|
|
0, /*tp_ass_item*/
|
|
0, /*tp_ass_slice*/
|
|
};
|
|
|
|
typeobject Stringtype = {
|
|
OB_HEAD_INIT(&Typetype)
|
|
0,
|
|
"string",
|
|
sizeof(stringobject),
|
|
sizeof(char),
|
|
free, /*tp_dealloc*/
|
|
stringprint, /*tp_print*/
|
|
0, /*tp_getattr*/
|
|
0, /*tp_setattr*/
|
|
stringcompare, /*tp_compare*/
|
|
stringrepr, /*tp_repr*/
|
|
0, /*tp_as_number*/
|
|
&string_as_sequence, /*tp_as_sequence*/
|
|
0, /*tp_as_mapping*/
|
|
};
|
|
|
|
void
|
|
joinstring(pv, w)
|
|
register object **pv;
|
|
register object *w;
|
|
{
|
|
register object *v;
|
|
if (*pv == NULL || w == NULL || !is_stringobject(*pv))
|
|
return;
|
|
v = stringconcat((stringobject *) *pv, w);
|
|
DECREF(*pv);
|
|
*pv = v;
|
|
}
|
|
|
|
/* The following function breaks the notion that strings are immutable:
|
|
it changes the size of a string. We get away with this only if there
|
|
is only one module referencing the object. You can also think of it
|
|
as creating a new string object and destroying the old one, only
|
|
more efficiently. In any case, don't use this if the string may
|
|
already be known to some other part of the code... */
|
|
|
|
int
|
|
resizestring(pv, newsize)
|
|
object **pv;
|
|
int newsize;
|
|
{
|
|
register stringobject *v;
|
|
v = (stringobject *) *pv;
|
|
if (!is_stringobject(v) || v->ob_refcnt != 1) {
|
|
*pv = 0;
|
|
DECREF(v);
|
|
err_badcall();
|
|
return -1;
|
|
}
|
|
*pv = (object *)
|
|
realloc((char *)v,
|
|
sizeof(stringobject) + newsize * sizeof(char));
|
|
if (*pv == NULL) {
|
|
DECREF(v);
|
|
err_nomem();
|
|
return -1;
|
|
}
|
|
v = (stringobject *) *pv;
|
|
v->ob_size = newsize;
|
|
v->ob_sval[newsize] = '\0';
|
|
return 0;
|
|
}
|