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