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371 lines
8.1 KiB
C
371 lines
8.1 KiB
C
/***********************************************************
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Copyright 1991 by Stichting Mathematisch Centrum, Amsterdam, The
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Netherlands.
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and its
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documentation for any purpose and without fee is hereby granted,
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provided that the above copyright notice appear in all copies and that
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both that copyright notice and this permission notice appear in
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supporting documentation, and that the names of Stichting Mathematisch
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Centrum or CWI not be used in advertising or publicity pertaining to
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distribution of the software without specific, written prior permission.
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STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
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THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
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FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
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FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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******************************************************************/
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/* String object implementation */
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#include "allobjects.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 int
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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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/* XXX Ought to check for interrupts when writing long strings */
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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 0;
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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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return 0;
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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 NULL;
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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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#ifdef __STDC__
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#include <limits.h>
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#else
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#ifndef UCHAR_MAX
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#define UCHAR_MAX 255
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#endif
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#endif
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static object *characters[UCHAR_MAX + 1];
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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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int c;
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object *v;
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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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c = a->ob_sval[i] & UCHAR_MAX;
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v = characters[c];
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if (v == NULL) {
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v = newsizedstringobject((char *)NULL, 1);
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if (v == NULL)
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return NULL;
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characters[c] = v;
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((stringobject *)v)->ob_sval[0] = c;
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}
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INCREF(v);
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return v;
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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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int len_a = a->ob_size, len_b = b->ob_size;
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int min_len = (len_a < len_b) ? len_a : len_b;
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int cmp = memcmp(a->ob_sval, b->ob_sval, min_len);
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if (cmp != 0)
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return cmp;
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return (len_a < len_b) ? -1 : (len_a > len_b) ? 1 : 0;
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}
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static sequence_methods string_as_sequence = {
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stringlength, /*sq_length*/
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stringconcat, /*sq_concat*/
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stringrepeat, /*sq_repeat*/
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stringitem, /*sq_item*/
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stringslice, /*sq_slice*/
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0, /*sq_ass_item*/
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0, /*sq_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 object *v;
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register stringobject *sv;
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v = *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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/* XXX UNREF/NEWREF interface should be more symmetrical */
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#ifdef REF_DEBUG
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--ref_total;
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#endif
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UNREF(v);
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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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DEL(v);
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err_nomem();
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return -1;
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}
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NEWREF(*pv);
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sv = (stringobject *) *pv;
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sv->ob_size = newsize;
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sv->ob_sval[newsize] = '\0';
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return 0;
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}
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