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Copy pathstring.c
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2302 lines (1985 loc) · 41.7 KB
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/************************************************
string.c -
$Author$
$Date$
created at: Mon Aug 9 17:12:58 JST 1993
Copyright (C) 1993-1996 Yukihiro Matsumoto
************************************************/
#include "ruby.h"
#include "re.h"
#define BEG(no) regs->beg[no]
#define END(no) regs->end[no]
#include <stdio.h>
#include <ctype.h>
VALUE cString;
#define STRLEN(s) RSTRING(s)->len
#define STR_FREEZE FL_USER1
#define STR_TAINT FL_USER2
VALUE str_taint();
VALUE str_tainted();
VALUE
str_new(ptr, len)
UCHAR *ptr;
UINT len;
{
NEWOBJ(str, struct RString);
OBJSETUP(str, cString, T_STRING);
if (rb_safe_level() >= 3) {
FL_SET(str, STR_TAINT);
}
str->len = len;
str->orig = 0;
str->ptr = ALLOC_N(char,len+1);
if (ptr) {
memcpy(str->ptr, ptr, len);
}
str->ptr[len] = '\0';
return (VALUE)str;
}
VALUE
str_new2(ptr)
UCHAR *ptr;
{
return str_new(ptr, strlen(ptr));
}
VALUE
str_new3(str)
struct RString *str;
{
NEWOBJ(str2, struct RString);
OBJSETUP(str2, cString, T_STRING);
str2->len = str->len;
str2->ptr = str->ptr;
str2->orig = str;
if (rb_safe_level() >= 3) {
FL_SET(str2, STR_TAINT);
}
return (VALUE)str2;
}
VALUE
str_new4(orig)
struct RString *orig;
{
NEWOBJ(str, struct RString);
OBJSETUP(str, cString, T_STRING);
str->len = orig->len;
str->ptr = orig->ptr;
if (orig->orig) {
str->orig = orig->orig;
}
else {
orig->orig = str;
str->orig = 0;
}
if (rb_safe_level() >= 3) {
FL_SET(str, STR_TAINT);
}
return (VALUE)str;
}
#define as_str(str) (struct RString*)obj_as_string(str)
static ID pr_str;
VALUE
obj_as_string(obj)
VALUE obj;
{
VALUE str;
if (TYPE(obj) == T_STRING) {
return obj;
}
str = rb_funcall(obj, pr_str, 0);
if (TYPE(str) != T_STRING)
return any_to_s(obj);
return str;
}
static VALUE
str_clone(orig)
struct RString *orig;
{
VALUE str;
if (orig->orig)
str = str_new3(orig->orig);
else
str = str_new(orig->ptr, orig->len);
CLONESETUP(str, orig);
return str;
}
VALUE
str_dup(str)
struct RString *str;
{
VALUE s = str_new(str->ptr, str->len);
if (str_tainted(str)) s = str_taint(s);
return s;
}
static VALUE
str_s_new(class, orig)
VALUE class;
struct RString *orig;
{
NEWOBJ(str, struct RString);
OBJSETUP(str, class, T_STRING);
orig = as_str(orig);
str->len = orig->len;
str->ptr = ALLOC_N(char, orig->len+1);
if (str->ptr) {
memcpy(str->ptr, orig->ptr, orig->len);
}
str->ptr[orig->len] = '\0';
str->orig = 0;
if (rb_safe_level() >= 3) {
FL_SET(str, STR_TAINT);
}
return (VALUE)str;
}
static VALUE
str_length(str)
struct RString *str;
{
return INT2FIX(str->len);
}
VALUE
str_plus(str1, str2)
struct RString *str1, *str2;
{
struct RString *str3;
str2 = as_str(str2);
str3 = (struct RString*)str_new(0, str1->len+str2->len);
memcpy(str3->ptr, str1->ptr, str1->len);
memcpy(str3->ptr+str1->len, str2->ptr, str2->len);
str3->ptr[str3->len] = '\0';
if (str_tainted(str1) || str_tainted(str2))
return str_taint(str3);
return (VALUE)str3;
}
VALUE
str_times(str, times)
struct RString *str;
VALUE times;
{
struct RString *str2;
int i, len;
len = NUM2INT(times);
if (len < 0) {
ArgError("negative argument");
}
str2 = (struct RString*)str_new(0, str->len*len);
for (i=0; i<len; i++) {
memcpy(str2->ptr+(i*str->len), str->ptr, str->len);
}
str2->ptr[str2->len] = '\0';
if (str_tainted(str))
return str_taint(str2);
return (VALUE)str2;
}
VALUE
str_substr(str, start, len)
struct RString *str;
int start, len;
{
struct RString *str2;
if (start < 0) {
start = str->len + start;
}
if (str->len <= start || len < 0) {
return str_new(0,0);
}
if (str->len < start + len) {
len = str->len - start;
}
str2 = (struct RString*)str_new(str->ptr+start, len);
return (VALUE)str2;
}
static VALUE
str_subseq(str, beg, end)
struct RString *str;
int beg, end;
{
int len;
if ((beg > 0 && end > 0 || beg < 0 && end < 0) && beg > end) {
IndexError("end smaller than beg [%d..%d]", beg, end);
}
if (beg < 0) {
beg = str->len + beg;
if (beg < 0) beg = 0;
}
if (end < 0) {
end = str->len + end;
if (end < 0) end = -1;
else if (str->len < end) {
end = str->len;
}
}
if (beg >= str->len) {
return str_new(0, 0);
}
len = end - beg + 1;
if (len < 0) {
len = 0;
}
return str_substr(str, beg, len);
}
extern VALUE ignorecase;
void
str_modify(str)
struct RString *str;
{
UCHAR *ptr;
if (rb_safe_level() >= 5) {
extern VALUE eSecurityError;
Raise(eSecurityError, "cannot change string status");
}
if (FL_TEST(str, STR_FREEZE))
TypeError("can't modify frozen string");
if (!str->orig) return;
ptr = str->ptr;
str->ptr = ALLOC_N(char, str->len+1);
if (str->ptr) {
memcpy(str->ptr, ptr, str->len);
str->ptr[str->len] = 0;
}
str->orig = 0;
}
VALUE
str_freeze(str)
VALUE str;
{
FL_SET(str, STR_FREEZE);
return str;
}
static VALUE
str_frozen_p(str)
VALUE str;
{
if (FL_TEST(str, STR_FREEZE))
return TRUE;
return FALSE;
}
VALUE
str_dup_freezed(str)
VALUE str;
{
str = str_dup(str);
str_freeze(str);
return str;
}
VALUE
str_taint(str)
VALUE str;
{
if (TYPE(str) == T_STRING) {
FL_SET(str, STR_TAINT);
}
return str;
}
VALUE
str_tainted(str)
VALUE str;
{
if (FL_TEST(str, STR_TAINT))
return TRUE;
return FALSE;
}
VALUE
str_resize(str, len)
struct RString *str;
int len;
{
str_modify(str);
if (len >= 0) {
if (str->len < len || str->len - len > 1024) {
REALLOC_N(str->ptr, char, len + 1);
}
str->len = len;
str->ptr[len] = '\0'; /* sentinel */
}
return (VALUE)str;
}
VALUE
str_cat(str, ptr, len)
struct RString *str;
UCHAR *ptr;
UINT len;
{
if (len > 0) {
str_modify(str);
REALLOC_N(str->ptr, char, str->len + len + 1);
if (ptr)
memcpy(str->ptr + str->len, ptr, len);
str->len += len;
str->ptr[str->len] = '\0'; /* sentinel */
}
return (VALUE)str;
}
static VALUE
str_concat(str1, str2)
struct RString *str1, *str2;
{
str2 = as_str(str2);
str_cat(str1, str2->ptr, str2->len);
return (VALUE)str1;
}
int
str_hash(str)
struct RString *str;
{
int len = str->len;
UCHAR *p = str->ptr;
int key = 0;
if (ignorecase) {
while (len--) {
key = key*65599 + toupper(*p);
p++;
}
}
else {
while (len--) {
key = key*65599 + *p;
p++;
}
}
return key;
}
static VALUE
str_hash_method(str)
VALUE str;
{
int key = str_hash(str);
return INT2FIX(key);
}
#define min(a,b) (((a)>(b))?(b):(a))
int
str_cmp(str1, str2)
struct RString *str1, *str2;
{
UINT len;
int retval;
if (ignorecase != FALSE) {
return str_cicmp(str1, str2);
}
len = min(str1->len, str2->len);
retval = memcmp(str1->ptr, str2->ptr, len);
if (retval == 0) {
return str1->ptr[len] - str2->ptr[len];
}
return retval;
}
static VALUE
str_equal(str1, str2)
struct RString *str1, *str2;
{
if (TYPE(str2) != T_STRING)
return FALSE;
if (str1->len == str2->len
&& str_cmp(str1, str2) == 0) {
return TRUE;
}
return FALSE;
}
static VALUE
str_cmp_method(str1, str2)
VALUE str1, str2;
{
int result;
str2 = obj_as_string(str2);
result = str_cmp(str1, str2);
return INT2FIX(result);
}
VALUE Freg_match();
static VALUE
str_match(x, y)
struct RString *x, *y;
{
VALUE reg;
int start;
switch (TYPE(y)) {
case T_REGEXP:
return reg_match(y, x);
case T_STRING:
reg = reg_regcomp(y);
start = reg_search(reg, x, 0, 0);
if (start == -1) {
return FALSE;
}
return INT2FIX(start);
default:
TypeError("type mismatch");
break;
}
}
static VALUE
str_match2(str)
struct RString *str;
{
return reg_match2(reg_regcomp(str));
}
static int
str_index(str, sub, offset)
struct RString *str, *sub;
int offset;
{
UCHAR *s, *e, *p;
int len;
if (str->len - offset < sub->len) return -1;
s = str->ptr+offset;
p = sub->ptr;
len = sub->len;
e = s + str->len - len + 1;
while (s < e) {
if (*s == *(sub->ptr) && memcmp(s, p, len) == 0) {
return (s-(str->ptr));
}
s++;
}
return -1;
}
static VALUE
str_index_method(argc, argv, str)
int argc;
VALUE *argv;
struct RString *str;
{
struct RString *sub;
VALUE initpos;
int pos;
if (rb_scan_args(argc, argv, "11", &sub, &initpos) == 2) {
pos = NUM2INT(initpos);
}
else {
pos = 0;
}
switch (TYPE(sub)) {
case T_REGEXP:
pos = reg_search(sub, str, pos, (struct re_registers *)-1);
break;
case T_STRING:
pos = str_index(str, sub, pos);
break;
default:
TypeError("Type mismatch: %s given", rb_class2name(CLASS_OF(sub)));
}
if (pos == -1) return Qnil;
return INT2FIX(pos);
}
static VALUE
str_rindex(argc, argv, str)
int argc;
VALUE *argv;
struct RString *str;
{
struct RString *sub;
VALUE initpos;
int pos, len;
UCHAR *s, *sbeg, *t;
if (rb_scan_args(argc, argv, "11", &sub, &initpos) == 2) {
pos = NUM2INT(initpos);
if (pos >= str->len) pos = str->len;
}
else {
pos = str->len;
}
Check_Type(sub, T_STRING);
if (pos > str->len) return Qnil; /* substring longer than string */
sbeg = str->ptr; s = sbeg + pos - sub->len;
t = sub->ptr;
len = sub->len;
while (sbeg <= s) {
if (*s == *t && memcmp(s, t, len) == 0) {
return INT2FIX(s - sbeg);
}
s--;
}
return Qnil;
}
static UCHAR
succ_char(s)
UCHAR *s;
{
char c = *s;
/* numerics */
if ('0' <= c && c < '9') (*s)++;
else if (c == '9') {
*s = '0';
return '1';
}
/* small alphabets */
else if ('a' <= c && c < 'z') (*s)++;
else if (c == 'z') {
return *s = 'a';
}
/* capital alphabets */
else if ('A' <= c && c < 'Z') (*s)++;
else if (c == 'Z') {
return *s = 'A';
}
return 0;
}
static VALUE
str_succ(orig)
struct RString *orig;
{
struct RString *str, *str2;
UCHAR *sbeg, *s;
char c = -1;
str = (struct RString*)str_new(orig->ptr, orig->len);
sbeg = str->ptr; s = sbeg + str->len - 1;
while (sbeg <= s) {
if (isalnum(*s) && (c = succ_char(s)) == 0) break;
s--;
}
if (s < sbeg) {
if (c == -1 && str->len > 0) {
str->ptr[str->len-1] += 1;
}
else {
str2 = (struct RString*)str_new(0, str->len+1);
str2->ptr[0] = c;
memcpy(str2->ptr+1, str->ptr, str->len);
str = str2;
}
}
if (str_tainted(orig))
return str_taint(str);
return (VALUE)str;
}
VALUE
str_upto(beg, end)
VALUE beg, end;
{
VALUE current;
Check_Type(end, T_STRING);
if (RTEST(rb_funcall(beg, '>', 1, end)))
return Qnil;
current = beg;
for (;;) {
rb_yield(current);
if (str_equal(current, end)) break;
current = str_succ(current);
if (RSTRING(current)->len > RSTRING(end)->len)
break;
}
return Qnil;
}
static VALUE
str_aref(str, indx)
struct RString *str;
VALUE indx;
{
int idx;
switch (TYPE(indx)) {
case T_FIXNUM:
idx = FIX2INT(indx);
if (idx < 0) {
idx = str->len + idx;
}
if (idx < 0 || str->len <= idx) {
return Qnil;
}
return (VALUE)INT2FIX(str->ptr[idx] & 0xff);
case T_REGEXP:
if (str_match(str, indx))
return reg_last_match(0);
return Qnil;
case T_STRING:
if (str_index(str, indx, 0) != -1) return indx;
return Qnil;
default:
/* check if indx is Range */
{
int beg, end;
if (range_beg_end(indx, &beg, &end)) {
return str_subseq(str, beg, end);
}
}
IndexError("Invalid index for string");
}
}
static VALUE
str_aref_method(argc, argv, str)
int argc;
VALUE *argv;
struct RString *str;
{
VALUE arg1, arg2;
if (rb_scan_args(argc, argv, "11", &arg1, &arg2) == 2) {
return str_substr(str, NUM2INT(arg1), NUM2INT(arg2));
}
return str_aref(str, arg1);
}
static void
str_replace(str, beg, len, val)
struct RString *str, *val;
int beg, len;
{
if (len < val->len) {
/* expand string */
REALLOC_N(str->ptr, char, str->len+val->len-len+1);
}
if (len != val->len) {
memmove(str->ptr+beg+val->len, str->ptr+beg+len, str->len-(beg+len));
}
memcpy(str->ptr+beg, val->ptr, val->len);
str->len += val->len - len;
str->ptr[str->len] = '\0';
}
/* str_replace2() understands negatice offset */
static void
str_replace2(str, beg, end, val)
struct RString *str, *val;
int beg, end;
{
int len;
if ((beg > 0 && end > 0 || beg < 0 && end < 0) && beg > end) {
IndexError("end smaller than beg [%d..%d]", beg, end);
}
if (beg < 0) {
beg = str->len + beg;
if (beg < 0) {
beg = 0;
}
}
if (str->len <= beg) {
beg = str->len;
}
if (end < 0) {
end = str->len + end;
if (end < 0) {
end = 0;
}
}
if (str->len <= end) {
end = str->len - 1;
}
len = end - beg + 1; /* length of substring */
if (len < 0) {
len = 0;
}
str_replace(str, beg, len, val);
}
static VALUE
str_sub_s(str, pat, val, once)
struct RString *str;
struct RRegexp *pat;
VALUE val;
int once;
{
VALUE result, repl;
int beg, offset, n;
struct re_registers *regs;
switch (TYPE(pat)) {
case T_REGEXP:
break;
case T_STRING:
pat = (struct RRegexp*)reg_regcomp(pat);
break;
default:
/* type failed */
Check_Type(pat, T_REGEXP);
}
val = obj_as_string(val);
result = str_new(0,0);
offset=0; n=0;
while ((beg=reg_search(pat, str, offset, 0)) >= 0) {
n++;
regs = RMATCH(backref_get())->regs;
str_cat(result, str->ptr+offset, beg-offset);
repl = reg_regsub(val, str, regs);
str_cat(result, RSTRING(repl)->ptr, RSTRING(repl)->len);
if (END(0) == offset) {
/*
* Always consume at least one character of the input string
* in order to prevent infinite loops.
*/
if (str->len) str_cat(result, str->ptr+END(0), 1);
offset = END(0)+1;
}
else {
offset = END(0);
}
if (once) break;
if (offset >= STRLEN(str)) break;
}
if (n == 0) return Qnil;
if (str->len > offset) {
str_cat(result, str->ptr+offset, str->len-offset);
}
if (str_tainted(val)) str_taint(result);
return result;
}
static VALUE
str_sub_f(str, pat, val, once)
struct RString *str;
VALUE pat;
VALUE val;
int once;
{
VALUE result;
str_modify(str);
result = str_sub_s(str, pat, val, once);
if (NIL_P(result)) return Qnil;
str_resize(str, RSTRING(result)->len);
memcpy(str->ptr, RSTRING(result)->ptr, RSTRING(result)->len);
if (str_tainted(result)) str_taint(str);
return (VALUE)str;
}
static VALUE
str_sub_iter_s(str, pat, once)
struct RString *str;
VALUE pat;
int once;
{
VALUE val, result;
int beg, offset, n, null;
struct re_registers *regs;
if (!iterator_p()) {
ArgError("Wrong # of arguments(1 for 2)");
}
switch (TYPE(pat)) {
case T_REGEXP:
break;
case T_STRING:
pat = reg_regcomp(pat);
break;
default:
/* type failed */
Check_Type(pat, T_REGEXP);
}
result = str_new(0,0);
n = 0; offset = 0;
while ((beg=reg_search(pat, str, offset, 0)) >= 0) {
n++;
null = 0;
regs = RMATCH(backref_get())->regs;
str_cat(result, str->ptr+offset, beg-offset);
if (END(0) == offset) {
null = 1;
offset = END(0)+1;
}
else {
offset = END(0);
}
val = rb_yield(reg_nth_match(0, backref_get()));
val = obj_as_string(val);
str_cat(result, RSTRING(val)->ptr, RSTRING(val)->len);
if (null && str->len) {
str_cat(result, str->ptr+offset-1, 1);
}
if (once) break;
if (offset >= STRLEN(str)) break;
}
if (n == 0) return Qnil;
if (str->len > offset) {
str_cat(result, str->ptr+offset, str->len-offset);
}
return result;
}
static VALUE
str_sub_iter_f(str, pat, once)
struct RString *str;
VALUE pat;
int once;
{
VALUE result;
str_modify(str);
result = str_sub_iter_s(str, pat, once);
if (NIL_P(result)) return Qnil;
str_resize(str, RSTRING(result)->len);
memcpy(str->ptr, RSTRING(result)->ptr, RSTRING(result)->len);
return (VALUE)str;
}
static VALUE
str_aset(str, indx, val)
struct RString *str;
VALUE indx, val;
{
int idx, beg, end, offset;
switch (TYPE(indx)) {
case T_FIXNUM:
idx = NUM2INT(indx);
if (idx < 0) {
idx = str->len + idx;
}
if (idx < 0 || str->len <= idx) {
IndexError("index %d out of range [0..%d]", idx, str->len-1);
}
str->ptr[idx] = FIX2INT(val) & 0xff;
return val;
case T_REGEXP:
str_sub_f(str, indx, val, 0);
return val;
case T_STRING:
for (offset=0;
(beg=str_index(str, indx, offset)) >= 0;
offset=beg+STRLEN(val)) {
end = beg + STRLEN(indx) - 1;
str_replace2(str, beg, end, val);
}
if (offset == 0) return Qnil;
return val;
default:
/* check if indx is Range */
{
int beg, end;
if (range_beg_end(indx, &beg, &end)) {
str_replace2(str, beg, end, val);
return val;
}
}
IndexError("Invalid index for string");
}
}
static VALUE
str_aset_method(argc, argv, str)
int argc;
VALUE *argv;
struct RString *str;
{
VALUE arg1, arg2, arg3;
str_modify(str);
if (rb_scan_args(argc, argv, "21", &arg1, &arg2, &arg3) == 3) {
int beg, len;
Check_Type(arg3, T_STRING);
beg = NUM2INT(arg1);
if (beg < 0) {
beg = str->len + beg;
if (beg < 0) beg = 0;
}
len = NUM2INT(arg2);