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Language/OS - Multiplatform Resource Library
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gnu
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groff108.lha
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groff-1.08
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libgroff
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string.cc
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C/C++ Source or Header
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1992-08-03
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// -*- C++ -*-
/* Copyright (C) 1989, 1990, 1991, 1992 Free Software Foundation, Inc.
Written by James Clark (jjc@jclark.com)
This file is part of groff.
groff is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2, or (at your option) any later
version.
groff is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License along
with groff; see the file COPYING. If not, write to the Free Software
Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <stdio.h>
#include "stringclass.h"
#include "lib.h"
static char *salloc(int len, int *sizep);
static void sfree(char *ptr, int size);
static char *sfree_alloc(char *ptr, int size, int len, int *sizep);
static char *srealloc(char *ptr, int size, int oldlen, int newlen, int *sizep);
static char *salloc(int len, int *sizep)
{
if (len == 0) {
*sizep = 0;
return 0;
}
else
return new char[*sizep = len*2];
}
static void sfree(char *ptr, int)
{
a_delete ptr;
}
static char *sfree_alloc(char *ptr, int oldsz, int len, int *sizep)
{
if (oldsz >= len) {
*sizep = oldsz;
return ptr;
}
a_delete ptr;
if (len == 0) {
*sizep = 0;
return 0;
}
else
return new char[*sizep = len*2];
}
static char *srealloc(char *ptr, int oldsz, int oldlen, int newlen, int *sizep)
{
if (oldsz >= newlen) {
*sizep = oldsz;
return ptr;
}
if (newlen == 0) {
a_delete ptr;
*sizep = 0;
return 0;
}
else {
char *p = new char[*sizep = newlen*2];
if (oldlen < newlen && oldlen != 0)
memcpy(p, ptr, oldlen);
a_delete ptr;
return p;
}
}
string::string() : len(0), ptr(0), sz(0)
{
}
string::string(const char *p, int n) : len(n)
{
assert(n >= 0);
ptr = salloc(n, &sz);
if (n != 0)
memcpy(ptr, p, n);
}
string::string(const char *p)
{
if (p == 0) {
len = 0;
ptr = 0;
sz = 0;
}
else {
len = strlen(p);
ptr = salloc(len, &sz);
memcpy(ptr, p, len);
}
}
string::string(char c) : len(1)
{
ptr = salloc(1, &sz);
*ptr = c;
}
string::string(const string &s) : len(s.len)
{
ptr = salloc(len, &sz);
if (len != 0)
memcpy(ptr, s.ptr, len);
}
string::~string()
{
sfree(ptr, sz);
}
string &string::operator=(const string &s)
{
ptr = sfree_alloc(ptr, sz, s.len, &sz);
len = s.len;
if (len != 0)
memcpy(ptr, s.ptr, len);
return *this;
}
string &string::operator=(const char *p)
{
if (p == 0) {
sfree(ptr, len);
len = 0;
ptr = 0;
sz = 0;
}
else {
int slen = strlen(p);
ptr = sfree_alloc(ptr, sz, slen, &sz);
len = slen;
memcpy(ptr, p, len);
}
return *this;
}
string &string::operator=(char c)
{
ptr = sfree_alloc(ptr, sz, 1, &sz);
len = 1;
*ptr = c;
return *this;
}
void string::move(string &s)
{
sfree(ptr, sz);
ptr = s.ptr;
len = s.len;
sz = s.sz;
s.ptr = 0;
s.len = 0;
s.sz = 0;
}
void string::grow1()
{
ptr = srealloc(ptr, sz, len, len + 1, &sz);
}
string &string::operator+=(const char *p)
{
if (p != 0) {
int n = strlen(p);
int newlen = len + n;
if (newlen > sz)
ptr = srealloc(ptr, sz, len, newlen, &sz);
memcpy(ptr + len, p, n);
len = newlen;
}
return *this;
}
string &string::operator+=(const string &s)
{
if (s.len != 0) {
int newlen = len + s.len;
if (newlen > sz)
ptr = srealloc(ptr, sz, len, newlen, &sz);
memcpy(ptr + len, s.ptr, s.len);
len = newlen;
}
return *this;
}
void string::append(const char *p, int n)
{
if (n > 0) {
int newlen = len + n;
if (newlen > sz)
ptr = srealloc(ptr, sz, len, newlen, &sz);
memcpy(ptr + len, p, n);
len = newlen;
}
}
string::string(const char *s1, int n1, const char *s2, int n2)
{
assert(n1 >= 0 && n2 >= 0);
len = n1 + n2;
if (len == 0) {
sz = 0;
ptr = 0;
}
else {
ptr = salloc(len, &sz);
if (n1 == 0)
memcpy(ptr, s2, n2);
else {
memcpy(ptr, s1, n1);
if (n2 != 0)
memcpy(ptr + n1, s2, n2);
}
}
}
int operator<=(const string &s1, const string &s2)
{
return (s1.len <= s2.len
? s1.len == 0 || memcmp(s1.ptr, s2.ptr, s1.len) <= 0
: s2.len != 0 && memcmp(s1.ptr, s2.ptr, s2.len) < 0);
}
int operator<(const string &s1, const string &s2)
{
return (s1.len < s2.len
? s1.len == 0 || memcmp(s1.ptr, s2.ptr, s1.len) <= 0
: s2.len != 0 && memcmp(s1.ptr, s2.ptr, s2.len) < 0);
}
int operator>=(const string &s1, const string &s2)
{
return (s1.len >= s2.len
? s2.len == 0 || memcmp(s1.ptr, s2.ptr, s2.len) >= 0
: s1.len != 0 && memcmp(s1.ptr, s2.ptr, s1.len) > 0);
}
int operator>(const string &s1, const string &s2)
{
return (s1.len > s2.len
? s2.len == 0 || memcmp(s1.ptr, s2.ptr, s2.len) >= 0
: s1.len != 0 && memcmp(s1.ptr, s2.ptr, s1.len) > 0);
}
void string::set_length(int i)
{
assert(i >= 0);
if (i > sz)
ptr = srealloc(ptr, sz, len, i, &sz);
len = i;
}
void string::clear()
{
len = 0;
}
int string::search(char c) const
{
char *p = (char *)memchr(ptr, c, len);
return p ? p - ptr : -1;
}
// we silently strip nuls
char *string::extract() const
{
char *p = ptr;
int n = len;
int nnuls = 0;
for (int i = 0; i < n; i++)
if (p[i] == '\0')
nnuls++;
char *q = new char[n + 1 - nnuls];
char *r = q;
for (i = 0; i < n; i++)
if (p[i] != '\0')
*r++ = p[i];
q[n] = '\0';
return q;
}
void put_string(const string &s, FILE *fp)
{
int len = s.length();
const char *ptr = s.contents();
for (int i = 0; i < len; i++)
putc(ptr[i], fp);
}
string as_string(int i)
{
static char buf[INT_DIGITS + 2];
sprintf(buf, "%d", i);
return string(buf);
}