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@ -3,6 +3,9 @@
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#include "mbed.h"
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#include "MicroBit.h"
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#define printf(...) uBit.serial.printf(__VA_ARGS__)
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static const char empty[] __attribute__ ((aligned (4))) = "\xff\xff\0\0\0";
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/**
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* Internal constructor helper.
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@ -10,11 +13,7 @@
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*/
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void ManagedString::initEmpty()
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{
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data = ManagedString::EmptyString.data;
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ref = ManagedString::EmptyString.ref;
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len = ManagedString::EmptyString.len;
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(*ref)++;
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ptr = (StringData*)(void*)empty;
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}
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/**
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@ -25,11 +24,11 @@ void ManagedString::initString(const char *str)
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{
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// Initialise this ManagedString as a new string, using the data provided.
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// We assume the string is sane, and null terminated.
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len = strlen(str);
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data = (char *) malloc(len+1);
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memcpy(data, str, len+1);
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ref = (int16_t *) malloc(sizeof(int16_t));
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*ref = 1;
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int len = strlen(str);
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ptr = (StringData *) malloc(4+len+1);
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ptr->size = len;
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ptr->refcnt = 1;
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memcpy(ptr->data, str, len+1);
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}
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@ -65,7 +64,6 @@ ManagedString::ManagedString(const int value)
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*/
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ManagedString::ManagedString(const char value)
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{
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char str[2] = {value, 0};
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initString(str);
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}
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@ -82,7 +80,7 @@ ManagedString::ManagedString(const char value)
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ManagedString::ManagedString(const char *str)
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{
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// Sanity check. Return EmptyString for anything distasteful
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if ((str == NULL || *str == 0) && this != &ManagedString::EmptyString)
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if (str == NULL || *str == 0)
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{
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initEmpty();
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return;
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@ -94,19 +92,17 @@ ManagedString::ManagedString(const char *str)
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ManagedString::ManagedString(const ManagedString &s1, const ManagedString &s2)
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{
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// Calculate length of new string.
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len = s1.len + s2.len;
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int len = s1.length() + s2.length();
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// Create a new buffer for holding the new string data.
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data = (char *) malloc(len+1);
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ptr = (StringData*) malloc(4+len+1);
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ptr->size = len;
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ptr->refcnt = 1;
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// Enter the data, and terminate the string.
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memcpy(data, s1.data, s1.len);
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memcpy(data + s1.len, s2.data, s2.len);
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data[len] = 0;
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// Initialise the ref count and we're done.
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ref = (int16_t *) malloc(sizeof(int16_t));
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*ref = 1;
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memcpy(ptr->data, s1.toCharArray(), s1.length());
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memcpy(ptr->data + s1.length(), s2.toCharArray(), s2.length());
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ptr->data[len] = 0;
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}
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@ -133,17 +129,14 @@ ManagedString::ManagedString(const char *str, const int16_t length)
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return;
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}
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// Store the length of the new string
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len = length;
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// Allocate a new buffer, and create a NULL terminated string.
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data = (char *) malloc(len+1);
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memcpy(data, str, len);
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data[len] = 0;
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// Initialize a refcount and we're done.
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ref = (int16_t *) malloc(sizeof(int16_t));
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*ref = 1;
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ptr = (StringData*) malloc(4+length+1);
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// Store the length of the new string
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ptr->size = length;
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ptr->refcnt = 1;
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memcpy(ptr->data, str, length);
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ptr->data[length] = 0;
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}
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/**
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@ -161,11 +154,8 @@ ManagedString::ManagedString(const char *str, const int16_t length)
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*/
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ManagedString::ManagedString(const ManagedString &s)
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{
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data = s.data;
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ref = s.ref;
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len = s.len;
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(*ref)++;
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ptr = s.ptr;
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ptr->incr();
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}
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@ -193,11 +183,7 @@ ManagedString::ManagedString()
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*/
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ManagedString::~ManagedString()
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{
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if(--(*ref) == 0)
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{
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free(data);
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free(ref);
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}
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ptr->decr();
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}
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/**
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@ -220,19 +206,12 @@ ManagedString::~ManagedString()
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*/
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ManagedString& ManagedString::operator = (const ManagedString& s)
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{
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if(this == &s)
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if (this->ptr == s.ptr)
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return *this;
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if(--(*ref) == 0)
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{
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free(data);
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free(ref);
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}
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data = s.data;
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ref = s.ref;
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len = s.len;
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(*ref)++;
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ptr->decr();
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ptr = s.ptr;
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ptr->incr();
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return *this;
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}
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@ -258,7 +237,7 @@ ManagedString& ManagedString::operator = (const ManagedString& s)
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*/
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bool ManagedString::operator== (const ManagedString& s)
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{
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return ((len == s.len) && (memcmp(data,s.data,len)==0));
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return ((length() == s.length()) && (memcmp(toCharArray(),s.toCharArray(),s.length())==0));
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}
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/**
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@ -282,7 +261,7 @@ bool ManagedString::operator== (const ManagedString& s)
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*/
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bool ManagedString::operator< (const ManagedString& s)
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{
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return (memcmp(data, s.data,min(len,s.len))<0);
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return (memcmp(toCharArray(), s.toCharArray(), min(length(),s.length()))<0);
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}
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/**
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@ -306,7 +285,7 @@ bool ManagedString::operator< (const ManagedString& s)
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*/
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bool ManagedString::operator> (const ManagedString& s)
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{
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return (memcmp(data, s.data,min(len,s.len))>0);
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return (memcmp(toCharArray(), s.toCharArray(), min(length(),s.length()))>0);
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}
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/**
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@ -326,14 +305,14 @@ bool ManagedString::operator> (const ManagedString& s)
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ManagedString ManagedString::substring(int16_t start, int16_t length)
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{
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// If the parameters are illegal, just return a reference to the empty string.
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if (start >= len)
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if (start >= this->length())
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return ManagedString(ManagedString::EmptyString);
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// Compute a safe copy length;
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length = min(len-start, length);
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length = min(this->length()-start, length);
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// Build a ManagedString from this.
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return ManagedString(data+start, length);
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return ManagedString(toCharArray()+start, length);
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}
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/**
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@ -352,20 +331,16 @@ ManagedString ManagedString::substring(int16_t start, int16_t length)
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*/
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ManagedString ManagedString::operator+ (ManagedString& s)
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{
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//printf("add(%d,%d)\n", this->length(), s.length()); uBit.sleep(100);
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// If the other string is empty, nothing to do!
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if(s.len == 0)
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if(s.length() == 0)
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return *this;
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if (len == 0)
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return s;
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if(s == ManagedString::EmptyString)
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return *this;
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if(*this == ManagedString::EmptyString)
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if (length() == 0)
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return s;
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return ManagedString(data, s.data);
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return ManagedString(*this, s);
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}
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@ -384,39 +359,40 @@ ManagedString ManagedString::operator+ (ManagedString& s)
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*/
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char ManagedString::charAt(int16_t index)
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{
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return (index >=0 && index < len) ? data[index] : 0;
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return (index >=0 && index < length()) ? ptr->data[index] : 0;
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}
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/**
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* Provides an immutable 8 bit wide haracter buffer representing this string.
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*
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* @return a pointer to the charcter buffer.
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*/
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const char *ManagedString::toCharArray()
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* Empty string constant literal
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*/
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ManagedString ManagedString::EmptyString((StringData*)(void*)empty);
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void RefCounted::incr()
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{
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return data;
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if (refcnt == 0xffff)
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return;
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if (refcnt == 0)
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uBit.panic(30);
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refcnt++;
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}
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/**
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* Determines the length of this ManagedString in characters.
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*
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* @return the length of the string in characters.
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*
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* Example:
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* @code
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* ManagedString s("abcd");
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*
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* print(s.length()) // prints "4"
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* @endcode
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*/
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int16_t ManagedString::length()
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void RefCounted::decr()
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{
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return len;
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if (refcnt == 0xffff)
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return;
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if (refcnt == 0)
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uBit.panic(31);
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refcnt--;
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if (refcnt == 0) {
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// size of 0xffff indicates a class with a virtual destructor
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if (size == 0xffff)
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delete (VirtualRefCounted*)this;
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else
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free(this);
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}
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}
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/**
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* Empty string constant literal
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*/
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ManagedString ManagedString::EmptyString("\0");
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VirtualRefCounted::~VirtualRefCounted()
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{
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}
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