Diff: WString.cpp

Revision:

0:740c1eb2df13

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WString.cpp	Thu Jun 23 11:16:14 2016 +0000
@@ -0,0 +1,908 @@
+/*
+  WString.cpp - String library for Wiring & Arduino
+  ...mostly rewritten by Paul Stoffregen...
+  Copyright (c) 2009-10 Hernando Barragan.  All rights reserved.
+  Copyright 2011, Paul Stoffregen, paul@pjrc.com
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library 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
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+#include <stdint.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <math.h>
+#include "WString.h"
+
+/*整形转字符型*/
+char *itoa(int value, char *string, int radix)
+{
+    char tmp[33];
+    char *tp = tmp;
+    int i;
+    unsigned v;
+    int sign;
+    char *sp;
+
+    if (radix > 36 || radix <= 1) {
+        //__set_errno(EDOM);
+        return 0;
+    }
+
+    sign = (radix == 10 && value < 0);
+    if (sign)
+        v = -value;
+    else
+        v = (unsigned)value;
+    while (v || tp == tmp) {
+        i = v % radix;
+        v = v / radix;
+        if (i < 10)
+            *tp++ = i+'0';
+        else
+            *tp++ = i + 'a' - 10;
+    }
+
+    if (string == 0)
+        string = (char *)malloc((tp-tmp)+sign+1);
+    sp = string;
+
+    if (sign)
+        *sp++ = '-';
+    while (tp > tmp)
+        *sp++ = *--tp;
+    *sp = 0;
+    return string;
+}
+
+/*长整形转字符型*/
+char *ltoa(long value, char *string, int radix)
+{
+    char tmp[33];
+    char *tp = tmp;
+    long i;
+    unsigned long v;
+    int sign;
+    char *sp;
+
+    if (radix > 36 || radix <= 1) {
+        //__set_errno(EDOM);
+        return 0;
+    }
+
+    sign = (radix == 10 && value < 0);
+    if (sign)
+        v = -value;
+    else
+        v = (unsigned long)value;
+    while (v || tp == tmp) {
+        i = v % radix;
+        v = v / radix;
+        if (i < 10)
+            *tp++ = i+'0';
+        else
+            *tp++ = i + 'a' - 10;
+    }
+
+    if (string == 0)
+        string = (char *)malloc((tp-tmp)+sign+1);
+    sp = string;
+
+    if (sign)
+        *sp++ = '-';
+    while (tp > tmp)
+        *sp++ = *--tp;
+    *sp = 0;
+    return string;
+}
+
+/*无符号长整形转字符型*/
+char *ultoa(unsigned long value, char *string, int radix)
+{
+    char tmp[33];
+    char *tp = tmp;
+    long i;
+    unsigned long v = value;
+    char *sp;
+
+    if (radix > 36 || radix <= 1) {
+        //__set_errno(EDOM);
+        return 0;
+    }
+
+
+    while (v || tp == tmp) {
+        i = v % radix;
+        v = v / radix;
+        if (i < 10)
+            *tp++ = i+'0';
+        else
+            *tp++ = i + 'a' - 10;
+    }
+    if (string == 0)
+        string = (char *)malloc((tp-tmp)+1);
+    sp = string;
+
+    while (tp > tmp)
+        *sp++ = *--tp;
+    *sp = 0;
+    return string;
+}
+
+/*字符串转整形*/
+//#include "iostream.h"
+int toi(const char * s)
+{
+    int n = 0;
+
+    while(!(*s >= '0' && *s <= '9'))
+        s++;
+
+    while(*s >= '0' && *s <= '9') {
+        n *= 10;
+        n += *s - '0';
+        s++;
+    }
+    return n;
+}
+/*********************************************/
+/*  Constructors                             */
+/*********************************************/
+
+String::String(const char *cstr)
+{
+    init();
+    if (cstr) copy(cstr, strlen(cstr));
+}
+
+String::String(const String &value)
+{
+    init();
+    *this = value;
+}
+
+#if 0
+String::String(const __FlashStringHelper *pstr)
+{
+    init();
+    *this = pstr;
+}
+#endif
+
+#if __cplusplus >= 201103L || defined(__GXX_EXPERIMENTAL_CXX0X__)
+String::String(String &&rval)
+{
+    init();
+    move(rval);
+}
+String::String(StringSumHelper &&rval)
+{
+    init();
+    move(rval);
+}
+#endif
+
+String::String(char c)
+{
+    init();
+    char buf[2];
+    buf[0] = c;
+    buf[1] = 0;
+    *this = buf;
+}
+
+String::String(unsigned char value, unsigned char base)
+{
+    init();
+    char buf[1 + 8 * sizeof(unsigned char)];
+    //utoa(value, buf, base);
+    itoa(value, buf, base);
+    *this = buf;
+}
+
+String::String(int value, unsigned char base)
+{
+    init();
+    char buf[2 + 8 * sizeof(int)];
+    itoa(value, buf, base);
+    //sprintf(buf, "%x", value); //将100转为16进制表示的字符串。
+    *this = buf;
+}
+
+String::String(unsigned int value, unsigned char base)
+{
+    init();
+    char buf[1 + 8 * sizeof(unsigned int)];
+    //utoa(value, buf, base);
+    itoa(value, buf, base);
+    *this = buf;
+}
+
+String::String(long value, unsigned char base)
+{
+    init();
+    char buf[2 + 8 * sizeof(long)];
+    ltoa(value, buf, base);
+    *this = buf;
+}
+
+String::String(unsigned long value, unsigned char base)
+{
+    init();
+    char buf[1 + 8 * sizeof(unsigned long)];
+    //ultoa(value, buf, base);
+    ultoa(value, buf, base);
+    *this = buf;
+}
+
+String::String(float value, unsigned char decimalPlaces)
+{
+    init();
+    char buf[33];
+    #if 0 // TODO:
+    *this = dtostrf(value, (decimalPlaces + 2), decimalPlaces, buf);
+    #endif
+}
+
+String::String(double value, unsigned char decimalPlaces)
+{
+    init();
+    char buf[33];
+    #if 0 // TODO:
+    *this = dtostrf(value, (decimalPlaces + 2), decimalPlaces, buf);
+    #endif
+}
+
+String::~String()
+{
+    free(buffer);
+}
+
+/*********************************************/
+/*  Memory Management                        */
+/*********************************************/
+
+inline void String::init(void)
+{
+    buffer = NULL;
+    capacity = 0;
+    len = 0;
+}
+
+void String::invalidate(void)
+{
+    if (buffer) free(buffer);
+    buffer = NULL;
+    capacity = len = 0;
+}
+
+unsigned char String::reserve(unsigned int size)
+{
+    if (buffer && capacity >= size) return 1;
+    if (changeBuffer(size)) {
+        if (len == 0) buffer[0] = 0;
+        return 1;
+    }
+    return 0;
+}
+
+unsigned char String::changeBuffer(unsigned int maxStrLen)
+{
+    char *newbuffer = (char *)realloc(buffer, maxStrLen + 1);
+    if (newbuffer) {
+        buffer = newbuffer;
+        capacity = maxStrLen;
+        return 1;
+    }
+    return 0;
+}
+
+/*********************************************/
+/*  Copy and Move                            */
+/*********************************************/
+
+String & String::copy(const char *cstr, unsigned int length)
+{
+    if (!reserve(length)) {
+        invalidate();
+        return *this;
+    }
+    len = length;
+    strcpy(buffer, cstr);
+    return *this;
+}
+
+#if 0
+String & String::copy(const __FlashStringHelper *pstr, unsigned int length)
+{
+    if (!reserve(length)) {
+        invalidate();
+        return *this;
+    }
+    len = length;
+    strcpy_P(buffer, (PGM_P)pstr);
+    return *this;
+}
+#endif
+
+#if __cplusplus >= 201103L || defined(__GXX_EXPERIMENTAL_CXX0X__)
+void String::move(String &rhs)
+{
+    if (buffer) {
+        if (capacity >= rhs.len) {
+            strcpy(buffer, rhs.buffer);
+            len = rhs.len;
+            rhs.len = 0;
+            return;
+        } else {
+            free(buffer);
+        }
+    }
+    buffer = rhs.buffer;
+    capacity = rhs.capacity;
+    len = rhs.len;
+    rhs.buffer = NULL;
+    rhs.capacity = 0;
+    rhs.len = 0;
+}
+#endif
+
+String & String::operator = (const String &rhs)
+{
+    if (this == &rhs) return *this;
+
+    if (rhs.buffer) copy(rhs.buffer, rhs.len);
+    else invalidate();
+
+    return *this;
+}
+
+#if __cplusplus >= 201103L || defined(__GXX_EXPERIMENTAL_CXX0X__)
+String & String::operator = (String &&rval)
+{
+    if (this != &rval) move(rval);
+    return *this;
+}
+
+String & String::operator = (StringSumHelper &&rval)
+{
+    if (this != &rval) move(rval);
+    return *this;
+}
+#endif
+
+String & String::operator = (const char *cstr)
+{
+    if (cstr) copy(cstr, strlen(cstr));
+    else invalidate();
+
+    return *this;
+}
+
+#if 0
+String & String::operator = (const __FlashStringHelper *pstr)
+{
+    if (pstr) copy(pstr, strlen_P((PGM_P)pstr));
+    else invalidate();
+
+    return *this;
+}
+#endif
+
+/*********************************************/
+/*  concat                                   */
+/*********************************************/
+
+unsigned char String::concat(const String &s)
+{
+    return concat(s.buffer, s.len);
+}
+
+unsigned char String::concat(const char *cstr, unsigned int length)
+{
+    unsigned int newlen = len + length;
+    if (!cstr) return 0;
+    if (length == 0) return 1;
+    if (!reserve(newlen)) return 0;
+    strcpy(buffer + len, cstr);
+    len = newlen;
+    return 1;
+}
+
+unsigned char String::concat(const char *cstr)
+{
+    if (!cstr) return 0;
+    return concat(cstr, strlen(cstr));
+}
+
+unsigned char String::concat(char c)
+{
+    char buf[2];
+    buf[0] = c;
+    buf[1] = 0;
+    return concat(buf, 1);
+}
+
+unsigned char String::concat(unsigned char num)
+{
+    char buf[1 + 3 * sizeof(unsigned char)];
+    itoa(num, buf, 10);
+    return concat(buf, strlen(buf));
+}
+
+unsigned char String::concat(int num)
+{
+    char buf[2 + 3 * sizeof(int)];
+    itoa(num, buf, 10);
+    return concat(buf, strlen(buf));
+}
+
+unsigned char String::concat(unsigned int num)
+{
+    char buf[1 + 3 * sizeof(unsigned int)];
+    //utoa(num, buf, 10);
+    itoa(num, buf, 10);
+    return concat(buf, strlen(buf));
+}
+
+unsigned char String::concat(long num)
+{
+    char buf[2 + 3 * sizeof(long)];
+    ltoa(num, buf, 10);
+    return concat(buf, strlen(buf));
+}
+
+unsigned char String::concat(unsigned long num)
+{
+    char buf[1 + 3 * sizeof(unsigned long)];
+    ultoa(num, buf, 10);
+    return concat(buf, strlen(buf));
+}
+
+unsigned char String::concat(float num)
+{
+    char buf[20];
+    //char* string = dtostrf(num, 4, 2, buf);
+    sprintf(buf, "%6.2f", num); //将100转为16进制表示的字符串。
+    //return concat(string, strlen(string));
+    return concat(buf, strlen(buf));
+}
+
+unsigned char String::concat(double num)
+{
+    char buf[20];
+    //char* string = dtostrf(num, 4, 2, buf);
+    sprintf(buf, "%6.2f", num); //将100转为16进制表示的字符串。
+    //return concat(string, strlen(string));
+    return concat(buf, strlen(buf));
+}
+#if 0
+unsigned char String::concat(const __FlashStringHelper * str)
+{
+    if (!str) return 0;
+    int length = strlen_P((const char *) str);
+    if (length == 0) return 1;
+    unsigned int newlen = len + length;
+    if (!reserve(newlen)) return 0;
+    strcpy_P(buffer + len, (const char *) str);
+    len = newlen;
+    return 1;
+}
+#endif
+/*********************************************/
+/*  Concatenate                              */
+/*********************************************/
+
+StringSumHelper & operator + (const StringSumHelper &lhs, const String &rhs)
+{
+    StringSumHelper &a = const_cast<StringSumHelper&>(lhs);
+    if (!a.concat(rhs.buffer, rhs.len)) a.invalidate();
+    return a;
+}
+
+StringSumHelper & operator + (const StringSumHelper &lhs, const char *cstr)
+{
+    StringSumHelper &a = const_cast<StringSumHelper&>(lhs);
+    if (!cstr || !a.concat(cstr, strlen(cstr))) a.invalidate();
+    return a;
+}
+
+StringSumHelper & operator + (const StringSumHelper &lhs, char c)
+{
+    StringSumHelper &a = const_cast<StringSumHelper&>(lhs);
+    if (!a.concat(c)) a.invalidate();
+    return a;
+}
+
+StringSumHelper & operator + (const StringSumHelper &lhs, unsigned char num)
+{
+    StringSumHelper &a = const_cast<StringSumHelper&>(lhs);
+    if (!a.concat(num)) a.invalidate();
+    return a;
+}
+
+StringSumHelper & operator + (const StringSumHelper &lhs, int num)
+{
+    StringSumHelper &a = const_cast<StringSumHelper&>(lhs);
+    if (!a.concat(num)) a.invalidate();
+    return a;
+}
+
+StringSumHelper & operator + (const StringSumHelper &lhs, unsigned int num)
+{
+    StringSumHelper &a = const_cast<StringSumHelper&>(lhs);
+    if (!a.concat(num)) a.invalidate();
+    return a;
+}
+
+StringSumHelper & operator + (const StringSumHelper &lhs, long num)
+{
+    StringSumHelper &a = const_cast<StringSumHelper&>(lhs);
+    if (!a.concat(num)) a.invalidate();
+    return a;
+}
+
+StringSumHelper & operator + (const StringSumHelper &lhs, unsigned long num)
+{
+    StringSumHelper &a = const_cast<StringSumHelper&>(lhs);
+    if (!a.concat(num)) a.invalidate();
+    return a;
+}
+
+StringSumHelper & operator + (const StringSumHelper &lhs, float num)
+{
+    StringSumHelper &a = const_cast<StringSumHelper&>(lhs);
+    if (!a.concat(num)) a.invalidate();
+    return a;
+}
+
+StringSumHelper & operator + (const StringSumHelper &lhs, double num)
+{
+    StringSumHelper &a = const_cast<StringSumHelper&>(lhs);
+    if (!a.concat(num)) a.invalidate();
+    return a;
+}
+
+#if 0
+StringSumHelper & operator + (const StringSumHelper &lhs, const __FlashStringHelper *rhs)
+{
+    StringSumHelper &a = const_cast<StringSumHelper&>(lhs);
+    if (!a.concat(rhs))	a.invalidate();
+    return a;
+}
+#endif
+/*********************************************/
+/*  Comparison                               */
+/*********************************************/
+
+int String::compareTo(const String &s) const
+{
+    if (!buffer || !s.buffer) {
+        if (s.buffer && s.len > 0) return 0 - *(unsigned char *)s.buffer;
+        if (buffer && len > 0) return *(unsigned char *)buffer;
+        return 0;
+    }
+    return strcmp(buffer, s.buffer);
+}
+
+unsigned char String::equals(const String &s2) const
+{
+    return (len == s2.len && compareTo(s2) == 0);
+}
+
+unsigned char String::equals(const char *cstr) const
+{
+    if (len == 0) return (cstr == NULL || *cstr == 0);
+    if (cstr == NULL) return buffer[0] == 0;
+    return strcmp(buffer, cstr) == 0;
+}
+
+unsigned char String::operator<(const String &rhs) const
+{
+    return compareTo(rhs) < 0;
+}
+
+unsigned char String::operator>(const String &rhs) const
+{
+    return compareTo(rhs) > 0;
+}
+
+unsigned char String::operator<=(const String &rhs) const
+{
+    return compareTo(rhs) <= 0;
+}
+
+unsigned char String::operator>=(const String &rhs) const
+{
+    return compareTo(rhs) >= 0;
+}
+
+unsigned char String::equalsIgnoreCase( const String &s2 ) const
+{
+    if (this == &s2) return 1;
+    if (len != s2.len) return 0;
+    if (len == 0) return 1;
+    const char *p1 = buffer;
+    const char *p2 = s2.buffer;
+    while (*p1) {
+        if (tolower(*p1++) != tolower(*p2++)) return 0;
+    }
+    return 1;
+}
+
+unsigned char String::startsWith( const String &s2 ) const
+{
+    if (len < s2.len) return 0;
+    return startsWith(s2, 0);
+}
+
+unsigned char String::startsWith( const String &s2, unsigned int offset ) const
+{
+    if (offset > len - s2.len || !buffer || !s2.buffer) return 0;
+    return strncmp( &buffer[offset], s2.buffer, s2.len ) == 0;
+}
+
+unsigned char String::endsWith( const String &s2 ) const
+{
+    if ( len < s2.len || !buffer || !s2.buffer) return 0;
+    return strcmp(&buffer[len - s2.len], s2.buffer) == 0;
+}
+
+/*********************************************/
+/*  Character Access                         */
+/*********************************************/
+
+char String::charAt(unsigned int loc) const
+{
+    return operator[](loc);
+}
+
+void String::setCharAt(unsigned int loc, char c)
+{
+    if (loc < len) buffer[loc] = c;
+}
+
+char & String::operator[](unsigned int index)
+{
+    static char dummy_writable_char;
+    if (index >= len || !buffer) {
+        dummy_writable_char = 0;
+        return dummy_writable_char;
+    }
+    return buffer[index];
+}
+
+char String::operator[]( unsigned int index ) const
+{
+    if (index >= len || !buffer) return 0;
+    return buffer[index];
+}
+
+void String::getBytes(unsigned char *buf, unsigned int bufsize, unsigned int index) const
+{
+    if (!bufsize || !buf) return;
+    if (index >= len) {
+        buf[0] = 0;
+        return;
+    }
+    unsigned int n = bufsize - 1;
+    if (n > len - index) n = len - index;
+    strncpy((char *)buf, buffer + index, n);
+    buf[n] = 0;
+}
+
+/*********************************************/
+/*  Search                                   */
+/*********************************************/
+
+int String::indexOf(char c) const
+{
+    return indexOf(c, 0);
+}
+
+int String::indexOf( char ch, unsigned int fromIndex ) const
+{
+    if (fromIndex >= len) return -1;
+    const char* temp = strchr(buffer + fromIndex, ch);
+    if (temp == NULL) return -1;
+    return temp - buffer;
+}
+
+int String::indexOf(const String &s2) const
+{
+    return indexOf(s2, 0);
+}
+
+int String::indexOf(const String &s2, unsigned int fromIndex) const
+{
+    if (fromIndex >= len) return -1;
+    const char *found = strstr(buffer + fromIndex, s2.buffer);
+    if (found == NULL) return -1;
+    return found - buffer;
+}
+
+int String::lastIndexOf( char theChar ) const
+{
+    return lastIndexOf(theChar, len - 1);
+}
+
+int String::lastIndexOf(char ch, unsigned int fromIndex) const
+{
+    if (fromIndex >= len) return -1;
+    char tempchar = buffer[fromIndex + 1];
+    buffer[fromIndex + 1] = '\0';
+    char* temp = strrchr( buffer, ch );
+    buffer[fromIndex + 1] = tempchar;
+    if (temp == NULL) return -1;
+    return temp - buffer;
+}
+
+int String::lastIndexOf(const String &s2) const
+{
+    return lastIndexOf(s2, len - s2.len);
+}
+
+int String::lastIndexOf(const String &s2, unsigned int fromIndex) const
+{
+    if (s2.len == 0 || len == 0 || s2.len > len) return -1;
+    if (fromIndex >= len) fromIndex = len - 1;
+    int found = -1;
+    for (char *p = buffer; p <= buffer + fromIndex; p++) {
+        p = strstr(p, s2.buffer);
+        if (!p) break;
+        if ((unsigned int)(p - buffer) <= fromIndex) found = p - buffer;
+    }
+    return found;
+}
+
+String String::substring(unsigned int left, unsigned int right) const
+{
+    if (left > right) {
+        unsigned int temp = right;
+        right = left;
+        left = temp;
+    }
+    String out;
+    if (left >= len) return out;
+    if (right > len) right = len;
+    char temp = buffer[right];  // save the replaced character
+    buffer[right] = '\0';
+    out = buffer + left;  // pointer arithmetic
+    buffer[right] = temp;  //restore character
+    return out;
+}
+
+/*********************************************/
+/*  Modification                             */
+/*********************************************/
+
+void String::replace(char find, char replace)
+{
+    if (!buffer) return;
+    for (char *p = buffer; *p; p++) {
+        if (*p == find) *p = replace;
+    }
+}
+
+void String::replace(const String& find, const String& replace)
+{
+    if (len == 0 || find.len == 0) return;
+    int diff = replace.len - find.len;
+    char *readFrom = buffer;
+    char *foundAt;
+    if (diff == 0) {
+        while ((foundAt = strstr(readFrom, find.buffer)) != NULL) {
+            memcpy(foundAt, replace.buffer, replace.len);
+            readFrom = foundAt + replace.len;
+        }
+    } else if (diff < 0) {
+        char *writeTo = buffer;
+        while ((foundAt = strstr(readFrom, find.buffer)) != NULL) {
+            unsigned int n = foundAt - readFrom;
+            memcpy(writeTo, readFrom, n);
+            writeTo += n;
+            memcpy(writeTo, replace.buffer, replace.len);
+            writeTo += replace.len;
+            readFrom = foundAt + find.len;
+            len += diff;
+        }
+        strcpy(writeTo, readFrom);
+    } else {
+        unsigned int size = len; // compute size needed for result
+        while ((foundAt = strstr(readFrom, find.buffer)) != NULL) {
+            readFrom = foundAt + find.len;
+            size += diff;
+        }
+        if (size == len) return;
+        if (size > capacity && !changeBuffer(size)) return; // XXX: tell user!
+        int index = len - 1;
+        while (index >= 0 && (index = lastIndexOf(find, index)) >= 0) {
+            readFrom = buffer + index + find.len;
+            memmove(readFrom + diff, readFrom, len - (readFrom - buffer));
+            len += diff;
+            buffer[len] = 0;
+            memcpy(buffer + index, replace.buffer, replace.len);
+            index--;
+        }
+    }
+}
+
+void String::remove(unsigned int index)
+{
+    // Pass the biggest integer as the count. The remove method
+    // below will take care of truncating it at the end of the
+    // string.
+    remove(index, (unsigned int)-1);
+}
+
+void String::remove(unsigned int index, unsigned int count)
+{
+    if (index >= len) {
+        return;
+    }
+    if (count <= 0) {
+        return;
+    }
+    if (count > len - index) {
+        count = len - index;
+    }
+    char *writeTo = buffer + index;
+    len = len - count;
+    strncpy(writeTo, buffer + index + count,len - index);
+    buffer[len] = 0;
+}
+
+void String::toLowerCase(void)
+{
+    if (!buffer) return;
+    for (char *p = buffer; *p; p++) {
+        *p = tolower(*p);
+    }
+}
+
+void String::toUpperCase(void)
+{
+    if (!buffer) return;
+    for (char *p = buffer; *p; p++) {
+        *p = toupper(*p);
+    }
+}
+
+void String::trim(void)
+{
+    if (!buffer || len == 0) return;
+    char *begin = buffer;
+    while (isspace(*begin)) begin++;
+    char *end = buffer + len - 1;
+    while (isspace(*end) && end >= begin) end--;
+    len = end + 1 - begin;
+    if (begin > buffer) memcpy(buffer, begin, len);
+    buffer[len] = 0;
+}
+
+/*********************************************/
+/*  Parsing / Conversion                     */
+/*********************************************/
+
+long String::toInt(void) const
+{
+    if (buffer) return atol(buffer);
+    return 0;
+}
+
+float String::toFloat(void) const
+{
+    if (buffer) return float(atof(buffer));
+    return 0;
+}
+