#ifndef SSTRING_H
#define SSTRING_H
-// These functions are implemented because each platform calls them something different
+// These functions are implemented because each platform calls them something different.
int CompareCaseInsensitive(const char *a, const char *b);
-int CompareNCaseInsensitive(const char *a, const char *b, int len);
+int CompareNCaseInsensitive(const char *a, const char *b, size_t len);
bool EqualCaseInsensitive(const char *a, const char *b);
// Define another string class.
// While it would be 'better' to use std::string, that doubles the executable size.
// An SString may contain embedded nul characters.
-/**
- * Duplicate a C string.
- * Allocate memory of the given size, or big enough to fit the string if length isn't given;
- * then copy the given string in the allocated memory.
- * @return the pointer to the new string
- */
-inline char *StringDup(
- const char *s, ///< The string to duplicate
- int len=-1) ///< The length of memory to allocate. Optional.
-{
- if (!s)
- return 0;
- if (len == -1)
- len = strlen(s);
- char *sNew = new char[len + 1];
- if (sNew) {
- strncpy(sNew, s, len);
- sNew[len] = '\0';
- }
- return sNew;
-}
-
/**
* @brief A simple string class.
+ *
* Hold the length of the string for quick operations,
* can have a buffer bigger than the string to avoid too many memory allocations and copies.
- * May have embedded zeroes as a result of @a substitute, but rely too heavily on C string
- * functions to allow reliable manipulations of these strings.
+ * May have embedded zeroes as a result of @a substitute, but relies too heavily on C string
+ * functions to allow reliable manipulations of these strings, other than simple appends, etc.
**/
class SString {
- char *s; ///< The C string
- int sSize; ///< The size of the buffer, less 1: ie. the maximum size of the string
- int sLen; ///< The size of the string in s
- int sizeGrowth; ///< Minimum growth size when appending strings
+public:
+ /** Type of string lengths (sizes) and positions (indexes). */
+ typedef size_t lenpos_t;
+ /** Out of bounds value indicating that the string argument should be measured. */
+ enum { measure_length=0xffffffffU};
+
+private:
+ char *s; ///< The C string
+ lenpos_t sSize; ///< The size of the buffer, less 1: ie. the maximum size of the string
+ lenpos_t sLen; ///< The size of the string in s
+ lenpos_t sizeGrowth; ///< Minimum growth size when appending strings
enum { sizeGrowthDefault = 64 };
+ bool grow(lenpos_t lenNew) {
+ while (sizeGrowth * 6 < lenNew) {
+ sizeGrowth *= 2;
+ }
+ char *sNew = new char[lenNew + sizeGrowth + 1];
+ if (sNew) {
+ if (s) {
+ memcpy(sNew, s, sLen);
+ delete []s;
+ }
+ s = sNew;
+ s[sLen] = '\0';
+ sSize = lenNew + sizeGrowth;
+ }
+ return sNew != 0;
+ }
-public:
- typedef int size_type;
+ SString &assign(const char *sOther, lenpos_t sSize_=measure_length) {
+ if (!sOther) {
+ sSize_ = 0;
+ } else if (sSize_ == measure_length) {
+ sSize_ = strlen(sOther);
+ }
+ if (sSize > 0 && sSize_ <= sSize) { // Does not allocate new buffer if the current is big enough
+ if (s && sSize_) {
+ memcpy(s, sOther, sSize_);
+ }
+ s[sSize_] = '\0';
+ sLen = sSize_;
+ } else {
+ delete []s;
+ s = StringAllocate(sOther, sSize_);
+ if (s) {
+ sSize = sSize_; // Allow buffer bigger than real string, thus providing space to grow
+ sLen = strlen(s);
+ } else {
+ sSize = sLen = 0;
+ }
+ }
+ return *this;
+ }
+public:
SString() : s(0), sSize(0), sLen(0), sizeGrowth(sizeGrowthDefault) {
}
SString(const SString &source) : sizeGrowth(sizeGrowthDefault) {
- s = StringDup(source.s);
+ s = StringAllocate(source.s);
sSize = sLen = (s) ? strlen(s) : 0;
}
SString(const char *s_) : sizeGrowth(sizeGrowthDefault) {
- s = StringDup(s_);
+ s = StringAllocate(s_);
sSize = sLen = (s) ? strlen(s) : 0;
}
- SString(const char *s_, int first, int last) : sizeGrowth(sizeGrowthDefault) {
- s = StringDup(s_ + first, last - first);
+ SString(const char *s_, lenpos_t first, lenpos_t last) : sizeGrowth(sizeGrowthDefault) {
+ // note: expects the "last" argument to point one beyond the range end (a la STL iterators)
+ s = StringAllocate(s_ + first, last - first);
sSize = sLen = (s) ? strlen(s) : 0;
}
SString(int i) : sizeGrowth(sizeGrowthDefault) {
char number[32];
sprintf(number, "%0d", i);
- s = StringDup(number);
+ s = StringAllocate(number);
+ sSize = sLen = (s) ? strlen(s) : 0;
+ }
+ SString(double d, int precision) : sizeGrowth(sizeGrowthDefault) {
+ char number[32];
+ sprintf(number, "%.*f", precision, d);
+ s = StringAllocate(number);
sSize = sLen = (s) ? strlen(s) : 0;
}
~SString() {
sSize = 0;
sLen = 0;
}
- void clear(void) {
+ void clear() {
if (s) {
*s = '\0';
}
sLen = 0;
}
/** Size of buffer. */
- size_type size(void) const { ///<
+ lenpos_t size() const {
if (s)
return sSize;
else
return 0;
}
/** Size of string in buffer. */
- int length() const {
+ lenpos_t length() const {
return sLen;
}
- SString &assign(const char* sOther, int sSize_ = -1) {
- if (!sOther) {
- sSize_ = 0;
- }
- if (sSize_ < 0) {
- sSize_ = strlen(sOther);
- }
- if (sSize > 0 && sSize_ <= sSize) { // Does not allocate new buffer if the current is big enough
- if (s && sSize_) {
- strncpy(s, sOther, sSize_);
- }
- s[sSize_] = '\0';
- sLen = sSize_;
- } else {
- delete []s;
- s = StringDup(sOther, sSize_);
- if (s) {
- sSize = sSize_; // Allow buffer bigger than real string, thus providing space to grow
- sLen = strlen(s);
- } else {
- sSize = sLen = 0;
- }
- }
- return *this;
- }
- SString &assign(const SString& sOther, int sSize_ = -1) {
- return assign(sOther.s, sSize_);
- }
SString &operator=(const char *source) {
return assign(source);
}
else
return false;
}
- void setsizegrowth(int sizeGrowth_) {
+ void setsizegrowth(lenpos_t sizeGrowth_) {
sizeGrowth = sizeGrowth_;
}
const char *c_str() const {
sLen = 0;
return sRet;
}
- char operator[](int i) const {
+ char operator[](lenpos_t i) const {
if (s && i < sSize) // Or < sLen? Depends on the use, both are OK
return s[i];
else
return '\0';
}
- SString &append(const char* sOther, int sLenOther=-1, char sep=0) {
- if (sLenOther < 0)
+ SString substr(lenpos_t subPos, lenpos_t subLen=measure_length) const {
+ if (subPos >= sLen) {
+ return SString(); // return a null string if start index is out of bounds
+ }
+ if ((subLen == measure_length) || (subPos + subLen > sLen)) {
+ subLen = sLen - subPos; // can't substr past end of source string
+ }
+ return SString(s, subPos, subPos + subLen);
+ }
+ SString &lowercase(lenpos_t subPos = 0, lenpos_t subLen=measure_length) {
+ if ((subLen == measure_length) || (subPos + subLen > sLen)) {
+ subLen = sLen - subPos; // don't apply past end of string
+ }
+ for (lenpos_t i = subPos; i < subPos + subLen; i++) {
+ if (s[i] < 'A' || s[i] > 'Z')
+ continue;
+ else
+ s[i] = static_cast<char>(s[i] - 'A' + 'a');
+ }
+ return *this;
+ }
+ SString &append(const char *sOther, lenpos_t sLenOther=measure_length, char sep = '\0') {
+ if (!sOther) {
+ return *this;
+ }
+ if (sLenOther == measure_length) {
sLenOther = strlen(sOther);
+ }
int lenSep = 0;
- if (sLen && sep) // Only add a separator if not empty
+ if (sLen && sep) { // Only add a separator if not empty
lenSep = 1;
- int lenNew = sLen + sLenOther + lenSep;
- if (lenNew + 1 < sSize) {
- // Conservative about growing the buffer: don't do it, unless really needed
+ }
+ lenpos_t lenNew = sLen + sLenOther + lenSep;
+ // Conservative about growing the buffer: don't do it, unless really needed
+ if ((lenNew + 1 < sSize) || (grow(lenNew))) {
if (lenSep) {
s[sLen] = sep;
sLen++;
}
- strncpy(&s[sLen], sOther, sLenOther);
- s[sLen + sLenOther] = '\0';
+ memcpy(&s[sLen], sOther, sLenOther);
sLen += sLenOther;
- } else {
- // Grow the buffer bigger than really needed, to have room for other appends
- char *sNew = new char[lenNew + sizeGrowth + 1];
- if (sNew) {
- if (s) {
- memcpy(sNew, s, sLen);
- delete []s;
- }
- s = sNew;
- sSize = lenNew + sizeGrowth;
- if (lenSep) {
- s[sLen] = sep;
- sLen++;
- }
- strncpy(&s[sLen], sOther, sLenOther);
- sNew[sLen + sLenOther] = '\0';
- sLen += sLenOther;
- }
+ s[sLen] = '\0';
}
return *this;
}
- SString &operator +=(const char *sOther) {
- return append(sOther, -1);
+ SString &operator+=(const char *sOther) {
+ return append(sOther, static_cast<lenpos_t>(measure_length));
}
- SString &operator +=(const SString &sOther) {
- return append(sOther.s, sOther.sSize);
+ SString &operator+=(const SString &sOther) {
+ return append(sOther.s, sOther.sLen);
}
- SString &operator +=(char ch) {
+ SString &operator+=(char ch) {
return append(&ch, 1);
}
- SString &appendwithseparator(const char* sOther, char sep) {
+ SString &appendwithseparator(const char *sOther, char sep) {
return append(sOther, strlen(sOther), sep);
}
+ SString &insert(lenpos_t pos, const char *sOther, lenpos_t sLenOther=measure_length) {
+ if (!sOther) {
+ return *this;
+ }
+ if (sLenOther == measure_length) {
+ sLenOther = strlen(sOther);
+ }
+ lenpos_t lenNew = sLen + sLenOther;
+ // Conservative about growing the buffer: don't do it, unless really needed
+ if ((lenNew + 1 < sSize) || grow(lenNew)) {
+ lenpos_t moveChars = sLen - pos + 1;
+ for (lenpos_t i = moveChars; i > 0; i--) {
+ s[pos + sLenOther + i - 1] = s[pos + i - 1];
+ }
+ memcpy(s + pos, sOther, sLenOther);
+ sLen = lenNew;
+ }
+ return *this;
+ }
+ /** Remove @a len characters from the @a pos position, included.
+ * Characters at pos + len and beyond replace characters at pos.
+ * If @a len is 0, or greater than the length of the string
+ * starting at @a pos, the string is just truncated at @a pos.
+ */
+ void remove(lenpos_t pos, lenpos_t len) {
+ if (len < 1 || pos + len >= sLen) {
+ s[pos] = '\0';
+ sLen = pos;
+ } else {
+ for (lenpos_t i = pos; i < sLen - len + 1; i++) {
+ s[i] = s[i+len];
+ }
+ sLen -= len;
+ }
+ }
+ SString &change(lenpos_t pos, char ch) {
+ if (pos >= sLen) { // character changed must be in string bounds
+ return *this;
+ }
+ *(s + pos) = ch;
+ return *this;
+ }
+ /** Read an integral numeric value from the string. */
int value() const {
if (s)
return atoi(s);
else
return 0;
}
- void substitute(char find, char replace) {
+ int search(const char *sFind, lenpos_t start=0) const {
+ if (start < sLen) {
+ const char *sFound = strstr(s + start, sFind);
+ if (sFound) {
+ return sFound - s;
+ }
+ }
+ return -1;
+ }
+ bool contains(const char *sFind) {
+ return search(sFind) >= 0;
+ }
+ int substitute(char chFind, char chReplace) {
+ int c = 0;
char *t = s;
while (t) {
- t = strchr(t, find);
+ t = strchr(t, chFind);
if (t) {
- *t = replace;
+ *t = chReplace;
t++;
+ c++;
}
}
+ return c;
+ }
+ int substitute(const char *sFind, const char *sReplace) {
+ int c = 0;
+ lenpos_t lenFind = strlen(sFind);
+ lenpos_t lenReplace = strlen(sReplace);
+ int posFound = search(sFind);
+ while (posFound >= 0) {
+ remove(posFound, lenFind);
+ insert(posFound, sReplace, lenReplace);
+ posFound = search(sFind, posFound + lenReplace);
+ c++;
+ }
+ return c;
+ }
+ int remove(const char *sFind) {
+ return substitute(sFind, "");
+ }
+ /**
+ * Duplicate a C string.
+ * Allocate memory of the given size, or big enough to fit the string if length isn't given;
+ * then copy the given string in the allocated memory.
+ * @return the pointer to the new string
+ */
+ static char *StringAllocate(
+ const char *s, ///< The string to duplicate
+ lenpos_t len=measure_length) ///< The length of memory to allocate. Optional.
+ {
+ if (s == 0) {
+ return 0;
+ }
+ if (len == measure_length) {
+ len = strlen(s);
+ }
+ char *sNew = new char[len + 1];
+ if (sNew) {
+ memcpy(sNew, s, len);
+ sNew[len] = '\0';
+ }
+ return sNew;
}
};
+/**
+ * Duplicate a C string.
+ * Allocate memory of the given size, or big enough to fit the string if length isn't given;
+ * then copy the given string in the allocated memory.
+ * @return the pointer to the new string
+ */
+inline char *StringDup(
+ const char *s, ///< The string to duplicate
+ SString::lenpos_t len=SString::measure_length) ///< The length of memory to allocate. Optional.
+{
+ return SString::StringAllocate(s, len);
+}
+
#endif
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