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RRTcodebaseC

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* If you do not know how larget the string will be, give 0 here.
* @return None.
*/
void dc_strbuilder_init(dc_strbuilder_t* strbuilder, int init_bytes)
{
if (strbuilder==NULL) {
return;
}
strbuilder->allocated = DC_MAX(init_bytes, 128); /* use a small default minimum, we may use _many_ of these objects at the same time */
strbuilder->buf = malloc(strbuilder->allocated);
if (strbuilder->buf==NULL) {
exit(38);
}
strbuilder->buf[0] = 0;
strbuilder->free = strbuilder->allocated - 1 /*the nullbyte! */;
strbuilder->eos = strbuilder->buf;
}
/**
* Add a string to the end of the current string in a string-builder-object.
* The internal buffer is reallocated as needed.
* If reallocation fails, the program halts.
*
* @param strbuilder The object to initialze. Must be initialized with
* dc_strbuilder_init().
* @param text Null-terminated string to add to the end of the string-builder-string.
* @return Returns a pointer to the copy of the given text.
* The returned pointer is a pointer inside dc_strbuilder_t::buf and MUST NOT
* be freed. If the string-builder was empty before, the returned
* pointer is equal to dc_strbuilder_t::buf.
* If the given text is NULL, NULL is returned and the string-builder-object is not modified.
*/
char* dc_strbuilder_cat(dc_strbuilder_t* strbuilder, const char* text)
{
// this function MUST NOT call logging functions as it is used to output the log
if (strbuilder==NULL || text==NULL) {
return NULL;
}
int len = strlen(text);
if (len > strbuilder->free) {
int add_bytes = DC_MAX(len, strbuilder->allocated);
int old_offset = (int)(strbuilder->eos - strbuilder->buf);
strbuilder->allocated = strbuilder->allocated + add_bytes;
strbuilder->buf = realloc(strbuilder->buf, strbuilder->allocated+add_bytes);
if (strbuilder->buf==NULL) {
exit(39);
}
strbuilder->free = strbuilder->free + add_bytes;
strbuilder->eos = strbuilder->buf + old_offset;
}
char* ret = strbuilder->eos;
strcpy(strbuilder->eos, text);
strbuilder->eos += len;
strbuilder->free -= len;
return ret;
}
/**
* Add a formatted string to a string-builder-object.
* This function is similar to dc_strbuilder_cat() but allows the same
* formatting options as eg. printf()
*
* @param strbuilder The object to initialze. Must be initialized with
* dc_strbuilder_init().
* @param format The formatting string to add to the string-builder-object.
* This parameter may be followed by data to be inserted into the
* formatting string, see eg. printf()
* @return None.
*/
void dc_strbuilder_catf(dc_strbuilder_t* strbuilder, const char* format, ...)
{
char testbuf[1];
char* buf = NULL;
int char_cnt_without_zero = 0;
va_list argp;
va_list argp_copy;
va_start(argp, format);
va_copy(argp_copy, argp);
char_cnt_without_zero = vsnprintf(testbuf, 0, format, argp);
va_end(argp);
if (char_cnt_without_zero < 0) {
va_end(argp_copy);
dc_strbuilder_cat(strbuilder, "ErrFmt");
return;
}