/****f* FUNC/simplestring_addn
* NAME
* simplestring_addn
* SYNOPSIS
* void simplestring_addn(simplestring* string, const char* add, int add_len)
* FUNCTION
* copies n characters from source to target string
* INPUTS
* target - target string
* source - source string
* add_len - number of characters to copy
* RESULT
* void
* NOTES
* SEE ALSO
* simplestring_add ()
* SOURCE
*/
void simplestring_addn(simplestring* target, const char* source, int add_len) {
if(target && source) {
if(!target->str) {
simplestring_init_str(target);
}
if(target->len + add_len + 1 > target->size) {
/* newsize is current length + new length */
int newsize = target->len + add_len + 1;
int incr = target->size * 2;
/* align to SIMPLESTRING_INCR increments */
newsize = newsize - (newsize % incr) + incr;
target->str = (char*)realloc(target->str, newsize);
target->size = target->str ? newsize : 0;
}
if(target->str) {
if(add_len) {
memcpy(target->str + target->len, source, add_len);
}
target->len += add_len;
target->str[target->len] = 0; /* null terminate */
}
}
}
/****f* FUNC/simplestring_addn
* NAME
* simplestring_addn
* SYNOPSIS
* void simplestring_addn(simplestring* string, const char* add, int add_len)
* FUNCTION
* copies n characters from source to target string
* INPUTS
* target - target string
* source - source string
* add_len - number of characters to copy
* RESULT
* void
* NOTES
* SEE ALSO
* simplestring_add ()
* SOURCE
*/
void simplestring_addn(simplestring* target, const char* source, size_t add_len) {
size_t newsize = target->size, incr = 0;
if(target && source) {
if(!target->str) {
simplestring_init_str(target);
}
if((INT_MAX - add_len) < target->len || (INT_MAX - add_len - 1) < target->len) {
/* check for overflows, if there's a potential overflow do nothing */
return;
}
if(target->len + add_len + 1 > target->size) {
/* newsize is current length + new length */
newsize = target->len + add_len + 1;
incr = target->size * 2;
/* align to SIMPLESTRING_INCR increments */
if (incr) {
newsize = newsize - (newsize % incr) + incr;
}
if(newsize < (target->len + add_len + 1)) {
/* some kind of overflow happened */
return;
}
target->str = (char*)erealloc(target->str, newsize);
target->size = target->str ? newsize : 0;
}
if(target->str) {
if(add_len) {
memcpy(target->str + target->len, source, add_len);
}
target->len += add_len;
target->str[target->len] = 0; /* null terminate */
}
}
}
