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#include "utils.h"

char* copy_string(const char* str, size_t strln) {
    char* s=malloc(sizeof(char)*(strln+1));
    strncpy(s, str, strln);
    *(s+strln) = '\0';
    return s;
}

size_t safe_strlen(const char* str) {
    if (str) {
        return strlen(str);
    }
    return 0;
}

void safe_free(void* p) {
    if (p) {
        free(p);
    }
}

void Buffer_init(struct Buffer* this) {
    this->buffer = malloc(256);
    this->bufferUsed = 0;
    this->bufferAllocated = 256;
}

void Buffer_destroyMembers(struct Buffer* this) {
    free(this->buffer);
}

size_t Buffer_append(struct Buffer* this, const void* data, size_t dataSize) {
    size_t newSize = this->bufferUsed + dataSize;
    if (newSize > this->bufferAllocated) {
        size_t newAllocSize = this->bufferAllocated + dataSize;
        char* newBuffer = malloc(newAllocSize);
        memcpy(newBuffer, this->buffer, this->bufferUsed);
        free(this->buffer);
        this->buffer = newBuffer;
        this->bufferAllocated = newAllocSize;
        if (!newBuffer) {
            return -1;
        }
    }
    memcpy(this->buffer+this->bufferUsed, data, dataSize);
    this->bufferUsed = this->bufferUsed + dataSize;
    return dataSize;
}