#include "base.h"

// returns length of char buffer (without \0)
uint32 cptr_length(char* str){
    uint32 len=0;
    while(*(str++)) len++;
    return len;
}

// allocates new char[] and copies src there
char* cptr_copy(char* src){
    uint32 len=cptr_length(src)+1;
    char* dst=malloc(len);
    while(len--!=0)
        dst[len]=src[len];
    return dst;
}

// compares two char buffers, NullPtr-friendly
bool cptr_compare(char* key0, char* key1){
    if(!key0) return key1 ? false : true;
    if(!key1) return false;
    while(*key0&&*key1)
        if(*key0++ != *key1++) 
            return false;
    return true;
}

// multiplies char n times
char* char_multiply(char c, uint32 n){
    char* rez=malloc(n+1);
    rez[n]=0;
    while(n--!=0)
        rez[n]=c;
    return rez;
}

bool cptr_startsWith(char* ptr, char* fragment){
    for(char cs=*ptr, cf=*fragment; cf; cs=*++ptr, cf=*++fragment)
        if(cs!=cf) return false;
    return true;
}

bool cptr_endsWith(char* ptr, char* fragment){
    ptr+=cptr_length(ptr)-cptr_length(fragment);
    for(char cs=*ptr, cf=*fragment; cf; cs=*++ptr, cf=*++fragment)
        if(cs!=cf) return false;
    return true;
}