43 lines
1.2 KiB
C
43 lines
1.2 KiB
C
#include "StringFragment.h"
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//copies <length> characters from <ptr+offset> to new StringFragment (adding '\0' at the end)
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StringFragment StringFragment_extract(StringFragment str){
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if(str.length==0) return stringNull;
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StringFragment extr={
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.offset=0,
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.length=str.length,
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.ptr=malloc(str.length+1)
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};
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str.ptr+=str.offset;
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for(uint32 i=0; i<str.length; i++)
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extr.ptr[i]=str.ptr[i];
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extr.ptr[str.length]='\0';
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return extr;
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}
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//compares two strings, NullPtr-friendly
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bool StringFragment_compare(StringFragment str0, StringFragment str1){
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if(str0.length!=str1.length) return false;
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if(!str0.ptr) return str1.ptr ? false : true;
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else if(!str1.ptr) return false;
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str0.ptr+=str0.offset;
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str1.ptr+=str1.offset;
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while(str0.length-->0)
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if(*str0.ptr++ != *str1.ptr++)
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return false;
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return true;
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}
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//creates new StringFragment which is reversed variant of <s>
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StringFragment StringFragment_reverse(StringFragment s){
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if(s.length==0) return s;
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StringFragment r={
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.offset=0,
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.length=s.length,
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.ptr=malloc(s.length)
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};
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for(uint32 i=0; i<s.length; i++)
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r.ptr[i+s.offset]=s.ptr[s.length-i-1];
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return r;
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}
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