55 lines
1.8 KiB
C++
55 lines
1.8 KiB
C++
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#include <string.h>
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#include "dynarr.hpp"
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typedef void (* PFC)(int,char *);
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extern void default_error(int,char *);
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PFC dynarr_handler = default_error; // set handler to default
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int dynarr::resize(unsigned newsize) // change the size of the storage block
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{ // this will always be an increase
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char *p = new char[newsize*es];
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if (!p)
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return -1; // signal failure
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memset(p,'\0',newsize*es); // set all to zero
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memmove(p,body,elems*es); // then copy in existing elements
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delete body; // zap the old storage
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body = p; // and point to new
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elems = newsize; // adjust the element count
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return 0;
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}
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dynarr::dynarr(unsigned n,unsigned elemsize)
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{
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elems = n;
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es = elemsize;
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dummy = new char[es]; // used on allocation error
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if (!dummy)
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goto err1;
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body = new char[es*elems]; // allocate requested storage (default one)
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if (!body) {
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err1:
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dynarr_handler(ENOMEM,"dynarr - not enough memory");
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return; // call whatever error handler is installed
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}
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memset(body,'\0',es*elems); // initialize storage to zero
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}
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char *dynarr::access(unsigned i)
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{
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if (i >= elems) { // requested index outside current storage
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if (resize(i+1)) { // elems is 1 > index
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dynarr_handler(ENOMEM,"dynarr - not enough memory");
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return dummy; // give access to something safe
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}
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}
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return body+i*es; // pointer to appropriate block
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}
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PFC set_dynarr_handler(PFC handler)
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{ // function to set error handling
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PFC local = dynarr_handler;
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dynarr_handler = handler;
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return local;
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}
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