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#include "scan.h"
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/* parse a netstring, input buffer is in (len bytes).
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* if parsing is successful:
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* *dest points to string and *slen is size of string
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* return number of bytes parsed
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* else
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* return 0
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* Note: *dest will point inside the input buffer!
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*/
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size_t scan_netstring(const char* in,size_t len,char** dest,size_t* slen) {
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// [len]":"[string]","
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// 3:foo,3:bar,4:fini,
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unsigned long l;
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size_t n=scan_ulongn(in,len,&l);
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if (!n || /* did not start with a number */
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n+2+l<l || /* overflow */
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n+2+l>len || /* longer than we have input data */
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in[n]!=':' || /* syntax error */
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in[n+l+1]!=',')
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return 0;
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*dest=(char*)in+n+1;
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*slen=l;
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return n+2+l;
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}
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#ifdef UNITTEST
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#include <assert.h>
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#include "scan_ulongn.c"
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int main() {
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char buf[]="12:hello world!,";
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char* s;
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size_t l;
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const char* orig;
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assert(scan_netstring(buf,16,&s,&l)==16 && s==buf+3 && l==12);
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orig="3:foo,"; assert(scan_netstring(orig,6,&s,&l)==6 && s==orig+2 && l==3);
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orig="4294967295:foo,"; assert(scan_netstring(orig,15,&s,&l)==0);
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orig="18446744073709551615:foo,"; assert(scan_netstring(orig,25,&s,&l)==0);
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}
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#endif
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