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#include "fmt.h"
#include "textcode.h"
#include "scan.h"
size_t scan_hexdump(const char *src,char *dest,size_t *destlen) {
register const unsigned char* s=(const unsigned char*) src;
size_t written=0,i;
for (i=0; s[i]; ++i) {
int j=scan_fromhex(s[i]);
unsigned char k;
if (j<0) break;
k=j<<4;
j=scan_fromhex(s[i+1]);
if (j<0) break;
if (dest) dest[written]=k|j;
++i;
++written;
}
if (destlen) *destlen=written;
return i;
}
#ifdef UNITTEST
#include <assert.h>
#include <string.h>
#undef UNITTEST
#include <scan/scan_fromhex.c>
int main() {
char buf[100];
size_t l;
memset(buf,0,sizeof(buf));
assert(scan_hexdump("0123456789abcdef",buf,&l)==16 && l==8 && !memcmp(buf,"\x01\x23\x45\x67\x89\xab\xcd\xef",9));
memset(buf,'?',sizeof(buf));
assert(scan_hexdump("0",buf,&l)==0 && l==0 && buf[0]=='?');
}
#endif
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