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