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#include "fmt.h"
#include "textcode.h"
#include "scan.h"
size_t scan_ldapescape(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) {
if (s[i]=='\\') {
unsigned char c;
int j=scan_fromhex(s[i+1]);
if (j<0) break;
c=j<<4;
j=scan_fromhex(s[i+2]);
if (j<0) break;
if (dest) dest[written]=c|j;
i+=2;
} else {
if (dest) dest[written]=s[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() {
size_t dl;
char buf[100];
assert(scan_ldapescape("test\\n\");",buf,&dl)==4 && dl==4 && !memcmp(buf,"test",4));
/* check hex escaping */
assert(scan_ldapescape("test\\0afoo",buf,&dl)==10 && dl==8 && !memcmp(buf,"test\nfoo",8));
/* check that short sequences are rejected */
assert(scan_ldapescape("test\\ax",buf,&dl)==4 && dl==4 && !memcmp(buf,"test",4));
}
#endif
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