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#include "byte.h"
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/* str_diff returns negative, 0, or positive, depending on whether the
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* string a[0], a[1], ..., a[n]=='\0' is lexicographically smaller than,
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* equal to, or greater than the string b[0], b[1], ..., b[m-1]=='\0'.
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* When the strings are different, str_diff does not read bytes past the
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* first difference. */
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int str_diffn(const char* a, const char* b, unsigned long limit) {
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register const char* s=a;
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register const char* t=b;
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register const char* u=t+limit;
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register int j;
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j=0;
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for (;;) {
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if (t>=u) break; if ((j=(*s-*t))) break; if (!*t) break; ++s; ++t;
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if (t>=u) break; if ((j=(*s-*t))) break; if (!*t) break; ++s; ++t;
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if (t>=u) break; if ((j=(*s-*t))) break; if (!*t) break; ++s; ++t;
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if (t>=u) break; if ((j=(*s-*t))) break; if (!*t) break; ++s; ++t;
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}
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return j;
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}
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