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21 lines
766 B
C
21 lines
766 B
C
#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_diff(const char* a, const char* b) {
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register const unsigned char* s=(const unsigned char*)a;
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register const unsigned char* t=(const unsigned char*)b;
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register int j;
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j=0;
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for (;;) {
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if ((j=(*s-*t))) break; if (!*t) break; ++s; ++t;
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if ((j=(*s-*t))) break; if (!*t) break; ++s; ++t;
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if ((j=(*s-*t))) break; if (!*t) break; ++s; ++t;
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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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