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17 lines
573 B
C
17 lines
573 B
C
#include "byte.h"
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/* byte_rchr returns the largest integer i between 0 and len-1 inclusive
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* such that one[i] equals needle, or len if not found. */
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size_t byte_rchr(const void* haystack,size_t len,char needle) {
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register char c=needle;
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register const char* s=haystack;
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register const char* t=s+len;
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for (;;) {
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--t; if (s>t) break; if (*t==c) return (size_t)(t-s);
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--t; if (s>t) break; if (*t==c) return (size_t)(t-s);
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--t; if (s>t) break; if (*t==c) return (size_t)(t-s);
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--t; if (s>t) break; if (*t==c) return (size_t)(t-s);
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}
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return len;
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}
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