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