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#include <string.h>
#include "_assert.h"
/** count matching characters **/
size_t strspn(const char *s1, const char *s2)
{
size_t i = 0;
ASSERT_NONNULL(s1);
ASSERT_NONNULL(s2);
for (i = 0; i < strlen (s1); i++) {
if (strchr(s2, s1[i]) == NULL) {
break;
}
}
return i;
}
/***
computes the length of the maximum initial segment of the ARGUMENT(s1) made
up of characters from ARGUMENT(s2).
***/
/*
RETURN_ALWAYS(the number of matching characters);
STDC(1)
*/
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