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#include <string.h>
#include "_safety.h"
/** search for substring **/
char * strstr(const char *s1, const char *s2)
{
size_t l1 = 0;
size_t l2 = 0;
char *p = (char*)s1;
SIGNAL_SAFE(0);
ASSERT_NONNULL(s1);
ASSERT_NONNULL(s2);
/* no modifcation, overlap is OK */
DANGEROUS_READ(s1, -1);
l1 = strlen(s1);
DANGER_OVER();
DANGEROUS_READ(s2, -1);
l2 = strlen(s2);
DANGER_OVER();
for (p = (char*)s1; p < s1 + l1 - l2; p = strchr(p + 1, *s2)) {
if (p == NULL || strncmp(p, s2, l2) == 0) {
break;
}
}
/*
RETURN_FAILURE(CONSTANT(NULL));
RETURN_SUCCESS(a pointer to the located string);
*/
return p;
}
CHECK_2(char *, 0, strstr, const char *, const char *)
/***
finds the first occurrence of the string ARGUMENT(s2) in the string
ARGUMENT(s1). Specifying the empty string for ARGUMENT(s2) matches the first
character of ARGUMENT(s1).
***/
/*
STDC(1)
*/
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