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Add strcspn implementation #101

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Add strcspn implementation #101

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20 changes: 20 additions & 0 deletions libc/string.h
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Original file line number Diff line number Diff line change
Expand Up @@ -216,4 +216,24 @@ strpbrk(const char *s1, const char *s2)
return (NULL);
}

// From Bionic:
size_t
strcspn(const char *s1, const char *s2)
{
const char *p, *spanp;
char c, sc;
/*
* Stop as soon as we find any character from s2. Note that there
* must be a NULL in s2; it suffices to stop when we find that, too.
*/
for (p = s1;;) {
c = *p++;
spanp = s2;
do {
if ((sc = *spanp++) == c)
return (p - 1 - s1);
} while (sc != 0);
}
/* NOTREACHED */
}
#endif // ELVM_LIBC_STRING_H_