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memory: memcnt and strcnt.

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This commit is contained in:
Scott Prager 2014-09-04 12:37:16 -04:00
parent 951d00a492
commit c6271f5767
1 changed files with 37 additions and 0 deletions
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37
src/nvim/memory.c
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@ -234,6 +234,43 @@ void memchrsub(void *data, char c, char x, size_t len)
}
}
/// Counts the number of occurrences of `c` in `str`.
///
/// @warning Unsafe if `c == NUL`.
///
/// @param str Pointer to the string to search.
/// @param c The byte to search for.
/// @returns the number of occurrences of `c` in `str`.
size_t strcnt(const char *str, char c, size_t len)
FUNC_ATTR_NONNULL_ALL FUNC_ATTR_PURE
{
assert(c != 0);
size_t cnt = 0;
while ((str = strchr(str, c))) {
cnt++;
str++; // Skip the instance of c.
}
return cnt;
}
/// Counts the number of occurrences of byte `c` in `data[len]`.
///
/// @param data Pointer to the data to search.
/// @param c The byte to search for.
/// @param len The length of `data`.
/// @returns the number of occurrences of `c` in `data[len]`.
size_t memcnt(const void *data, char c, size_t len)
FUNC_ATTR_NONNULL_ALL FUNC_ATTR_PURE
{
size_t cnt = 0;
const char *ptr = data, *end = ptr + len;
while ((ptr = memchr(ptr, c, (size_t)(end - ptr))) != NULL) {
cnt++;
ptr++; // Skip the instance of c.
}
return cnt;
}
/// The xstpcpy() function shall copy the string pointed to by src (including
/// the terminating NUL character) into the array pointed to by dst.
///