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tools/nolibc/string: add strncpy() and strlcpy()

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These are minimal variants. strncpy() always fills the destination for
<size> chars, while strlcpy() copies no more than <size> including the
zero and returns the source's length. The respective sizes on various
archs are:

  strncpy(): x86:0x1f mips:0x30 arm:0x20
  strlcpy(): x86:0x17 mips:0x34 arm:0x1a

Signed-off-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Willy Tarreau 2022-02-07 17:23:42 +01:00 • committed by Paul E. McKenney
parent d76232ff8b
commit b312eb0b87
1 changed files with 28 additions and 0 deletions
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28
tools/include/nolibc/string.h
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@ -121,6 +121,34 @@ size_t nolibc_strlen(const char *str)
nolibc_strlen((str)); \
})
static __attribute__((unused))
size_t strlcpy(char *dst, const char *src, size_t size)
{
size_t len;
char c;
for (len = 0;;) {
c = src[len];
if (len < size)
dst[len] = c;
if (!c)
break;
len++;
}
return len;
}
static __attribute__((unused))
char *strncpy(char *dst, const char *src, size_t size)
{
size_t len;
for (len = 0; len < size; len++)
if ((dst[len] = *src))
src++;
return dst;
}
static __attribute__((unused))
char *strrchr(const char *s, int c)
{