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tools/nolibc/string: Implement strdup()
and strndup()
These functions are currently only available on architectures that have my_syscall6() macro implemented. Since these functions use malloc(), malloc() uses mmap(), mmap() depends on my_syscall6() macro. On architectures that don't support my_syscall6(), these function will always return NULL with errno set to ENOSYS. Acked-by: Willy Tarreau <w@1wt.eu> Signed-off-by: Ammar Faizi <ammarfaizi2@gnuweeb.org> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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@ -9,6 +9,8 @@
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#include "std.h"
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static void *malloc(size_t len);
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/*
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* As much as possible, please keep functions alphabetically sorted.
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*/
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@ -156,6 +158,36 @@ size_t strnlen(const char *str, size_t maxlen)
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return len;
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}
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static __attribute__((unused))
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char *strdup(const char *str)
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{
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size_t len;
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char *ret;
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len = strlen(str);
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ret = malloc(len + 1);
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if (__builtin_expect(ret != NULL, 1))
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memcpy(ret, str, len + 1);
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return ret;
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}
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static __attribute__((unused))
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char *strndup(const char *str, size_t maxlen)
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{
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size_t len;
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char *ret;
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len = strnlen(str, maxlen);
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ret = malloc(len + 1);
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if (__builtin_expect(ret != NULL, 1)) {
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memcpy(ret, str, len);
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ret[len] = '\0';
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}
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return ret;
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}
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static __attribute__((unused))
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size_t strlcat(char *dst, const char *src, size_t size)
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{
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