1 /* $NetBSD: strdup.c,v 1.6 2022/10/09 21:41:03 christos Exp $ */
2
3 #include <config.h>
4
5 #include <ntp_assert.h>
6 #include <string.h>
7 #include "ntp_malloc.h"
8 #include "l_stdlib.h"
9
10 #define STRDUP_EMPTY_UNIT
11
12 #ifndef HAVE_STRDUP
13 # undef STRDUP_EMPTY_UNIT
14 char *strdup(const char *s);
15 char *
strdup(const char * s)16 strdup(
17 const char *s
18 )
19 {
20 size_t octets;
21 char * cp;
22
23 REQUIRE(s);
24 octets = strlen(s) + 1;
25 if ((cp = malloc(octets)) == NULL)
26 return NULL;
27 memcpy(cp, s, octets);
28
29 return cp;
30 }
31 #endif
32
33 #ifndef HAVE_MEMCHR
34 # undef STRDUP_EMPTY_UNIT
memchr(const void * s,int c,size_t n)35 void *memchr(const void *s, int c, size_t n)
36 {
37 const unsigned char *p = s;
38 while (n && *p != c) {
39 --n;
40 ++p;
41 }
42 return n ? (char*)p : NULL;
43 }
44 #endif
45
46 #ifndef HAVE_STRNLEN
47 # undef STRDUP_EMPTY_UNIT
strnlen(const char * s,size_t n)48 size_t strnlen(const char *s, size_t n)
49 {
50 const char *e = memchr(s, 0, n);
51 return e ? (size_t)(e - s) : n;
52 }
53 #endif
54
55 #ifdef STRDUP_EMPTY_UNIT
56 int strdup_c_nonempty_compilation_unit;
57 #endif
58