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diff --git a/include/string.h b/include/string.h
--- a/include/string.h
+++ b/include/string.h
@@ -154,6 +154,34 @@
int timingsafe_bcmp(const void *, const void *, size_t);
int timingsafe_memcmp(const void *, const void *, size_t);
+
+#if __has_builtin(__builtin_alloca)
+#define strdupa(_Str) (__extension__({ \
+ const char *_Str1; \
+ size_t _Len; \
+ char *_Copy; \
+ \
+ _Str1 = (_Str); \
+ _Len = strlen(_Str1) + 1; \
+ _Copy = (char *)__builtin_alloca(_Len); \
+ memcpy(_Copy, _Str1, _Len); \
+ _Copy; \
+}))
+
+#define strndupa(_Str, _Maxlen) (__extension__({ \
+ const char *_Str1; \
+ char *_Copy; \
+ size_t _Len; \
+ \
+ _Str1 = (_Str); \
+ _Len = strnlen((_Str1), (_Maxlen)); \
+ _Copy = __builtin_alloca(_Len + 1); \
+ (void)memcpy(_Copy, _Str1, _Len); \
+ _Copy[_Len] = '\0'; \
+ _Copy; \
+}))
+#endif
+
#endif /* __BSD_VISIBLE */
#if __POSIX_VISIBLE >= 200112 || defined(_XLOCALE_H_)
diff --git a/lib/libc/string/Makefile.inc b/lib/libc/string/Makefile.inc
--- a/lib/libc/string/Makefile.inc
+++ b/lib/libc/string/Makefile.inc
@@ -7,26 +7,93 @@
CFLAGS+= -I${LIBC_SRCTOP}/locale
# machine-independent string sources
-MISRCS+=bcmp.c bcopy.c bzero.c explicit_bzero.c \
- ffs.c ffsl.c ffsll.c fls.c flsl.c flsll.c \
- memccpy.c memchr.c memrchr.c memcmp.c \
- memcpy.c memmem.c memmove.c mempcpy.c memset.c memset_s.c \
+MISRCS+=bcmp.c \
+ bcopy.c \
+ bzero.c \
+ explicit_bzero.c \
+ ffs.c \
+ ffsl.c \
+ ffsll.c \
+ fls.c \
+ flsl.c \
+ flsll.c \
+ memccpy.c \
+ memchr.c \
+ memrchr.c \
+ memcmp.c \
+ memcpy.c \
+ memmem.c \
+ memmove.c \
+ mempcpy.c \
+ memset.c \
+ memset_s.c \
memset_explicit.c \
- stpcpy.c stpncpy.c strcasecmp.c \
- strcat.c strcasestr.c strchr.c strchrnul.c strcmp.c strcoll.c strcpy.c\
- strcspn.c strdup.c strerror.c strlcat.c strlcpy.c strlen.c strmode.c \
- strncat.c strncmp.c strncpy.c strndup.c strnlen.c strnstr.c \
- strpbrk.c strrchr.c strsep.c strsignal.c strspn.c strstr.c strtok.c \
- strverscmp.c strxfrm.c swab.c \
+ stpcpy.c \
+ stpncpy.c \
+ strcasecmp.c \
+ strcat.c \
+ strcasestr.c \
+ strchr.c \
+ strchrnul.c \
+ strcmp.c \
+ strcoll.c \
+ strcpy.c\
+ strcspn.c \
+ strdup.c \
+ strerror.c \
+ strlcat.c \
+ strlcpy.c \
+ strlen.c \
+ strmode.c \
+ strncat.c \
+ strncmp.c \
+ strncpy.c \
+ strndup.c \
+ strnlen.c \
+ strnstr.c \
+ strpbrk.c \
+ strrchr.c \
+ strsep.c \
+ strsignal.c \
+ strspn.c \
+ strstr.c \
+ strtok.c \
+ strverscmp.c \
+ strxfrm.c \
+ swab.c \
timingsafe_bcmp.c \
timingsafe_memcmp.c \
- wcpcpy.c wcpncpy.c wcscasecmp.c wcscat.c \
- wcschr.c wcscmp.c wcscoll.c wcscpy.c wcscspn.c wcsdup.c \
- wcslcat.c wcslcpy.c wcslen.c wcsncasecmp.c wcsncat.c wcsncmp.c \
- wcsncpy.c wcsnlen.c wcspbrk.c \
- wcsrchr.c wcsspn.c wcsstr.c wcstok.c wcswidth.c wcsxfrm.c wmemchr.c \
+ wcpcpy.c \
+ wcpncpy.c \
+ wcscasecmp.c \
+ wcscat.c \
+ wcschr.c \
+ wcscmp.c \
+ wcscoll.c \
+ wcscpy.c \
+ wcscspn.c \
+ wcsdup.c \
+ wcslcat.c \
+ wcslcpy.c \
+ wcslen.c \
+ wcsncasecmp.c \
+ wcsncat.c \
+ wcsncmp.c \
+ wcsncpy.c \
+ wcsnlen.c \
+ wcspbrk.c \
+ wcsrchr.c \
+ wcsspn.c \
+ wcsstr.c \
+ wcstok.c \
+ wcswidth.c \
+ wcsxfrm.c \
+ wmemchr.c \
wmemcmp.c \
- wmemcpy.c wmemmove.c wmempcpy.c wmemset.c
+ wmemcpy.c \
+ wmemmove.c \
+ wmempcpy.c \
+ wmemset.c
SYM_MAPS+= ${LIBC_SRCTOP}/string/Symbol.map
@@ -45,14 +112,45 @@
.sinclude "${LIBC_SRCTOP}/${LIBC_ARCH}/string/Makefile.inc"
.endif
-MAN+= bcmp.3 bcopy.3 bstring.3 bzero.3 ffs.3 index.3 memccpy.3 memchr.3 \
- memcmp.3 memcpy.3 memmem.3 memmove.3 memset.3 strcasecmp.3 strcat.3 \
- strchr.3 strcmp.3 strcoll.3 strcpy.3 strdup.3 strerror.3 \
- string.3 strlcpy.3 strlen.3 strmode.3 strpbrk.3 strsep.3 \
- strspn.3 strstr.3 strtok.3 strverscmp.3 strxfrm.3 swab.3 \
+MAN+= bcmp.3 \
+ bcopy.3 \
+ bstring.3 \
+ bzero.3 \
+ ffs.3 \
+ index.3 \
+ memccpy.3 \
+ memchr.3 \
+ memcmp.3 \
+ memcpy.3 \
+ memmem.3 \
+ memmove.3 \
+ memset.3 \
+ strcasecmp.3 \
+ strcat.3 \
+ strchr.3 \
+ strcmp.3 \
+ strcoll.3 \
+ strcpy.3 \
+ strdup.3 \
+ strerror.3 \
+ string.3 \
+ strlcpy.3 \
+ strlen.3 \
+ strmode.3 \
+ strpbrk.3 \
+ strsep.3 \
+ strspn.3 \
+ strstr.3 \
+ strtok.3 \
+ strverscmp.3 \
+ strxfrm.3 \
+ swab.3 \
timingsafe_bcmp.3 \
- wcscoll.3 wcstok.3 \
- wcswidth.3 wcsxfrm.3 wmemchr.3
+ wcscoll.3 \
+ wcstok.3 \
+ wcswidth.3 \
+ wcsxfrm.3 \
+ wmemchr.3
MLINKS+=bzero.3 explicit_bzero.3
MLINKS+=ffs.3 ffsl.3 \
@@ -76,7 +174,9 @@
MLINKS+=strcpy.3 stpcpy.3 \
strcpy.3 stpncpy.3 \
strcpy.3 strncpy.3
-MLINKS+=strdup.3 strndup.3
+MLINKS+=strdup.3 strndup.3 \
+ strdup.3 strdupa.3 \
+ strdup.3 strndupa.3
MLINKS+=strerror.3 perror.3 \
strerror.3 strerror_l.3 \
strerror.3 strerror_r.3 \
diff --git a/lib/libc/string/strdup.3 b/lib/libc/string/strdup.3
--- a/lib/libc/string/strdup.3
+++ b/lib/libc/string/strdup.3
@@ -30,7 +30,9 @@
.Os
.Sh NAME
.Nm strdup ,
-.Nm strndup
+.Nm strdupa ,
+.Nm strndup ,
+.Nm strndupa
.Nd save a copy of a string
.Sh LIBRARY
.Lb libc
@@ -39,7 +41,11 @@
.Ft char *
.Fn strdup "const char *str"
.Ft char *
+.Fn strdupa "const char *str"
+.Ft char *
.Fn strndup "const char *str" "size_t len"
+.Ft char *
+.Fn strndupa "const char *str" "size_t len"
.Sh DESCRIPTION
The
.Fn strdup
@@ -63,6 +69,19 @@
always
.Dv NUL
terminating the copied string.
+.Pp
+The
+.Fn strdupa
+function is identical to
+.Fn strdup
+but allocates the memory with
+.Xr alloca 3 .
+Similarly, the
+.Fn strndupa
+function is identical to
+.Fn strndup ,
+but allocates the memory with
+.Xr alloca 3 .
.Sh RETURN VALUES
If insufficient memory is available, NULL is returned and
.Va errno
@@ -72,6 +91,7 @@
.Fn strdup
family of functions return a pointer to the copied string.
.Sh SEE ALSO
+.Xr alloca 3 ,
.Xr free 3 ,
.Xr malloc 3 ,
.Xr wcsdup 3
@@ -84,6 +104,12 @@
.Fn strndup
function is specified by
.St -p1003.1-2008 .
+The
+.Fn strdupa
+and
+.Fn strndupa
+functions are extensions,
+taken from glibc.
.Sh HISTORY
The
.Fn strdup
@@ -93,3 +119,9 @@
.Fn strndup
function was added in
.Fx 7.2 .
+The
+.Fn strdupa
+and
+.Fn strndupa
+functions were added in
+.Fx 15.1 .

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