Merge "libc: swap memrchr to llvm-libc for most arches" into main
diff --git a/libc/Android.bp b/libc/Android.bp
index a8beb05..3c5c9f1 100644
--- a/libc/Android.bp
+++ b/libc/Android.bp
@@ -623,7 +623,6 @@
arm: {
srcs: [
"upstream-openbsd/lib/libc/string/memchr.c",
- "upstream-openbsd/lib/libc/string/memrchr.c",
"upstream-openbsd/lib/libc/string/stpncpy.c",
"upstream-openbsd/lib/libc/string/strncat.c",
"upstream-openbsd/lib/libc/string/strncmp.c",
@@ -640,7 +639,6 @@
},
riscv64: {
srcs: [
- "upstream-openbsd/lib/libc/string/memrchr.c",
"upstream-openbsd/lib/libc/string/stpncpy.c",
],
},
@@ -1161,7 +1159,6 @@
"arch-x86/string/sse2-memchr-atom.S",
"arch-x86/string/sse2-memmove-slm.S",
- "arch-x86/string/sse2-memrchr-atom.S",
"arch-x86/string/sse2-memset-slm.S",
"arch-x86/string/sse2-stpcpy-slm.S",
"arch-x86/string/sse2-stpncpy-slm.S",
diff --git a/libc/NOTICE b/libc/NOTICE
index 1fa036a..bca4891 100644
--- a/libc/NOTICE
+++ b/libc/NOTICE
@@ -3585,22 +3585,6 @@
-------------------------------------------------------------------
-Copyright (c) 2007 Todd C. Miller <millert@openbsd.org>
-
-Permission to use, copy, modify, and distribute this software for any
-purpose with or without fee is hereby granted, provided that the above
-copyright notice and this permission notice appear in all copies.
-
-THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
-WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
-ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
-WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
-ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
-OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-
--------------------------------------------------------------------
-
Copyright (c) 2007-2008 Michael G Schwern
This software originally derived from Paul Sheer's pivotal_gmtime_r.c.
diff --git a/libc/arch-x86/string/sse2-memrchr-atom.S b/libc/arch-x86/string/sse2-memrchr-atom.S
deleted file mode 100644
index 1aa1a1a..0000000
--- a/libc/arch-x86/string/sse2-memrchr-atom.S
+++ /dev/null
@@ -1,778 +0,0 @@
-/*
-Copyright (c) 2011, Intel Corporation
-All rights reserved.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions are met:
-
- * Redistributions of source code must retain the above copyright notice,
- * this list of conditions and the following disclaimer.
-
- * Redistributions in binary form must reproduce the above copyright notice,
- * this list of conditions and the following disclaimer in the documentation
- * and/or other materials provided with the distribution.
-
- * Neither the name of Intel Corporation nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
-ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
-DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
-ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
-(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
-LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
-ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-*/
-
-#ifndef L
-# define L(label) .L##label
-#endif
-
-#ifndef cfi_startproc
-# define cfi_startproc .cfi_startproc
-#endif
-
-#ifndef cfi_endproc
-# define cfi_endproc .cfi_endproc
-#endif
-
-#ifndef cfi_rel_offset
-# define cfi_rel_offset(reg, off) .cfi_rel_offset reg, off
-#endif
-
-#ifndef cfi_restore
-# define cfi_restore(reg) .cfi_restore reg
-#endif
-
-#ifndef cfi_adjust_cfa_offset
-# define cfi_adjust_cfa_offset(off) .cfi_adjust_cfa_offset off
-#endif
-
-#ifndef ENTRY
-# define ENTRY(name) \
- .type name, @function; \
- .globl name; \
- .p2align 4; \
-name: \
- cfi_startproc
-#endif
-
-#ifndef END
-# define END(name) \
- cfi_endproc; \
- .size name, .-name
-#endif
-
-#define CFI_PUSH(REG) \
- cfi_adjust_cfa_offset (4); \
- cfi_rel_offset (REG, 0)
-
-#define CFI_POP(REG) \
- cfi_adjust_cfa_offset (-4); \
- cfi_restore (REG)
-
-#define PUSH(REG) pushl REG; CFI_PUSH (REG)
-#define POP(REG) popl REG; CFI_POP (REG)
-
-#define PARMS 4
-#define STR1 PARMS
-#define STR2 STR1+4
-#define LEN STR2+4
-
- .text
-ENTRY (memrchr)
- mov STR1(%esp), %ecx
- movd STR2(%esp), %xmm1
- mov LEN(%esp), %edx
-
- test %edx, %edx
- jz L(return_null)
- sub $16, %edx
- jbe L(length_less16)
-
- punpcklbw %xmm1, %xmm1
- add %edx, %ecx
- punpcklbw %xmm1, %xmm1
-
- movdqu (%ecx), %xmm0
- pshufd $0, %xmm1, %xmm1
- pcmpeqb %xmm1, %xmm0
-
- pmovmskb %xmm0, %eax
- test %eax, %eax
- jnz L(exit_dispatch)
-
- sub $64, %ecx
- mov %ecx, %eax
- and $15, %eax
- jz L(loop_prolog)
-
- add $16, %ecx
- add $16, %edx
- and $-16, %ecx
- sub %eax, %edx
-
- .p2align 4
-/* Loop start on aligned string. */
-L(loop_prolog):
- sub $64, %edx
- jbe L(exit_loop)
-
- movdqa 48(%ecx), %xmm0
- pcmpeqb %xmm1, %xmm0
- pmovmskb %xmm0, %eax
- test %eax, %eax
- jnz L(matches48)
-
- movdqa 32(%ecx), %xmm2
- pcmpeqb %xmm1, %xmm2
- pmovmskb %xmm2, %eax
- test %eax, %eax
- jnz L(matches32)
-
- movdqa 16(%ecx), %xmm3
- pcmpeqb %xmm1, %xmm3
- pmovmskb %xmm3, %eax
- test %eax, %eax
- jnz L(matches16)
-
- movdqa (%ecx), %xmm4
- pcmpeqb %xmm1, %xmm4
- pmovmskb %xmm4, %eax
- test %eax, %eax
- jnz L(exit_dispatch)
-
- sub $64, %ecx
- sub $64, %edx
- jbe L(exit_loop)
-
- movdqa 48(%ecx), %xmm0
- pcmpeqb %xmm1, %xmm0
- pmovmskb %xmm0, %eax
- test %eax, %eax
- jnz L(matches48)
-
- movdqa 32(%ecx), %xmm2
- pcmpeqb %xmm1, %xmm2
- pmovmskb %xmm2, %eax
- test %eax, %eax
- jnz L(matches32)
-
- movdqa 16(%ecx), %xmm3
- pcmpeqb %xmm1, %xmm3
- pmovmskb %xmm3, %eax
- test %eax, %eax
- jnz L(matches16)
-
- movdqa (%ecx), %xmm3
- pcmpeqb %xmm1, %xmm3
- pmovmskb %xmm3, %eax
- test %eax, %eax
- jnz L(exit_dispatch)
-
- mov %ecx, %eax
- and $63, %eax
- test %eax, %eax
- jz L(align64_loop)
-
- add $64, %ecx
- add $64, %edx
- and $-64, %ecx
- sub %eax, %edx
-
- .p2align 4
-L(align64_loop):
- sub $64, %ecx
- sub $64, %edx
- jbe L(exit_loop)
-
- movdqa (%ecx), %xmm0
- movdqa 16(%ecx), %xmm2
- movdqa 32(%ecx), %xmm3
- movdqa 48(%ecx), %xmm4
-
- pcmpeqb %xmm1, %xmm0
- pcmpeqb %xmm1, %xmm2
- pcmpeqb %xmm1, %xmm3
- pcmpeqb %xmm1, %xmm4
-
- pmaxub %xmm3, %xmm0
- pmaxub %xmm4, %xmm2
- pmaxub %xmm0, %xmm2
- pmovmskb %xmm2, %eax
-
- test %eax, %eax
- jz L(align64_loop)
-
- pmovmskb %xmm4, %eax
- test %eax, %eax
- jnz L(matches48)
-
- pmovmskb %xmm3, %eax
- test %eax, %eax
- jnz L(matches32)
-
- movdqa 16(%ecx), %xmm2
-
- pcmpeqb %xmm1, %xmm2
- pcmpeqb (%ecx), %xmm1
-
- pmovmskb %xmm2, %eax
- test %eax, %eax
- jnz L(matches16)
-
- pmovmskb %xmm1, %eax
- test %ah, %ah
- jnz L(exit_dispatch_high)
- mov %al, %dl
- and $15 << 4, %dl
- jnz L(exit_dispatch_8)
- test $0x08, %al
- jnz L(exit_4)
- test $0x04, %al
- jnz L(exit_3)
- test $0x02, %al
- jnz L(exit_2)
- mov %ecx, %eax
- ret
-
- .p2align 4
-L(exit_loop):
- add $64, %edx
- cmp $32, %edx
- jbe L(exit_loop_32)
-
- movdqa 48(%ecx), %xmm0
- pcmpeqb %xmm1, %xmm0
- pmovmskb %xmm0, %eax
- test %eax, %eax
- jnz L(matches48)
-
- movdqa 32(%ecx), %xmm2
- pcmpeqb %xmm1, %xmm2
- pmovmskb %xmm2, %eax
- test %eax, %eax
- jnz L(matches32)
-
- movdqa 16(%ecx), %xmm3
- pcmpeqb %xmm1, %xmm3
- pmovmskb %xmm3, %eax
- test %eax, %eax
- jnz L(matches16_1)
- cmp $48, %edx
- jbe L(return_null)
-
- pcmpeqb (%ecx), %xmm1
- pmovmskb %xmm1, %eax
- test %eax, %eax
- jnz L(matches0_1)
- xor %eax, %eax
- ret
-
- .p2align 4
-L(exit_loop_32):
- movdqa 48(%ecx), %xmm0
- pcmpeqb %xmm1, %xmm0
- pmovmskb %xmm0, %eax
- test %eax, %eax
- jnz L(matches48_1)
- cmp $16, %edx
- jbe L(return_null)
-
- pcmpeqb 32(%ecx), %xmm1
- pmovmskb %xmm1, %eax
- test %eax, %eax
- jnz L(matches32_1)
- xor %eax, %eax
- ret
-
- .p2align 4
-L(matches16):
- lea 16(%ecx), %ecx
- test %ah, %ah
- jnz L(exit_dispatch_high)
- mov %al, %dl
- and $15 << 4, %dl
- jnz L(exit_dispatch_8)
- test $0x08, %al
- jnz L(exit_4)
- test $0x04, %al
- jnz L(exit_3)
- test $0x02, %al
- jnz L(exit_2)
- mov %ecx, %eax
- ret
-
- .p2align 4
-L(matches32):
- lea 32(%ecx), %ecx
- test %ah, %ah
- jnz L(exit_dispatch_high)
- mov %al, %dl
- and $15 << 4, %dl
- jnz L(exit_dispatch_8)
- test $0x08, %al
- jnz L(exit_4)
- test $0x04, %al
- jnz L(exit_3)
- test $0x02, %al
- jnz L(exit_2)
- mov %ecx, %eax
- ret
-
- .p2align 4
-L(matches48):
- lea 48(%ecx), %ecx
-
- .p2align 4
-L(exit_dispatch):
- test %ah, %ah
- jnz L(exit_dispatch_high)
- mov %al, %dl
- and $15 << 4, %dl
- jnz L(exit_dispatch_8)
- test $0x08, %al
- jnz L(exit_4)
- test $0x04, %al
- jnz L(exit_3)
- test $0x02, %al
- jnz L(exit_2)
- mov %ecx, %eax
- ret
-
- .p2align 4
-L(exit_dispatch_8):
- test $0x80, %al
- jnz L(exit_8)
- test $0x40, %al
- jnz L(exit_7)
- test $0x20, %al
- jnz L(exit_6)
- lea 4(%ecx), %eax
- ret
-
- .p2align 4
-L(exit_dispatch_high):
- mov %ah, %dh
- and $15 << 4, %dh
- jnz L(exit_dispatch_high_8)
- test $0x08, %ah
- jnz L(exit_12)
- test $0x04, %ah
- jnz L(exit_11)
- test $0x02, %ah
- jnz L(exit_10)
- lea 8(%ecx), %eax
- ret
-
- .p2align 4
-L(exit_dispatch_high_8):
- test $0x80, %ah
- jnz L(exit_16)
- test $0x40, %ah
- jnz L(exit_15)
- test $0x20, %ah
- jnz L(exit_14)
- lea 12(%ecx), %eax
- ret
-
- .p2align 4
-L(exit_2):
- lea 1(%ecx), %eax
- ret
-
- .p2align 4
-L(exit_3):
- lea 2(%ecx), %eax
- ret
-
- .p2align 4
-L(exit_4):
- lea 3(%ecx), %eax
- ret
-
- .p2align 4
-L(exit_6):
- lea 5(%ecx), %eax
- ret
-
- .p2align 4
-L(exit_7):
- lea 6(%ecx), %eax
- ret
-
- .p2align 4
-L(exit_8):
- lea 7(%ecx), %eax
- ret
-
- .p2align 4
-L(exit_10):
- lea 9(%ecx), %eax
- ret
-
- .p2align 4
-L(exit_11):
- lea 10(%ecx), %eax
- ret
-
- .p2align 4
-L(exit_12):
- lea 11(%ecx), %eax
- ret
-
- .p2align 4
-L(exit_14):
- lea 13(%ecx), %eax
- ret
-
- .p2align 4
-L(exit_15):
- lea 14(%ecx), %eax
- ret
-
- .p2align 4
-L(exit_16):
- lea 15(%ecx), %eax
- ret
-
- .p2align 4
-L(matches0_1):
- lea -64(%edx), %edx
-
- test %ah, %ah
- jnz L(exit_dispatch_1_high)
- mov %al, %ah
- and $15 << 4, %ah
- jnz L(exit_dispatch_1_8)
- test $0x08, %al
- jnz L(exit_1_4)
- test $0x04, %al
- jnz L(exit_1_3)
- test $0x02, %al
- jnz L(exit_1_2)
-
- add $0, %edx
- jl L(return_null)
- mov %ecx, %eax
- ret
-
- .p2align 4
-L(matches16_1):
- lea -48(%edx), %edx
- lea 16(%ecx), %ecx
-
- test %ah, %ah
- jnz L(exit_dispatch_1_high)
- mov %al, %ah
- and $15 << 4, %ah
- jnz L(exit_dispatch_1_8)
- test $0x08, %al
- jnz L(exit_1_4)
- test $0x04, %al
- jnz L(exit_1_3)
- test $0x02, %al
- jnz L(exit_1_2)
-
- add $0, %edx
- jl L(return_null)
- mov %ecx, %eax
- ret
-
- .p2align 4
-L(matches32_1):
- lea -32(%edx), %edx
- lea 32(%ecx), %ecx
-
- test %ah, %ah
- jnz L(exit_dispatch_1_high)
- mov %al, %ah
- and $15 << 4, %ah
- jnz L(exit_dispatch_1_8)
- test $0x08, %al
- jnz L(exit_1_4)
- test $0x04, %al
- jnz L(exit_1_3)
- test $0x02, %al
- jnz L(exit_1_2)
-
- add $0, %edx
- jl L(return_null)
- mov %ecx, %eax
- ret
-
- .p2align 4
-L(matches48_1):
- lea -16(%edx), %edx
- lea 48(%ecx), %ecx
-
- .p2align 4
-L(exit_dispatch_1):
- test %ah, %ah
- jnz L(exit_dispatch_1_high)
- mov %al, %ah
- and $15 << 4, %ah
- jnz L(exit_dispatch_1_8)
- test $0x08, %al
- jnz L(exit_1_4)
- test $0x04, %al
- jnz L(exit_1_3)
- test $0x02, %al
- jnz L(exit_1_2)
-
- add $0, %edx
- jl L(return_null)
- mov %ecx, %eax
- ret
-
- .p2align 4
-L(exit_dispatch_1_8):
- test $0x80, %al
- jnz L(exit_1_8)
- test $0x40, %al
- jnz L(exit_1_7)
- test $0x20, %al
- jnz L(exit_1_6)
-
- add $4, %edx
- jl L(return_null)
- lea 4(%ecx), %eax
- ret
-
- .p2align 4
-L(exit_dispatch_1_high):
- mov %ah, %al
- and $15 << 4, %al
- jnz L(exit_dispatch_1_high_8)
- test $0x08, %ah
- jnz L(exit_1_12)
- test $0x04, %ah
- jnz L(exit_1_11)
- test $0x02, %ah
- jnz L(exit_1_10)
-
- add $8, %edx
- jl L(return_null)
- lea 8(%ecx), %eax
- ret
-
- .p2align 4
-L(exit_dispatch_1_high_8):
- test $0x80, %ah
- jnz L(exit_1_16)
- test $0x40, %ah
- jnz L(exit_1_15)
- test $0x20, %ah
- jnz L(exit_1_14)
-
- add $12, %edx
- jl L(return_null)
- lea 12(%ecx), %eax
- ret
-
- .p2align 4
-L(exit_1_2):
- add $1, %edx
- jl L(return_null)
- lea 1(%ecx), %eax
- ret
-
- .p2align 4
-L(exit_1_3):
- add $2, %edx
- jl L(return_null)
- lea 2(%ecx), %eax
- ret
-
- .p2align 4
-L(exit_1_4):
- add $3, %edx
- jl L(return_null)
- lea 3(%ecx), %eax
- ret
-
- .p2align 4
-L(exit_1_6):
- add $5, %edx
- jl L(return_null)
- lea 5(%ecx), %eax
- ret
-
- .p2align 4
-L(exit_1_7):
- add $6, %edx
- jl L(return_null)
- lea 6(%ecx), %eax
- ret
-
- .p2align 4
-L(exit_1_8):
- add $7, %edx
- jl L(return_null)
- lea 7(%ecx), %eax
- ret
-
- .p2align 4
-L(exit_1_10):
- add $9, %edx
- jl L(return_null)
- lea 9(%ecx), %eax
- ret
-
- .p2align 4
-L(exit_1_11):
- add $10, %edx
- jl L(return_null)
- lea 10(%ecx), %eax
- ret
-
- .p2align 4
-L(exit_1_12):
- add $11, %edx
- jl L(return_null)
- lea 11(%ecx), %eax
- ret
-
- .p2align 4
-L(exit_1_14):
- add $13, %edx
- jl L(return_null)
- lea 13(%ecx), %eax
- ret
-
- .p2align 4
-L(exit_1_15):
- add $14, %edx
- jl L(return_null)
- lea 14(%ecx), %eax
- ret
-
- .p2align 4
-L(exit_1_16):
- add $15, %edx
- jl L(return_null)
- lea 15(%ecx), %eax
- ret
-
- .p2align 4
-L(return_null):
- xor %eax, %eax
- ret
-
- .p2align 4
-L(length_less16_offset0):
- mov %dl, %cl
- pcmpeqb (%eax), %xmm1
-
- mov $1, %edx
- sal %cl, %edx
- sub $1, %edx
-
- mov %eax, %ecx
- pmovmskb %xmm1, %eax
-
- and %edx, %eax
- test %eax, %eax
- jnz L(exit_dispatch)
-
- xor %eax, %eax
- ret
-
- .p2align 4
-L(length_less16):
- punpcklbw %xmm1, %xmm1
- add $16, %edx
- punpcklbw %xmm1, %xmm1
-
- mov %ecx, %eax
- pshufd $0, %xmm1, %xmm1
-
- and $15, %ecx
- jz L(length_less16_offset0)
-
- PUSH (%edi)
-
- mov %cl, %dh
- add %dl, %dh
- and $-16, %eax
-
- sub $16, %dh
- ja L(length_less16_part2)
-
- pcmpeqb (%eax), %xmm1
- pmovmskb %xmm1, %edi
-
- sar %cl, %edi
- add %ecx, %eax
- mov %dl, %cl
-
- mov $1, %edx
- sal %cl, %edx
- sub $1, %edx
-
- and %edx, %edi
- test %edi, %edi
- jz L(ret_null)
-
- bsr %edi, %edi
- add %edi, %eax
- POP (%edi)
- ret
-
- CFI_PUSH (%edi)
-
- .p2align 4
-L(length_less16_part2):
- movdqa 16(%eax), %xmm2
- pcmpeqb %xmm1, %xmm2
- pmovmskb %xmm2, %edi
-
- mov %cl, %ch
-
- mov %dh, %cl
- mov $1, %edx
- sal %cl, %edx
- sub $1, %edx
-
- and %edx, %edi
-
- test %edi, %edi
- jnz L(length_less16_part2_return)
-
- pcmpeqb (%eax), %xmm1
- pmovmskb %xmm1, %edi
-
- mov %ch, %cl
- sar %cl, %edi
- test %edi, %edi
- jz L(ret_null)
-
- bsr %edi, %edi
- add %edi, %eax
- xor %ch, %ch
- add %ecx, %eax
- POP (%edi)
- ret
-
- CFI_PUSH (%edi)
-
- .p2align 4
-L(length_less16_part2_return):
- bsr %edi, %edi
- lea 16(%eax, %edi), %eax
- POP (%edi)
- ret
-
- CFI_PUSH (%edi)
-
- .p2align 4
-L(ret_null):
- xor %eax, %eax
- POP (%edi)
- ret
-
-END (memrchr)
diff --git a/libc/upstream-openbsd/lib/libc/string/memrchr.c b/libc/upstream-openbsd/lib/libc/string/memrchr.c
deleted file mode 100644
index e123bc1..0000000
--- a/libc/upstream-openbsd/lib/libc/string/memrchr.c
+++ /dev/null
@@ -1,39 +0,0 @@
-/* $OpenBSD: memrchr.c,v 1.4 2019/01/25 00:19:25 millert Exp $ */
-
-/*
- * Copyright (c) 2007 Todd C. Miller <millert@openbsd.org>
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- */
-
-#include <string.h>
-
-/*
- * Reverse memchr()
- * Find the last occurrence of 'c' in the buffer 's' of size 'n'.
- */
-void *
-memrchr(const void *s, int c, size_t n)
-{
- const unsigned char *cp;
-
- if (n != 0) {
- cp = (unsigned char *)s + n;
- do {
- if (*(--cp) == (unsigned char)c)
- return((void *)cp);
- } while (--n != 0);
- }
- return(NULL);
-}
-DEF_WEAK(memrchr);