[libc] [clang] [Libc] Give more functions restrict qualifiers (PR #78061)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-libc

@llvm/pr-subscribers-clang

Author: AtariDreams (AtariDreams)

<details>
<summary>Changes</summary>

strsep has restrict qualifiers, as well as strtok_r. Add the restrict qualifiers to them.

Source: https://man7.org/linux/man-pages/man3/strsep.3.html

---
Full diff: https://github.com/llvm/llvm-project/pull/78061.diff


4 Files Affected:

- (modified) clang/test/Analysis/Inputs/system-header-simulator.h (+3-3) 
- (modified) clang/test/Analysis/string.c (+2-2) 
- (modified) libc/src/string/strsep.cpp (+1-1) 
- (modified) libc/src/string/strsep.h (+1-1) 


``````````diff
diff --git a/clang/test/Analysis/Inputs/system-header-simulator.h b/clang/test/Analysis/Inputs/system-header-simulator.h
index cd7ac616bcc67f..5f969adfdd92cd 100644
--- a/clang/test/Analysis/Inputs/system-header-simulator.h
+++ b/clang/test/Analysis/Inputs/system-header-simulator.h
@@ -71,9 +71,9 @@ int fflush(FILE *stream);
 size_t strlen(const char *);
 
 char *strcpy(char *restrict, const char *restrict);
-char *strncpy(char *dst, const char *src, size_t n);
-char *strsep(char **stringp, const char *delim);
-void *memcpy(void *dst, const void *src, size_t n);
+char *strncpy(char *restrict dst, const char * restrict src, size_t n);
+char *strsep(char ** restrict stringp, const char * restrict delim);
+void *memcpy(void * restrict dst, const void * restrict src, size_t n);
 void *memset(void *s, int c, size_t n);
 
 typedef unsigned long __darwin_pthread_key_t;
diff --git a/clang/test/Analysis/string.c b/clang/test/Analysis/string.c
index d47de9db8228e5..85232624160c06 100644
--- a/clang/test/Analysis/string.c
+++ b/clang/test/Analysis/string.c
@@ -71,7 +71,7 @@ void clang_analyzer_eval(int);
 int scanf(const char *restrict format, ...);
 void *malloc(size_t);
 void free(void *);
-void *memcpy(void *dest, const void *src, size_t n);
+void *memcpy(void *restrict dest, const void *restrict src, size_t n);
 
 //===----------------------------------------------------------------------===
 // strlen()
@@ -1252,7 +1252,7 @@ int strncasecmp_null_argument(char *a, size_t n) {
 // strsep()
 //===----------------------------------------------------------------------===
 
-char *strsep(char **stringp, const char *delim);
+char *strsep(char ** restrict stringp, const char * restrict delim);
 
 void strsep_null_delim(char *s) {
   strsep(&s, NULL); // expected-warning{{Null pointer passed as 2nd argument to strsep()}}
diff --git a/libc/src/string/strsep.cpp b/libc/src/string/strsep.cpp
index edd2cf07e20a45..ce74223ee7721d 100644
--- a/libc/src/string/strsep.cpp
+++ b/libc/src/string/strsep.cpp
@@ -12,7 +12,7 @@
 
 namespace LIBC_NAMESPACE {
 
-LLVM_LIBC_FUNCTION(char *, strsep, (char **stringp, const char *delim)) {
+LLVM_LIBC_FUNCTION(char *, strsep, (char ** __restrict stringp, const char * __restrict delim)) {
   if (!*stringp)
     return nullptr;
   return internal::string_token<false>(*stringp, delim, stringp);
diff --git a/libc/src/string/strsep.h b/libc/src/string/strsep.h
index 48f55a899d7f33..d0a22f4af89119 100644
--- a/libc/src/string/strsep.h
+++ b/libc/src/string/strsep.h
@@ -11,7 +11,7 @@
 
 namespace LIBC_NAMESPACE {
 
-char *strsep(char **stringp, const char *delim);
+char *strsep(char ** __restrict stringp, const char * __restrict delim);
 
 } // namespace LIBC_NAMESPACE
 

``````````

</details>


https://github.com/llvm/llvm-project/pull/78061