xnu-3789.21.4.tar.gz

[apple/xnu.git] / osfmk / device / subrs.c

diff --git a/osfmk/device/subrs.c b/osfmk/device/subrs.c
index b9aafe5094dd000f071dfa9c8b3bcdc406a8e26c..e36267988e385207b58ea77f4ddd4ea05e13bd46 100644 (file)
--- a/osfmk/device/subrs.c
+++ b/osfmk/device/subrs.c
@@ -187,6 +187,8 @@ strcmp(
  *      comparison runs for at most "n" characters.
  */
 
+// ARM implementation in ../arm/strncmp.s
+// ARM64 implementation in ../arm64/strncmp.s
 int
 strncmp(
         const char *s1,
@@ -261,7 +263,6 @@ strncasecmp(const char *s1, const char *s2, size_t n)
  * Deprecation Warning: 
  *     strcpy() is being deprecated. Please use strlcpy() instead.
  */
-
 char *
 strcpy(
         char *to,
@@ -275,7 +276,6 @@ strcpy(
         return ret;
 }
 
-
 /*
  * Abstract:
  *      strncpy copies "count" characters from the "from" string to
@@ -285,6 +285,7 @@ strcpy(
  *      to the "to" string.
  */
 
+// ARM and ARM64 implementation in ../arm/strncpy.c
 char *
 strncpy(
        char *s1, 
@@ -378,7 +379,10 @@ atoi_term(
  * outputs:
  *     length of s or max; whichever is smaller
  */
-size_t 
+
+// ARM implementation in ../arm/strnlen.s
+// ARM64 implementation in ../arm64/strnlen.s
+size_t
 strnlen(const char *s, size_t max) {
        const char *es = s + max, *p = s;
        while(*p && p != es) 
@@ -482,6 +486,8 @@ strlcat(char *dst, const char *src, size_t siz)
  * will be copied.  Always NUL terminates (unless siz == 0).
  * Returns strlen(src); if retval >= siz, truncation occurred.
  */
+
+// ARM and ARM64 implementation in ../arm/strlcpy.c
 size_t
 strlcpy(char *dst, const char *src, size_t siz)
 {
@@ -535,7 +541,7 @@ strlcpy(char *dst, const char *src, size_t siz)
  *              one should use FREE() with the allocated buffer.
  *
  */
-inline char *
+char *
 STRDUP(const char *string, int type)
 {
        size_t len;
@@ -551,16 +557,37 @@ STRDUP(const char *string, int type)
 
 /*
  * Return TRUE(1) if string 2 is a prefix of string 1.
- */     
-int       
-strprefix(register const char *s1, register const char *s2)
-{               
-        register int    c;
-                
-        while ((c = *s2++) != '\0') {
-            if (c != *s1++) 
-                return (0);
-        }       
-        return (1);
+ */
+int
+strprefix(const char *s1, const char *s2)
+{
+       int c;
+
+       while ((c = *s2++) != '\0') {
+               if (c != *s1++)
+                       return (0);
+       }
+       return (1);
+}
+
+char *
+strnstr(char *s, const char *find, size_t slen)
+{
+  char c, sc;
+  size_t len;
+  
+  if ((c = *find++) != '\0') {
+    len = strlen(find);
+    do {
+      do {
+        if ((sc = *s++) == '\0' || slen-- < 1)
+          return (NULL);
+      } while (sc != c);
+      if (len > slen)
+        return (NULL);
+    } while (strncmp(s, find, len) != 0);
+    s--;
+  }
+  return (s);
 }