Changeset 517cedc0 in mainline

Timestamp:

2011-07-01T19:30:59Z (14 years ago)

Author:

Jiří Zárevúcky <zarevucky.jiri@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

b52ef5a

Parents:

65ed8f4

Message:

string.h: Add strchrnul().

Location:

uspace/lib/posix

Files:

• string.c (modified) (7 diffs)
• string.h (modified) (2 diffs)

uspace/lib/posix/string.c

@@ -44 +44 @@
 
 /**
- * Defined for convenience. Returns pointer to the terminating nul character.
- *
- * @param s
- * @return
- */
-static char *strzero(const char *s)
-{
-        while (*s != '\0') {
-                s++;
-        }
-
-        return (char *) s;
-}
-
-/**
  * Returns true if s2 is a prefix of s1.
  *
@@ -183 +168 @@
         assert(src != NULL);
 
-        posix_strcpy(strzero(dest), src);
+        posix_strcpy(posix_strchr(dest, '\0'), src);
         return dest;
 }
@@ -199 +184 @@
         assert(src != NULL);
 
-        char *zeroptr = posix_strncpy(strzero(dest), src, n);
+        char *zeroptr = posix_strncpy(posix_strchr(dest, '\0'), src, n);
         /* strncpy doesn't append the nul terminator, so we do it here */
         zeroptr[n] = '\0';
@@ -360 +345 @@
         assert(s != NULL);
         
-        /* special handling for the case that zero is searched for */
-        if (c == '\0') {
-                return strzero(s);
-        }
-        
-        /* otherwise just loop through the string until found */
-        while (*s != (char) c) {
-                if (*s == '\0') {
-                        return NULL;
-                }
-
-                s++;
-        }
-        
-        return (char *) s;
+        char *res = gnu_strchrnul(s, c);
+        return (*res == c) ? res : NULL;
 }
 
@@ -387 +359 @@
         assert(s != NULL);
         
-        const char *ptr = strzero(s);
+        const char *ptr = posix_strchr(s, '\0');
         
         /* the same as in strchr, except it loops in reverse direction */
@@ -399 +371 @@
 
         return (char *) ptr;
+}
+
+char *gnu_strchrnul(const char *s, int c)
+{
+        assert(s != NULL);
+        
+        while (*s != c && *s != '\0') {
+                s++;
+        }
+        
+        return (char *) s;
 }
 
@@ -562 +545 @@
         assert(s != NULL);
         
-        return (size_t) (strzero(s) - s);
+        return (size_t) (posix_strchr(s, '\0') - s);
 }
 

uspace/lib/posix/string.h

@@ -85 +85 @@
 extern char *posix_strchr(const char *s, int c);
 extern char *posix_strrchr(const char *s, int c);
+extern char *gnu_strchrnul(const char *s, int c);
 extern char *posix_strpbrk(const char *s1, const char *s2);
 extern size_t posix_strcspn(const char *s1, const char *s2);
@@ -127 +128 @@
         #define strchr posix_strchr
         #define strrchr posix_strrchr
+        #define strchrnul gnu_strchrnul
         #define strpbrk posix_strpbrk
         #define strcspn posix_strcspn