add strchr and strtok implementation.

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@532 bbd45198-f89e-11dd-88c7-29a3b14d5316

libc/minilibc/string.c

@@ -13,6 +13,7 @@
  * 2010-02-15     Gary Lee     add strlcpy
  * 2010-03-17     Bernard      add strlcpy implementation to this file.
  *                             fix strlcpy declaration
+ * 2010-03-24     Bernard      add strchr and strtok implementation.
  */
 
 #include <rtthread.h>
@@ -548,4 +549,60 @@ int sscanf(const char * buf, const char * fmt, ...)
 	return i;
 }
 
+size_t strspn(const char *s, const char *accept)
+{
+	size_t l=0;
+	int a=1,i, al=strlen(accept);
+
+	while((a)&&(*s))
+	{
+		for(a=i=0;(!a)&&(i<al);i++)
+			if (*s==accept[i]) a=1;
+		if (a) l++;
+		s++;
+	}
+	return l;
+}
+
+char*strtok_r(char*s,const char*delim,char**ptrptr)
+{
+	char*tmp=0;
+
+	if (s==0) s=*ptrptr;
+	s += strspn(s,delim);	/* overread leading delimiter */
+	if (*s)
+	{
+		tmp=s;
+		s+=strcspn(s,delim);
+
+		if (*s) *s++=0;		/* not the end ? => terminate it */
+	}
+	*ptrptr=s;
+	return tmp;
+}
+
+char *strtok(char *s, const char *delim)
+{
+	static char *strtok_pos;
+	return strtok_r(s,delim,&strtok_pos);
+}
+
+char *strchr(const char *s1, int i)
+{
+	const unsigned char *s = (const unsigned char *)s1;
+	unsigned char c = (unsigned int)i;
+
+	while (*s && *s != c)
+	{
+		s++;
+	}
+
+	if (*s != c)
+	{
+		s = NULL;
+	}
+
+	return (char *) s;
+}
+
 #endif

libc/minilibc/string.h

@@ -64,8 +64,11 @@ char *strncpy(char *dest, const char *src, size_t n);
 size_t strlcpy(char *dst, const char *src, size_t siz);
 char *strncat(char *dest, const char *src, size_t count);
 char *strcat(char * dest, const char * src);
+char *strchr(const char *s1, int i);
 char *strrchr(const char *t, int c);
 char *strdup(const char *s);
+char *strtok(char *s, const char *delim);
+char*strtok_r(char*s, const char*delim, char**ptrptr);
 
 #endif