X-Git-Url: https://git.ucc.asn.au/?a=blobdiff_plain;f=Usermode%2FLibraries%2Flibc.so_src%2Fstring.c;h=1c052366dfc984a5560a3adacfe75c870c11591e;hb=cd0a4d84497fe89a8680ac0b881007ab6e97f44d;hp=98692b215b9f00f510470ad2d5c68f7fc4f9c617;hpb=95a7eaaa4a1065334125b65130866f8d1048ddb7;p=tpg%2Facess2.git

diff --git a/Usermode/Libraries/libc.so_src/string.c b/Usermode/Libraries/libc.so_src/string.c
index 98692b21..1c052366 100644
--- a/Usermode/Libraries/libc.so_src/string.c
+++ b/Usermode/Libraries/libc.so_src/string.c
@@ -19,6 +19,19 @@ EXPORT int strcmp(const char *s1, const char *s2)
 	return (int)*s1 - (int)*s2;
 }
 
+/**
+ * \fn EXPORT int strncmp(const char *s1, const char *s2)
+ * \brief Compare two strings
+ */
+EXPORT int strncmp(const char *s1, const char *s2, size_t n)
+{
+	if( n == 0 )	return 0;
+	while(n -- && *s1 == *s2 && *s1 != '\0' && *s2 != '\0') {
+		s1++; s2++;
+	}
+	return (int)*s1 - (int)*s2;
+}
+
 /**
  * \fn EXPORT char *strcpy(char *dst, const char *src)
  * \brief Copy a string to another
@@ -64,27 +77,25 @@ EXPORT char *strcat(char *dst, const char *src)
 }
 
 /**
- * \fn EXPORT int strlen(const char *str)
  * \brief Get the length of a string
  */
-EXPORT int strlen(const char *str)
+EXPORT size_t strlen(const char *str)
 {
-	int retval;
-	for(retval = 0; *str != '\0'; str++)
-		retval++;
+	size_t	retval;
+	for(retval = 0; *str != '\0'; str++, retval++);
 	return retval;
 }
 
 /**
- * \fn EXPORT int strncmp(const char *s1, const char *s2, size_t len)
- * \brief Compare two strings with a limit
+ * \brief Get the length of a string, with a maximum of \a maxlen
+ * 
+ * Gets the length of a string (excluding the terminating \0 byte)
  */
-EXPORT int strncmp(const char *s1, const char *s2, size_t len)
+EXPORT size_t strnlen(const char *str, size_t maxlen)
 {
-	while(--len && *s1 == *s2 && *s1 != '\0' && *s2 != '\0') {
-		s1++; s2++;
-	}
-	return (int)*s1 - (int)*s2;
+	size_t	len;
+	for( len = 0; maxlen -- && *str; str ++, len ++ );
+	return len;
 }
 
 /**
@@ -101,15 +112,34 @@ EXPORT char *strdup(const char *str)
 	return ret;
 }
 
+/**
+ * \fn EXPORT char *strndup(const char *str, size_t maxlen)
+ * \brief Duplicate a string into the heap with a maximum length
+ * \param str	Input string buffer
+ * \param maxlen	Maximum valid size of the \a str buffer
+ * \return Heap string with the same value of \a str
+ */
+EXPORT char *strndup(const char *str, size_t maxlen)
+{
+	size_t	len;
+	char	*ret;
+	for( len = 0; len < maxlen && str[len]; len ++) ;
+	ret = malloc( len + 1);
+	memcpy( ret, str, len );
+	ret[len] = '\0';
+	return ret;
+}
+
 /**
  * \fn EXPORT char *strchr(char *str, int character)
  * \brief Locate a character in a string
  */
-EXPORT char *strchr(char *str, int character)
+EXPORT char *strchr(const char *str, int character)
 {
-	while(*str)
+	for(;*str;str++)
 	{
-		if(*str == character)	return str;
+		if(*str == character)
+			return (char*)str;
 	}
 	return NULL;
 }
@@ -118,13 +148,14 @@ EXPORT char *strchr(char *str, int character)
  * \fn EXPORT char *strrchr(char *str, int character)
  * \brief Locate the last occurance of a character in a string
  */
-EXPORT char *strrchr(char *str, int character)
+EXPORT char *strrchr(const char *str, int character)
 {
 	 int	i;
 	i = strlen(str)-1;
 	while(i--)
 	{
-		if(str[i] == character)	return &str[i];
+		if(str[i] == character)
+			return (void*)&str[i];
 	}
 	return NULL;
 }
@@ -137,12 +168,11 @@ EXPORT char *strstr(char *str1, const char *str2)
 {
 	const char	*test = str2;
 	
-	while(*str1)
+	for(;*str1;str1++)
 	{
 		if(*test == '\0')	return str1;
 		if(*str1 == *test)	test++;
 		else	test = str2;
-		str1 ++;
 	}
 	return NULL;
 }
@@ -180,7 +210,7 @@ EXPORT void *memmove(void *dest, const void *src, size_t count)
     char *sp = (char *)src;
     char *dp = (char *)dest;
 	// Check if corruption will happen
-	if( (unsigned int)dest > (unsigned int)src && (unsigned int)dest < (unsigned int)src+count )
+	if( (intptr_t)dest > (intptr_t)src && (intptr_t)dest < (intptr_t)src+count )
 		for(;count--;) dp[count] = sp[count];
 	else
     	for(;count--;) *dp++ = *sp++;
@@ -213,12 +243,12 @@ EXPORT int memcmp(const void *mem1, const void *mem2, size_t count)
  * \param value	Value to find
  * \param num	Size of memory area to check
  */
-EXPORT void *memchr(void *ptr, int value, size_t num)
+EXPORT void *memchr(const void *ptr, int value, size_t num)
 {
 	while(num--)
 	{
-		if( *(unsigned char*)ptr == (unsigned char)value )
-			return ptr;
+		if( *(const unsigned char*)ptr == (unsigned char)value )
+			return (void*)ptr;
 		ptr ++;
 	}
 	return NULL;