X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=lib%2Fstring.c;h=afce96af3afdf7d6a0e1e343b4260c6f24765f74;hb=8f0ddf91f2aeb09602373e400cf8b403e9017210;hp=7be6f0a87e837638b0ecdf83db9324f0373bdedd;hpb=8833d328caf009f8da58337e17a2cf5d52993a7c;p=safe%2Fjmp%2Flinux-2.6

diff --git a/lib/string.c b/lib/string.c
index 7be6f0a..afce96a 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -60,6 +60,34 @@ int strnicmp(const char *s1, const char *s2, size_t len)
 EXPORT_SYMBOL(strnicmp);
 #endif
 
+#ifndef __HAVE_ARCH_STRCASECMP
+int strcasecmp(const char *s1, const char *s2)
+{
+	int c1, c2;
+
+	do {
+		c1 = tolower(*s1++);
+		c2 = tolower(*s2++);
+	} while (c1 == c2 && c1 != 0);
+	return c1 - c2;
+}
+EXPORT_SYMBOL(strcasecmp);
+#endif
+
+#ifndef __HAVE_ARCH_STRNCASECMP
+int strncasecmp(const char *s1, const char *s2, size_t n)
+{
+	int c1, c2;
+
+	do {
+		c1 = tolower(*s1++);
+		c2 = tolower(*s2++);
+	} while ((--n > 0) && c1 == c2 && c1 != 0);
+	return c1 - c2;
+}
+EXPORT_SYMBOL(strncasecmp);
+#endif
+
 #ifndef __HAVE_ARCH_STRCPY
 /**
  * strcpy - Copy a %NUL terminated string
@@ -160,7 +188,7 @@ EXPORT_SYMBOL(strcat);
  * @src: The string to append to it
  * @count: The maximum numbers of bytes to copy
  *
- * Note that in contrast to strncpy, strncat ensures the result is
+ * Note that in contrast to strncpy(), strncat() ensures the result is
  * terminated.
  */
 char *strncat(char *dest, const char *src, size_t count)
@@ -218,13 +246,17 @@ EXPORT_SYMBOL(strlcat);
 #undef strcmp
 int strcmp(const char *cs, const char *ct)
 {
-	signed char __res;
+	unsigned char c1, c2;
 
 	while (1) {
-		if ((__res = *cs - *ct++) != 0 || !*cs++)
+		c1 = *cs++;
+		c2 = *ct++;
+		if (c1 != c2)
+			return c1 < c2 ? -1 : 1;
+		if (!c1)
 			break;
 	}
-	return __res;
+	return 0;
 }
 EXPORT_SYMBOL(strcmp);
 #endif
@@ -238,14 +270,18 @@ EXPORT_SYMBOL(strcmp);
  */
 int strncmp(const char *cs, const char *ct, size_t count)
 {
-	signed char __res = 0;
+	unsigned char c1, c2;
 
 	while (count) {
-		if ((__res = *cs - *ct++) != 0 || !*cs++)
+		c1 = *cs++;
+		c2 = *ct++;
+		if (c1 != c2)
+			return c1 < c2 ? -1 : 1;
+		if (!c1)
 			break;
 		count--;
 	}
-	return __res;
+	return 0;
 }
 EXPORT_SYMBOL(strncmp);
 #endif
@@ -301,6 +337,47 @@ char *strnchr(const char *s, size_t count, int c)
 EXPORT_SYMBOL(strnchr);
 #endif
 
+/**
+ * skip_spaces - Removes leading whitespace from @s.
+ * @s: The string to be stripped.
+ *
+ * Returns a pointer to the first non-whitespace character in @s.
+ */
+char *skip_spaces(const char *str)
+{
+	while (isspace(*str))
+		++str;
+	return (char *)str;
+}
+EXPORT_SYMBOL(skip_spaces);
+
+/**
+ * strim - Removes leading and trailing whitespace from @s.
+ * @s: The string to be stripped.
+ *
+ * Note that the first trailing whitespace is replaced with a %NUL-terminator
+ * in the given string @s. Returns a pointer to the first non-whitespace
+ * character in @s.
+ */
+char *strim(char *s)
+{
+	size_t size;
+	char *end;
+
+	s = skip_spaces(s);
+	size = strlen(s);
+	if (!size)
+		return s;
+
+	end = s + size - 1;
+	while (end >= s && isspace(*end))
+		end--;
+	*(end + 1) = '\0';
+
+	return s;
+}
+EXPORT_SYMBOL(strim);
+
 #ifndef __HAVE_ARCH_STRLEN
 /**
  * strlen - Find the length of a string
@@ -336,8 +413,7 @@ EXPORT_SYMBOL(strnlen);
 
 #ifndef __HAVE_ARCH_STRSPN
 /**
- * strspn - Calculate the length of the initial substring of @s which only
- * 	contain letters in @accept
+ * strspn - Calculate the length of the initial substring of @s which only contain letters in @accept
  * @s: The string to be searched
  * @accept: The string to search for
  */
@@ -364,8 +440,7 @@ EXPORT_SYMBOL(strspn);
 
 #ifndef __HAVE_ARCH_STRCSPN
 /**
- * strcspn - Calculate the length of the initial substring of @s which does
- * 	not contain letters in @reject
+ * strcspn - Calculate the length of the initial substring of @s which does not contain letters in @reject
  * @s: The string to be searched
  * @reject: The string to avoid
  */
@@ -437,6 +512,33 @@ char *strsep(char **s, const char *ct)
 EXPORT_SYMBOL(strsep);
 #endif
 
+/**
+ * sysfs_streq - return true if strings are equal, modulo trailing newline
+ * @s1: one string
+ * @s2: another string
+ *
+ * This routine returns true iff two strings are equal, treating both
+ * NUL and newline-then-NUL as equivalent string terminations.  It's
+ * geared for use with sysfs input strings, which generally terminate
+ * with newlines but are compared against values without newlines.
+ */
+bool sysfs_streq(const char *s1, const char *s2)
+{
+	while (*s1 && *s1 == *s2) {
+		s1++;
+		s2++;
+	}
+
+	if (*s1 == *s2)
+		return true;
+	if (!*s1 && *s2 == '\n' && !s2[1])
+		return true;
+	if (*s1 == '\n' && !s1[1] && !*s2)
+		return true;
+	return false;
+}
+EXPORT_SYMBOL(sysfs_streq);
+
 #ifndef __HAVE_ARCH_MEMSET
 /**
  * memset - Fill a region of memory with the given value
@@ -470,7 +572,7 @@ EXPORT_SYMBOL(memset);
 void *memcpy(void *dest, const void *src, size_t count)
 {
 	char *tmp = dest;
-	char *s = src;
+	const char *s = src;
 
 	while (count--)
 		*tmp++ = *s++;