MXS-1450 Add more string trimming functions

- trim_leading
- trim_trailing

Implemented trim in terms of trim_leading and trim_trailing

include/maxscale/utils.h

@@ -81,7 +81,41 @@ void gw_sha1_2_str(const uint8_t *in, int in_len, const uint8_t *in2, int in2_le
 int gw_getsockerrno(int fd);
 char *create_hex_sha1_sha1_passwd(char *passwd);
 
+/**
+ * Trim leading whitespace from a string.
+ *
+ * @param str String to trim.
+ * @return @c str
+ *
+ * @note If there is leading whitespace, the string is moved so that
+ *       the returned pointer is always the same as the one given as
+ *       argument.
+ */
+char* trim_leading(char* str);
+
+/**
+ * Trim trailing whitespace from a string.
+ *
+ * @param str String to trim.
+ * @return @c str
+ *
+ * @note The returned pointer is always the same the one given as
+ *       argument.
+ */
+char* trim_trailing(char* str);
+
+/**
+ * Trim leading and trailing whitespace from a string.
+ *
+ * @param str String to trim.
+ * @return @c str
+ *
+ * @note If there is leading whitespace, the string is moved so that
+ *       the returned pointer is always the same the one given as
+ *       argument.
+ */
 char* trim(char *str);
+
 char* squeeze_whitespace(char* str);
 bool strip_escape_chars(char*);
 

server/core/test/testutils.cc

@@ -13,32 +13,67 @@
 
 #include <maxscale/utils.h>
 #include <string.h>
+#include <iostream>
+
+using std::cout;
+using std::endl;
 
 namespace
 {
 
-#define TRIM_TEST_CASE_ENTRY(zFrom, zTo) { zFrom, zTo }
+#define TRIM_TCE(zFrom, zTo) { zFrom, zTo }
 
 struct TRIM_TEST_CASE
 {
     const char* zFrom;
     const char* zTo;
-} trim_testcases[] =
+};
+
+TRIM_TEST_CASE trim_testcases[] =
 {
-    TRIM_TEST_CASE_ENTRY("", ""),
-    TRIM_TEST_CASE_ENTRY("a", "a"),
-    TRIM_TEST_CASE_ENTRY(" a", "a"),
-    TRIM_TEST_CASE_ENTRY("a ", "a"),
-    TRIM_TEST_CASE_ENTRY("a ", "a"),
-    TRIM_TEST_CASE_ENTRY(" a ", "a"),
-    TRIM_TEST_CASE_ENTRY("  a", "a"),
-    TRIM_TEST_CASE_ENTRY("a  ", "a"),
-    TRIM_TEST_CASE_ENTRY("  a  ", "a"),
-    TRIM_TEST_CASE_ENTRY("  a b  ", "a b"),
+    TRIM_TCE("", ""),
+    TRIM_TCE("a", "a"),
+    TRIM_TCE(" a", "a"),
+    TRIM_TCE("a ", "a"),
+    TRIM_TCE(" a ", "a"),
+    TRIM_TCE("  a", "a"),
+    TRIM_TCE("a  ", "a"),
+    TRIM_TCE("  a  ", "a"),
+    TRIM_TCE("  a b  ", "a b"),
 };
 
 const int n_trim_testcases = sizeof(trim_testcases) / sizeof(trim_testcases[0]);
 
+TRIM_TEST_CASE trim_leading_testcases[] =
+{
+    TRIM_TCE("", ""),
+    TRIM_TCE("a", "a"),
+    TRIM_TCE(" a", "a"),
+    TRIM_TCE("a ", "a "),
+    TRIM_TCE(" a ", "a "),
+    TRIM_TCE("  a", "a"),
+    TRIM_TCE("a  ", "a  "),
+    TRIM_TCE("  a  ", "a  "),
+    TRIM_TCE("  a b  ", "a b  "),
+};
+
+const int n_trim_leading_testcases = sizeof(trim_leading_testcases) / sizeof(trim_leading_testcases[0]);
+
+TRIM_TEST_CASE trim_trailing_testcases[] =
+{
+    TRIM_TCE("", ""),
+    TRIM_TCE("a", "a"),
+    TRIM_TCE(" a", " a"),
+    TRIM_TCE("a ", "a"),
+    TRIM_TCE(" a ", " a"),
+    TRIM_TCE("  a", "  a"),
+    TRIM_TCE("a  ", "a"),
+    TRIM_TCE("  a  ", "  a"),
+    TRIM_TCE("  a b  ", "  a b"),
+};
+
+const int n_trim_trailing_testcases = sizeof(trim_trailing_testcases) / sizeof(trim_trailing_testcases[0]);
+
 
 int test(TRIM_TEST_CASE* pTest_cases, int n_test_cases, char* (*p)(char*))
 {
@@ -63,18 +98,33 @@ int test(TRIM_TEST_CASE* pTest_cases, int n_test_cases, char* (*p)(char*))
     return rv;
 }
 
-int test1()
+int test_trim()
 {
+    cout << "trim()" << endl;
     return test(trim_testcases, n_trim_testcases, trim);
 }
 
+int test_trim_leading()
+{
+    cout << "trim_leading()" << endl;
+    return test(trim_leading_testcases, n_trim_leading_testcases, trim_leading);
+}
+
+int test_trim_trailing()
+{
+    cout << "trim_trailing()" << endl;
+    return test(trim_trailing_testcases, n_trim_trailing_testcases, trim_trailing);
+}
+
 }
 
 int main(int argc, char* argv[])
 {
     int rv = 0;
 
-    rv += test1();
+    rv += test_trim();
+    rv += test_trim_leading();
+    rv += test_trim_trailing();
 
     return rv;
 }

server/core/utils.c

@@ -433,13 +433,24 @@ bool mxs_mkdir_all(const char *path, int mask)
     return mkdir_all_internal(local_path, (mode_t)mask);
 }
 
-/**
- * Trim leading and trailing whitespace from a string
- *
- * @param str String to trim
- * @return    Trimmed string
- */
-char* trim(char *str)
+char* trim_leading(char* str)
+{
+    char* ptr = str;
+
+    while (isspace(*ptr))
+    {
+        ptr++;
+    }
+
+    if (ptr != str)
+    {
+        memmove(str, ptr, strlen(ptr) + 1);
+    }
+
+    return str;
+}
+
+char* trim_trailing(char* str)
 {
     char* ptr = strchr(str, '\0') - 1;
 
@@ -453,21 +464,14 @@ char* trim(char *str)
         *(ptr + 1) = '\0';
     }
 
-    ptr = str;
-
-    while (isspace(*ptr))
-    {
-        ptr++;
-    }
-
-    if (ptr != str)
-    {
-        memmove(str, ptr, strlen(ptr) + 1);
-    }
-
     return str;
 }
 
+char* trim(char *str)
+{
+    return trim_leading(trim_trailing(str));
+}
+
 /**
  * Replace all whitespace with spaces and squeeze repeating whitespace characters
  *