Add string trimming functions

This patch is submitted under X11

Author: pudelkoM

utils.c

@@ -104,3 +104,14 @@ int dsock_random(uint8_t *buf, size_t len, int64_t deadline) {
     return 0;
 }
 
+const char *dsock_lstrip(const char *string, char delim) {
+    const char *pos = string;
+    while(*pos && *pos == delim) ++pos;
+    return pos;
+}
+
+const char *dsock_rstrip(const char *string, char delim) {
+    const char *end = string + strlen(string) - 1;
+    while(end > string && *end == delim) --end;
+    return ++end;
+}

utils.h

@@ -29,6 +29,7 @@
 #include <stdlib.h>
 #include <stdint.h>
 #include <stdio.h>
+#include <string.h>
 
 #define dsock_concat(x,y) x##y
 
@@ -79,5 +80,11 @@ void dsock_putll(uint8_t *buf, uint64_t val);
 
 int dsock_random(uint8_t *buf, size_t len, int64_t deadline);
 
+/* Returns a pointer to the first character in string that is not delim */
+const char *dsock_lstrip(const char *string, char delim);
+
+/* Returns a pointer after the last character in string that is not delim */
+const char *dsock_rstrip(const char *string, char delim);
+
 #endif