common/strbuf: added chop function

src/common/strbuf.c

@@ -12,6 +12,7 @@
 #include <string.h>
 #include "xalloc.h"
 #include "strbuf.h"
+#include "debug.h"
 
 #define CHNK_SIZE 128
 
@@ -91,6 +92,20 @@ void strbuf_append_ch(strbuf_t *s, char ch) {
     s->buf[s->len] = '\0';
 }
 
+void strbuf_rchop(strbuf_t *s, char ch) {
+
+    int i;
+    
+    for(i=s->len-1; i >= 0; i--) {
+
+        if (s->buf[i] == ch) {
+            s->buf[i] = '\0';
+            s->len = i;
+            break;
+        }
+    }
+}
+
 void strbuf_term(strbuf_t *s, char ch) {
 
     if (s->buf[s->len-1] != ch)

src/common/strbuf.h

@@ -39,6 +39,8 @@ void strbuf_append_str(strbuf_t *s, const char *str);
 
 void strbuf_append_ch(strbuf_t *s, char ch);
 
+void strbuf_rchop(strbuf_t *s, char ch);
+
 void strbuf_term(strbuf_t *s, char ch);
 
 void strbuf_trim(strbuf_t *s);

test/t_strbuf.c

@@ -42,6 +42,29 @@ void test_squeeze() {
     strbuf_free(&b);
 }
 
+void test_chop() {
+
+    strbuf_t b = STRBUF_INIT;
+
+    strbuf_rchop(&b, 'X');
+    print_strbuf(&b);
+
+    strbuf_append_str(&b, "X");
+    
+    strbuf_rchop(&b, 'X');
+    print_strbuf(&b);
+
+    strbuf_append_str(&b, "123456789X123456789");
+
+    strbuf_rchop(&b, 'X');
+    print_strbuf(&b);
+
+    strbuf_rchop(&b, 'X');
+    print_strbuf(&b);
+    
+    strbuf_free(&b);
+}
+
 void test_term() {
 
     strbuf_t b = STRBUF_INIT;
@@ -109,6 +132,8 @@ int main() {
     test_squeeze();
 
     test_term();
+
+    test_chop();
     
     return 0;
 }