strbuf.c: added strbuf_explode

src/strbuf.c

@@ -71,6 +71,18 @@ void strbuf_free(strbuf_t *s) {
     strbuf_init(s);
 }
 
+void strbuf_free_list(strbuf_t **s) {
+
+    strbuf_t **list = s;
+
+    while(*s) {
+        if ((*s)->alloc_size)
+            xfree((*s)->buf);
+        xfree(*s++);
+    }
+    xfree(list);
+}
+
 void strbuf_attach(strbuf_t *s, void *buf, size_t len, size_t alloc_size) {
 
     strbuf_free(s);
@@ -184,3 +196,28 @@ void strbuf_squeeze(strbuf_t *s, char ch) {
         }
     }
 }
+
+strbuf_t** strbuf_explode(const strbuf_t *s, char sep) {
+
+    int i = 0, count = 2;
+    char *p;
+    strbuf_t *tmp, **list;
+
+    list = xmallocz(sizeof(strbuf_t *) * count);
+    
+    p = s->buf;
+    while(p < s->buf + s->len) {
+        char *d = memchr(p, sep, s->len - (p - s->buf));
+        if (!d)
+            d = s->buf + s->len;
+        if (i + 1 >= count)
+            list = xrealloc(list, sizeof(strbuf_t *) * (count += 4));
+        tmp = xmalloc(sizeof(strbuf_t));
+        strbuf_init(tmp);
+        strbuf_append(tmp, p, d - p);
+        list[i] = tmp;
+        list[++i] = NULL;
+        p = ++d;
+    }
+    return list;
+}

src/strbuf.h

@@ -33,6 +33,8 @@ char* strbuf_release(strbuf_t *s);
 
 void strbuf_free(strbuf_t *s);
 
+void strbuf_free_list(strbuf_t **s);
+
 void strbuf_attach(strbuf_t *s, void *str, size_t len, size_t alloc_size);
 
 void strbuf_append(strbuf_t *s, const void *ptr, size_t len);
@@ -57,4 +59,6 @@ void strbuf_rev(strbuf_t *s);
 
 void strbuf_squeeze(strbuf_t *s, char ch);
 
+strbuf_t **strbuf_explode(const strbuf_t *s, char sep);
+
 #endif /* __STRBUF_H */

test/t_strbuf.c

@@ -161,6 +161,27 @@ void test_reduce() {
     strbuf_free(&b);
 }
 
+void test_explode() {
+
+    strbuf_t **list, **ptr;
+    strbuf_t b = STRBUF_INIT;
+
+    strbuf_append_str(&b, "item1,item2,item3,item4");
+
+    list = ptr = strbuf_explode(&b, ',');
+    while(*ptr)
+        print_strbuf(*ptr++);
+    strbuf_free_list(list);
+
+    strbuf_free(&b);
+
+    list = strbuf_explode(&b, ',');
+
+    assert(*list == NULL);
+
+    strbuf_free_list(list);
+}
+
 void test_free_empty() {
 
     strbuf_t b = STRBUF_INIT;
@@ -178,6 +199,7 @@ int main() {
     test_trim();
     test_term();
     test_chop();
+    test_explode();
     test_free_empty();
     
     return 0;