strbuf: docs and const pointers.

docs/strbuf.txt

@@ -28,6 +28,14 @@ strbuf_append():
 Like strncat() this function will append the buffer with the contents of 'str'
 and will always copy exactly 'len' bytes. (if memory can be obtained ofcourse)
 
+strbuf_append_str():
+
+Will add the C-string to the end of ->buf
+
+strbuf_append_ch():
+
+Adds one character 'ch' to the end of ->buf
+
 strbuf_reduce():
 
 Will reduce ->buf by 'len' bytes from the end, Note that this don't shrink the memory block
@@ -43,6 +51,10 @@ strbuf_rev():
 
 Reverses the ->buf string.
 
+strbuf_squeeze():
+
+Squeezes "together" sequences of 'ch' into one character.
+
 strbuf_release():
 
 This function should be used to detach the ->buf member from the strbuf_t structure.

src/common/strbuf.c

@@ -89,7 +89,7 @@ void strbuf_free(strbuf_t *s) {
     strbuf_init(s);
 }
 
-void strbuf_append(strbuf_t *s, void *ptr, size_t len) {
+void strbuf_append(strbuf_t *s, const void *ptr, size_t len) {
 
     strbuf_expand(s, len);
     memcpy(s->buf + s->len, ptr, len);
@@ -97,7 +97,7 @@ void strbuf_append(strbuf_t *s, void *ptr, size_t len) {
     s->buf[s->len] = '\0';
 }
 
-void strbuf_append_str(strbuf_t *s, char *str) {
+void strbuf_append_str(strbuf_t *s, const char *str) {
 
     strbuf_append(s, str, strlen(str));
 }
@@ -157,7 +157,7 @@ void strbuf_squeeze(strbuf_t *s, char ch) {
 
         size_t np = p, of = 0;
         
-        for(; np >= 1 && s->buf[np-1] == ch; np--)
+        for(; np && s->buf[np-1] == ch; np--)
             of++;
         for(s->len -= of; np <= s->len; np++)
             s->buf[np] = s->buf[np + of];

src/common/strbuf.h

@@ -33,9 +33,9 @@ char* strbuf_release(strbuf_t *s);
 
 void strbuf_free(strbuf_t *s);
 
-void strbuf_append(strbuf_t *s, void *ptr, size_t len);
+void strbuf_append(strbuf_t *s, const void *ptr, size_t len);
 
-void strbuf_append_str(strbuf_t *s, char *str);
+void strbuf_append_str(strbuf_t *s, const char *str);
 
 void strbuf_append_ch(strbuf_t *s, char ch);