add -p: improve error messages

diff --git a/strbuf.c b/strbuf.c
index 323c49ceb35cb053434248df869578e649ccadc0..1df674e9194ee6d5cd5386f477745ff6639b7b65 100644 (file)
--- a/strbuf.c
+++ b/strbuf.c
@@ -11,6 +11,28 @@ int starts_with(const char *str, const char *prefix)
                        return 0;
 }
 
+int skip_to_optional_arg_default(const char *str, const char *prefix,
+                                const char **arg, const char *def)
+{
+       const char *p;
+
+       if (!skip_prefix(str, prefix, &p))
+               return 0;
+
+       if (!*p) {
+               if (arg)
+                       *arg = def;
+               return 1;
+       }
+
+       if (*p != '=')
+               return 0;
+
+       if (arg)
+               *arg = p + 1;
+       return 1;
+}
+
 /*
  * Used as the default ->buf value, so that people can always assume
  * buf is non NULL and ->buf is NUL terminated even for a freshly
@@ -386,12 +408,15 @@ ssize_t strbuf_read(struct strbuf *sb, int fd, size_t hint)
 
 ssize_t strbuf_read_once(struct strbuf *sb, int fd, size_t hint)
 {
+       size_t oldalloc = sb->alloc;
        ssize_t cnt;
 
        strbuf_grow(sb, hint ? hint : 8192);
        cnt = xread(fd, sb->buf + sb->len, sb->alloc - sb->len - 1);
        if (cnt > 0)
                strbuf_setlen(sb, sb->len + cnt);
+       else if (oldalloc == 0)
+               strbuf_release(sb);
        return cnt;
 }
 
@@ -658,7 +683,7 @@ static void strbuf_add_urlencode(struct strbuf *sb, const char *s, size_t len,
                    (!reserved && is_rfc3986_reserved(ch)))
                        strbuf_addch(sb, ch);
                else
-                       strbuf_addf(sb, "%%%02x", ch);
+                       strbuf_addf(sb, "%%%02x", (unsigned char)ch);
        }
 }