gui: Use variable-sized input buffer for the audiod pipe.

[paraslash.git] / string.c

diff --git a/string.c b/string.c
index f51f3574f0cf372bdd8febb5ac517c45e3d92d59..51985404817d032261d0f19ba2ebce35682156dd 100644 (file)
--- a/string.c
+++ b/string.c
@@ -200,15 +200,15 @@ __must_check __malloc char *para_dirname(const char *name)
  * ends with a slash.  Otherwise, a pointer within \a name is returned.  Caller
  * must not free the result.
  */
-__must_check const char *para_basename(const char *name)
+__must_check char *para_basename(const char *name)
 {
-       const char *ret;
+       char *ret;
 
        if (!name || !*name)
                return NULL;
        ret = strrchr(name, '/');
        if (!ret)
-               return name;
+               return (char *)name;
        ret++;
        return ret;
 }
@@ -231,27 +231,6 @@ void chop(char *buf)
                buf[n - 1] = '\0';
 }
 
-/**
- * Get a random filename.
- *
- * This is by no means a secure way to create temporary files in a hostile
- * directory like \p /tmp. However, it is OK to use for temp files, fifos,
- * sockets that are created in ~/.paraslash. Result must be freed by the
- * caller.
- *
- * \return A pointer to a random filename.
- */
-__must_check __malloc char *para_tmpname(void)
-{
-       struct timeval now;
-       unsigned int seed;
-
-       gettimeofday(&now, NULL);
-       seed = now.tv_usec;
-       srand(seed);
-       return make_message("%08i", rand());
-}
-
 /**
  * Get the logname of the current user.
  *
@@ -457,6 +436,40 @@ int for_each_line_ro(char *buf, size_t size, line_handler_t *line_handler,
                private_data);
 }
 
+#define hex(a) (hexchar[(a) & 15])
+static void write_size_header(char *buf, int n)
+{
+       static char hexchar[] = "0123456789abcdef";
+
+       buf[0] = hex(n >> 12);
+       buf[1] = hex(n >> 8);
+       buf[2] = hex(n >> 4);
+       buf[3] = hex(n);
+       buf[4] = ' ';
+}
+
+int read_size_header(const char *buf)
+{
+       int i, len = 0;
+
+       for (i = 0; i < 4; i++) {
+               unsigned char c = buf[i];
+               len <<= 4;
+               if (c >= '0' && c <= '9') {
+                       len += c - '0';
+                       continue;
+               }
+               if (c >= 'a' && c <= 'f') {
+                       len += c - 'a' + 10;
+                       continue;
+               }
+               return -E_SIZE_PREFIX;
+       }
+       if (buf[4] != ' ')
+               return -E_SIZE_PREFIX;
+       return len;
+}
+
 /**
  * Safely print into a buffer at a given offset.
  *
@@ -472,7 +485,8 @@ int for_each_line_ro(char *buf, size_t size, line_handler_t *line_handler,
  * private_data pointer of \a b are passed to the \a max_size_handler of \a b.
  * If this function succeeds, i.e. returns a non-negative value, the offset of
  * \a b is reset to zero and the given data is written to the beginning of the
- * buffer.
+ * buffer. If \a max_size_handler() returns a negative value, this value is
+ * returned by \a para_printf().
  *
  * Upon return, the offset of \a b is adjusted accordingly so that subsequent
  * calls to this function append data to what is already contained in the
@@ -482,13 +496,15 @@ int for_each_line_ro(char *buf, size_t size, line_handler_t *line_handler,
  * initial buffer is allocated.
  *
  * \return The number of bytes printed into the buffer (not including the
- * terminating \p NULL byte).
+ * terminating \p NULL byte) on success, negative on errors. If there is no
+ * size-bound on \a b, i.e. if \p b->max_size is zero, this function never
+ * fails.
  *
  * \sa make_message(), vsnprintf(3).
  */
 __printf_2_3 int para_printf(struct para_buffer *b, const char *fmt, ...)
 {
-       int ret;
+       int ret, sz_off = (b->flags & PBF_SIZE_PREFIX)? 5 : 0;
 
        if (!b->buf) {
                b->buf = para_malloc(128);
@@ -499,13 +515,16 @@ __printf_2_3 int para_printf(struct para_buffer *b, const char *fmt, ...)
                char *p = b->buf + b->offset;
                size_t size = b->size - b->offset;
                va_list ap;
-               if (size) {
+
+               if (size > sz_off) {
                        va_start(ap, fmt);
-                       ret = vsnprintf(p, size, fmt, ap);
+                       ret = vsnprintf(p + sz_off, size - sz_off, fmt, ap);
                        va_end(ap);
-                       if (ret > -1 && ret < size) { /* success */
-                               b->offset += ret;
-                               return ret;
+                       if (ret > -1 && ret < size - sz_off) { /* success */
+                               b->offset += ret + sz_off;
+                               if (sz_off)
+                                       write_size_header(p, ret);
+                               return ret + sz_off;
                        }
                }
                /* check if we may grow the buffer */