+
+bool
+_mesa_string_buffer_append_all(struct _mesa_string_buffer *str,
+ uint32_t num_args, ...)
+{
+ int i;
+ char* s;
+ va_list args;
+ va_start(args, num_args);
+ for (i = 0; i < num_args; i++) {
+ s = va_arg(args, char*);
+ if (!_mesa_string_buffer_append_len(str, s, strlen(s)))
+ return false;
+ }
+ va_end(args);
+ return true;
+}
+
+bool
+_mesa_string_buffer_append_len(struct _mesa_string_buffer *str,
+ char *c, uint32_t len)
+{
+ uint32_t needed_length = str->length + len + 1;
+ if (!ensure_capacity(str, needed_length))
+ return false;
+
+ memcpy(str->buf + str->length, c, len);
+ str->length += len;
+ str->buf[str->length] = '\0';
+ return true;
+}
+
+void
+_mesa_string_buffer_clear(struct _mesa_string_buffer *str)
+{
+ str->length = 0;
+ str->buf[str->length] = '\0';
+}
+
+uint32_t
+_mesa_string_buffer_space_left(struct _mesa_string_buffer *str)
+{
+ return str->capacity - str->length - 1;
+}
+
+bool
+_mesa_string_buffer_vprintf(struct _mesa_string_buffer *str,
+ const char *format, va_list args)
+{
+ uint32_t len;
+ uint32_t end = str->length;
+
+#if (defined(_MSC_VER) && _MSC_VER < 1900) || __MINGW32__
+ /* MSVC up to 2013 used non-standard vsnprintf() that returned -1
+ * if the buffer wasn't large enough. Another non-standard function
+ * _vscprintf() should be used to measure length of printf() output.
+ */
+ len = _vscprintf(format, args);
+
+ /* Fail if an error happened in vscprintf() */
+ if (unlikely(len < 0))
+ return false;
+
+ len = vsprintf(str->buf + end, format, args);
+ str->length += len;
+ return len >= 0;
+
+#else
+ uint32_t size = MAX2(100, _mesa_string_buffer_space_left(str));
+ while (1) {
+ ensure_capacity(str, end + size + 1);
+ len = vsnprintf(str->buf + end, size, format, args);
+
+ /* Fail if an error happened in vsnprintf()
+ * or if measured len overflows size_t
+ */
+ if (unlikely(len < 0 || str->length + len + 1 < str->length))
+ return false;
+
+ /* There was enough room for the string, so we're done */
+ if (len < size) {
+ str->length += len;
+ return true;
+ }
+
+ /* Formatted string is too large for the buffer.
+ * Increase the size and print again.
+ */
+ size = MAX2(size * 2, str->length + len);
+ }
+#endif
+
+}
+
+bool
+_mesa_string_buffer_printf(struct _mesa_string_buffer *str,
+ const char *format, ...)
+{
+ bool res;
+ va_list args;
+ va_start(args, format);
+ res = _mesa_string_buffer_vprintf(str, format, args);
+ va_end(args);
+ return res;
+}
diff --git a/src/util/string_buffer.h b/src/util/string_buffer.h
new file mode 100644
index 0000000000..f03e7841f3
--- /dev/null
+++ b/src/util/string_buffer.h
@@ -0,0 +1,75 @@
+/*
+ * Copyright © 2017 Thomas Helland
+ *
+ * Permission is hereby granted, free of charge, to any person
obtaining a
+ * copy of this software and associated documentation files (the
"Software"),
+ * to deal in the Software without restriction, including without
limitation
+ * the rights to use, copy, modify, merge, publish, distribute,
sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including
the next
+ * paragraph) shall be included in all copies or substantial portions
of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES
OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ */
+#ifndef _STRING_BUFFER_H
+#define _STRING_BUFFER_H
+
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+
+struct _mesa_string_buffer {
+ char *buf;
+ uint32_t length;
+ uint32_t capacity;
+};
+
+struct _mesa_string_buffer *
+_mesa_string_buffer_create(void *mem_ctx, uint32_t initial_capacity);
+
+void
+_mesa_string_buffer_destroy(struct _mesa_string_buffer *str);
+
+bool
+_mesa_string_buffer_append(struct _mesa_string_buffer *str, char *c);
+
+bool
+_mesa_string_buffer_append_all(struct _mesa_string_buffer *str,
+ uint32_t num_args, ...);
+bool
+_mesa_string_buffer_append_len(struct _mesa_string_buffer *str,
+ char *c, uint32_t len);
+
+static inline bool
+_mesa_string_buffer_append_char(struct _mesa_string_buffer *str, char c)
+{
+ assert(str->capacity > 0 && ch != '\0');
+ return _mesa_string_buffer_append_len(str, &c, 1);
+}
+
+void
+_mesa_string_buffer_clear(struct _mesa_string_buffer *str);
+
+uint32_t
+_mesa_string_buffer_space_left(struct _mesa_string_buffer *str);
+
+bool
+_mesa_string_buffer_vprintf(struct _mesa_string_buffer *str,
+ const char *format, va_list args);
+
+bool
+_mesa_string_buffer_printf(struct _mesa_string_buffer *str,
+ const char *format, ...);
+
+#endif /* _STRING_BUFFER_H */
