From 6bdbb45e88e7b88b294dfb6e4cb493cbc3c8cf74 Mon Sep 17 00:00:00 2001
From: Joshua Haberman <joshua@reverberate.org>
Date: Sun, 13 Feb 2011 12:59:54 -0800
Subject: Merged core/ and stream/ -> src/.  The split wasn't worth it.

---
 src/upb_string.c | 143 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 143 insertions(+)
 create mode 100644 src/upb_string.c

(limited to 'src/upb_string.c')

diff --git a/src/upb_string.c b/src/upb_string.c
new file mode 100644
index 0000000..30ed88f
--- /dev/null
+++ b/src/upb_string.c
@@ -0,0 +1,143 @@
+/*
+ * upb - a minimalist implementation of protocol buffers.
+ *
+ * Copyright (c) 2010 Joshua Haberman.  See LICENSE for details.
+ */
+
+#include "upb_string.h"
+
+#include <stdlib.h>
+#ifdef __GLIBC__
+#include <malloc.h>
+#elif defined(__APPLE__)
+#include <malloc/malloc.h>
+#endif
+
+static uint32_t upb_round_up_pow2(uint32_t v) {
+  // http://graphics.stanford.edu/~seander/bithacks.html#RoundUpPowerOf2
+  v--;
+  v |= v >> 1;
+  v |= v >> 2;
+  v |= v >> 4;
+  v |= v >> 8;
+  v |= v >> 16;
+  v++;
+  return v;
+}
+
+upb_string *upb_string_new() {
+  upb_string *str = malloc(sizeof(*str));
+  str->ptr = NULL;
+  str->cached_mem = NULL;
+  str->len = 0;
+#ifndef UPB_HAVE_MSIZE
+  str->size = 0;
+#endif
+  str->src = NULL;
+  upb_atomic_refcount_init(&str->refcount, 1);
+  return str;
+}
+
+uint32_t upb_string_size(upb_string *str) {
+#ifdef __GLIBC__
+  return malloc_usable_size(str->cached_mem);
+#elif defined(__APPLE__)
+  return malloc_size(str->cached_mem);
+#else
+  return str->size;
+#endif
+}
+
+void _upb_string_free(upb_string *str) {
+  free(str->cached_mem);
+  _upb_string_release(str);
+  free(str);
+}
+
+char *upb_string_getrwbuf(upb_string *str, upb_strlen_t len) {
+  // assert(str->ptr == NULL);
+  upb_strlen_t size = upb_string_size(str);
+  if (size < len) {
+    size = upb_round_up_pow2(len);
+    str->cached_mem = realloc(str->cached_mem, size);
+#ifndef UPB_HAVE_MSIZE
+    str->size = size;
+#endif
+  }
+  str->len = len;
+  str->ptr = str->cached_mem;
+  return str->cached_mem;
+}
+
+void upb_string_substr(upb_string *str, upb_string *target_str,
+                       upb_strlen_t start, upb_strlen_t len) {
+  if(str->ptr) *(char*)0 = 0;
+  assert(str->ptr == NULL);
+  str->src = upb_string_getref(target_str);
+  str->ptr = upb_string_getrobuf(target_str) + start;
+  str->len = len;
+}
+
+void upb_string_vprintf(upb_string *str, const char *format, va_list args) {
+  // Try once without reallocating.  We have to va_copy because we might have
+  // to call vsnprintf again.
+  uint32_t size = UPB_MAX(upb_string_size(str), 16);
+  char *buf = upb_string_getrwbuf(str, size);
+  va_list args_copy;
+  va_copy(args_copy, args);
+  uint32_t true_size = vsnprintf(buf, size, format, args_copy);
+  va_end(args_copy);
+
+  if (true_size >= size) {
+    // Need to reallocate.  We reallocate even if the sizes were equal,
+    // because snprintf excludes the terminating NULL from its count.
+    // We don't care about the terminating NULL, but snprintf might
+    // bail out of printing even other characters if it doesn't have
+    // enough space to write the NULL also.
+    upb_string_recycle(&str);
+    buf = upb_string_getrwbuf(str, true_size + 1);
+    vsnprintf(buf, true_size + 1, format, args);
+  }
+  str->len = true_size;
+}
+
+upb_string *upb_string_asprintf(const char *format, ...) {
+  upb_string *str = upb_string_new();
+  va_list args;
+  va_start(args, format);
+  upb_string_vprintf(str, format, args);
+  va_end(args);
+  return str;
+}
+
+upb_string *upb_strdup(upb_string *s) {
+  upb_string *str = upb_string_new();
+  upb_strcpy(str, s);
+  return str;
+}
+
+void upb_strcat(upb_string *s, upb_string *append) {
+  uint32_t old_size = upb_string_len(s);
+  uint32_t append_size = upb_string_len(append);
+  uint32_t new_size = old_size + append_size;
+  char *buf = upb_string_getrwbuf(s, new_size);
+  memcpy(buf + old_size, upb_string_getrobuf(append), append_size);
+}
+
+upb_string *upb_strreadfile(const char *filename) {
+  FILE *f = fopen(filename, "rb");
+  if(!f) return NULL;
+  if(fseek(f, 0, SEEK_END) != 0) goto error;
+  long size = ftell(f);
+  if(size < 0) goto error;
+  if(fseek(f, 0, SEEK_SET) != 0) goto error;
+  upb_string *s = upb_string_new();
+  char *buf = upb_string_getrwbuf(s, size);
+  if(fread(buf, size, 1, f) != 1) goto error;
+  fclose(f);
+  return s;
+
+error:
+  fclose(f);
+  return NULL;
+}
-- 
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