--- /dev/null
+// Copyright 2017 Google Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "internal/string_view.h"
+
+#include <assert.h>
+#include <ctype.h>
+#include <string.h>
+
+int CpuFeatures_StringView_IndexOfChar(const StringView view, char c) {
+ if (view.ptr && view.size) {
+ const char* const found = (const char*)memchr(view.ptr, c, view.size);
+ if (found) {
+ return found - view.ptr;
+ }
+ }
+ return -1;
+}
+
+int CpuFeatures_StringView_IndexOf(const StringView view,
+ const StringView sub_view) {
+ if (sub_view.size) {
+ StringView remainder = view;
+ while (remainder.size >= sub_view.size) {
+ const int found_index =
+ CpuFeatures_StringView_IndexOfChar(remainder, sub_view.ptr[0]);
+ if (found_index < 0) break;
+ remainder = CpuFeatures_StringView_PopFront(remainder, found_index);
+ if (CpuFeatures_StringView_StartsWith(remainder, sub_view)) {
+ return remainder.ptr - view.ptr;
+ }
+ remainder = CpuFeatures_StringView_PopFront(remainder, 1);
+ }
+ }
+ return -1;
+}
+
+bool CpuFeatures_StringView_IsEquals(const StringView a, const StringView b) {
+ if (a.size == b.size) {
+ return a.ptr == b.ptr || memcmp(a.ptr, b.ptr, b.size) == 0;
+ }
+ return false;
+}
+
+bool CpuFeatures_StringView_StartsWith(const StringView a, const StringView b) {
+ return a.ptr && b.ptr && b.size && a.size >= b.size
+ ? memcmp(a.ptr, b.ptr, b.size) == 0
+ : false;
+}
+
+StringView CpuFeatures_StringView_PopFront(const StringView str_view,
+ size_t count) {
+ if (count > str_view.size) {
+ return kEmptyStringView;
+ }
+ return view(str_view.ptr + count, str_view.size - count);
+}
+
+StringView CpuFeatures_StringView_PopBack(const StringView str_view,
+ size_t count) {
+ if (count > str_view.size) {
+ return kEmptyStringView;
+ }
+ return view(str_view.ptr, str_view.size - count);
+}
+
+StringView CpuFeatures_StringView_KeepFront(const StringView str_view,
+ size_t count) {
+ return count <= str_view.size ? view(str_view.ptr, count) : str_view;
+}
+
+char CpuFeatures_StringView_Front(const StringView view) {
+ assert(view.size);
+ assert(view.ptr);
+ return view.ptr[0];
+}
+
+char CpuFeatures_StringView_Back(const StringView view) {
+ assert(view.size);
+ return view.ptr[view.size - 1];
+}
+
+StringView CpuFeatures_StringView_TrimWhitespace(StringView view) {
+ while (view.size && isspace(CpuFeatures_StringView_Front(view)))
+ view = CpuFeatures_StringView_PopFront(view, 1);
+ while (view.size && isspace(CpuFeatures_StringView_Back(view)))
+ view = CpuFeatures_StringView_PopBack(view, 1);
+ return view;
+}
+
+static int HexValue(const char c) {
+ if (c >= '0' && c <= '9') return c - '0';
+ if (c >= 'a' && c <= 'f') return c - 'a' + 10;
+ if (c >= 'A' && c <= 'F') return c - 'A' + 10;
+ return -1;
+}
+
+// Returns -1 if view contains non digits.
+static int ParsePositiveNumberWithBase(const StringView view, int base) {
+ int result = 0;
+ StringView remainder = view;
+ for (; remainder.size;
+ remainder = CpuFeatures_StringView_PopFront(remainder, 1)) {
+ const int value = HexValue(CpuFeatures_StringView_Front(remainder));
+ if (value < 0 || value >= base) return -1;
+ result = (result * base) + value;
+ }
+ return result;
+}
+
+int CpuFeatures_StringView_ParsePositiveNumber(const StringView view) {
+ if (view.size) {
+ const StringView hex_prefix = str("0x");
+ if (CpuFeatures_StringView_StartsWith(view, hex_prefix)) {
+ const StringView span_no_prefix =
+ CpuFeatures_StringView_PopFront(view, hex_prefix.size);
+ return ParsePositiveNumberWithBase(span_no_prefix, 16);
+ }
+ return ParsePositiveNumberWithBase(view, 10);
+ }
+ return -1;
+}
+
+void CpuFeatures_StringView_CopyString(const StringView src, char* dst,
+ size_t dst_size) {
+ if (dst_size > 0) {
+ const size_t max_copy_size = dst_size - 1;
+ const size_t copy_size =
+ src.size > max_copy_size ? max_copy_size : src.size;
+ memcpy(dst, src.ptr, copy_size);
+ dst[copy_size] = '\0';
+ }
+}
+
+bool CpuFeatures_StringView_HasWord(const StringView line,
+ const char* const word_str) {
+ const StringView word = str(word_str);
+ StringView remainder = line;
+ for (;;) {
+ const int index_of_word = CpuFeatures_StringView_IndexOf(remainder, word);
+ if (index_of_word < 0) {
+ return false;
+ } else {
+ const StringView before =
+ CpuFeatures_StringView_KeepFront(line, index_of_word);
+ const StringView after =
+ CpuFeatures_StringView_PopFront(line, index_of_word + word.size);
+ const bool valid_before =
+ before.size == 0 || CpuFeatures_StringView_Back(before) == ' ';
+ const bool valid_after =
+ after.size == 0 || CpuFeatures_StringView_Front(after) == ' ';
+ if (valid_before && valid_after) return true;
+ remainder =
+ CpuFeatures_StringView_PopFront(remainder, index_of_word + word.size);
+ }
+ }
+ return false;
+}
+
+bool CpuFeatures_StringView_GetAttributeKeyValue(const StringView line,
+ StringView* key,
+ StringView* value) {
+ const StringView sep = str(": ");
+ const int index_of_separator = CpuFeatures_StringView_IndexOf(line, sep);
+ if (index_of_separator < 0) return false;
+ *value = CpuFeatures_StringView_TrimWhitespace(
+ CpuFeatures_StringView_PopFront(line, index_of_separator + sep.size));
+ *key = CpuFeatures_StringView_TrimWhitespace(
+ CpuFeatures_StringView_KeepFront(line, index_of_separator));
+ return true;
+}
Code Review / iec.git / blobdiff