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111 lines
4.0 KiB
C
111 lines
4.0 KiB
C
// Copyright 2017 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// A view over a piece of string. The view is not 0 terminated.
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#ifndef CPU_FEATURES_INCLUDE_INTERNAL_STRING_VIEW_H_
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#define CPU_FEATURES_INCLUDE_INTERNAL_STRING_VIEW_H_
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#include <stdbool.h>
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#include <stddef.h>
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#include <string.h>
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#include "cpu_features_macros.h"
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CPU_FEATURES_START_CPP_NAMESPACE
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typedef struct {
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const char* ptr;
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size_t size;
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} StringView;
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#ifdef __cplusplus
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static const StringView kEmptyStringView = {NULL, 0};
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#else
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static const StringView kEmptyStringView;
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#endif
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// Returns a StringView from the provided string.
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// Passing NULL is valid only if size is 0.
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static inline StringView view(const char* str, const size_t size) {
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StringView view;
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view.ptr = str;
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view.size = size;
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return view;
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}
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static inline StringView str(const char* str) { return view(str, strlen(str)); }
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// Returns the index of the first occurrence of c in view or -1 if not found.
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int CpuFeatures_StringView_IndexOfChar(const StringView view, char c);
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// Returns the index of the first occurrence of sub_view in view or -1 if not
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// found.
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int CpuFeatures_StringView_IndexOf(const StringView view,
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const StringView sub_view);
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// Returns whether a is equal to b (same content).
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bool CpuFeatures_StringView_IsEquals(const StringView a, const StringView b);
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// Returns whether a starts with b.
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bool CpuFeatures_StringView_StartsWith(const StringView a, const StringView b);
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// Removes count characters from the beginning of view or kEmptyStringView if
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// count if greater than view.size.
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StringView CpuFeatures_StringView_PopFront(const StringView str_view,
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size_t count);
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// Removes count characters from the end of view or kEmptyStringView if count if
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// greater than view.size.
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StringView CpuFeatures_StringView_PopBack(const StringView str_view,
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size_t count);
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// Keeps the count first characters of view or view if count if greater than
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// view.size.
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StringView CpuFeatures_StringView_KeepFront(const StringView str_view,
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size_t count);
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// Retrieves the first character of view. If view is empty the behavior is
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// undefined.
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char CpuFeatures_StringView_Front(const StringView view);
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// Retrieves the last character of view. If view is empty the behavior is
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// undefined.
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char CpuFeatures_StringView_Back(const StringView view);
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// Removes leading and tailing space characters.
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StringView CpuFeatures_StringView_TrimWhitespace(StringView view);
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// Convert StringView to positive integer. e.g. "42", "0x2a".
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// Returns -1 on error.
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int CpuFeatures_StringView_ParsePositiveNumber(const StringView view);
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// Copies src StringView to dst buffer.
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void CpuFeatures_StringView_CopyString(const StringView src, char* dst,
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size_t dst_size);
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// Checks if line contains the specified whitespace separated word.
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bool CpuFeatures_StringView_HasWord(const StringView line,
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const char* const word,
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const char separator);
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// Get key/value from line. key and value are separated by ": ".
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// key and value are cleaned up from leading and trailing whitespaces.
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bool CpuFeatures_StringView_GetAttributeKeyValue(const StringView line,
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StringView* key,
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StringView* value);
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CPU_FEATURES_END_CPP_NAMESPACE
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#endif // CPU_FEATURES_INCLUDE_INTERNAL_STRING_VIEW_H_
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