86 lines
2.9 KiB
C
86 lines
2.9 KiB
C
/*
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* Copyright (c) 2012-2013 Spotify AB
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may not
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* use this file except in compliance with the License. You may obtain a copy of
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* 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, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations under
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* the License.
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*/
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#ifndef SPARKEY_UTIL_H_INCLUDED
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#define SPARKEY_UTIL_H_INCLUDED
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include "sparkey.h"
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/**
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* This macro sort of behaves like a new keyword.
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* Input must be an expression that returns sparkey_returncode.
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* The macro must be executed in a function that returns sparkey_returncode.
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* If the expression evaluates to something else than SPARKEY_SUCCESS,
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* then the containing function returns that value directly.
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*/
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#define RETHROW(f) do { sparkey_returncode returncode = (f); if (returncode != SPARKEY_SUCCESS) return returncode; } while (0);
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/**
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* This macro requires that a sparkey_returncode returncode; is already defined in the function.
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* It evaluates the first argument which must return sparkey_returncode.
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* If that evaluates to something else than SPARKEY_SUCCESS,
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* it sets the returncode to that and jumps to the specified label.
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*/
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#define TRY(f, label) do { returncode = (f); if (returncode != SPARKEY_SUCCESS) goto label; } while (0);
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/**
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* Convert error codes generated by open and fopen into sparkey return codes.
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* @param e an error code
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* @returns a sparkey_returncode corresponding to the error, or SPARKEY_INTERNAL_ERROR
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*/
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sparkey_returncode sparkey_open_returncode(int e);
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/**
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* Convert error codes generated by creat into sparkey return codes.
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* @param e an error code
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* @returns a sparkey_returncode corresponding to the error, or SPARKEY_INTERNAL_ERROR
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*/
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sparkey_returncode sparkey_create_returncode(int e);
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/**
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* Convert error codes generated by remove or unlink into sparkey return codes.
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* @param e an error code
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* @returns a sparkey_returncode corresponding to the error, or SPARKEY_INTERNAL_ERROR
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*/
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sparkey_returncode sparkey_remove_returncode(int e);
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/**
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* Fetches a 32 bit unsigned value from a pseudorandom source.
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*
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* @param output a pointer to an uint32_t where the random value is written
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* @returns a sparkey_returncode SPARKEY_SUCCESS or, in case of error SPARKEY_INTERNAL_ERROR.
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*/
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static inline sparkey_returncode rand32(uint32_t *output) {
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int fd = open("/dev/urandom", O_RDONLY);
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if (fd < 0) {
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return SPARKEY_INTERNAL_ERROR;
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}
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int actual = read(fd, output, 4);
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close(fd);
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if (actual < 4) {
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return SPARKEY_INTERNAL_ERROR;
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}
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return SPARKEY_SUCCESS;
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}
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#endif
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