117 lines
4.0 KiB
C
117 lines
4.0 KiB
C
/*
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* Copyright (C) 2022-2024 Jordan Bancino <@jordan:bancino.net>
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation files
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* (the "Software"), to deal in the Software without restriction,
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* including without limitation the rights to use, copy, modify, merge,
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* publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#ifndef CYTOPLASM_UTIL_H
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#define CYTOPLASM_UTIL_H
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/***
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* @Nm Util
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* @Nd Some misc. helper functions that don't need their own headers.
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* @Dd February 15 2023
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*
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* This header holds a number of random functions related to strings,
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* time, the filesystem, and other simple tasks that don't require a
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* full separate API. For the most part, the functions here are
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* entirely standalone, depending only on POSIX functions, however
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* there are a few that depend explicitly on a few other APIs. Those
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* are noted.
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*/
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#include <stdio.h>
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#include <stddef.h>
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#include <sys/types.h>
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#include "Stream.h"
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/**
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* Get the current timestamp in milliseconds since the Unix epoch. This
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* uses
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* .Xr gettimeofday 2
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* and time_t, and converts it to a single number, which is then
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* returned to the caller.
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* .Pp
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* A note on the 2038 problem: as long as sizeof(time_t) >= 8, that is,
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* as long as the time_t type is 64 bits or more, then everything
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* should be fine. On most, if not, all, 64-bit systems, time_t is 64
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* bits. time_t is promoted to a 64-bit integer before it is converted
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* to milliseconds, so there is no risk of overflue due to the
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* multiplication by 1000. However, if time_t is only 32 bits, it will
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* overflow before it even gets to this function, which will cause this
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* function to produce unexpected results.
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*/
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extern uint64_t UtilTsMillis(void);
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/**
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* Use
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* .Xr stat 2
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* to get the last modified time of the given file, or zero if there
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* was an error getting the last modified time of a file. This is
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* primarily useful for caching file data.
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*/
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extern uint64_t UtilLastModified(char *);
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/**
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* This function behaves just like the system call
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* .Xr mkdir 2 ,
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* but it creates any intermediate directories as necessary, unlike
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* .Xr mkdir 2 .
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*/
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extern int UtilMkdir(const char *, const mode_t);
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/**
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* Sleep the calling thread for the given number of milliseconds.
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* POSIX does not have a very friendly way to sleep, so this wraps
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* .Xr nanosleep 2
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* to make its usage much, much simpler.
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*/
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extern int UtilSleepMillis(uint64_t);
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/**
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* This function works identically to the POSIX
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* .Xr getdelim 3 ,
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* except that it assumes pointers were allocated with the Memory API
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* and it reads from a Stream instead of a file pointer.
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*/
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extern ssize_t UtilGetDelim(char **, size_t *, int, Stream *);
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/**
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* This function is just a special case of
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* .Fn UtilGetDelim
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* that sets the delimiter to the newline character.
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*/
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extern ssize_t UtilGetLine(char **, size_t *, Stream *);
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/**
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* Get a unique number associated with the current thread.
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* Numbers are assigned in the order that threads call this
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* function, but are guaranteed to be unique in identifying
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* the thread in a more human-readable way than just casting
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* the return value of
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* .Fn pthread_self
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* to a number.
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*/
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extern uint32_t UtilThreadNo(void);
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#endif /* CYTOPLASM_UTIL_H */
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