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83 lines
2.9 KiB
C
83 lines
2.9 KiB
C
/*
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Copyright (c) 2017-2019, Feral Interactive
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of Feral Interactive nor the names of its contributors
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may be used to endorse or promote products derived from this software
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without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <string.h>
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#include <sys/param.h>
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#include <unistd.h>
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/**
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* Value clamping helper, works like MIN/MAX but constraints a value within the range.
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*/
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#define CLAMP(l, u, value) MAX(MIN(l, u), MIN(MAX(l, u), value))
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/**
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* Little helper to safely print into a buffer, returns a pointer into the buffer
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*/
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#define buffered_snprintf(b, s, ...) \
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(snprintf(b, sizeof(b), s, __VA_ARGS__) < (ssize_t)sizeof(b) ? b : NULL)
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/**
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* Little helper to safely print into a buffer, returns a newly allocated string
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*/
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#define safe_snprintf(b, s, ...) \
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(snprintf(b, sizeof(b), s, __VA_ARGS__) < (ssize_t)sizeof(b) ? strndup(b, sizeof(b)) : NULL)
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/**
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* Helper function: Test, if haystack ends with needle.
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*/
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static inline const char *strtail(const char *haystack, const char *needle)
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{
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char *pos = strstr(haystack, needle);
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if (pos && (strlen(pos) == strlen(needle)))
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return pos;
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return NULL;
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}
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/**
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* Helper function for autoclosing file-descriptors. Does nothing if the argument
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* is NULL or the referenced integer < 0.
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*/
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inline void cleanup_close(int *fd_ptr)
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{
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if (fd_ptr == NULL || *fd_ptr < 0)
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return;
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(void)close(*fd_ptr);
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}
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/**
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* Helper macro for autoclosing file-descriptors: use by prefixing the variable,
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* like "autoclose_fd int fd = -1;".
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*/
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#define autoclose_fd __attribute__((cleanup(cleanup_close)))
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