58 lines
1.4 KiB
C
58 lines
1.4 KiB
C
//
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// utils.c
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// Copyright 2021 Bruce Hill
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// Released under the MIT license with the Commons Clause
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//
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// This file contains implementations of some convenience functions for more
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// easily error checking.
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//
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#include <err.h>
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#include <stdarg.h>
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#include <stdlib.h>
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//
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// If the given argument is nonnegative, print the error message and exit with
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// failure. Otherwise, return the given argument.
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//
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int check_nonnegative(int negative_err, const char *err_msg, ...)
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{
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if (negative_err < 0) {
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va_list args;
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va_start(args, err_msg);
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verr(EXIT_FAILURE, err_msg, args);
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va_end(args);
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}
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return negative_err;
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}
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//
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// If the given argument is NULL, print the error message and exit with
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// failure. Otherwise return the given argument.
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//
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void *check_nonnull(void *p, const char *err_msg, ...)
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{
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if (p == NULL) {
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va_list args;
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va_start(args, err_msg);
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verr(EXIT_FAILURE, err_msg, args);
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va_end(args);
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}
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return p;
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}
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//
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// For a given pointer to a memory-allocated pointer, free its memory and set
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// the pointer to NULL. (This is a safer alternative to free() that
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// automatically NULLs out the pointer so it can't be used after freeing)
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//
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void delete(void *p)
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{
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if (*(void**)p != NULL) {
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free(*(void**)p);
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*(void**)p = NULL;
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}
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}
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// vim: ts=4 sw=0 et cino=L2,l1,(0,W4,m1
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