mirror of https://github.com/yshui/picom.git
52 lines
1.4 KiB
C
52 lines
1.4 KiB
C
#include <stdio.h>
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#include <string.h>
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#include <sys/uio.h>
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#include "compiler.h"
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#include "string_utils.h"
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#include "utils.h"
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/// Report allocation failure without allocating memory
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void report_allocation_failure(const char *func, const char *file, unsigned int line) {
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// Since memory allocation failed, we try to print this error message without any
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// memory allocation. Since logging framework allocates memory (and might even
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// have not been initialized yet), so we can't use it.
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char buf[11];
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int llen = uitostr(line, buf);
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const char msg1[] = " has failed to allocate memory, ";
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const char msg2[] = ". Aborting...\n";
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const struct iovec v[] = {
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{.iov_base = (void *)func, .iov_len = strlen(func)},
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{.iov_base = "()", .iov_len = 2},
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{.iov_base = (void *)msg1, .iov_len = sizeof(msg1) - 1},
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{.iov_base = "at ", .iov_len = 3},
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{.iov_base = (void *)file, .iov_len = strlen(file)},
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{.iov_base = ":", .iov_len = 1},
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{.iov_base = buf, .iov_len = (size_t)llen},
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{.iov_base = (void *)msg2, .iov_len = sizeof(msg2) - 1},
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};
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writev(STDERR_FILENO, v, ARR_SIZE(v));
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abort();
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unreachable;
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}
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///
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/// Calculates next closest power of two of 32bit integer n
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/// ref: https://graphics.stanford.edu/~seander/bithacks.html#RoundUpPowerOf2
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///
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int next_power_of_two(int n)
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{
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n--;
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n |= n >> 1;
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n |= n >> 2;
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n |= n >> 4;
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n |= n >> 8;
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n |= n >> 16;
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n++;
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return n;
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}
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// vim: set noet sw=8 ts=8 :
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