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27 lines
592 B
C
27 lines
592 B
C
#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#ifndef HAVE_REALLOCARRAY
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#include <errno.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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/* this is sqrt(SIZE_MAX+1), as s1*s2 <= SIZE_MAX
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* if both s1 < MUL_NO_OVERFLOW and s2 < MUL_NO_OVERFLOW
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*/
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#define MUL_NO_OVERFLOW (1UL << (sizeof(size_t) * 4))
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void *
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reallocarray(void *optr, size_t nmemb, size_t size)
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{
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if ((nmemb >= MUL_NO_OVERFLOW || size >= MUL_NO_OVERFLOW) &&
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nmemb > 0 && SIZE_MAX / nmemb < size) {
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errno = ENOMEM;
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return NULL;
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}
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return realloc(optr, size * nmemb);
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}
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#endif /*HAVE_REALLOCARRAY */
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