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111 lines
2.2 KiB
C
111 lines
2.2 KiB
C
#include "compat.h"
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#include "config.h"
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#include <assert.h>
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#ifndef HAVE_REALLOCARRAY
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# include <errno.h>
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#endif
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#include <stdlib.h>
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#include <stdio.h>
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#include <stdarg.h>
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#include <string.h>
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#ifndef HAVE_STRDUP
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char *strdup(const char *s) {
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size_t size = strlen(s) + 1;
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char *dup = malloc(size);
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if (dup) {
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memcpy(dup, s, size);
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}
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return dup;
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}
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#endif
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#ifndef HAVE_ASPRINTF
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int asprintf(char **strp, const char *fmt, ...) {
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va_list va;
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va_start(va, fmt);
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int ret = vasprintf(strp, fmt, va);
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va_end(va);
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return ret;
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}
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#endif
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#ifndef HAVE_VASPRINTF
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int vasprintf(char **strp, const char *fmt, va_list ap) {
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va_list va;
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va_copy(va, ap);
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int len = vsnprintf(NULL, 0, fmt, va);
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va_end(va);
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char *str = malloc(len + 1);
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if (!str) {
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return -1;
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}
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va_copy(va, ap);
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int len2 = vsnprintf(str, len + 1, fmt, va);
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(void) len2;
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assert(len == len2);
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va_end(va);
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*strp = str;
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return len;
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}
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#endif
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#if !defined(HAVE_NRAND48) || !defined(HAVE_JRAND48)
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#define SC_RAND48_MASK UINT64_C(0xFFFFFFFFFFFF) // 48 bits
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#define SC_RAND48_A UINT64_C(0x5DEECE66D)
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#define SC_RAND48_C 0xB
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static inline uint64_t rand_iter48(uint64_t x) {
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assert((x & ~SC_RAND48_MASK) == 0);
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return (x * SC_RAND48_A + SC_RAND48_C) & SC_RAND48_MASK;
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}
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static uint64_t rand_iter48_xsubi(unsigned short xsubi[3]) {
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uint64_t x = ((uint64_t) xsubi[0] << 32)
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| ((uint64_t) xsubi[1] << 16)
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| xsubi[2];
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x = rand_iter48(x);
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xsubi[0] = (x >> 32) & 0XFFFF;
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xsubi[1] = (x >> 16) & 0XFFFF;
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xsubi[2] = x & 0XFFFF;
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return x;
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}
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#ifndef HAVE_NRAND48
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long nrand48(unsigned short xsubi[3]) {
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// range [0, 2^31)
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return rand_iter48_xsubi(xsubi) >> 17;
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}
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#endif
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#ifndef HAVE_JRAND48
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long jrand48(unsigned short xsubi[3]) {
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// range [-2^31, 2^31)
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union {
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uint32_t u;
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int32_t i;
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} v;
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v.u = rand_iter48_xsubi(xsubi) >> 16;
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return v.i;
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}
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#endif
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#endif
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#ifndef HAVE_REALLOCARRAY
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void *reallocarray(void *ptr, size_t nmemb, size_t size) {
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size_t bytes;
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if (__builtin_mul_overflow(nmemb, size, &bytes)) {
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errno = ENOMEM;
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return NULL;
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}
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return realloc(ptr, bytes);
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}
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#endif
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