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	tadd portable reallocarray - numtools - perform numerical operations on vectors…
	git clone git://src.adamsgaard.dk/numtools
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	---
	commit 3ff913401e46517fdf53d9e51ff330c0fb4bbda4
	parent 46e27e9ab6b642fc1ac57cda2e7eacb43956ee24
	Author: Anders Damsgaard <[email protected]>
	Date: Sat, 11 Sep 2021 20:57:35 +0200

	add portable reallocarray

	Diffstat:
	M Makefile \| 1 +
	M util.h \| 2 ++
	A xreallocarray.c \| 19 +++++++++++++++++++

	3 files changed, 22 insertions(+), 0 deletions(-)
	---
	diff --git a/Makefile b/Makefile
	t@@ -25,6 +25,7 @@ SRC =\
	COMPATSRC =\
	strnlen.c\
	strlcpy.c\
	+ xreallocarray.c\

	COMPATOBJ = ${COMPATSRC:.c=.o}

	diff --git a/util.h b/util.h
	t@@ -17,6 +17,8 @@ size_t strlcpy(char dst, const char src, size_t dsize);
	#undef strnlen
	size_t strnlen(const char *str, size_t maxlen);

	+void * xreallocarray(void *m, size_t n, size_t s);
	+
	size_t allocarr(double *arr, const char str, size_t maxlen);
	int scannextval(char *str, double val);
	void printarr(double *arr, size_t len);
	diff --git a/xreallocarray.c b/xreallocarray.c
	t@@ -0,0 +1,19 @@
	+#include <err.h>
	+#include <stdlib.h>
	+
	+void *
	+xreallocarray(void *m, size_t n, size_t s)
	+{
	+ void *nm;
	+
	+ if (n == 0 \|\| s == 0) {
	+ free(m);
	+ return NULL;
	+ }
	+ if (s && n > (size_t) - 1 / s)
	+ err(1, "realloc: overflow");
	+ if (!(nm = realloc(m, n * s)))
	+ err(1, "realloc");
	+
	+ return nm;
	+}